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SEC77ON 1 -LANDFILL DCPANSION ISSUES Page 1-22 <br /> capable of emptying the basin in 48 hours for rural areas (ISSJC 3.45). A 10-year storm may be <br /> used for sizing local drainage facilities. Where protection of loss of life or substantial property <br /> damage is a concern, 50 year and 100 year design storms are required for design. Open " <br /> channels require a 100 year design capacity. (ISSJC 3.21). <br /> Table 1-6 compares the applicable regulations and design elements for the proposed landfill <br /> expansion. Appendix D includes surface water design calculations and presents in greater detail <br /> ISSJC design criteria. <br /> Table 1-6 <br /> SURFACE WATER CONTROL REGULATORY CRITERIA <br /> Citation Regulation Design Element <br /> Title 14, 17628 General Design Parameters: Each site ISSJC criteria used for surface water <br /> design shall be based on appropriate system design. <br /> data regarding... surface water.. <br /> Title 14, 17708 Drainage and Erosion Control:Adequate Run-on and run-off surface water <br /> drainage shall be provided. systems are designed for 100 year storm <br /> event.Storm water from active landfill to <br /> leachate collection system. <br /> This 14, 17710 Grading of Fill Surfaces:Covered Minimum closure grade is 5% <br /> surfaces of the disposal area shall be <br /> graded to promote lateral runoff of <br /> precipitation and to prevent ponding. <br /> ...sufficient slope to account for future <br /> settlement.. <br /> Title 14, 17776(a) (3) Final Grading: reduce run-off velocities to Maximum final grade is 250/®,Interception <br /> protect the final cover from soil erosion. ditches and sift fences will be used to <br /> control surface flow. <br /> Title 14, 17778(a) Final drainage system shall be designed, See Title 23,2546 below. <br /> constructed,graded, and maintained in <br /> accordance with Title 23, CCR, <br /> subchapter 15,section 2546(a) and <br /> approved by the local enforcement <br /> agency and the board. <br /> Title 14, 17778(b) The final drainage design shall be Conceptual design analysis in Appendix <br /> developed through an engineering D was prepared under the supervision of <br /> analysis by a registered civil engineer. a registered civil engineer. <br /> Title 14, 17778(c) To the extent feasible,based on site Site development will use phased ■ <br /> specific factors,the drainage system shall Intermediate and final closures as part of 1 <br /> be constructed, pursuant to section 17764 the leachate management operation <br /> ..as the site reaches final configuration. where feasible. <br /> Title 14, 17778, (e) (1) Design features to divert sheet run-off, Interception ditches and sift fences will <br /> laterally or the shortest distance,to a be used for control of sheet run-off. <br /> drainage channel and collection system. <br /> :1 <br /> A.W.Back a,o Associates City <br /> on Stockton 1 <br /> 1811.002 <br />