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CC Staff Report 09-08-2014CITY OF 7700 Market Boulevard PO Box 147 Chanhassen, MN 55317 Administration Phone: 952.227.1100 Fax: 952.227.1110 Building Inspections Phone: 952.227.1180 Fax: 952.227.1190 Engineering Phone: 952.227.1160 Fax: 952.227.1170 Finance Phone: 952.227.1140 Fax: 952.227.1110 Park & Recreation Phone: 952.227.1120 Fax: 952.227.1110 Recreation Center 2310 Coulter Boulevard Phone: 952.227.1400 Fax: 952.227.1404 Planning & Natural Resources Phone: 952.227.1130 Fax: 952.227.1110 Public Works 7901 Park Place Phone: 952.227.1300 Fax: 952.227.1310 Senior Center Phone: 952.2271125 Fax: 952.227.1110 Web Site www.ci.chanhassen.mn.us MEMORANDUM TO: Todd Gerhardt, City Manager FROM: Krista Spreiter, Natural Resources Technician DATE: September 8, 2014 l , . SUBJ: Lake Minnewashta Regional Park Improvements Project Wetland Alteration Permit and Wetland Replacement Plan Planning Case 2014 -23 PROPOSED MOTION "The Chanhassen Planning Commission recommends that City Council approve Wetland Alteration Permit #2014 -23 and WCA Permit Number 2014 -03 to impact .05 acres of wetland and the wetland replacement plan under MN Rules Chapter 8420 which utilizes the purchase of. 1 acres of wetland credit from bank #1375 for the purpose of the proposed Lake Minnewashta Regional Park Improvements Project; and authorize the Water Resources Coordinator to sign the joint water resource application for approval of wetland replacement as shown in plans dated July 22, 2014, subject to conditions within this staff report. And, Adoption of the attached Findings of Fact and Recommendation." City Council approval requires a simple majority vote. EXECUTIVE SUMMARY The Carver County Parks Department is requesting a wetland alteration permit for wetland impacts as a result of the proposed Lake Minnewashta Regional Park Improvements Project. This is a revision to the original application, dated July 24, 2014. The revision includes the addition of 806 square feet of impact to one additional wetland (Lake Minnewashta).The proposed project consists of reshaping and resurface of the current gravel surface access roads within the park to bituminous surface, tail realignment, and construction of a bypass lane and turnaround at the park entrance (see Figure 1 below). Construction for the proposed project is expected to begin in September, 2014, with substantial completion by October 31, 2015. The proposed project will result in impacts to three wetland basins, which will result in a total of .07 acres of permanent wetland impact. These impacts will be mitigated for by wetland credits from the Board of Soil and Water Resources Road Chanhassen is a Community for Life - Providing for Today and Planning for Tomorrow Todd Gerhardt Lake Minnewashta Regional Park Improvements Project WAP — Planning Case 2014 -23 September 8, 2014 Page 2 Replacement Program and the purchase of wetland banking credits from wetland bank #1375. The original application called for only .05 acres of impact. However, an addendum was submitted by the applicant on August 26, 2014, identifying additional impact to an additional wetland totaling 806 square feet. This addendum has been included in the application. PLANNING COMMISSION SUMMARY The Planning Commission held a Public Hearing on August 19, 2014 to review the wetland alteration permit for the proposed road improvement project. The commission voted seven to zero on a motion recommending approval of the wetland alteration permit and wetland replacement plan. No individuals spoke at the public hearing. RECOMMENDATION Staff recommends adoption of the following motion approving the Wetland Alteration Permit and Wetland Replacement Plan: "The Chanhassen Planning Commission recommends that City Council approve Wetland Alteration Permit #2014 -23 and WCA Permit Number 2014 -03 to impact .05 acres of wetland and the wetland replacement plan under MN Rules Chapter 8420 which utilizes the purchase of .1 acres of wetland credit from bank #1375 for the purpose of the proposed Lake Minnewashta Regional Park Improvements Project; and authorize the Water Resources Coordinator to sign the joint water resource application for approval of wetland replacement as shown in plans dated July 22, 2014, subject to conditions within this staff report. And, Adoption of the attached Findings of Fact and Recommendation." ATTACHMENTS 1. Planning Commission Staff Report Dated August 19, 2014. 2. Memo from WSB dated August 26, 2014. gAplan\2014 planning cases \2014 -23 minnewashta regional park wetland alteration permit \cc_ revised application \executive summary_1 0 _13_2014.docx CITY OF CHANHASSEN PC DATE: August 19, 2014 —D — 4D, CC DATE: September 8, 2014 REVIEW DEADLINE: September 16, 2014 CASE #: 2014 -23 BY: KS PROPOSED MOTION: The Chanhassen Planning Commission recommends that City Council approve Wetland Alteration Permit #2014 -23 and WCA Permit Number 2014 -03 to impact .05 acres of wetland and the wetland replacement plan under MN Rules Chapter 8420 which utilizes the purchase of .1 acres of wetland credit from bank #1375 for the purpose of the proposed Lake Minnewashta Regional Park Improvements Project; and authorize the Water Resources Coordinator to sign the joint water resource application for approval of wetland replacement as shown in plans dated July 22, 2014, subject to conditions within this staff report. And, I/ Adoption of the attached Findings of Fact and Recommendation. SUMMARY OF REQUEST: Request for a Wetland Alteration Permit for the proposed Lake Minnewashta Regional Park Improvements Project. LOCATION: Within the Lake Minnewashta Regional Park, 6900 Hazeltine Boulevard, Section 4, T116 N, R23W, within the city of Chanhassen. APPLICANT: Carver County Parks Department Attn: Martin Walsh 11360 Highway 212 West Cologne, MN 55322 mwal shgco. carver.mn.us 952- 466 -5252 PRESENT ZONING: 2030 LAND USE PLAN: Rural Residential District (RR). Parks and Open Space. ACREAGE: N/A DENSITY: N/A SUMMARY OF PROPOSAL Request for a Wetland Alteration Permit under Chanhassen City Code, Chapter 20, Article VI, Wetland Protection, and approval of a wetland replacement plan under the MN Wetland Conservation Act for the Lake Minnewashta Regional Park Improvements Project. SCANNED Planning Commission Lake Minnewashta Regional Park Improvements Project Wetland Alteration Permit Planning Case #2014 -23 August 19, 2014 Page 2 of 17 LEVEL OF CITY DISCRETION IN DECISION -MAKING The City has limited discretion in approving or denying a wetland alteration permit, based on whether or not the proposal meets the wetland alteration permit standards outlined in the Zoning Ordinance. If the City finds that all the applicable wetland alteration permit standards are met, the permit must be approved. This is a quasi-judicial decision. APPLICABLE REGUATIONS • Chapter 20, Article IV, Conditional Uses: Wetland Alteration Permits follow the Conditional Use Permit criteria • Chapter 20, Article VI, Wetland Protection • MN Rules Chapter 8420.0500 through 8420.0526 PROPOSAL SUMMARY The Carver County Parks Department is requesting a wetland alteration permit for wetland impacts as a result of the proposed Lake Minnewashta Regional Park Improvements Project. The proposed project consists of reshaping and paving 5,657 lineal feet of a current road section, resurface of the access road to the dog park (1,587 lineal feet) boat launch improvements, 500 lineal feet of trail improvements and realignment, and construction of an entrance turnaround. (See Figure 1, below). Construction for the proposed project is expected to begin September 1, 2014, with substantial completion by October 31, 2015. Planning Commission Lake Minnewashta Regional Park Improvements Project Wetland Alteration Permit Planning Case #2014-23 August 19, 2014 Page 3 of 17 Figure 1. Proiect Location Lake Minnewashta Regional Park Improvements Project Carver County, Minnesota ----------------- USa. lnMp, IPC. NRCM, EW JOPM, C �i4,n XDA2). EGO [That" "". 2013 Figure 1. Project Location Lenend Lake Minnewashta Regional Park C3prqect t n CRY LMI Chanhassen, Minnesota FM-1 �e MlnlewaMa IM -2.000 Figure 1. Proiect Location Lake Minnewashta Regional Park Improvements Project Carver County, Minnesota Planning Commission Lake Minnewashta Regional Park Improvements Project Wetland Alteration Permit Planning Case #2014 -23 August 19, 2014 Page 4 of 17 In order to accommodate the project, the applicant is proposing to impact two existing wetlands (Wetlands G and H), as shown in Figure 2, below. i Aquatic Resource Type (wetland, lake, tributary etc-) X Duration of impart Permane -it (P) or iernpor aev III! Overall Size of Size of Impact'' Aquatic Resource E Existing Plant community Ry pact Alas Impact A•ea County, Major eed a, and Bank Service Area a of Impact Area G (W10) Wetland fill Fill F F ._. 979 sf 9.9 sr 1212s-' 5661 sf Wet meadow Wet Meadow Carver, 26, 7 Carver, M. 7 H W21) Wedand it /^` ^` \ M.." Ww.cr � LF / •1 y Fo 1 {� 14 wFlux°Iw,cr KLiI/JyxE6i il°H ItIM T � Sy •%.� ..�..v• .' � �ii xEruwx —� I n . • mn our � s _ amn Figure 2. Proposed wetland impacts as indicated in plans from application, dated July 22, 2014. Table 1. Wetland Impacts Aquatic Resource ID jas meted on overhead vlewl Aquatic Resource Type (wetland, lake, tributary etc-) Type of Irapact #ill. eacavate, drain, or remove vegetation) Duration of impart Permane -it (P) or iernpor aev III! Overall Size of Size of Impact'' Aquatic Resource E Existing Plant community Ry pact Alas Impact A•ea County, Major eed a, and Bank Service Area a of Impact Area G (W10) Wetland fill Fill F F ._. 979 sf 9.9 sr 1212s-' 5661 sf Wet meadow Wet Meadow Carver, 26, 7 Carver, M. 7 H W21) Wedand Joint Water Resource Permit Application for the Lake Minnewashta Regional Park Project, prepared by WSB & Associates, Inc., February 21, 2014 Planning Commission Lake Minnewashta Regional Park Improvements Project Wetland Alteration Permit Planning Case #2014 -23 August 19, 2014 Page 5 of 17 The proposed .05 acres of wetland impacts resulting from the park improvements are to be mitigated for using wetland bank credits purchased by Carver County from account #1375. This wetland bank is located in the same Bank Service Area (BSA 7) and Major Watershed (19 -South Fork, Crow R.) as the proposed project. Therefore, the impacts are required to be mitigated for at a 2:1 ratio, resulting in the purchase of .1 acres of wetland credit from bank #1375. This is consistent with Chapter 8420.0522 of the Wetland Conservation Act (WCA) Rules. BACKGROUND Carver County Parks has received grant funding from the State of Minnesota, through the Legacy Amendment, for the proposed improvements to Lake Minnewashta Regional Park with the purpose of improving public amenities within the park and providing safer access for the public. The park experiences over 147,400 visits throughout the year. Many of these users are recreationalists who utilize the park's two boat launches, as they provide the only public access to Lake Minnewashta. Lake Minnewashta Regional Park currently consists of 341 acres of forest, wetland, prairie, shoreline habitat, and developed parkland, and includes two boat accesses, 4 picnic shelters, a beach area, creative playground, 5 miles of trail and a fishing pier. All access roads within the park are currently gravel surfaced, including Scenic Drive, the main roadway through the park. The park's roadways have been experiencing unsafe conditions and erosion due to washouts, frost boils, and irregular road surfaces. Lake Minnewashta Regional Park has also at times experienced backups onto Highway 41 at the entrance of the park, creating unsafe conditions for motorists and users. The goal of the project is to improve safety and accessibility, and reduce erosion. Additional project information can be found in the memorandum, permit application, and its attachments dated July 22, 2014. The need for the project is also identified in the State Park Road Account Program grant application, and the Carver County's Park Master Plan. The proposed Lake Minnewashta Regional Park Improvements Project includes trail improvements, roadway improvements, access road improvements, boat launch improvements and expansion, and construction of an entrance turnaround. The project will disturb a total of 10.37 acres of land, and increase the existing impervious surface within the park by .45 acres. Trail improvements include construction of a new bituminous trail as part of the trail realignment, as well as demarcation of a cross- country skiing trail. The road improvements include resurfacing the current gravel surface roadway to a 22 -foot wide rural bituminous surface with gravel shoulders. This includes the access road to the dog park, and the creation of a 250 -foot bypass lane at the park entrance. The proposed project also includes the reconstruction and expansion of an existing boat launch to accommodate additional boat traffic at this location. The boat launch area currently consists of 10 parking stalls. The proposed boat launch area would be expanded to accommodate 45 vehicles. The existing boat launch is currently in need of repair, and the applicant sought to design the boat launch to meet Minnesota Department of Natural Resources (DNR) requirements. As a result, the boat launch does not require a MN DNR permit. Planning Commission Lake Minnewashta Regional Park Improvements Project Wetland Alteration Permit Planning Case #2014 -23 August 19, 2014 Page 6of17 Figure 3. Proposed Lake Minnewashta Regional Park Improvements Project as indicated in plans from application, dated July 22, 2014. s M. i V/l 1 j. ` s! f �I Figure 3. Proposed Lake Minnewashta Regional Park Improvements Project as indicated in plans from application, dated July 22, 2014. Figure 4. Proposed Lake Minnewashta Regional Park Improvements Project as indicated in plans from application, dated July 22, 2014. s M. V/l 1 j. ` s! Figure 4. Proposed Lake Minnewashta Regional Park Improvements Project as indicated in plans from application, dated July 22, 2014. Planning Commission Lake Minnewashta Regional Park Improvements Project Wetland Alteration Permit Planning Case #2014 -23 August 19, 2014 Page 7of17 Figure 5. Proposed Lake Minnewashta Regional Park Improvements Project as indicated in plans from application, dated July 22, 2014. Wetlands within the proposed project area were delineated in September of 2013 by WSB & Associates, Inc. The delineations were reviewed on site by city staff in October of 2013, and the boundary was approved by the City of Chanhassen on July 24, 2014. The delineation identified four wetland areas within the proposed project areas. The Joint Permit Application for wetland replacement dated July 22, 2014, was received and noticed on July 24, 2014. The proposed improvements will result in permanent impacts to two wetlands, shown in Figure 6 below, and described as follows: Wetland G: Wetland G is classified as a type 2, fresh (wet) meadow wetland according to Fish and Wildlife Service Circular 39. This wetland is not yet classified under the City's wetland inventory. Wetland G is located immediately south and east of the existing boat launch and entirely within the project area for the proposed boat launch. This wetland would be eliminated as part of the proposed project. The proposed impact to this wetland is approximately 979 square feet. Wetland H: Wetland H is also classified as a type 2, fresh (wet) meadow wetland according to Fish and Wildlife Service Circular 39. This wetland is not yet classified under the City's wetland inventory. Wetland H is located just south of the existing boat launch. The proposed impact to this wetland would result from the trail removal and realignment proposed with the � X � m � WEEER J F i Figure 5. Proposed Lake Minnewashta Regional Park Improvements Project as indicated in plans from application, dated July 22, 2014. Wetlands within the proposed project area were delineated in September of 2013 by WSB & Associates, Inc. The delineations were reviewed on site by city staff in October of 2013, and the boundary was approved by the City of Chanhassen on July 24, 2014. The delineation identified four wetland areas within the proposed project areas. The Joint Permit Application for wetland replacement dated July 22, 2014, was received and noticed on July 24, 2014. The proposed improvements will result in permanent impacts to two wetlands, shown in Figure 6 below, and described as follows: Wetland G: Wetland G is classified as a type 2, fresh (wet) meadow wetland according to Fish and Wildlife Service Circular 39. This wetland is not yet classified under the City's wetland inventory. Wetland G is located immediately south and east of the existing boat launch and entirely within the project area for the proposed boat launch. This wetland would be eliminated as part of the proposed project. The proposed impact to this wetland is approximately 979 square feet. Wetland H: Wetland H is also classified as a type 2, fresh (wet) meadow wetland according to Fish and Wildlife Service Circular 39. This wetland is not yet classified under the City's wetland inventory. Wetland H is located just south of the existing boat launch. The proposed impact to this wetland would result from the trail removal and realignment proposed with the Planning Commission Lake Minnewashta Regional Park Improvements Project Wetland Alteration Permit Planning Case #2014 -23 August 19, 2014 Page 8of17 reconstruction of the boat launch area. The proposed impact to this wetland is approximately 1,212 square feet. Figure 6. Proposed wetland impacts as indicated in plans from application, dated July 22, 2014. WETLAND BUFFERS The applicant has chosen to meet The Minnehaha Creek Watershed District (MCWD) Wetland Protection Rule. This rule is more stringent than the City's Wetland Protection Ordinance; therefore, the proposed plan brought forth by the applicant also meets the requirements of the City's Wetland Protection Ordinance by default. The MCWD requires that any project that activates the MCWD's Wetland Protection or Stormwater Rule, such as this one, provide a buffer `on that part of the wetland edge that is down - gradient from the activity of construction and around each wetland that will be disturbed' - MCWD Wetland Protection Rule, 5.(a). As a result, a buffer will be created for five wetlands associated with the project, according to the District's wetland assessment and buffer width requirements. These wetlands, and their corresponding classifications and buffer requirements set forth by the District, are shown in Table 2, below. X J .00 - x m ... -.