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Simulation of Title 27 Prescriptive Final Cover Performance <br />Performance of Title 27 Prescriptive Final Cover will be simulated using the HELP model, configured <br />for an intact barrier layer (Table 1). Actual site data for precipitation, air temperature, humidity and solar <br />radiation, as measured at the ET test pad during the test period will be input to the HELP model. <br />Simulated percolation through of Title 27 Prescriptive Final Cover (TPT27) will represent the <br />performance of the prescriptive Title 27 final cover. <br />If TPTs is less than or equal to TPT27, then the ET final cover constructed at Foothill Landfill will be <br />demonstrated to perform the same as, or better than, the Title 27 prescriptive final cover. <br />Table 1 <br />HELP Model Configuration <br />Foothill Sanitary Landfill ET Test Pad Performance Assessment <br />I Parameter I Value I <br />Type Vegetative layer per Title 27 (Vertical Percolation Layer) <br />Material Texture Number 7 (USCS, SM) <br />Thickness 12 inches <br />Initial Soil Water Content As initialized by HELP <br />Laver 2 <br />Type Barrier Soil Layer per Title 27 <br />Material Texture Number 17 with HC set to 1 E-6 cm/sec <br />Thickness 12 inches <br />Initial Soil Water Content As initialized by HELP <br />ILa <br />Type <br />Foundation Layer per Title 27 (Vertical Percolation Layer) <br />Material Texture Number <br />10 (USCS, SC) <br />Thickness <br />24 inches <br />Initial Soil Water Content <br />As initialized by HELP <br />SCS Runoff Curve # <br />Calculated by HELP <br />Condition of Surface Vegetation <br />Fair stand of grass <br />Surface Sloe <br />3% <br />Sloe Length <br />100 Feet <br />Fraction of Area Allowing Runoff <br />100% <br />Projected Area <br />1 Acre <br />Zone Depth <br />12 inches <br />otrans iration Data <br />HELP Default data for Sacramento, adjusted to Lat. 38.4 (Foothill) <br />oEvaporative <br />Area Index <br />2 <br />t of Growing Season <br />Day 73 <br />of Growing Season <br />Day 319 <br />Average Annual Wind Speed <br />Onsite weather station data <br />Average Quarterly Rel. Humidity <br />Onsite weather station data <br />Precipitation <br />Onsite weather station data <br />Temperature <br />Onsite weather station data <br />Solar Radiation <br />Onsite weather station data <br />Foothill Sanitary Landfill 2 Public Works/Solid Waste <br />Er Test Pad Acceptance Criteria County of San Joaquin — June 12, 2006 <br />