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1f. Final Plat for Minnewashta Highlands
1 . be t CITY OF 1 1 4 . CUANBASSEN ..... , , _ . . _ I 690 COULTER DRIVE • P.O. BOX 147 • CHANHASSEN, MINNESOTA 55317 (612) 937-1900 ;art!.-; .. ` � 1 ' . .ice C44 IIMEMORANDUM . " 1. -2.34 / TO: Don Ashworth, City Manager IFROM: Stephen Hanson, Planning Director .b . 1 DATE: February 22, 1989 --- 2 °'x7 81 SUBJ: Final Plat Approval, Minnewashta Highlands (Formerly 1 known as Schwaba-Winchell) This application was presented to the City Council at the January 0 , 1989 , meeting. The Council tabled the item at that time for 1 staff to get further information from teh applicant and rewrite the conditions . The applicant has submitted the grading, drainage and landscape plan for the property. The landscape plan 1 calls for the planting of 6 foot Austrian Pines along the rea4r property line in clusters . A total of 21 pines will be planted. 1 The grading, drainage, street grade, sanitary sewer, and water- main plans and specifications have been submitted to Engineering for review and approval . The conditions of preliminary plat approval will be covered in the development contract. 1 RECOMMENDATION 1 Staff recommends the City Council approve the final plat for Minnewashta Highlands subject to the following conditions: 1 . Execution of a development contract to include the following 1 specific conditions : a. Provide necessary financial sureties . 1 b. Applicant apply and obtain oermts from watershed district, DNR and other appropriate agencies prior to construction. Ic . Construction on Lake Minnewashta Parkway shall be prohi- bited. 1 d. A grading, drainage, and erosion control plan for each lot will be required as part of the building permit 1 application process. II I t I Minnewashta Highlands February 22, 1989 Page 2 e. All private access shall be served by the internal cul-de-sac. f . The accessory building on Lot 3 shall be removed. g. Landscaping along the rear of Lots 1-3 shall be installed immediately after the over lot grading is completed. h. Approval based on plans stamped "Received February 3, 1989" . ATTACHMENTS 1 . Letter from William R. Engelhardt Associates, Inc. dated March 7 , 1989. 2 . City Council minutes dated January 9 , 1989 . 3 . Staff report dated January 4 , 1989. 4 . Final plat map. 5 . Grading, drainage and landscape plans. I I I I I WILLIAM R. ENGELHARDT ASSOCIATES, INC. Km4aiing fnyinee/M 1107 HAZELTINE BOULEVARD ' CHASKA, MINNESOTA 55318 (612) 448-8838 March 7 , 1989 ,,�ar CITY CF IRMI S N ' City of Chanhassen 07 1989 c/o Mr . Steve Hanson Plll',,, © ! ' 690 Coulter Drive Chanhassen , MN. 55317 ENEINEERING DEPT, ' RE: Minnewashta Highlands Subdivision ' Honorable Mayor and City Council Members : Minnewashta Highlands is a five ( 5) lot subdivision located ' on Minnewashta Parkway , South of Maple Ridge Drive and North of Hathorne Circle. Presently there is one existing dwelling on the property which will be incorporated into the plat as a lot . ' The proposed plan for the subdivision includes a short cul - de-sac , approximately 70 feet in length , to provide access to the five ( 5) lots . Municipal sewer and water will be provided for all lots . The major focus and issues involved with this plat are the ' grading , drainage , and landscaping . Several residents adjacent to the plat have expressed concerns regarding the drainage from this plat and problems they observed during the construction of the Maple Ridge subdivision . Consequently, we have worked with the city staff to address drainage issues in the area. We have reviewed the Maple Ridge plat and calculated the pond sizing and verified that the outlet baffles to control sedimentation are in place . The drainage calculation have been completed for the ' proposed plat now under consideration . We find that the pre- development drainage patterns of the proposed plat consisted of approximately 0 . 35 acres to the Southwest , 0 . 62 acres to the North and Minnewashta Parkway , and 1 . 25 acres to the East onto ' adjacent properties . The drainage patterns after development consist of 0 . 39 acres to the Southwest , 0 . 77 acres to the road and North , and 1 . 06 acres to the East onto the adjacent property . All road hard surface area has been directed to Minnewashta Parkway . As aforementioned , the net affect on the Easterly properties is a reduction in drainage area with one-half of two roof tops directed East . In regard to hard surface area, these two roof tops have a minor impact in the drainage calculations . 11 ■ t City of Chanhassen March 7, 1989 Page 2 In our review of the Maple Ridge subdivision we found an excess in pond capacity of 0. 18 ac-feet . The required ponding for Minnewashta Heights is 0. 04 ac-feet . By directing as much as possible of the Minnewashta Heights drainage to the Maple Ridge ponds we will achieve two benefits . Ponding will be provided , and the drainage will be controlled onto the adjacent properties via ponding and the baffle skimmer . ' The major potential problems with this subdivision could occur during construction . To reduce this major problem area we are proposing a double row of erosion control barrier of hay bales and silt fences at the bottom of the slope areas proposed to be graded . A second issue involved with this plat was providing landscaping on the East property line . We have provided for berms and a total of 21 pine trees to be located along this line to provide for the requested landscaping . We trust that the major issues of this plat have been addressed properly . If additional concerns arise during your discussions of this plat we will try to accommodate them as much as possible. Very truly yours , WILLIAM R. ENGELHARDT ASSOCIATES, INC. William R. Engelhardt WRE/ las cc : Ms . Ellie Schawaba I 11 MINNEWASHTA HIGHLANDS DRAINAGE INFORMATION AND CALCULATIONS RUNOFF AREAS PRIOR TO DEVELOPMENT: ' Drainage to the Southwest = 0 . 