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2020_07-28_PWETCpacket
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2020_07-28_PWETCpacket
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Public Works Commission
Commission/Committee - Document Type
Agenda/Packet
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7/28/2020
Commission/Committee - Meeting Type
Regular
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impacted. The Site falls within the Rice Creek Watershed Flood Zone <br />Management Zone. Therefore, the runoff rates from the site must provide at <br />least a 20% reduction in the runoff rates. This reduction will reduce the flows in <br />Ditch 4 and reduce downstream flooding. <br />12.Contamination/Hazardous Materials/Wastes <br />a. Pre -project Site Conditions - Describe existing contamination or potential environmental <br />hazards on or in close proximity to the project site, such as soil or groundwater <br />contamination, abandoned dumps, closed landfills, existing or abandoned storage <br />tanks, and hazardous liquid or gas pipelines. Discuss any potential environmental effects <br />from pre -project site conditions that would be caused or exacerbated by project <br />construction and operation. Identify measures to avoid, minimize, or mitigate adverse <br />effects from existing contamination or potential environmental hazards. Include <br />development of a Contingency Plan or Response Action Plan. <br />MPCA's What's In My Neighborhood (WIMN) database was reviewed to determine if any <br />known contaminated properties or potential environmental hazards are located on the <br />project site or within 100 feet of the project site, and 20 sites were identified (see Table 5 <br />and Figure 5). Of the 20 sites, 11 have activities that are listed as active. Using the <br />following criteria established by the Minnesota Department of Transportation (MnDOT), <br />the sites were classified into high, medium, and low risk sites: <br />• High risk: In general, sites with high environmental risks are properties that have <br />documented releases of chemicals or hazardous or regulated substances (e.g., <br />active and inactive state and federal cleanup sites, active and inactive dump <br />sites, and active leaking underground storage tank sites), strong evidence of <br />contamination (e.g., soil staining, stressed vegetation), or storage of large <br />volumes of petroleum or other chemicals (e.g., bulk storage tank facilities). <br />• Medium risk: Sites of medium environmental risk are properties where smaller <br />volumes of petroleum, chemicals, or hazardous materials are frequently stored <br />and used (e.g., registered underground and aboveground storage tanks, vehicle <br />repair facilities, metal working shops), but at which no evidence of spills or <br />releases exists, or properties with documented releases that have been "closed" <br />(signifying no further cleanup actions deemed necessary) by the MPCA. Closed <br />sites, such as closed leaking underground storage tank sites, are considered <br />medium risks because residual soil or groundwater contamination may exist. <br />• Low risk: Low environmental risk sites include properties where minor volumes of <br />chemicals or hazardous materials have been used or stored (e.g., hazardous <br />waste generators, and possibly some farmsteads and residences). <br />Table 5: MPCA WIMN Sites Within 100 Feet of the Project Site <br />Rosedale Center EAW 11 February 2020 <br />
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