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11 <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 />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 (Figure 4). <br />Minimum slope of three percent complies with Title 27 Section 21090 5b1. Maximum <br />slope of all grades shall 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 (Figure 4). The <br />access road will be twelve feet wide and constructed with Class II Aggregate base. A <br />storm water permit (Permit NO 5S39C346216) has been secured by the Regional Water <br />Quality Control Board (RWQCB), specifically for this project. <br />Upon placement of the vegetative cover, the closure cap extension area and any <br />disturbed soil surface will be smoothed and seeded with brome grass. Vegetation will <br />help minimize erosion and provide a low maintenance form of erosion control. Seeding <br />of the project area will be complete prior to the rainy season; thus no irrigation will be <br />necessary. <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 />landfill (Figure 2, 3). It <br />Soil added over the closure extension area will raise the elevation by approximately one <br />foot. To maintain the existing drainage pattern, approximately one foot of soil will be <br />added "uphill" of the closure extension area on the northern side of the landfill, allowing <br />water to continue to flow east. The drainage ditch along the access road will be filled <br />during the extension of the closure cover, but a similar drainage ditch will be built at <br />approximately the same alignment as the previous ditch. <br />Closure Plan Addendum San Joaquin County <br />Corral Hollow Sanitary Landfill 7 Department of Public Works <br />April 4, 2008 Solid Waste Division <br />