35 acres Drainage to Minnewashta Parkway and North in existing ditch = 0 . 62 acres Drainage to the East and off the site = 1 . 25 acres RUNOFF AREAS AFTER DEVELOPMENT: ' Drainage to the Southwest = 0. 39 acres Drainage to Minnewashta Parkway and North in existing ditch = 0 . 77 acres ' Drainage to the East and off the site = 1 . 06 acres CONCLUSIONS : 0 . 04 acre increase in area draining to the Southwest after development . ' 0. 15 acre increase in area draining to Minnewashta Parkway and North in existing ditch after development . 0 . 19 acre decrease in area draining to the East and off the site after development . MAPLE RIDGE Determine pond size for storage of a 24-hour , 100-year storm: 4 . 8 acre drainage area before development of Maple Ridge. 0 . 62 acre drainage area before development of Minnewashta 1 Highlands . Total area =- 5 . 42 (See stormwater storage determination sheets ) Calculations determine a storage area of 0 . 23 Ac . Ft . is needed . Maple Ridge grading plan show a proposed pond ( to the 950 . 0 contour ) of 0 . 41 Ac . Ft . Excess storage capacity = 0 . 18 Ac . Ft . 1 ;1 II STORMWATER STORAGE DETERMINATION WILLIAM R. ENGELHARDT ASSOCIATES , INC . I Consulting Engineers 1107 Hazeltine Boulevard II Chaska, Minnesota 55318 (612)448-8838 Project Name: ) to ,„,,.. I�,-J 4tah I`nr1d 5 Date: 3 ei/g° I Location: (71.-,a , )1 d7ce r/ Project No. Storm Frequency /2^0 II Owner: r, / / e_ cf? t,,,.3 tan- . c e I -v CJe1 I1 /h t- poll, 5"7 -- I' /27D,"le- K E 79C - 0-/2 y)a!'E'rl The following are detailed steps for the determination of allowable ' release rate and the required flood storage capacity. I . Determination of Allowable Release Rate - Undeveloped Site : 1 1 . Area of site 5. `/`/ acres 2 . Average ground slope /2' 0 foot/foot 3. Overland flow distance ?Z O feet 4 . Overland flow time of concentration / minutes 5 . Average slope of channelized flow foot/fo� 6 . Channelized flow distance feet 7 . Channelized flow time of concentration minutes !' 8 . Total time of concentration (line 4 + line 7) / . minutes 9 . Rainfall intensity for ) 0 0 year storm, I (the time duration on line 8) 22 inches/hr 10. Runoff coefficient 0. - I 11 . Allowable release rate , ( line 1 x line 9x line 10)Q=CIA /175 cfs. (Use this release rate for calculations in Col.D of Note : For flow in a well defined channel determine time of concentration' from measured lengths , cross-sections and slopes and submit necessary calculations and drawings. II II. Determination of Reservoir Size - Developed Site: 12. Impervious drainage area acres II 13 . Pervious drainage area acres 14 . Composite runoff coefficient C, !., 15 . Determine flood reservoir capacity (see Page 2) I 16. Required reservoir capacity acre-feet II 1 II ■ I : DETERMINATION OF REQUIRED STORM WATER DETENTION ONE YEAR STORM A B C D E Intensity For Inflow Rate Stored Rate Reservoir Size Duration Time 1 yr. Storm (Line 1 x Line 14 (Col.0-Line 11) (Col.A(Hrs)xCol.D 1 (Hrs.) (Min. ) (In./Hr. ) x Col.B) (cfs) - (cfs) :12)(Acres-Ft. ) 0.17 10 3.4 0.33 20 2.5 ' 0.50 30 1.9 0.67 40 1.6 0.83 50 1.35 I1.0 60 1.2 1.5 90 0.9 2.0 120 0.72 II 3.0 180 0.54 -` 4.0 240 0.42 TEN YEAR STORM II A B C D ' E Intensity For Inflow Rate Stored Rate Reservoir Size Duration Time 10 yr. Storm (Line 1 x Line 14 (Col.0-Line 11) (Col.A(Hrs) x Col.D (Hrs. ) (Min. ) (In./Hr.) x Col. B) (cfs) (cfs) : 12) (Acre-Ft) II0.17 10 5.6 0.33 20 4.1 0.50 30 3.3 I 0.67 40 2.7 0.83 50 2.4 1.0 60 2.1 I 1.5 90 1.5 2.0 120 1.3 3.0 180 0.9 I4.0 240 0.72 ONE HUNDRED YEAR STORM IA B C Inflo D E Intensity For Inflow Rate Stored Rate Reservoir Size Duration Time 100-yr. Storm (Line 1 x Line 14 (Col.0-Line 11) (Col.A(Hrs) x Col.D I (Hrs. ) (Min. ) (In./Hr. ) x Col.B)(cfs) (cfs) : 12)(Acre-Ft) 0.17 10 8.4 77,`7 15.(,-5 0 Z 2 0.33 20 6.2 2/,, R q' flp ✓ I 0.50 30 4.8 __ 0.67 40 4.0 13./ ( 3 5 0.83 50 3.5 //,y II 1.0 60 3.1 10, 1 • 1.5 90 2.3 7 5 2.0 120 1.85 3.0 180 1.35 II4.0 240 1.1 II II II II STORMWATER STORAGE DETERMINATION WILLIAM R. ENGELHARDT ASSOCIATES, INC. I Consulting Engineers 1107 Hazeltine Boulevard Chaska, Minnesota 55318 II (612)448-8838 Project Name: kit lr,n r,..0/ 4, t-,..- 414, Lolel 5 Date: 3h,,//i3 L II ocation: CAtsrfj4I1 e/! Project No. // Storm Frequency /(3) Owner: /717////e.- S /g, G!A-1 h e.:-- II The following are detailed steps for the determination of allowable I release rate and the required flood storage capacity. I . Determination of Allowable Release Rate - Undeveloped Site : I 1 . Area of site n. G. 2 acres 2 . Average ground slope /. 