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4 WORK PLAN ADDENDUM February 1996 Shockey and Sons Trucking 850 Milgeo Avenue Ripon, California 1.0. INTRODUCTION In accordance with the request of Mr. Lee Shockey of Shockey and Sons Trucking, Advanced GeoEnvironmental, Inc. (AGE) has prepared this Work Plan Addendum for the installation of four monitoring wells and the collection of ground water samples at 850 Milgeo Avenue, in Ripon, California (the site). The location of the site is depicted in Figure 1-Location Map. A plan of the site is included in Figure 2 - Site Plan. The investigation is performed in accordance with San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) and Central Valley Regional Water Quality Control Board (CVRWQCB) guidelines for the investigation of underground storage (UST) sites. 2.0. BACKGROUND 2.1. SITE LOCATION The site is located on west side of Milgeo Avenue at the intersection Wilma Road, adjacent to Highway 99. The property is zoned industrial and is presently utilized as a distribution warehouse. Local land use in the immediate vicinity of the site is agricultural and industrial; residential areas are located south of the site. 2.2. UNDERGROUND STORAGE TANK REMOVAL It is our understanding that six USTs were removed from three separated excavations on the property in April 1994: one waste oil UST, one diesel UST and four unleaded gasoline USTs. Petroleum hydrocarbons were detected in soil samples collected from beneath the USTs at the time of removal. Soil excavated during the UST removal was used to backfill each excavation. Clean soil was imported to "cap"each excavation. 2.3. PRELRvffNARY SITE INVESTIGATION In December 1995, AGE advanced five soil probings at the site. Free hydrocarbon product was encountered in ground water samples collected from the site. However, soil samples indicated that