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Date: January 23,2003 <br /> Quarter:a6'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 Teflon®bailer or an oil-water interface probe. If the measured water level in the well <br /> is below the top of casing elevation,the well may be sampled without purging. For non-purge wells,one set of water <br /> quality parameters are collected and the well is sampled with a disposable bailer. Wells not containing SPH that do <br /> not qualify as non-purge wells are purged of approximately three casing volumes of water (or to dryness) using a <br /> submersible pump, centrifugal pump, gas displacement pump, or bailer. The equipment and purging methods used <br /> for the current sampling event are noted on the attached field data sheets. During purging, temperature, pH, <br /> electrical conductivity, and dissolved oxygen are monitored in order to document that these parameters are stable <br /> prior to collecting samples. After purging,water levels are allowed to partially recover. Groundwater samples(both <br /> purge and no-purge) are collected using a clean disposable Teflon® bailer, placed into appropriate EPA-approved <br /> containers, labeled, logged onto chain-of-custody documents, and transported on ice to a California state-certified <br /> laboratory. <br /> Decontamination Procedures <br /> Prior to sampling each well,reels and pumps are decontaminated with a steam cleaner. Sensitive equipment such as <br /> 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 the following: TPHg,BTEX, and oxygenates using EPA <br /> Method 8260. The methods of analysis for the groundwater samples are documented in the laboratory analytical <br /> report. The laboratory analytical report, chain-of-custody documentation, and field data sheets are presented as <br /> 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:V5 BP ARCOW54505QuancrbM QTR 0215450 GWMR4Q02-dac Page A-1 <br />