5 foot/fot 3 . Overland flow distance Z,, so feet 4 . Overland flow time of concentration Z :77- minutes 5 . Average slope of channelized flow foot/folk 6 . Channelized flow distance feet 7 . Channelized flow time of concentration _ minutes' 8. Total time of concentration (line 4 + line 7) 2S minutes 9 . Rainfall intensity for low) year storm, (the time duration on line 8) 5 . S inches! r 10. Runoff coefficient J 2 1 II 1 . Allowable release rate, ( line 1 x line 9 x line 10)Q=CIA J OZ cfs. (Use this release rate for calculations in Col.D of Note : For flow in a well defined channel determine time of concentratio' from measured lengths , cross-sections and slopes and submit necessary calculations and drawings . II . Determination of Reservoir Size - Developed Site : I 12 . Impervious drainage area acres 13. Pervious drainage area acres II 14 . Composite runoff coefficient (?. C., 15 . Determine flood reservoir capacity (see Page 2) II 16. Required reservoir capacity acre-fee 1 II 1 I I e IDETERMINATION OF REQUIRED STORM WATER DETENTION ONE YEAR STORM II A B C D E Intensity For Inflow Rate Stored Rate Reservoir Size Duration Time 1 yr. Storm (Line 1 x Line 14 (Col.0-Line 11) (Col.A(Hrs)xCol.D 1 (Hrs.) (Min. ) (In./Hr.) x Col.B) (cfs) (cfs) :12)(Acres-Ft. ) 0.17 10 3.4 0.33 20 2.5 ' 0.50 30 1.9 0.67 40 1.6 0.83 50 1.35 I 1.0 60 1.2 1.5 90 0.9 2.0 120 0.72 3.0 180 0.54 II 4.0 240 0.42 _` _ TEN YEAR STORM A B C D E IIIntensity For Inflow Rate Stored Rate Reservoir Size Duration Time 10 yr. Storm (Line 1 x Line 14 (Col.0-Line 11) (Col.A(Hrs) x Col.D (Hrs.) (Min. ) (In./Hr.) x Col. B) (cfs) (cfs) : 12) (:scre-Ft) II0.17 10 5.6 0.33 20 4.1 0.50 30 3.3 II 0.67 40 2.7 _� - _ 0.83 50 2.4 1.0 60 2.1 I 1.5 90 1.5 _ 2.0 120 1.3 3.0 180 0.9 4.0 240 0.72 IIONE HUNDRED YEAR STORM II A B C D E Intensity For Inflow Rate Stored Rate Reservoir Size Duration Time 100 yr. Storm (Line 1 x Line 14 (Col.0-Line 11) (Col.A(Hrs) x Col.D (Hrs.) (Min. ) (In./Hr.) x Col.B)(cfs) (cfs) : 12)(Acre-Ft) II0.17 10 8.4 2,1 27 /0 (,, 03 0.33 20 6.2 X21 1. 29 p eS `� ' 0.50 30 4.8 /. 7? 77 3 z 0.67 40 4.0 /,y9 y7 0.83 50 3.5 /,; (.2, 7 8 1.0 60 3.1 /,/_ U /3 ' 1.5 90 2.3 2.0 120 1.85 3.0 180 1.35 II4.0 240 1.1 II I II ki r 11 City Council Meeting - Jar', :y 9, 1989 1 j. Issue Certificate of Compliance for Chanhassen Vista 1st, 2nd, 3rd and 4th Additions, Enterprise Properties, Inc. 1 k. Issue Certificate of Compliance for Lake Lucy Highlands, Merrill Stellar. 1. Approve Federal Aid Highway Agency Revised Agreement Regarding Utility ' Accommodation Policy. m. Resolution #89-04: Accept Plans and Specifications for West 78th Street I Stormwater Retention Pond, Kronick; Authorize Advertising for Bids. n. Approval of Accounts. i o. City Council Minutes dated December 12, 1988 City Council Minutes dated December 19, 1988 Public Safety Commission Minutes dated December 15, 1988 Park and Recreation Comui-ssion Minutes dated December 13, 1988 All voted in favor and the motion carried. , (D) FINAL PLAT APPROVAL, MINNEWASHTA HIGHLANDS. ' Councilman Boyt: Item (d) , I think speaks to a point that really might be somewhat relevant to the ability of staff to get things completed in time for a council meeting that we talked about earlier. It also relates to developers understanding that they need to meet these criteria prior to the council meeting. If you look on page 2, item 11, landscaping was a fairly important part of this particular plat. We spent quite a bit of time the evening it was initially passed discussing landscaping and we find that the developers have not completed their landscaping plan. We don't have that in front of us. I find that the landscaping plan that they have completed, doesn't meet the criteria that I had when I suggested that they come up with a landscaping plan. Not being able to go out and see the site as part of the council meeting, we left this open to staff to work out with the developer a reasonable means of screening this piece of property from the people between them and the lake basically. I find that 1 pine tree for every 40 feet does not accomplish that. I can understand and one of the reasons we wanted staff to look at this was that if berming was talked about, berming doesn't fit the site according to staff but 1 tree in 40 feet doesn't fit the plan, that I had in mind anyway. I would like to see instead of passing this along, which basically says it was alright to not come in with a landscaping plan, I'd like to see this tabled until we have a landscaping plan. Councilman Workman: If I could add to that. I was approached by the people who, the proposed property here, the property between it and the lake. Lake , Minnewashta. There's 3 property owners there who suggested that they're going to have a drainage problem across their property. Now I don't know, item 7, a 15 inch diameter culvert will be required underneath the northerly proposed II driveway. I'm not sure what the northerly proposed driveway i.s. These 3 properties apparently were affected by what is known as the Maple Ridge development just north of there. Apparently a pond was filled in and the City is working to clear that. These people would like some more time. I'd like to move that we table it to give this people more time to figure out where the 12 , ■ I , City Council Meeting -( .nuary 9, 1989 I drainage is going to go. Not only from Maple Ridge but also this new item. Do ' we know that yet? What is considered the northerly proposed driveway? Larry Brown: That condition inadvertently was included off of the original ' submittal. That condition is no longer valid for this plat. To address your concern, normally we would have them go through a plans and specifications review. What you're suggesting maybe is that they come up with another grading plan prior to this returning so that we can address those drainage issues. Councilman Boyt: Another question if I might Mr. Mayor. Larry, is there a drainage problem here? Is that what you're saying? The current grading plan ' shows that there will be a drainage problem? Larry Brown: The plans which they have submitted does not indicate any proposed grading other than what would be anticipated through the house pad construction. So with the exception of the building of the