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DAMES MOORE <br /> John Lydick <br /> November 6, 1990 <br /> Page 2 <br /> Following the soil analyses, winch met the nonhazardous CCR Tale 22 criteria, the "Soil <br /> Remediation and Groundwater Monitoring Workplan" was submitted by Dames & Moore to the Regional <br /> Water Quality Control Board (RWQCB) and the San Joaquin County Heath Department in April, 1990 <br /> The workplan was implemented in June, 1990 and included landfarmmg approximately 2,135 cubic yards <br /> of soil on site The soil was spread onto a lined, bermed, treatment cell approximately 1 33 to 2 0 feet <br /> thick The soil was then fertilized, irrigated, tilled and sampled monthly for TPH/diesel as specified in <br /> the workplan <br /> Figures I through 7 depict the soil treatment cell and reflect the locations and analytical results <br /> for TPH/diesel Figures 1 and 2 reflect initial soil TPH analyses conducted within the soil treatment cell <br /> to estimate the variability throughout the cell The sample locations were chosen at random and grab <br /> samples were taken The TPH/diesel concentration in soil ranged from C 5 to 3,600 ppm, with an <br /> average of roughly 1,000 ppm <br /> Figures 3, 4 and 5 summarize a sampling program consistent with "Methods for Evaluating Solid <br /> Waste, Physical/Chemical Methods" SW-846, 2nd edition, (EPA, 1982) The EPA protocol suggests that <br /> the area (soil treatment cell) be divided into blocks (100 were designated) which are then randomly <br /> sampled Based on the SW-846 statistical formula, seven samples were needed to characterize the soil <br /> TPH concentration in the soil treatment cell When the seven random locations were selected, soil from <br /> three points within the block were mixed and the composite sample was submitted for analyses The <br /> results of these analyses showed TPH concentrations ranging from 28 to 4,600 ppm TPH, and the average <br /> value ranged from approximately 700 to 1,100 ppm TPH <br /> Figures 6 and 7 present the results of a different sampling technique used to estimate the average <br /> or composite TPH/diesel concentration throughout the treatment cell The soil treatment cell was divided <br /> into five areas, each containing 20 blocks A subsample from each of the 20 blocks was combined into <br /> a large container, mixed, and sampled The composite samples taken on 1018190, and shown on Figure <br /> SACH 008 <br /> DAMES & MOORE <br />