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Closure Summary Report - ApriI 1997 Former SAN JO AQU IN CITY RESORT 30836 Airport Way, Tracy, California 1.0. INTRODUCTION AND SCOPE OF NVORK In accordance Nvith the request of Mr. Bill Fisk, : (hwnced GeoEnvironmental, Inc. (AGE) has prepared the enclosed Closure Summary Report (CSR) for the site located at 30836 Airport Way in Tracy. California (the site). The objective of the investigation v,-as, to determine the lateral and vertical extents of hydrocarbon-impacted soil and ground water in preparation for site closure certification. The scope of work included the advancement of six soil probe borings and the collection of soil and ground water samples. The location of the site is illustrated on Figure 1 Location .Vaj). A plan of the site is illustrated on Figure 2 - Site Plan. The CSR is prepared in accordance with San Joaquin County Public Health Services _ I'nvironmcrntal Health Division (PHS-EHD) and Central Valley Regional Water Equality Control Board guidelines for investigation of underground storage tank (LEST) sites. 2.0. BACKGROUND/PREVIOUS INVESTIGATIONS 2.1. SITE DESCRIPTION The site is located in an agricultural/rural residential area of southern San Joaquin County (Figure 1). The property is located at the southeast corner of the intersection of Airport �Vay and Kasson Road. One building is currently situated on the property and is utilized as a restaurant and market (FI(Ture 2). 2.2. UNDERGROUND STORAGE TANK REMOVAL It is our understanding that the property was operated as gasoline service station from the early 1960s to the late 1980s. 'Pyo 10,000-gallon gasoline underground storage tanks (LISTS) v ere relnoved from the site in October 1989. The LISTS were rennoved from a single excavation, located northwest of the building. Associated product delivery lines and a dispenser ishind Nvere also concurrently removed with the tanks. Total petroleum li�,drocarhoiis quanti.fzed as gasoline (TPH-g) and volatile aromatics (benzene, toluene, ethyl benzene and xylenes: BTI &X) were detected in soil samples collected from the 1JS`f excavation and product line areas at concentrations up to 1,200 and 115,000 mg/k.g (milli,>rarns per kilogram Cr parts per milho�l: ppm), respectively. Lased upon the analytical results, the PHS-EHD �. required further investigation to dclinLate the lateral and vertical extent of the hydrocarbon impacted soil. Results of the soil samples colli-cted during the UST removal are summarized on Table 1.