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TaberTaber ants <br /> S~Sinc_e 119544 3911 West <br /> est C Capitol Avenue <br /> West Sacramento, CA 95691 -2116 <br /> (916) 371 -1690 <br /> (707) 575-1566 <br /> Fax (916) 371 -7265 <br /> June 10 , 2009 <br /> Victoria L. McCartney <br /> San Joaquin Environmental Health Department <br /> 600 East Main Street <br /> Stockton CA 95202-3029 <br /> RE : SOIL VAPOR SURVEY WORK PLAN ADDENDUM <br /> California Tank Lines, Inc. <br /> 3105 South EI Dorado Street <br /> Stockton , California 95206 <br /> As requested , Taber Consultants (Taber) has prepared this Soil Vapor Survey Work Plan <br /> Addendum for submittal to the San Joaquin County Environmental Health Department (SJCEHD) <br /> and Central Valley Regional Water Quality Control Board (CVRWQCB) . <br /> Site Location and Description <br /> The subject site is located in the southern part of the City of Stockton , California (Figure 1 ) , on the <br /> southwest corner of the intersection between South EI Dorado Street to the east and Ivy Avenue to <br /> the north ( Figure 2) . The site is a commercial trucking facility which contains an office building , two <br /> truck maintenance shops , a truck-washing rack, a small above-ground storage tank compound , a <br /> vehicle fuelling facility, and large parking area for tank trailers . <br /> SV-5 Boring Relocation <br /> To focus the boring density to on-site locations and thus simplify project permitting , Taber <br /> proposes to relocate soil vapor probe SV-5 to west of monitoring well MW-4 and within the site's <br /> fenced perimeter from its present location (Figure 3) . Taber believes that data quality will not be <br /> compromised by relocating this boring adjacent to MW-4, while continuing to allow evaluation of <br /> any potential off-site impacts at this location . <br /> As previously described in Taber's (formerly Western Resource Management) February 26, 2009 <br /> Site Investigation Work Plan, soil vapor analytical results will be used to evaluate potential soil <br /> vapor concentrations throughout the site . Taber will collect five (5) on-site soil vapor samples in <br /> accordance with the California Regional Water Quality Control Board Los Angeles Region , Interim <br /> Guidance for Active Soil Gas Investigation dated February 25 , 1997; the California Department of <br /> Toxic Substances Control Advisory — Active Soil Gas Investigations dated January 28, 2003; and <br /> the California Department of Toxic Substances Control Interim Final Guidance for the Evaluation <br /> and Mitigation of Subsurface Vapor Intrusion to Indoor Air, dated December 14, 2004 and revised <br /> February 7, 2005 , <br /> Taber Consultants <br /> Engineers and Geologists <br />