� -. \• -` �`\ !y1t I wERUn win + 1. VIE w> : Is �na(MSF) � .,. ,.. ,♦. ♦� \ -,\ III +1yl� Figure 6. Proposed wetland impacts as indicated in plans from application, dated July 22, 2014. WETLAND BUFFERS The applicant has chosen to meet The Minnehaha Creek Watershed District (MCWD) Wetland Protection Rule. This rule is more stringent than the City's Wetland Protection Ordinance; therefore, the proposed plan brought forth by the applicant also meets the requirements of the City's Wetland Protection Ordinance by default. The MCWD requires that any project that activates the MCWD's Wetland Protection or Stormwater Rule, such as this one, provide a buffer `on that part of the wetland edge that is down - gradient from the activity of construction and around each wetland that will be disturbed' - MCWD Wetland Protection Rule, 5.(a). As a result, a buffer will be created for five wetlands associated with the project, according to the District's wetland assessment and buffer width requirements. These wetlands, and their corresponding classifications and buffer requirements set forth by the District, are shown in Table 2, below. Planning Commission Lake Minnewashta Regional Park Improvements Project Wetland Alteration Permit Planning Case #2014 -23 August 19, 2014 Page 9 of 17 Table 2. Wetland Buffers Wetland (SRF Wetland Management Watershed Required Provided delineation Type (at Classification District Buffer Width Buffer Width label in project (based on (max/min) in in feet parentheses) area) MCWD feet assessment) A 3 Manage 2 MCWD 30 / 16 3 -30 D 3 Preserve MCWD 75/67 0 E (W9) 6 Manage 1 MCWD MCVJD -40 10 -40 /34 F (W21) 6 Preserve i MCWD 1 75/67 3 -75 H (W22) 2 Manage 3 1 MCWD 120/16 0 -20 Joint Water Resource Permit Application far the Lake Minnewashta Regional Park Project, prepared by WSB & Associates, Inc., February 21, 2014 ALTERNATIVES The Wetland Conservation Act requires the applicant to list at least two alternatives to the proposed project that would avoid or minimize impacts to wetlands or waters (one of which may be "no build" or "do nothing "). The applicant then must list and explain why the option described in the application was chosen over these alternatives. The following alternatives were presented in the Joint Water Resource Application submitted by the applicant: Alternative road alignments were considered to avoid wetland impacts to the greatest extent practicable. Initial design of the road at the entrance to the park resulted in impacts to Wetland A. The design was changed to include a retaining wall in this location to completely avoid wetland impacts to this wetland. Road alignments were also designed to avoid impacts to Wetlands B, C, E, and F. Alternatives to impacts associated with the boat launch reconstruction included additional impacts to the wooded area north of the parking lot and completely realigning the road to the south. This was regarded as an impractical option, and would result in a loss of a large amount of woodland habitat, thus impacts to Wetland G were considered unavoidable. Wetland H is proposed to be impacted as a result of the trail relocation, just south and east of its current location. The existing trail currently bisects Wetland H. The proposed project will involve the removal of the existing trail and realigning the trail so that it skirts along the edge of Wetland H. Approximately 383 square feet of wetland area in Wetland H will be restored as a result of the trail removal. Credit is not being sought for this restoration activity; however, the applicant is asking that it be recognized as a minimization effort. Planning Commission Lake Minnewashta Regional Park Improvements Project Wetland Alteration Permit Planning Case #2014 -23 August 19, 2014 Page 10 of 17 Impact Minimization and Avoidance The Wetland Conservation Act requires that if avoidance is not an option, the unavoidable impacts are minimized to the greatest extent practicable. Efforts have been made by the applicant to minimize the proposed wetland impacts by restoration of wetland resulting in the realignment of the trail, as previously stated, as well as constructing the trail as close to grade as possible, to minimize impacts resulting from slopes. A retaining wall was also included in the final design, as previously discussed, to avoid impacts to Wetland A, and reduce the overall impacts of the proposed project. STORMWATER MANAGEMENT A series of infiltration basins and a stormwater pond are proposed within the proposed boat launch parking lot to provide water quality treatment for the additional .45 acres of impervious surface that is to be created as a result of the proposed project. The MCWD Stormwater management rule requires that phosphorous control and rate control be provided for the resulting net increase in impervious surface. Because the increase in impervious surface is almost solely due to the construction and expansion of the proposed boat launch, the stormwater treatment features that are to be installed are concentrated in this area (See Figures 7 and 8 below). These features will be designed to meet local and state water quality standards. P0i1or9 L01' CONCRETE PAD FOR PORTABLE RESTROOMS 45'x15' •-_ 'BOAT PREP\REA ./� `� •�� +•� BVEHICLE STALLS �!® � DOUBLE LAUNCH WITH '' LOADING DOCK �`�•� yl, RECYCLING �// \• \�j�,' 0. COMPOST /TRASH BIN AREA - WX1T- •/ �� t r o e Fu TIE DOWN' AREA 35 VEHICLE / TRAILER STALLS • _ 1 Figure 7. Grading and drainage plan as indicated in plans from application, dated July 22, 2014. Planning Commission Lake Minnewashta Regional Park Improvements Project Wetland Alteration Permit Planning Case #2014 -23 August 19, 2014 Page 11 of 17 Figure S. Drainage routing plan as indicated in plans from application, dated July 22, 2014. 0105 �+..y9��p++ CONCRETE PAD FOR PORTABLE RESTROOMS tDA AT PREPARE ,/%.•�3. �`�..a `.SVEHICLESTA" -_` • 9 i �'� .HUNCH WITH -� _ LADING DOCK RECVCIINGG COMPOST7TRASH `�„ - / - BIN AREA r 80'X 17' 'IE DOWN' AREA 35VEHICLEITRAUR STALLS �I w. Yio.xsae. Subca a link Routing Diagram for Boat Landing Pragaredby HP, P"MxI 77M 14 H11tDCADa 10DG Vr DM3 02012 HOOCAD.SWIA'ffie:Alndanc LtC Figure S. Drainage routing plan as indicated in plans from application, dated July 22, 2014. Planning Commission Lake Minnewashta Regional Park Improvements Project Wetland Alteration Permit Planning Case #2014 -23 August 19, 2014 Page 12 of 17 WETLAND REPLACEMENT Wetland replacement for this project will be accomplished using wetland bank credits. The replacement plan proposes that .1 acres (.05 ac at a 2:1 ratio) for the proposed Lake Minnewashta Regional Park Improvements Project be purchased by the County, using wetland bank credits from wetland bank account #1375, located in the same Bank Service Area 7, and Major Watershed 19 (South Fork - Crow River). OTHER AGENCIES The applicant is responsible for obtaining any permits or approvals from the appropriate regulatory agencies and compliance with their Conditions of Approval. FINDINGS The Planning Commission shall recommend a Wetland Alteration Permit and the Council shall issue such Wetland Alteration Permit only if it finds that: a. The proposed project will not be detrimental to or endanger the public health, safety, comfort, convenience or general welfare of the neighborhood or the city. FINDING: The proposed wetland impacts that will occur with the Lake Minnewashta Regional Park Improvements Project have not been found to pose danger to public health, safety, comfort, convenience or general welfare. The goal of the proposed project is to improve the amenities of the park for residents and recreationalists. b. The proposed project will be consistent with the objectives of the City's Comprehensive Plan and the Zoning chapter of the City Code. FINDING: The proposal is consistent with the objectives of the City's Comprehensive Plan and City Code. It complies with all City, State and Federal requirements. The boat launch improvements, road improvements, and trail construction will improve safety and ease congestion within the park and where the park entrance intersects with Highway 41. c. The proposed project will be designed, constructed, operated and maintained so to be compatible in appearance with the existing or intended character of the general vicinity and will not change the essential character of that area. FINDING: The appearance and character of the general vicinity will not change. The applicant has made a reasonable effort to minimize impacts to wetlands by using the best road and trail alignment to avoid impacts, as well as use of a retaining wall near Wetland A. The present and future zoning of the parcel will not change. It will remain compatible with and enhance the existing and intended character, use, and appearance of the area. Planning Commission Lake Minnewashta Regional Park Improvements Project Wetland Alteration Permit Planning Case #2014 -23 August 19, 2014 Page 13 of 17 d. The proposed project will not be hazardous or disturbing to existing or planned neighboring uses. FINDING: The surrounding uses are zoned for Residential Medium- Density, Residential Large -Lot, and Residential Low - Density. The wetland impacts proposed as a result of the project are not foreseen to cause hazards or disturbance to existing or planned neighboring uses. The proposed project is considered an enhancement to neighboring uses, as well as providing increased safety for residents and users. e. The proposed project will be served adequately by essential public facilities and services, including streets, police and fire protection, drainage structures, refuse disposal, water and sewer systems and schools; or will be served adequately by such facilities and services provided by the persons or agencies responsible for the establishment of the proposed use. FINDING: Any changes to drainage structures or additional drainage structures needed as a result of the proposed wetland impacts will be designed and constructed by the applicant's contracted consultant in compliance with City design standards. Proposed roadways and trails will be maintained by Carver County, and will be constructed entirely on regional park property. f. The proposed project will not create excessive requirements for public facilities and services and will not be detrimental to the economic welfare of the community. FINDING: The proposed wetland impacts associated with the Lake Minnewashta Regional Park Improvements Project will not create excessive need for public facilities and services. The park improvements project does not require additional services required by the City. In addition, the proposed roadway improvements, trail improvements, and boat launch improvements are foreseen as an enhancement to economic community welfare, by providing safety improvements and accessibility for residents and recreationalists. g. The proposed project will not involve uses, activities, processes, materials, equipment and conditions of operation that will be detrimental to any persons, property or the general welfare because of excessive production of traffic, noise, smoke, fumes, glare, odors, rodents, or trash. FINDING: The proposed wetland alterations are not expected to be detrimental to any persons, property or the general welfare. h. The proposed project will have vehicular approaches to the property which do not create traffic congestion or interfere with traffic or surrounding public thoroughfares. Planning Commission Lake Minnewashta Regional Park Improvements Project Wetland Alteration Permit Planning Case #2014 -23 August 19, 2014 Page 14 of 17 FINDING: The proposed wetland impacts will not create nor interfere with traffic and surrounding public thoroughfares. When completed, the proposed entrance and roadway improvements will result in eased congestion and will provide safer conditions for both pedestrian and vehicular traffic. i. The proposed project will not result in the destruction, loss or damage of solar access, natural, scenic or historic features of major significance. FINDING: The proposed wetland impacts associated with the project will have no impact on solar access, natural, scenic or historic features of major significance. The proposed project will be aesthetically compatible with the area. FINDING: The applicant has made a reasonable effort to minimize wetland impacts and retain aesthetical compatibility within the area. In addition, the proposed park improvements project will complement the area. k. The proposed project will not depreciate surrounding property values. FINDING: The proposed wetland impacts have been minimized to the greatest extent feasible, while still allowing for the park improvements project to occur. The proposed park improvements project will provide safety, greater access, and will be an asset to the surrounding properties. 1. The proposed project will meet standards prescribed for certain uses as provided in the City Code. 20 -410 (b) When a permit is issued allowing wetland alteration, the following standards shall be followed: (1) The alteration will not have a net adverse effect on the ecological and hydrological characteristics of remaining wetland. FINDING: The applicant must meet the included conditions for the proposed wetland impacts in order to avoid an adverse effect on the ecological and hydrological characteristics of remaining wetland, as well as the requirements and regulations set forth by Sections 20 -401 — 20 -421 of Chanhassen City Code. (2) It shall be located as to minimize the impact on vegetation. FINDING: Efforts have been made by the applicant to minimize the impact on wetlands and vegetation through a variety of measures, including minimizing impact to wooded areas Planning Commission Lake Minnewashta Regional Park Improvements Project Wetland Alteration Permit Planning Case #2014 -23 August 19, 2014 Page 15 of 17 surrounding the current boat launch and the creation of wetland buffers. (3) It shall not adversely change water flow. FINDING: The applicant must meet the included conditions for the proposed wetland impacts in order to avoid an adverse effect on the hydraulic and hydrological characteristics of remaining wetland. The applicant is also in the process of obtaining the necessary permits from the Minnehaha Creek Watershed District in order to meet the District's Stormwater Rule. (4) The size of the altered area shall be limited to the minimum required for the proposed action. FINDING: The applicant has made a reasonable effort to limit the proposed wetland impacts to the minimum amount required in order to complete the construction of the park improvements project. During construction the contractor is required to follow approved plans to limit alterations to the minimum the project necessitates. (5) The disposal of any excess material is prohibited within remaining wetland areas. FINDING: The applicant and their contractor are prohibited from disposing of excess material within remaining wetland areas as well as any other activities which may negatively impact the remaining wetland areas. (6) The disposal of any excess material shall include proper erosion control and nutrient retention measures. FINDING: The applicant and their contractor must submit a satisfactory erosion and sediment control plan, and comply with all applicable sections of Chanhassen City Code, the City's Surface Water Management Plan, and the Minnesota Pollution Control Agency (MPCA). The applicant has obtained a National Pollutant Discharge Elimination System Construction Stormwater Permit, effective 7/17/2014, from the MPCA for the proposed project. (7) Alterations to any wetland area are prohibited during waterfowl breeding season or fish spawning season, unless it is determined by the city that the wetland is not used for waterfowl breeding or fish spawning. Planning Commission Lake Minnewashta Regional Park Improvements Project Wetland Alteration Permit Planning Case #2014 -23 August 19, 2014 Page 16 of 17 FINDING: The applicant and their contractor are required to refrain from any wetland altering activity during waterfowl breeding and fish spawning season. (8) Alterations to wetland areas shall be mitigated in accordance with the requirements of this article if the activity results in a loss of wetland area and /or function and value of the wetland. FINDING: The applicant has submitted a replacement plan as part of the Joint Water Resource Permit Application for Wetland Replacement which was received on July 24, 2014. The applicant is proposing to replace the impacted area using wetland bank credits. The required replacement ratio is 2:1. This is consistent with Chapter 8420.0522. of the Wetland Conservation Act (WCA) Rules, and City Code, Chapter 20, Article VI. (9) Dedicated buffers in accordance with Sections 20 -411. FINDING: The applicant must comply with the City's Wetland Protection Ordinance. In order to accommodate the improvements, the plan proposes impacts to two wetlands, totaling .05 acres of permanent wetland impact. The applicant, Carver County, is proposing to replace the permanently impacted area resulting from the Lake Minnewashta Regional Park Improvements project using wetland bank credits from wetland bank #1375. The requirement in this case calls for a 2:1 replacement ratio. This is consistent with Chapter 8420.0522. of the Wetland Conservation Act (WCA) Rules. The applicant must receive the City's approval of a wetland replacement plan prior to any wetland impact occurring. RECOMMENDATION Staff recommends that the Planning Commission adopt the following motion: "The Chanhassen Planning Commission recommends that City Council approve Wetland Alteration Permit #2014 -23 and WCA Permit Number 2014 -03 to impact .05 acres of wetland and the wetland replacement plan under MN Rules Chapter 8420 which utilizes the purchase of .1 acres of wetland credit from bank #1375 for the purpose of the proposed Lake Minnewashta Regional Park Improvements Project; and authorize the Water Resources Coordinator to sign the joint water resource application for approval of wetland replacement as shown in plans dated July 22, 2014, subject to the following conditions: Planning Commission Lake Minnewashta Regional Park Improvements Project Wetland Alteration Permit Planning Case #2014 -23 August 19, 2014 Page 17 of 17 1. Wetland replacement shall occur in a manner consistent with the Minnesota Wetland Conservation Act (MR 8420). The applicant shall receive the City's approval of a wetland replacement plan prior to any wetland impact occurring. 2. Wetland buffer areas shall be preserved, maintained, and/or created around all existing wetlands in compliance with Sections 20 -401 — 20 -421 of Chanhassen City Code. The applicant shall apply for and obtain permits from the appropriate regulatory agencies, e.g. Minnesota Pollution Control Agency, Minnesota Department of Natural Resources, Minnesota Department of Transportation, Minnesota Board of Soil and Water Resources and Army Corps of Engineers and comply with their conditions of approval. 4. The applicant must submit a Bill of Sale for Wetland Banking Credits to the Minnesota Board of Water and Soil Resources signed by both the buyer and seller of designated wetland credits. 5. The applicant must obtain, and the City must have received copy of, an Application for Withdrawal of Wetland Credits from the Minnesota Wetland Bank signed and approved by the Minnesota Board of Water and Soil Resources prior to any wetland impacts. 