cul-de-sac, which we would anticipate would direct more of the drainage which is running radially outward from the center into the cul-de-sac and onto Lake Minnewashta Parkway and not ' back to those homes so in all actuality, we would anticipate that they're improving it. However, without the actual document in front of us, we really don't... ' Councilman Boyt: You haven't seen a grading plan yet? Larry Brown: No. 11 IL ' Councilman Boyt: Isn't that normally part of a final plat approval? ' Larry Brown: We would normally run than through a grading, drainage and erosion control plan to be approved by Council as part of plans and specifications review process. ' Gary Warren: I might add if I could Mr. Mayor. The Watershed District, the size of this subdivision is less than 2 acres. Just barely but it is so it's less than what the Watershed District considers as warranting an extensive ' drainage study. The proposal as it came through the process called for the minimal grading of the site. We weren't talking about mass grading which would normally generate a full drainage review also so the submittal as it came ' through the preliminary platting process, which did subsequently change to a cul-de-sac scenario, really was a minor modification to the subdivision area. The drainage issue as far as the City's pond that Councilman Workman referenced, was filled and we have been working with a builder up there who had been filling in this area to use that as a pond site. He is on notice and will be cleaning it up as soon as the weather allows in the spring. My personal review of the area up there, I don't think we have significant runoff and as Larry mentioned, I think will even be improving the subdivision runoff because of the cul-de-sac and the transfer really of some of the drainage to the Lake Minnewashta Parkway area. Larry is correct in that we should be looking at this on a lot by lot basis as the submittals come in and we'll take a close look when plans and specs are submitted as required for the roadway improvement. Councilwoman Dimler: Could I have a point of clarification Gary from you? It ' is my understanding that this is going to be 5 homes on this 2.19 acres which seems like a lot of development but I guess they do meet the 15,000 square foot 13 • Q./13 / (- City Council Meeting - Ja! ry 9, 1989 minimum lot size. However, condition 7 stated that there's a 15 inch diameter culvert to be underneath the northerly proposed driveway and I don't see that it explains where this will drain. Could you explain to me where this will drain? Gary Warren: Larry was mentioning, I think that condition is not correct. Is that right? Larry Brown: That's correct. That was for the original submittal and inadvertently got placed for the revised plat which shows a cul-de-sac. So if the Council sees fit, we could eliminate condition 7. Councilwoman Dimler: I would move then that we eliminate condition 7 from this final plat approval for Minnewashta Highlands. Gary Warren: 'lb answer your question a little further Councilwoman Dimler, the drainage along Minnewashta Parkway that that condition addressed originally was I believe for the drainage along the roadway isn't it Larry? Larry Brown: That's correct. I Gary Warren: Which is not being diverted. Mayor Chmiel: Councilman Boyt made the motion that this specific item should be , tabled. I believe you also made that same motion. Councilwoman Dimler: Excuse Mr. Mayor, should we vote on the motion to omit item number 7 before we table? Mayor Chmiel: Yes we can. We can do that now but I was going to have them include that in their motion. There's a motion made that item number 7 be removed from that recommendation. With that being struck. Is there a second? Councilman Workman: Second. I Councilman Johnson: - I think what probably should be done on this is that we're just going to table the thing anyway. At that point, direct staff to rewrite the conditions. Obviously we've found a clerical error and to address Tom's issue, I think that can be added into item 6. So I think the best motion would be to have a tabling motion to table the item until a good landscape plan is submitted as required for the final plat. At the same time, eliminate item 7 which is redundant and modify item 6 to add drainage review of the grading plans at the same time. I think that will cover everything versus having multiple motions. Councilwoman Dimler: Alright then. I will withdraw my motion. Councilman Johnson: I will make that motion now. I hadn't made the motion yet. I just discussed making one. I didn't actually make it. I so move that motion. Mayor Chmiel: Jay's motion is such as indicated with those changes contained , within item 6 and 7. Is there a second? Councilman Workman: I'll second that. 14 I • ■ City Council Meeting 1..,nuary 9, 1989 IICouncilman Johnson: There's also a change. IF Mayor Chmiel: With all proper changes as you indicated. ' Councilman Johnson moved, Councilman Workman seconded to table Final Plat Approval for Minnewashta Highlands so that staff can get additional information 11 motion rewrite the conditions as proposed by Council. All voted in favor and the motion carried. Mayor Chmiel: Basically what's done is this has been tabled for staff to review to make the acceptable changes to item 6 and 7. That 7 actually be eliminated as it was redundant. Councilman Johnson: And don't bring it back until we have the landscaping plan. Mayor Chmiel: Right. The landscaping plan is a necessary requirement for this. ' Councilman Boyt: I would suggest that it might be appropriate for