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Closure Summary Report W.T. Jordan Property 298 West Grant Line Road, Tracy,California ' 1.0. INTRODUCTION AND SCOPE OF WORK In accordance with a request from Mr William Jordan,Advanced GeoEnvironmental, Inc (AGE) ' has prepared this Closure Summary Report(CSR) for the property located at 298 West Grant Line Road,Tracy, California (the site) The scope of work is to summarize assessment and remediation ' activities at the site and provide information necessary for closure consideration Furthermore, results of ground water monitoring and sampling performed on 19 March 1997 are included in this report The location of the site and its surroundings are illustrated in Figure 1 - Location Map ' Significant structures and monitoring well locations are illustrated in Figure2- - Site Plan The CSR is prepared in accordance with San Joaquin County Public Health Services - ' Environmental Health Division(PHS-EHD)and the Central Valley Regional Water Quality Control Board (CVRWQCB) guidelines for investigation of underground storage tank(UST) sites 20 BACKGROUND lip 2 1 SITE DESCRIPTION ' The site is located in a commercial./industrial area of central Tracy(Figure 1) at the southeast corner of the intersection of Grant Line Road and Parker Avenue A single building, a canopy and a metal storage shed are currently situated on the property (Figure 2) 2 2 UNDERGROUND STORAGE TANK REMOVAL ' It is our understanding that the property was operated as a gasoline service Station from 1960 to 1980 Four underground storage tanks(USTs)were removed from the site in April 1988 one 1,000- gallon gasoline UST, one 6,000-gallon gasoline UST, one 8,000-gallon gasoline UST, and one 1,000-gallon waste oil UST The USTs were removed from two separate excavations The first excavation, referred to as excavation A was located on the west side of the canopy The second (and ' larger) excavation, referred to as excavation B was located north of the building Upon removal of the USTs, soil samples were collected from the excavations Laboratory analyses of the soil samples collected during the UST removal did not indicate the presence of hydrocarbon-impacted soil at the ' site However, hydrocarbon odors were noted during the USTs removals As a result of the UST removal the PHS-EHD then required the assessment of the release of petroleum hydrocarbons at the site The analytical results of all soil samples are summarized in Table I -Analytical Results Of Soil Samples Analytical results of the soil samples collected during the UST removal were included in the Preliminary Assessment Report,dated 30 November 1988, prepared by Kleinfelder, Inc