6. A signed Landowner Statement and Contractor Responsibility form shall be provided to City prior to commencement of activity. ATTACHMENTS 1. Findings of Fact and Recommendation. 2. Development Review Application. 3. Joint Water Resource Application for Wetland Replacement and Attachments 4. Affidavit of Mailing of Public Hearing Notice. GAPLAN\2014 Planning Cases\2014 -23 Minnewashta Regional Park WAP CITY OF CHANHASSEN CARVER COUNTY, MINNESOTA FINDINGS OF FACT AND RECOMMENDATION IN RE: The application of the Carver County Parks Department for a Wetland Alteration Permit for wetland replacement for proposed impacts to two wetlands, totaling .05 acres, as a part of the proposed Lake Minnewashta Regional Park Improvements Project — Planning Case 2014 -23. On August 19, 2014, the Chanhassen Planning Commission met at its regularly scheduled meeting to consider the application of Carver County for a wetland alteration permit to impact two wetlands. The total area proposed to be impacted is .05 acres. The Planning Commission conducted a public hearing on the wetland alteration permit which was preceded by published notice. The Planning Commission heard testimony from all interested persons wishing to speak and now makes the following: FINDINGS OF FACT 1. The property is currently zoned Rural Residential (RR). 2. The property is guided in the Land Use Plan for Parks and Open Space. The proposed project is located within the within Lake Minnewashta Regional Park, 6900 Hazeltine Boulevard, Section 4, T116 N, R23W, within the city of Chanhassen. 4. City code directs that a wetland alteration permit shall not be issued without having been first reviewed by the Planning Commission and approved by the City Council following the review and hearing procedures set forth for conditional use permits and the additional requirement of Minnesota Rules Chapter 8420.0230. Wetland Alteration and Conditional Use Criteria: The Planning Commission shall recommend a Wetland Alteration Permit and the Council shall issue such Wetland Alteration Permit only if it finds that: a. The proposed project will not be detrimental to or endanger the public health, safety, comfort, convenience or general welfare of the neighborhood or the city. FINDING: The proposed wetland impacts that will occur with the Lake Minnewashta Regional Park Improvements Project have not been found to pose danger to public health, safety, comfort, convenience or general welfare. The goal of the proposed project is to improve the amenities of the park for residents and recreationalists. b. The proposed project will be consistent with the objectives of the City's Comprehensive Plan and the Zoning chapter of the City Code. FINDING: The proposal is consistent with the objectives of the City's Comprehensive Plan and City Code. It complies with all City, State and Federal requirements. The boat launch improvements, road improvements, and trail construction will improve safety and ease congestion within the park and where the park entrance intersects with T.H. 41. c. The proposed project will be designed, constructed, operated and maintained so to be compatible in appearance with the existing or intended character of the general vicinity and will not change the essential character of that area. FINDING: The appearance and character of the general vicinity will not change. The applicant has made a reasonable effort to minimize impacts to wetlands by using the best road and trail alignment to avoid impacts, as well as use of a retaining wall near Wetland A. The present and future zoning of the parcel will not change. It will remain compatible with and enhance the existing and intended character, use, and appearance of the area. d. The proposed project will not be hazardous or disturbing to existing or planned neighboring uses. FINDING: The surrounding uses are zoned for Residential Medium- Density, Residential Large -Lot, and Residential Low- Density. The wetland impacts proposed as a result of the project are not foreseen to cause hazards or disturbance to existing or planned neighboring uses. The proposed project is considered an enhancement to neighboring uses, as well as providing increased safety for residents and users. e. The proposed project will be served adequately by essential public facilities and services, including streets, police and fire protection, drainage structures, refuse disposal, water and sewer systems and schools; or will be served adequately by such facilities and services provided by the persons or agencies responsible for the establishment of the proposed use. FINDING: Any changes to drainage structures or additional drainage structures needed as a result of the proposed wetland impacts will be designed and constructed by the applicant's contracted consultant in compliance with City design standards. Proposed roadways and trails will be maintained by Carver County, and will be constructed entirely on regional park property. f. The proposed project will not create excessive requirements for public facilities and services and will not be detrimental to the economic welfare of the community. FINDING: The proposed wetland impacts associated with the Lake Minnewashta Regional Park Improvements Project will not create excessive need for public facilities and services. The park improvements project does not require additional services required by the City. In addition, the proposed roadway improvements, trail improvements, and boat launch improvements are foreseen as an enhancement to economic community welfare, by providing safety improvements and accessibility for residents and recreationalists. g. The proposed project will not involve uses, activities, processes, materials, equipment and conditions of operation that will be detrimental to any persons, property or the general welfare because of excessive production of traffic, noise, smoke, fumes, glare, odors, rodents, or trash. FINDING: The proposed wetland alterations are not expected to be detrimental to any persons, property or the general welfare. h. The proposed project will have vehicular approaches to the property which do not create traffic congestion or interfere with traffic or surrounding public thoroughfares. FINDING: The proposed wetland impacts will not create nor interfere with traffic and surrounding public thoroughfares. When completed, the proposed entrance and roadway improvements will result in eased congestion and will provide safer conditions for both pedestrian and vehicular traffic. i. The proposed project will not result in the destruction, loss or damage of solar access, natural, scenic or historic features of major significance. FINDING: The proposed wetland impacts associated with the project will have no impact on solar access, natural, scenic or historic features of major significance. j. The proposed project will be aesthetically compatible with the area. FINDING: The applicant has made a reasonable effort to minimize wetland impacts and retain aesthetical compatibility within the area. In addition, the proposed park improvements project will complement the area. k. The proposed project will not depreciate surrounding property values. FINDING: The proposed wetland impacts have been minimized to the greatest extent feasible, while still allowing for the park improvements project to occur. The proposed park improvements project will provide safety, greater access, and will be an asset to the surrounding properties. 1. The proposed project will meet standards prescribed for certain uses as provided in the City Code. 20 -410 (b) When a permit is issued allowing wetland alteration, the following standards shall be followed: (1) The alteration will not have a net adverse effect on the ecological and hydrological characteristics of remaining wetland. FINDING: The applicant must meet the included conditions for the proposed wetland impacts in order to avoid an adverse effect on the ecological and hydrological characteristics of remaining wetland, as well as the requirements and regulations set forth by Sections 20 -401 — 20 -421 of Chanhassen City Code. (2) It shall be located as to minimize the impact on vegetation. FINDING: Efforts have been made by the applicant to minimize the impact on wetlands and vegetation through a variety of measures, including minimizing impact to wooded areas surrounding the current boat launch and the creation of wetland buffers. (3) It shall not adversely change water flow. FINDING: The applicant must meet the included conditions for the proposed wetland impacts in order to avoid an adverse effect on the hydraulic and hydrological characteristics of remaining wetland. The applicant is also in the process of obtaining the necessary permits from the Minnehaha Creek Watershed District in order to meet the District's Stormwater Rule. (4) The size of the altered area shall be limited to the minimum required for the proposed action. FINDING: The applicant has made a reasonable effort to limit the proposed wetland impacts to the minimum amount required in order to complete the construction of the park improvements project. During construction the contractor is required to follow approved plans to limit alterations to the minimum the project necessitates. (5) The disposal of any excess material is prohibited within remaining wetland areas. FINDING: The applicant and their contractor are prohibited from disposing of excess material within remaining wetland areas as well as any other activities which may negatively impact the remaining wetland areas. (6) The disposal of any excess material shall include proper erosion control and nutrient retention measures. in FINDING: The applicant and their contractor must submit a satisfactory erosion and sediment control plan, and comply with all applicable sections of Chanhassen City Code, the City's Surface Water Management Plan, and the Minnesota Pollution Control Agency (MPCA). The applicant has obtained a National Pollutant Discharge Elimination System Construction Stormwater Permit, effective 7/17/2014, from the MPCA for the proposed project. (7) Alterations to any wetland area are prohibited during waterfowl breeding season or fish spawning season, unless it is determined by the city that the wetland is not used for waterfowl breeding or fish spawning. FINDING: The applicant and their contractor are required to refrain from any wetland altering activity during waterfowl breeding and fish spawning season. (8) Alterations to wetland areas shall be mitigated in accordance with the requirements of this article if the activity results in a loss of wetland area and/or function and value of the wetland. FINDING: The applicant has submitted a replacement plan as part of the Joint Water Resource Permit Application for Wetland Replacement which was received on July 24, 2014. The applicant is proposing to replace the impacted area using wetland bank credits. The required replacement ratio is 2:1. This is consistent with Chapter 8420.0522. of the Wetland Conservation Act (WCA) Rules, and City Code, Chapter 20, Article VI. (9) Dedicated buffers in accordance with Sections 20 -411. FINDING: The applicant must comply with the City's Wetland Protection Ordinance. The Planning Commission recommends that the City Council approve the application of Carver County for a Wetland Alteration Permit for wetland replacement for proposed impacts to two wetlands, totaling .05 acres, as a part of the proposed Lake Minnewashta Regional Park Improvements Project. ADOPTED by the Chanhassen Planning Commission this 19d' day of August, 2014. CHANHASSEN PLANNING COMMISSION F-W Its Chairman 0 RECEIVED COMMUNITY DEVELOPMENT DEPARTMENT Boulevard OF Mailing Address- P.O. Boxa147, Chanha sen, MN 593't7' cHANH CITY OF CHIHMSEN - 7700 Phone: (952) 227 -1300 / Fax: (952) 227 -1110 e APPLICATION FOR DEVELOPMENT REVIEW Date Filed:? t- I 60-09y Review Deadline: �w.r ck os+Q. -. S ceaa g: U i � —a3 ❑ Comprehensive Plan Amendment.. ....................... $600 ❑ Minor MUSA line for falling on -site sewers..... $100 ❑ Conditional Use Permit ❑ Single- Family Residence . ............................... $325 ❑ All Others .......................... ............................... $425 ❑ Interim Use Permit ❑ In conjunction with Single - Family Residence..$325 ❑ All Others .............................. ........................... $425 ❑ Grading t 1,000 cubic yards ........................... UBC ❑ Rezoning ❑ Planned Unit Development (PUD) .................. $750 ❑ Minor Amendment to existing PUD ..... - .......... $100 ❑ All Others .............................. ...........................$500 ❑ Sign Plan Review........ ......... ...................... ............ $150 ❑ Site Plan Review ❑ Administrative ....................... ...........................$100 ❑ Commercial /industrial Districts " ......................$500 Plus $10 per 1,000 square feet of building area *include number of existing employees: and number of nevi employeee: ❑ Residential Districts .......... ............................... $500 Plus $5 per dwelling unit ADDITIONAL REQUIRED FEES: ❑ Notification Sign.. .................................. ....... ...... $200 (City to install and remove) ❑ Property Owners' List within 500' ........ $3 per address (City to generate -fee determined at pre - application meeting) ❑ Escrow for Recording Documents.. $50 per document (CUPISPRNACIVARNOAP/Metes & Bounds Subdivision) Project N Property Parcel #: Total Acr ❑ Subdivision ❑ Create 3 lots or less ............. ........................... $300 ❑ Create over 3 lots .......................$600 + $15 per lot ❑ Metes & Bounds .........................$300 + $50 per lot ❑ Consolidate Lots.... ....... I ............... 1 ..... I ...... I ... $160 ❑ Lot Line Adjustment .............. ...........................$150 ❑ Final Pla r ............................. ...........................$250 •Requires additional $450 escrow for attorney costs. Escrow will be required for other applications through the developmentoomred. ❑ Vacation of Easements / Right -of- way ................... $300 (Additional recording ices may apply) ❑ Variance ..... ............................... ...........................$200 RL Welland Alteration Permit ❑ Single - Family Residence ............................... $150 [$ All Others ........................ ............................... $275 ❑ Zoning Appeal ....................... ............................... $100 ❑ Zoning Ordinance Amendment ............................ $500 MOTE: When multiple applications are processed concurrently, the appropriate fee shall be charged foreach application. (Refer to the appropriate Application Checklist for required submittal Information that must accompany this application) TOTAL FEES: $ WNIUEA Received from: Date Received: Check Number: Section 2: Required Inforinatio€1 Present Zoning: 7A�kS t OPRA/CePt,6 � 19. Requested Zoning: NO Gf(nA)6 -F, Present Land Use Designation: Freaks +` nPFA Requested Land Use Designation: NO Gf(R &,F Existing Use of Property: Rti_C710. LU, PXkrzK. Description of Proposal: PrODd57FP 1MPRDUEJYIStJWIS?0 MaJIJF1Jr7�Fi1r iZla[n2llllyii ?A9 +r -hFrYr ❑ Check box if separate narrative is attached A+mo V-NyT9^ k ' - up N APPLICANT OTHER THAN PROPERTY OWNER: In signing this application, I, as applicant, represent to have obtained authorization from the property owner to file this application. I agree to be bound by conditions of approval, subject only to the right to object at the hearings on the application or during the appeal period. If this application has not been signed by the property owner. I have attached separate documentation of full legal capacity to file the application. This application should be processed In my name and I am the party whom the City should contact regarding any matter pertaining to this application. I will keep myself informed of the deadlines for submission of material and the progress of this application. I further understand that additional fees may be charged for consulting fees, feasibility studies, etc, with an estimate prior to any authorization to proceed with the study. I certify that the information and exhibits submitted are true and correct. Name: Contact: Address: Phone: City/State /Zip: Cell: Email: Fax: Signature: Date: PROPERTY OWNER: In signing this application, I, as property owner, have full legal capacity to, and hereby do, authorize the filing of this application. I understand that conditions of approval are binding and agree to be bound by those conditions, subject only to the right to object at the hearings or during the appeal periods. I will keep myself informed of the deadlines for submission of material and the progress of this application. I further understand that additional fees may be charged for consulting fees, feasibility studies, etc. with an estimate prior to any authorization to proceed with the study. I certify that the information and exhibits submitted are true and correct. Name: _ l,lic.009— Cb0 r4T%4 PRt2t 6 Contact: Mttit.