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Groundwater Elevation Total dissolved solid (TD <br /> S) <br /> (T S) <br /> Temperature Chloride <br /> Electrical conductivity(EC) Sulfate <br /> pH Nitrate-nitrogen <br /> Turbidity Volatile organic compounds(VOCs) <br /> Groundwater samples are analyzed semi-annually for these additional parameters: <br /> Carbonate Magnesium <br /> Bicarbonate Potassium <br /> Calcium Sodium <br /> Groundwater samples are analyzed every five (5)years for the following Constituents of Concern <br /> (COCs). The next groundwater COC monitoring is scheduled for the first quarter of 2015 per the <br /> WDRs. <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-11A 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, which defines the limit of the shallow <br /> aquifer beneath the landfill, discontinues west of these wells (Figure 2). <br /> Wells MW-9A, -IOA, 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. However, an upcoming revision of the <br /> Corral Hollow Sanitary Landfill 10 Department of Public Works/Solid Waste <br /> 2nd Quarter 2014 Groundwater Monitoring County of San Joaquin—July 15,2014 <br />