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`1 S E C ® R <br /> fey <br /> c <br /> • Based on the available data supplied by the California Department of Water Resources (DWR), <br /> three municipal wells were identified within the '/z-mile radius of the study area, the closest well is <br /> located approximately 1,000 feet north-northwest of the site The depths of all three municipal <br /> wells were reported to exceed 550 feet bgs and contain screened intervals beginning at a <br /> minimum of 350 feet bgs The SRS was conducted within a 500-foot radius centered around the <br /> subject site The SRS involved distributing questionnaires to all residences and businesses <br /> within the study area, requesting information about potential groundwater receptors GR <br /> distributed 141 questionnaires via the U S Post Office and a total of 49 questionnaires (35%) <br /> were returned to GR None of the returned questionnaires identified the presence of a well within <br /> 41 <br /> the SRS study area (GR, 2001) <br /> MONITORING AND SAMPLING <br /> The site has been monitored and sampled since 2nd quarter, 1990 Between 1990 and 1991 the <br /> site was monitored/sampled semi-annually From 1992 to the present the Site has been y <br /> monitored/sampled quarterly Currently MW-1 and MW-3 through MW-13 are monitored and <br /> sampled quarterly each year Samples are analyzed for TPHg, BTEX, and fuel oxygenates <br /> REMEDATION STATUS <br /> The ozone injection system consists of a panel mounted KVA C-SpargeTm System that produces <br /> 4 grams per hour (0 009 pounds per hour) of ozone The system injects ozone to ten ozone wells <br /> SP-A through SP-H, SP-J, and SP-K The system was placed into operation on December 20, <br /> 2001 During the third and fourth quarter of 2003 the system operated at 82% runtime During the <br /> current quarter the system operated at 22% runtime The system was down during most of the <br /> first quarter due to a failed compressor The compressor was replaced and the system restarted <br /> . on March 10, 2004 �r <br /> CHARACTERIZATION STATUS 1 <br /> Contamination in soil has been adequately delineated Contamination in groundwater is defined f <br /> in the downgradient direction (well MW-13) <br /> RECENT SUBMITTALSICORRESPONDENCE ° <br /> May 4, 2004—First Quarter 2004 Remedial Summary Report <br /> Y <br /> THIS QUARTER ACTIVITIES (First Quarter 2004) <br /> 1 Performed quarterly groundwater monitoring and sampling (TRC) <br /> As <br /> 2 Prepared and submitted a quarterly summary report <br /> 3 Performed ozone sparge system operation and maintenance <br /> NEXT QUARTER ACTIVITIES (Second Quarter 2004) <br /> 1 Prepare and submit a quarterly summary report <br /> 2 Perform quarterly groundwater monitoring and sampling <br /> 3 Perform ozone sparge system operation and maintenance <br /> y <br /> h <br /> ;�i <br />