Laserfiche WebLink
Date: June 27,2003 <br /> ' Quarter: 2°d Quarter,2003 <br /> • APPENDIX A <br /> FIELD AND LABORATORY PROCEDURES <br /> Sampling Procedures <br /> Sampling equipment is thoroughly cleaned prior 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 are purged <br /> of approximately three casing volumes of water (or to dryness) using a submersible pump, centrifugal pump, gas <br /> displacement pump,or bailer.The equipment and purging methods used for the current sampling event are noted on <br /> the attached field data sheets. During purging, temperature, pH, electrical conductivity, and dissolved oxygen are <br /> monitored in order to document that these parameters are stable prior to collecting samples. After purging, water <br /> levels are allowed to partially recover. Groundwater samples are collected using a clean disposable Teflon®bailer, <br /> placed into appropriate EPA-approved containers,labeled,logged onto chain-of-custody documents,and transported <br /> on ice to a California state-certified Iaboratory. <br /> Decontamination Procedures <br /> Prior to sampling each well, reels, and pumps will be decontaminated with a steam cleaner. Sensitive equipment <br /> such 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 TPHg, BTEX, and fuel oxygenates using EPA Method <br /> 8260)3. 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 /> • <br /> K:VWproc \35 BP ARCM54501Q�an,r1y12 QTR 4315450 GWMR 2Q03.do Page A-1 <br />