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PC Staff ReportCITY OF CHANHASSEN PC DATE: July 19, 2016 CC DATE: July 25, 2016 REVIEW DEADLINE: August 16, 2016 CASE #: 2016-18 BY: RG, JM, TJ, ML, JS, SS SUMMARY OF REQUEST: Site Plan Review for a 26,962 square foot building expansion. LOCATION: 8303 Audubon Road APPLICANT: Eden Trace Corp. Owner: Equitable Holding Co. LLC. 8156 Mallory Court 7667 Equitable Drive Chanhassen, MN 55317 Eden Prairie, MN 55344 (952) 361-0722 mark@edentrace.com PRESENT ZONING: Industrial Office Park (IOP) 2020 LAND USE PLAN: Office Industrial ACREAGE: 6.26 acres DENSITY: 0.34 F.A.R. LEVEL OF CITY DISCRETION IN DECISION- MAKING: The city’s discretion in approving or denying a site plan is limited to whether or not the proposed project complies with Zoning Ordinance requirements. If it meets those standards, the city must then approve the site plan. This is a quasi-judicial decision. Notice of this public hearing has been mailed to all property owners within 500 feet. PROPOSAL/SUMMARY The applicant is proposing a 26,952 square foot expansion to the existing building. PROPOSED MOTION: “The Chanhassen Planning Commission recommends approval of the site plan for the expansion of IDI Distribution Building, plans prepared by Houwman Architects, dated June 6, 2016, and Sambatek, dated July 1, 2016, subject to the conditions of the staff report and adopts the findings of fact and recommendation.” Planning Commission IDI Expansion – Planning Case 2016-18 July 19, 2016 Page 2 of 16 APPLICABLE REGULATIONS Chapter 20, Article II, Division 6, Site Plan Review Chapter 20, Article VI, Wetland Protection Chapter 20, Article XXII, “IOP” Industrial Office Park District Chapter 20, Article XXIII, Division 7, Design Standards for Commercial, Industrial and Office- Institutional Developments BACKGROUND On April 14, 2008, the Chanhassen City Council approved the following: Subdivision (preliminary and final plat) creating one lot and one outlot and right-of-way for Audubon Road; Site Plan for IDI Distributors for a 71,500 square-foot, two-story, office-warehouse building to be built in two phases (55,200 square-foot initially with a future 16,272 square-foot expansion); and Wetland Alteration Permit for the grading and filling of wetlands on the site. On July 10, 1989, the Chanhassen City Council approved CUP #89-2 permitting a landscaping contractor’s yard at 8301 Audubon Road. On July 25, 1988, the Chanhassen City Council approved a site plan for an office/warehouse building for Merit Heating and Cooling. The applicant subsequently withdrew the proposal prior to development on the site. The site was used as a single-family residence with a horse barn and horse pasture. SITE PLAN REVIEW Site Plan Review for a 26,962 square foot main level building expansion for property zoned Industrial Office Park (IOP) located at 8303 Audubon Road. Water and sewer service is available to the site from Audubon Road. Access to the site will be from Audubon Road for automobiles and Lake Drive West for semi-trailers. Access will be via a shared private street (driveway). Planning Commission IDI Expansion – Planning Case 2016-18 July 19, 2016 Page 3 of 16 Wetland complexes are located in the northeast and east central portions of the property. These wetlands extend on to the property to the east. The site’s high point at 962 is located in the northwest portion of the property slopes to the north toward the railroad with an elevation of 935, to the east wetland complexes with an elevation of approximately 940. There are clusters of trees around the northeastern wetland complex which shall be preserved. The applicant is proposing a 26,962 square foot building expansion and associated parking. In order to expand the facilities, Outlot A and Lot 1 will be combined into one lot. No Surface Water Management fees were extracted from Outlot A as no development was proposed at the time. Instead, the fees were deferred until such a time as this parcel developed. Given the proposed improvements, the remaining fees will be extracted at this time. The non-developable wetland area and associated buffer will not be included in the calculations. Staff has requested this area be calculated and supplied to the city. Total disturbance will exceed one acre. As such, a National Pollution Discharge Elimination Permit will be required and a Surface Water Pollution Prevention Plan must be developed and submitted to the city for review and approval. There is a wetland present on the property to the north but no impacts are associated with this project. Stormwater management will occur through a combination of an infiltration basin and use of the existing stormwater