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FINAL SITE FACE <br /> Final landfill slopes are vegetated with Bromme and other natural <br /> grasses. The vegetation helps stabilize slopes and reduce erosion. <br /> The rooting depth of the grass will not exceed the thickness of the <br /> one foot vegetative cover layer, so the clay barrier layer will not <br /> be disturbed. The hydroseed will remain dormant until the rainy <br /> season, therefore no irrigation is necessary. The grass will be <br /> fertilized annually as needed, but will not require irrigation <br /> other than natural rainfall. <br /> DRAINAGE CONTROL <br /> The drainage facilities are designed in accordance with the County <br /> of San Joaquin Department of Public Works, Manual for Storm <br /> Drainage Design (January 1973) , except that the drainage facilities <br /> at the landfill are sized to accommodate the volume and peak flow <br /> rate expected from a storm having a 100 year-24 hour frequency <br /> instead of the 10 year frequency. The drainage facilities also <br /> meet all CIWMB closure regulations. <br /> The drainage system consists of a system of intercept berms with V- <br /> ditches built into the side slopes, bottom perimeter V-ditches, two <br /> culvert crossings, and two detention basins. Final grades for the <br /> top surface of the landfill were constructed to a minimum slope of <br /> 6 <br />