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Groundwater anal are samples zed every five (5) years for the following Constituents of Concern <br /> P Y <br /> (CDCs). COCs were last monitored in the third.quarter of 2009. The next groundwater COC <br /> monitoring scheduled for the third quarter of 2014. <br /> The COCs are: <br /> Total Organic Carbon Semi-Volatile Organic Compounds <br /> Inorganics(dissolved) Chlorophenoxy Herbicides <br /> Volatile Organic Compounds(extended list) Organophosphorus Compounds <br /> Shallow Aquifer Monitoring <br /> Wells SB-1, MW-4, MW-5, MW-8, MW-9A, MW-10A, and MW-11A monitor the shallow <br /> aquifer(Figure 1). Well SB-1 is an up gradient well, whereas wells MW-4, MW-5, MW-8, <br /> MW-9A, MW-10A, and MW-I IA are down gradient. Piezometer PZ-1 is in the shallow aquifer, <br /> but recent soundings have not detected water. Flow in the shallow aquifer is offsite to the north <br /> from the SB-1 location(Figure 2). The Corcoran Clay discontinues west of these wells, which <br /> defines the limit of the shallow aquifer beneath the landfill (Figure 2). <br /> Wells MW-9A, -10A, and -11A were installed beyond the County property in February 2012 to <br /> increase the ability to monitor the shallow aquifer. <br /> Deep Aquifer Monitoring <br /> Wells MW-6 (down gradient) and MW-7 (up gradient) monitor the deep aquifer. <br /> Surface Water <br /> When flowing, Corral Hollow Creek is sampled upstream of the waste management facility at <br /> background monitoring point S-1 and downstream at monitoring point S-2 (Figure 1). Samples <br /> are collected after the first storm of the rainy season that produces significant flow and <br /> ' semi-annually thereafter, when water is flowing. <br /> Surface water samples are analyzed semi-annually for the following field and monitoring <br /> parameters in accordance with the WDRs: <br /> Temperature Carbonate <br /> Electrical Conductivity Bicarbonate <br /> pH Calcium <br /> Turbidity Magnesium <br /> Total Dissolved Solids Potassium <br /> Chloride Sodium <br /> Sulfate Volatile Organic Compounds <br /> Nitrate-nitrogen <br /> Corral Hollow Sanitary Landfill 10 Department of Public Works/Solid Waste <br /> Is'Quarter 2014 Groundwater Monitoring County of San Joaquin—March 15,2014 <br />