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{ <br /> �I Ip <br /> Um <br /> .r <br /> Mr.Jeffrey Wong <br /> San Joaquin Public Health Service <br /> Fourth Quarter 2003 Groundwater Monitoring Report } <br /> I..a June 11,2004 <br /> Page 2 of 4 <br /> (Appendix A). Before and after purging each well, the submersible pump was decontaminated by steam <br /> cleaning, washing in an Alconox solution,rinsing with fresh water, and final rinsing with 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 ABCO Environmental and.manifested as non-hazardous waste based on site <br /> analytical data. <br /> Laboratory supplied sample containers and trip blanks were obtained from Severn Trent Laboratories <br /> (STL), Inc., Sacramento, California, prior to the sampling events. STL is certified by the California <br /> Department of Health Services, Environmental Laboratory Accreditation Program (DHS-ELAP). } <br /> Following purging, samples were collected from each well using disposable bailers, and transferred to <br /> the appropriate laboratory-supplied sample containers through an attachment that allows a controlled <br /> flow from the bailer. Sample containers were then labeled and placed into an iced cooler for shipment to <br /> the analytical laboratory via overnight earner. A completed chain-of-custody (copies of which are <br /> included in Appendix A) accompanied each sample shipment. <br /> LABORATORY ANALYSIS <br /> The groundwater samples were submitted for analysis according to the following methods: k <br /> Wells Analysis Method <br /> �T DMW-1 through DMW-7 Total Petroleum Hydrocarbons as Method 8015M <br /> Diesel 1(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. STL, Inc., also performed <br /> routine laboratory quality assurance/quality control (QA/QC) analyses, including method blanks, and <br /> surrogate analyses. Laboratory analytical reports for the groundwater samples and the associated QA/QC <br /> samples are included in Appendix B. <br /> Data validation was performed by URS, consisting of a review of: <br /> • data completeness; <br /> • holding times; <br /> • blanks; <br /> p KAWprocess12273614Q03AFP revOl.doc k <br />