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1.3 REASON FOR INSTALLING GW MONITORING WELL <br /> A. HARNEY LANE <br /> The 2009 Waste Discharge Requirements of HLSL requires two new GW <br /> monitoring wells to monitor upgradient GW conditions at the site. This <br /> project will involve instatallation of one GW monitoring well (MW-5) between <br /> the wastewater treatement ponds and the secondary site (Figure 5). The <br /> location of the second GW monitoring has not been determined at this time. <br /> B. NORTH COUNTY LANDFILL <br /> The existing GW monitoring well G-1 at NCRCSL is now dry because the <br /> GW elevation has dropped below the sampling interval. A replacement well <br /> is needed to maintain GW monitoring. The existing GW well G-1 will be re- <br /> drilled and and re-developed (Figure 2). <br /> 1.4 WELL LOCATION <br /> The location of the GW monitoring wells at both site are away from the <br /> footprint of the landfill. Well installation work will not include drilling into <br /> refuse or contact with refuse. Solid Waste Division (SWD) has staked the <br /> location of the new GW monitoring, MW-5, well at HLSL (Figure 1). <br /> Under ground service alert will be notified to mark all underground utilities <br /> at or near the drilling locations. Well locations will be adjusted based on site <br /> conditions. <br /> 2.0 DRILLING <br /> Drilling permits will be obtained from San Joaquin County Environmental Health <br /> Department (EHD) prior to drilling. The wells will be drilled and developed by a <br /> licensed Contractor. A hollow stem auger drill rig is anticipated to be used to drill <br /> the wells. <br /> The Contractor will be required to comply with the work plan and to construct the <br /> new GW monitoring wells per the construction drawings and specifications <br /> (Appendix A). A boring log will be compiled during drilling. Spoils will be <br /> dispersed around the drilled boring. <br /> 2.1 UNCOMPLETED BORINGS <br /> If a boring is not drilled to depth by the end of a working day, the hollow <br /> stem auger will be left in the uncompleted boring. The opening of the auger <br /> Work Plan-Groundwater Monitoring Well Installation San Joaquin County <br /> November 23,2009 Department Of Public Works <br /> 2 Solid Waste Division <br />