Agenda - Council - 01/28/1986 - Laserfiche WebLink

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Ms. Anne Norris Page Two January 10, 1986 with soil test results and appropriate ground water measurements that the indi- vidual on-site treatment systems can feasibly be constructed and will not cause a ground water contamination problem. For the proposed commercial deve- lopment, a high rate soil absorbtion system evaluation should be conducted. The EIS should also contain a discussion about alternate methods of wastewater treatment and disposal since item 16 in the scoping EAW and in attachment A indicates that the project area contains steep slopes with highly erodible soils which are not suitable for on-site septic tank drainfields. Please contact Larry Zdon of the Division of Water Quality's Technical Review Unit at 296-7214 to set up a meeting to discuss what specific information is needed for the EIS with regard to wastewater treatment. . The EIS should also contain a discussion about project related stormwater. With regard to surface water quality, both the City and the project proposer are urged to pursue reasonable design features to maximize the detention and infiltration of runoff waters from the site. For example, drainage from parking areas, and other impervious surfaces should be routed over grassy or landscaped areas prior to collection to create opportunities for treatment and disposal of stormwater by overland flow. Such measures would limit increased hydraulic or pollutant loading associated with the additional stormwater runoff from the site. Air .qu. al ity, Traffic and Noise With regard to air quality, an indirect source permit (ISP} is required for the project and should have been listed under Item ll of the scoping EAW. Minnesota Rules Chapter 7001.1250 - 7001.1350 require an ISP for certain projects that involve the construction of more than 1,DO0 parking spaces. We recommend that the necessary traffic, air quality and noise information required for the ISP for the project be developed concurrently with EIS preparation and that modeling results be contained in the EIS. Please contact Susanne Pelly of the Division of Air Quality at (612) 296-7723 regarding information required for the ISP including background carbon monoxide default values to be used for the air quality analysis. The EIS should contain a discussion about access of project traffic onto local trunk highways, including Trunk Highway 10/169 which is located to the south of the project site. The staff is also concerned that noise levels due to traffic on Trunk Highway 10/169 may exceed state noise standards. Minnesota Rules Chapter 7010 require that a daytime LIO level of 65 dBA and a nighttime LIO level of 55 dBA for land use category NAC-1 at the proposed residential units or a daytime and nighttime LiO of 70 dBA at the proposed commercial development, not be exceeded. The staff recommends that noise levels from nearby roadways be evaluated in the EIS to determine if the state noise standards will be exceeded. The total average daily traffic derived from existing traffic and traffic from the proposed devel- opment should be used for this assessment. If the state noise standards are to be exceeded due to traffic on this roadway, the City should ensure that the proposer implements noise control measures to come into compliance with the state standards. For example, possible noise