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Site History Boyett Petroleum(419 S.Main St.,Manteca) Page I 1 of I I • On March 22 and 23, 2005, a Condor representative was on site to measure water levels and collect groundwater samples from monitoring wells MW-2, MW-3, MW4R, MW-6 through MW-11, and EW-1. ' Laboratory analytical results indicated 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-i 1, and EW-1. MTBE was not detected at or above the laboratory reported detection limit of 0.5 VtglL in the groundwater samples collected from MW- 2, MW-3, MW-6, MW-8, and MW-9. Groundwater elevations increased by 2.90 feet relative to the ' previous monitoring event (December 2004). Groundwater elevation contours based on the depth to water measurements collected on March 22, 2005, indicated a gentle gradient to the northeast. On June 30, 2005, a Condor representative was on site to measure water levels and collect groundwater samples from monitoring wells MW-2, MW-3, MW-4R, MW-6 through MW-11, and EW-1. Laboratory analytical results indicated 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-9 and MW-11 at concentrations below the California Department of Health Services Maximum Contaminant Level (MCL) of 13 gg/L. 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-4R, MW-6, MW-7, MW-8, MW-10, and EW-1. Groundwater elevations decreased by 0.34 feet relative to the previous monitoring event (March 2005). Groundwater elevation contours based on the depth to water ' measurements collected on June 30, 2005, indicated there was a small groundwater mound near the northeast corner of the site. The groundwater gradient at the site was to the south, west, and northwest, away from the groundwater mound. In the Second Quarter 2005 Groundwater Monitoring Report dated ' August 7, 2005, Condor recommended the site be considered for closure. P:3000_prj\3761 Boyett Manteca13761C Boyett Manteca Groundwater Monitoring%Reports\NFAR18oyett Manteca Site History.doc 1 1 1