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I September 2004 Groundwater Monitoring Report—249615 Mountain House,Tracy,CA Page 2 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 Groundwater Monitoring Laboratory Analytical Results CONSTITUENT Monitoring Event 1 2 3 Sample Date 9/30/04 10/22/04 11/22/04 Lab I Field* Lab I Field" Lab I Field* Analytical Reporting Discharge Method Limit/Units Limit/Units Total Petroleum EPA g mg/L 100 mg/l ND Not Tested ND Hydrocarbons 1664/55208 Benzene EPA 8260/624 0 20 mg/L 0 5 mg/l <2 5µg11 <05241 by ND by 8260B Toluene EPA 8260/624 0 0050 mg/L Total <2 5µg11 <0 5241 by ND by 8260E Ethyl Benzene EPA 8260/624 0 20 mg/L including <2 5µg/1 <0 5µg/1 by ND by 8260B benzene 5242 Xylenes 82608/624 10 mg/L 4 57 mg/1 <2 5µg/1 <0 5241 by ND by 8260B MTBE EPA 82 OB 624 0 5µg11 ND <5µg/1 <0524gi1 by ND by 82606 DIPE EPA 8260B 0 5µg/1 ND <5µg/1 < ligil by ND by 8260B ETBE EPA 8260B 0 5µg/l ND <5µg/1 <0 524 by ND by 8260B TAME EPA 82608 0 5 pg/l ND <5µg/1 <0 Sµg11 by ND by 82606 524 2 TBA EPA 82608 5 0 pg/l ND <50µg/1 <2µg/1 by ND by 8260B 5242 Cadmium EPA 200 7 0 005 mg/l 2 0 mg/l ND Not Tested ND Chromium EPA 200 7 0 01 mg/l 5 0 mg/1 0 02 mg/1 Not Tested ND Copper EPA 200 7 001 mg/l 6 0 mg/1 0 01 mg/1 Not Tested ND Lead EPA 200 7 0 01 mg/1 2 0 mg/l ND Not Tested ND Nickel EPA 200 7 001 mg/1 5 0 mg/l ND Not Tested ND Zinc EPA 200 7 0 02 mg/l 7 0 mg/I 0 09 mg/l Not Tested 0 07 mg/l Total=4 57mg/1 Total Toxic Organics EPA 6 and 0 5-100 mgll Benzene=0 5mg 0 74 rrNot Tested ND** 6255 n Benzene=ND Benzene=ND pH(lab field*) 4500 H Std Units 5-10 96 1 964 NT NT NT 1 7 8 Units Analytical mg/L=milligrams per liter=parts per mullion(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(DIPS), ethyl tertiary butyl ether(ETBE), tertiary-amyl methyl ether(TAME) *=Groundwater Field Measurements for pH **=EPA methods 200 7 and 625 are not required on a monthly basis but were run and are included 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 ptepated undet the direct supervision of a Ptofessional 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 LA CONDOR