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FIELD METHODS <br /> Static water levels were measured prior to initiating sampling activities using an electric water level <br /> sounder ( fable 2), Prior to sampling, the wells were purged to ensure representativeness of the water <br /> samples. A 2-inch-diameter Grundfos submersible pump was used for purging. Prirge rates ranged fi'otn 2 <br /> to 5.5 gpin. Field parameters (temperature, electrical conductivity, pH and turbidity) were monitored <br /> during purging, which was continued until the field parameters stabilized and a minimum of three casing <br /> volumes of groundwater had been removed. Purging data were entered on Field Record of Water <br /> Sampling FornLs (Appendix A). Before and after purging each well the submersible prune was <br /> decontaminated by steam cleaning, washing in an Alconox solution, rinsing with fresh water, and final <br /> rinsing w ith distilled water. <br /> Purge and rinsate water were placed into a Baker tank located at the site. The wastewater was removed <br /> and disposed of by ARCO Enviromnental and manifested as non-hazardous waste based on site analytical <br /> data. <br /> l.ahoratory-supplied sample containers and trip blanks were obtained from Kiff Analytical, LLC, (Kiff) of <br /> Davis, California, prior to the sampling events. Kiff is certified by the California Department of Health <br /> Services. Environmental Laboratory Accreditation Program (DHS-ELAP). Following purging, samples <br /> were collected from each well using disposable bailers, and transferred to the appropriate laboratory-- <br /> supplied sample containers through an attachment that allows a controlled flow from the bailer. Sample <br /> containers were then labeled and placed into an iced cooler for shipment to the analytical laboratory via <br /> overnight carrier. A completed chain--oC-custody (copies of which arc included in Appendix A) <br /> accompanied each sample shipment. <br /> LABORATORY ANALYSIS <br /> The groundwater samples were submitted for analysis according to the following methods: <br /> j Wells Analysis Method <br /> DMW-1 through DMW-9 Total Petroleum Hydrocarbons as Method 8015M (Silica Gel) <br /> Diesel (TPH-D) <br /> Chlorinated volatile organic EPA Method 8260B <br /> Compounds (VOCs) and <br /> oxygenates <br /> A field duplicate was collected at DMW-7. A trip blank included with the sample shipment was analyzed <br /> for chlorinated volatile organic compounds (VOCs) by EPA Method 8260B. Kiff also performed routine <br /> laboratory quality assurance/quality control (QkQC) analyses, including method blanks.. and surrogate <br /> analyse_ Laboratory analytical reports for the groundwater samples and the associated QA/QC samples <br /> arc included in Appendix B. <br /> URS Corporation <br /> 2870 Gateway Oaks Drive,Suite 300 <br /> Sacramento,CA 95833 <br /> TeL 916.6792200 <br /> Fax 916.679 2900 <br />