detention pond. ARCHITECTURAL COMPLIANCE The applicant is requesting site plan approval for a two-story office-warehouse building expansion. The first phase of development included a 45,200 square-foot first story with 13,627 square-foot second story for a total building area of 58,827 square feet. This phase of the development includes a 26,962 square-foot first story expansion of the building consisting of 8,555 square feet of office and 18,407 square feet of warehouse space on the first floor and 8,555 square feet of office on the second floor for a total expansion of 35,517 square feet. The expansion will continue the architectural style and materials of the existing building. Size Portion Placement The main entrance to the building is located on the west side of the building in the center of the first phase of the development. The entrance is covered by metal canopy. The entrance is Planning Commission IDI Expansion – Planning Case 2016-18 July 19, 2016 Page 4 of 16 further emphasized by cultured stone veneer, flanking columns, and a raised, arched parapet with a decretive, keystone voussoir at the center of the arch. The entrance is projected out five feet from the main area of the building, stepping back four feet in the area of the two-story window projections, which then steps back one foot to the main building. Since the offices are located on the second story of the building, the window treatments along the entire front of the building are also pushed up to the second level. An entrance for the expansion is located on the north side of the building and will mirror the main entrance with a smaller canopy. Material, Detail and Color The building material is Fabcon exposed aggregate panels. The recessed office walls consist of red rock panels with cultured stone veneer (Western ledge Stak Mustang with stone cap). The window towers consist of buff-colored, smooth-finished, exposed aggregate concrete panels. Window sills consist of Mojave-colored (tan) burnished block. The majority of the building, around the warehouse, consists of buff-colored uniform low ribbed, exposed aggregate, concrete panels with a smooth band around the building. The windows consist of Hartford green aluminum frames with clear glass. Green sprandral glass panels are located in the upper two panes of the end unit office windows. A Hartford green prefinished metal coping caps the raised parapet walls with medium bronze prefinished metal coping on the balance of the parapets. Architectural lighting is proposed in the window towers above each window and above the entrance canopy. Height and Roof Design Height is limited to four stories or 50 feet in the Industrial Office Park District. The building has a stepped parapet height with the recessed wall areas at a height of 31 feet, the stepped window areas at a height of 35 feet and the main entrance with a curved parapet at a height of 38 feet. Mechanical equipment on the roof shall be screened through the use of low-profile units and placement away from the edges of the roof. No wooden fences are permitted on the roof for equipment screening. Facade Transparency Over 50 percent of the office elevation that is viewed from Audubon Road includes windows and/or doors. All other areas shall include landscaping material and architectural detailing and articulation. Site Furnishing The developer is proposing a canopy over the entrance to the building. They incorporate an outdoor patio break area with picnic tables or benches for employee use on the north side of the building. The developer provided a sidewalk connection from the building to the trail on Audubon Road. Planning Commission IDI Expansion – Planning Case 2016-18 July 19, 2016 Page 5 of 16 Loading areas, refuse area, etc. Loading areas are located on the southeast corner of the building, which is screened from public view by the building. No specific refuse area is proposed. A note on the plan states that dumpsters will be set inside the building and wheeled through the drive-in overhead door. An area north of the retaining wall in the truck docking area could be utilized as dumpster location. Landscaping Minimum requirements for landscaping include 2,784 sq. ft. of landscaped area around the parking lot, 11 trees and 5 landscape islands or peninsulas for the parking lot. The applicant’s proposed landscaping as compared to ordinance requirements for landscape area and parking lot trees is shown in the following table. The applicant meets minimum requirements for landscaping. FINAL PLAT This proposal under review includes the construction of a building that would lie over the property line between Lot 1, Block 1 and Outlot A. A building cannot be