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Taber Taber West C ants MM��/// 3911 West Capitol Avenue Since 1954 West Sacramento,CA 95691-21 1 6 (916)371-1690 (707)575-1566 Fax(916)371-7265 June 10, 2009 Victoria L. McCartney San Joaquin Environmental Health Department 600 East Main Street Stockton CA 95202-3029 RE: SOIL VAPOR SURVEY WORK PLAN ADDENDUM California Tank Lines, Inc. 3105 South El Dorado Street Stockton, California 95206 As requested, Taber Consultants (Taber) has prepared this Soil Vapor Survey Work Plan Addendum for submittal to the San Joaquin County Environmental Health Department (SJCEHD) and Central Valley Regional Water Quality Control Board (CVRWQCB). Site Location and Description The subject site is located in the southern part of the City of Stockton, California (Figure 1), on the southwest corner of the intersection between South El Dorado Street to the east and Ivy Avenue to the north (Figure 2). The site is a commercial trucking facility which contains an office building, two truck maintenance shops, a truck-washing rack, a small above-ground storage tank compound, a vehicle fuelling facility, and large parking area for tank trailers. SV-5 Boring Relocation To focus the boring density to on-site locations and thus simplify project permitting, Taber proposes to relocate soil vapor probe SV-5 to west of monitoring well MW-4 and within the site's fenced perimeter from its present location (Figure 3). Taber believes that data quality will not be compromised by relocating this boring adjacent to MW-4, while continuing to allow evaluation of any potential off-site impacts at this location. As previously described in Taber's (formerly Western Resource Management) February 26, 2009 Site Investigation Work Plan, soil vapor analytical results will be used to evaluate potential soil vapor concentrations throughout the site. Taber will collect five (5) on-site soil vapor samples in accordance with the California Regional Water Quality Control Board Los Angeles Region, Interim Guidance for Active Soil Gas Investigation dated February 25, 1997; the California Department of Toxic Substances Control Advisory—Active Soil Gas Investigations dated January 28, 2003; and the California Department of Toxic Substances Control Interim Final Guidance for the Evaluation and Mitigation of Subsurface Vapor Intrusion to Indoor Air, dated December 14, 2004 and revised February 7, 2005. Taber Consultants Engineers and Geologists