08-28-1996 Council Agenda - Laserfiche WebLink

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DATE: TO: FROM: RE: FILE: MEMORANDUM August 9, 1996 Scott Tangen Paul Heuer Stoneridge Development 372 Genera1/372 -234 Bonestroo Rosene Anderlik & Associates Engineers & Architects I have received and reviewed the grading and utility plans dated July 26, 1996 for the above mentioned project and offer the following comments: SANITARY SANITARLSEBILLILMLITEKILIIIN All sanitary sewer having a cover of less than 6-1/2 feet must be insulated with high density foam insulation. The water main is missing some important notes: - DIP should be labeled as Class 52 - existing vs new water main is not designated by either labels or different symbols - method of connection to existing water main is not labeled kll • ' U a/' , 11 . , 1t. • . The 55 foot radius curve in the street does not pass minimum standards for 30 mph (275 foot). If Council chooses to accept this plat configuration, the owner must provide appropriate warning signing for southbound traffic. The cul-de -sac proposed has a diameter of 82 feet from curb face to curb face. The City's standard cul -de -sac has a 90 foot diameter from curb face to curb face. This requirement must be met in order to accommodate turning movements of school buses and emergency vehicles. This will lead to a right -of -way of 120 foot diameter. The storm sewer line across Lots 3 and 4 must be accompanied by a permanent utility easement 20 feet wide. The City's new standard street section includes geotextile fabric, 1 foot of select granular material, 8 inches of 100% crushed class 5 aggregate base, 1 -1/2 inches of bituminous base. and 1 -1/2 inches of bituminous wear. In addition, drain tile may be required, depending what the soil borings show, We are concerned about the drainage patterns of this development during storm events with intensity greater than a 5 -year storm. Our concerns are related to 1) the appearance that water will overflow into the north sides of Lots 9 and 1 in addition to the designated area south of Lot 3, and 2) the depth and area of the ponded water before it overflows. Residents of this development are likely to be afraid during heavier rainfalls, The owner should work out a more defined overflow location that will bring pending depths to a more tolerable level. Depending on the current drainage patterns along the southern ditch of C.R. D, a culvert may be needed beneath the proposed street at it's connection to C.R. D. MISCELLAIS Soil borings shall be submitted to the City for use in evaluating the proposed grading plan, pavement design, pipe bedding, the need for drain tile, and the water table elevation. LZ6:0N ZO /ZO: OS :LL 96/60/20 Page 8 S31VTDOSSV 00211S9NOg