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• <br /> OZONE MICROSPARGE <br /> SYSTEM PILOT TEST STATUS REPORT <br /> at <br /> Former Unocal Service Station No 0187 <br /> 437 East Miner Avenue <br /> Stockton, California <br /> Report No 240042 11-2 <br /> INTRODUCTION <br /> This report presents the evaluation of ozone microsparge (C-SpargeTM) remedial system operated by <br /> Gettler-Ryan Inc (GR)at the above referenced site The work was performed at the request of Union Oil <br /> Company of California (Unocal) to evaluate the effectiveness of using C-SpargeTM system to decrease <br /> • levels of petroleum hydrocarbons to groundwater beneath the subject site The scope of work performed <br /> included collecting and analyzing groundwater samples from nearby monitoring wells during the <br /> system's operation, and preparing a report that documents the work performed, evaluates the systems <br /> performance, and makes recommendations regarding future use of the system as well as the need for <br /> additional subsurface assessment work This work was requested by San Joaquin County Public Health <br /> Services Environmental Health Division(SJCPHS-EHD)and the San Joaquin County District Attorney in <br /> an August 30, 2000 meeting Work performed was proposed in GR's Monitoring Welland Sparge Point <br /> Installation Report(report#240042 11-1, dated July 15, 2002) <br /> SITE DESCRIPTION <br /> The subject site is a vacant lot situated on the northwest corner of East Miner Avenue and California <br /> Street in the city of Stockton, California, as shown on the Vicinity Map (Figure 1) The site is situated in <br /> an urban area of retail shops and hotels Topography in the site vicinity is flat lying, at an elevation of <br /> approximately 15 feet above mean sea level (MSL) Surface water in the vicinity of the site includes <br /> McLeod Lake and the Stockton Deep Water Channel, situated approximately one-half mile to the west <br /> The site was an operating Unocal service station from 1922 until 1992 Most recently the station <br /> consisted of a three-bay station building, three product dispenser islands (D-1 through D-3), and two <br /> gasoline and one waste oil USTs in a common excavation All station facilities have been removed and <br /> the site is currently an unpaved vacant lot Locations of former site features are shown on Figure 2 <br /> PREVIOUS ENVIRONMENTAL WORK <br /> Two 1,000-gallon gasoline and one 550-gallon waste oil USTs were removed from the southeast corner of <br /> the subject site in 1967 Data related to soil conditions beneath the USTs at the time of removal is not <br /> available <br /> 24004211-2 1 <br />