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WORK PLAN ADDENDUM <br /> MONITORING WELL INSTALLATION <br /> Grant Line Gas& Food <br /> 2420 Grant Line Road <br /> Tracy, CA <br /> October 1995 <br /> 1.0. INTRODUCTION <br /> In accordance with a request from Mr. Joe Toste, Advanced GeoEnvironemntal, Inc. (AGE) has <br /> prepared this Work Plan Addendum for the drilling and installation of one monitoring wells at 2420 <br /> Grant Line Road in Tracy, California (the site). The location of the site is illustrated in Figure 1. A <br /> plan of the site is illustrated in Figure 2. <br /> 2.0. BACKGROUND <br /> 2.1. SITE LOCATION <br /> The site is located on the southeast corner of Grant Line Road and Toste Road in a rural area west <br /> of Tracy, California(Figure I). Interstate 205 is located approximately 200 feet northwest of the site. <br /> The site is currently occupied by Grant Line Gas & Food, a gasoline service station and mini-mart <br /> establishment. <br /> 2.2. UNDERGROUND STORAGE TANK REMOVAL <br /> On May 20, 1993, soil samples were collected from beneath the former product lines at the site. <br /> Analysis of the soil samples indicated that hydrocarbon impacted soil was present in the area of the <br /> former product lines. The investigation was performed and reported by Advance Soil Technology, <br /> Inc. (AST). <br /> On June 30, 1993, three underground storage tanks (UST's) were removed from the site: two 7,500- <br /> gallon unleaded gasoline tanks and one 5,000-gallon diesel tank. The tanks were removed by Walton <br /> Engineering. <br /> Ground water was encountered in the tank excavation; ground water samples were collected from <br /> the tank excavation. Analysis of the samples indicated that hydrocarbon impacted ground water was <br /> present at the site. <br /> 2.3. INITIAL INVESTIGATION <br />