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Waiver of Plat Requirements-Bellgrove Area• PLANNING COMMISSION REPORT NO. WVR86 -2 BACKGROUND: Nature of Request: Name of Applicant: Address of Property: Present Zoning: Reason for Request: McvnoRnytor Nancy S Anderson Communi y Development Analyst WAIVER OF PLATTING REQUIREMENTS BELLGROVE AREA CITY OF HOPKINS JANUARY 16, 1986 PURPOSE: To review and recommend action on a Waiver of Platting Requirements to divide the lot at One Loring Road To divide a single lot of 66,752 square feet into two lots of 36,315 square feet and 30,447 square feet. Marvel Eggum One Loring Road R -1 -D Higher tax base and better land use. The subject property is zoned R -1 -D which requires 20,000 square feet of lot area. The easterly most lot of the division would contain 36,315 square feet and a westerly lot of 30,447 square feet. The proposed lot would have a front- age of 220 feet on Minnetonka Boulevard. The applicant is proposing to have access to the proposed lot on Minnetonka Boulevard, however, if access is not granted from the County, access will be from Loring Road. If access is granted on Minnetonka Boulevard, the strip of land to Loring Road will become a utility easement. The City Engineer has noted that there will be a sewer and water connection charge. A similar division was approved by the Zoning and Planning Commission in April 1985 at 6 East St. Albans Road. It has been standard policy for the Commission to grant a waiver of the plat on a single division provided the lots created are legal and with approval contingent upon acceptance by Hennepin County Recorder of the division. ANALYSIS: The applicant has requested -a waiver of the plat in order to construct a single family home. The proposed lots will comply with the minimum lot require- ments. A single family dwelling is the only permitted use with the exception of a park in an R -1 -D district. RECOMMENDATION: I recommend approval of the waiver of the platting requirements based on the fact that two conforming lots will be created. The following find- ings of fact are suggested should the commission recommend approval: Resolution recommending approval 1. That the waiver of the plat will form two conforming lots 2. That a single family dwelling may be built on the proposed lot . That the proposed lots conform to all requirements of the City's zoning ordinances. • ATTN: Civil Engineers Land Surveyors Planners Valley Engineering Co., Inc. City of Hopkins Department of Planning 1010 South 1st Street Hopkins, Minnesota 55343 Storm Event • 10 year 100 year Nancy Anderson 4.15 (612) 447 -2570 P.O. Box 478, Suite 120C 16670 Franklin Trail S.E. Prior Lake, Minnesota 55372 February 7, 1986 Subject: Lot 5, Block 5, Bellgrove. We have reviewed the impact of building in the split portion of Lot 5 and conclude the following. The proposed lot split is located near the lower elevations of a 7.27 acre drainage area. Runoff collects in a depression alongside of Minnetonka Boulevard. There is apparently no culvert or storm sewer at this location to drain the depression. Approximately 0.37 acre feet of ponding capacity is available. If flooding were to occur, then the stormwater would overflow the driveway on the east end of the depression and continue to flow east in the roadside ditch. Present hardcover occupies approximately 1.21 acres which is 16.6% of the drainage area. Construction of a house, driveway and garage in Tract B would add another 0.10 acres of hardcover thereby increasing the percentage to 18.0% of the total drainage area. The effects of this increase are shown in the following table. 24 Hour Amount of Volume Rainfall Runoff of Runoff in inches in inches in acre feet Before After Before After 0.35 0.38 0.21 0.23 6.00 1.07 1.14 0.65 0.69 If ponding did occur the increase in the volume of runoff could be measured as 5/8 inch more ponding depth as a result of the 10 year, 24 hour storm. The 100 year storm would overflow to the east in either case and could not be measured. Although the effects of runoff as a result of building can be quantitatively estimated, the measurable differences would be so slight in this case that virtually no significant impact could be observed. More noticable effects such as erosion and sedimentation would rather draw attention and should be mitigated by construction of silt fencing across the eastern corner of the site. It is recommended that geotextile fabric in accordance with the attached detail drawings be installed. I hope that this information answers your concerns. If you have questions, please contact me. cc Mary Eggum SDH /cmy Sincerely, Steven D. Harvey, P.E. • WIRE MESH REINFORCEMENT (OPTIONAL) METAL OR WOOD POST OR STAKE DIRECTION OF RUNOFF FLOW •..•,.. NATURAL'' SOIL el • SUPPORT POST ANCHORAGE, VARIES FROM IN -SITU SOIL TO CEMENT MORTAR • ENGINEERING FABRIC FABRIC ANCHORAGE W / TRENCH BACKF TAMPED NATURAL SOIL 6 IN. MIN.:•'•' • • • •• • • • . . 6 IN. MIN. • NOTE: DEPENDING UPON CONFIGURATION, ATTACH FABRIC TO WIRE MESH W/ HOG RINGS, STEEL POSTS W/ TIE WIRES, WOOD POSTS • W/ STAPLES Design Details for Use of Bn*inaerina Fabric in Silt Fence Construction Sequential Procedures Used in Silt Pomo OUSItEMctLos STEPS IN CONSTRUCTION OF A SLLT FENCE • • • • • February 13, 1986 TO: Zoning and Planning Commission FROM: Nancy Anderson SUBJECT: 1 Loring Road CITY OF HOPKINS The applicant has submitted a footprint and plans of homes that may be built on the subject site. An engineers report was also submitted which shows the various water runoff once the parcel is developed.