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Apr , 4 , 2000 5 : 05AM No . 1112 P . 7/17 Preliminary Endangerment Assessment Work Plan Proposed Joe Widmer Elementary School Amlary 11,2000(Revised March 24,2000) Pie-4- into laboratory supplied glass jars. The samples collected at depth(3 to 9 feet) will be collected using a stainless steel ]rand auger. The subsamples will be retained in case additional analysis is necessary based on laboratory analytical results of the composite samples. Each sample container will be labeled for sample identification and placed in a cooler chilled with ice. The stainless steel shovel, stainless steel spoons, and stainless steel hand auger will be decontaminated in the field with a solution of laboratory- grade, non-phosphate detergent and purified water and rinsed with purified water prior to use at each composite group location. Upon completion of the fieldwork, the soil samples will be delivered under chain-of-custody procedures to a state certified laboratory for analyses. The four subsamples collected from each composite sample location will be composited by the laboratory. Two laboratories will be utilized to perform some of the required analyses of the composite samples. The primary laboratory (Severn Trent Laboratories, Inc., formerly Quanterra, Inc., of Arvada, Colorado) will composite the samples, split each composited sample, and ship the split composited samples to the secondary laboratory (North Coast Laboratories, LTD. of Arcata, California) utilizing chain-of-custody procedures. Severn Trent Laboratories, Inc. will perform all analyses except the analysis for Paraquat. 3.2.2 Soil Gas Sampling Plan Eight soil gas samples will be collected for laboratory analysis of TCE vapors at the locations shown on Figure 3, Appendix A. The proposed soil gas sample locations are concentrated in the southeastern portion of the site due to its proximity and downgradient position with respect to the Sharpe Depot. The soil gas samples will be collected utilizing Geoprobe® technology according to manufacturer-specified procedures for evacuating sample tubing. Tubing will be changed between samples. The soil gas samples will be collected into pre-cleaned and pre-evacuated Summa Canisters provided by Severn Trent Laboratories, Inc. of Santa Ana. The filled canisters will be chilled and transported under chain of custody procedures to the laboratory in Santa Ana, California. 3.3 LABORATORY ANALYSES According to monthly pesticide use reports (1994, 1996, and 1997) and restricted materials permits (1994-1997) obtained from the San Joaquin County Agricultural Commissioner's Office, the following products may have been applied at the site from 1994 through August 1997: Buctri I MCPA Sevin Furdan Di-syston Methomyl Methyl Parathion Aluminum Phosphide Strychnine 2,4-D Supracide Zinc Phosphide Paraquat Based on the products listed above and criteria in the Draft Version 1.4 of Guidance for Sampling Agricultural Soils,the soil samples collected at the site will be analyzed for organochlorine pesticides by EPA Method 8081A, organophosphorus pesticides by EPA Method 8141A, chlorinated herbicides by EPA Method 8151A, arsenic, lead, and selenium by EPA Method 601013, and Paraquat by Chevron RM8-10. At the request of the DTSC, the soil samples submitted for laboratory analyses by EPA Methods 8081 A, 8141 A, 8151A, and Chevron RMS-10 will be four-to-one composite samples that will be composited by the laboratory. The laboratory method detection limits and the established Preliminary Remediation Goals(PRGs)for residential soils allow for four-to-one compositing.