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APR y Q 1995 <br />• <br />B.A. LIESCH ASSOCIATES, INC. 1340015TH AVE. N. MINNEAPOLIS, MN 55441 612/559-1423 FAX: 612/559-2202 <br />MEMORANDUM <br />TO: STEVE ROHLF, CITY OF ELK RIVER <br />FROM: JOHN LIGHTER, B.A. LIESCH ASSOCIATES, INC. A~ <br />DATE: APRIL 18, 1995 <br />RE: CUSTOM MOTORS, PROPOSAL FOR ADDITIONAL SUB- <br />SURFACE ASSESSMENT WORK <br />Assessment activities to date have consisted of reconnaissance soil sampling and testing <br />of off-site wells on Property north and anticipated downgradient of the Custom Motors <br />site. Presently, environmental impacts appear limited to surficial soils in high traffic <br />areas, including, but not limited to, the engine and transmission storage area, vehicle <br />processing areas and traffic pathways. Soils in the vicinity of typical automobile storage <br />areas do not appear to be problematic, as previous field screening and analytical testing <br />work did not indicate parameters above detection limits, although some minor staining <br />was observed in these areas. Also, testing of off-site wells did not find any evidence of <br />volatile organic compounds (VOCs), although lead was present slightly above drinking <br />water standards. <br />An overview of data indicates additional soil sampling and analytical testing is required <br />to further define the extent and magnitude of impacts, in particular near the processing <br />garage and engine/transmission storage area. Additionally, TCLP analyses may be <br />required on soils with high lead levels to evaluate mitigation and disposal options to <br />determine if the soils would be regulated as hazardous material. There also remains the <br />possibility of localized groundwater contamination suggested by data from the <br />engine/transmission storage area, permeability of soils and anticipated shallow depth for <br />groundwater. Based upon these concerns, Liesch has developed the following scope of <br />work to address these issues. <br />Liesch proposes to spend one field day advancing a series of shallow soil borings (Figure <br />1) on the Properly. Soil borings will be advanced to the water table which is anticipated <br />to occur at a depth of approximately 10 to 15 feet below grade. Soil samples will be <br />• collected at five foot intervals during drilling for soil characterization and profiling needs <br />and groundwater samples will be collected from selected boreholes for groundwater <br />quality data. All drilling will be completed by a truck mounted drill rig utilizing hollow <br />