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Date, October 15,2002 <br /> Quarter 3rd Quarter,2002 <br /> APPENDIX A <br /> FIELD AND LABORATORY PROCEDURES <br /> Sampling Procedures <br /> Sampling equipment is thoroughly cleaned prior to use in each well The sampling procedure for each well consists <br /> first of measuring the water level and checking for the presence of separate-phase hydrocarbons (SPH), using either <br /> an electronic indicator and a clear TeflonO bailer or an oil-water interface probe Wells not containing SPH that do <br /> not have submerged screens are then sampled without purging Wells that have submerged screens are purged of <br /> approximately three casing volumes of water (or to dryness) using a centrifugal pump, gas displacement pump, or <br /> bailer The equipment and purging method used for the current sampling event is noted on the attached field data <br /> sheets During purging, temperature, pH, and electrical conductivity are monitored in order to document that these <br /> parameters are stable prior to collecting samples After purging, water levels are allowed to partially recover <br /> Groundwater samples (both purge and no-purge) are collected using a TeflonO bailer, placed into appropriate EPA- <br /> approved containers, labeled, logged onto chain-of-custody documents, and transported on ice to a California state- <br /> certified laboratory <br /> Laboratory Procedures <br /> The groundwater samples are analyzed for the presence of TPHg, benzene, toluene,ethylbenzene, and xylenes(total) <br /> using EPA Methods 8015 (modified) and 8020, and fuel oxygenates and volatile organic compounds (VOCs) 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 appendices <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 Blain Tech holding facility in Roseville, California, for temporary storage The water is <br /> then transported by Dillard Environmental Services to Altamont Landfill and Disposal Facility in Altamont, <br /> California for disposal <br /> J W ARCOWums F&A&auon No 04493\3QMR02W93 GWMR3Q02 doc Page A-1 <br />