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I . 0 INTRODUCTION <br /> This submittal presents Aqua Science Engineers, Inc. (ASE)'s system <br /> installation and 1st month's operation report of a "pilot-study" ozone- <br /> sparging remediation system at the Unocal Service Station located at 574 <br /> West Grant Line Road in Tracy, California (Figures I and 2). This report <br /> has been prepared on behalf of Mr. Satnam Singh, owner of the property, <br /> as required by the San Joaquin County Public Health Services, <br /> Environmental Health Division (PHS-EHD). <br /> 2 . 0 BRIEF SITE HISTORY AND BACKGROUND INFORMATION <br /> A workplan, dated March 26, 2002, was prepared by ASE as a supplement <br /> to ASE's corrective action plan (CAP) dated January 16, 2002. ASE's <br /> rationale for the selection of ozone sparging as the preferred remediation <br /> strategy was detailed in the CAP. <br /> 3 . 0 PURPOSE OF PILOT STUDY <br /> The purpose of this pilot study is to determine the effectiveness of ozone <br /> sparging as a remediation alternative at the site. The most significant <br /> groundwater contamination is in the western portion of the site in the <br /> vicinity of monitoring well MW-2 and the former underground storage <br /> tanks (USTs). Groundwater contamination is also present in the northern <br /> portion of the site in the vicinity of monitoring well MW-5. Groundwater <br /> contamination in this area, however, has been decreasing and this area is <br /> not receiving treatment during this pilot study. If the ozone sparging is <br /> proven effective during this study and hydrocarbon contamination in the <br /> northern portion of the site needs active remediation at the conclusion of <br /> this pilot study, then ozone sparging could be expanded to this area as <br /> needed. <br /> 4 . 0 OZONE SPARGING DESCRIPTION <br /> Ozone sparging is the process of adding an ozone/air mixture into a <br /> water-bearing zone contaminated with organic compounds. The ozone <br /> acts as an oxidant, which will destroy organic hydrocarbons. Ozone c a n <br /> oxidize contaminants either directly or through the formation of hydroxyl <br /> radicals. In-situ decomposition of ozone can also lead to beneficial <br /> oxygenation and biostimulation. In addition, since a gas is injected, it may <br /> be possible for some remediation to also take place in the vadose zone as <br /> well. <br /> Singh's Unocal System Installation and Operation Report — October 2002 <br /> -1- <br />