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tharl6s H. Bloom Company, Inc. September 2, 1988, 12176 Page 2 M 6. Test soil and water samples for total petroleum hydrocarbons (TPH) "gasoline", with benzene, toluene, xylene and ethylbenzene (BTXE) ; 7. Dispose of purged water; 8. Prepare this final report with project description, field observations, sampling procedures, analytical results, remediation results, conclusions and recommendations. BACKGROUND On May 3, 1988, Precision Industries removed an underground 2000 -gallon unleaded fuel storage tank at the project site. An initial round of sampling was conducted, as follows: 1) One soil sample was taken, by Precision, of the native soil from below the tank, and 2) a water sample was taken of water seeping into the bottom of the approximately eleven -foot deep pit. work plan was submitted The analytical test results found that the native soil was not contaminated by petroleum hydrocarbons but, the water sample did contain some hydrocarbon contamination. Following receipt of these results, the SJLHD originated an "Underground Storage Tank Unauthorized Release (Leak)/Contamination Site Report" which was transmitted to the CVRWQCB. Kaldveer Associates Inc., was then retained to provide consultations. On July 12, 1988, Kaldveer Associates submitted a work plan for soil and water sampling at the subject site. After discussions with San Joaquin County Health Department and Central Valley Regional Water Quality Board personnel, an addendum to the work plan was submitted on July 21, 1988. OBSERVATIONS AND SAMPLING On August 2, 1988, personnel from Kaldveer Associates were on-site during the re -excavation of the former underground tank pit. A second round of sampling was initiated. After a backhoe removed all of the loose soils, an additional one foot was excavated resulting in an excavation approximately 14 feet deep. The excavated soil was stockpiled on plastic. Our field geologist noted that the native soils were clayey silt to a depth of 111 feet, then a one -foot thick layer of clayey sand, the excavation bottomed in a stiff clay. Water was noted seeping into the open excavation from a depth of about 11 feet. Two soil samples were taken at the project site. One sample was of the native soils from the excavation side wall, at approximately 121 feet. The sample was acquired by having the backhoe dig into the side wall and then using our hand sampler to drive our sample tube into the native soil in the Kaldveer Associates