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Date: February 19,2003 <br /> Quarter: 4`b Quarter,2002 <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 Teflono 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, electrical conductivity, and dissolved oxygen are <br /> monitored in order to document that these parameters are stable prior to collecting samples. After purging, water <br /> levels are allowed to partially recover. Groundwater samples are collected using a clean disposable Teflon® 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 /> 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 TPHg, benzene, toluene, ethylbenzene, xylenes (total), <br /> and fuel oxygenates using EPA Method 8260B.Influent air samples are analyzed for the presence of TPHg,benzene, <br /> toluene,ethylbenzene, xylenes (total) and MTBE using EPA Methods 8015B and 8021B. The laboratory analytical <br /> 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 Blaine Tech's holding facility in Roseville, California, for temporary storage. Dillard <br /> Environmental Services transports the water to the Altamont Landfill and Resource Recovery Facility in Altamont, <br /> California for disposal. <br /> K:U5 By ARC00054R4 QTR 021548 GWMR4QM.doc Page A-1 <br />