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I Work Plan Addendum = May 1998 Guardino and Crawford 517 East Fremont Street, Stockton, California 1 .0. INTRODUCTION In accordance with the request of Ms. Pat Guardino, Advanced GeoEnvironmental, Inc. (AGE) has prepared this Work Plan Addendum for the installation of four soil borings, the completion of the borings as ground water monitoring wells and the collection of ground water samples at 517 West Fremont Street in Stockton, 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 DESCRIPTION The site is located on Fremont Street in a relatively flat area of west Stockton, south of the site is the Stockton Deep Water Channel. Local land use is the vicinity of the site is industrial and commercial. Residential areas are located adjacent to the site. 2 .2 UNDERGROUND STORAGE TANK REMOVAL It is our understanding that one underground storage tanks (UST), dispenser and associated piping were removed from the site in September 1989. Soil samples collected beneath the UST and the dispenser indicated an unauthorized release of hydrocarbon. 2.3 . PREVIOUS SITE INVESTIGATION Eight soil probe borings have been installed at the site between September 1995 and April 1997. The locations of the soil boring are depicted in Figure 2. Hydrocarbon impacted soils were limited to the vadose zone below the former dispenser location. While the dissolved hydrocarbons extend the north area ofPI ; were limited to the south by the location of P4; extend under the building to the west of P7; and high dissolved hydrocarbons were detected east of former dispenser in the area of P6.