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. FP Recovered This Quarter 15 gallons <br /> Cumulative FP Recovered to Date 287 gallons <br /> Depth to Groundwater(Upper) 29 35 to 65 60 feet below ground surface (bgs) <br /> Groundwater Flow Direction (Upper) South <br /> Groundwater Gradient(Upper) 0 108 ft/ft <br /> Depth to Groundwater(Lower) 90 00 to 106 50 feet bgs <br /> Groundwater Flow Direction (Lower) Southeast <br /> Groundwater Gradient(Lower) 0 175 ft/ft <br /> SVE QUARTERLY OPERATION AND PERFORMANCE <br /> Equipment Inventory Solleco 500 cfm thermal oxidizer <br /> Extraction Wells VW-1, VW-3, VW-4, VW-8, VW-14, MW-4, MW-8, and <br /> MW-9 <br /> Operating Mode Operating <br /> Required Permits San Joaquin Valley Air Pollution Control District (Permit No <br /> N-5026-3-0 <br /> Influent GRO Conc End of Period 7,800 milligrams per cubic meter m /m3 <br /> Influent Benzene Conc End of Period 73 Mg/M3 <br /> . Influent MTBE Conc End of Period <1 0 m /m3 <br /> Average Flow Rate This Period 292 67 cfm <br /> Average Applied Vacuum This Period 100 49"wc <br /> HC Destroyed This Period (lab) 37,843 82 Ibs <br /> Cumulative HC Destroyed 77,507 47 lbs as GRO(mass from old and new SVE <br /> systems) <br /> Number of Shutdowns 3 <br /> DISCUSSION <br /> Upper Water Bearing Zone (Sand Zone 1 <br /> During the first quarter 2006, a product sheen was observed In wells VW-1, and VW-4, and approximately <br /> 2 gallons of product/water mixture were balled from each of these wells To date, a total of approximately <br /> 14 gallons (VW-1), and 20 gallons (VW-4) of producttwater mixture have been bailed Product thickness <br /> measurements and volumes of liquid bailed are summarized in Table 1 <br /> At the time of the first quarter 2006 monitoring event, groundwater levels had increased between 1 14 and <br /> 10 42 feet in wells MW-4, MW-8, MW-13, VW-1 through VW-5, and decreased by 0 03 feet in well MW-2 <br /> since the previous monitoring event (December 19, 2005) Depth-to-water measurements were <br /> normalized to mean sea level (MSL) and used to construct a groundwater elevation contour map (Figure <br /> 3) Wells that contained less than 1 foot of water are interpreted to be dry and are indicated as "dry" on <br /> Figure 3 The groundwater levels In wells VW-1 and VW-4 appeared anomalous and these wells were not <br /> used in contour construction Groundwater flow was generally to the south at an average gradient of <br /> K 1Bp-Arco For URS16I MQuarterly12006Wco_6100_1 Q06 doc 5TRA TU5 <br />