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- The rainfall intensity, I. This will be obtained from the Intensity-Duration-Frequency <br /> tables in the hydrology manual. As necessary, Inlet Time or time of Concentration <br /> (t�)will be assessed to determine the applicable intensity, I, for each calculation. <br /> - <br /> Contributory drainage subareas, Ax. This will be delineated and measured on each <br /> module plan for the drainage analyses. <br /> 2. Conveyance Facilities - Ditches and drainage pipes will be sized for peak design flows, <br /> and the potential for erosion will be assessed. Ditch lengths predicted to have excessive <br /> ' erosion will be lined with appropriate erosion control measures. Use of select cobbles or <br /> inert waste material from on-site sources will be used where appropriate. <br /> 3. Vegetation_ -The soil cover will be vegetated with native plants or compatible species. <br /> The partial cover soil will be analyzed by Revised Universal Soil Loss Equation for areas <br /> of potential excessive soil loss and protected with appropriate surface control measures. <br /> 1 <br /> 5.0 Partial Cover and Drainage Plan <br /> The"Partial Cover and Drainage Plan" for Module"I"will include: <br /> 1. A topographic map at suitable scale by aerial photometric methods or by land surveying. <br /> Contours will be provided in two-foot intervals. The survey will be on the basis of <br /> previously used survey monuments. <br /> 2. Verification of the thickness and characteristics of existing soil cover at select locations. <br /> This will be accomplished by excavation(probably by hand)through the existing cover <br /> to verify cover thickness. Excavations will be perpendicular to the landfill slope. The <br /> results of this investigation will be presented in a map,identifying areas requiring <br /> additional fill, if any. <br /> 3. Verification of the adequacy of the existing drainage and identify improvements needed. <br /> ' Supportive drainage calculations will be appended. <br /> 4. Assessment of the need for a slope stability analysis for the unlined refuse fill. Stability <br /> analysis will be performed if needed. <br /> - 5. The estimated timetable for design and construction of improvements,if competitive <br /> bidding is needed. <br /> October 28,2003 4 Foothill Sanitary Landfill <br /> Partial Cover Workplan Public Works/Solid Waste <br />