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December 2004 Monthly Treated Water Self Monitoring Report—1707C Canepa's Car Wash,Stockton CA Page 2 presented in Table 2, below Laboratory certificates of analysis and the cham-of-custody record are included in Attachment A Table 2 —Treated Water Monitoring Laboratory Analytical Results CONSTITUENT Monitoring Event Current Sample Date 12/22/04 Lab I Field* Analytical Reporting Discharge Method Limit/Units Limit/Units Oil and Grease EPA 1664 5 mg/L 100 mg/l <5 0 mg/L Benzene EPA 8260E 0 5 pg/l 0 5 mg/l <0 5 pg/l Toluene EPA 8260B 0 5µg/l Total <0 5µg/1 Ethyl Benzene EPA 82608 0 5 pg/l Including benzene <0 5 pg/l Xylenes EPA 8260B 1 0 pg/l 4 57 mg/l <1 0 pg/l MTBE EPA 8260B 0 5 gg/l ND <0 5 pg/l DiPE EPA 8260B 0 5 pg/l ND <0 5 pg/l ETBE EPA 8260B 0 5 pg/l ND <0 5 p0 TAME EPA 8260B 0 5 pg/l ND <0 5 pg/i TBA EPA 82608 5 0 pg/l ND <5 0 pg/l Cadmium EPA 200 7 0 005 mg/l 2 0 mg/l IVT Chromium EPA 200 7 0 01 mg/l 5 0 mg/l NT Copper EPA 200 7 0 01 mg/l 6 0 mg/l NT Lead EPA 200 7 001 mg/i 2 0 mg/1 NT . Nickel EPA 200 7 0 01 mg/l 5 0 mg/1 NT Zinc EPA 200 7 0 02 mg/l 7 0 mg/l IVT Total Toxic Organics EPA 624 and 0 5-100 mg/l Total=4 57 mo NT 625 Benzene=0 5 mg/l pH(lab field*) 4500 H Std Units 5-10 7 6 NT Units AnalAcal mg/L=milligrams per liter=parts per million(ppm) B,T,E,X=benzene,toluene ethyl benzene,total xylenes pg/L=micrograms per titer=parts per billion(ppb) TPH-G=total petroleum hydrocarbons quantified as gasoline Gasoline oxygenatesladdittves= methyl tertiary-butyl ether(MTBE),tertiary- butanol (TBA),di-isopropyl ether(DIPE), ethyl tertiary butyl ether(ETRE), tertiary-amyl methyl ether(TAME) NT=not tested during this monitoring event *=Groundwater Field Measurements for pH FUTURE WORK Continue monthly self-monitoring of the site through cessation of the groundwater treatment project or as deemed necessary by the Client or MUD LIMITATIONS AND SIGNATURE This report was prepared under the direct supervision of a Professional Engineer in the State of California The standard of care for all services performed or furnished by Condor is consistent with standard practices by a member of the environmental profession practicing under similar conditions at the same time and locality when and where the work is performed Condor is not responsible for the accuracy and t ompletcness of information collected and developed by others �1� CONDOR