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will be 1.0 foot thick. This layer will be planted with drought <br /> resistant grass which should not require irrigation. <br /> The maximum extent of the landfill that will ever require closure <br /> at any given time is estimated to be 50 acres. Since the <br /> landfill will be closed in modules, the most expensive closure <br /> time would occur when one 20 acre module has been filled, the <br /> next 20 acre module has begun to accept waste, and a third module <br /> has been partially excavated (10 acres) . In this case, the <br /> filled module (20 acres) , the module receiving waste (20 acres) , <br /> and one half of the module being excavated (10 acres) would have <br /> to be revegetated (50 acres total) . <br /> 3 . COST <br /> a. Soil preparation @ $250 AC x 50 acres = $ 12, 500 <br /> b. Plant Bromme grass @$750 AC x 50 acres= $ 37, 500 <br /> C. 16-20-0 fertilizer @$120 AC x 50 acres= $ 6, 000 <br /> d. Mulching @ $500 AC x 50 acres = $ 25 , 000 <br /> $ 81,000 <br /> LANDFILL GAS MONITORING SYSTEM <br /> A landfill gas monitoring system will be installed at the <br /> Foothill Sanitary Landfill. It will consist of approximately 23 <br /> perimeter monitoring wells with 3 gas monitoring probes in each <br /> well. The perimeter wells will be spaced no more than 1000 feet <br /> apart and they will be drilled to the lowest elevation of refuse <br /> within 1000 feet from the monitoring point. The probes will be <br /> installed as each module is developed. <br /> Should closure occur at any time in the landfill life, it is <br /> estimated that a maximum of 4 additional perimeter monitoring <br /> wells would provide sufficient coverage for the modified landfill <br /> closure. <br /> 5 . COST <br /> A three probe gas well is estimated at $3 , 000 each <br /> (4 X $3, 000) _ $12,000 <br /> is 22 <br />