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• <br />• <br />2.2 TOPOGRAPHY <br />The proposed site and surrounding area consists primarily of gently rolling pas- <br />tureland. Two branches of South Paddy Creek traverse the north -central portion <br />of the site. Ephemeral water in these channels flows to the northwest. <br />Elevations at the site range from approximately 106 feet mean sea level (MSL) in <br />the northwest corner to 123 feet MSL in the southeast corner. Three small hills in <br />the northern portion of the site rise to elevations of 118 to 124 feet MSL. <br />2.3 LANDFILL <br />The proposed North County Sanitary Landfill will cover an area of approximately <br />320 acres. It will be constructed and operated to comply with Subchapter 15 <br />requirements. A permanent berm will be constructed around the landfill perime- <br />ter, which will define the limits of the landfill and protect it from contributory sur- <br />face water run-on which might enter the site boundary. <br />Maximum final landfill slopes will not exceed 12 percent along the perimeter <br />slopes to minimize erosion while preventing drainage slope reversal from landfill <br />settlement. Minimum final landfill slopes will be 3 percent to provide adequate <br />drainage and prevent ponding after anticipated settlement of wastes underlying <br />the upper landfill slopes. The landfill's maximum fill height will be approximately <br />65 feet above the existing ground to about elevation 170 feet. <br />2.4 SUBSURFACE CONDITIONS <br />2.4.1 Foundation Soils <br />The subsurface soil conditions were determined from previous subsurface inves- <br />tigations by EMCON and J.H. Kleinfelder and Associates (JHKA), Fresno, Cali- <br />fornia. Three ground -water monitoring wells and three permeameter borings <br />were drilled by EMCON in June 1987. The depths of these borings range from <br />40 to 165 feet below ground surface. JHKA drilled six borings 50 to 100 feet <br />PJ9 9390217.00W 3 Rev. 0 May 23, 1989 <br />