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Date- October 28,2002 <br /> Quarter 3rd Quarter,2002 <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 TeflonO 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 Welts 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 optimal purging rate is approximately I <br /> gallon per minute The equipment and purging methods used for the current sampling event are noted on the <br /> 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 (both purge and no-purge) are collected using a clean <br /> disposable Teflon@ bailer, placed into appropriate EPA-approved containers, labeled, logged onto chain-of-custody <br /> documents, and transported 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 such <br /> as the water level 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 TPHg, BTEX, and MtBE using EPA Methods 8015 <br /> (modified) and 8021 The methods of analysis for the groundwater samples are documented in the certified <br /> laboratory analytical report The laboratory analytical report, cham-of-custody documentation, and field data sheets <br /> are presented as an appendix <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 Atlantic Richfield Company's holding facility in West Sacramento, California, for temporary <br /> storage The water is then transported by Dillard Environmental to the Altamont Landfill and Resource Recovery <br /> Facility in Altamont,California for disposal <br /> i 1BP ARCMVems Fi1es\Statlon A'o 111944oWQ"11194 QMR9Q02 doc Page B-1 <br />