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fl <br /> togica 7-Cchiics Inc. <br /> 1101 7u'street <br /> Modesto,California 95354 <br /> ' (209)522-4119 1 Fax(209)522-4227 <br /> REPORT <br /> Groundwater Monitoring <br /> 18t Quarter 2005 <br /> ' Sinclair Trucking <br /> 3780 West Linne Road <br /> Tracy, California <br /> Project No. 1030.2 <br /> ' March 18, 2005 <br /> EXECUTIVE SUMMARY <br /> This report summarizes the 1St Quarter 2005 round of groundwater monitoring and testing <br /> ' that took place on January 17, 2005. The laboratory analyses indicate that detectable <br /> concentrations of the aromatic hydrocarbon compounds (BTEX) and/or gasoline range <br /> petroleum hydrocarbons (TPH-G) are present in MW-1. The domestic well and the <br /> ' remaining monitoring wells were below laboratory detection limits for all analyzed <br /> constituents. <br /> Plots of TPH-G & Elevation versus Time: MW-1 (Chart 1) and TPH-G & Elevation versus <br /> Time: MW-4 (Chart 2) indicate the concentrations of TPH-G rise with increasing <br /> ' groundwater elevation. Further suggesting that the residual LNAPL changes to the dissolved <br /> state when in contact with groundwater. The average groundwater elevation recorded during <br /> the January 2005 groundwater-monitoring event is 64.78 feet above mean sea level (AMSL). <br /> Site-specific gradient calculations show groundwater flowing N47°E with a slope of 0.0033 <br /> ft/ft. <br /> 1.0 HYDROGEOLOGIC SYSTEM <br /> ' 1.1 Regional Structure <br /> Sinclair Trucking (ST) is located in the southeast quarter of the northwest quarter of Section <br /> 7, T3S, R6E, related to the Mount Diablo B&M, on the United States Geological Survey <br />