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WALLACE • KUHL Er ASSOCIATES,INC. <br /> December 3, 1990 1 <br /> San Joaquin County Public Health Services <br /> Environmental Health Department <br /> Attention: Casey Foley <br /> 1601 E. Hazelton Ave. <br /> Stockton, California 95201 <br /> WORKPLAN FOR SUBSURFACE SOILS EVALUATION <br /> U.S. SPRINT <br /> 6855 W. Eight Mile Road <br /> Stockton, California <br /> WKA No. 1004.41 <br /> Introduction <br /> As requested by Jeff Post of Post Tank, we are submitting this workplan for a subsurface soils <br /> evaluation at the U.S. Sprint property at 6855 W. Eight Mile Road. Previous work on the property <br /> performed by GHH Engineering, Inc. has included soil sampling in the area of the tank and product <br /> line. The five soil samples were tested for TPH and BTX&E; all samples contained non-detectable <br /> concentrations of these compounds (less than 10 mg/kg for TPH and less than 10µg/kg for BTX&E) <br /> with the exception of sample T3,which contained some toluene,xylene and ethyl benzene. Complete <br /> test results are appended. The purpose of our work is to obtain confirmatory samples for laboratory <br /> testing of TPH and BTX&E at four of the previously sampled locations shown on Plate 1. <br /> Proposed Scope of Word <br /> The scope of our work will include the drilling and sampling of two soil borings to a maximum depth <br /> of 20 feet at former locations T1 and 13 shown on Plate 1. Additionally, sail samples will be <br /> obtained along the former product piping alignment at a depth of three to five feet (former samples <br /> P4 and PS). The borings will be advanced using a rotary drill rig with hollow-stem augers to a depth <br /> just below the concrete pad encountered at ten feet by GHH Engineering. Soil samples will be <br /> obtained at the base of the borings (10 to 15 foot depth) using a modified California sampler <br /> containing two-inch diameter brass tubes, cleaned with trisodium phosphate. The borings will be <br /> terminated immediately after sampling if ground water is encountered Soil cuttings will be evaluated <br /> c. [ � .3 � OSSbr '� ZHCl}= + 3 � VZZtiM* iqa T,- T . = T t1 F 'Co = T..� <br />