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Canepa s Car Wash 6230 Pacific Avenue,Stockton,CA Second Quarter Groundwater Monitoring Report,April 2005 Page 5 of 10 Table 3 Groundwater Sample Laboratory Analytical Results (April 13, 2005) Constituent Benzene Toluene Ethyl Total TPH-G MTBE Other Gasoline Benzene Xylenes Oxygenates/Additives MCL 1 µg/L 150}tg/L 700 pg/L 1,750µg/L 13 pg/L Analytical Method—). 8260B 8260E 8260B 8260B 8015m 8260B 8260B Reporting Limits—)� 0 5 gg/L 0 5 pg/L 0 5 lig/L. 1 0 pg/L 005 05 05-20 Sample I D mg/I. µg/L pg/1- 1707-Influent-4/13/05 4,600 2,700 190 1,800 NT 6,000 < 100-< 1000 1707-M W2-4113/05 11,000 2,000 2,400 4,700 39 <1 0 < 1 0 -<40 1707-MW3-4/13/05 <1 0 <1 0 <1 0 <3 0 0 70* 2,900 40(1,2-DCA) 1707-MW4-4/13/05 <0 5 <0 5 <0 5 <1 5 <0 05 <0 5 <0 5 -<20 1707-MW9-4/13/05 <0 5 <0 5 <0 5 <1 5 <0 05 <0 5 <0 5 -<20 1707-MW 11-4/13/05 22 3 8 0 8 46 031 17 <0 5 -<20 1707-MW 12D-4/13/05 <0 5 <0 5 <05 <1 5 <0 05 <0 5 <0 5 -<20 1707-SVE4-4/13/05 77,000 58,000 3,900 18,800 280 320,000 <500-<20,000 Bold analytical data exceed California MCL(Maximum Contaminant level) *=The sample chromatogram does not match the standard gasoline chromatogram NT=Not tested Units Analytical mg/L=milligrams per liter=parts per million(ppm) B,T,E,X=benzene,toluene,ethyl benzene,total xylenes pg/L=micrograms per liter=parts per billion(ppb) TPH-G=total petroleum hydrocarbons quantified as gasoline Gasoline oxygenates/additives= methyl tertiary-butyl ether(MTBE),ethanol, tertiary-butanol (TBA), di-isopropyl ether (DIPS), ethyl tertiary butyl ether (ETBE), tertiary-amyl methyl ether(TAME), 1,2-dichloroethane (1,2-DCA), 1,2-dibromoethane(1,2-EDB) TREATMENT SYSTEM STATUS UPDATE Installation of the pump and treat system and upgraded SVE system was completed in September 2004 The groundwater pump and treat and upgraded SVE system was constructed such that petroleum hydrocarbons that are removed from the liquid phase treatment strearn are fed as a vapor phase into the catalytic oxidizer as part of the total vapor phase influent Groundwater from MW-i and/or MW-11 is pumped into the SVE Iiquid/vapor separator Accumulated liquid is pumped to the air-stripper storage tank and through a heat-exchanger that is integrated into the SVE effluent stack prior to entering the air- stripper The air-stripper removes BTEX and MTBE constituents with a removal efficiency of approximately 99% Previous operational analysis had shown that the air stripper MTBE destructive efficiency could be as low as 32% Liquid phase effluent from the air-stripper is pumped through two tanks, plumbed in series and loaded with 1000# of coconut-derived virgin activated carbon The carbon tanks are intended to adsorb residual MTBE, TBA, and other oxygenates Treated water is discharged to the sanitary sewer Vapor phase influent is drawn from the 9-well array through the Iiquid/vapor separator, and then into the catalytic oxidizer The catalytic oxidizer is operationally controlled to maintain temperature at 600-700 degrees F with a vapor flow rate of 100-300 SCFM The destructive efficiency of the catalytic oxidizer ranges from 94% to 99% Operational and efficiency data are included in Attachment D Laboratory certificates of analyses and chain-of-custody records are included in Attachment F -- �i �� CONDOR