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MW-5 was installed between the sewage treatment ponds of the migrant labor camp and the <br /> "Secondary Site" portion of the site. The purpose of this well is to determine if the treatment <br /> ponds were contributing constituents to groundwater. <br /> MW-6 <br /> Concentrations of all the parameters analyzed were within established concentration limits this <br /> semester except for Turbidity (Table 1). <br /> No VOCs were detected in MW-6 during the first quarter 2012 sampling event. <br /> MW-6 was installed upgradient of the treatment ponds to serve as a background well for the site, <br /> especially to address RWQCB staff concerns regarding increased alkalinity due to landfill gas. <br /> Evaluation of Impact to Groundwater by Wastewater Treatment Ponds <br /> A review of the general chemical constituents indicates that the treatment ponds appear to act as <br /> a source of constituents in groundwater. In general, several constituents are lower in background <br /> well MW-6, then rise in well MW-5, and then fall in well MW4. This is illustrated below: <br /> Monitoring Wells <br /> Constituent MW-6 MW-5 MW-4 <br /> (Newly installed (Newly installed (downgradient) <br /> upgradient) South of ponds <br /> North of MW-4) <br /> EC (us/cm) 322.2 890.3 694.3 <br /> Calcium (mg/L) 21 83 52 <br /> Magnesium (mg/L) 9.9 46 28 <br /> Alkalinity (as CaCO3, 120 390 150 <br /> mg/L) <br /> Hardness (as CaCO3, 93 400 240 <br /> mg/L) <br /> Surface Water <br /> Surface water samples were not collected during this semester due to lack of flowing water during <br /> this winter. Surface water samples were last collected on January 31, 2011. Samples are taken <br /> if sufficient water is flowing at sampling points during the wet season. The dry climate at this site <br /> makes collection of surface water difficult. All concentrations of field parameters and <br /> constituents of concern were below established concentration limits where the limits could be <br /> determined with the exception of Nitrate in SWA and Sulfate in SW-2, which slightly exceeded <br /> concentration limits. <br /> Hamey Lane Sanitary Landfill 8 Department of Public Works/Solid Waste <br /> 1 st Semester 2012 Groundwater Monitoring Report County of San Joaquin—July 31,2012 <br />