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First Quarter 2005 Groundwater Momtoting Report Boyett Petroleum,419 S.Main,Manteca,CA Page 3 • Table 2: Labor tory Anal tical Results (March 22 and 23, 2005) Other B T E X TPH-G MTBE Oxygenates/ Additives Detection 0.5 0.5 0.5 1.0 0.05 0.5 0.5-5,0 Limits: ltg/L pg/L pg/L µg/L mg/L pg/L pg/L Analytical Method: 8260E 8260B 8260B 8260B 8015M 8260B 8260B Sample I.D. Well I.D. 3761-MW2-3/23/05 MW-2 <0.5 <0.5 <0.5 <1.0 <0.05 <0.5 <0.5-5.0 3761-MW3-3123/05 MW-3 <0.5 <0.5 <0.5 <L0 <0.05 <0.5 <0.5-5.0 3761-MW4R-3/23105 MW-4R <0.5 <0.5 <0.5 <L0 <0.05 3.0 <0.5-5.0 3761-MW6-3123/05 MW-6 <0.5 <0.5 <0.5 I <1.0 <0.05 <0.5 <0.5-5.0 3761-MW7-3/22/05 MW-7 <0.5 <0.5 <0.5 1 <1.0 <0.05 420 <0.5-5.0 3761-MWS-3/22/05 MW-8 <0,5 <0.5 <0.5 <1.0 <0.05 <0.5 <0.5-5.0 3761-MW9-3/23105 MW-9 <0.5 <0.5 <0.5 <1 A <0.05 <0.5 <0.5-5.0 3761-MW10-3/23/05 MW-10 <0.5 <0.5 <0.5 <1.0 <0.05 110 <0.5-5.0 3761-MW 11-3123/05 MW-1 1 <0.5 <0.5 <0.5 <1.0 <0.05 1 28 <0.5-5.0 3761-EW1-3/22/05 EW-1 <0.5 1 <0.5 <0.5 1 <L0 <0.05 150 <0.5-5.0 • Unit Conversions: Analytical pg/L:parts per billion(ppb). BTEX=benzene,toluene,ethyl benzene,and total xylenes. rng/L:parts per million(ppm). TPH-G=total petroleum hydrocarbons,quantified as gasoline. MTBE=methyl tertiary-butyl ether. Other oxygenates/additives=ethanol(EtOH),tertiary-butanol(TBA),di-isopropyl ether(DIPS), ethyl tertiary-butyl ether(ETRE), tertiary-amyl methyl ether(TAME), 1,2-dichloroethane (1,2- DCA),and 1,2-dibromoethauc(EDB). Laboratory analytical results indicate that BTEX constituents, gasoline oxygenates/additives other than MTBE, and TPH-G were not detected at or above the laboratory reported detection limits in the groundwater samples collected from the monitoring wells. MTBE was detected in the groundwater samples collected from MW-4R, MW-7, MW-10, MW-11, and EW-1. MTBE was not detected at or above the laboratory reported detection limit of 0.5 µg/L in the groundwater samples collected from MW- 2, MW-3, MW-6, MW-8, and MW-9. DISCUSSION AND RECOMMENDATIONS From November 18 through 21, 2003, Condor conducted a 72-hour constant rate pump test at monitoring well MW-11 to evaluate the potential for using groundwater pump and treat methods for interim remediation of groundwater impacted by MTBE at the Site. In the Additional Groundwater Investigation, Monitor Well Destruction and Installation, and Interim Remediation Pump Test Report, dated January 30, 2004, Condor recommended the installation and operation of a groundwater pump and treat system using MW-11 as a groundwater extraction well for interim remediation of contaminated groundwater at the Site. Regulatory agencies have not approved the use of groundwater pump and 'treat for interim remediation at the Site as of the date of this report. • '1 �J CONDOR