constructed over an outlot, therefore, Outlot A must be platted as a lot and combined with Lot 1, Block 1 prior to recording the site plan agreement. EASEMENTS The applicant’s surveyor shall show all easements of record on the existing based on a recent (within 90 days) title search of the parcel prior to recording the site plan agreement. Drainage and utility easements are in place site over the private water main, sanitary sewer and storm sewer utilities. Prior to recording the site plan agreement, the applicant must vacate the drainage and utility easement over the storm sewer they are removing. The proposal shows the building expansion within that drainage and utility easement. Required Proposed Vehicular use landscape area 2,784 sq. ft. >2,784 sq. ft. Trees/ parking lot 11 overstory 5 islands or peninsulas 13 overstory 6 islands/peninsulas Planning Commission IDI Expansion – Planning Case 2016-18 July 19, 2016 Page 6 of 16 GRADING AND DRAINAGE The existing site consists of a building and surface parking lot on the southern part of the parcel. The existing impervious areas convey stormwater to a pond offsite. The northern and eastern part of the property convey water to a wetland located on the northeastern corner of the site. An existing, approximately 10-foot tall stockpile of earth is on the northern half of the site. The plan proposes this will be removed for the construction of the parking lot and infiltration basin. The proposed haul route will take the excess material down Audubon Road to Lyman Boulevard to TH 101. The material will be delivered to Herman’s Landscape Supplies in Jordan Minnesota. The proposal of increasing the size of the parking lot and building increase the area of impervious pavement and stormwater runoff. The applicant has proposed an infiltration basin in the northwest corner of the parcel. This basin would receive water from part of the new parking and part of the existing parking on the east side of the building. The roof drain and part of the new parking lot would be directed to the existing offsite pond. The applicant has opted to show that this site has space for the required number of parking spaces, but not install them at this time (proof of parking). However, the proof of parking is located on the infiltration basin. Prior to recording the site plan agreement, the applicant shall submit a concept-level design for stormwater if the additional parking spaces were to be added at a future date. Prior to a notice to proceed, the grading plan shall be revised to show the existing and proposed elevation shots where the new curb line will tie-in to the existing curb. The Emergency OverFlow (EOF) locations and elevations shall be added to the grading and utility plan sheets. The applicant must submit a soils report to the City prior to recording the site plan agreement. Silt fence with steel posts shall be installed around the perimeter of the infiltration basin area prior to the start of grading. The applicant and its contractor shall protect the area from compaction and disturbance during construction. The basin shall be excavated after the site work is substantially complete and the slopes have been stabilized. After construction, the infiltration basin shall be tested by a third party for permeability to ensure that it is functioning per the stormwater modeling submitted by the applicant. The infiltration basin must pass the permeability testing prior to an issuance of a permanent certificate of occupancy. Planning Commission IDI Expansion – Planning Case 2016-18 July 19, 2016 Page 7 of 16 The applicant must submit a SWPPP and erosion control plan per City Code §19-145 for staff review prior to recording the site plan agreement. Prior to recording the site plan agreement, escrow shall be provided to the City for construction of erosion and sediment control measures and the infiltration basin. The applicant shall obtain permits from all appropriate regulatory agencies and comply with their conditions of approval. SITE GRADING: DRAINAGE Under existing conditions, all of lot 1 and a portion of Outlot A are directed to the pond located south and east of the site. The remainder of Outlot A drained to the northerly wetland. Under the proposed conditions, the building will still be directed to the existing pond, however, to meet abstraction requirements, the existing and proposed parking lot areas will be directed to a proposed infiltration basin before discharging into the northerly wetland. City code states that runoff rates must not be increased under the 2-year, 10-year or 100-year return frequency storm events. This is applied to all points leaving the site. The table below summarizes the rates from