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n May 2005 Monthly Treated Water Self Monitormg Report—1707C Cani,pa's Car Wash,Stockton,CA Page 2 LABORATORY ANALYTICAL RESULTS A treated water sample collected from the final discharge point was delivered under chain-of-custody to Argon Laboratories, of Ceres, California (Argon) The sample was analyzed for pH, Oil and Grease, Benzene, Toluene, Ethyl-benzene, Xylene (BTEX), Methyl-t-Butyl Ether (MTBE), Di-Isopropyl Ether (DIPE), Ethyl-t-Butyl Ether (ETRE), t-Amyl Methyl Ether (TAME), and 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 sham-of-custody record are included in Attachment A Table 2—Treated Water Monitoring Laboratory Analytical Results CONSTITUENT Monitoring.Event Current Sample Date 7/21/05 Lab Field* Analytical Reporting I Discharge Method Limit/Units Lumt/Units Oil and Grease EPA 1664 5 mg/L 100 mg/l <5 0 mg/L Benzene EPA 8260B 0 5µg/1 0 5 mg/l <0 5µg/l Toluene EPA 8260B 0 5µg11 Total <0 5µg/1 Ethyl Benzene EPA 8260B 0 5 gg/1 Including benzene <0 5µg/1 Xylenes EPA 8260B 1 0 gg/1 4 57 mg/l <1 0µg/l MTBE EPA 8260B 0 5µgll ND <0 5µg/1 DIPS EPA 8260B 0 5 gg/1 ND <0 5µg/1 ETBE EPA 8260B 0 5 ggn ND <0 5µall TAME EPA 8260B 0 5µgll ND <0 5µg/1 TBA EPA 8260B 5 0 gg/1 ND <5 0 4g/1 Cadmium EPA 200 7 0 005 mg/l 2 0 mg/l. NT Chromium EPA 200 7 0 01 mg/l 5 0 mg/l NT Copper EPA 200 7 001 mg/1 6 0 mg/1 NT Lead EPA 200 7 0 01 mg/1 2 0 mg/1 NT Nickel EPA 200 7 0 01 mg/1 5 0 mg/l NT Zinc EPA 200 7 0 02 mg/I 7 0 mall NT Total Toxic Organics EPA 624 and I 0 5-100 mg/l Total=4 57 mg/1 NT 625 Benzene=0 5 mg/1 pH(lab field*) EPA 150 1 1 Std Units 5-10 77 754 Units Analytical mg/L=milligrams per liter=parts per nnillion(ppm) B,T,E X=benzene,toluene ethyl benzene,total xylenes µg/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- b—anol (TBA),di-isuprupyi oilier kDIPE/, ethyl ieruary tiutyi ether(,TT3E) tertiary-amyl methyl ether(TAME) Notes NT=not tested during this monitoring event *=treated water 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 r 4 - W CONDOR