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., Date: August 25,2004 Quarter: 3d Quarter,2004 APPENDIX A SAMPLING AND ANALYSIS PROCEDURES Sampling Procedures Sampling equipment is thoroughly cleaned prior to the collection of each sample. The sampling procedure for each well includes measuring the water level and checking for the presence of separate-phase hydrocarbons (SPH),using either an electronic indicator and a clear Teflon bailer or an oil-water interface probe.if the measured water level in the well is below the top of screen elevation,the well may be sampled without purging.For non-purge wells, one set of water quality parameters are collected and the well is sampled with a disposable bailer.Wells not containing SPH that do not qualify as non-purge wells are purged of approximately three casing volumes of water (or to dryness) using a submersible pump,centrifugal pump, gas displacement pump,or bailer.The equipment and purging methods used for the current sampling event are noted on the attached field data sheets. During purging, temperature, pH, electrical conductivity, and dissolved oxygen are monitored in order to document that these parameters are stable prior to collecting samples. After purging, water levels are allowed to partially recover. Groundwater samples (both purge and no-purge) are collected using a clean disposable TeflonO bailer, placed into appropriate EPA-approved containers, labeled, logged onto chain-of-custody documents, and transported on ice to a California state-certified Iaboratory. Decontamination Procedures Prior to sampling each well,reels and pumps will be decontaminated with a steam cleaner. Sensitive equipment such as the water level sounder are sprayed with a non-phosphate soap and deionized water solution and rinsed with deionized water. All water used for equipment decontamination is collected and contained in a truck-mounted water tank. Laboratory Procedures The groundwater samples are analyzed for the following: GRO (gasoline range organics C4 — C12), benzene, toluene, ethylbenzene, xylenes (total), fuel oxygenates, 1,2-DCA, and ethanol are analyzed using EPA Method 8260B.The methods of analysis for the groundwater samples are documented in the laboratory analytical report.The laboratory analytical report,chain-of-custody documentation,and field data sheets are presented as Appendix C. Purge and Rinsate Water Disposal Water generated during well sampling and equipment cleaning is pumped into a truck-mounted water tank. The water is transported to Blaine Tech's holding facility in Roseville, California, for temporary storage. Dillard Environmental Services transports the water to the Altamont Landfill and Resource Recovery Facility in Altamont, California for disposal. K:NWpr0cm\J5 BP ARCQW54,MQ-amr1y53 QTR 045546 GWMR 3QW.d— Page A-1