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Date December 22, 2004 <br /> Quarter 40 Quarter,2004 <br /> • APPENDIX A <br /> SAMPLING AND ANALYSIS 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 (SPH), 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 are decontaminated with a steam cleaner Sensitive equipment such as <br /> 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, and ethanol using EPA Method <br /> 8260E The methods of analysis for the groundwater samples are documented in the laboratory analytical report <br /> The laboratory analytical report,chain-of-custody documentation, and field data sheets are 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 Atlantic Richfield Company's holding facility in West Sacramento,California,for temporary <br /> storage The water is then transported by Dillard Environmental to the Altamont Landfill and Resource Recovery <br /> Facility in Altamont,California for disposal <br /> K 4WPmces\B BP ARCo11 I191\Quarter1y12004\4 QTR 04/11191 GWMR 4Q64 doc Page A-1 <br />