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WALLACE • KUHL&ASSOCIATES,INC. <br /> GEOTECHNICAL ENGINEERING ENGINEERING GEOLOGY <br /> ENVIRONMENTAL CONSULTING CONSTRUCTION TESTING <br /> January 29, 1991 <br /> San Joaquin County Public Health Services PAYMENT <br /> Environmental Health Department <br /> Attention: Laurie A. Cotulla JA,4 3 0 T1211 <br /> 1601 E. Hazelton Ave. SAN JOAQU4N CCS=}'''y <br /> Stockton, California 95201 PUBLIC HEAI_T•'' ^;-±?51!,,ES <br /> ENVIRONMENTAL Fit.: I r� U;y ISION <br /> WORKPLAN FOR SITE CHARACTERIZATION <br /> SWIFT TRANSPORTATION <br /> 781 W Swift Way <br /> Stockton, California <br /> WKA No. 1004.37 <br /> Introduction <br /> We are submitting this workplan for site characterization at the subject property, located at 841 <br /> -Swift Way in Stockton, California. The purpose of this work is to properly characterize the lateral <br /> and vertical extent of soils contamination associated with the former tanks and product lines. A <br /> copy of our January 29, 1991 Soils Sampling and Testing report, containing the locations and <br /> laboratory results of samples obtained during removal of the tanks, is attached. <br /> Proposed Scope of Work <br /> Based on the test results and our field observations, we recommend the drilling and sampling of <br /> six to eight soil borings to a maximum depth of thirty feet, or to the first encounter of ground <br /> water, whichever comes first. The borings will be advanced using a rotary drill rig with hollow- <br /> stem augers at the proposed locations indicated on Plate 1. Soil samples will be obtained at <br /> maximum intervals of five feet and at changes in lithology, using a Modified California Sampler <br /> containing two-inch diameter brass tubes, cleaned with trisodium phosphate. Samples will be <br /> screened in the field with an organic vapor analyzer (OVA). Sample tubes will be sealed with <br /> aluminum foil, plastic caps and wrapped with tape. Selected samples will be preserved on ice and <br /> submitted under chain-of-custody to a California-certified analytical laboratory for analysis of total <br /> petroleum hydrocarbons (TPH), benzene, toluene, xylene and ethyl benzene (BTX&E). <br /> Samples will be selected for laboratory analysis based on conditions encountered during drilling and <br /> field screening with the OVA. Contaminated soil generated during drilling will be stockpiled with <br /> 3060 INDUSTRIAL BOULEVARD • PO BOX 1137 • WEST SACRAMENTO,CA 95691 • (916)372-1434 • FAX(916)372-2565 <br />