•tita Vr RL A Address: lZ-(Do ItAW4 21Z Cur 'd.. Phone: R52./�(ofD•5250 City /State/Zip: cot -O&Ne- , vw. 55,322— Cell Email: Signature: Fax: `i52 •`I to b. X223 Date: This application must be complete6 in full and be typewritten or clearly printed and must be accompanied by all Information and plans required by applicable City Ordinance provisions. Before filing this application, refer to the appropriate Application Checklist and confer with the Planning Department to determine the specific ordinance and applicable procedural requirements. A determination of completeness of the application shall be made within 15 business days of application submittal. A written notice of application deficiencies shall be mailed to the applicant within 15 business days of application. PROJECT ENGINEER (If applicable) Name: Contact: Address: Phone: City /State /Zip: Cell: Email: Fax: Who should receive copies of staff reports? *Other Contact Information: Property Owner Via: �y�r Email E3 Mailed Paper Copy Name: ❑ Applicant Via: 1J Email ❑ Mailed Paper Copy Address: ❑ Engineer Via: ❑ Email ❑ Mailed Paper Copy City/State/Zip: ❑ Other' Via: ❑ Email ❑ Mailed Paper Copy Email: SCANNED A WSB engineering- planning- environmental. construction 701 Xenia Avenue South Suite 300 Minneapolis, MN 55416 Tel: 763 -541 -4800 Fax: 763 -541 -1700 Memorandum To: Courtney Hall, Minnehaha Creek Watershed District Melissa Jenny, US Corps of Engineers Ben Meyer, BWSR Jennie Skancke, DNR Brooke Haworth, DNR Mike Wanous, Carver SWCD Terry Jeffery, City of Chanhassen Copy: Marty Walsh, Carver County Morgan Dawley, WSB & Associates From: Andi Moffatt, WSB & Associates Date: July 22, 2014 Re: Carver County Lake Minnewashta Regional Park Improvements Permit Application WSB Project No. 1945 -050 On behalf of Carver County, attached, please find a permit application and supporting documents for the Lake Minnewashta Regional Park Improvement Project. This application is for wetland impacts and watershed district approval. Project Description: Carver County Parks has received grant funding for proposed improvements to Lake Minnewashta Regional Park that incudes; road reshaping/paving (5657 linear feet), an access road to the dog park (15 87 linear feet), boat launch improvements, some trail improvements (500 linear feet realigned), and construction of an entrance turnaround. The purpose of this project is to improve the public amenities within the park as well as provide safer access along the road for the public. The project is within the Minnehaha Creek Watershed District (MCWD). The Riley- Purgatory Bluff Creek Watershed District (RPBCWD) has indicated the project is not within their boundaries. In total, the project will disturb 10.37 acres of land. The existing impervious surface is 6.04 acres and the proposed impervious is 6.49 acres for a net increase of 0.45 acres. This includes 500 linear feet of trail improvements, the reconstructed boat launch, reconstructed parking area for the boat launch, and entrance turnaround area. With the trail, new bituminous trail is being constructed as well as demarcation of a cross - country skiing trail. The road within the park will be resurfaced from gravel to bituminous and a bypass lane at the park entrance will be constructed. Equal Opportunity Employer wsbeng.mm K 0945 -0SOUMw,VemtiUN 0- 0]3310 -Agency BIlh B.,dcx July 22, 2014 Page 2 A previous delineation was completed in the Lake Minnewashta Regional Park by SRF Consulting Group and LGU approved in 2011. The 2011 wetland boundaries are shown on the project plans. Additional wetland was delineated by WSB in September 2013. A complete delineation report was submitted to the City of Chanhassen as the LGU for WCA on February 21, 2014. Attached with this application are the following appendices: Appendix A — Figures Appendix B — Plan set Appendix C — NPDES Permit Appendix D — Supporting Stormwater Management Analysis A discussion of how the project meets the MCWD rules is provided below. Wetlands and Buffers Wetlands have been avoided to the extent practical and the project anticipates 2191 sf (0.05 acres) of wetland impact. About 0.383 sf (0.009 acres) of trail will also be removed from a wetland. The attached wetland application addresses wetland sequencing. Wetland impacts are proposed to be mitigated by purchase of wetland credits, anticipated through the purchase of 0.1 acres from the Jeff Richards bank # 1375 in Carver County. The purchase agreement will be submitted under separate cover. The MCWD requires wetland buffers for projects that trigger the wetland or stormwater rule, as this project does. A buffer on public land, as is the case with this project, can be documented by written agreement with the District and the County. This is the County's preferred route. The buffer width is based on the District's wetland assessment. Based on this assessment, the wetlands have the following classifications and resulting buffer widths and are shown on the attached plans in Appendix A. Wetland (SRF Wetland Management Watershed Required Provided delineation Type (at Classification District Buffer Width Buffer Width label in project (based on (max/min) in in feet parentheses) area) MCWD feet assessment) A 3 Manage 2 MCWD 30/16 3 -30 D 3 Preserve MCWD 75/67 0 Y(W9) 6 Manage 1 MCWD MCWD — 40 10 -40 /34 F W21) 6 Preserve MCWD 75/67 3 -75 H (W22) 2 Manage 3 MCWD 20/16 0 -20 Erosion Control Plans The construction plans attached include erosion control and turf establishment plans as Sheet 20 -23. The SWPPP is in Sheets 24 -27. These plans meet the requirements of the erosion control rule. The plans include bioroils, silt fence, rock check entrance, and seeding. Receiving x M"s OMW�T u 0- 0nv4 - Ag®cyeypliuti docx July 22, 2014 Page 3 waters include surrounding small wetlands and ultimately Lake Minnewashta. A copy of the NPDES permit is also attached. Stormwater Management As stated, this project involves paving approximately 1 -mile of the existing gravel entrance road from Hazeltine Boulevard into Lake Minnewashta Regional Park. Additionally, the existing gravel boat launch parking lots (Appendix D) will be removed. The southerly lot will be replaced with an expanded parking lot and new boat launch (see plan set in Appendix B). Existing conditions land use is park land. Drainage patterns will not change from existing. • The total project area is 10.37 acres • Existing impervious surfaces in MCWD (including gravel) = 6.04 acres • Proposed impervious surfaces in MCWD = 6.49 acres • hncrease in impervious surfaces in MC" = 0.45 acres Based MCWD Stormwater Management Rule Table 5 the project is required to provide phosphorus control and rate control for the net increase in impervious surfaces. The increase in impervious is entirely due to the proposed boat launch parking lot; therefore BMPs have been focused in this location. Rate Control: MCWD requires that applicants demonstrate that their discharge rates have not increased from the pre - development for the 1 -year, 10 -year, and 100 -year critical storm events. There is no increase in impervious surfaces for the proposed entrance road and therefore no change in discharge rate. The existing culverts are proposed to be replaced in -kind. The existing and proposed discharge rates to Lake Minnewashta from the proposed boat launch parking lot are listed in Table 1. Table 1: Discharge Rate Comparison *Includes overflow over Brockton Road. The proposed discharge rates are less than or equal to existing for all storm events. See attached HydroCAD output for detailed results in Appendix D. Water Quality: MCWD requires phosphorus loadings for post - development to be less than or equal to existing phosphorus levels. P8 modeling was used to evaluate the water quality treatment of the proposed BMPs. Pre - development TP load = 9.5 lb /yr Post - development TP load = 0.5 lb /yr x: M94SOMW =Temi1sV.@M0 - OR314-ngmcy aWllution.aoa 2 -Year 10 -Year 100 - (CFS) (CFS) Year* (CFS) Existing 1.0 4.9 12.6 Proposed 1.9 6.8 7.4 *Includes overflow over Brockton Road. The proposed discharge rates are less than or equal to existing for all storm events. See attached HydroCAD output for detailed results in Appendix D. Water Quality: MCWD requires phosphorus loadings for post - development to be less than or equal to existing phosphorus levels. P8 modeling was used to evaluate the water quality treatment of the proposed BMPs. Pre - development TP load = 9.5 lb /yr Post - development TP load = 0.5 lb /yr x: M94SOMW =Temi1sV.@M0 - OR314-ngmcy aWllution.aoa July 22, 2014 Page 4 A series of infiltration basins and a pond are proposed within the boat launch parking lot to provide water quality treatment. Supporting Documentation: The documents provided with this memo for review are: • Drainage Maps — Appendix D • HydroCAD Results — Appendix D • P8 results —Appendix D • Plan Set — Appendix B Floodnlain FEMA floodplain elevation is 945.0. The OHW is 944.5. The existing boat launch will be reconstructed to accommodate better public access in this area. Currently, the boat launch has limited capacity and one launch area. The proposed launch will be reconstructed in the current location and include a double launch. The boat launch will be constructed to meet the DNR's Boat Ramp guidelines and as such, does not require a permit from the DNR. The design includes a double launch with concrete planks. The launch will extend from the upland side at elevation 946.3 into the water to elevation 943.93 as shown on the plans. The boat launch will result in 35 cy of fill in the floodplain. Based on the size of the basin, this will not increase the floodplain elevation of the lake. Proiect Timing: The project is anticipated to start September 1, 2014 and be completed October 31, 2015. Permit Request: On behalf of the City, we are requesting a permit from the MCWD, approval from the LGU for the WCA, and approval from the COE under Section 404. If you have any questions or need additional information, please feel free to call me at 763- 287 -7196. KV9< 3- OSOIAdmixTmni15U1EM0- OR]14 -A6mcy ap Hl dm dp x Print Form WATER RESOURCE PERMIT APPLICATION FORM Use this form to notify /apply to the Mirmehaha Creek Watershed District (MCWD) of a proposed project or work which may fall within their jurisdiction. Fill out this form completely and submit with your site plan, maps, etc. to the MCWD at: 15320 Minnetonka Blvd. Minnetonka, MN 55345. Keep a copy for your records. YOU MUST OBTAIN ALL REQUIRED AUTHORIZATIONS BEFORE BEGINNING WORK. 1. Name of each property owner: Wn Mailing Address: O w City. Ca D f>� State: Zip: •r.TiZz Email Address: w Phoneg,SL4/ Fax: 2. Property Owner Representative Information (not required) (licensed contractor, architect, engineer, etc...) Business Name: k6b Representative Name: Avidl A-4 4-t Business Address`L0J &niOt Side. -5l.it O( City: State: Aw Zip;_)" Z//(Q Email Address: Arno a44& W%bg". M r- Phone: `l -2 [ %-'2 Sto Fax: 3. Project Address: 1 tVt' <C City: LG�tG JGCr t State: MN Zip: 33I QtrSection(s): Section(s): Township(s): illrN Range(s): t� Lot: Block: - Subdivision: PID: 4. Size of project parcel (square feet or acres): Area of disturbance (square feet): 10,M at olttme of excavation/f)1(cubic yards): 35 Area of existing impervious surface: (d.0ti Area of proposed impervious surface: Jo, q-1 Length of shoreline affected (feet): YIQ Waterbody (& bay if applicable): Lai L# MiNVVeLa1t3bt'k- 5. Type of permit being applied for (Check all that apply): jf EROSION CONTROL ❑ WATERBODY CROSSINGS /STRUCTURES P( FLOODPLAIN ALTERATION j8: STORMWATER MANAGEMENT A WETLAND PROTECTION ❑ APPROPRIATIONS • DREDGING ❑ ILLICIT DISCHARGE • SHORELOUSTREAMBANK STABILIZATION 6. Project purpose (Check all that apply): ❑ SINGLE FAMILY HOME ❑ MULTIFAMILY RESIDENTIAL (apartments) 0 ROAD CONSTRUCTION ❑ COMMERCIAL or INSTrrUTIONAL O UTILITIES ❑ SU13DIVISIONS (include number of lots) ❑ DREDGING 0 LANDSCAPING (pools, berms, etc.) ❑ SHORELINE /STREAMBANKSTABI.IZATION ❑ OTHER (DESCRIBE): 7. NPDES /SDS General Stormwater Permit Number (if applicable): 1000 8. Waterbody receiving runoff from site: 9. Project Timeline: Start Date: L Completion Date: QL.;bV4AS[12V6 Permits have been applied for: City County 0 MN Pollution Contml Agency NR [3 COE Permits have been received: City _ County ::n MN Pollution Control Agency DNR__0 COE By signing below, I hereby request a permit to authorize the activities described herein. I certify that I am familiar with MCWD Rules and that the proposed activity will be conducted in compliance with these Rules. l am familiar with the Information contained in this application and, to the best of my knowledge and belief, all information Is true, complete and accurate. I understand that proceeding with work before all required authorizations are obtained may be subject to federal, state and/or local ad stnsQve 0ivil and/or criminal penalties. /j/f) / i L /c(1, ,Sjgnmunikof Each Property Owner Date Revised 7 /15/13 Page I of I Joint Application Form for Activities Affecting Water Resources In Minnesota This joint application form is the accepted means for initiating review of proposals that may affect a water resource (wetland, tributary, lake, etc) in the State of Minnesota understate and federal regulatory programs. Applicants for Minnesota Department of Natural Resources (DNR) Public Waters permits MUST use the MPARS online permitting system for submitting applications to the DNR. Applicants can use the information entered into MPARS to suhstitute for completing parts of this joint application form (see the paragraph on MPARS at the end of the joint application form Instructions for additional information). This form is only applicable to the water resource aspects of proposed projects under state and federal regulatory programs; other local applications and approvals may be requ'red. Depending on the nature of the project and the location and type of water resources impacted, multiple authorizations may be required as different regulatory programs have different types of jurisdiction over different types of resources. Regulatory Review Structure Federal The St. Paul District of the U.S. Army Corps of Engineers fCorpsl is the federal agency that regulates discharges of dredged or fill material into waters of the United States Iwet ands, tributaries, lakes, etc.) under Section 404 of the Clean Water Act (CWA) and regulates work In navigable waters under Section 10 of the Rivers and Harbors Act. Applications are assigned to Corps project managers who are responsible for implementing the Corps regulatory program within a particular gaographic area. State There are three state regulatory programs that regulate activities affecting water resources. The Wetland Conservation Act (WCA) regulates most activities affecting wetlands. R is administered by local government units (LGUs) which can be counties, townships, cities, watershed districts, watershed management organizations or state agencies Ion state-owned land). The Minnesota DNR Division of Ecological ane Water Resources issues permits for work in specially- designated public waters via the Public Waters Work Permit Program (DNR Public Waters Permits). The Minnesota Pollution Control Agency (MPCA) under Section 401 of the Clean Water Act certifies that discharges of dredged or fill material authorized by a federal permit or license comply with state water quality standards. One or more of these regulatory programs may be applicable to any one project. Required Information Prior to submitting an application, applicants are strorudv encouraged to seek input from the Corps Project Manager and LGU staff to identify regulatory Issues and required application materials for their proposed project. Project proponents can request a pre- application consultation with the Cc, and LGU to discuss their proposed project by providing the Information required in Sections 1 through 5 of this joint application form to facilitate a meaningfu discussion about their project. Many LGUs provide a venue (such as regularly scheduled technical evaluation panel meetings) for potential applicants to discuss their projects with multiple agencies priorto submitting an application. Contact Information is provided below. The following bullets outline the intormatlon generally required for several common types of determinations /authorizations. • Fordel'neation approvals and /or jurisdictional determinations, submit parts 1, 2 and 5, and Attachment A. • For acUvftiesinvolving CWA/WCA exemptions, WCA no -loss determinations, and activities not requiring mitigation, submit Parts 1 through 5, and Attachment B. For activities requiring compensatory mitigation /replacement plan, submit Parts 1 thru 5, and Attachments C and D. • For local road authority activities that quality for the state's local road wetland replacement program, submit Parts 1 through 5, and Attachments C, D (if applicable), and E to both the Corps and the LGU. Mlnnesota Interagency Water Resource Application Form February 2014 Page 1 of 13 Submission Instructions Send the completed joint application form and all required attachments to: U.5 Army Corps of Engineers. Applications maybe sent directly to the appropriate Corps Office. For a current listing of areas of responsibilities and contact information, visit the St. Paul District's webslte at: htto: J( www. myp. usace. ar+ nv.mi� /M�sslonstRezufatarv.asnx and select "Minnesota" from the contact Information box. Alternatively, applications maybe sent directly to the St. Paul District Headquarters and the Corps will forward them to the appropriate field office. Section 401 Water Quality Certification: Applicants do not need to submit the joint application form to the MPCA unless specifically requested. The MPCA will request a copy of the completed jolrt application form directly from an aloolicant when they determine an individual 401 water quality certification is required for a proposed project. Wetland Conservation Act Local Government Unit: Send to the appropriate Local Government Unit. If necessary, contact your county Soil and Water Conservation District (SW CO) office or visit the Board of Water and Soil Resources (BWSR) web site (www.bwsr.state.mn.us) to determine the appropriate LGU. DNR Public Waters Permitting: In 2014 the DNR will begin using the Minnesota DNR Permitting and Reporting System (MPARS) for submission of Public Waters permit applications (httcs: / /webaopsll.dnr. state. mn. us/ mpars /publiclauthenticationliogin). Applicants for Public Waters permits MUST use the MPARS online permitting system for submitting applications to the DNR. To avoid duplication and to streamline the application process among the various resource agencies, applicants can use the information entered Into MPARS tosubstitute for completing parts of this joint application form. The MPARS print/save function will provide the applicant with a copy of the Public Waters permit application which, at a minimum, will satisfy Parts one and two of this joint application. For certain types of activities, the MPARS application may also provide all of the necessary information required under parts three and four of the joint application. However, it is the responsibility of the Applicant to make sure that the joint application contains all of the required! rformation, including identification of all aquatic resources impacted by the project {see Part four of the joint application). After confirming that the MPARS application contains all of the required information In Parts one and two the Applicant may attach a copy to the joint application and fill in any missing information in the remainder of the joint application. Minnesota Interagency Water Resource Application Form February 2014 Page 2 of 13 Project Name and /or Number; PART ONE: Applicant Information If applicant is an entity (company, government entity, partnership, etc.), ar authorized contact person must be ieentiffed. If the applicant is using an agent (consultant, lawyer, or other third party) and has authorized them to act on their behalf, the agent's contact information must also be provided. Applicant/Landowner Name; Marty Walsh, Carver County Mailing Address: 11360 Hwy 212 West, Cologne, MN 55322 Phone: 952.466.5252 E -mail Address: mwaish @co.carver.mn.us Authorized Contact (do not complete if some as above): Same as above MailingAddress: Phone: E -mail Address: Agent Name: W58 & Associates —Andl Moffatt Mailing Address: 701 Xenia Ave —Suite 300, Mpls, MN 55416 Phone: 763 -287 -7196 E -mail Address: amoffett @wsbeng.com PART TWO: Site Location Information County: Carver Chy/Township: Chanhassen Parcel IDand /or Address: Lake Minnewashte Regional Park Legal Description (Section, Township, Range): Section 4, Twp 116N, R23W Lat/I.ong (decimal degrees): Attach a map showing the location of the site in relation to local streets, roads, highways. See attached figures Approximate site of site (acres) or If a linear project, length (feet): 7,244 linear feet If you know that your proposal will require an individual Permit from the U.S. Army Corps of Engineers, you must provide the names and addresses of all property owners adjacent to the project site. This information maybe provided by attaching a list to your application or by using block 25 of the Application for Department of the Army permitwhich can be obtained at: htti3:1/www.mvg,usaCE. army. mil/Pcrlais /57i dews/ reg ullatory /Rexulata!y,Docs /eny.form 4345 2012oct.odf PART THREE: General Project /Site information If this application is related to a delineation approval, exemption determination, jurisdictional determination, or other correspondence submitted prior to this application then describe that here and provide the Corps of Engineers project number. Describe the project that is being proposed, the project purpose and need, and schedule for implementation and completion. The project description must ful y describe the nature and scope of the proposed activity including a description of all project elements that effect aquatic resources (wetland, lake, tributary, etc.) and must also Include plans and cross section or profile drawings showing the location, character, and dimensions of all proposed activities and aquatic resource Impacts. Carver County Parks has received grant fending for proposed improvements to take Mimtewashta Regional Park that incudes, road reshaping /paving (5657 linear feetl, an access road to the dog park (1587 linear feet), boat launch improvements, some trail Improvements (500 linear feet realigned), and construction of an entrance turnaround. The purpose of this project is to improve the public amenities within the parkas well as Minnesota Interagency Water Resource Application Form February 2014 Page 3 of 13 provide safer access along the road for the public. In total, the project will disturb 1037 acres of land. The existing impervious surface is 6.04 acres and the proposed impervious is 8.49 acres for a net increase of 0.45 acres. This includes 500 linear feet of trail improvements, the reconstructed boat launch, and a reconstructed parking area forthe boat launch. With the trail, new bituminous trail is being constructed as well as demarcation of a cross-country skiing trail. The road within the park will be resurfaced from gravel to bituminous and a bypass lane at the park entrance will be constructed. A previous delineation was completed in the Lake Minnewashta Regional Park by SRF Consulting Group and LGU approved in 2011. The 2011 wetland boundaries ate shown on the project plans. Additional wetland was delineated by WSB in September 2013. A complete delineation report was submitted to the City of Chanhassen as the LGU for INCA on February 21, 2014. Wetlands have been avoided to the extent practical and the project anticipates 2191 sf 10.05 acres) of wetland impact. 383 sf (0.009 acres) of trail will also be removed from a wetland. Additionally, the boat launch will be reconstructed to accommodate better public access in this area. Minnesota Interagency Water Resource Application Form February 2014 Page 4 of 13 Project Name and/or Number: PART FOUR: Aquatic Resource Impact' Summary If your proposed project involves a direct or indirect impact to an aquatic resource (wetland, lake, tributary, etc.) identify each Impact in the table below. Include all anticipated Impacts, including those expected to be temporary. Attach an overhead View map, aerial photo, and /or drawing showing all of the aquatic resources In the project area and the locat'on(s) of the proposed Impacts. Label each aquatic resource on the map with a reference numberor letter and Identify the impacts in the Following table. Aquatic Resource ID (as noted on overhead vlewi Aquatic Resource Type (wetland, lake, tributary etc.) Type of impact (fill, excavate, drain, or remove vegetation) Duration of Impact Permanent (P) or Temporary , (T} Size of Impact ' overall Size of Aquatic Resource a Existing Plant CaCommunity Type(s) in a Impact Area County, Major Watershed N, and Bank of Impact Area Service Area k s ...--- __�� G(W10) - - - - - - -- - -. Wetland Fill P 479sf 979sf Wet meadow Carver, 20,7 H W22 Wetland Fill P 1212 s 56615f Wet Meadow Carver, 20,7 'If Impacts are temporary; enterthe duration of the Impacts In days next to the 'T'. For example, a project with a temporary accessfin that would be removed after 220 days would be entered "T (220) ", 'Impacts less than 0.01 acre should be reported In square feet. Impacts 0.01 acre or greater should be reported as acres and rounded to the nearest 0.01 acre. Tributary impacts must be reported in linear feet of impact and an area of impact by indicating first the linear feet of impact along the flowlme of the stream followed by the area impact in parentheses). For example, a project that impacts 50 feet of a stream that Is feet wide would be reported as 50 It (300 square feet). 'This is generally only applicable if you are applying for a de minimis exemption under MN Rules 8420.0420 Subp. 8, otherwise enter 'N/A". °Use Wetland Plants and plant Community Types of Minnesota and I4rtsconsin 3`r Ed. as modified In MN Rules 8420.0405 Subp, 2. sRerer to Major Watershed and Rank Service Area maps In MN Rules 8420.0522 Subp. 7. If any of the above Identified impacts have already occurred, identify which impacts they are and the circumstances associated with each: NA PART FIVE: Applicant Signature ❑ Check here if you arerequesting a ore-application consultation with the Corps and LGU based on the Information you have provided. Regulatory entities will not initiate a formal applicaton review If this box is checked. By signature below, I attest that the information in this application is complete and accurate. I further attest that I possess the authority to undertake the work described herein. Signature: 1 1� t-bt Date: 7r`,er/ 1 hereby authorize Andf Moffatt, WSB & Associates to act on my behalf as my agent In the processing of this application and to furnish, upon request, supplemental information In support of this application. 1` 1r r' n 4% 4 ' The term impact" as used in thisjoint application form is a generic term used for disclosure purposes to identify activities that may require approval from one or more regulatory agencies. For purposes of this form it is not meant to indicate whether or not those activities may require mitigationfrepiacement. Minnesota Interagency Water Resource App ication Form February 2014 Page 5 of 13 Project Name and /or Number: Attachment B Supporting Information for Applications Involving Exemptions, No Loss Determinations, and Activities Not Requiring Mitigation Complete this part !f you maintain that the Identified aquatic resource Impacts in Part Four do not require wetland replacement /compensatory mitigation OR If you are seeking verification that the proposed water resource Impacts are elth e* exempt from replacement or are not under CWA/WCAjurisdiction. Identify the specific exemption or no -loss provision for which you believe your project or site qualifies: NA Provide a detailed explanation of how your project or site qualifies for the above. Be specific and provide and refer to attachments and exhibits that support your contention. Applicants should refer to rules (e.g. WCA rules), guidance documents (e.g. BWSR guidance, Corps guidance letters /public notices), and permit conditions (e.g. Corps General Permit conditions) to determine the necessary information to support the application. Applicants are strongly encouraged to contact the WCA EGU and Corps Project Manager prior to submitting an applirat on If tl NA kppiir Project Name and/or Number: Attachment C Avoidance and Minimization Project Purpose, Need, and Requirements. Clearly state the purpose of your project and need for your project. Also include a description of any specific requirements of the project as they relate to project location, project footprint, water management, and any other applicable requirements. Attach an overhead plan sheet showing all relevant features of the project (buildings, roads, etc.), aquatic resource features (Impact areas noted) and construction details (grading plans, storm watee management plans, etc.), referencing these as necessary: Carver County Parks has received grant funding for proposed Improvements to lake Minnewashta Regional Park that incudes; road reshaping/paving (Main Park), boat launch improvements, some trail improvements, and construction of an entrance turnaround. The purpose of this project is to improve the public amenities within the park as well as provide safer access along the road for the public. The main road through the park Is currently gravel. This project will pave the road to improve safety and reduce sediment runoff from the road to the surrounding area. The main entrance will also be reconstructed to provide better, safer access and to include a turnaround area. The boat launch is in need of repair, so the project includes reconstructing the existing boat launch to meet DNR requirements. The parking area at the boat launch will also be reconstructed and the existing gravel paved. This will reduce sediment directed to Lake Minnewashta. A trail near the boat launch parking lot will also be reconstructed to provide safer pedestrian access, recreation. This will Include designating a cross -country ski trail In this location also. Avoidance. Both the CWA and the WCA require that Impacts to aquatic resources be avoided if practicable alternatives exist. Clearly describe all on -site measures considered to avoid impacts to aquatic resources and discuss at least two project alternatives that avoid all impacts to aquatic resources on the site. These alternatives may include alternative site pans, alternate sites, and /or not doing the project. Alternatives should be feasible and prudent (see MN Rules 8420.0520 Subp. 2 C)- Applicants are encouraged to attach drawings and plans to support their analysis; Wetland impacts have been avoided to the greatest extent possible. Wetland A Is located at the entrance to the park Initial design of the road included the road slope Impacting this wetland. However, the design has been changed to Include a retaining wall in this location to completely avoid the wetland impact Otherwetlands, including Wetland E, F, B, and C have also been completely avoided, Wetlands G and H include the only Impact on the project for a total of 2191 sf. Wetland G is impactsfrom the boat launch parking lot reconstruction. To avoid additional Impacts to the wooded area north of the parking lot or completely realigning the road on the south, Impacts to this wetland are unavoidable. Wetland H will be impacted from moving the trail in this location. Currently, the existing trail bisects the wetland. The project will remove this existing trail and move It to skirt along the side of the trail. Approximately 383 sf of wetland will be restored with the removal of the trail in this location. Credit is not being sought for this removal, but should be recognized with minimization efforts. There is an existing boat launch within the project that will be reconstructed to accommodate the additional boat traffic at this location. This boat launch design is in conformance with ©NR requirements and as such, does not require a DNR permit. Minimization. Both the CWA and the WCA require that all unavoidable impacts to aquatic resources be minimlted to the greatest extent practicable. Discuss all features o` the proposed project that have been modified to minimize the impacts to water resources (see MN Rules 9420.0520 Subp. 4): Impact to Wetland H is from the realignment of the trail. Currently, a trail goes through the existing wetland. This will he removed and the trail aligned on the edge. The trail will be constructed nearly at grade, so slopes and Impacts have been minimized. Minnesota Interagency Water Resource Application Form February 2014 Page B of 13 Off -Site Alternatives. An off -site alternativesanatysis is not required for all permit applications. If you know that your proposal will require an individual permit Istandard permit or letter of permission) from the US. Army Corps of Engineers, you maybe required to provide an off -she alternatives analysis. The alternatives analysis Is not required for a complete application but must be orovided during the review process In order fo• the Corps to complete the evaluation of your application and reach a final decision. Applicants with questions about when an off -site alternatives analysis is required should contact their Corps Project Manager. NA Minnesota interagency Water Resource Application Form February 2014 Page 9 of 13 Project Name and /or Number: Attachment D Replacement /Compensatory Mitigation Complete this part if your application involves wetland replacement /compensatory mitigation not associated with the local road wetland replacement program. Applicants should consult Corps mitigation guidelines and WCA rules for requirements. Replacement /Compensatory Mitigation via Wetland Banking. Complete this section if you are proposing to use credits from an existing wetland bank (with an account number in the State wetland banking system) for all or part of your replacement /compensatory mitigation requirements. Wetland Bank Account # County Major Watershed # Bank Service Area # Credit Type (if applicable) Number of Credits 1375 Carver 19 7 SWC 0.10 Applicants should attach documentation indicating that they have contacted the wetland bank account owner and reached at least a tentative agreement to utilize the identified credits for the project. This documentation could be a signed purchase agreement, signed application for withdrawal of credits or some other correspondence indicating an agreement between the applicant and the bank owner. However, applicants are advised not to enter into a binding agreement to purchase credits until the mitigation plan is approved by the Corps and LGU. Project- Specific Replacement /Permittee Responsible Mitigation. Complete this section if you are proposing to pursue actions (restoration, creation, preservation, etc.) to generate wetland replacement /compensatory mitigation credits for this proposed project. WCA Action Eligible 1 for Credit Corps Mitigation Compensation z Acres Credit% Requested Credits Anticipated 3 County Major Watershed Bank Service Area # 'Referto the name and subpart number in MN Rule 8420.0526. 'Referto the technique listed in St. Paul District Policy for Wetland Compensatory Mitigation in Minnesota. 3 I WCA and Corps crediting differs, then enter both numbers and distinguish which is Corps and which is WCA. Explain how each proposed action or technique will be completed (e.g. wetland hydrology will be restored by breaking the tile......) and how the proposal meets the crediting criteria associated with it. Applicants should refer to the Corps mitigation policy language, WCA rule language, and all associated Corps and WCA guidance related to the action or technique: Attach a site location map, soils map, recent aerial photograph, and any other maps to show the location and other relevant features of each wetland replacement /mitigation site. Discuss in detail existing vegetation, existing landscape features, land use (on and surrounding the site), existing soils, drainage systems (if present), and water sources and movement. Include a topographic map showing key features related to hydrology and water flow (inlets, outlets, ditches, pumps, etc.): Minnesota Interagency Water Resource Application Form February 2014 Page 10 of 13 Project Name and /or Number: Attach a map of the existing aquatic resources, associated delineation report, and any documentation of regulatory review or approval. Discuss as necessary: For actions involving construction activities, attach construction plans and specifications with all relevant details. Discuss and provide documentation of a hydrologic and hydraulic analysis of the site to define existing conditions, predict project outcomes, identify specific project performance standards and avoid adverse offsite impacts. Plans and specifications should be prepared by a licensed engineer following standard engineering practices. Discuss anticipated construction sequence and timing: For projects involving vegetation restoration, provide a vegetation establishment plan that includes information on site preparation, seed mixes and plant materials, seeding/planting plan (attach seeding/planting zone map), planting/seeding methods, vegetation maintenance, and an anticipated schedule of activities: For projects involving construction or vegetation restoration, identify and discuss goals and specific outcomes that can be determined for credit allocation. Provide a proposed credit allocation table tied to outcomes: Provide a five -year monitoring plan to address project outcomes and credit allocation: Discuss and provide evidence of ownership or rights to conduct wetland replacement /mitigation on each site: Quantify all proposed wetland credits and compare to wetland impacts to identify a proposed wetland replacement ratio. Discuss how this replacement ratio is consistent with Corps and WCA requirements: By signature below, the applicant attests to the following (only required if application involves project - specific /permittee responsible replacement): • All proposed replacement wetlands were not: • Previously restored or created under a prior approved replacement plan or permit • Drained or filled under an exemption during the previous 10 years • Restored with financial assistance from public conservation programs • Restored using private funds, other than landowner funds, unless the funds are paid back with interest to the individual or organization that funded the restoration and the individual or organization notifies the local government unit in writing that the restored wetland may be considered for replacement. • The wetland will be replaced before or concurrent with the actual draining or filling of a wetland. • An irrevocable bank letter of credit, performance bond, or other acceptable security will be provided to guarantee successful completion of the wetland replacement. • Within 30 days of either receiving approval of this application or beginning work on the project, I will record the Declaration of Restrictions and Covenants on the deed forthe property on which the replacement wetland(s) will be located and submit proof of such recording to the LGU and the Corps. Applicant or Representative: Title: 1'r' nclw Signature: J w r' 6 Date: - I (ZZ/ N Minnesota Interagency Water Resource Application Form February 2014 Page 11 of 13 Appendix A - Figures a+ NoOY RC 1�•. p- •I, p 6 MICRneLn 9N PO d i I 1 1 i 1 IRMtl> P� ^�• yl.°!gc is a,., �. .. E saa . I � sm�a=• ^xa _ e 0 1 u.o anWawooa °;;° I -� c s l "waa„ '� -J 1 r,• S ♦ 1 ayd d [a ipl. Uyaw aan 9, ,.. �_� s�u.aoo9 oye z � , yy • - v , L � ca�yra � P an ..r C awm,rw MU ,a l naa nr �1 1 V _ iy F aluM°.i' 1 P�ln Pa 'q Rygional i $ 4 .. R° 4 ywaahtn I LP. 1 "P. 1 \f �ynV ,wtlp, ...nWt,Pw � V'r410 f1•s•� 0. 