the existing pond and the northern drainage area pre and post expansion. Table 1. Runoff rate comparison pre and post expansion Return Frequency TO NORTHERLY WETLAND FROM EXISTING POND Existing Proposed Existing Proposed 2-YR 2.56 cfs 0.40 cfs 2.36 cfs 2.38 cfs 10-YR 5.37 cfs 2.01 cfs 5.89 cfs 4.87 cfs 100-YR 12.36 cfs 4.56 cfs 18.72 cfs 17.97 cfs Although there is a slight increase in rates under the 2 year return frequency event for the existing pond, the increase is negligible (0.02 cubic feet per second or approximately 1 pint per second) and is not likely to result in downstream issues. Code does allow some discretion in situations such as this. SITE GRADING: EROSION PREVENTION AND SEDIMENT CONTROL The proposed development will exceed one (1) acre of disturbance and will, therefore, be subject to the General Permit Authorization to Discharge Stormwater Associated with Construction Activity Under the National Pollution Discharge Elimination/State Disposal System (NPDES Construction Permit). The applicant shall prepare a Surface Water Pollution Prevention Plan (SWPPP) and submit to the city for approval prior to issuance of a building permit. No earth disturbing activities may occur until an approved SWPPP is developed. This SWPPP shall be a standalone document consistent with the NPDES Construction Permit and shall contain all Planning Commission IDI Expansion – Planning Case 2016-18 July 19, 2016 Page 8 of 16 required elements as listed in Parts III and IV of the permit. The city has a checklist which they will make available to the consulting engineer. The SWPPP should pay particular attention to the following items: 1. Protecting the proposed infiltration area from construction activity until the contributing watershed is stabilized. 2. Keeping rates into the infiltration basin below scour velocities. 3. The impaired status of Bluff Creek and following the guidelines and recommendations set forth in the Total Maximum Daily Load Implementation Plan. SITE CONSTRAINTS Wetland Protection The entire site was reviewed in 2008 and three basins were delineated. Wetland 1 was determined to be non- jurisdictional. Wetland 3 was placed into a drainage and utility easement within Lot 1. Wetland 2 is located in the northern. Because the wetland delineation is more than three years old, the applicant reflagged the boundary and staff reviewed the flag placement to assure that the proposed improvements would result in no net loss of wetland functions or values. Staff reviewed the wetland flags on July 7, 2016 and found them to accurately reflect the wetland limits. Based upon the field review and proposed improvements, there is highly improbable that any wetland impacts, either direct or indirect, will result from the proposed. The wetland is a Manage 2 wetland per our Wetland Protection Plan. This means that under City Code it requires a twenty (20) foot buffer and a thirty (30) primary structure setback from the buffer. Secondary structures can encroach up to 50% of that primary structure setback. Even allowing for the secondary structure setback, two stalls will need to be removed from the proposed parking lot. A drainage and utility easement will need to be placed over the wetland and associated buffer with final plat. Monuments indicating the buffer boundary will need to be shown on the plan and placed concurrent with the erosion prevention and sediment control practices. Figure 1 Area of encroachment into setback. Planning Commission IDI Expansion – Planning Case 2016-18 July 19, 2016 Page 9 of 16 Bluff Protection There are no bluffs on the property. Shoreland Management The property is not located within a shoreland overlay district. Floodplain Overlay This property does not lie with a floodplain. STORM WATER MANAGEMENT Article VII, Chapter 19 of City Code describes the required storm water management development standards. Section 19-141 states that “these development standards shall be reflected in plans prepared by developers and/or project proposers in the design and layout of site plans, subdivisions and water management features.” These standards include abstraction of runoff and water quality treatment resulting in the removal of 90% total suspended solids (TSS) and 60% total phosphorous (TP). The applicant is proposing the construction an infiltration feature to treat runoff from an area equivalent to the newly created impervious surface. According to the summary, they have achieved one inch (1”) of volume reduction from the new impervious surface. However, these are based off an assumed infiltration rate and they have not yet performed any soils exploration to determine the actual infiltration rate. In a conversation with