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WORK PLAN ADDENDUM December 1995 Jordan Realty 298 West Grant Line Road Tracy, California 1.0. INTRODUCTION In accordance with the request of Mr. Bill Jordan, Advanced GeoEnvironmental, Inc. (AGE) has prepared the enclosed Work Plan for Soil and Ground Water Investigation at 298 West Grant Line Road in Tracy, California(the site). The location of the site is illustrated on Figure 1 - Location Map. A plan of the site is illustrated on Figure 2 - Site Platt. The work is performed in accordance with San Toaquin County Public Health Services - Environmental Health Division (PHS-EHD) and Central Valley Regional Water Quality Control Board guidelines for investigation of underground storage tank(UST) sites. 2.0. BACKGROUND 2.1. SITE DESCRIPTION The site is located in a commercial/industrial area of central Tracy(Figure 1). The property is located at the southeast corner of the intersection of Grant Line Road and Parker Avenue. One building, a canopy and a metal storage shed are currently situated on the property (Figure 2). 2.2_ UNDERGROUND STORAGE TANK REMOVAL The property was operated as gasoline service station from 1960 to 1980. A total of four underground storage tanks (USTs) were removed from the site in April 1988 one 1,000-gallon gasoline UST; one 6,000-gallon gasoline UST; one 8,000-gallon gasoline UST; and one 1,000-gallon waste oil UST. The USTs were removed from two separate excavations. The first excavation is located on the west side of the canopy; the second (and larger) excavation is located north of the building. Upon removal of the USTs, soil and ground water samples were collected from the excavations. Laboratory results of the soil and ground water samples indicated the presence of hydrocarbon- impacted soil and groundwater at the site. 2.3. MONITORING WELL INSTALLATION AND SAMPLING In September 1988, three ground water monitoring wells were installed by KleinfeIder, Inc.