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Service Station #5469 <br /> QGM & RPR 2Q06 <br /> September 18, 2006 <br /> Page 3 <br /> MONITORING AND SAMPLING DATA <br /> During the second quarter 2006, groundwater monitoring and sampling of the site wells was <br /> performed by Stratus on May 30, 2006 All monitoring and sampling activities performed for this <br /> site during the second quarter of 2006 were overseen by Stratus and reviewed and certified by <br /> a Stratus California Professional Geologist <br /> GROUNDWATER SAMPLE ANALYSES <br /> Groundwater samples collected from each well were submitted to Sequoia for analysis of GRO, <br /> benzene, toluene, ethyl-benzene, and total xylenes (BTEX), MtBE, tertiary amyl methyl ether <br /> (TAME), di-isopropyl ether (DIPS), ethyl tert-butyl ether (EtBE), tent-butyl alcohol (TBA), ethanol, <br /> 1,2-DCA, and 1,2 Dibromoethane (EDB), by Environmental Protection Agency (EPA) Method <br /> 82608 Results of the quarterly monitoring and sampling event are discussed below <br /> GROUNDWATER SAMPLE RESULTS AND DISTRIBUTION <br /> Shallow zone <br /> During the second quarter 2006 GRO was reported in groundwater samples collected from <br /> wells MW-4, MW-8, and MW-11 MtBE was reported in groundwater samples collected from <br /> wells MW-1, MW-3 through MW-6, and MW-8 through MWA 1 1,2-DCA was reported in wells <br /> MW-12 and MW-13 TBA, EtBE, TAME, EDB, or ethanol was not reported in any of the Shallow <br /> zone wells <br /> Deep zone <br /> During the second quarter 2006, GRO, TBA, EtBE, TAME, EDB, or ethanol were not reported in <br /> any of the Deep zone wells MtBE was reported in wells MW-9 (1 2 pg/L) and MWA0 (21 pg/L) <br /> 1,2-DCA was reported to wells MW-9 (1 4 pg IL) and MW-10 (9 1 pg/L) DIPE (2 5 pg/L) and <br /> benzene (0 63 pg/L) were reported in well MW-10 <br /> REMEDIAL PERFORMANCE SUMMARY <br /> OSS stem Operation and Performance <br /> Equipment Inventory KVA C-Sparge"" Ozone Injection System <br /> Time Operational this Quarter 2,269 hours <br /> (March 21 through June 30, 2006) 94% up time <br /> Estimated Mass of Ozone Injected this 10 pounds <br /> Quarter (assumes 2 grams per hour) <br /> Time Operational since Startup 18,126 10 hours <br /> (December 26, 2002 through June 30, 59% up time <br /> 2006 <br /> Estimated Mass of Ozone Injected since 79 9 pounds <br /> Startup (assumes 2 grams per hour) <br /> • <br /> 11BP-ARCOl04 BP Valley Portfoho154691ReportslQMRs1200615469 2Q2006 doc SECOR International Incorporated <br />