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Environmental • <br /> Science & <br /> Engineering,Inc. <br /> .C,«owo�.., RECEIVED <br /> MAY 2 2 9901 <br /> ENVIRONMENTAL HEALTH <br /> PERMIT/SERVICES <br /> April 30, 1990 <br /> Proposal No. 90-M-088 <br /> Mr. James Brathovde <br /> Central Valley Regional Water Quality Control Board <br /> 3443 Routier Road <br /> Sacramento, CA 95827-3098 <br /> SUBJECT: Work Plan for Site Investigation of former Surface Impoundment at Delta <br /> Truck Sales, Stockton,San Joaquin County, California <br /> Dear Mr. Brathovde: <br /> Environmental Science & Engineering, Inc. (ESE) has been retained by Delta Truck Sales, <br /> 3535 Cherokee Road, Stockton, to perform a site investigation of a former surface <br /> impoundment area at their facility. <br /> Background <br /> The surface impoundment area was formerly used to collect wastewater from steam <br /> cleaning trucks and truck parts. Several years ago the impoundment area was backfilled <br /> to grade with soil from the site. <br /> Initial investigation activities were conducted at this site in 1987. Analytical results of soil <br /> samples indicated soluble lead concentrations in excess of the Soluble Threshold Umit <br /> Concentration (STLC) value of 5.0 mg/L Based on these results, the Central Valley <br /> Regional Water Quality Control Board (CVRWQCB) classified the impoundment as a <br /> hazardous waste site subject to the regulations of the Toxics Pit Cleanup Act of 1984 <br /> ('PPCA). <br /> Kleinfelder & Associates supervised the excavation of a large portion of the impoundment <br /> and the surrounding area in June 1989 in an attempt to assess the vertical and lateral extent <br /> of the hazardous materials. Approximately 5,000 cubic yards of material was removed and <br /> stockpiled before field activities ceased in order to re-assess the scope of work. <br /> Figure 1 - Excavation/Sample Location Map shows the approximate extent of the <br /> excavation and soil sampling locations within the excavation. Three soil samples were taken <br /> at each location (except S-4), labeled S-1 through S-7, from depths of 1.5 to 2 feet, 8 to <br /> 597 Center Avenue,Suite 350 Martinez,CA 94553 Phone(415)372-3637 Fax(415)372-3790 <br /> C,.....e.l.,L......... � H....1o.IC.000 L.r <br />