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Third Quarter 2005 Groundwater Monitoring and Remediation Status Report <br /> ` { ,, Moore Petroleum Bulk Plant,5491 F Street,Banta,California <br /> Page 8 <br /> System performance totals: <br /> This Quarter Cumulative <br /> Pounds of TPHg removed: 2.0 5,269 (836 gallons) <br /> Pounds of benzene removed: 0.0 1.84 <br /> Ozone System: <br /> The ozone system consists of an oxygen concentrator, an ozone generator, a supply compressor, <br /> conveyance tubing, and individual injection points, or"sparge"points. The ozone generator. . <br /> produces ozone for chemical oxidation of organic chemicals. An oxygen concentrator increases <br /> the ozone production by three times. The dual-contained conveyance tubing provides routing of <br /> the generated ozone to the selected sparge points. The sparge points provide a micro-porous <br /> medium to produce small bubbles of ozone for mixing into the surrounding groundwater <br /> formation. <br /> System startup date: February 17, 2005 <br /> Active sparging wells: OS-1 through OS-10 <br /> CONCLUSIONS <br /> Based onoundwater analytical results concentrati n <br /> gr yt , o s remained consistent this quarter <br /> compared with historical results. Hydrocarbon concentrations classified as TPHd, TPHmo, and <br /> TPH as kerosene continue to vacillate between each other due to laboratory interpretation of the <br /> results. Wells MW-1, MW-2, MW-4A, MW-5, MW-6 and MW-12 were below laboratory <br /> detection limits for BTEX, oxygenates and lead scavengers. The domestic well sampling results <br /> for the three sampling events during the quarter were below detection limits for all analytes. <br /> Groundwater elevations increased an average 0.91 feet this quarter compared with last quarter. <br /> Groundwater isoconcentration maps for TPHg, TPHd, TPH kerosene, and benzene show the <br /> petroleum hydrocarbon plume defined downgradient, while the isoconcentration maps for <br /> TPHmo and MTBE are not defined downgradient. <br /> During the summer of 2004, the SVE system experienced non-detect results from the influent <br /> sampling performed on the SVE system. Due to the non-detect concentrations in the influent <br /> samples, as reported by the lab for July and August 2005, Apex believes that the site <br /> concentrations are in a seasonal low as experienced last year. <br /> Apex is cycling the SVE system until VOC concentrations become elevated, with continued <br /> operation of the ozone system. <br /> i <br />