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i —07—1.17495 1 1 = 4At r PD 1 AGE IVC 209 9E� 6 ki 700 ` ADIMADC M WORK PLAN October 1995 Grant Lime Gas and Ton€ 2420 Grandine Road Tracy,California 1.4. m TRODUCTION In avoordwroe with the requa st of Mr. Joe Torte, I d,unca GeoEnvironmental, Inc. {AGE) has prepared this work plan too perform continuing ground water rnvestig-,ation of the property located at 2420 Grardline Road m Tracy, CaliforWa(the Site). The scope of work includes the installation of one inouitoring well. The location Of the site is illustrated in Figure 1; a plan of the site is illustrated in Figure 2. 2.0. BACKGROUND 2.1. SPIT.USE OnMay 20, 1993, soil samples were collected from beneath the former product lines at the site. Analysis of the soil samples indicated that hydreraarbon impacted roil was present in the area of the former product livres. The investigation was pezfornied and reported by Advance Soil Technology, Inc. (AST). On Jum 30, 1993,three underground storage tans(UM)were removed from the site: two 7,500- gallon urdeaded gsrsoline tanks and one 5,000-gallon diesel tank. The tanks were removed by Watton Engineering. Ground water was encountered in the,tank excavation, bound water swriples were w1lect.ed from the tank excavation. Analysis of the samples indicated that hydrocarbon impacted ground water was present at the site, 2.2. MTIAL INVESTIGATION On January S, 1994, five soil bearings were.drilleA at the site by AST Tbree of the borings were aornpleted as two-inchdiameter groundwater monitoring wells_ Laboratory analysis of soil samples from thu borings indicated low aancentrations of petroleum hydrocarbons in four of the live borings. Impacted ground water was present in samples f um two of the three m.ouito ing wells. Gxound water samples have been collected twice from each well at the site. Ground water occurs at a depth of approximately 8 feet and the hydraulic gradient was calculated to be toward the north and