the Council to at least think about directing staff to not present items that aren't fully complete. We're going to take some heat if we happen to take that position but I think it puts staff in a much better position to work with developers. The developer can't run around the staff to come to the Council. They have to have II 1 the complete application before they bring it in front of us. Councilman Johnson: And I think if we continuously back up staff on that, that developers will get the message eventually. (H) APPROVE SIGNAGE PACKAGE FOR PLEASANT VIEW ROAD. Councilman Boyt: Item (h) , as you'll notice, we've taken an opportunity to put .: up quite a few signs on Pleasant View. I think there's two things. One, I ' would like to see us notify the people who live on Pleasant View, possibly send them a map like this so that they'll realize there's some logic behind the sudden increase in signs. I think that this brings out what I really want to speak to in this is a bigger issue. You'll see in the fourth line of the staff report, it talks about site distance and speed control. I think that most of us realize that signs do not provide speed control and that we have a major speed control problem, as I see it, in Chanhassen. The signs may be nice but when you get so many of them out there, people don't even look at them so I have a concern that this is going to accomplish anything other than possibly clarifying a few areas where we have a sign in one direction and we don't have it in the other. But it certainly isn't going to provide speed control. I just wanted to make that comment. I would move that we pass Consent Agenda item 3(h) . Councilman Johnson: Second. IlfCouncilwoman Dimler: I just have a question. I guess I'd like to know what the grass roots movement was for this particular item? Did it come from the people who live on Pleasant View or because the City felt we needed it for safety or ' what? 15 I„_ C1TYOF ---- 1 CHANHASSEN 1 w� - 690 COULTER DRIVE • P.O. BOX 147 • CHANHASSEN, MINNESOTA 553.17 (612) 937-1900 MEMORANDUM TO: Don Ashworth, City Manager FROM: Steve Hanson, Planning Directo x DATE: January 4 , 1989 SUBJ: Final Plat Approval, Minnewashta Highlands (Formerly Known as Schwaba-Winchell) The preliminary plat for Minnewashta Highlands was approved by the City Council on April 11 , 1988 subject to the following con- ditions: 1 . The applicant shall enter into a development contract with the City and provide the City with the necessary financial sureties. 2 . The applicant shall apply for and obtain permits from the watershed district, DNR and other appropriate regulatory agencies and comply with their conditions of approval . 3 . Construction on Lake Minnewashta Parkway shall be prohibited. 1 4 . Lots that are required to share a singular sanitary sewer service will be required to provide a 6-inch cleanout on each branch of the service located between the house and the wye (refer to Attachment #2) . 5 . Lots required to share a singular water stub will be required ' to provide a curb at the wye and on each branch of the wye ( refer to Attachment #3 ) . 6 . An acceptable grading plan shall be provided by the developer for the corrective sight distance grading of Lots 4 and 5 prior to the issuance of building permits . I 7 . A 15-inch diameter culvert will be required underneath the northerly proposed driveway. 8 . A grading, drainage and erosion control plan for each lot will be required as part of the building permit application process . , I Mr. Don Ashworth January 9 , 1989 Page 2 9 . All private accesses shall be served by the internal cul-de- sac. No private accesses shall be allowed onto Minnewashta Parkway. ' 10 . The accessory building on Lot 3 shall be removed. 11 . Landscaping feasibility plans be worked out by staff and if possible be returned to the City Council with the final plat. The conditions of the preliminary plat approval should be con- tained in the development contract. The last item on landscaping ' feasibility to screen adjacent properties has not been submitted. The intent was to provide a screen between these homes and the existing homes . There was a concern whether pines would provide ' a screen due to the slope of the land. Staff feels plantings along the perimeter would provide a screen . Also mentioned at the Council meeting was the possibility of berms on the east side of the subdivision. The berm does not appear to be a workable alternative due to the slope of the land. It is recommended that pines be planted near the top of the slope for every 40 ft. of the rear perimeter of the subdivision. The pines should be clustered and be no smaller than 6 ft. in height. Plantings should occur after final grading and before completion of public improvements and before issuance of building permits . RECOMMENDATION Staff recommends City Council approve the final plat for Minnewashta Highlands subject to the following conditions being included in the development contract: 1 . The applicant shall enter into a development contract with the City and provide the City with the necessary financial sureties . ' 2 . The applicant shall apply for and obtain permits from the watershed district, DNR and other appropriate regulatory agencies and comply with their conditions of approval . 3 . Construction on Lake Minnewashta Parkway shall be prohibited. 