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1 is not now covered by closure cap will be covered in the cover extension project (Figure 4). The <br /> exposed sides of the pot-holes will be inspected for the layered prescriptive cover. <br /> The existing closure cap clay barrier layer will be repaired either with bentonite-amended soil or <br /> by placing geocomposite clay liner(GCL)in the excavation prior to replacing the excavated soil <br /> ' (Figure 5). These repairs will be certified by an engineer licensed in the state of California. <br /> Excavation of refuse will be avoided. <br /> Once the extent of the present closure cap has been delineated sufficiently to define the scope of <br /> work, the closure cap will be extended, and the drainage ditch relocated, to prevent further <br /> percolation of rainwater through the refuse. <br /> 1 Work will be done in accordance with the previously-approved Safety Plan(attached). <br /> 1 Proposed Corrective Action <br /> ' It is presently contemplated that corrective action will include extending the closure cap with GCL <br /> from the edge of the existing closure cap to the approximate mid-point of the road(Figure 6). The <br /> approach would include the placement of geocomposite clay liner(GCL) as hydraulic barrier from <br /> 1 the road to the edge of the existing closure cap. Placement of soil over the GCL will cause the <br /> relocation of the road and drainage ditch. <br /> Geocom osite Clay Liner Specifications <br /> GCL Model Bentofix Thermal Lock NWL orequivalent <br /> Bentonite content minimum 0.84 Ib/ft2 at 12% moisture <br /> 1 Grab Strength minimum 150 Ib average. roll value <br /> Permeability maximum 5x10 cm/sec <br /> 1 <br /> ' NAICorral Hollow\PlanToEvallmpactToGW\InvestugaGon Sept05ResuftsR2.doc 77 <br /> 1Vill- <br /> A <br /> Investigation of Groundwater Impact 4 San Joaquin County Public Works/Solid Waste <br /> ' Corral Hollow Sanitary Landfill March 3,2006 <br />