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Surface water samples were last analyzed for COCs during the fourth quarter 2004 monitoring <br /> event. The next monitoring event for surface water COCs will occur in the first quarter of 2010. <br /> Leachate <br /> Leachate samples are collected monthly from the sump under module 1. Field parameters <br /> measured monthly include: <br /> • Total flow <br /> ® pH <br /> • Flow rate <br /> • Electrical Conductivity <br /> 1 <br /> Leachate samples are analyzed annually for the following parameters as specified in the WDRs: <br /> • Chloride • Nitrate-Nitrogen <br /> • Total Dissolved Solids (TDS) . Sulfate <br /> • Calcium • Potassium <br /> • Magnesium . Sodium <br /> • Carbonate Alkalinity . Bicarbonate Alkalinity <br /> • VOCs • <br /> Leachate samples are analyzed for the following CDCs every 5 years: <br /> • Total Organic Carbon <br /> • Inorganics (dissolved) <br /> • VOCs (extended list) <br /> • Semi-Volatile Organic Compounds <br /> • Chlorophenoxy Herbicides <br /> • Organophosphorous Compounds <br /> Leachate samples were last analyzed for COCs during the first semester 2005 monitoring event. <br /> The next monitoring event for leachate COCs will occur during the first semester of 2010. <br /> Vadose Zone Soil Gas <br /> The soil is monitored for VOCs per the WDRs Order No. R5-2003-0020. Eleven wells, SG-1 <br /> through SG-11, are located around modules "I" and 1 (Figure 5). Well depths range from 25 feet <br /> to 68 feet. Gas from the soil gas trench under Module 1, designated SG-T, is also analyzed for <br /> VOCs. <br /> The Monitoring and Reporting Program requires that soil gas be monitored semi-annually. <br /> Samples are analyzed by a certified laboratory per EPA test method TO-14A. <br /> Foothill Sanitary Landfill 6 Department of Public Works/Solid Waste <br /> 2nd Semester and Annual 2008 Groundwater Monitoring County of San Joaquin—January 31,2009 <br />