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MW-6 <br /> No general water quality parameter concentration limits were exceeded and no VOCs were <br /> detected in MW-6 during this period. <br /> MW-6 like MW-1 serves as a background well for the landfill. <br /> Evaluation of Impact to Groundwater by Off-Site 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 all cases, constituents are lower in background well <br /> MW-6, then rise in well MW-5, and then fall in wellMW-4A (see table below). <br /> Monitoring Wells <br /> Constituent MW-6 MW-5 MW-4A <br /> (upgradient of (down gradient of (downgradient of <br /> ponds) ponds and MW-5) <br /> upgradient of MW-4) <br /> EC (us/cm) 293 917.4 440.1 <br /> Calcium (mg/L) 21 93 17 <br /> Magnesium (mg/L) 9.5 49 10 <br /> Alkalinity (as CaCO3, 97 420 130 <br /> mg/L) <br /> Hardness (as CaCO3, 86 430 83 <br /> mg/L) <br /> Surface Water <br /> As noted previously, Surface water samples are no longer taken at this site. CCR Title 27 <br /> Section 20415 (c) "Surface Water Monitoring Systems" paragraph (1) "General' requires that <br /> "The discharger shall establish a surface water monitoring system to monitor each surface water <br /> body that could be affected by a release from the Unit." <br /> The physical configuration of the landfill, including berms and retention ponds, makes it highly <br /> unlikely that a release to the "surface water" (drainage ditch south of the retention pond) would <br /> occur. The County is in the process of preparing a report to demonstrate that even a thousand- <br /> year (1000-year) storm will not cause a release from the unit. <br /> Storm Water <br /> There were no storm water discharges to the waters of the State (drainage ditch) during this <br /> reporting period. Storm water sampling locations SW-1, SW-2, and SW-3 were not sampled due <br /> to the absence of water. Any discharge to the waters of the State would require the manual <br /> operation of the pumps in the retention basin to pump into the drainage ditch. <br /> Harney Lane Sanitary Landfill 6 Department of Public Works/Solid Waste <br /> 1"Semiannual 2014 Groundwater Monitoring Report County of San Joaquin—July 31,2014 <br />