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Surface water samples are also analyzed for the following COCs every 5 years: <br /> • Total Organic Carbon <br /> • Inorganics (dissolved) <br /> • VOCs (extended list) <br /> t • Semi-Volatile Organic Compounds <br /> • Chlorophenoxy Herbicides <br /> • Organophosphorous Compounds <br /> Surface water samples were last analyzed for COCs during the fourth quarter 2004 monitoring event. The <br /> next monitoring event for surface water COCs will occur during the first quarter of 2010. <br /> Leachate <br /> ' Leachate samples are collected monthly from the sump under module 1. Field parameters measured monthly <br /> include: <br /> • Total flow • Flow rate <br /> • pH • Electrical Conductivity <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 COCs 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. The next <br /> 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 through SG- <br /> 11, are located around modules "I" and 1 (Figure 5). Well depths range from 25 feet to 68 feet. Gas from <br /> the soil gas trench under Module 1, designated SG-T, is also analyzed for VOCs. <br /> Foothill Sanitary Landfill 7 Department of Public Works/Solid Waste <br /> I-Semester Groundwater Monitoring County of San Joaquin—July 31,2007 <br />