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Limited Site Investigation Irerracon <br /> Vacant Property ■Tracy, California <br /> November 13, 2020 ■Terracon Project No. NA197074 <br /> 7.0 STOCKPILE SOIL DISPOSAL <br /> Between February 25 and March 11, 2020, Ponder Environmental Services of Benicia, California <br /> coordinated the loading, transportation and disposal of 8,623.45 tons of stockpiled soil from the <br /> site to the Waste Management Facility in Livermore, California. Additionally, during the same <br /> period (February 25 and March 11, 2020), a total of 15,962.03 tons of stockpiled soil was <br /> transported to the Recology Facility in Vacaville, California for disposal.The eight 55-gallon drums <br /> of drill cuttings and two 55-gallon drums of decontamination rinse water were also transported <br /> and disposed of with the stockpile soil. The stockpile soil was transported and disposed under <br /> waste manifests. A copy of the manifests for all waste disposal is available and can be provided <br /> under a separate transmittal by the client. <br /> 8.0 FINDINGS AND CONCLUSIONS <br /> Based on the scope of services described in this report and subject to the limitations described <br /> herein, Terracon concludes the following: <br /> ■ Petroleum hydrocarbon odor and PID readings indicative of a release were identified or <br /> recorded during field sampling activities; <br /> VOCs were not detected in soil samples above the Commercial/Industrial Soil RLs and <br /> RSLs, except for 1,1,2-Trichloroethane reported in sample SB14-8 at a concentration of <br /> 26 mg/Kg from the stockpile material; <br /> OCPs were not detected above laboratory reporting concentrations in the samples <br /> analyzed; <br /> CHs were not detected in soil samples above the Commercial/Industrial Soil RLs and <br /> RSLs; <br /> TPH-GRO were detected in soil samples above the Commercial/Industrial Soil RLs and <br /> RSLs (42 mg/Kg) in samples from SB7 near the pipeline and from stockpile samples <br /> ranging from 100 mg/Kg to 2,300 mg/Kg; <br /> TPH-DRO were detected in soil samples above the Commercial/Industrial Soil RLs and <br /> RSLs (56 mg/Kg) in samples from S137 near the pipeline and from stockpile samples <br /> ranging from 130 mg/Kg to 5,000 mg/Kg; and <br /> TPH-MORD were not detected in soil samples above the Commercial/Industrial Soil RLs <br /> (21,000 mg/Kg) and RSLs. <br /> Based on the concentrations of analytes observed in the soil samples, primarily concentrations of <br /> TPH-GRO and TPH-DRO collected from soil boring SB7, the analytical data supports that there <br /> was a release from historic use of the property (2003 pipeline leak) in the immediate area of the <br /> investigation near the pipeline. <br /> Responsive ■ Resourceful ■ Reliable 7 <br />