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Site History <br /> Boyett Petroleum(419 S.Main St.,Manteca) <br /> Page 10 of 10 <br /> collected from the monitoring wells. MTBE was detected in the groundwater samples collected from <br /> \ MW-7, MW-10, and MW-11. The concentration of MTBE in the groundwater samples collected from <br /> MW-7, MW-10, and MW-11 decreased relative to the previous sampling event conducted on March 4, <br /> 2004. MTBE was not detected at or above the laboratory reported detection limit of 0.5 µg/L in the <br /> groundwater samples collected from MW-3, MW-4R, MW-8, MW-9, and EW-1, which indicated a <br /> decrease from the concentrations detected in the groundwater samples collected from these wells during <br /> the previous sampling event. Groundwater elevations decreased by 2.28 feet relative to the previous <br /> monitoring event (March 2004). An estimated groundwater gradient of 0.0217 ft/ft towards the south was <br /> calculated using water level data from monitoring wells MW-2, MW-6, and MW-8. <br /> P:13000_prj13761 Boyett Manteca13761C Boyett Manteca Groundwater Mon itoringlReports\3Q041Boyett Manteca Site History.doc <br />