4 . Lots that are required to share a singular sanitary sewer service will be required to provide a 6-inch cleanout on each branch of the service located between the house and the wye (refer to Attachment #2) . r5 . Lots required to share a singular water stub will be required to provide a curb at the wye and on each branch of the wye ( refer to Attachment #3) . Mr . Don Ashworth January 4 , 1989 Page 3 i 6 . An acceptable grading plan shall be provided by the developer for the corrective sight distance grading of Lots 4 and 5 prior to the issuance of building permits . 7 . A 15-inch diameter culvert will be required underneath the 11 northerly proposed driveway. 8 . A grading, drainage and erosion control plan for each lot will be required as part of the building permit application I process . 9 . All private accesses shall be served by the internal cul-de- sac. No private accesses shall be allowed onto Minnewashta Parkway. 10 . The accessory building on Lot 3 shall be removed. , 11. Landscaping plans provide for 6 ft. pines along the rear perimeter of the subdivision at 1 for every 40 ft. Spacing to be varied along the top of the slope. Landscaping to be done after grading is complete and before public improvements are complete and before issuance of building permits . 1 I 1 r I I ■ • « ' 6500 ..�'•'.,A �� 6600 I.I*: .+IPr/4,t,- Qtr. v' '' /AI •t's• *-ekraiffr' .:*•41.41 . . ,i 6700 '/• Ij 3743r O. wan- M. ma / %' 6800 ,�% L A K E i III"iii 1 6900 M I S I I M / N N E W i4 S /,I T I r,; 11WIIILL� RD 7000 _ UD R I • a> (')4 1 '' --- -- 5 7100---- Q LAKE' �� ,:,\441. Illitr 's - ,, i ' mpir= PON•• 4.4, •r .AN,„ 4 0 } � `� 1/�IN� � " I 7200 ." s >- tpr 104 /W\_∎ x I 7300 - ~ rac. . . ,. / MAPLE 3NORE3 � DRIVE F , v �-6DN 1 , 6 ., MINT 11111(1 iriD . .‘ I ilialiirjo 7500 :` ?• ___41b ii Err ;-# 1 UMW- MEW 7600---- ,* /*& .: --. \'' _ _ ,, 7700-.—___ /1 rv� 7800- , r----- \ Pp t• 7900 V' A2 8000- 3 1 (...IONO- I CITYOF II , lil: \ k , • CHANHASSEN 690 COULTER DRIVE • P.O. BOX 147 • CHANHASSEN, MINNESOTA 55317 (612) 937-1900 IIMEMORANDUM TO: Steve Hanson , Planning Director IIFROM: Gary Warren, City Engineer I DATE: March 8 , 1989 SUBJ: Minnewashta Highlands, Ellie Schwaba File No. 89-2 (pvt) I have reviewed the March 7 , 1989 submittal from William R. II Engelhardt and Associates which has been prepared to address the drainage concerns that were raised for this subdivision when last reviewed. As noted by Mr. Engelhardt, the actual drainage pat- 11 tern as it relates to runoff to the east has been reduced somewhat from 1 . 25 acres to 1 . 06 acres. An important element of this drainage concept is that the drainage that is routed to the west be assured of a positive passageway to the catch basins on 1 Maple Shores Drive and that it is not allowed to short circuit down the gravel roadway which borders the northerly portion of this subdivision. IIMr. Engelhardt has also reviewed the Maple Ridge pond as it rela- tes to accommodating this additional drainage from Minnewashta I Highlands . As noted in his correspondence, there is sufficient capacity to easily accommodate the Minnewashta Highlands drainage. These calculations have been made based on a 100-year storm event which is consistent with the City and Watershed IIDistrict requirements . As noted in the attached correspondence, the Maple Ridge pond has I been filled in to some extent. This material needs to be removed in order to achieve the storage capacity as originally planned and to accommodate this runoff . This would best be accomplished at the time that site grading is done for Minnewashta Highlands . As shown on the attached plat, the City has easement rights to Lots 11 and 12 , Maple Ridge, for these drainage facilities . Further, when weather conditions permit access this spring, the 11 City ' s public works personnel will inspect the 12-inch diameter discharge pipes from this drainage area to Lake Minnewashta and will take necessary actions to clean any debris from this pipe to IIaccommodate runoff from this pond discharge area. I I Steve Hanson March 8 , 1989 Page 2 It is therefore my recommendation that the final plat for Minnewashta Highlands be approved with the following engineering conditions: 11 1 . That a positive drainageway shall be constructed across the gravel driveway to the north of the subdivision to assure that drainage from the subdivision cannot short circuit down the gravel driveway. 2 . That the developer shall assist the City with grading of the Maple Ridge retention pond to restore its original contours at the time that site grading is undertaken on the subdivision. Attachment ' 1 . Letter from Bill Engelhardt dated March 7 , 1989 . 2 . Letter to James Jasin dated December 19 , 1988 . 3 . Plat/Drainage Map. 11 cc : Bill Engelhardt Ellie Schwaba Jim Borchart, 7331 Minnewashta Parkway. I 11 1 I WILLIAM R. ENGELHARDT ASSOCIATES, INC. V'O'n4ed enyvnee44 1107 HAZELTINE BOULEVARD CHASKA, MINNESOTA 55318 (612) 448-8838 11 March 7 , 1989 City of Chanhassen c/o Mr . Steve Hanson 690 Coulter Drive Chanhassen , MN. 55317 RE: Minnewashta Highlands Subdivision ' Honorable Mayor and City Council Members : Minnewashta Highlands is a five ( 5) lot subdivision located on Minnewashta Parkway , South of Maple S4oZ S Drive and North of Hathorne Circle . Presently there is one existing dwelling on the property which will be incorporated into the plat as a lot . The proposed plan for the subdivision includes a short cul - de-sac, approximately 70 feet in length , to provide access to the five ( 5 ) lots . Municipal sewer and water will be provided for all lots . The major focus and issues involved with this plat are the grading , drainage, and landscaping . Several residents adjacent to the plat have expressed concerns regarding the drainage from this plat and problems they observed during the construction of ' the Maple Ridge subdivision . Consequently, we have worked with the city staff to address drainage issues in the area.. We have reviewed the Maple Ridge plat and calculated the pond sizing and verified that the outlet baffles to control sedimentation are in place . The drainage calculation have been completed for the ' proposed plat now under consideration . We find that the pre- development drainage patterns of the proposed plat consisted of approximately 0 . 