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qeologicd Technics Inc. <br /> 1 101 7`^Street <br /> Modesto,California 95354 <br /> (209) 522-4119/Fax(209)522-4227 <br /> REPORT <br /> Groundwater Monitoring <br /> 3 d Quarter 2003 <br /> Sinclair Trucking <br /> 3780 West Linne Road <br /> ' Tracy, California <br /> Project No. 1030.2 <br /> September 29,2003 <br /> EXECUTIVE SUMMARY <br /> This report summarizes the 3`d Quarter 2003 round of groundwater monitoring and testing <br /> that took place on July 23, 2003. The laboratory analyses indicate that detectable <br /> concentrations of the aromatic hydrocarbon compounds (BTEX) and gasoline range <br /> ' petroleum hydrocarbons (TPH-G) are present in MW-1 and MW-4. The domestic well and <br /> the remaining three of the sites five monitoring wells were below laboratory detection limits <br /> for all analyzed constituents. <br /> Plots of TPH-G & Elevation versus Time: MW-1 (Chart 1) TPH-G & Elevation versus <br /> Time: MW-4 (Chart 2) indicate the concentrations of TPH-G rise with increasing <br /> groundwater elevation suggesting residual LNAPL changes to the dissolved state when in <br /> contact with groundwater. The average groundwater elevation increased approximately <br /> 2.88 feet since the April 2003 monitoring event. Site-specific gradient calculations show <br /> ' groundwater flowing N65°E with a slope of 0.0040 ft/ft. <br /> Dissolved oxygen measurements were taken for the third consecutive monitoring event. <br /> ' <br /> .-The measurements indicate that the core of the plume (MW-1) has 0.65 ppm and the deep <br /> well (MW-101) has 0.74 ppm of dissolved oxygen. The dissolved oxygen levels measured <br /> ' at the site are not favorable to biodegradation. <br />