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SVE QUARTERLY OPERATION AND PERFORMANCE Equipment Inventory Two 200 cfm King, Buck & Associates SVE Systems ISL Nos 9321 Unit 1 &9230 unit 2 Extraction Wells VW-6, VW-8, VW-9, & MW-9 connected to Unit 1 (currently) VW-1, VW-14, MW-3, & MW-7 connected to Unit 2 (currently) Operating Mode CataIjq1C 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] 9,200 mg/m3(total influent) GRO Conc End of Period [Unit 2] 5,700 mglm3(total influent) Benzene Conc End of Period [Unit 1] 180 mg/m3(total influent) Benzene Conc End of Period [Unit 2] 130 Mg/M3 total influent MTBE Conc End of Period [Unit 1] <2 5 mq/m3 (total influent) MTBE Conc End of Period [Unit 21 <2 5 Mg/M3 total influent Average Flow Rate This Period [Unit 1] 123 91 scfm Average Flow Rate This Period [Unit 2] 157 12 scfm Applied Vacuum This Penod [Unit 1] 12 inches water column Applied Vacuum This Period [Unit 2] 11 82 inches water column HC Destroyed This Period(lab) 3,721 34 lbs as GRO(from both units) Cumulative HC Destroyed 3,800 68 lbs as GRO(from both units) Number of Auto Shutdowns 1 Unit 1 and 6 unit 2 DISCUSSION Upper Water Bearing Zone (Sand Zone 1 At the time of the second quarter 2004 monitoring event, groundwater levels had increased between 0 05 and 5 76 feet in wells MW-2 and VW-1 through VW-3, and decreased 2 78 feet in well VW-4 since the previous monitoring event (March 15, 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 Groundwater flow was to the south-southeast at a gradient of 0 213 ftlft Groundwater flow 1n the upper water bearing zone was calculated to be toward the southwest during the first quarter 2004 GRO and benzene were reported in wells MW-13, and VW-1 through VW-4 MTBE (970 pg/L) was reported in well VW-3 The highest concentrations of GRO (110,000 µg/L) and benzene (32,000 µg/L) were reported in well VW-1 1,2-DCA was reported in well VW-1 (2,000 µg/L) and VW-4 (960 µg/L) TBA, DIPE, ETBE, EDB, or ethanol were not reported 1n any of the upper zone wells Analytical results for the second quarter 2004 are generally consistent with previous quarters GRO, benzene, and MTBE analytical data for the samples collected on June 21, 2004, are presented in Figure 5 Analytical data were submitted to the State Water Resources Control Board as required by AB2886 The electronic • delivery receipt is attached in Appendix C P 113P-Arco for URS\61001Quarter1y120041Arco 6100_2Q04 doe STRAT[!S