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Date July 24,2002 <br /> Quarter. 2"6 Quarter,2002 <br /> • <br /> APPENDIX B <br /> SAMPLING AND ANALYSIS 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 that do not <br /> 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 are 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, Iogged 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 <br /> (total) using EPA Methods 8015 (modified) and 8021, and oxygenates using EPA Method 8260B The methods of <br /> analysis for the groundwater samples are documented in the certified laboratory analytical report The certified <br /> laboratory analytical report,chain-of-custody documentation,and field data sheets are presented as Attachment C <br /> Purge and Rinsate Water Disposal <br /> Water generated during well sampling and equipment cleaning is pumped into a SECOR truck-mounted water tank <br /> The water is transported to the Blain Tech holding facility in Roseville,California, for temporary storage Water is <br /> then transported by Dillard Environmental Services to the Altamont Landfill and Disposal Facility in Altamont, <br /> California for disposal <br /> K VS SP ARC0102043%Quanff1yl2 QTR 02�GVMR doc Page B-1 <br />