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i <br /> 1 <br /> A <br /> Y Quarterly Report - Second and Third Quarters 2005 <br /> Former STOCKTON PLATING Facility <br />' 632 South El Dorado Street, Stockton, California <br /> r <br />' 1.0. INTRODUCTION <br /> At the requests of Mr Richard Leland of R and L Business Management of Stockton, Advanced r <br />' GeoEnvironmental, Inc (AGE)has prepared this report for 632 South El Dorado Street, Stockton, <br /> California (the site) This report documents ongoing remediation activities conducted on the site <br /> between April and September 2005 This report documents the operation and maintenance of a <br />' 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 June and September 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 groundwater monitoring events are included in the tables of this <br /> report <br /> 2.0. PROCEDURES <br />' . All field work was performed in accordance with Central Valley Regional Water Quality Control <br /> Board(CVRWQCB)guidelines for the investigation of underground storage tank(UST)sites Soil- <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 /> 5 <br /> 21 SOIL-VAPOR EXTRACTION <br /> A stand alone soil-vapor extraction system (VES) or SVE vacuum-pump (blower) model Fuji <br />' VFC LOOP was connected to the SVE network and started operation on 30 July 2004 The SVE unit <br /> operated at a rate of 24 hours a day during the quarter,monthly sampling was conducted to measure <br /> Isoil--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 once during the quarter after exiting the SVE blower using <br /> an organic vapor meter (OVM) equipped with a photo-ionization detector PID (Thermo <br /> Environmental 5 80-10 OeV, calibrated to 1sobutylene, 100 ppb) <br /> Advanced GeoEnvironmental,Inc <br /> r , <br />