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r ff <br /> Geatagical l"echn 'oSInc. <br /> ' 1101 7`b street <br /> Modesto,California 95354 <br /> (209)522-4119 1 Fax(209)522-4227 <br /> ' REPORT <br /> ' Groundwater Monitoring <br /> 2°d Quarter 2004 <br /> ' Sinclair Trucking <br /> 3750 West Linne Road <br /> ' Tracy, California <br /> Project No. 1030.2 <br /> ' August 27, 2004 <br /> EXECUTIVE SUMMARY <br /> This report summarizes the 2°d Quarter 2004 round of groundwater monitoring and testing <br /> ' that took place on April 19, 2004. 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. Traces of some constituents were <br /> detected in MW-4. The domestic well and the remaining four of the sites six monitoring <br /> wells were below laboratory detection limits for all analyzed constituents. <br /> ' Plots of TPH-G & Elevation versus Time: MW-1 (Chart 1) TPH-G& Elevation versus Time: <br /> MW-4 (Chart 2) indicate the concentrations of TPH-G rise with increasing groundwater <br /> t elevation suggesting residual LNAPL changes to the dissolved state when in contact with <br /> groundwater. The average groundwater elevation recorded during the April 2004 <br /> groundwater-monitoring event is 65.11 feet above mean sea level. Site-specific gradient <br /> ' calculations show groundwater flowing S85°E with a slope of 0.0058 ft/ft. <br /> 1.0 GROUNDWATER MONITORING <br /> 1.1 Hydrogeology of Site <br /> On April 19, 2004, the depth to groundwater was measured in all of the monitoring wells <br /> prior to purging. Depths to groundwater, at the site, averaged 11.36 feet below the top of <br /> casing. The average groundwater elevation for the April 2004 event was 65.11 feet above <br />