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Q <br /> s , <br /> WALLACE • KUHL&ASSOCIATES.INC. <br /> GEOTECHNICAL CONSULTANTS CONSTRUCTION TESTING <br /> October 30, 1990 <br /> San Joaquin County <br /> Environmental Health Division <br /> Attention: Eleanor Ratliff <br /> P.O. Box 2009 <br /> Stockton, California 95201 <br /> WORKPLAN FOR SOILS REMEDIATION/GROUND WATER INVESTIGATION <br /> LATHROP PROPERTY <br /> 91 East Thomsen Road <br /> Lathrop, California 95241 <br /> WKA No. 1184.02 <br /> Introduction <br /> We are submitting this workplan for soils remediation and a ground water investigation for the <br /> subject property. The property consists of approximately three acres of undeveloped, fallow land <br /> comprising one parcel in Lathrop, California. An analysis of stereoscopic aerial photographs dating <br /> back to 1963 and interviews with persons familiar with the property history revealed that the property <br /> was once 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 1960s. <br /> The subsurface fuel tanks are said to have been removed in the early 1970s. <br /> Sail borings drilled on the property during our Environmental Site Assessment, report dated <br /> September 21, 1990, indicated shallow subsurface soils contamination in the vicinity of the <br /> southwesterly corner of the property. Subsurface soil samples from Boring P1 at ten feet below <br /> existing grade contained total petroleum hydrocarbon concentrations of 22,000 parts per million <br /> (ppm); the soil sample at 15 feet below existing grade at location P1 contained a relatively low <br /> concentration (5.8 ppm) of petroleum hydrocarbons. Ground water was consistently encountered in <br /> the borings at a depth of ten feet; preliminary ground water sampling and testing performed during <br /> our Environmental Site Assessment of the property indicated potential ground water contamination <br /> by petroleum hydrocarbon constituents. <br /> 3050 INDUSTRIAL BOULEVARD • PO BOX 1137 • WEST SACRAMENTO,CA 95691 • (916)372.1434 • FAX(916)372-2565 <br />