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San Joaquin County Public Health Services <br /> Environmental Health Division <br /> November 4, 1999 <br /> Page 3 <br /> Subsurface soils will be sampled at approximately five-foot intervals starting at five feet in depth. <br /> After the sample and core barrel is raised to the surface, each sample was collected as follows: (1) <br /> The filled acetate tube will be exposed for visual examination; (2) The selected sampling interval <br /> will be collected by cutting the sample and acetate plastic tubing to the desired length (typically <br /> about six inches); (3) The ends of the selected sample will be quickly wrapped with Teflon sheets <br /> or aluminum foil, capped with plastic end caps,labeled and wrapped tightly with tape; and(4)The <br /> sealed soil sample will be labeled and immediately placed in cold storage for transport to the <br /> analytical laboratory under formal chain-of-custody. All coring and sampling equipment will be <br /> thoroughly cleaned and decontaminated between each sample collection by triple rinsing first with <br /> water, then with dilute tri-sodium phosphate solution, and finally with distilled water. Cleaning <br /> rinseate will be contained onsite in a sealed 55-gallon drum pending laboratory results. <br /> Following completion of soil sampling activities, 3/4 inch diameter Schedule 40 PVC well casing <br /> will be placed in each boring, and grab groundwater samples will be collected from each boring <br /> using a clean small-diameter stainless steel bailer. Each grab groundwater sample will be collected <br /> as follows: (1)Four 40-m1 glass VOA vials will be completely filled directly from the bailer with <br /> a minimum of agitation; (2) After making sure that no air bubbles are present, each container will <br /> then be tightly sealed with a Teflon-lined septum; and (3) Each container will then be labeled and <br /> placed in cold storage for transport to the analytical laboratory under formal chain-of-custody. All <br /> sampling equipment will be thoroughly cleaned and decontaminated between each sample collection <br /> by triple rinsing as described above. <br /> Laboratory Analysis of Soil and Water Samples <br /> Approximately six soil samples and two grab groundwater samples will be analyzed for the <br /> following parameters: <br /> USEPA 8015M Total Petroleum Hydrocarbons as Diesel (TPH-G) <br /> USEPA 8020/602 Benzene, Toluene, Ethylbenzene, Xylenes (BTEX) <br /> USEPA 8020/602 Methyl-t-butyl Ether (MTBE) <br /> Positive MTBE detections will be confirmed using USEPA Method 8260B. All analyses will be <br /> conducted by a State-certified analytical laboratory with two-week turnaround on results. <br /> Preparation of Summary Report <br /> A report summarizing investigative methods and results will be prepared for submittal to San <br /> Joaquin County Public Health Services. This report will describe all investigative methods and <br /> results, and will include tabulated laboratory results. <br /> GR1B1 Associates <br />