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4.4 TANK PIT OVER EXCAVATION & SOIL DISPOSAL I4.1 Introduction In June, 1998, during the removal of six former underground storage tanks (UST's) at the site, contaminated soil was encountered mainly at the fill ends of the tanks A decision was made to over excavate the tank pit and stockpile the soil on-site until approvals were obtained for transportation and disposal In addition, a proposal was submitted to the California UST Cleanup Fund for reimbursement of costs IThe majority of the contaminated soil was removed by over excavation in the bottom of the tank pit However, it was not possible to extend the excavation to the south because of the building Confirmation sampling was not completed after over excavation, but, soil samples collected before the over excavation(at depths of 17 feet below grade)were shown to be"non detect" or to have low levels of contaminants A total of about 500 yards of contaminated soil was stockpiled behind the building along the south property line 4.2 Sampling Methods and Analytical Results ' Selected composite soil samples were obtained from the stockpile by using a slide hammer Sol] samples were taken in 2-in i d,6-in long brass tubes The tubes were sealed at each end with Teflon sheeting and PVC end caps,then labeled with sample number, date and time, and sampler's name, and stored on ice The samples were transported under chain-of-custody to a State-certified laboratory (McCampbell Analytical Lab) for analysis of TPH-Diesel (EPA Method 8015M), TPH-Gasoline, ' BTEX (EPA Method 8020), and Volatile Organic Carbons (EPA Method 8260) Table 8 presents a summary of the results of stockpile sampling The analytical results were Isubmitted for acceptance of the soil by the Altamont Landfill facility in Livermore, California 4 3 Transportation and Disposal The stockpiled soil was removed from the site on June 26, 1998 by Remedy Construction, Inc The soil was transported to the Altamont Landfill and Resource Recovery Facility, 10840 Altamont Pass Rd , Livermore, California by Lutrel Trucking A total of 725 79 tons of soil (27 truckloads) were transported to the Altamont Landfill Table 10 lists a summary of the weight receipts and staging ticket numbers The weight receipts are attached in Appendix F Soil samples FR-Comp 2-6, taken on June 5, 1998, reported 20 mg/kg of lead Further sampling, taken on June 10, indicated 22 mg/kg lead in sample FR-Comp 7/8A, 29 mg/kg lead in FR-Comp 9/10A, 24 mg/kg lead in the samples FR-Comp 11/12A and FR-Comp 13/14A, and 45 mg/kg lead in FR-Comp 15A Renredv Inc, Interim Investigation and Remediation Report September 16, 1998 Frank'c One Stop, 2072 W Yosemite Avenue Manteca, CA 01 STIR RPT 7