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. Groundwater Flow Direction (Lower) East-southeast Groundwater Gradient(Lower) 0 036 ft/ft SVE QUARTERLY OPERATION AND PERFORMANCE Equipment Inventory Two 200 cfm King, Buck&Associates SVE Systems[SL Nos 9321 (Unit 1) & 9230 (Unit 2)] until fourth quarter 2004 New Solleco 500 cfm thermal oxidizer to replace these units during first quarter 2005 Extraction Wells VW-6, VW-8, VW-9, &MW-9 connected to Unit 1 VW-1, VW-14, MW-3, & MW-7 connected to Unit 2 Operating Mode Unit 1 shut down September 30, 2004 pending replacement Unit 2 shut down November 11, 2004 pending replacement Required Permits San Joaquin Valley Air Pollution Control District(Permit Nos N-5026-1-0& N-5026-2-0 GRO Conc End of Period [Unit 1] Not Operational GRO Conc End of Period [Unit 2] 2,200 mglm3(total influent) Benzene Conc End of Period[Unit 1] Not Operational Benzene Conc End of Period [Unit 2] 38 mg Im3 total influent MTBE Conc End of Period[Unit 1] Not Operational . MTBE Conc End of Period[Unit 2] <5 0 MQ/M3 total influent Average Flow Rate This Period [Unit 1] Not Operational Average Flow Rate This Period [Unit 2] 123 66 scfm Applied Vacuum This Period[Unit 1] Not Operational Applied Vacuum This Period [Unit 21 10 inches water column HC Destroyed This Period (lab) 636 71 lbs as GRO from both units Cumulative HC Destroyed 9,625 lbs as GRO from both units Number of Auto Shutdowns Unit 1 was non-operational during fourth quarter, Unit 2 had one strut down, and system completely shut down November 11, 2004 DISCUSSION Upper Water Bearing Zone Sand Zone 1 During the site visit conducted on December 20, 2004, approximately 4 gallons of product/water mixture were manually bailed from wells VW-1 and VW-4, and stored In a properly labeled DOT-approved drum pending disposal Approximately 18 gallons of producttwater 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 fourth quarter 2004 monitoring event, groundwater levels had decreased between 0 21 and 2 57 feet In wells MW-2, MW-13, and VW-1, and increased between 2 47 and 6 03 feet in wells VW-2 through VW-6, since the previous monitoring event (September 6, 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 contained less than 1 foot of water are interpreted to be dry and are indicated as "dry" on Figure 3 Because wells VW-1 and VW-6 are screened In a shallower interval than the other K\Bp-Arco for URS\6100\Quarterly\2004\Arco_6100_4Q04 doc 5rmiv5