Agenda - Council - 08/28/2007 - Laserfiche WebLink

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Preliminary Plat Review - Regency Pond 4th Addition July 29, 2007, revised August 23,2007 Page 2 of3 Anoka County has submitted a review letter stating that a 25-foot by 25-foot triangle of right-of-way is needed for signal maintenance purposes; this must be shown on the fmal plat. Section 9.50.30 of City Code requires a cul-de-sac with a minimum right-of-way diameter of 130 feet and a minimum roadway diameter of 100 feet. A smaller cul-de-sac may be allowed, depending on anticipated traffic volume, planned function of the street, and character of abutting land use. When the City Council previo~ly reviewed plans for this site (October 19,2004 work session), they recommended a smaller cul-de-sac because traffic volume is expected to be very low. A variance to the cul-de-sac requirement v.rill be considered at the September Planning Commission meeting. Since direct access to the public roadway v.rill be eliminated by dedication to Anoka County over Lots 2 and 3, it will be necessary to record an access easement between the four lots in this subdivision. Utilities: The utility plan is being reviewed as part of the site plan submittal. The watermain through the site will be an eight inch ductile iron watermain connecting between existing watermain on Blinker Lake Boulevard and 148tb Avenue in the Regency Pond subdivision. The City will be requesting a drainage and utility easement over this watermain. Tbis easement must be a minimum of 20 feet in width, and must be sho'wn on the final plat. The sanitary sewer services. only this development and is proposed to be as shallow as 4.3 feet in some locations. The.City's standard requires 7.5 feet of cover over sanitary sewer 'without insulation. Staff is recommending that this sanitary sewer be insulated and remain a private utility. Drainage and Grading: The subject 6.2 acre parcel is. currently vacant except for a single family residence and several out buildings. At the present time the northeastern third of the property drains to the pond system located in the Regency Ponds 2nd Addition; the southern third of the property drains to a land-locked low area on the Connexus property on the south side of CR 116; and the eastern third drains into the storm water system installed in CR 56. The proposed plan will expand the Regency Ponds detention pond and transmit 98% of the site drainage to this ponding system. A grading and drainage plan has been prepared by RLK Inc and has been reviewed. Staff offers the following comments: . . Silt fence should be specified for placement around the entire site and a Storm Water Pollution Prevention (SWPP) plan should be included. . Grading 'will be required on two of the adjacent lots in the Regency Pond neighborhood. Although there are drainage and utility easements on these areas, contact should be made v.rith these property owners prior to construction. . . The maximum slope permitted is one foot vertical to four feet horizontal. Slopes on the pond areas appear to exceed this maximum slope. . . The storm sewer inverts and the pipe sizes need to be added to the plan . The number of outfaUs into the detention pond should by minimized by interconnecting storm pipe on the east side of the development. . An emergency overflow elevation and location should be added to the plan . The plan will need to be reviewed and permitted by the Lower Rum River Water Management Organization. -100- -