the consulting engineer, they stated they would be providing that data. The applicant must achieve the 90% TSS and 60% TP removal using removal efficiencies recognized as industry standards or otherwise justifiable. The submittal did not include any water quality modeling. This will need to be provided and approved by city staff prior to issuance of a building permit. The plan submittal must also include a detail of the infiltration basin consistent with the Minnesota Stormwater Manual. This detail must include any soils corrections, basin protections and planting plans and schedules in addition to other necessary design elements. The infiltration basin must be placed within a drainage and utility easement. The applicant shall prepare an operations and maintenance manual specific to the infiltration feature including anticipated inspection schedule, routine maintenance and frequency of said maintenance. Planning Commission IDI Expansion – Planning Case 2016-18 July 19, 2016 Page 10 of 16 The plan indicates two outfalls into the infiltration basin. These shall be combined into one outfall. A sump manhole with a minimum depth of 4 feet shall be constructed at the last CBMH prior to discharging towards the infiltration basin. The pipe shall come out of the last structure into the infiltration basin no stepper than 1.0 percent. The outfall shall be short of the basin and shall flow through a grass channel to allow for energy dissipation and additional pretreatment. Storm Water Utility Connection Charges Section 4-30 of code sets out the fees associated with surface water management. The fees for Outlot A were deferred with the original subdivision. They will be collected with the site improvements. These fees are based on land use type and are intended to reflect the fact that more intense the development type, the greater the degradation of surface water. These fees can be credited up to 50% if the design has a reasonable expectation of achieving abstraction of the first 1.1 inches of runoff from all proposed hardcover on the site. The wetland and buffer and upland area put into the outlot will be removed from the assessed property. This area is 0.59 acres so the net assessable land area is 2.06 acres. They are indicating that 1.0 inches of runoff will be infiltrated. Barring any major changes in design assumptions, this warrants a 45% credit. Based upon the area and land use type, the Storm Water Utility Connection Charge is estimated to be $20,742/acre x 2.06 acres x 0.55 = $23,500.69 RETAINING WALL One retaining wall is proposed north of the new parking area. It is approximately 5.7 feet tall and 1800 feet long. The proposed construction material is modular block. If the finished height of the wall is over 6 feet high, the applicant is suggested to construct a fence or other barrier between the parking lot and the top of wall. PARKING LOT The parking lot plan shall be revised to meet the Chanhassen City Code requirements for driving aisles for 90 parking spaces or to use angled parking prior to a notice to proceed. The engineer shall show the truck turning movements in the loading area on the plan. The plan must follow all applicable State and Federal guidelines and accessibility for the parking lot and sidewalk construction. Planning Commission IDI Expansion – Planning Case 2016-18 July 19, 2016 Page 11 of 16 SANITARY SEWER & WATER MAIN The applicant proposes installation of 8” PVC water main. The City recommends use of C900 PVC material for watermain pipe due to soil conditions. The water main installed for this project shall be privately owned and maintained. Water main shall be installed per the most current version of the City of Chanhassen Standard Specifications and Detail Plates. Permits from the appropriate regulatory agencies will be required, including the MPCA and the Dept. of Health. Prior to a notice to proceed, the applicant’s engineer shall verify whether there is a conflict at the storm sewer/water main crossing for the relocated hydrant on the east side of the building, and alter the plans if necessary to remediate the conflict. The building expansion will have water and sanitary service provided by the existing building. City and Metropolitan Council SAC and WAC charges will be collected with the expansion’s building permit at the units determined by the Metropolitan Council and the rate effective at the date of permit. MISCELLANEOUS The building is required to have automatic fire extinguishing system. Building plans must be prepared and signed by design professionals licensed in the State of Minnesota. Soil evaluation (geo-technical) report required. Retaining walls over four high must be designed by a