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01/02/96 17: 1S ^612 937 5S22 «EST«UUD FRU 5NZ) LL.,Ulb DRAFT—Silver Lake Center EAW Page 14 January 2,1996 ` of stormwater off-site,obstruct on-site water Infiltration and minimize the potential for groundwater contamination. As noted under Item 13.a.,there are no known abandoned or unused municipal or domestic wells on the ilte. However,the site does Include three groundwater monitoring wells that eventually will need to be abandoned in accordance with Minnesota Department of Health well abandonment regulations. The conveyance of the stormwater from the site to stormweter ponds and then to municipal storm sewers will Increase on-site Infiltration beneath ponding areas. Ponds A-C would occur in areas that do not have Impacted soils,end therefore would not Increase likelihood of pollutant conveyance to groundwater relative to current conditions. Pond D may be located in an area downgradlent from the off-site source groundwater plume. All necessary regulatory agencies will be consulted to ensure that pond installation.does not increase the potential for increased contaminated groundwater movement. Although the some groundwater beneath the site Is known to contain low levels of contaminants from an off-site Source,the proposed project Is not expected to Increase the potential for future releases of contaminants that could Impact groundwater below the site for the following reasons: • The proposed project would revitalize existing land uses. • The majority of the site will be covered by impervious surfaces. • The proposed underground storage tanks will be Installed and monitored in accordance with=standards. • All wastewater will be conveyed to the sanitary sewer system. • Substantial site cleanup has'and w111.0ccur as a direct result of this redevelopment. Project proposers will ensure that site design will not Interfere with ongoing monitoring activities. If deemed necessary,the monitoring wells may need to be abandoned and replaced with other wells located on the site in order to accommodate building demolition and site redevelopment. c. Identify any toxid or hazardous.materials to be used or present on the project site and identify measures to be used to prevent them from contaminating ground water. An overview of the-hazardous materials currently/previously located on the site Is Included under Item 9. At this point In the planning process,a complete determinations of hazardous materials that may be used on the site is not possible. However,based on the uses proposed,the site would Involve installation of three or four petroleum underground storage tanks for the proposed gas station and possibly a waste oil tank for the proposed oil change store. As noted under Item 20.b,all underground storage tanks would be installed and monitored In accordance MPCA standards. 21. Solid Wastes;Hazardous Wastes;Storage Tanks a. Describe the types,amounts,and compositions of solid or hazardous wastes to be generated,including animal manures,:sludges and.ashes:Identify the.method and location of disposal. For projects generating municipal solid waste indicate if there will be a source separation plan;list type(s)and how the project will be modified to allow recycling. . It Is anticipated that solid waste generation will be typlcal of developments of this sort and will likely be in the range-of tons per year. This estimate is based on the calculations shown In Table 7. Westwood Professional Services,Inc. ��•