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2) Beacon Station #492 - 470 North Main Street: <br /> This facility is located approximately 1,000 feet north of the subject site at the <br /> southeast corner of Main and Alameda Streets. Beacon Gas currently utilizes <br /> three 10,000-gallon single-walled steel underground fuel storage tanks (UST), <br /> installed between 1964 and 1967. In January 1987, the station discovered a tank <br /> leak from its diesel UST upon tank testing and filed an Unauthorized Tank <br /> Release of petroleum with the EHS. The tank was emptied of its contents to stop <br /> the release. In May 1987 each tank was emptied, inspected and lined with <br /> fiberglass to help prevent future leaks. The tanks were then re-filled with <br /> unleaded, supreme unleaded, and regular gasoline. Laboratory Analyses detected <br /> the presence of benzene, toluene, xylene, and ethyl benzene (BTXE) in the soil <br /> and groundwater. Further assessment was ordered by the lead agency, EHS. <br /> Three groundwater monitoring wells were installed on site by RESNA between <br /> 1988-89 in addition to three vapor extraction wells. <br /> Depth to on-site groundwater was determined to be 25 feet and flowing to be the <br /> north to northeast. An additional groundwater monitoring well was installed by <br /> RESNA in July 1992 at which time closure was proposed based on non-detectable <br /> results in all four wells. However, the EHS did not concur with these findings <br /> as the fourth well had only been tested once. The June 1992 Quarterly Report <br /> identified BTXE in two monitoring wells at just above the State MCLS, and the <br /> remaining monitoring well below the State MCL. Therefore, quarterly <br /> groundwater monitoring is ongoing. The latest file entry is a proposal to install <br /> two additional vapor extraction wells inside soil borings if contamination is found. <br /> 12 <br />