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Date: October 21,2004 <br /> Quarter: 3`a Quarter,2004 <br /> • APPENDIX A <br /> FIELD AND LABORATORY PROCEDURES <br /> Sampling Procedures <br /> Sampling equipment is thoroughly cleaned prior to the collection of each sample. The sampling procedure for each <br /> well includes measuring the water level and checking for the presence of separate-phase hydrocarbons(SPI),using <br /> either an electronic indicator and a clear Teflon® bailer or an oil-water interface probe. Wells not containing SPH <br /> are purged of approximately three casing volumes of water (or to dryness) using a submersible pump, centrifugal <br /> pump, gas displacement pump, or bailer. The equipment and purging methods used for the current sampling event <br /> are noted on the attached field data sheets. During purging, temperature, pH, electrical conductivity, and dissolved <br /> oxygen are monitored in order to document that these parameters are stable prior to collecting samples. After <br /> purging, water levels are allowed to partially recover. Groundwater samples are collected using a clean disposable <br /> Teflon@ bailer,placed into appropriate EPA-approved containers,labeled,logged onto chain-of-custody documents, <br /> and transported on ice to a California state-certified laboratory. <br /> Decontamination Procedures <br /> Prior to sampling each well,reels,and pumps will be decontaminated with a steam cleaner.Sensitive equipment such <br /> as the water level sounder are sprayed with a non-phosphate soap and deionized water solution and rinsed with <br /> deionized water_ All water used for equipment decontamination is collected and contained in a truck-mounted water <br /> tank. <br /> • Laboratory Procedures <br /> The groundwater samples are analyzed for the presence of GRO (gasoline range organics C4 — C12) using EPA <br /> Method 8015B due to capacity issues at the laboratory, BTEX, fuel oxygenates, EDB, 1,2-DCA, and ethanol using <br /> EPA Method 8260B. The methods of analysis for the groundwater samples are documented in the laboratory <br /> analytical report. The laboratory analytical report, chain-of-custody documentation, and field data sheets are <br /> presented as Appendix B. <br /> Purge and Rinsate Water Disposal <br /> Water generated during well sampling and equipment cleaning is pumped into a truck-mounted water tank. The <br /> water is transported to the Blaine Tech Services holding facility in Roseville, California, or in the ARCO holding <br /> facility in West Sacramento, California, for temporary storage. Dillard Environmental Services then transports the <br /> water to the Altamont Landfill and Resource Recovery Facility in Altamont,California,for disposal. <br /> KAWpFomss115 BP ARCQD5450\Quarter1y\3 QTR 04\5450 GWMR 3Q04.dm Page A-1 <br />