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Third Quarter Groundwater Monitoring Report September 2003 <br /> Boyett Petroleum,419 S.Main,Manteca,CA <br /> Page 4 <br /> . in the concentration of MTBE detected in the groundwater sample collected from MW-9 relative to the <br /> previous sampling event conducted in July 2003. <br /> The laboratory analytical results for the August 19, 2003, groundwater monitoring event are presented in <br /> Table 2, below. A map representing MTBE isoconcentration contours in shallow groundwater is included <br /> as Figure 6, attached. <br /> TABLE 2: Laboratory Analytical Results for MTBE and Groundwater Elevation Data <br /> (August 19, 2003) <br /> Monitor Sample I.D. MTBE(µgli) TOC Elevations Depth to Groundwater <br /> Well Groundwater Elevation <br /> MW-1 3761-MW1-8-19-03 2,800 36.16 22.79 13.37 <br /> MW-2 3761-MW2-8-19-03 110 35.97 22.89 13.08 <br /> MW-3 3761-MW3-8-19-03 <0.5 36.18 21.68 14.50 <br /> MW-4 NS NS 35.38 DRY NM <br /> MW-5 NS NS 35.93 DRY NM <br /> MW-6 3761-MW6-8-19-03 <0.5 36.07 23.24 12.83 <br /> MW-7 3761-MW7-8-19-03 3,700 36.42 22.12 14.30 <br /> MW-$ 3761-MW8-8-19-03 <0.5 36.43 22.49 13.94 <br /> MW-9 3761-MW9-8-19-03 3.7 35.95 23.15 12.80 <br /> • 1TOC Elevation:Elevations are referenced to NAD83 datum,NGS Benchmark HS 4486. <br /> rGroundwater Elevation:Elevations are measured from the top of the well casings and are referenced to the benchmark indicated above. <br /> All measurements are in feet. <br /> NM=Not Measured Unit Conversions: Analytical <br /> NST Not Sampled µg/L:parts per billion(ppb) MTBE=methyl tertiary-butyl ether <br /> s , <br /> �� CONDOR <br />