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Preliminary Endangerment Assessment Page 6 Former Haley's Flying Service GPE Project 474.2 cleaned between uses. The sample material was transferred from the bailer to laboratory- supplied 1-liter amber glass bottles provided by the laboratory. Each sample container was then labeled and immediately transferred to a cooler chilled with water ice for transport to the laboratory under chain-of-custody. After collecting the final sample, each boring was filled to grade with Class G neat cement under the supervision of a San Joaquin County Department of Environmental Health inspector, Mr. Harlin Knoll. The on-site domestic water well was sampled from a tap located at the loading dock. The valve was opened and the water was allowed to flow for several minutes so that the piping and well tubing would be purged, and fresh formation water allowed to enter, and be collected. The sample was collected directly into a 1-liter sample container, which then was treated in the same manner as the other samples. Upon retrieval, each groundwater sample was transported to Argon Laboratories of Ceres, CA for analytical testing. Argon forwarded the samples to McCampbell Labs, and this laboratory performed the following analysis: 0 Organo-chlorine pesticides by EPA method 8081B The specific chemicals and their reporting limits are listed in the Summary Table 1 and in the laboratory data sheets in Appendix A. 3.2 Waste Disposal About 15 to 20 gallons of decon water from washing sample equipment was containerized in an appropriate DOT container. The water contains 1.4 ppb of Endosulfan Il and 0.75 ppb of Endosulfan sulphate. The water will be allowed to evaporate. No waste soil cuttings were generated during the Power-ProbeTM drilling process. 3.3 Documentation A general field log was maintained during the fieldwork, and soil boring logs were maintained of each boring. Notes were made of the date and time of the work, the personnel on site, the general weather, and the sequence and time of significant field events. Photographs supplemented the log information. Photocopies of the field notes are attached as Appendix D. Site photos are attached as Appendix C, and boring logs are attached as Appendix B. 3.4 Summary of Groundwater Analytical Results As shown in Summary Table 1, and the text table below, organo-chlorine pesticides were detected in three of the six groundwater samples collected from the soil borings. Three of the soil boring samples and the domestic water well sample did not contain detectable organo- chlorine pesticides. The principal contaminants are Toxaphene and the chemicals of the Endosulfan sub-group. One sample also contained a trace of Endrin. 2937 Veneman Avenue,Suite B240 Geo-Phase Environmental Inc. Phone: (209)569-0293 Modesto,Ca 95356 Fax: (209)569-0295