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f r <br /> h � <br /> —as.-.. -n s✓ rl..H^ -,. t ..,--ss^. .--a=,u^. „rpt J'ry r_ -^c�.r .». ..s^s e'n..^^ --,.hr^s <br /> • Remediation Report - Second,and Third Quarter 2004 <br /> Former STOCKTON PLATING Facility <br />' z 632 South El Dorado Stireet,,Stockton, California ^ <br /> r <br />' 10' INTRODUCTION x <br /> At the request of,Mr Richard Leland of R and L Business Management of Stockton, Advanced= : L <br />' GeoEnvironmental, Inc (AGE) has prepared this report for 632 South El Dorado Street, Stockton,' <br /> California (the site)' This report documents soil and ground water extraction activities conducted ! <br /> between April and August 2004,including replacement ofthe catalytic oxidation remediation system r <br />' with a stand alone soil-vapor extraction blower The site setting is illustrated on Figure 1 The, , <br /> locations of structures and monitoring wells on the site are depicted on Figure 2 <br /> 1 Background information, including details of previous site assessment work is presented in 1� <br /> - - Appendix A Results from previous ground water monitoring events are included in the tables of this <br />' report <br />' 2.0. PROCEDURES Y <br /> All field work was performed in'accordance with Central Valley Regional Water Quality Control <br /> I 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 <br /> Field procedures for soil-vapor and ground water sampling are described below <br /> 21 SOIL VAPOR EXTRACTION ' <br /> A Solleco-manufactured EnvioPure 250 catalytic-oxidizer soil-vapor extraction system (VES) has <br /> + been in operation since December 2003 The system was monitored monthly and inspected or <br /> maintained weekly during operation During each monitoring event, the flow rate of extracted soil-, <br /> vapor(influent)was measured using an electrical DPT flow meter Vacuum potential was measured <br /> at the 2 5-inch influent line using a magnehelic vacuum gauge The organic-vapor concentration in <br /> 1 the extracted soil-vapor stream was measured before entering the blower(influent stream)and after <br /> exiting the catalytic unit (effluent stream) using an organic vapor meter (OVM) equipped with a <br /> ` photo-ionization detector PID (Thermo Environmental 580B, 10 OeV, calibrated to isobutylene, <br /> Iw 100 ppb) <br /> A total of six sets of soil-vapor samples were collected dunng the two quarter of operation (second <br /> If <br /> and third quarters 2004) Influent and effluent soil vapor samples were collected from the catalytic <br /> oxidizer on 27 April,JS May, 22 June and',22 July, in Tedlar vapor bags using a vacuum pump <br /> n <br /> � Advanced GeoEnviro n mental,Inc <br /> I 1 , <br /> , <br /> Wt , <br /> 1 , <br />