ARCHIVED REPORTS XR0001805 - Laserfiche WebLink

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' Date March 10,2006 Quarter I"Quarter 2006 . 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 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 Ievel sounder are sprayed with a non-phosphate soap and detonized water solution and rinsed with detonized 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 GRO (gasoline range organics C4 — C12), benzene, toluene, ethylbenzene, and xylenes (total), 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 certified laboratory analytical report,chain-of-custody documentation,and field data sheets are presented as Appendix B Purge and Rinsate Water Disposal Water generated during well sampling and equipment cleaning is pumped into a truck-mounted water tank The water is transported to Blaine Tech's holding facility in Roseville, California, for temporary storage Dillard Environmental Services transports the water to the Altamont Landfill and Resource Recovery Facility in Altamont, California for disposal K NWprocessVS BY ARMOM601QuanerlyQ00611 QTR 061760 GWMR IQ06 0o Page A-1