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Work Plan Addendum - April 1997 Guardino and Crawford 517 West Fremont Street Stockton, California 1 .0. INTRODUCTION In accordance with the request of Mr. Dave Guardino, Advanced GeoEnvironmental, Inc. (AGE) has prepared this Work Plan Addendum for the installation of five soil probe borings 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 in 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 tank (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 hydrocarbons. 2 . 3 . PREVIOUS SITE ASSESSMENT - GEOPROBE PROBE BORINGS Three probe borings were installed at the site on 19 September 1995 (Figure 2) . The probe borings were advanced using a van-mounted Geoprobe 5400 soil probing machine equipped with 1 . 125-inch diameter rods. Probe boring PI was advanced down gradient from the former UST area, while boring P2 was advanced through the former UST excavation and boring P3 was established near the former dispenser location, each to 25 feet below surface grade (bsg). Probe boring P 1 was advanced to a r . � approved 40-m1 VOA vials.