02/09/2005 P&Z Packet - Laserfiche WebLink

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Oakwood View Page 2 January 20, 2005 City of Lino Lakes, Minnesota Introduction As explained in previous memorandums, the proposed Oakwood View plans provide for essentially two different improvements on different sides of the property. This includes a new street and utilities that provide for 10 single family units on the north side of the property, along with the construction of an enabling residence (duplex) and parking area adjacent to the existing church on the south side of the property. Remaining portions of the property (center and northeast) not proposed for improvements are essentially wetland and/or wooded areas. • Geotechnical 1. A geotechnical report has been provided (GME, May 14, 2004). The report mentions that at the time of the investigation (April 2004), the groundwater levels were probably lower than normal, and that levels may be higher at the time of construction. This may have an impact on construction. Building elevations (low floor, lowest opening, etc.) must be constructed in accordance with the minimum requirements of the City of Lino Lakes as further described in this memorandum. 2. Per the geotechnical report, it is expected that dewatering will be required for installation of the sanitary sewer and water. The applicant shall be responsible for attaining any permits as required for de- watering. 3. The report indicated that much of the soil consists of silty sands. For the building and paved areas, soft, loose, or unsuitable soils must be removed and replaced with granular materials per the geotechnical engineer's recommendations in the report. Bedding for utility foundations shall also be prepared in accordance with the report. It is recommended that the geotechnical engineer be retained and consulted throughout the construction process. Drainage 1. An outlet control structure is shown for Pond 11 (NW Pond) on the Utility Plan. However, the invert elevation of the receiving manhole (STMH -6 on the Grading Plan) is 891.8 which is higher than the invert of the existing CB 15 -2A on Oakwood Lane (889.24 as stated on the plan). Assuming that all drainage is intended to flow to the west, this would result in back pitch (or flow to the east) to the existing CB and result in standing water in the CB. It is suggested that the invert of the proposed STMH 6 be lowered to match the invert of the existing pipe to allow proper flow to the west. 2. The Grading Plan provides floor elevations for the proposed housing units (3 -4 different elevations are provided for each unit). A legend must be provided that clarifies what the individual elevations refer to (i.e., walk -out, garage floor, first floor, etc.). This information is critical in order to verify that City requirements are being met as follows: The lowest floor elevations must meet the City's minimum requirement of 2 feet above the 100 year flood level, and 4 feet above normal water elevations and groundwater. In addition, the lowest building opening must be at least one foot above