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I <br /> I <br /> !� r <br /> Quarterly Report - First Quarter 2005 <br /> Former STOCKTON PLATING Facility <br />' 632 South El Dorado Street, Stockton, California " <br /> II <br />' 1.0. INTRODUCTION <br /> At the request of Mr Richard Leland of R and L Business Management of Stockton, Advanced <br />' GeoEnvironmental, Inc (AGE) has prepared this report for 632 South El Dorado Street, Stockton, <br /> California (the site) This report documents on-going remediation activities conducted on the site <br />' between November 2004 and March 2005 This report documents the operation and maintenance <br /> of a ground water remediation system, including influent and effluent ground water sampling, and <br /> operation of a soil-vapor extraction blower remediation system This report also documents the <br /> ground water monitoring results for January and March 2005 The site setting is illustrated on <br />' Figure 1 The location of structures and monitoring wells on-site are depicted on Figure 2 <br /> Background information, including details of previous site assessment work is presented in <br /> Appendix A Results from previous ground water monitoring events are included in the tables of this <br /> report <br /> 2.0. PROCEDURES <br />'• All field work waserformed in accordance with <br /> p Central Valley Regional Water Quality Control <br /> Board(CVRWQCB)guidelines for the investigation of underground storage tank(UST)sites Sod- <br /> vapor and ground water extractions were performed in accordance with procedures outlined in the <br /> AGE-prepared Final Remediation Plan, dated 23 April 2002 and the AGE-prepared Final <br /> Remediation Plan Addendum, dated 18 July 2003 and approved by the EHD on 29 July 2003 Field <br />' procedures for soil-vapor and ground water sampling are described below <br />' 2 1 SOIL-VAPOR EXTRACTION <br /> I <br /> A stand alone soil-vapor extraction system (VES) or SVE vacuum pump (regenerative blower) <br /> model Fuji VFC I OOP was connected to the SVE network and started operation on 30 July 2004 The <br /> SVE unit operated at a rate of 24 hours a day during the quarter, monthly sampling was conducted <br /> to measure soil-vapor concentrations <br /> The system was monitored monthly and inspected or maintained weekly during operation During <br />' each monitoring event, the flow rate of extracted soil-vapor (influent) was measured using an air <br /> flow meter (Blue White 200 cubic feet per minute cfm) Vacuum potential was measured at the <br /> 3-inch influent line using a magnehelic vacuum gauge The organic-vapor concentration in the <br /> extracted soil-vapor stream was measured after exiting the SVE blower using an organic vapor meter <br /> • (OVM) equipped with a photo-ionization detector PID (Thermo Environmental 580B, 10 OeV, <br /> calibrated to isobutylene, 100 ppb) <br /> IAdvanced GeoEnvironmental,Inc <br /> I <br />