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3 MONITORING PROGRAM <br /> 3.1 Water Quality Monitoring <br /> 3.1.1 Groundwater Monitoring <br /> The groundwater well network for LF-1 and LF-2 consists of up gradient well MW-4 and <br /> down gradient wells MW-2R, MW-3, MW-5 and MW-6. Well MW-lA, which had <br /> previously been considered up gradient, was found to be cross gradient from the landfill, <br /> and not down gradient of any portion of the landfill, as evident by regular water level <br /> monitoring. LF-1 is under corrective action monitoring and LF-2 is under detection <br /> monitoring. The monitoring wells in each of these programs are described in Section 4. <br /> 3.1.2 Surface Water monitoring <br /> Surface water samples are collected from points SW-1 and SW-2 for both LF-1 and LF-2. <br /> 3.1.3 Unsaturated (Vadose) Zone Monitoring <br /> Soil pore samples are collected from lysimeters LZ-1, LZ-2, LZ-3, LZ-4, LZ-5, and pan <br /> lysimeters under the lined units. LZ-1 is the background vadose zone monitoring <br /> lysimeter. In addition, soil gas samples will be collected from the 25 tri-level perimeter <br /> soil gas probes SG-12 and SG-102 through SG-125. <br /> In addition, LF-1 is monitored with soil gas probes SG-1, SG-2A, SG-3A, SG-4, SG-5, <br /> SG-6A, SG-7, SG-9, SG-10A, and SG-I IA situated around the perimeter of LF-1. The <br /> locations designated with an"A" are tri-level monitoring probes. <br /> The monitoring points for LF-1 and LF-2 are shown on Figure 2. <br /> 3.2 Sampling Procedures <br /> Water quality samples are collected on a semiannual basis from all points accept MW-3, <br /> which is sampled quarterly. Samples are analyzed for the constituents listed in WDR <br /> Order No. R5-2015-0058. Samples are collected, preserved, and then transported with <br /> the appropriate chain-of-custody documentation to a state-certified laboratory for <br /> analyses. Groundwater elevation measurements are taken at each well prior to sampling. <br /> The sampling and analysis procedures for LF-1 and LF-2 are provided in Appendix A. <br /> Also provided in Appendix A are the following: <br /> Foothill WQPS Rev Ldoc <br /> 3-1 <br />