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California Regional Water Quality Control Board <br /> Central Valley Region <br /> Robert Schneider.Chair <br /> Alan C.Lloyd Ph.D. Arnold Sch%UMnegger <br /> Secretary for Sacramento Ma1n Offlce Governor <br /> Envlronmental InarnetAddrm hitpVAY%"Y,intpbouds,ca,govlctnualraticy I c: <br /> Prolecl ion 11020 Sun Center Drive 8200 Rancho Cordova,CA 95670-6114 . <br /> Phone(916)464-3191 FU(916)4644797 :��, MAR 17 2005 <br /> J <br /> 16 March 2005 . <br /> Mr.Thomas Bauhs Ms.Kitty Walker <br /> Chevron Environmental Management Company Stockton Department of Housing&RedeveIopment <br /> P.O.Box 6012 305 North El Dorado Street,Suite 200 <br /> San Ramon,CA 94583-0904 Stockton,CA 95202 <br /> REVIEW OF WORK PLAN,SOUTH SHORE PARCEL 2A,666 WEST WEBER <br /> AVENUE,STOCK`T'ON,SAN JOAQUIN COUNTY <br /> Staff of the Central Valley Regional Water Quality Control Board(Regional Board)reviewed the <br /> 25 February 2005 Work Plan for Soil Vapor Assessment(Work Plan)submitted by SECOR <br /> International Incorporated on behalf of the L&M Operable Unit(OU)for a portion of Parcel 2A <br /> of the South Shore Parcels along West Weber Avenue in Stockton(site). Golden State <br /> Environmental(GSE),on behalf of the City of Stockton's Department of Housing and <br /> Redevelopment(RDA)and the Human and Ecological Risk Division of the Department of Toxic <br /> Substances Control(DISC)also reviewed the Work Plan and those comments are attached. The <br /> Work flan proposes to install five vapor monitoring points to collect data to evaluate the <br /> effectiveness of the proposed soil vapor extraction (SVE)system, <br /> Regional Board staff and staff of the Site Evaluation and Remediation Unit ofDTSC have the <br /> following comments: <br /> 1. The Work Plan only proposes soil vapor monitoring points near the locations of the SVE <br /> wells under the apartment buildings. Because the proposed SVE system includes <br /> extraction wells on the undeveloped portion of the site,the Work Plan must include <br /> monitoring to assess the entire system. <br /> 2. The Work Plan includes Figures 3 and 5 to show the layout of the SVE system, <br /> However, the five proposed soil vapor monitoring points are on Figure 5,which only <br /> shows the SVE wells on the undeveloped portion of the L&M OU. The L&M OU needs <br /> to show the locations of all the SVE wells in correlation to the proposed soil vapor <br /> monitoring points and previous active soil gas sampling locations on one figure. <br /> 3. The nomenclature of the SVE wells needs to be consistent. On Figure 3,the SVE wells <br /> are labeled as"ASVE,"and on Figure 5 the SVE wells are labeled as"SVE." <br /> Furthermore,identifying the soil vapor monitoring points as"SV"is confusing based on <br /> previous active soil gas samples with the same label. The I.&M OU needs to label the <br /> Catrforrria Euvirountental Protection Agency <br /> ReOvred Paper <br />