4n M RW/ aWl Y11tlYeww w nmsl R ¢ � � yg SY 04w G• I s s 5 1 ' uM1 malt ne� 4 I 'Im4M11Vm BFC ,�1 NOtlPVm ay , w , I. ..a i I t wrY. one i u I e 1 � 1 J 4 J rtes: Esri, DeLprpe,N USGS, lntermap, iPC, NRCAN, Esri Japan, i ,AVI-EQ, -- 'tJIETI, Earl China (Hong Kong), Esri (Thai1and1 , TomTom, 2013 Figure 1. Project Location Lake Minnewashta Regional Park - - ®Project Limits L I City Limits MB oR,vE Chanhassen, Minnesota LLX Lake Minnewashta Cinch= 2,000feet 29• Excelsior - 0 4 ;Caumr, Club La SHOR WOOD . ..... q �3a rode 41 X" '7 — - — - — - — - — - — - — — - — - — - — - — - 17� 10 & 4p 4 1 27 I tef- 0 'es 0 f Z 41, VA? 7-- 0 S, copXr.ight.020A Nat fo6al Geographic Spciety,i-cubed. Figure la. 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I T 1 1 r 1 1 1 1 1 I Y \ I c 5$ ° w x NN�k w a a I 0 I j �r -r I ll( 1 �1 I I 1 I 1 \ 1 1 Appendix B — Plan set Appendix C — NPDES Permit m V L 'J c O T O v a r o O �v 411�411 E 0 CL E Y L a O m JU E Z �F+ .O L a r O N ti TOM ti CD CD Im .E L a mo a� 0 N M w LO w LO O o cc CO E m L Q% o Q O d Lo 20) N w N N to U LO M (n N (0 N m c m a� E am L O > L U a m d c � 0 3 U 7 O N N c U p oO U a a� 3 m U C L L O O i N � a� 3 w rnE = O aN m N 0) N E C O w N N 7 a U m > > O w- t m Y U) CL T Vi ) Q 0 O O Q� o +�+ W o E O t ao O � /7 C C W Cl) 3 0) O /�O -`, Wi L � _ Cdr • ^yam O -W CO L L a Z N O VJ C a) ++ •� � w 7 C C 0Lu _ (1) mw O 7 C LOUV a) 0 3 d Gi o V 0 CD m O ca ca L) Z ° W o ca }' co 3 — — N "o °mn Z ++ i IL o — CO � = C a N •- L > L Gi N (n O Qi i a�� a m Z U oU a) C CL H 0 � E 0 CL E Y L a O m JU E Z �F+ .O L a r O N ti TOM ti CD CD Im .E L a mo a� 0 N M w LO w LO O o cc CO E m L Q% o Q O d Lo 20) N w N N to U LO M (n N (0 N m c m a� E am L O > L U a m d c � 0 3 U 7 O N N c U p oO U a a� 3 m U C L L O O i N � a� 3 w rnE = O aN m N 0) N E C O w N N 7 a U m > > O w- t Appendix D — Supporting Stormwater Management Analysis I 41 M. 22. I �1 � �I ._._ Av) m _ 'Emil H Hill. � W � X Q < , 7 \ xa d 0 J F `o m Q Ems [a 2 - �a F 2 � UU Z? m J 0 W J m 0 0 VlOS3NNIW 'AlN000 N3ANY3 103fOLd 1N3W3AOVdWI MVd KOZ MVd 1VNOIGM VIHSVM3NNIW 3MVl i 8.M al � o f � R / I li' I 8 S 'o I 1 • P W J �w v LLI \ \\ Q \\ U' m W X CE QQ Q U Z v v A\ F: V A U H in W U O O U \ o VlOS3NNIW 'AlN000 N3ANY3 103fOLd 1N3W3AOVdWI MVd KOZ MVd 1VNOIGM VIHSVM3NNIW 3MVl i 8.M al � o f � R / I li' I 8 S 'o I 1 • P W J �w v LLI \ \\ Q \\ U' m W X CE QQ Q U Z v v A\ F: V A U H in W U O O U \ o 8 S 'o I 1 • P W J �w v LLI \ \\ Q \\ U' m W X CE QQ Q U Z v v A\ F: V A U H in W U O O U \ o 08/ �PREFV Wcoat launch / EA 10R r. 1 WITH DOCK 5S RECYCLING QS COMPOST /TRASH SIN AREA 80'X 17' TIE DOWN' AREA 35 VEHICLE / TRAILER STALLS Dca Reach on Link 9S B is6ng Boat Launch CONCRETE PAD FOR PORTABLE RESTROOMS "\ --8 VEHICLE STALLS 7P��\�` ` 8S/ `8R F. 3S Routing Diagram for Boat Landing Prepared by HP, Printed 7/7/2014 HydroCAM 10.00 s/n 00883 0 2012 HydroCAD Software Solutions LLC Boat Landing Prepared by HP Printed 7/7/2014 HydroCAD® 10.00 s/n 00883 © 2012 HydroCAD Software Solutions LLC Page 2 Area Listing (all nodes) Area CN Description (acres) (subcatch ment-n u m bers) 1.276 98 (3S, 5S, 6S, 8S) 1.421 61 (3S, 5S, 6S, 10S) 1.297 61 >75% Grass cover, Good, HSG B (9S) 0.800 85 existing north parking lot (9S) 0.600 85 existing south parking lot (9S) 5.394 76 TOTAL AREA Boat Landing Type 1124 -hr lyrRainfall= 2.40" Prepared by HP Printed 7/7/2014 HydroCAD ®10.00 s/n 00883 © 2012 HydroCAD Software Solution_sLLC Pape 3 Time span =5.00 -20.00 hrs, dt =0.05 hrs, 301 points Runoff by SCS TR -20 method, UH =SCS Reach routing by Stor- Ind +Trans method - Pond routing by Stor -Ind method Subcatchment3S: Runoff Area =0.396 ac 94.44% Impervious Runoff Depth >1.84" Tc =10.0 min CN =96 Runoff =1.10 cfs 0.061 of Subcatchment 5S: Runoff Area =1.030 ac 69.90% Impervious Runoff Depth >1.13" Tc =10.0 min CN =87 Runoff =1.92 cfs 0.097 of Subcatchment6S: Runoff Area =0.309 ac 6.47% Impervious Runoff Depth >0.18" Tc =10.0 min CN =63 Runoff =0.05 cfs 0.005 of Subcatchment8S: Runoff Area =0.162 ac 100.00% Impervious Runoff Depth >2.02" Tc =10.0 min CN =98 Runoff =0.47 cfs 0.027 of Subcatchment9S: Existing Boat Launch Runoff Area =2.697 ac 0.00% Impervious Runoff Depth >0.45" Tc =10.0 min CN =73 Runoff =1.88 cfs 0.102 of Subcatchment 10S: north boat launch - Runoff Area =0.800 ac 0.00% Impervious Runoff Depth >0.14" Tc =10.0 min CN =61 Runoff =0.07 cfs 0.009 of Reach 8R: swale Avg. Flow Depth =0.07' Max Vet =2.05 fps Inflow =0.49 cfs 0.024 of n =0.030 L= 230.0' S= 0.0674'/' Capacity= 306.66 cfs Outflow =0.42 cfs 0.024 of Reach 1OR: to Minnewashta PROPOSED Inflow =1.03 cfs 0.119 of Outflow =1.03 cfs 0.119 of Pond 1P: Rain Garden Peak Elev= 965.11' Storage =0.033 of Inflow =1.10 cfs 0.061 of Discarded =0.01 cfs 0.006 of Primary=0.49 cfs 0.024 of Outflow =0.50 cfs 0.030 of Pond 2P: Rain Garden w/ Yard Drain Peak Elev= 949.69' Storage =0.014 of Inflow =1.92 cfs 0.121 of Discarded =0.00 cfs 0.003 of Primary=1.89 cfs 0.106 of Secondary=0.00 cfs 0.000 of Outflow =1.90 cfs 0.109 of Pond 4P: Stormwater Basin Peak Elev= 946.51' Storage =0.060 of Inflow =1.94 cfs 0.110 of Primary=0.98 cfs 0.106 of Secondary=0.00 cfs 0.000 of Outflow =0.98 cfs 0.106 of Pond 7P: Peak Elev= 952.51' Storage =0.017 of Inflow =0.47 cfs 0.027 of Discarded =0.01 cfs 0.006 of Primary=0.05 cfs 0.004 of Outflow =0.06 cfs 0.010 of Total Runoff Area = 5.394 ac Runoff Volume = 0.300 of Average Runoff Depth = 0.67" 76.34% Pervious = 4.118 ac 23.66% Impervious= 1.276 ac Boat Landing Type 1/ 24 -hr lyrRainfall= 2.40" Prepared by HP Printed 7/7/2014 HydroCAD ®10.00 s/n 00883 © 2012 HydroCAD Software Solutions LLC Page 4 Summary for Subcatchment 3S: Runoff = 1.10 cfs @ 12.01 hrs, Volume= 0.061 af, Depth> 1.84" Runoff by SCS TR -20 method, UH =SCS, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Type II 24 -hr lyr Rainfall= 2.40" Area (ac) CN Description 0.374 98 * r1 /100 GA 0.396 96 Weighted Average 0.022 5.56% Pervious Area 0.374 94.44% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.0 Direct Entry, N `u 3 LL Subcatchment 3S: Hydrograph 1.10 cfs Type II 24 -hr 1yr Rainfall =2.40" Runoff Area =0.396 ac Runoff Volume =0.061 of Runoff Depth >1.84" Tc =10.0 min CN =96 0-1 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) —Runoff Boat Landing Type 1124 -hr lyrRainfall= 2.40" Prepared by HP Printed 7/7/2014 HydroCADO 10.00 s/n 00883 © 2012 HydroCAD Software Solutions LLC Page 5 Summary for Subcatchment 5S: Runoff = 1.92 cfs @ 12.02 hrs, Volume= 0.097 af, Depth> 1.13" Runoff by SCS TR -20 method, UH =SCS, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Type II 24 -hr 1yr Rainfall= 2.40" Area (ac) CN Description 0.720 98 1.030 87 Weighted Average 0.310 30.10% Pervious Area 0.720 69.90% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.0 Direct Entry, Subcatchment 5S: Hydrograph — RunoN Type II 24 -hr 1yr Rainfall= 2.40rr Runoff Area =1.030 ac a 11 Runoff Volume =0.097 of Runoff Depth >1.13" LL Tc =10.0 min I I I CN =87 12 13 14 15 Time (hours) Boat Landing Prepared by HP Type 1124-hr 1 yr Rainfall = 2.40" Printed 7/7/2014 Summary for Subcatchment 6S: Runoff = 0.05 cfs @ 12.07 hrs, Volume= 0.005 af, Depth> 0.18" Runoff by SCS TR -20 method, UH =SCS, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Type 1124 -hr 1yrRainfall= 2.40" Area (ac) CN Description 0.020 98 * n non c4 0.309 63 Weighted Average 0.289 93.53% Pervious Area 0.020 6.47% Impervious Area Tc Length 10.0 3 0 LL 0.01 7 a 9 10 Description Direct Entry, Subcatchment 6S: Hydrograph Type II 24 -hr 1yr Rainfall =2.40" Runoff Area =0.309 ac Runoff Volume =0.005 of Runoff Depth >0.18" Tc =10.0 min CN =63 Time (hours) — Runoff Boat Landing Type 1124 -hr lyr Rainfall=2.40 " Prepared by HP Printed 7/7/2014 HydroCAD ®10.00 s/n 00883 © 2012 HydroCAD Software Solutions LLC Page 7 Summary for Subcatchment 8S: Runoff = 0.47 cfs @ 12.01 hrs, Volume= 0.027 af, Depth> 2.02" Runoff by SCS TR -20 method, UH =SCS, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Type II 24 -hr lyr Rainfall= 2.40" Area (ac) CN Description 0.162 98 0.162 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.0 Direct Entry, % 0.3 � 0.28 0.26 EO 0.24 0.18 0.16 0.14 0.12 Subcatchment 8S: Hydrograph Type II 24 -hr 1yr Rainfall= 2.40" Runoff Area = 0.162 ac Runoff Volume =0.027 of Runoff Depth >2 .-02" Tc =10.0 min CN =98 9 10 11 12 13 14 15 16 17 18 19 Time (hours) —Runoff Boat Landing Prepared by HP Type /if 24 -hr 1 yr Rainfall =2.40" Printed 7/7/2014 Summary for Subcatchment 9S: Existing Boat Launch Runoff = 1.88 cfs @ 12.04 hrs, Volume= 0.102 af, Depth> 0.45' Runoff by SCS TR -20 method, UH =SCS, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Type II 24 -hr lyr Rainfall= 2.40" Area (ac) CN Descriotion 0.600 85 existing south parking lot 1.297 61 >75% Grass cover, Good, HSG B 0.800 85 existing north parking lot 2.697 73 Weighted Average 2.697 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.0 Direct Entry, 3 0 LL Subcatchment 9S: Existing Boat Launch Hydrograph 2 1.88 cfs Type II 24 -hr 1yr Rainfall= 2.40" Runoff Area =2.697 ac Runoff Volume =0.102 of Runoff Depth >0.45" Tc =10.0 min CN =73 0 5 fi 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) — Runoff Boat Landing Type 1124 -hr 1yrRainfall= 2.40" Prepared by HP Printed 7/7/2014 HydroCAD ®10.00 s/n 00883 @ 2012 HydroCAD Software Solutions LLC Page 9 Summary for Subcatchment 10S: north boat launch - gravel removed Runoff = 0.07 cfs @ 12.08 hrs, Volume= 0.009 af, Depth> 0.14" Runoff by SCS TR -20 method, UH =SCS, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Type II 24 -hr lyr Rainfall= 2.40" Area (ac) CN Description 0.800 100.00% Pervious Area Tc Length Slope Velocity Capacity Description 10.0 Direct Entry, Subcatchment 10S: north boat launch - gravel removed Hydrograph 0.065 Type II 24 -hr 0.06 1yr Rainfall= 2.40" 0.055 Runoff Area =0.800 ac 0.05 0.045 Runoff Volume =0.009 of 0.04 Runoff Depth >0.14" LL 0.035 - Tc =10.0 min 0.03 n CN =61 0.01 11 12 13 Time (hours) — RunoR Boat Landing Type// 24 -hr 1yrRainfall= 2.40" Prepared by HP Printed 7/7/2014 HydrOCADO 10.00 s/n 00883 © 2012 HydroCAD Software Solutions LLC Pace 10 Summary for Reach 8R: swale Inflow Area = 0.396 ac, 94.44% Impervious, Inflow Depth > 0.72" for lyr event Inflow = 0.49 cfs @ 12.16 hrs, Volume= 0.024 of Outflow = 0.42 cfs @ 12.23 hrs, Volume= 0.024 af, Atten= 15 %, Lag= 4.3 min Routing by Stor- Ind +Trans method, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Max. Velocity= 2.05 fps, Min. Travel Time= 1.9 min Avg. Velocity = 0.98 fps, Avg. Travel Time= 3.9 min Peak Storage= 51 cf @ 12.20 hrs Average Depth at Peak Storage= 0.07' Bank -Full Depth= 2.00' Flow Area= 22.0 sf, Capacity= 306.66 cfs 3.00' x 2.00' deep channel, n= 0.030 Side Slope Z- value= 4.07' Top Width= 19.00' Length= 230.0' Slope= 0.0674T Inlet Invert= 965.50', Outlet Invert= 950.00' Reach 8R: swale Hydrograph 0.45 042 Inflow Area =0.396 ac 0.4 Avg. Flow Depth =0.07' 0.35 Max Vet =2.05 fps 0.3 n =0.030 0.251 L= 230.0' LL 021 u� Capacity=306.66 cfs, 0.15 0.1 12 13 14 15 16 17 18 19 20 Time (hours) Inflow — Outflow Boat Landing Type 1124 -hr 1 yr Rainfall= 2.40" Prepared by HP Printed 7/7/2014 HydrOCAD ®10.00 s/n 00883 © 2012 HydroCAD Software Solutions LLC Page 11 Summary for Reach 1OR: to Minnewashta PROPOSED Inflow Area = 2.697 ac, 47.31 % Impervious, Inflow Depth > 0.53" for 1 yr event Inflow = 1.03 cfs @ 12.20 hrs, Volume= 0.119 of Outflow = 1.03 cfs @ 12.20 hrs, Volume= 0.119 af, Atten= 0 %, Lag= 0.0 min Routing by Stor- Ind +Trans method, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs N u 3 0 LL Reach 10R: to Minnewashta PROPOSED Hydrograph 1.03 cfs 1 Inflow Area =2.697 ac 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 rime (hours) Inflow Outflow Boat Landing Type 1124 -hr 1yrRainfall= 2.40" Prepared by HP Printed 7/7/2014 HydroCADO 10.00 s/n 00883 © 2012 HydroCAD Software Solutions LLC Page 12 Summary for Pond 1 P: Rain Garden Inflow Area = 0.396 ac, 94.44% Impervious, Inflow Depth > 1.84" for 1 y event Inflow = 1.10 cfs @ 12.01 hrs, Volume= 0.061 of Outflow = 0.50 cfs @ 12.16 hrs, Volume= 0.030 af, Atten= 54 %, Lag= 9.2 min Discarded = 0.01 cfs @ 12.16 hrs, Volume= 0.006 of Primary = 0.49 cfs @ 12.16 hrs, Volume= 0.024 of Routing by Stor -Ind method, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Peak Elev= 965.11' @ 12.16 hrs Surf.Area= 0.023 ac Storage= 0.033 of Plug -Flow detention time= 160.7 min calculated for 0.030 of (50% of inflow) Center -of -Mass det. time= 77.2 min ( 828.3 - 751.1 ) Volume Invert Avail.Storage Storage Description #1 963.00' 0.059 of Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (acres) (acre -feet) (acre -feet) 963.00 0.009 0.000 0.000 964.00 0.015 0.012 0.012 965.00 0.022 0.018 0.030 966.00 0.035 0.028 0.059 Device Routing Invert Outlet Devices #1 Primary 965.00' S.0' long x 2.0' breadth Broad - Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 3.50 Coef. (English) 2.54 2.61 2.61 2.60 2.66 2.70 2.77 2.89 2.88 2.85 3.07 3.20 3.32 #2 Discarded 963.00' 0.300 in /hr Exfiltration over Surface area Qiscarded OutFlow Max =0.01 cfs @ 12.16 hrs HW= 965.11' (Free Discharge) 2= Exfiltration (Exfiltration Controls 0.01 cfs) Primary OutFlow Max =0.46 cfs @ 12.16 hrs HW= 965.11' (Free Discharge) 't--1 =Broad-Crested Rectangular Weir(Weir Controls 0.46 cfs @ 0.84 fps) Boat Landing Prepared by HP F u 3 0 LL Pond 1 P: Rain Garden Hydrograph Type// 24 -hr 1 yr Rainfall =2.40" Printed 7/7/2014 Inflow Area =0.396 ac Time (hours) Peak Elev= 965.11' Storage =0.033 of iR — Inflow — Ou rnow — Discarded — Primary Boat Landing Prepared by HP Type// 24 -hr 1 yr Rainfall =2.40" Printed 7/7/2014 Summary for Pond 213: Rain Garden w/ Yard Drain Inflow Area = 1.426 ac, 76.72% Impervious, Inflow Depth > 1.02" for lyr event Inflow = 1.92 cfs @ 12.02 hrs, Volume= 0.121 of Outflow = 1.90 cfs @ 12.03 hrs, Volume= 0.109 af, Atten= 1 %, Lag= 0.8 min Discarded = 0.00 cfs @ 12.03 hrs, Volume= 0.003 of Primary = 1.89 cfs @ 12.03 hrs, Volume= 0.106 of Secondary = 0.00 cfs @ 5.00 hrs, Volume= 0.000 of Routing by Stor -Ind method, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Peak Elev= 949.69' @ 12.03 hrs Surf.Area= 0.014 ac Storage= 0.014 of Plug -Flow detention time= 47.0 min calculated for 0.109 of (90% of inflow) Center -of -Mass det. time= 14.1 min ( 811.6 - 797.5 ) Volume Invert Avail.Storage Storage Description #1 948.00' 0.039 of Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (acres) (acre -feet) (acre -feet) 948.00 0.004 0.000 0.000 949.00 0.009 0.006 0.006 950.00 0.016 0.012 0.019 951.00 0.024 0.020 0.039 Device Routing Invert Outlet Devices #1 Primary 946.00' 15.0" Round Culvert L= 71.0' Ke= 0.500 Inlet / Outlet Invert= 946.00'/ 945.00' S= 0.0141 T Cc= 0.900 n= 0.014, Flow Area= 1.23 sf #2 Secondary 950.30' 20.0' long x 20.0' breadth Broad - Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63 #3 Device 1 949.50' 27.0" Horiz. Orifice /Grate C= 0.600 Limited to weir flow at low heads #4 Discarded 948.00' 0.300 in /hr Exfiltration over Surface area Discarded OutFlow Max =0.00 cfs @ 12.03 hrs HW= 949.69' (Free Discharge) t41= Exi'iltration (Exfiltration Controls 0.00 cfs) Primary OutFlow Max =1.84 cfs @ 12.03 hrs HW= 949.69' (Free Discharge) t1=Culvert (Passes 1.84 cfs of 9.87 cfs potential flow) 3= Orifice /Grate (Weir Controls 1.84 cfs @ 1.41 fps) $ econdary OutFlow Max =0.00 cfs @ 5.00 hrs HW= 948.00' (Free Discharge) r-2= Broad - Crested Rectangular Weir( Controls 0.00 cfs) Boat Landing Type 1124 -hr lyrRainfall= 2.40" Prepared by HP Printed 7/7/2014 HydroCADO 10.00 s/n 00883 © 2012 HydroCAD Software Solutions LLC Page 15 N `u 0 1 LL Pond 2P: Rain Garden w/ Yard Drain Hydrograph — Inflow ° Outflow — Discarded — — Secondary Storage =0.014 of 12 13 14 15 16 17 18 19 20 Time (hours) Inflow Area =1.426 ac Primary Peak Elev= 949.69' Storage =0.014 of 12 13 14 15 16 17 18 19 20 Time (hours) Boat Landing Type 1124 -hr 1yrRainfall =2.40" Prepared by HP Printed 7/7/2014 HydroCAD ®10.00 s/n 00883 @ 2012 HvdroCAD Software Solutions LLC Page 16 Summary for Pond 4P: Stormwater Basin Inflow Area = 1.735 ac, 64.21 % Impervious, Inflow Depth > 0.76" for 1 yr event Inflow = 1.94 cfs @ 12.03 hrs, Volume= 0.110 of Outflow = 0.98 cfs @ 12.22 hrs, Volume= 0.106 af, Atten= 49 %, Lag= 11.1 min Primary = 0.98 cfs @ 12.22 hrs, Volume= 0.106 of Secondary = 0.00 cfs @ 5.00 hrs, Volume= 0.000 of Routing by Stor -Ind method, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Starting Elev= 946.00' Surf.Area= 0.045 ac Storage= 0.034 of Peak Elev= 946.51' @ 12.22 hrs Surf.Area= 0.056 ac Storage= 0.060 of (0.026 of above start) Plug -Flow detention time= 143.7 min calculated for 0.072 of (65% of inflow) Center -of -Mass det. time= 21.5 min ( 833.0 - 811.5 ) Volume Invert Avail.Storage Storage Description #1 945.00' 0.245 of Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (acres) (acre -feet) (acre -feet) 945.00 0.023 0.000 0.000 946.00 0.045 0.034 0.034 947.00 0.066 0.055 0.089 948.00 0.078 0.072 0.161 949.00 0.090 0.084 0.245 Device Routing Invert Outlet Devices #1 Primary 946.00' 12.0" Round Culvert L= 100.0' Ke= 0.500 Inlet/ Outlet Invert= 946.00'/ 945.00' S= 0.0100 T Cc= 0.900 n=0.013, Flow Area= 0.79 sf #2 Secondary 948.50' 10.0' long x 10.0' breadth Broad - Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64 Primary OutFlow Max =0.98 cfs @ 12.22 hrs HW= 946.51' (Free Discharge) t-1 = Culvert (Inlet Controls 0.98 cfs @ 2.43 fps) $ econdary OutFlow Max =0.00 cfs @ 5.00 hrs HW= 946.00' (Free Discharge) 2= Broad - Crested Rectangular Weir( Controls 0.00 cfs) Boat Landing Prepared by HP N V O 1 LL Type// 24 -hr 1 yr Rainfall= 2.40" Printed 7/7/2014 Pond 4P: Stormwater Basin Hydrograph Inflow Area =1.735 ac Time (hours) Peak Elev= 946.51' Storage =0.060 of 20 — Inflow — Outflow — Primary — Secondary Boat Landing Type 1124 -hr lyrRainfall= 2.40" Prepared by HP Printed 7/7/2014 HydroCAD ®10.00 s/n 00883 © 2012 HydroCAD Software Solutions LLC Paae 18 Summary for Pond 7P: Inflow Area = 0.162 ac,100.00% Impervious, Inflow Depth > 2.02" for lyr event Inflow = 0.47 cfs @ 12.01 hrs, Volume= 0.027 of Outflow = 0.06 cfs @ 12.39 hrs, Volume= 0.010 af, Atten= 87 %, Lag= 23.0 min Discarded = 0.01 cfs @ 12.39 hrs, Volume= 0.006 of Primary = 0.05 cfs @ 12.39 hrs, Volume= 0.004 of Routing by Stor -Ind method, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Peak Elev= 952.51' @ 12.39 hrs Surf.Area= 0.026 ac Storage= 0.017 of Plug -Flow detention time= 219.5 min calculated for 0.010 of (38% of inflow) Center -of -Mass det. time= 111.1 min ( 850.2 - 739.2 ) Volume Invert Avail.Storage Storage Description #1 951.00' 0.089 of Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (acres) (acre -feet) (acre -feet) 951.00 0.005 0.000 0.000 952.00 0.011 0.008 0.008 953.00 0.040 0.025 0.033 954.00 0.070 0.055 0.089 Device Routing Invert Outlet Devices #1 Primary 952.50' 10.0' long x 5.0' breadth Broad - Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 3.50 4.00 4.50 5.00 5.50 Coef. (English) 2.34 2.50 2.70 2.68 2.68 2.66 2.65 2.65 2.65 2.65 2.67 