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rt► Second Quarter 2003 Quarterly Groundwater Monitoring Report Canepa s Car Wash,Pacific Avenue,Stockton,CA Page 4 • Table 3 Groundwater Laboratory Analytical Results (April 17 and 18, 2003) Constituent Benzene Toluene Ethyl Total MTBE Gasoline MCL 1 gg/L 150 gg/L B Q zene Xylenes TPH-G 13µg/L Oxygenates/Additives Analytical Method—+ 8260B 8260B 8260B 8260E 8015M 8260E 8260B Reporting Limits-+ 0 5 gg/L 0 5 gg/L 0 5 g fL 10 gg/L 005 05 0 5-13 0 Sample 1 D mg/L gg/L µg/1, V. 1707-MW-14/18/2003 1,400 94 63 143 63 630 <5 0-130* 1707-MW-2-4117/2003 11,000 490 1,800 2,790 57 <50 <25-1,300** 1707-MW-3-4/1812003 <5 0 <5 0 <5 0 <10 0 <0 05 380 <5 0-130* 120(1,2-DCA) 1707-MW-4-4/17/2003 39 <0 5 07 <1 0 014 <0 5 <0 5-13 0 1707-MW-9-4117/2003 <0 5 <0 5 <0 5 <1 0 <0 05 <0 5 <0 5-13 0 1707-MW-11-4/17/2003 17 13 88 104 033 76 <0 5-13 0 1707-MW-12D-4/18/2003 08 <0 5 08 <1 0 0 089 <0 5 <0 5-13 0 1707-SV4-4/17/2003 97,000 93,000 5,000 23,200 390 530,000 <500-13,000 34,000(TSA) Units Analytical mg/L—milligrams per titer—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 Gasolme oxygLnates/iddilives= methyl tertiary butyl ether(MTBE),Uhanol, tertiary butanol (TBA), di-isopropyl ether (DIPE), ethyl tertiary butyl ether (ETBE), tertiary amyl methyl ether(TAME), 1,2-dichloroethane (1,2-DCA), 1,2-dibromoethane(1,2-EDB) *=tert-Butanol originally reported at raised detection limit of 50 gg/L due to high concentration of non-target analytes requiring sample dilution Selective reanalysis for tert-Butanol indicated that the compound was not detected at or above 5 0 gg/l. See laboratory results for details **= tent-Butanol and MTBE originally reported at raised detection limits of 500 and 50µglL,respectively due to high concentration of non-target analytes requiring sample dilution Selective reanalysis for tent-Butanol and MTBE indicated that the compounds were not detected at or above 2 5 and 5 0 gg/L, respectively and that the tert-Butanol result is estimated only(J-Flagged) See laboratory results for details SOIL VAPOR EXTRACTION SYSTEM The SVE system was not sampled since December 19, 2002 The system was shut down on January 31, 2003 to allow modifications to the system and property development Since that time, Condor has conducted planning and preparation for upgrading the system and installing a groundwater pump and treat system that will operate in tandem with the upgraded SVE system Condor anticipates that SVE operations will remitiate in the early summer of 2003, following approval by the SJCEHD of the remedial design Please reference the following section for additional information regarding the anticipated remediation FUTURE WORK — Condor submitted a Problem Assessment Report (PAR) and Corrective Action Plan (CAP), dated October 18, 2002, for the site The CAP recommended preparation of a Remedial Action Plan (RAP) to describe Ca CONDOR