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TANK CLOSURE REPORT—BEACON #474 <br /> • 3440 East Main Street <br /> Stockton, California <br /> AMV Project No. 19012.03 <br /> stockpile were resampied as requested by Mr. Infurna. Stockpile soil sample analytical results <br /> are compiled in Table 3. Copies of certified analytical reports for the stockpiled soil samples <br /> are presented in Appendix C. The soils were removed from the site and transported to <br /> Ultramar's Hanford facility for remediation by thin-spread aeration. <br /> 6,0 SUMMARY AND DISCUSSION <br /> Approximately 1,000 cubic yards of soil were removed from the site. The tank basin area was <br /> overexcavated to a depth of 30 feet below grade. Excavation and sampling indicate that the <br /> lateral and vertical extent of hydrocarbon-impacted soils was defined. Soil samples collected at <br /> the limits of the excavations indicate that TPHg was not present at detectable concentrations. <br /> Trace amounts (less than 0.5 mg/kg) of BTEX components were reported in soil samples <br /> collected at a depth of 30 feet below grade in the excavation beneath the former underground <br /> storage tanks. The overexcavated areas have since been backfilled by Walton Engineering using <br /> clean sand backfill that was compacted in accordance with recognized engineering practices. <br /> Mr. Infurna of San Joaquin County has requested installation of three ground water monitoring <br /> wells at the site to determine the presence or absence of detectable concentrations of petroleum <br /> constituents in ground water beneath the property. AMV is currently preparing a work plan to <br /> install ground water monitoring wells for agency review. <br /> 7.0 REMARKS <br /> The opinions and conclusions contained in this report represent our professional opinions. These <br /> opinions are based on currently available information and were developed in accordance with <br /> currently accepted hydrogeologic and engineering practices at this time and location. Other than <br /> this, no warranty is implied or intended. <br /> We recommend that a copy of this report be submitted to: <br /> Mr. Mike Infurna <br /> Environmental health Division <br /> Department of Public Health Services <br /> Post Office Box 2009 <br /> 445 North San Joaquin Street <br /> Stockton, California 95201 <br /> R"0122CD <br />