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January 2005 Monthly Treated Water Self Monitoring Report—1707C Canepa's Car Wash,Stockton,CA Page 2 (DIPE), Ethyl-t-Butyl Ether (ETBE), t-Amyl Methyl Ether (TAME), t-Butyl Alcohol (TBA), The treated water final discharge laboratory analytical methods results, reporting limits and discharge limits are . presented in Table 2, below Laboratory certificates of analysis and the chain-of-custody record are included in Attachment A Table 2 —Treated Water Monitoring Laboratory Analytical Results CONSTITUENT Monitoring Event Current Sample Date i/2Y/04 Lab I Field* Analytical Reporting Discharge Method LimiuUmts Limit/Units Oil and Grease EPA 1664 5 mg/L 100 mg/l <5 0 mg/L Benzene EPA 82608 0 5 pg/l 0 5 mg/l <0 5µg/1 Toluene EPA 8260B 0 5µg/1 Total <0 5µg/l Ethyl Benzene EPA 8260B 0 5µg/1 Including benzene <0 5 lig/l. Xylenes EPA 8260B 1 0µg/1 4 57 mg/I <1 0µg/1 MTBE EPA 8260B 0 5µg/1 ND <0 5µg/1 DIPE EPA 8260B 0 5µg/1 ND <0 5µg11 ETBE EPA 8260E 0 5µg/1 ND <0 5µgll TAME EPA 8260B 0 5 pg/l ND <0 5 lie TBA EPA 8260B 5 0µg/1 ND <5 0µg/1 Cadmium EPA 200 7 0 005 mgn 2 0 mg/I NT Chromium EPA 200 7 0 01 mg/l 5 0 mg/1 NT . Copper EPA 200 7 001 mg/l 6 0 mg/l NT Lead EPA 200 7 0 01 mg/l 2 0 mg/1 NT Nickel EPA 200 7 003 mg/l 5 0 mg/l NT Zinc EPA 200 7 0 02 mg/1 7 0 mg/l NT Total Toxic Organics EPA 624 and 0 5-100 mg/I Total=4 57 rngA NT 625 Benzene=0 5 mg/1 pH(lab field*) 4500 H Std Units 5-10 7 8 7 7i 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),tertiary- butanol (TBA), di-isopropyl ether(DIPE),ethyl tertiary butyl ether(ETBE), 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 completeness of information collected and developed by others �a CONDOR