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8.3 LOW-HYDRAULIC CONDUCTIVITY LAYER <br /> The low conductivity layer will be provided by a geocomposite clay liner (GCL) <br /> Bentofix Thermal Lock, or equivalent, meeting the following minimum specification: <br /> Bentonite content: 0.84 Ib/ft2 at 12% moisture <br /> Grab Strength: 150 Ib minimum average roll value <br /> Permeability: 5x10-9 cm/sec maximum <br /> 8.4 EROSION-RESISTANCE (VEGETATIVE) LAYER <br /> The vegetative layer cover will be mostly soil from on site. All soil cover will be <br /> free of refuse and debris. On site soil is capable of sustaining native or other <br /> suitable plant growth. <br /> 9.0 FINAL GADING <br /> The closure cap extension area will not significantly change the existing slopes. The final <br /> grade of the closure cap extension cover will be minimum of three percent (Plan Sheet 3 <br /> and 4). Minimum slope of three percent complies with Title 27 Section 21090 5b1 . <br /> Maximum slope of all grades will not exceed ten percent. <br /> Final grading of the closure cap extension area will also involve re-constructing the north <br /> eastern access road, over the vegetative layer of the extended cap (Plan Sheet 3 and 5). <br /> The access road will be twelve feet wide and constructed with Class II Aggregate base. A <br /> storm water permit will be secured by the Regional Water Quality Control Board <br /> (RWQCB), specifically for this project. <br /> 10.0 FINAL SITE FACE <br /> Upon placement of the vegetative cover, the closure cap extension area and any <br /> disturbed soil surface will be smoothed and hydro seeded. Hydro seeding of the <br /> newlydisturbed surfaces area will be complete prior to the rainy season; thus no irrigation <br /> will be necessary. <br /> Vegetation will help minimize erosion and provide a low maintenance form of erosion <br /> control. . <br /> 11.0 INSTALLATION OF DRAINAGE CONTROL <br /> The existing drainage pattern will be restored at the conclusion of the closure cap <br /> extension of the closure cap. Storm water run-off from the north-east, eastern, and <br /> southern portion of the landfill will drain into the retention pond, and storm water run-off <br /> from the north western portion of the landfill will drain into the retention area west of the <br /> Closure Plan Revised Addendum San Joaquin County <br /> Corral Hollow Sanitary Landfill 7 Department of Public Works <br /> October 6, 2011 Solid Waste Division <br />