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1 <br /> CedlogicaI rechaia W. <br /> 1101 7"Street <br /> Modesto,California 95354 <br /> (209)522-4119/Fax (209)5224227 <br /> ' REPORT <br /> ' Groundwater Monitoring <br /> 2°d Quarter 2003 <br /> Sinclair Trucking <br /> ' 3780 West Linne Road <br /> Tracy, California <br /> Project No. 1030.2 <br /> May 15, 2003 <br /> 4D <br /> EXECUTIVE SUMMARY <br /> tThis report summarizes the 2 Quarter 2003 round of groundwater monitoring and testing <br /> that took place on April 18, 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 /> Dissolved oxygen measurements were taken for the second consecutive monitoring event. <br /> The measurements indicate that the core of the plume (MW-1) has 1.93 ppm and the <br /> margins (MW-2 and MW-4) have an average of approximately 0.66 ppm. The deep well <br /> (MW-101) has 0.61 ppm of dissolved oxygen. <br /> The average groundwater elevation increased approximately 4 <br /> g g 0 1 feet since the January <br /> 2003 monitoring event. Site-specific gradient calculations show groundwater flowing in a <br /> northeasterly direction with.a slope of 0.0030 ft/ft.- <br /> 1 <br />