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Date- May 9,2003 <br /> Quarter I" Quarter,2003 <br /> APPENDIX A <br /> FIELD AND LABORATORY PROCEDURES <br /> Sampling Procedures <br /> Sampling equipment is thoroughly cleaned prior to each sample The sampling procedure for each well includes <br /> measuring the water level and checking for the presence of separate-phase hydrocarbons (SPH), using either an <br /> electronic indicator and a clear Teflon@ bailer or an oil-water interface probe Wells not containing SPH are purged <br /> of approximately three casing volumes of water (or to dryness) using a submersible pump, centrifugal pump, gas <br /> displacement pump, or bailer The equipment and purging methods used for the current sampling event are noted on <br /> the attached field data sheets During purging,temperature, pH, and electrical conductivity are monitored in order to <br /> document that these parameters are stable prior to collecting samples After purging, water levels are allowed to <br /> partially recover Groundwater samples (both purge and no-purge) are collected using a disposable TeflonO bailer, <br /> placed into appropriate EPA-approved containers, labeled,logged onto chain-of-custody documents, and transported <br /> on ice to a California state-certified laboratory <br /> Laboratory Procedures <br /> i <br /> The groundwater samples were analyzed for the presence of TPHg, benzene, toluene, ethylbenzene, xylenes (total), <br /> and fuel oxygenates using EPA Method 8260B The methods of analysis for the groundwater samples are <br /> documented in the certified laboratory analytical report The certified laboratory analytical report,chain-of-custody <br /> 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 Roseville,California,for temporary storage <br /> The water is then transported by Dillard Environmental Services to Altamont Landfill and Disposal Facility in <br /> Altamont,California for disposal <br /> I <br /> i <br /> I <br /> i <br /> K V5 13P nRCOW43AQaanerlyv QrR 034134 GWMR 1Q03 d« Page A-1 <br />