Laserfiche WebLink
Date- February 11, 2003 <br /> Quarter 4th Quarter, 2002 <br /> APPENDIX A <br /> FIELD AND LABORATORY PROCEDURES <br /> Sampling Procedures <br /> Sampling equipment is thoroughly cleaned pnor to each sample The sampling procedure for each well includes <br /> measuring the water level and checking for the presence of separate-phase hydrocarbons (SPH), using either an <br /> electronic indicator and a clear Teflon bailer or an oil-water interface probe Wells not containing SPH that do not <br /> qualify as non-purge wells are purged of approximately three casing volumes of water (or to dryness) using a <br /> submersible pump, centrifugal pump, gas displacement pump, or bailer The equipment and purging methods used <br /> for the current sampling event are noted on the attached field data sheets Dunng 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 /> 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 presence of the following TPHg, benzene,toluene,ethylbenzene,and <br /> xylenes (total) using EPA Methods 8015B (modified) and 8021B Oxygenates are analyzed using EPA Method <br /> 8260B The methods of analysis for the groundwater samples are documented in the laboratory analytical report <br /> The laboratory 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 /> 1\SACDATAMWpm essV5 BP ARC0)bW801QuarterlylA_QTR 0MNO GWMR4Q02 doc Page A-1 <br />