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No VOCs were detected in MW-6 during the first semester 2013 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 /> MW-6, like MW-1 is upgradient of the landfill. <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 MW-4 (see table 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) 301.1 859.1 677.3 <br /> Calcium (mg/L) 19 83 19 <br /> ® Magnesium (mg/L) 9.2 46 10 <br /> Alkalinity (as CaCO3, 110 390 110 <br /> mg/L) <br /> Hardness (as CaCO3, 86 400 91 <br /> mg/L) <br /> Surface Water <br /> Surface water samples were collected December 27, 2012. Samples are taken if sufficient water <br /> is flowing at sampling points during the wet season. The dry climate at this site makes <br /> collection of surface water difficult. All concentrations of field parameters and constituents of <br /> concern were below established concentration limits where the limits could be determined. <br /> Storm Water <br /> There were no storm water discharges to the waters of the State during this reporting period. <br /> Such discharge requires the manual operation of the pumps in the retention basin to pump into <br /> the drainage ditch. <br /> Ramey Lane Sanitary Landfill 8 Department of Public Works/Solid Waste <br /> 1"Semester 2013 Groundwater Monitoring Report County of San Joaquin—July 15,2013 <br />