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' Site History <br /> Boyett Petroleum(419 S. Main St.,Manteca) <br /> Page I 1 of 11 <br /> On March 22 and 23, 2005, a Condor representative was on site to measure water levels and collect <br /> groundwater samples from monitoring wells MW-2, MW-3, MW-4R, MW-6 through MW-11, and EW-1. <br /> Laboratory analytical results indicated that BTEX constituents, gasoline oxygenates/additives other than <br /> MTBE, and TPH-G were not detected at or above the laboratory reported detection limits in the <br /> groundwater samples collected from the monitoring wells. MTBE was detected in the groundwater <br /> samples collected from MW-4R, MW-7, MW-10, MW-11, and EW-1. MTBE was not detected at or <br /> above the laboratory reported detection limit of 0.5 µg/L in the groundwater samples collected from MW- <br /> 2, MW-3, MW-6, MW-8, and MW-9. Groundwater elevations increased by 2.90 feet relative to the <br />' previous monitoring event (December 2004). Groundwater elevation contours based on the depth to water <br /> measurements collected on March 22, 2005, indicated a gentle gradient to the northeast. <br />' P:13000_pd\3761 Boyett Manteca\3761C Boyett Manteca Groundwater Monitoring\Reports12Q051Boyett Manteca Site History.doc <br /> 1 <br /> 1 <br /> • <br /> 1 <br />