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wi Date January 29,2004 (quarter 4`h Quarter,2003 APPENDIX A FIELD AND LABORATORY PROCEDURES Sampling Procedures Sampling equipment is thoroughly cleaned prior to each sample The sampling procedure for each well includes measuring the water level and checking for the presence of separate-phase hydrocarbons (SPH), using either an electronic indicator and a clear Teflon®bailer or an oil-water interface probe Wells not containing SPH are purged of approximately three casing volumes of water (or to dryness) using a submersible pump, centrifugal pump, gas displacement pump, or bailer The equipment and purging methods used for the current sampling event are noted on the attached field data sheets During purging, temperature, pH, electrical conductivity, and dissolved oxygen are monitored in order to document that these parameters are stable prior to collecting samples After purging, water levels are allowed to partially recover Groundwater samples are collected using a clean disposable Teflon®bailer, placed into appropriate EPA-approved containers,labeled,logged onto chain-of-custody documents,and transported on Ice to a California state-certified laboratory Decontamination Procedures Prior to sampling each well, reels, and pumps will be decontaminated with a steam cleaner Sensitive equipment such as the water level sounder are sprayed with a non-phosphate soap and deionized water solution and rinsed with deionized water All water used for equipment decontamination is collected and contained in a truck-mounted water tank Laboratory Procedures The groundwater samples are analyzed for the presence of TPHg (reported as GRO-gasoline range organics) using EPA Method 8015B due to capacity issues at the laboratory, methanol by EPA Method 801513, BTEX, fuel oxygenates, 1,2-DCA,and ethanol using EPA Method 8260B The methods of analysis for the groundwater samples are documented in the laboratory analytical report The laboratory analytical report, chain-of-custody documentation,and field data sheets are presented as Appendix B Purge and Rlnsate Water Disposal Water generated during well sampling and equipment cleaning is pumped into a truck-mounted water tank The water is transported to the Blaine Tech Services holding facility in Roseville, California, or in the ARCO holding facility in West Sacramento, California, for temporary storage Dillard Environmental Services then transports the water to the Altamont Landfill and Resource Recovery Facility in Altamont,California,for disposal • K\WPm V5 BP ARCOW213MQumterly54 QTR 43\2130 GWMR 4QO3 doe Page A-1