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r� <br />Surface Water <br />First -storm surface water samples were obtained on January 10, 2005, but could not be collected <br />in the second semester due to insufficient rainfall. All concentrations of field and monitoring <br />parameters were below established concentration limits where the limits could be determined <br />with the exception of Total Organic Carbon at sample point S-4, which is down -gradient to the <br />landfill. Because the other concentrations were well within the concentration limits, we do not <br />believe this to be a release from the landfill. <br />Surface water samples were not obtained when attempted for the 2005-2006 storm season during <br />the fourth quarter. Water was present, but not flowing. <br />Unsaturated Zone <br />During the first and second semester, the lysimeters did not yield enough water for sampling, <br />indicating no detectable leaks from the liner in those areas. Unsaturated zone monitoring will <br />continue in accordance with the WDRs. <br />Unsaturated Zone Soil Pore Gas <br />The Methane concentration was zero in most wells. VOCs were reported in most samples <br />retrieved from wells and the soil gas trench this year. The number of VOCs reported per event <br />varied from 69 in the first quarter to 58 in the third quarter. The number and type of VOCs <br />reported does not indicate a trend. <br />Leachate <br />Results of leachate monitoring are consistent with past leachate monitoring events. The initial <br />samples of leachate from the Module 4 sump were collected on March 3, 2005. Five-year COCs <br />were also analyzed. Four different VOCs were reported. The highest VOC concentration <br />reported was 2-butanone. Of the dissolved metals: Manganese, Barium, and Iron concentrations <br />were the highest. <br />HISTORICAL TIME SERIES PLOTS AND STIFF DIAGRAMS <br />Historical Time Series Plots are presented in Appendix F. Note that constituents not detected are <br />plotted at a value of half their respective detection limits. Outliers were included in the plots as <br />directed by RWQCB staff. <br />Ci <br />u <br />North County RCSL 17 Public Works/Solid Waste <br />1 2nd Semester and Annual 2005 Groundwater Monitoring County of San Joaquin — January 24, 2006 <br />