Laserfiche WebLink
WORK PLAN ADDENDUM FOR <br /> INVESTIGATION OF HYDROCARBON-EVIPACTED SOIL <br /> November 1995 <br /> Pacific Gas <br /> 2088 Mariposa Road <br /> Stockton, California <br /> 1.0. INTRODUCTION <br /> In accordance with the request of Mr.Manual Sanchez of Pacific Gas,Advanced GeoEnvironmental, <br /> Inc. (AGE) has prepared this Work Plan Addendum for Investigation of Hydrocarbon-Impacted Soil <br /> at 2088 Mariposa Road in Stockton, California. The scope of work includes the installation of one <br /> soil boring, two soil vapor extraction wells, performance of a soil vapor extraction pilot test and <br /> preparation of a Corrective Action Plan(CAP). <br /> The additional investigation at the site is performed in accordance with San Joaquin County Public <br /> Health Services - Environmental Health Division (PHS-EHD) guidelines for the investigation of <br /> underground storage tank (UST) sites. The Work Plan Addendum is in response to directives <br /> contained in a letter from the PHS-EHD dated 28 August 1995. The location of the site is illustrated <br /> on Figure 1. A plan of the site is illustrated on Figure 2. <br /> 2.0. BACKGROUND <br /> 2.1. SITE DESCRIPTION <br /> Located in a mixed use area of southeast Stockton(Figure 1), the site was occupied by Pacific Gas <br /> and used as a service station until 1990. A single structure is located on the northeast corner of the <br /> site(Figure 2). The site is presently occupied by an automobile smog shop. <br /> 2.2. UNDERGROUND STORAGE TANK REMOVAL <br /> Five USTs and associated piping were removed from the site in May 1990; hydrocarbons were <br /> detected in all 17 soil samples collected beneath the tanks and piping. The excavation was not <br /> backfilled after removal of the tanks. <br /> 2.3. ASSESSMENT OF HYDROCARBON-IMPACTED SOIL AND GROUND WATER <br /> In March 1993, nine soil borings(BI -139)were advanced at the site to assess the lateral and vertical <br /> extent of soil impaction. Borings drilled around the margins of the fuel tank pit (tank pit #1) and in <br /> the waste oil tank pit (tank pit#2) did not encounter any soil contamination. Low concentrations <br /> of hydrocarbons were detected in borings B7&B9, near the former pipe lines. <br />