Laserfiche WebLink
Date- October 15,2004 <br /> Quarter' 3`d Quarter,2004 <br /> APPENDIX A <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 Teflon° bailer or an oil-water interface probe Wells not containing SPH <br /> that do not qualify as non-purge wells are purged of approximately three casing volumes of water (or to dryness) <br /> using a submersible pump, centrifugal pump,gas displacement pump,or bailer The equipment and purging methods <br /> used for the current sampling event are noted on the attached field data sheets During purging, temperature, pH, <br /> electrical conductivity, and dissolved oxygen are monitored in order to document that these parameters are stable <br /> prior to collecting samples After purging, water levels are allowed to partially recover Groundwater samples are <br /> collected using a clean disposable Teflon°bailer, placed into appropriate EPA-approved containers, labeled, logged <br /> onto chain-of-custody 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 /> detonized 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 the following GAO (gasoline range organics C4 —C12) <br /> using EPA Method 8015B due to capacity issues at the laboratory,benzene, toluene,ethylbenzene, and total xylenes <br /> (BTEX), fuel oxygenates, I,2-dichloroethane (1,2-DCA), and ethanol are analyzed using EPA Method 8260B The <br /> methods of analysis for the groundwater samples are documented in the laboratory analytical report The laboratory <br /> analytical report,chain-of-custody documentation,and field data sheets are presented as Appendix B <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 1WPmu &A1513P ARC0W6080lQuaner1y12004Z QTR 0416060 GWMR 3Q04 d-c Page A-1 ' <br /> 11 <br />