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4 <br /> S E C ® R <br /> r 1E <br /> 1� <br /> • <br /> Groundwater has been monitored on a quarterly basis since 1990 and sampled at the site on a <br /> quarterly or semi-annual basis since April 1993 Floating product or sheen has never been observed <br /> in any of the wells Historically, petroleum hydrocarbon concentrations in the groundwater have <br /> ranged from not detected to 78,000 parts per billion (ppb) of TPHg (well VW-2), not detected to <br /> 28,000 ppb of benzene (well MW-5), and not detected to 4,900 ppb of MtBE (well VW-3) <br /> Groundwater data for the third quarter 2001 sampling event on September 12 and 13, 2001 ranged r <br /> from not detected to 34,000 parts per billion (ppb) of TPHg (well VW-7), not detected to 870 ppb ofl <br /> benzene (well VW-7), and not detected to 310 ppb of MtBE (well VW-4) Historically, depth to <br /> groundwater has risen from approximately 51 to 53 feet bgs in 1993 to 30 to 32 feet bgs in ' <br /> Y <br /> September 2001 Groundwater flow has been to the northeast with the hydraulic gradient ranging <br /> from 0 002 to 0 013 feet/feet Ato <br /> In November 2001 Gettler Ryan install ten ozone wells SP-1 through SP-10 to approximately 65 feet <br /> bgs and three ozone wells SP-11 through SP-13 were installed to approximately 40 feet bgs The <br /> well were connected to an ozone sparge system and the system was placed into operation on <br /> December 19, 2001 The system cycles ozone/air injection between ten sparge points (SP-1 <br /> through SPA 0) Since the ozone microsparge panel can only supply ten points, wells SPA 1 through <br /> SP-13 will be for future use The schedule is currently set to cycle through each point 16 times per <br /> day, for 5 to 10 minutes per point per cycle Sparge point selection and cycle times will be adjusted <br /> as petroleum hydrocarbon concentrations in groundwater change <br /> RECENT QUARTER ACTIVITIES (Third Quarter 2003) <br /> 1 Performed quarterly groundwater monitoring and sampling (GRI) <br /> 2 Prepared and submitted a quarterly summary report <br /> 3 Performed remedial system operation and maintenance <br /> a <br /> NEXT QUARTER ACTIVITIES (Fourth Quarter 2003) <br /> 1 Prepare and submit a quarterly summary report <br /> 2 Perform quarterly groundwater monitoring and sampling , <br /> 3 Perform remedial system operation and maintenance <br /> a <br /> CHARACTERIZATIONIREMEDIAL STATUS <br /> Sod contamination delineated? Yes <br /> Dissolved groundwater delineated? Yes <br /> Free product delineated? NA I <br /> Sodlgroundwater remediation in progress? Yes <br /> Start? 2001 <br /> Anticipated completion date? 2005 <br /> r <br /> r <br /> CONSULTANT SECOR International Incorporated <br /> r <br /> ,l <br /> �+e <br /> a� <br /> s <br />