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WALLACE • KUHL&ASSOCIATES.INC. <br /> GEOTECHNICAL CONSULTANTS • CONSTRUCTION TESTING <br /> June 20, 1990 <br /> San Joaquin County <br /> Environmental Health Division <br /> Attention: Eleanor Ratliff <br /> P.O. Box 2009 <br /> Stockton, California 95201 <br /> WORK PLAN FOR ENVIRONMENTAL ASSESSMENT <br /> LATHROP PROPERTY <br /> 91 East Thomsen Road <br /> Lathrop, California 95241 <br /> WKA No. 1184.02 <br /> Introduction <br /> We are submitting this work plan for an environmental assessment of the subject property. The <br /> purpose of our work is to determine the extent of on-site petroleum hydrocarbon contaminated <br /> soils discovered during an exploratory soils boring program performed as part of a <br /> preacquisition site assessment of the subject property. <br /> Site Review <br /> The property consists of approximately three acres of vacant land comprising one parcel in <br /> Lathrop, California. An analysis of stereoscopic aerial photographs dating back to 1963 and <br /> interviews with persons familiar with the property history revealed that the property was once <br /> the site of an automobile service station. The station had been known as Wiggins Trading <br /> Post, which utilized subsurface fuel tanks; we understand the facility ceased operation in the <br /> 1960s. The subsurface fuel tanks are said to have been removed in the early 1970s. <br /> We performed a preacquisition site assessment of the property in April, 1990. Our work <br /> included the drilling of eight shallow borings with a truck-mounted drill rig in the area of the <br /> 3050 INDUSTRIAL BOULEVARD PO BOX 1137 , WEST SACRAMENTO,CA 95691 ' (916)372-1434 • FAX(916)372-2565 <br />