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Advanced <br /> GeoEnvironmental, Inc . . <br /> 23 July 2015 <br /> AGE Project No. 15-3320 <br /> Mr. Nuel Henderson <br /> San Joaquin County Environmental Health Department <br /> 1868 East Hazelton Avenue <br /> Stockton, CA 95205 <br /> Subject: Additional Site Assessment Work Plan <br /> KELLOGG PROPERTY <br /> 3808 West Lane, Stockton, California <br /> Dear Mr. Henderson: <br /> At the request of Mr. Steve Kellogg, Advanced GeoEnvironmental, Inc. (AGE) has <br /> prepared this, Additional Site Assessment Work Plan, for the subject property located at <br /> 3808 West Lane, Stockton, California (site). The scope of work includes the <br /> advancement of two soil borings for the collection of soil samples. A map showing the <br /> location of site is presented as Figure 1. A site plan showing building structures, <br /> historical soil borings and proposed soil borings is presented as Figure 2. <br /> BACKGROUND <br /> The subject property is a single parcel located on the northeast corner of the <br /> intersection of West Lane and Bourbon Street in the City of Stockton, California. AGE <br /> completed a Phase I Environmental Site Assessment (Phase 1) of the subject property <br /> on 10 February 2015. The Phase I identified the following Recognized Environmental <br /> Conditions (RECs) in connection with the subject property: the potential for a VEC <br /> (Vapor Encroachment Condition) in connection with the historical use of the subject <br /> property as a gasoline service station (Texaco), between 1967 and the late 1970s. <br /> Based on these findings AGE recommended an initial Phase II Environmental Site <br /> Assessment on the subject property. <br /> On 12 June 2015, a total of four borings (SV1 through SV4) were advanced at the site <br /> for collection of shallow and deep soil-vapor samples. A total of six soil-vapor samples <br /> were submitted for laboratory analysis. Based on laboratory analytical results, <br /> petroleum hydrocarbon constituents were detected in all six soil-vapor samples at <br /> generally low concentrations. However, petroleum hydrocarbon concentrations in soil- <br /> vapor samples increased with depth in borings SV1 and SV2 and AGE concluded that a <br /> potential hydrocarbon source may be present at deeper depths in the areas of borings <br />