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• Soil gradation for drainage to limit infiltration and to control soil loss based on RUSLE. <br /> • Rational Method for flow rate calculations per Appendix E of the ROWD. <br /> B. The design will include the following typical drainage features: <br /> • Crest berms and side slope benches <br /> • Ditches on benches <br /> • CMP inlets and overside drains <br /> • Erosion control and energy dissipaters as necessary to prevent erosional damage. <br /> C. Shallow Refuse Lift Areas (Approximately 3 acres): Long term cover will be applied to the <br /> shallow refuse lift area(approximately 3 acres). At this time, we anticipate that the <br /> minimum design criteria will include: <br /> Minimum thickness=4 feet. <br /> • Cover soil characteristics: minimum 25%passing number 200 sieve per ASTM D-422 <br /> • Minimum slope =3 percent <br /> Maximum slope= 2:1 <br /> PROJECT SCHEDULE <br /> The project schedule(attached)indicates the activities anticipated to execute the strategy. These <br /> activities include: <br /> A. Preparation and issuing three contracts, including: <br /> • Engineering services for the design of the project components <br /> • Engineering services for third-party Quality Assurance during construction to certify that <br /> the landfill liner is installed in accordance with the WDRs as implemented in the design <br /> • Installation and operation of a LFG-to-energy facility <br /> B. Preparation and submittal of the Project Design Report. The County will perform as much <br /> work as possible in advance of review of this report,but many aspects of detailed design and <br /> related permitting documents will depend on review and comments by RWQQCB staff on <br /> the information in this document. <br /> C. Preparation and review of relevant regulatory documents (with the regulatory agency <br /> primarily responsible for review), including: <br /> • Preliminary Closure Plan and Post Closure Maintenance Plan(LEA/CIWMB) after <br /> review and acceptance of the Project Design Report. <br /> • Quality Assurance Plan associated with the Preliminary Closure Plan(LEA/CIWMB) <br /> based on closure method selected per review of the Project Design Report <br /> • Partial Final Closure Plan(LEA/CIWMB),based on the Preliminary Closure Plan <br /> Foothill Sanitary Landfill Site.Improvement 6 Department of Public Works/Solid Waste <br /> Revised March 12,2004 County of San Joaquin <br />