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TREADWELL & ROLLO To minimize the potential for cross contamination between wells, the stainless steel bailer was thoroughly washed with laboratory detergent (Alconox) and rinsed with deionized water prior to and after sampling each well. After purging, groundwater samples from each monitor well were obtained for analytical testing using a clean disposable, polyethylene bailer. Samples were collected at the air-water interface within each well. The bailer was filled several times with groundwater from each well. The contents of the first filling were used for measuring the temperature, pH, and specific conductance of the sample. The contents of the second filling were used for volatile organic analyses and carefully collected and placed in two 40-milliliter volatile organic analysis vials so that container headspace was eliminated. The contents of the last fillings were used for the remaining analyses. The total metal samples were filtered and acidified in the lab on the same day they were obtained. All sample containers were provided by the laboratory and had been prepared in accordance with the standard procedures for each analysis. The sample bottles were placed in ice-cooled chests from the time of collection until their delivery by Treadwell & Rollo to the analytical laboratory. A chain-of-custody record was completed and accompanied the sample shipment. Copies of the chain-of- custody records are presented in Appendix B. All chemical analyses were performed by Curtis & Tompkins, Ltd., a California Department of Health Services certified analytical laboratory located in Berkeley, California. The constituents for which these samples were analyzed were determined based on the preliminary evaluation of the chemical use history at the site and in the vicinity. The samples obtained on 23 August 1991 were analyzed for some or all of the following: 6 1107A201.CRJ 5 November 1991