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Date July 31,2002 <br /> Quarter; 2°d Quarter,2002 <br /> • <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 Teflon®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 Teflon® bailer,placed into appropriate EPA- <br /> approved containers, labeled, logged onto chain-of-custody documents, and transported an 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 certified <br /> analytical report The certified analytical report,chain-of-custody documentation,and field data sheets are presented <br /> as Attachment 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 the Blain Tech holding facility in Roseville,California, for temporary storage Water is then <br /> transported by Dillard Environmental Services to Altamont Landfill and Disposal Facility in Altamont,California for <br /> disposal <br /> i <br /> K V5 Bp ARC0NW9A 3XQuarWTjyU_QTR 02\GWMR doc Page A-1 <br />