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. Depth to Groundwater(Lower) 92 85 to 106 55 feet bgs Groundwater Flow Direction (Lower) East Groundwater Gradient(Lower) 0 031 fVft 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 Operational Required Permits San Joaquin Valley Air Pollution Control District (Permit No N-5026-3-0) Influent GRO Conc End of Period T 29,000 milligrams per cubic meter(mgliri) Influent Benzene Conc End of Period 720 Mg/M3 Influent MTBE Conc End of Period 12 mg/m3 _ Average Flow Rate This Period 317 93 cfm Average Applied Vacuum This Period 227 31"wc HC Destroyed This Period (lab) 4,338 40 lbs • Cumulative HC Destroyed 13,963 40 lbs as GRO(mass from old and new SVE systems) Number of Shutdowns 2 DISCUSSION Upper Water Bearing Zone (Sand Zone 1 During the second quarter 2005 (June 21, 2005), free product was found in well VW-1 at a thickness of 1 3 feet, and 3 gallons of product/water mixture were manually bailed Approximately 7 gallons (VW-1) and 14 gallons (VW-4) of product/water mixture have been manually balled to date Product thickness measurements and volumes of liquid bailed are summarized in Table 1 At the time of the second quarter 2005 monitoring event, groundwater levels had decreased between 0 90 and 7 57 feet in wells VW-2, VW-3, and VW-5, and increased between 0 26 and 5 96 feet in wells MW-2, MW-8, MW-13, VW-1, and VW4 since the previous monitoring event (March 14, 2005) Depth-to-water measurements were normalized to mean sea level (MSL) and used to construct a groundwater elevation contour map (Figure 3) Wells that contained less than 1 foot of water are interpreted to be dry and are Indicated as "dry" on Figure 3 The groundwater levels in wells VW-1, VW-3, and VW-5 appeared anomalous and these wells were not used in contour construction Groundwater flow was generally to the south-southeast at a gradient of 0 118 ft/ft Groundwater flow in the upper water bearing zone has been to the south, south-southeast, and toward the southwest during previous quarters GRO, benzene, and MTBE were reported In wells MW-8, VW-2, and VW-3 GRO and benzene were also reported in wells MW-13 and VW-4, and MTBE was also reported in well VW-5 The highest concentrations of GRO (110,000 µg/L) and benzene (7,900 fig/L) were reported in well VW-4, and the highest concentration of MTBE (290 j_Eg/L) was reported in well MW-8 1,2-DCA was reported in wells MW-2 (2 3 µglL), MW-8 (210 µg/L), MW-13 (0 70 µg/L), VW-3 (100 pg/L), and VW4 (970 µg/L) EDB K 113P-Arco for URS\6100\Quarterly\2005\Arco_6100_2Q05 doc Sr" U5