2.66 2.68 2.70 2.74 2.79 2.88 #2 Discarded 951.00' 0.300 in /hr Exfiltration over Surface area scarded OutFlow Max =0.01 cfs @ 12.39 hrs HW= 952.51' (Free Discharge) 2= Exfiltration (Exfiltration Controls 0.01 cfs) tnmary OutFlow Max =0.04 cfs @ 12.39 hrs HW= 952.51' (Free Discharge) 1= Broad- Crested Rectangular Weir(Weir Controls 0.04 cfs @ 0.27 fps) Boat Landing Type// 24 -hr lyr Rainfall =2.40" Prepared by HP Printed 7/7/2014 HydroCADO 10.00 s/n 00883 © 2012 HydroCAD Software Solutions LLC Paae 19 N O LL Pond 7P: Hydrograph Time (hours) — Inflow — Outflow — Discarded Primary Boat Landing Type 1124 -hr 10yr Rainfall =4.20" Prepared by HP Printed 7/7/2014 HydroCAD ®10.00 s/n 00883 © 2012 HydroCAD Software Solutions LLC Paae 20 Time span =5.00 -20.00 hrs, dt =0.05 hrs, 301 points Runoff by SCS TR -20 method, UH =SCS Reach routing by Stor- Ind +Trans method - Pond routing by Stor -Ind method Subcatchment3S: Runoff Area =0.396 ac 94.44% Impervious Runoff Depth >3.48" Tc =10.0 min CN =96 Runoff--2.01 cfs 0.115 of Subcatchment5S: Runoff Area =1.030 ac 69.90% Impervious Runoff Depth >2.63" Tc =10.0 min CN =87 Runoff--4.31 cfs 0.226 of Subcatchment6S: Runoff Area =0.309 ac 6.47% Impervious Runoff Depth >0.91" Tc =10.0 min CN =63 Runoff =0.45 cfs 0.024 of Subcatchment8S: Runoff Area =0.162 ac 100.00% Impervious Runoff Depth >3.65" Tc =10.0 min CN =98 Runoff =0.84 cfs 0.049 of Subcatchment9S: Existing Boat Launch Runoff Area =2.697 ac 0.00% Impervious Runoff Depth >1.52" Tc =10.0 min CN =73 Runoff--6.79 cfs 0.342 of Subcatchmentl OS: north boat launch - Runoff Area =0.800 ac 0.00% Impervious Runoff Depth >0.81" Tc =10.0 min CN =61 Runoff =1.00 cfs 0.054 of Reach 8R: swale Avg. Flow Depth =0.16' Max Vet =3.35 fps Inflow =1.92 cfs 0.077 of n =0.030 L= 230.0' S= 0.0674 7' Capacity = 306.66 cfs Outflow =1.85 cfs 0.077 of Reach 1 OR: to Minnewashta PROPOSED Inflow =4.85 cfs 0.383 of Outflow =4.85 cfs 0.383 of Pond 1 P: Rain Garden Peak Elev= 965.28' Storage =0.037 of Inflow =2.01 cfs 0.115 of Discarded =0.01 cfs 0.007 of Primary=1.92 cfs 0.077 of Outflow =1.93 cfs 0.084 of Pond 2P: Rain Garden w/ Yard Drain Peak Elev= 949.91' Storage =0.018 of Inflow =5.98 cfs 0.303 of Discarded =0.00 cfs 0.004 of Primary=5.97 cfs 0.287 of Secondary=0.00 cfs 0.000 of Outflow =5.98 cfs 0.291 of Pond 4P: Stormwater Basin Peak Elev= 947.37' Storage =0.114 of Inflow =6.42 cfs 0.311 of Primary=3.42 cfs 0.304 of Secondary=0.00 cfs 0.000 of Outflow =3.42 cfs 0.304 of Pond 7P: Peak Elev= 952.60' Storage =0.020 of Inflow =0.84 cfs 0.049 of Discarded =0.01 cfs 0.007 of Primary=0.79 cfs 0.025 of Outflow =0.79 cfs 0.032 of Total Runoff Area = 5.394 ac Runoff Volume = 0.809 of Average Runoff Depth = 1.80" 76.34% Pervious = 4.118 ac 23.66% Impervious = 1.276 ac Boat Landing Prepared by HP Type// 24 -hr 10yr Rainfall = 4.20" Printed 717/2014 Summary for Subcatchment 3S: Runoff = 2.01 cfs @ 12.01 hrs, Volume= 0.115 af, Depth> 3.48" Runoff by SCS TR -20 method, UH =SCS, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Type II 24 -hr 10yr Rainfall= 4.20" Area (ac) CN DesCHDtlon 0.374 98 0.022 61 0.396 96 Weighted Average 0.022 5.56% Pervious Area 0.374 94.44% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.0 Direct Entry, r u 3 0 LL Subcatchment 3S: Hydrograph Type II 24 -hr 10yr Rainfall= 4.20" Runoff Area =0.396 ac Runoff Volume =0.115 of Time (hours) Runoff Depth >3.48" Tc =10.0 min �c�u�r�ri CN =96 — Runoff Boat Landing Type 1124 -hr 10yr Rainfall= 4.20" Prepared by HP Printed 7/7/2014 HydroCAD ®10.00 s/n 00883 © 2012 HydroCAD Software Solutions LLC Page 22 Summary for Subcatchment 5S: Runoff = 4.31 cfs @ 12.01 hrs, Volume= 0.226 af, Depth> 2.63" Runoff by SCS TR -20 method, UH =SCS, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Type II 24 -hr 10yr Rainfall= 4.20" Area (ac) CN Description 0.720 98 A O4A C4 1.030 87 Weighted Average 0.310 30.10% Pervious Area 0.720 69.90% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.0 Direct Entry, u 3 0 LL 5 6 7 8 Subcatchment 5S: Hydrograph Type II 24 -hr 10yr Rainfall= 4.20" Runoff Area = 1.030 ac Runoff Volume =0.226 of Time (hours( Runoff Depth >2.63" Tc =10.0 min CN =87 —Runoff Boat Landing Type// 24 -hr 10yr Rainfall= 4.20" Prepared by HP Printed 7/7/2014 HydroCADO 10.00 s/n 00883 © 2012 HydroCAD Software Solutions LLC Page 23 Summary for Subcatchment 6S: Runoff = 0.45 cfs @ 12.03 hrs, Volume= 0.024 af, Depth> 0.91" Runoff by SCS TR -20 method, UH =SCS, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Type II 24 -hr 10yr Rainfall= 4.20" Area (ac) CN Descriotion 0.020 98 0.289 61 0.309 63 Weighted Average 0.289 93.53% Pervious Area 0.020 6.47% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (fUft) (ft/sec) (cfs) 10.0 Direct Entry, Subcatchment 6S: Hydrograph —Runoff 0.42. Type II 24 -hr 0.4 0:36 - 10yr Rainfall= 4.20" 0.34 0.32 Runoff Area =0.309 ac 03- � 0.28 Runoff Volume =0.024 of 0.26 c 6.24 Runoff Depth >0.91" M 0.22 6.2 Tc =10.0 min 6.18 0.16 CN =63 6.14 0.12 0.1 12 13 14 15 16 17 18 19 20 Time (hours) Boat Landing Type 1124 -hr 10yr Rainfall =4.20" Prepared by HP Printed 7/7/2014 HydroCAD ®10.00 s/n 00883 © 2012 HydroCAD Software Solutions LLC Paae 24 Summary for Subcatchment 8S: Runoff = 0.84 cfs @ 12.01 hrs, Volume= 0.049 af, Depth> 3.65' Runoff by SCS TR -20 method, UH =SCS, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Type II 24 -hr 10yr Rainfall= 4.20" Area (ac) CN Description 0.162 98 0.162 100.00% Impervious Area Tc Length Slope Velocity Capacity Description 10.0 x.55 0.5 0.45 LL n A] 0. Direct Entry, Subcatchment 8S: Hydrograph Type II 24 -hr 10yr Rainfall= 4.20" Runoff Area =0.162 ac Runoff Volume =0.049 of Runoff Depth >3.65" Tc =10.0 min CN =98 Time (hours) —Runoff Boat Landing Type 1124 -hr 10yr Rainfall =4.20" Prepared by HP Printed 7/7/2014 HydroCAD ®10.00 s/n 00883 @ 2012 HvdroCAD Software Solutions LLC Page 25 Summary for Subcatchment 9S: Existing Boat Launch Runoff = 6.79 cfs @ 12.02 hrs, Volume= 0.342 af, Depth> 1.52" Runoff by SCS TR -20 method, UH =SCS, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Type II 24 -hr 10yr Rainfall= 4.20" Area (ac) CN Description 0.600 85 existing south parking lot 1.297 61 >75% Grass cover, Good, HSG B 0.800 85 existing north parking lot 2.697 73 Weighted Average 2.697 100.00% Pervious Area Tc Length Capacity Description 10.0 Direct Entry, 0 LL Subcatchment 9S: Existing Boat Launch Hydrograph Type II 24 -hr 10yr Rainfall =4.20" Runoff Area =2.697 ac Runoff Volume =0.342 of rime (hours) Runoff Depth >1.52" Tc =10.0 min CN =73 —Runoff Boat Landing Type 1124 -hr 10yr Rainfall= 4.20" Prepared by HP Printed 7/7/2014 HydroCAD® 10.00 s/n 00883 © 2012 HydroCAD Software Solutions LLC Paae 26 Summary for Subcatchment 10S: north boat launch - gravel removed Runoff = 1.00 cfs @ 12.04 hrs, Volume= 0.054 af, Depth> 0.81" Runoff by SCS TR -20 method, UH =SCS, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Type II 24 -hr 10yr Rainfall= 4.20" Area (ac) CN Description n onn G9 0.800 100.00% Pervious Area Tc Length Slope Velocity Capacity Description 10.0 Direct Entry, 3 0 LL Subcatchment 10S: north boat launch - gravel removed Hydrograph Type II 24 -hr 10yr Rainfall= 4.20" Runoff Area =0.800 ac Runoff Volume =0.054 of Runoff Depth >0.81" Tc =10.0 min CN =61 5 6 7 8 9 10 11 12 13 Time (hours) — Runoff Boat Landing Type 1124 -hr 10yr Rainfall =4.20" Prepared by HP Printed 7/7/2014 HydrOCAD ®10.00 s/n 00883 02012 HVdrOCAD Software Solutions LLC Page 27 Summary for Reach 8R: swale Inflow Area = 0.396 ac, 94.44% Impervious, Inflow Depth > 2.35" for 10yr event Inflow = 1.92 cfs @ 12.04 hrs, Volume= 0.077 of Outflow = 1.85 cfs @ 12.07 hrs, Volume= 0.077 af, Atten= 4 %, Lag= 1.9 min Routing by Stor- Ind +Trans method, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Max. Velocity= 3.35 fps, Min. Travel Time= 1.1 min Avg. Velocity = 1.10 fps, Avg. Travel Time= 3.5 min Peak Storage= 131 cf @ 12.05 hrs Average Depth at Peak Storage= 0.16' Bank -Full Depth= 2.00' Flow Area= 22.0 sf, Capacity= 306.66 cfs 3.00' x 2.00' deep channel, n= 0.030 Side Slope Z- value= 4.07' Top Width= 19.00' Length= 230.0' Slope= 0.0674'/' Inlet Invert= 965.50', Outlet Invert= 950.00' E. U 3 0 LL Reach 8R: swale Hydrograph Inflow Area =0.396 ac Avg. Flow Depth =0.16' Time (hours) Max Vet =3.35 fps n =0.030 L= 230.0' S=0.0674'/' Capacity= 306.66 cfs Inflow Outflow Boat Landing Type 1124 -hr 10yr Rainfall = 4.20" Prepared by HP Printed 7/7/2014 HydroCAD ®10.00 s/n 00883 © 2012 HydrOCAD Software Solutions LLC Paae 28 Summary for Reach 1OR: to Minnewashta PROPOSED Inflow Area = 2.697 ac, 47.31% Impervious, Inflow Depth > 1.71" for 10yr event Inflow = 4.85 cfs @ 12.08 hrs, Volume= 0.383 of Outflow = 4.85 cfs @ 12.08 hrs, Volume= 0.383 af, Atten= 0 %, Lag= 0.0 min Routing by Stor- Ind +Trans method, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs u 3 0 LL Reach 10R: to Minnewashta PROPOSED Hydrograph 5 _ 4 3 2 1 01 1 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 21 Time (hours) Inflow — Outflow Boat Landing Type 11 24 -hr 10yr Rainfall = 4.20" Prepared by HP Printed 7/7/2014 HydroCAD ®10.00 s/n 00883 @ 2012 HydroCAD Software Solutions LLC Page 29 Summary for Pond 1 P: Rain Garden Inflow Area = 0.396 ac, 94.44% Impervious, Inflow Depth > 3.48" for 10yr event Inflow = 2.01 cfs @ 12.01 hrs, Volume= 0.115 of Outflow = 1.93 cfs @ 12.04 hrs, Volume= 0.084 af, Atten= 4 %, Lag= 1.8 min Discarded = 0.01 cfs @ 12.04 hrs, Volume= 0.007 of Primary = 1.92 cfs @ 12.04 hrs, Volume= 0.077 of Routing by Stor -Ind method, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Peak Elev= 965.28' @ 12.04 hrs Surf.Area= 0.026 ac Storage= 0.037 of Plug -Flow detention time= 110.6 min calculated for 0.084 of (73% of inflow) Center -of -Mass det. time= 49.3 min ( 790.5 - 741.2 ) Volume Invert Avail.Storage Storage Description #1 963.00' 0.059 of Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (acres) (acre -feet) (acre -feet) 963.00 0.009 0.000 0.000 964.00 0.015 0.012 0.012 965.00 0.022 0.018 0.030 966.00 0.035 0.028 0.059 Device Routing Invert Outlet Devices #1 Primary 965.00' 5.0' long x 2.0' breadth Broad - Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 3.50 Coef. (English) 2.54 2.61 2.61 2.60 2.66 2.70 2.77 2.89 2.88 2.85 3.07 3.20 3.32 #2 Discarded 963.00' 0.300 in /hr Exfiltration over Surface area Discarded OutFlow Max =0.01 cfs @ 12.04 hrs HW= 965.28' (Free Discharge) 2= Exfiltration (Exfiltration Controls 0.01 cfs) Primary OutFlow Max =1.88 cfs @ 12.04 hrs HW= 965.28' (Free Discharge) '11= Broad - Crested Rectangular Weir(Weir Controls 1.88 cfs @ 1.35 fps) Boat Landing Type// 24 -hr 10yr Rainfall = 4.20" Prepared by HP Printed 7/7/2014 HydroCADO 10.00 s/n 00883 © 2012 HydroCAD Software Solutions LLC Page 30 u 3 0 LL Pond 1P: Rain Garden Hydrograph 2.01 cfs 2- L11.92 cfs Inflow Area =0.396 ac Peak Elev= 965.28' Storage =0.037 of 1 0 1 cfs 0 5 6 7 8 9 10 11 12 13 14 15 18 17 18 19 20 Time (hours) — Inflow — Outflow — Discarded — Primary Boat Landing Prepared by HP Type// 24 -hr 10yr Rainfall = 4.20" Printed 7/7/2014 Summary for Pond 2P: Rain Garden w/ Yard Drain Inflow Area = 1.426 ac, 76.72% Impervious, Inflow Depth > 2.55" for 10yr event Inflow = 5.98 cfs @ 12.03 hrs, Volume= 0.303 of Outflow = 5.98 cfs @ 12.04 hrs, Volume= 0.291 af, Atten= 0 %, Lag= 0.6 min Discarded = 0.00 cfs @ 12.04 hrs, Volume= 0.004 of Primary = 5.97 cfs @ 12.04 hrs, Volume= 0.287 of Secondary = 0.00 cfs @ 5.00 hrs, Volume= 0.000 of Routing by Stor -Ind method, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Peak Elev= 949.91' @ 12.04 hrs Surf.Area= 0.015 ac Storage= 0.018 of Plug -Flow detention time= 25.1 min calculated for 0.291 of (96% of inflow) Center -of -Mass det. time= 9.8 min ( 785.8 - 776.0 ) Volume Invert Avail.Storage Storage Description #1 948.00' 0.039 of Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (acres) (acre -feet) (acre -feet) 948.00 0.004 0.000 0.000 949.00 0.009 0.006 0.006 950.00 0.016 0.012 0.019 951.00 0.024 0.020 0.039 Device Routing Invert Outlet Devices #1 Primary 946.00' 15.0" Round Culvert L= 71.0' Ke= 0.500 Inlet / Outlet Invert= 946.00'1945.00' S= 0.0141 T Cc= 0.900 n= 0.014, Flow Area= 1.23 sf #2 Secondary 950.30' 20.0' long x 20.0' breadth Broad - Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63 #3 Device 1 949.50' 27.0" Horiz. Orifice /Grate C= 0.600 Limited to weir flow at low heads #4 Discarded 948.00' 0.300 in /hr Exfiltration over Surface area Qiscarded OutFlow Max =0.00 cfs @ 12.04 hrs HW= 949.90' (Free Discharge) r-- 4= Exf11ltration ( Exfiltration Controls 0.00 cfs) Primary OutFlow Max =5.84 cfs @ 12.04 hrs HW= 949.90' (Free Discharge) t1=Culvert (Passes 5.84 cfs of 10.17 cfs potential flow) 3= Orifice /Grate (Weir Controls 5.84 cfs @ 2.07 fps) L condary OutFlow Max =0.00 cfs @ 5.00 hrs HW= 948.00' (Free Discharge) = Broad - Crested Rectangular Weir( Controls 0.00 cfs) Boat Landing Type 1124-hr 10yr Rainfall = 4.20" Prepared by HP Printed 7/7/2014 HydroCAD® 10.00 s/n 00883 © 2012 HydroCAD Software Solutions LLC Page 32 N U 3 O LL Pond 2P: Rain Garden w/ Yard Drain Hydrograph T — Inflow — Outflow — Discarded Inflow Area =1.426 ac -Primary — Secondary Peak Elev= 949.91' Time (hours) Storage =0.018 of Boat Landing Type 1124 -hr 10yr Rainfall= 4.20" Prepared by HP Printed 7/7/2014 HydrOCAD@ 10.00 s/n 00883 @ 2012 HvdroCAD Software Solutions LLC Paae 33 Summary for Pond 4P: Stormwater Basin Inflow Area = 1.735 ac, 64.21 % Impervious, Inflow Depth > 2.15" for 10yr event Inflow = 6.42 cfs @ 12.04 hrs, Volume= 0.311 of Outflow = 3.42 cfs @ 12.18 hrs, Volume= 0.304 af, Atten= 47 %, Lag= 8.4 min Primary = 3.42 cfs @ 12.18 hrs, Volume= 0.304 of Secondary = 0.00 cfs @ 5.00 hrs, Volume= 0.000 of Routing by Stor -Ind method, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Starting Elev= 946.00' Surf.Area= 0.045 ac Storage= 0.034 of Peak Elev= 947.37' @ 12.17 hrs Surf.Area= 0.070 ac Storage= 0.114 of (0.080 of above start) Plug -Flow detention time= 68.3 min calculated for 0.270 of (87% of inflow) Center -of -Mass det. time= 16.0 min ( 804.1 - 788.1 ) Volume Invert Avail.Storage Storage Description #1 945.00' 0.245 of Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (acres) (acre -feet) (acre -feet) 945.00 0.023 0.000 0.000 946.00 0.045 0.034 0.034 947.00 0.066 0.055 0.089 948.00 0.078 0.072 0.161 949.00 0.090 0.084 0.245 Device Routing Invert Outlet Devices #1 Primary 946.00' 12.0" Round Culvert L= 100.0' Ke= 0.500 Inlet/ Outlet Invert= 946.00'/ 945.00' S=0.0100'/' Cc= 0.900 n=0.013, Flow Area= 0.79 sf #2 Secondary 948.50' 10.0' long x 10.0' breadth Broad - Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64 Primary OutFlow Max =3.41 cfs @ 12.18 hrs HW= 947.36' (Free Discharge) t1= Culvert (Barrel Controls 3.41 cfs @ 4.34 fps) Secondary OutFlow Max =0.00 cfs @ 5.00 hrs HW= 946.00' (Free Discharge) 2= Broad- Crested Rectangular Weir( Controls 0.00 cfs) Boat Landing Prepared by HP 0 LL Type 1124 -hr 10yr Rainfall = 4.20" Printed 7/7/2014 Pond 4P: Stormwater Basin Hydrograph Inflow Area =1.735 ac Time (hours) Peak Elev= 947.37' Storage =0.114 of 20 — Inflow — Outflow — Pnmary — Secondary Boat Landing Prepared by HP Summary for Pond 7P: Type 1124 -hr 10yr Rainfall = 4.20" Printed 7/7/2014 Inflow Area = 0.162 ac,100.00% Impervious, Inflow Depth > 3.65" for 10yr event Inflow = 0.84 cfs @ 12.01 hrs, Volume= 0.049 of Outflow = 0.79 cfs @ 12.05 hrs, Volume= 0.032 af, Atten= 5 %, Lag= 2.4 min Discarded = 0.01 cfs @ 12.05 hrs, Volume= 0.007 of Primary = 0.79 cfs @ 12.05 hrs, Volume= 0.025 of Routing by Stor -Ind method, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Peak Elev= 952.60' @ 12.05 hrs Surf.Area= 0.029 ac Storage= 0.020 of Plug -Flow detention time= 131.3 min calculated for 0.032 of (65% of inflow) Center -of -Mass det. time= 60.1 min ( 794.1 - 734.0 ) Volume Invert Avail.Storage Storage Description #1 951.00' 0.089 of Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc,Store Cum.Store (feet) (acres) (acre -feet) (acre -feet) 951.00 0.005 0.000 0.000 952.00 0.011 0.008 0.008 953.00 0.040 0.025 0.033 954.00 0.070 0.055 0.089 Device Routing Invert Outlet Devices #1 Primary 952.50' 10.0' long x 5.0' breadth Broad - Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 3.50 4.00 4.50 5.00 5.50 Coef. (English) 2.34 2.50 2.70 2.68 2.68 2.66 2.65 2.65 2.65 2.65 2.67 2.66 2.68 2.70 2.74 2.79 2.88 #2 Discarded 951.00' 0.300 in /hr Exfiltration over Surface area Discarded OutFlow Max =0.01 cfs @ 12.05 hrs HW= 952.60' (Free Discharge) 2= Exfiltration (Exfiltration Controls 0.01 cfs) Primary OutFlow Max =0.77 cfs @ 12.05 hrs HW= 952.60' (Free Discharge) L1= 13road - Crested Rectangular Weir(Weir Controls 0.77 cfs @ 0.75 fps) Boat Landing Type// 24 -hr 10yr Rainfall= 4.20" Prepared by HP Printed 7/7/2014 HydroCADO 10.00 s/n 00883 02012 HydroCAD Software Solutions LLC Paae 36 3 0 LL Pond 7P: Hydrograph Time (hours) — Inflow — Outflow — Discarded — Primary Boat Landing Type /124 -hr 100yr Rainfall =6.00" Prepared by HP Printed 7/7/2014 HydroCADO 10.00 s/n 00883 © 2012 HydroCAD Software Solutions LLC Paae 37 Time span =5.00 -20.00 hrs, dt =0.05 hrs, 301 points Runoff by SCS TR -20 method, UH =SCS Reach routing by Stor- Ind +Trans method - Pond routing by Stor -Ind method Subcatchment3S: Runoff Area =0.396 ac 94.44% Impervious Runoff Depth >5.12" Tc =10.0 min CN =96 Runoff =2.91 cfs 0.169 of Subcatchment5S: Runoff Area =1.030 ac 69.90% Impervious Runoff Depth >4.23" Tc =10.0 min CN =87 Runoff =6.74 cfs 0.363 at Subcatchment6S: Runoff Area =0.309 ac 6.47% Impervious Runoff Depth >1.97" Tc =10.0 min CN =63 Runoff =1.00 cfs 0.051 at Subcatchment8S: Runoff Area =0.162 ac 100.00% Impervious Runoff Depth >5.27" Tc =10.0 min CN =98 Runoff= 1.21 cfs 0.071 ai Subcatchment9S: Existing Boat Launch Runoff Area =2.697 ac 0.00% Impervious Runoff Depth >2.84" Tc =10.0 min CN =73 Runoff =12.62 cfs 0.639 of Subcatchment 10S: north boat launch - Runoff Area =0.800 ac 0.00% Impervious Runoff Depth >1.81" Tc =10.0 min CN =61 Runoff =2.38 cfs 0.121 of Reach 8R: swale Avg. Flow Depth =0.19' Max Vet =3.79 fps Inflow =2.80 cfs 0.131 of n =0.030 L= 230.0' S= 0.0674'/' Capacity = 306.66 cfs Outflow =2.71 cfs 0.131 of Reach 1 OR: to Minnewashta PROPOSED Inflow =7.43 cfs 0.687 of Outflow =7.43 cfs 0.687 of Pond 1P: Rain Garden Peak Elev= 965.36' Storage =0.039 of Inflow =2.91 cfs 0.169 of Discarded =0.01 cfs 0.007 of Primary=2.80 cfs 0.131 of Outflow =2.81 cfs 0.138 of Pond 2P: Rain Garden w/ Yard Drain Peak EIev= 950.04' Storage =0.020 of Inflow =9.23 cfs 0.494 of Discarded =0.00 cfs 0.004 of Primary=9.22 cfs 0.477 of Secondary=0.00 cfs 0.000 of Outflow =9.22 cfs 0.482 of Pond 4P: Stormwater Basin Peak EIev= 948.27' Storage =0.183 of Inflow =10.22 cfs 0.528 of Primary=4.41 cfs 0.520 of Secondary=0.00 cfs 0.000 of Outflow =4.41 cfs 0.520 of Pond 7P: Peak Elev= 952.63' Storage =0.021 of Inflow =1.21 cfs 0.071 of Discarded =0.01 cfs 0.007 of Primary=1.15 cfs 0.047 of Outflow =1.16 cfs 0.054 of Total Runoff Area = 5.394 ac Runoff Volume = 1.413 of Average Runoff Depth = 3.14" 76.34% Pervious= 4.118 ac 23.66% Impervious= 1.276 ac