professional engineer and a permit must be obtained prior to construction. Detailed occupancy related requirements will be addressed when complete building plans are submitted. The owner and or their representative shall meet with the Inspections Division as soon as possible to discuss plan review and permit procedures. Planning Commission IDI Expansion – Planning Case 2016-18 July 19, 2016 Page 12 of 16 COMPLIANCE TABLE IOP IDI Building Building Height 4 stories 2 story 50 feet 38 feet Building Setback N - 10' E - 10' N – 323' E - 66' W - 30' S - 10' W - 115' S – 16’ Wetland Setback: 20’ buffer 20’ buffer Building 30’ to buffer 50’ to buffer Parking 15’ to buffer 15’ to buffer Parking Stalls 164 134 plus 32 as proof of park (Office 5/1,000 with 26,125 sq. ft. of office equals 131 stalls. Warehouse 1/1,000 for first 10,000, then 1/ 2,000 thereafter with 57,023 sq. ft. of warehouse equals 33 stalls.) Parking Setback N - 0' E - 10' N - 23' E - 14' W - 30' S - 0' W - 30' S - 10' Hard Surface Coverage 70% 57% Lot Area 1 acre 6.27 acres RECOMMENDATION Staff recommends that the Planning Commission approve the proposed building expansion for the expansion of IDI Distribution Building, plans prepared by Houwman Architects, dated June 6, 2016, and Sambatek, dated July 1, 2016, subject to the following conditions: Building Official 1. The building is required to have automatic fire extinguishing system. 2. Building plans must be prepared and signed by design professionals licensed in the State of Minnesota. 3. Soil evaluation (geo-technical) report required. Planning Commission IDI Expansion – Planning Case 2016-18 July 19, 2016 Page 13 of 16 4. Retaining walls over four high must be designed by a professional engineer and a permit must be obtained prior to construction. 5. Detailed occupancy related requirements will be addressed when complete building plans are submitted. 6. The owner and or their representative shall meet with the Inspections Division as soon as possible to discuss plan review and permit procedures. Engineering 1. Outlot A must be platted as a lot and combined with Lot 1, Block 1 prior to recording the site plan agreement. 2. The applicant’s surveyor shall show all easements of record on the existing based on a recent (within 90 days) title search of the parcel prior to recording the site plan agreement. 3. Prior to recording the site plan agreement, the applicant must vacate the drainage and utility easement over the storm sewer they are removing. 4. Prior to recording the site plan agreement, the applicant shall submit a concept-level design for stormwater that would meet the watershed district requirements if the additional parking spaces were to be added at a future date. 5. Prior to a notice to proceed, the grading plan shall be revised to show the existing and proposed elevation shots where the new curb line will tie-in to the existing curb. 6. The Emergency OverFlow (EOF) locations and elevations shall be added to the grading and utility plan sheets. 7. The applicant must submit a soils report to the city prior to recording the site plan agreement. 8. During construction, the infiltration basin area shall be protected from compaction and disturbance during construction. 9. The infiltration basin area shall not be excavated prior to substantial completion of the site work and stabilization of the slopes. 10. After construction, the infiltration basin shall be tested by a third party for permeability to ensure that it is functioning per the stormwater modeling submitted by the applicant. The infiltration basin must pass the permeability testing prior to an issuance of a permanent certificate of occupancy. 11. The applicant must submit a SWPPP and erosion control plan per City Code §19-145 for staff review prior to recording the site plan agreement. Planning Commission IDI Expansion – Planning Case 2016-18 July 19, 2016 Page 14 of 16 12. Prior to recording the site plan agreement, escrow shall be provided to the city for construction of erosion and sediment control measures and the infiltration basin. 13. The applicant shall obtain permits from all appropriate regulatory agencies and comply with their conditions of approval. 14. The parking lot plan shall be revised to meet the Chanhassen City Code requirements for driving aisles for 90 parking spaces or to use angled parking prior to a notice to proceed. 15. The plan must follow all applicable State and Federal guidelines and accessibility for the parking lot and sidewalk construction. 16. Water main to be installed for this project shall be privately owned and maintained during and after construction. 