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Date October 21,2005 - <br /> Quarter 3rd Quarter,2005 <br /> APPENDIX B <br /> FIELD AND LABORATORY PROCEDURES <br /> Sampling Procedures <br /> Sampling equipment is thoroughly cleaned prior to the collection of each sample The sampling procedure for each <br /> well includes measuring the water level and checking for the presence of separate-phase hydrocarbons (SPH), using <br /> either an electronic indicator and a clear TeflonO bailer or an oil-water interface probe Wells not containing SPH <br /> are purged of approximately three casing volumes of water (or to dryness) using a submersible pump, centrifugal <br /> pump, gas displacement pump, or bailer The equipment and purging methods used for the current sampling event <br /> are noted on the attached field data sheets During purging, temperature, pH, electrical conductivity, and dissolved <br /> oxygen are monitored in order to document that these parameters are stable prior to collecting samples After <br /> purging, water levels are allowed to partially recover Groundwater samples are collected using a clean disposable <br /> TeflonO bailer,placed into appropriate EPA-approved containers, labeled,logged onto chain-of-custody documents, <br /> 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 following GRO (gasoline range organics C4 — C12), BTEX, fuel <br /> oxygenates, 1,2-DCA, and EDB by using EPA Method 8260B, and Methanol is analyzed by using EPA Method <br /> 8015B The methods of analysis for the groundwater samples are documented in the laboratory analytical report The <br /> laboratory analytical report,chain-of-custody documentation,and field data sheets are presented as Appendix C <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%WPmcc.J5 BP ARC0%02186%Quwierly12005L3 QTR 55%2186 GWMR 3Q05 doe Page B-1 <br />