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Additional Site Assessment Work Plan Former HESS DUBOIS CLEANERS 348 West Harding Way, Stockton, California 1.0. INTRODUCTION AND SCOPE OF WORK At the request of Mr. Peter Wallace,Advanced GeoEnvironmental, Inc. (AGE) has prepared this additional site assessment work plan for the former Hess Dubois Cleaners located at 348 West Harding Way in Stockton, California. The proposed scope of work includes the installation of four multi-level monitoring wells for additional definition and monitoring of the dissolved contamination from the site, and advancement of fifteen soil borings for soil-gas sampling to define the lateral extent of pollution in soil and determine if the site is a source of tetrachloroethene (PCE) and trichloroethene (TCE). The location of the site is illustrated in Figure 1 and a plan of the site is depicted in Figure 2. This Work Plan has been prepared as required by the Central Valley Regional Water Quality Control Board (CVRWQCB) by letter dated 22 January 2003, and is prepared in accordance with CVRWQCB guidelines for the subsurface investigation of underground storage tank(UST) sites. 2.0. BACKGROUND AND SITE LOCATION The site is located in a business/residential area of low topographic relief in Stockton, California. The site consists of one L-shaped building along Harding Way and a base-rock paved parking area at the rear of the building. The site is presently occupied by a dry cleaning business, a real estate office and a sign company. 2.1. UST REMOVAL Eight USTs were removed from the site by Falcon Energy Associates(FEA)in January 1991.AGE has been informed that the tanks contained stoddard solvents used in dry cleaning processes. Tanks Nos. 1 through 7 were removed from a common excavation along the southern portion of the property (tank pit No. 1). Tank No. 8 was removed from beneath the sidewalk along Van Buren Street (tank pit No. 2). Analysis of soil samples collected from tank pit No. 1 indicated an unauthorized release of petroleum hydrocarbons;petroleum hydrocarbons were not detected in the samples collected from tank pit No. 2. 2.2. SITE ASSESSMENT/INSTALLATION OF GROUNDWATER MONITORING WELLS Over a 9-year assessment period,a total of eleven ground water monitoring/extraction wells and nine soil borings have been installed at the site to assess the vertical and lateral extent of impacted soil Advanced GeoEnvironmental,Inc.