17. Private water main shall be installed per the most current version of the City of Chanhassen Standard Specifications and Detail Plates, which shall be included in the construction specification documents for this project prior to a notice to proceed. 18. Permits from the appropriate regulatory agencies will be required, including the MPCA and the Dept. of Health prior to a notice to proceed. 19. Prior to a notice to proceed, the applicant’s engineer shall verify whether there is a conflict at the storm sewer/water main crossing for the relocated hydrant on the east side of the building, and alter the plans if necessary to remediate the conflict. 20. City and Metropolitan Council SAC and WAC charges will be collected with the building permit at the units determined by the Metropolitan Council and the rate effective at the date of permit. Natural Resources 1. All existing trees to the north and west of the parking lot expansion shall be protected by tree preservation fencing. Fencing shall be installed and approved by the city prior to any grading. Planning 1. The applicant shall enter into a site plan agreement and provide the necessary securities required by it. 2. Dumpsters, if placed outside, shall be properly screened. Water Resources 1. The applicant shall apply for and receive a General Permit Authorization to Discharge Stormwater Associated with Construction Activity Under the National Pollution Discharge Planning Commission IDI Expansion – Planning Case 2016-18 July 19, 2016 Page 15 of 16 Elimination/State Disposal System (NPDES Construction Permit) prior to the issuance of a building permit or any earth disturbing activities. 2. The applicant must demonstrate that they can achieve the 90% TSS and 60% TP removal using removal efficiencies recognized as industry standards or otherwise justifiable prior to issuance of a building permit. 3. The applicant must provide the water quality modeling, in both a summary and the actual electronic model used to the city for review and approval prior to issuance of the building permit. 4. The plan submittal must also include a detail of the infiltration basin consistent with the Minnesota Stormwater Manual prior to issuance of a building permit. This detail must include any soils corrections, basin protections and planting plans and schedules in addition to other necessary design elements. 5. The infiltration basin must be placed within a drainage and utility easement. 6. The applicant shall prepare an operations and maintenance manual specific to the infiltration feature including anticipated inspection schedule, routine maintenance and frequency of said maintenance and supply a copy to the city prior to issuance of a building permit. 7. The two outfalls into the infiltration basin shall be combined into one and a sump manhole with a minimum depth of 4 feet shall be constructed at the last CBMH prior to discharging towards the infiltration basin. 8. The pipe shall come out of the last structure into the infiltration basin no stepper than one percent (1.0%). The outfall shall be short of the basin and shall flow through a grass channel to allow for energy dissipation and additional pretreatment. 9. The applicant shall prepare a Surface Water Pollution Prevention Plan (SWPPP) and submit to the city for approval prior to issuance of a building permit. No earth disturbing activities may occur until an approved SWPPP is developed. This SWPPP shall be a standalone document consistent with the NPDES Construction Permit and shall contain all required elements as listed in Parts III and IV of the permit. 10. The plan must eliminate the two stalls that encroach into the secondary setback from the wetland buffer. 11. Monuments indicating the buffer boundary will need to be shown on the plan and placed concurrent with the erosion prevention and sediment control practices. 12. The applicant shall apply for and obtain permits from the appropriate regulatory agencies (e.g., Minnesota Pollution Control Agency, Minnesota Department of Natural Resources (for dewatering), Riley-Purgatory-Bluff Creek Watershed District) and comply with their conditions of approval. Planning Commission IDI Expansion – Planning Case 2016-18 July 19, 2016 Page 16 of 16 ATTACHMENTS 1. Findings of Fact and Recommendation. 2. Development Review Application. 3. Reduced Copy Audubon Corporate Center 2nd Addition 4. Reduced Copy (Architectural) Project Info Site Plan Prepared by Houwman Architects Sheets A1.0 – A3.1 5. Reduced Copy Photometrics prepared by Electrical Production Services 6. Reduced Copy (Civil) IDI Distribution Building Expansion prepared by Sambatek Sheets C1.01 – L2.01 7. Memorandum from Scott Sobiech, BARR, to Bob Generous dated 7/6/16 8. Public Hearing Notice and Mailing List