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Work Plan Addendum - July 1998 ' Stockton Fire"Station#3 1116 East First Street,Stockton, California 1.0. INTRODUCTION At the request of the City of Stockton,Advanced GeoEnvironmental, Inc.(AGE)has prepared the enclosed Work Plan Addendum for the site.located at"1116 East First Street-in Stockton, California (the site).The scope of work includes the installation of one soil boring and the completion of the boring as a ground water monitoring well and the collection of a ground water sample. 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 (PI4S-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 First Street in south Stockton in an area of low topographic relief at an elevation of approximately 20 feet above sea level. The San Joaquin County Fair ground lies east of the site beyond Airport way and the Southern:Pacific Rail Road is west of the site. The site operates as a fire station. The surrounding land use in the vicinity of the site is residential and commercial. 2.2. UNDERGROUND STORAGE TANK-REMOVAL AND ASSESSMENT It is our understanding that one underground storage tank (UST), dispenser and associated piping were removed from the site: Laboratory analysis of soil samples collected beneath the UST invert. indicated a minor unauthorized release of hydrocarbons. Soil boring established at the site indicated the depth of petroleum impacted soils as great as 28-feet below surface grade.(bsg). A leaching Potential was calculated for the site by The Twining Laboratory (Twining)j-he potential for total - petroleum hydrocarbons quantified as gasoline (TPH-g)to migrate to ground water was calculated to be 15,000 parts per billion: ppb(reported or calculated as micrograms per liter).Volatile aromatic compounds(benzene, toluene, ethyl.benzene and xylenes: BTE&X)were•also detected in the soil at depth as a great as 28 feet. The leaching potential for BTE&X compounds-were also significant, with the highest possible impacted to ground water at 1,670 ppb of xylene. Advanced-GeoEnvironmental, Inc.