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Date: April 21,2004 <br /> Quarter: 151 Quarter,2004 <br /> • <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, 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 <br /> such as the water Ievel 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 ORO(gasoline range organics)using EPA Method 8015B <br /> due to capacity issues at the laboratory, BTEX, fuel oxygenates, EDB, 1,2-DCA, and ethanol using EPA Method <br /> 8260B. The methods of analysis for the groundwater samples are documented in the laboratory analytical report. <br /> The laboratory analytical 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 the Blaine Tech Services holding facility in Roseville, California, or in the ARCO holding <br /> facility in West Sacramento, California, for temporary storage. Dillard Environmental Services then transports the <br /> water to the Altamont Landfill and Resource Recovery Facility in Altamont,California,for disposal. <br /> K:\Wpr essUS BP ARC01054505Quanerl)�A QTR 04\5450 GWMR 1Q04Aw Page A-1 <br />