35 acres to the Southwest , 0 . 62 acres to the North and Minnewashta Parkway , and 1 . 25 acres to the East onto adjacent properties . The drainage patterns after development consist of 0 . 39 acres to the Southwest , 0 . 77 acres to the road and North , and 1 . 06 acres to the East onto the adjacent property . All road hard surface area has been directed to Minnewashta Parkway . As aforementioned , the net affect on the Easterly properties is a reduction in drainage area with one-half of two roof tops directed East . In regard to hard surface area, these two roof tops have a minor impact in the drainage calculations . I I 1 City of Chanhassen March 7 , 1989 Page 2 In our review of the Maple Ridge subdivision we found an excess in pond capacity of 0. 18 ac-feet . The required ponding for Minnewashta Heights is 0. 04 ac-feet . By directing as much as possible of the Minnewashta Heights drainage to the Maple Ridge ponds we will achieve two benefits . Ponding will be provided , and the drainage will be controlled onto the adjacent properties via ponding and the baffle skimmer . I The major potential problems with this subdivision could occur during construction . To reduce this major problem area we are proposing a double row of erosion control barrier of hay bales and silt fences at the bottom of the slope areas proposed to be graded. A second issue involved with this plat was providing landscaping on the East property line. We have provided for berms and a total of 21 pine trees to be located along this line to provide for the requested landscaping . We trust that the major issues of this plat have been addressed properly . If additional concerns arise during your discussions of this plat we will try to accommodate them as much as possible . Very truly yours , WILLIAM R. ENGELHARDT ASSOCIATES , INC. , . William R. Engelhardt WRE/ las cc : Ms . Ellie Schawaba 1 1 I 1 1 MINNEWASHTA HIGHLANDS DRAINAGE INFORMATION AND CALCULATIONS RUNOFF AREAS PRIOR TO DEVELOPMENT: Drainage to the Southwest = 0. 35 acres Drainage to Minnewashta Parkway and North in existing ditch = 0 .62 acres Drainage to the East and off the site = 1 . 25 acres RUNOFF AREAS AFTER DEVELOPMENT: Drainage to the Southwest = 0. 39 acres Drainage to Minnewashta Parkway and North in existing ditch = 0 . 77 acres Drainage to the East and off the site = 1 . 06 acres CONCLUSIONS : 0 . 04 acre increase in area draining to the Southwest after development . 11 0. 15 acre increase in area draining to Minnewashta Parkway and North in existing ditch after development . 0 . 19 acre decrease in area draining to the East and off the site after development . MAPLE RIDGE Determine pond size for storage of a 24-hour , 100-year storm: ' 4 . 8 acre drainage area before development of Maple Ridge. 0 . 62 acre drainage area before development of Minnewashta 1 Highlands . Total area = 5 . 42 (See stormwater storage determination sheets ) ' Calculations determine a storage area of 0 . 23 Ac . Ft . is needed . Maple Ridge grading plan show a proposed pond ( to the 950 . 0 contour ) of 0 . 41 Ac. Ft . Excess storage capacity = 0 . 18 Ac . Ft . 1 1 1 II 4 STORMWATER STORAGE DETERMINATION WILLIAM R. ENGELHARDT ASSOCIATES, INC. 1 Consulting Engineers 1107 Hazeltine Boulevard IChaska, Minnesota 55318 tr (612)448-8838 Project Name: )911rn e, ,i.r r;n _ 4,61-, inntI s Date: 3A./B s I Location: CAa,7/Jgfie'? V Project No. Storm Frequency /-, Owner: F// Sc-`ii € _- The following are detailed steps for the determination of allowable I release rate and the required flood storage capacity. I. Determination of Allowable Release Rate - Undeveloped Site : I 1 . Area of site n. c, -a acres 2 . Average ground slope t8 foot/fli 3 . Overland flow distance L U feet 4. Overland flow time of concentration Zs-. minute 5 . Average slope of channelized flow foot/fJI 6. Channelized flow distance feet 7. Channelized flow time of concentration - minute" 8. Total time of concentration (line 4 + line 7) 2 ;"" minutes 9 . Rainfall intensity for Ine- year storm, I (the time duration on line 8) inches/h 10. Runoff coefficient J ' 11 . Allowable release rate, ( line 1 x line 9 x line 10)Q=CIA 1.07:- cfs. (Use this release rate for calculations in Col.D of Note : For flow in a well defined channel determine time of concentratic` from measured lengths , cross-sections and slopes and submit necessary calculations and drawings . II. Determination of Reservoir Size - Developed Site : I 12 . Impervious drainage area acres II 13. Pervious drainage area acres II 14 . Composite runoff coefficient (7, C, 15 . Determine flood reservoir capacity (see Page 2) II 16 . Required reservoir capacity acre-fee 1 1 II ■ I IDETERMINATION OF REQUIRED STORM WATER DETENTION ONE YEAR STORM A B C D E Intensity For Inflow Rate Stored Rate Reservoir Size Duration Time 1 yr. Storm (Line 1 x Line 14 (Col.0-Line 11) (Col.A(Hrs)xCol.D I (Hrs. ) (Min.) (In./Hr.) x Col.B) (cfs) (cfs) :12)(Acres-Ft. ) 0.17 10 3.4 0.33 20 2.5 I 0.50 30 1.9 0.67 40 1.6 0.83 50 1.35 I 1.0 60 1.2 1.5 90 0.9 2.0 120 0.72 3.0 180 0.54 I4.0 240 0.42 _` TEN