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Date; January 20,2005 ` Quarter 4a'Quarter,2004 APPENDIX A FIELD AND LABORATORY PROCEDURES Sampling Procedures Sampling equipment is thoroughly cleaned prior to the collection of 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 If the measured water level in the well is below the top of screen elevation,the well may be sampled without purging For non-purge wells, one set of water quality parameters are collected and the well is sampled with a disposable bailer Wells not containing SPH that do not qualify as non-purge wells 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 (both purge and no-purge) 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 deiontzed water solution and rinsed with • deiomzed water All water used for equipment decontarrimation is collected and contained in a truck-mounted water tank Laboratory Procedures The groundwater samples are analyzed for the presence of the following GRO (gasoline range organics C4—Cit) by using EPA Method 801513 due to capacity issues at the laboratory, BTEX, fuel oxygenates, 1,2-DCA, and EDB by 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 IWP-cessllS BP ARCQ14 M0 Quaaeriy1200414 QTR 04UO93 GWMR 4Q04 doc Page A-1