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Surface Water <br /> There was no flowing water during the second semester monitoring event. <br /> ' Soil Gas - Unsaturated Zone <br /> The air in the unsaturated zone at the monitoring perimeter(Figure 5)was sampled <br /> ' October 1, 2003. Samples were collected by first measuring the methane content using a Landtec <br /> Gem 1000 portable gas detector. The Gem was operated until a steady-state gas composition <br /> indicated that the well was purged. After purging, gas samples were collected in 6-liter Summa <br /> ' canisters and sent to Atmospheric Analysis and Consulting Laboratories for analysis by EPA <br /> method TO-14A. <br /> ' VOCs were detected in all of the soil gas samples. The highest VOC concentration was found in <br /> SG-1 (Table 2). A tabular summary of test results is included in Appendix H. <br /> None of the VOCs detected in the soil gas wells were detected in the groundwater samples <br /> collected this quarter. Methylene chloride was reported in soil gas and at three of the groundwater <br /> wells,but this compound was also detected in one or more groundwater quality control blanks, <br /> and is therefore a"false positive" in the groundwater samples. Therefore the discharge to the <br /> unsaturated zone has not caused degradation of the waters of the state. <br /> Methane concentration was 13.3 percent in SG-1. Methane concentrations were 0 percent in the <br /> other wells. <br /> GROUNDWATER FLOW DIRECTION <br /> ' Groundwater levels were measured in monitoring wells MW-1, MW-2R,and MW-3 during the <br /> third and fourth quarters of the calendar year. Groundwater was determined to flow towards the <br /> southwest(Figure 3). The groundwater gradient is 0.0019 foot per foot, calculated from the <br /> ' contours drawn. <br /> STANDARD OBSERVATIONS <br /> Regular site inspections were performed during the second semester of 2003. A summary of the <br /> standard observations for the semester has been compiled(Appendix G). A signature on the form <br /> certifies that all observations were performed and are accurate. <br /> RUN-OFF/RUN-ON FACILITIES <br /> The Foothill Sanitary Landfill utilizes several methods to control run-on and run-off. The natural <br /> ' topography of the area controls any run-on into the site. Also, the working area is a significant <br /> distance from the property boundary, so run-on from surrounding properties is minimal. To <br /> Foothill Sanitary Landfill 7 Department of Public Works/Solid Waste <br /> 2ND Semester/Annual 2003 Groundwater Monitoring County of San Joaquin-Revised June 29,2004 <br />