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OZONE MICROSPARGE <br /> SYSTEM PILOT TEST STATUS REPORT <br /> For <br /> Former Unocal Service Station No. 0187 <br /> 437 East Miner Avenue <br /> Stockton,California <br /> Report No. 240042.11-3 <br /> INTRODUCTION <br /> This report presents the evaluation of ozone rnicrosparge (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-SpargeTb1 system to decrease <br /> levels of petroleum hydrocarbons in 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 Well and 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 located 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 near the site includes McLeod Lake <br /> and the Stockton Deep Water Channel, located approximately one-half mile to the west. <br /> The site operated as an Unocal service station from 1922 until 1992. The station consisted of a three-bay <br /> station building, three product dispenser islands (D-1 through D-3), and two gasoline and two waste oil <br /> USTs in a common excavation. All station facilities have been removed and the site is currently an <br /> 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 /> 240042.11-3 1 <br />