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1 Site History <br /> Boyett Petroleum(419 S.Main St.,Manteca) <br /> Page 7 of 7 <br /> On September 30, 2003, a Condor representative was on site to measure water levels and collect <br /> groundwater samples at monitoring wells MW-.l through MW-9. Monitoring wells MW-2, MW-4, and <br /> MW-5 were dry and monitoring wells MW-3, MW-6, MW-7, and MW-8 purged dry; as a result, <br /> groundwater samples were collected only from monitoring,wells MW-1 and MW-9. Laboratory analytical <br /> results for the groundwater samples collected at the site on September 30, 2003, indicated that BTEX <br /> constituents, gasoline oxygenates/additives, other than MTBE, and TPH-G were not detected at or above <br /> the laboratory reported detection limits in the groundwater samples collected from MW-1 and MW-9; <br /> MTBE was detected in the groundwater samples collected from both monitoring wells. The laboratory <br /> analytical results for the September 2003 monitoring event indicated the lowest historical concentration of <br /> ' MTBE detected in the groundwater sample collected from MW-1. The decrease in the concentration of <br /> MTBE detected in the groundwater sample collected from MW-i was attributed to the depth of the well's <br /> screened interval and low groundwater conditions present at the site. The average groundwater elevation <br /> decreased with respect to the last monthly monitoring event in August 2003 by 0.59 feet. An estimated <br /> groundwater gradient for the third quarter 2003 was not calculated due to the low groundwater elevations <br /> in monitoring wells MW-2, MW-6, and MW-8. <br /> 1 <br /> lie <br /> 1 <br /> ' R\3000_p j\3761 Boyett Manteca\3761B Boyelt Manteca-Groundwater Inves6gation\ReportslBoyett Manteea Site History.doc <br />