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. Cumulative FP Recovered to Date 218 gallons Depth to Groundwater(Upper) 28 85 to 65 43 feet below ground surface(bgs) Groundwater Flow Direction (Upper) South-southeast Groundwater Gradient(Upper) 0 103 ft/ft Depth to Groundwater(Lower) 92 81 to 106 52 feet bgs Groundwater Flow Direction (Lower) East Groundwater Gradient(Lower) 0 036 ftfft SVE QUARTERLY OPERATION AND PERFORMANCE Equipment Inventory Solleco 500 cfm thermal oxidizer procured and installed during December 2004 and January 2005 Extraction Wells VW-1, VW-3, VW-4, VW-8, VW-14, MW-2, MW-8, and MW- 9 Operating Mode Start-up tentatively scheduled for third week of April 2005 Required Permits San Joaquin Valley Air Pollution Control District Permit No N-5026-3-0 GRO Conc End of Period [Unit 1] Not Operational GRO Cone End of Period [Unit 2] Not Operational . Benzene Cone End of Period [Unit 1] Not Operational Benzene Cone End of Period [Unit 2] Not Operational MTBE Cone End of Period [Unit 11 Not Operational MTBE Cone End of Period [Unit 21 Not Operational Average Flow Rate This Period [Unit 11 Not Operational Average Flow Rate This Period [Unit 2] Not Operational Applied Vacuum This Period [Unit 11 Not Operational Applied Vacuum This Period [Unit 2] Not Operational HC Destroyed This Period (lab) Not Operational Cumulative HC Destroyed 9,625 lbs as GRO as of November 2004 Number of Auto Shutdowns Not Operational DISCUSSION Upper Water Bearing Zone Sand Zone 1 During the site visit conducted on March 14, 2005, a product sheen was found in wells VW-1 and VW-4 Approximately 18 gallons of product/water mixture has been manually bailed to date Product thickness measurements and volumes of liquid bailed are summarized in Table 1 At the time of the first quarter 2005 monitoring event, groundwater levels had decreased 0 05 feet in well MW-13, and increased between 0 19 and 17 10 feet in wells MW-2, MW-8, VW-1 through VW-6 since the previous monitoring event (December 20, 2004) Depth-to-water measurements were normalized to mean sea level (MSL) and used to construct a groundwater elevation contour map (Figure 3) Wells that K 1Sp-Arco for URS16100\Quarterly12005Wrco_6100_IQ05 doc 5TRATU5