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DATE: <br />TO: <br />FROM: <br />RE: <br />FILE: <br />MEMORANDUM <br />May 16, 1996 <br />Scott Tango <br />Paul Heuer <br />Stoneridge Development <br />372 General /372 -234 <br />Bonestroo <br />Rosen <br />Anderlik & <br />Associates <br />Engineers & Architects <br />I have received and reviewed the grading and utility plans dated January, 1996 for the above mentioned project <br />and offer the following comments: <br />SAMTALLSEMLEILLWATERMAllti <br />The owner proposes to connect to existing City sanitary sewer and water main primarily along the southern <br />ditch of County Road D. Our records show that the trunk sanitary sewer along C.R. D may be somewhat <br />shallow and could present problems in serving all of the proposed lots by gravity. <br />The proposed 6" water main is shown having a 90 degree bend just north of Lot 4. Bends should be added <br />which would lessen the sharpness of the angle, <br />St 40 ' 1t ti al t tt:k, <br />The owner requests a one foot variance of right -of -way width at the north end of the plat. From a design and <br />safety standpoint, we have no objection to granting this variance. <br />The 55 foot radius curve in the street does not pass minimum standards for 30 tnph (275 foot). If Council <br />chooses to accept this plat configuration, we recommend that the owner provide appropriate warning signing <br />for southbound traffic. <br />The low point on the street is proposed to be placed at a location that is not near the proposed pond. It is not <br />clear where the water overflows to during heavy rainfall events. it is suggested that the low point be situated <br />adjacent to the pond, with a clearly defined overflow to the pond. If the current design is carried out, a swale <br />should be clearly defined on the grading plan at the prescribed overflow location, possibly with an easement <br />of additional width. <br />We are concerned about the drainage along the existing ditch at the west edge of this plat. It appears that the <br />area does not drain well now. The City should consider correcting this problem before this development <br />occurs. It is not clear what impact the new grading will have on this ditch. It roust be verified that drainage <br />in the ditch will not be adversely impacted. <br />Depending on the current drainage patterns along the southern ditch of C.R. D, a culvert may he needed <br />beneath the proposed street at it's connection to C.R. D. <br />296:0N 20/20:g 69:2L. 96/L6150 <br />Page 38 <br />S31VI30SSV 00211S3NO2 <br />