Boat Landing Type 1124 -hr 100yr Rainfall = 6.00" Prepared by HP Printed 7/7/2014 HydroCAD ®10.00 s/n 00883 @ 2012 HvdroCAD Software Solutions LLC Page 38 Summary for Subcatchment 3S: Runoff = 2.91 cfs @ 12.01 hrs, Volume= 0.169 af, Depth> 5.12" Runoff by SCS TR -20 method, UH =SCS, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Type II 24 -hr 1 00y Rainfall= 6.00" Area (ac) CN Description 0.374 98 A non al 0.396 96 Weighted Average 0.022 5.56% Pervious Area 0.374 94.44% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.0 Direct Entry, N U 3 0 LL Subcatchment 3S: Hydrograph Type II 24 -hr 1 00y Rainfall= 6.00" Runoff Area =0.396 ac Runoff Volume =0.169 of Runoff Depth >5.12" 7 n 4 in it » is la ie Time (hours) Tc =10.0 min CN =96 —Runoff Boat Landing Type 1124 -hr 100yr Rainfall= 6.00" Prepared by HP Printed 7/7/2014 HydroCADO 10.00 s/n 00883 @ 2012 HydroCAD Software Solutions LLC Page 39 Summary for Subcatchment 5S: Runoff = 6.74 cfs @ 12.01 hrs, Volume= 0.363 af, Depth> 4.23" Runoff by SCS TR -20 method, UH =SCS, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Type II 24 -hr 1 00y Rainfall= 6.00" Area (ac) CN Description 0.720 98 n �4n cn 1.030 87 Weighted Average 0.310 30.10% Pervious Area 0.720 69.90% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.0 Direct Entry, N V 3 . LL Subcatchment 5S: Hydrograph Type II 24 -hr 100yr Rainfall =6.00" Runoff Area =1.030 ac Runoff Volume =0.363 of Runoff Depth >4.23" 7 x 4 M ii » is in is is Time (hours) Tc =10.0 min CN =87 —Runoff Boat Landing Prepared by HP Type 1124 -hr 100yr Rainfall= 6.00" Printed 7/7/2014 Summary for Subcatchment 6S: Runoff = 1.00 cfs @ 12.02 hrs, Volume= 0.051 af, Depth> 1.97' Runoff by SCS TR -20 method, UH =SCS, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Type II 24 -hr 1 00y Rainfall= 6.00" Area (ac) CN Description * 0.020 98 * 0.289 61 0.309 63 Weighted Average 0.289 93.53% Pervious Area 0.020 6.47% Impervious Area Tc Length 10.0 a U 3 0 LL 5 6 7 Description Direct Entry, Subcatchment 6S: Hydrograph Type II 24 -hr 100yr Rainfall= 6.00" Runoff Area =0.309 ac Runoff Volume =0.051 of Runoff Depth >1.97rr Tc =10.0 min CN =63 Time (hours) — RunoR Boat Landing Type 1124 -hr 100yr Rainfall =6.00" Prepared by HP Printed 7/7/2014 HydroCADO 10.00 s/n 00883 © 2012 HydroCAD Software Solutions LLC Paoe 41 Summary for Subcatchment 8S: Runoff = 1.21 cfs @ 12.01 hrs, Volume= 0.071 af, Depth> 5.27" Runoff by SCS TR -20 method, UH =SCS, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Type II 24 -hr 1 00y Rainfall= 6.00" Area (ac) CN Description 0.162 98 0.162 100.00% Impervious Area Tc Length Slope Velocity Capacity Description 10.0 Direct Entry, N `o 3 0 Subcatchment 8S: Hydrograph Type II 24 -hr 100yr Rainfall= 6.00rr Runoff Area =0.162 ac Runoff Volume =0.071 of rime (hours) Runoff Depth >5.27rr Tc =10.0 min CN =98 IF. L• j — Runoff Boat Landing Type 1124 -hr 100yr Rainfall = 6.00" Prepared by HP Printed 7/7/2014 HydroCADO 10.00 s/n 00883 © 2012 HydroCAD Software Solutions LLC Page 42 Summary for Subcatchment 9S: Existing Boat Launch Runoff = 12.62 cfs @ 12.02 hrs, Volume= 0.639 af, Depth> 2.84" Runoff by SCS TR -20 method, UH =SCS, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Type II 24 -hr 1 00y Rainfall= 6.00" Area (ac) CN Descriotion * 0.600 85 existing south parking lot 1.297 61 >75% Grass cover, Good, HSG B * 0.800 85 existing north parking lot 2.697 73 Weighted Average 2.697 100.00% Pervious Area Tc Length Description 10.0 Direct Entry, Subcatchment 9S: Existing Boat Launch Hydrograph — RunoR 12-. . - Type II 24 -hr 100yr Rainfall= 6.00" 9 Runoff Area =2.697 ac 3 Runoff Volume =0.639 of g Runoff Depth >2.84" LL 6 Tc =10.0 min 5 4 CN =73 3 12 13 14 Time (hours) Boat Landing Type 1124 -hr 100yr Rainfall = 6.00" Prepared by HP Printed 7/7/2014 HydroCADO 10.00 s/n 00883 @ 2012 HydroCAD Software Solutions LLC Page 43 Summary for Subcatchment 10S: north boat launch - gravel removed Runoff = 2.38 cfs @ 12.02 hrs, Volume= 0.121 af, Depth> 1.81" Runoff by SCS TR -20 method, UH =SCS, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Type II 24 -hr 1 00y Rainfall= 6.00" Area (ac) CN Description 0.800 61 0.800 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (fUsec) (cfs) 10.0 Direct Entry, N u 3 0 LL Subcatchment 10S: north boat launch - gravel removed Hydrograph Type II 24 -hr 100yr Rainfall= 6.00" Runoff Area =0.800 ac Runoff Volume =0.121 of Runoff Depth >1.81" Tc =10.0 min CN =61 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) — RunoH Boat Landing Type 1124 -hr 100yr Rainfall = 6.00" Prepared by HP Printed 7/7/2014 HydroCADO 10.00 s/n 00883 © 2012 HydroCAD Software Solutions LLC Pace 44 Summary for Reach 8R: swale Inflow Area = 0.396 ac, 94.44% Impervious, Inflow Depth > 3.97" for 1 00y event Inflow = 2.80 cfs @ 12.03 hrs, Volume= 0.131 of Outflow = 2.71 cfs @ 12.06 hrs, Volume= 0.131 af, Atten= 3 %, Lag= 1.6 min Routing by Stor- Ind +Trans method, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Max. Velocity= 3.79 fps, Min. Travel Time= 1.0 min Avg. Velocity = 1.22 fps, Avg. Travel Time= 3.2 min Peak Storage= 169 cf @ 12.05 hrs Average Depth at Peak Storage= 0.19' Bank -Full Depth= 2.00' Flow Area= 22.0 sf, Capacity= 306.66 cfs 3.00' x 2.00' deep channel, n= 0.030 Side Slope Z- value= 4.07' Top Width= 19.00' Length= 230.0' Slope= 0.0674 '/' Inlet Invert= 965.50', Outlet Invert= 950.00' F. 3 0 LL Reach 8R: swale Hydrograph Inflow Area =0.396 ac Avg. Flow Depth =0.19' Max Vet =3.79 fps n =0.030 L= 230.0' S=0.0674'/' Capacity= 306.66 cfs 5 6 7 R 9 in 11 19 13 1d 15 is 17 1A 19 9 Time (hours) Inflow Outflow Boat Landing Prepared by HP Type 1124 -hr 100yr Rainfall = 6.00" Printed 7/7/2014 Summary for Reach 1OR: to Minnewashta PROPOSED Inflow Area = 2.697 ac, 47.31% Impervious, Inflow Depth > 3.06" for 100yr event Inflow = 7.43 cfs @ 12.05 hrs, Volume= 0.687 of Outflow = 7.43 cfs @ 12.05 hrs, Volume= 0.687 af, Atten= 0 %, Lag= 0.0 min Routing by Stor- Ind +Trans method, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs N V 3 O LL Reach 10R: to Minnewashta PROPOSED Hydrograph Inflow Area =2.697 ac rime (hours) Inflow Outflow Boat Landing Type 1124 -hr 100yr Rainfall =6.00" Prepared by HP Printed 7/7/2014 HydroCAD ®10.00 s/n 00883 © 2012 HydroCAD Software Solutions LLC Pace 46 Summary for Pond 1 P: Rain Garden Inflow Area = 0.396 ac, 94.44% Impervious, Inflow Depth > 5.12" for 100yr event Inflow = 2.91 cfs @ 12.01 hrs, Volume= 0.169 of Outflow = 2.81 cfs @ 12.03 hrs, Volume= 0.138 af, Atten= 3 %, Lag= 1.7 min Discarded = 0.01 cfs @ 12.03 hrs, Volume= 0.007 of Primary = 2.80 cfs @ 12.03 hrs, Volume= 0.131 of Routing by Stor -Ind method, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Peak Elev= 965.36' @ 12.03 hrs Surf.Area= 0.027 ac Storage= 0.039 of Plug -Flow detention time= 95.3 min calculated for 0.138 of (82% of inflow) Center -of -Mass det. time= 43.4 min ( 780.3 - 736.9 ) Volume Invert Avail.Storage Storage Description #1 963.00' 0.059 of Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (acres) (acre -feet) (acre -feet) 963.00 0.009 0.000 0.000 964.00 0.015 0.012 0.012 965.00 0.022 0.018 0.030 966.00 0.035 0.028 0.059 Invert Outlet Devices #1 Primary 965.00' 5.0' long x 2.0' breadth Broad - Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 3.50 Coef. (English) 2.54 2.61 2.61 2.60 2.66 2.70 2.77 2.89 2.88 2.85 3.07 3.20 3.32 #2 Discarded 963.00' 0.300 in /hr Exfiltration over Surface area Discarded OutFlow, Max =0.01 cfs @ 12.03 hrs HW= 965.35' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.01 cfs) Primary OutFlow Max =2.74 cfs @ 12.03 hrs HW= 965.35' (Free Discharge) L1= 113road - Crested Rectangular Weir(Weir Controls 2.74 cfs @ 1.54 fps) Boat Landing Type 1124 -hr 100yr Rainfall = 6.00" Prepared by HP Printed 7/7/2014 HydroCADO 10.00 s/n 00883 © 2012 HydroCAD Software Solutions LLC Page 47 N U Pond 1P: Rain Garden Hydrograph Time (hours) — Inflow — Outflow — Discarded — Primary Boat Landing Type 1124-hr 100yr Rainfall =6.00" Prepared by HP Printed 7/7/2014 HydroCAD®10.00 s/n 00883 © 2012 HydroCAD Software Solutions LLC Page 48 Summary for Pond 21P: Rain Garden w/ Yard Drain Inflow Area = 1.426 ac, 76.72% Impervious, Inflow Depth > 4.16" for 1 00y event Inflow = 9.23 cfs @ 12.02 hrs, Volume= 0.494 of Outflow = 9.22 cfs @ 12.03 hrs, Volume= 0.482 af, Atten= 0 %, Lag= 0.6 min Discarded = 0.00 cfs @ 12.03 hrs, Volume= 0.004 of Primary = 9.22 cfs @ 12.03 hrs, Volume= 0.477 of Secondary = 0.00 cfs @ 5.00 hrs, Volume= 0.000 of Routing by Stor -Ind method, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Peak Elev= 950.04'@ 12.03 hrs Surf.Area= 0.016 ac Storage= 0.020 of Plug -Flow detention time= 18.3 min calculated for 0.482 of (98% of inflow) Center -of -Mass det. time= 8.5 min ( 774.1 - 765.6 ) Volume Invert Avail.Storage Storage Description #1 948.00' 0.039 of Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (acres) (acre -feet) (acre -feet) 948.00 0.004 0.000 0.000 949.00 0.009 0.006 0.006 950.00 0.016 0.012 0.019 951.00 0.024 0.020 0.039 Device Routing Invert Outlet Devices #1 Primary 946.00' 15.0" Round Culvert L= 71.0' Ke= 0.500 Inlet / Outlet Invert= 946.00'/ 945.00' S= 0.0141 T Cc= 0.900 n= 0.014, Flow Area= 1.23 sf #2 Secondary 950.30' 20.0' long x 20.0' breadth Broad - Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63 #3 Device 1 949.50' 27.0" Horiz. Orifice /Grate C= 0.600 Limited to weir flow at low heads #4 Discarded 948.00' 0.300 in /hr Exfiltration over Surface area Discarded OutFlow Max =0.00 cfs @ 12.03 hrs HW= 950.03' (Free Discharge) t 4= Exfiltration (Exfiltration Controls 0.00 cfs) Primary OutFlow Max =9.00 cfs @ 12.03 hrs HW= 950.03' (Free Discharge) L1=Culvert (Passes 9.00 cfs of 10.36 cfs potential flow) 3= 0rifice /Grate (Weir Controls 9.00 cfs @ 2.39 fps) Secondary OutFlow Max =0.00 cfs @ 5.00 hrs HW= 948.00' (Free Discharge) 2= Broad - Crested Rectangular Weir( Controls 0.00 cfs) Boat Landing Type 1124-hr 100yr Rainfall = 6.00" Prepared by HP Printed 7/712014 HydroCADO 10.00 s/n 00883 0 2012 HydroCAD Software Solutions LLC Page 49 3 0 LL Pond 2P: Rain Garden w/ Yard Drain Hydrograph 2 c{s — Inflow — Outflow — Discarded Inflow Area =1.426 ac -Primary F — Secondary Peak Elev= 950.04' Time (hours) Storage =0.020 of Boat Landing Prepared by HP Type 1124 -hr 100yr Rainfall= 6.00" Printed 7/7/2014 Summary for Pond 4P: Stormwater Basin Inflow Area = 1.735 ac, 64.21 % Impervious, Inflow Depth > 3.65" for 1 00y event Inflow = 10.22 cfs @ 12.03 hrs, Volume= 0.528 of Outflow = 4.41 cfs @ 12.19 hrs, Volume= 0.520 af, Atten= 57 %, Lag= 9.5 min Primary = 4.41 cfs @ 12.19 hrs, Volume= 0.520 of Secondary = 0.00 cfs @ 5.00 hrs, Volume= 0.000 of Routing by Stor -Ind method, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Starting Elev= 946.00' Surf.Area= 0.045 ac Storage= 0.034 of Peak Elev= 948.27' @ 12.19 hrs Surf.Area= 0.081 ac Storage= 0.183 of (0.149 of above start) Plug -Flow detention time= 54.5 min calculated for 0.484 of (92% of inflow) Center -of -Mass det. time= 17.7 min ( 794.7 - 777.0 ) Volume Invert Avail.Storage Storage Description #1 945.00' 0.245 of Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (acres) (acre -feet) (acre -feet) 945.00 0.023 0.000 0.000 946.00 0.045 0.034 0.034 947.00 0.066 0.055 0.089 948.00 0.078 0.072 0.161 949.00 0.090 0.084 0.245 Device Routing Invert Outlet Devices #1 Primary 946.00' 12.0" Round Culvert L= 100.0' Ke= 0.500 Inlet/ Outlet Invert= 946.00'/ 945.00' S=0.0100? Cc= 0.900 n=0.013, Flow Area= 0.79 sf #2 Secondary 948.50' 10.0' long x 10.0' breadth Broad - Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64 Primary OutFlow Max =4.40 cfs @ 12.19 hrs HW= 948.27' (Free Discharge) t1= Culvert (Barrel Controls 4.40 cfs @ 5.61 fps) tecondary OutFlow Max =0.00 cfs @ 5.00 hrs HW= 946.00' (Free Discharge) = Broad - Crested Rectangular Weir( Controls 0.00 cfs) Boat Landing Type 1124 -hr 100yr Rainfall= 6.00" Prepared by HP Printed 7/7/2014 HydroCADO 10.00 s/n 00883 © 2012 HydroCAD Software Solutions LLC Page 51 Pond 4P: Stormwater Basin Hydrograph F--1 nflow T — Outflow 0 Inflow Area =1.735 ac = Secmondary 9 6 Peak Elev= 948.27' Storage =0.183 of r 4, 6 3 al 5 1 5 6 7 8 9 10 11 12 13 14 Time (hours) Boat Landing Type// 24 -hr 100yr Rainfall =6.00" Prepared by HP Printed 7/7/2014 HydroCAD ®10.00 s/n 00883 @ 2012 HydroCAD Software Solutions LLC Page 52 Summary for Pond 7P: Inflow Area = 0.162 ac,100.00% Impervious, Inflow Depth > 5.27" for 100yr event Inflow = 1.21 cfs @ 12.01 hrs, Volume= 0.071 of Outflow = 1.16 cfs @ 12.03 hrs, Volume= 0.054 af, Atten= 4 %, Lag= 1.7 min Discarded = 0.01 cfs @ 12.03 hrs, Volume= 0.007 of Primary = 1.15 cfs @ 12.03 hrs, Volume= 0.047 of Routing by Stor -Ind method, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Peak Elev= 952.63'@ 12.03 hrs Surf.Area= 0.029 ac Storage= 0.021 of Plug -Flow detention time= 110.1 min calculated for 0.054 of (76% of inflow) Center -of -Mass det. time= 51.0 min ( 783.0 - 732.1 ) Volume Invert Avail.Storage Storage Description #1 951.00' 0.089 of Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (acres) (acre -feet) (acre -feet) 951.00 0.005 0.000 0.000 952.00 0.011 0.008 0.008 953.00 0.040 0.025 0.033 954.00 0.070 0.055 0.089 Device Routing Invert Outlet Devices #1 Primary 952.50' 10.0' long x 5.0' breadth Broad - Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 3.50 4.00 4.50 5.00 5.50 Coef. (English) 2.34 2.50 2.70 2.68 2.68 2.66 2.65 2.65 2.65 2.65 2.67 2.66 2.68 2.70 2.74 2.79 2.88 #2 Discarded 951.00' 0.300 in /hr Exfiltration over Surface area Discarded OutFlow Max =0.01 cfs @ 12.03 hrs HW= 952.63' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.01 cfs) Primary OutFlow Max =1.12 cfs @ 12.03 hrs HW= 952.63' (Free Discharge) t1= 13road - Crested Rectangular Weir(Weir Controls 1.12 cfs @ 0.85 fps) Boat Landing Type 1124 -hr 100yr Rainfall =6.00" Prepared by HP Printed 7/7/2014 HydroCAD®10.00 s/n 00883 © 2012 HydroCAD Software Solutions LLC Page 53 N U 3 0 LL Pond 7P: Hydrograph Time (hours) Inflow Outflow — Discarded — Primary CITY OF CHANHASSEN AFFIDAVIT OF MAILING NOTICE STATE OF MINNESOTA) ) ss. COUNTY OF CARVER ) I, Karen J. Engelhardt, being first duly sworn, on oath deposes that she is and was on August 7, 2014, the duly qualified and acting Deputy Clerk of the City of Chanhassen, Minnesota; that on said date she caused to be mailed a copy of the attached notice of Public Hearing for Minnewashta Regional Park Wetland Alteration Permit — Planning Case 2014- 23 to the persons named on attached Exhibit "A ", by enclosing a copy of said notice in an envelope addressed to such owner, and depositing the envelopes addressed to all such owners in the United States mail with postage fully prepaid thereon; that the names and addresses of such owners were those appearing as such by the records of the County Treasurer, Carver County, Minnesota, and by other appropriate records. Subscribed and sworn to before me this 944'-. day of 12014. Notary Publi Karen . Enge ar , Deputy ierk if L�trY . VE l SSEN PubIic��innes ota � P1res J" 31, 2015 O) C N d M M O C 'N d E �? 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R ABD CONSULTING SERVICES ANTHONY J MILLER BENJAMIN H & HIDEKO GOWEN PO BOX 1F 1543 SPRUCE PT 6440 HAZELTINE BLVD MINNETONKA, MN 55345 -0001 VICTORIA, MN 55386 -9584 EXCELSIOR, MN 55331 -8049 BRADLEY A FERGUSON BRIAN D HARSTAD CHRIS MOSER 863 RAVOUX CIR 6786 HIGHOVER DR 2762 PIPER RIDGE LN CHASKA, MN 55318 -2406 CHANHASSEN, MN 55317 -7580 EXCELSIOR, MN 55331 -7803 CHRISTOPHER C FITCH CORY S ZAFKE DAVID E & KATHLEEN K 6814 HIGHOVER DR 7030 HIGHOVER DR FULKERSON 6900 CHANHASSEN, MN 55317 -7568 CHANHASSEN, MN 55317 -7572 CHANHASSEN, HIGHOVER DR CHANHASSEN, MN 55317 -7567 DENNIS M & JOAN E CLARK E JEROME CARLSON IND SCHOOL DIST 276 6651 HAZELTINE BLVD PO BOX 554 5621 COUNTY ROAD 101 EXCELSIOR, MN 55331 -8039 WAYZATA, MN 55391 -0554 MINNETONKA, MN 55345 -4214 IVY FAY WILSON JEFFREY MARK ANDERSON JOHN J COPOULS 2742 PIPER RIDGE LN 6840 HAZELTINE BLVD 6810 HIGHOVER DR EXCELSIOR, MN 55331 -7803 EXCELSIOR, MN 55331 -8030 CHANHASSEN, MN 55317 -7568 JOSEPH P THULL KATHLEEN E MACK KRISTOPHER M GRIESE 6872 HIGHOVER DR 6984 HIGHOVER DR 6800 HIGHOVER DR CHANHASSEN, MN 55317 -7568 CHANHASSEN, MN 55317 -7567 CHANHASSEN, MN 55317 -7568 LEE S & RHONDA L BROADSTON MICHAEL MATTHIAS MICHAEL P & TERRI A MASON 6918 HIGHOVER DR 7014 HIGHOVER DR 2711 PIPER RIDGE LN CHANHASSEN, MN 55317 -7567 CHANHASSEN, MN 55317 -7572 EXCELSIOR, MN 55331 -7803 PATRICK J & LISA M MCNULTY PAUL L ASAO PHONG M LUONG 6842 HIGHOVER DR 6934 HIGHOVER DR 6856 HIGHOVER DR CHANHASSEN, MN 55317 -7568 CHANHASSEN, MN 55317 -7567 CHANHASSEN, MN 55317 -7568 PING CHUNG RICHARD E & KIMBERLY TENNYSON RICHARD E & SUSAN K ATWOOD 7000 HIGHOVER DR 2722 PIPER RIDGE LN 2701 PIPER RIDGE LN CHANHASSEN, MN 55317 -7572 EXCELSIOR, MN 55331 -7803 EXCELSIOR, MN 55331 -7803 WADE & THERESA A MOLNAU WILLIAM & BARBARA JOHNSON REV WILLIAM D & MARY D HAWORTH 6888 HIGHOVER DR 7060 CHES MAR DR 6818 HIGHOVER DR CHANHASSEN, MN 55317 -7568 EXCELSIOR, MN 55331 -8833 CHANHASSEN, MN 55317 -7568 CARVER COUNTY PARKS -MARTY WALSH 11360 HWY 212 STE 2 COLOGNE, MN 55322 A WSB engineering -planning • environmental • construction 701 Xenia Avenue South Suite 300 Minneapolis, MN 55416 Tel: 763 - 5414800 Fax: 763 - 541 -1700 Memorandum To: Krista Spreiter, City of Chanhassen Terry Jeffery, City of Chanhassen Melissa Jenny, US Corps of Engineers Copy: Marty Walsh, Carver County Morgan Dawley, WSB & Associates Melissa Jenny, US Corps of Engineers Ben Meyer, BWSR Jennie Skancke, DNR Brooke Haworth, DNR Mike Wanous, Carver SWCD From: Andi Moffatt, WSB & Associates Date: August 26, 2014 Re: Carver County Lake Minnewashta Regional Park Improvements Additional Wetland Impact WSB Project No. 1945 -050 Attached, please find a revised wetland impact figure for the Lake Minnewashta Regional Park project. A permit application for wetland impacts was submitted to the City as the LGU and to the US Corps of Engineers on July 22, 2014. While the plans have not changed, we discovered some additional WCA impact above the OHW of Lake Minnewashta associated with the boat launch and storm sewer outfall. This adds 806 sf of additional impact. This area is currently the boat launch area and consists of the sand and gravel area of the launch with some vegetation adjacent to the launch area. Wetland impacts will be mitigated through the purchase of wetland credits via the same wetland bank proposed. If you have any questions or need additional information, please feel free to call me at 763 - 287 -7196. Equal Opportunity Employer wsbeng.com K:NI 945LRWLmmVennitsWEMO- 082614- weaMaA Moo tt. a � z\ - i 2 O � O n R ma. o // °m� ny Z =z Z o =z F 0 �•♦ m `� �I sae y2 0 0 \ ♦ i � � F S 94> 5 , ti • 1 �♦ �z ��56 90� ' 1 ♦ 5 49 j J♦ � ♦ \ TZ �II l ♦1 D 1 ♦� I Ili I s� r -�:�, i.E,, oA i B8` II SSS 9 ti I B 953 / 67 t„(' 95e 1 ssn � 955 1 98g 1 958 959 / � N I ' 96 �z 96� / y O I ss G 961 s 964 / 98$ t 4 �b NC (L4 1 � 4 4 m� \ �w A m LAKE MINNEWASHTA REGIONAL PARK W3B 2014 PARK IMPROVEMENT PROJECT CARVER COUNTY, MINNESOTA °"