YEAR STORM A B C D E IIntensity For Inflow Rate Stored Rate Reservoir Size Duration Time 10 yr. Storm (Line 1 x Line 14 (Col.0-Line 11) (Col.A(Hrs) x Col.D (Hrs. ) (Min. ) (In./Hr.) x Col. B) (cfs) (cfs) : 12) (Acre-Ft) I 0.17 10 5.6 0.33 20 4.1 0.50 30 3.3 I 0.67 40 2.7 __ 0.83 50 2.4 1.0 60 2.1 I 1.5 90 1.5 2.0 120 1.3 3.0 180 0.9 4.0 240 0.72 IONE HUNDRED YEAR STORM A B C D E IIntensity For Inflow Rate Stored Rate Reservoir Size Duration Time 100 yr. Storm (Line 1 x Line 14 (Col.0-Line 11) (Col.A(Hrs) x Col.D . (Hrs.) (Min.) (In./Hr.) x Col.B)(cfs) (cfs) = 12)(Acre-Ft) II0.17 10 8.4 317- z /0 2_2:3 0.33 20 6.2 2' = / x• 29 0 0�c ✓ II 0.50 30 4.8 J• 7? (2 r7 ,� ?z 0.67 40 4.0 /.y 9 0 y 7 0. z 0.83 50 3.5 / B 1.0 60 3.1 //5 U 13 • I 1.5 90 2.3 2.0 120 1.85 3.0 180 1.35 II4.0 240 1.1 I I II 1 • STORMWATER STORAGE DETERMINATION WILLIAM R. ENGELHARDT ASSOCIATES, INC . i Consulting Engineers 1107 Hazeltine Boulevard Chaska, Minnesota 55318 r (612)448-8838 Project Name : ) Iy;y-APL, (,. �-f e l� salt 1, S Date: 3 G. /e I Location: CJ- 0, , ;scn Project No . / r Storm Frequency /.�^r. ' Owner: 4; ice,/ .7L0 pore/ 5/7 e- /7141x/A=- '4 :719e - ail ylor+h1 The following are detailed steps for the determination of allowable release rate and the required flood storage capacity. I. Determination of Allowable Release Rate - Undeveloped Site: I 1 . Area of site 5. 4/`/ acres 2 . Average ground slope /2' 0 foot/foil 3 . Overland flow distance :32,0 feet 4 . Overland flow time of concentration / 5 minutes 5 . Average slope of channelized flow foot/f000 6 . Channelized flow distance feet 7 . Channelized flow time of concentration minutes " 8 . Total time of concentration (line 4 + line 7) / ' minutes 9 . Rainfall intensity for ) n U year storm, I (the time duration on line 8) 7 2 inches/hr 10. Runoff coefficient 7 3 I 11 . Allowable release rate , ( line 1 x line 9 x line 10)Q=CIA // 7.5" cfs. (Use this release rate for calculations in Col . D of Note : For flow in a well defined channel determine time of concentratioll from measured lengths , cross-sections and slopes and submit necessary calculations and drawings . II. Determination of Reservoir Size - Developed Site : 12. Impervious drainage area acres 13 . Pervious drainage area acres 14 . Composite runoff coefficient C, 15 . Determine flood reservoir capacity (see Page 2) , 16 . Required reservoir capacity acre-feet 1 i I I . IDETERMINATION OF REQUIRED STORM WATER DETENTION ONE YEAR STORM IIA B C D E Intensity For Inflow Rate Stored Rate Reservoir Size Duration Time 1 yr. Storm (Line 1 x Line 14 (Col.0-Line 11) (Col.A(Hrs)xCol.D II (Hrs.) ( Lin. ) (In./Hr.) x Col.B) (cfs) (cfs) :12)(Acres-Ft.) 0.17 10 3.4 0.33 00 . II 0.50 30 1.9 0.67 40 1.6 0.83 50 1.35 I 1.0 60 1.2 1.5 90 0.9 2.0 120 0.72 II 3.0 180 0.54 4.0 240 0.42 TEN YEAR STORM II A B C D E Intensity For Inflow Rate Stored Rate Reservoir Size Duration Time 10 yr. Storm (Line 1 x Line 14 (Col.0-Line 11) (Col.A(Hrs) x Col.D (Hrs. ) (Min. ) (In./Hr. ) x Col. B) (cfs) (cfs) : 12) (Acre-Ft) r0.17 10 5.6 0.33 20 4.1 - 0.50 30 3.3 . I 0.67 40 2.7 0.83 50 2.4 1.0 60 2.1 I 1.5 90 1.5 2.0 120 1.3 3.0 180 0.9 4.0 240 0.72 ONE HUNDRED YEAR STORM I A B C Inflo D E Intensity For Inflow Rate Stored Rate Reservoir Size Duration Time 100 yr. Storm (Line 1 x Line 14 (Col.0-Line 11) (Col.A(Hrs) x Col.D II (Hrs.) (Min. ) (In./Hr.) x Col.B)(cfs) (cfs) = 12)(Acre-Ft) 0.17 10 8.4 277'`.7 I5 LS 0 Zz 0.33 20 6.2 Zip.= R -:" U,Z ✓ II 0.607 40 4.0 1 5-a� 13./ / 0.83 50 3.5 //-4/ 1.0 60 3.1 _W. ) 1.5 90 2.3 7 s 2.0 120 1.85 3.0 180 1.35 II4.0 240 1.1 I II II . CIT'C' OF 1 --,‘ \ i CE -11, 1 : ASSEN 1 L..1 • 1 ` I 690 COULTER DRIVE • P.O. BOX 147 • CHANHASSEN, MINNESOTA 55317 (612) 937-1900 December 19, 1988 II Mr. James Jasin 7301 Minnewashta Parkway II Excelsior, MN 55331 Re: Maple Ridge Subdivision Storm Water Detention Pond II File No. 85-5 (pvt) Dear Mr. Jasin: I am following up on our telephone conversations and your December 1, 1988 II letter which states your concerns for the fill material which has been placed in the City's storm water retention basin in the Maple Ridge subdivision. As we II have discussed, Mr. Ron Julkowski, the City's building inspector, has been in contact with the property owner who has been filling this pond site. He has directed the property owner to restore this ponding area to its original state. Ron informs me that if not accomplished in the near future this will be done as II soon as weather permits in the spring. I have asked Ron to keep you closely informed of progress on this matter. The attached sketch shows the original contours for this detention pond. It is II our intent to have this matter rectified as soon as possible. Weather may not allow this; however, I believe that, barring any catastrophic runoff event, that there remains sufficient capacity and drainage swales in the area to accommodate II runoff such that your property located at 7301 Yiinnewashta Parkway would not be in danger. Again, we hope to resolve this in the near future and Mr. Julkowski will stay II on top of this to see that it is accomplished. If you have any further questions, please feel free to call Ron at 937-1900. II Sincerely, CITY OF CHANHASSEN I 1 41. (-0 _4 — Gary Gu. Warren- P.E. II City Engineer GGW:ktm 1 Attachment: Detention Pond Map. cc: Ron Julkowski, Building Official (w/attachment) 1 Allan Larson, Engineering Technician (w/attachment) 1 II ' - N - ' . .-,44 t-- I _ .. -c - ,1:-. 4....- k4. • . kkii...,11 At :‘ _...,.;,4„7- IN7441AteZ .\ ‘ Iti . I . 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