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WASTE DISCHARGE REQUIREMENTS -11- FORWARD INC..FORWARD LANDFILL SAN JOAQUINCOUNTY 13. Annually,prior to the anticipated rainy season, any necessary erosion control measures shall be implemented. and any necessary construction, maintenance, or repairs of precipitation and drainage control facilities shall be completed to prevent erosion or flooding of the site and to prevent surface drainage from contacting or percolating through wastes. LANDFILL SPECIFICATIONS 14. Municipal solid waste shall be discharged to either(1) that portion of a waste management unit which received wastes (i.e.. that active portion of the waste management unit which is within the boundaries of the Existing Footprint), or(2) to an area equipped with a containment system which meets the additional requirements for both liners and leachate collection systems specified below. 15. All containment systems installed after 9 October 1993 shall either: (1) include a composite liner which consists of an upper synthetic flexible membrane component(synthetic liner or SL)and a lower component of soil. The SL shall be at least 40-mils thick(or at least 60-mils thick if of high density polyethylene)and shall be installed in direct and uniform contact with the underlying compacted soil component. The lower component shall be compacted soil that is at least two feet thickand that has an hydraulic conductivity of no more than 1 x 10-7 cm/ (this specification is referred to as the Prescriptive Design); or(2) an engineered alternative approved by the Executive Officer. 16. All containment systems installed prior to 9 October 1993 where wastes have not been discharged and which will accept wastes after 9 October 1993 shall include a composite liner which features as its uppermost component a synthetic liner(SL). The SL shall be at least 40- mils thick(or at least 60-mils thick if high density polyethylene) and shall be installed in direct and uniform contact with the underlying materials.The composite liner shall meet the performance criteria contained in 40 CFR 258.40(a)(1) and (c). For steep sideslopes (as defined in Specification B.16., below)the composite 40 mil(60 mil if HDPE) specification may be replaced by a non-composite 60 mil (80 mil if HDPE)specification. 17. Containment systems installed in those portions of a landfill where an engineering analysis shows that sideslopes are too steep to permit construction of a stable composite liner that meets the prescriptive standards contained in either B.14. or B.15.,above shall include an alternative liner on the sideslopes that both meets the performance criteria contained in 40 CFR 258.40(a)(1) and(c) and either: (1) is a composite liner and includes as its uppermost component a synthetic liner at least 40-mils thick(or at least 60-mils if high density polyethylene) that is installed in direct and uniform contact with the underlying materials: or(2)is not a composite liner, but includes a synthetic liner at least 60-mils thick(or at least 80-mils if of high density polyethylene) that is installed in direct and uniform contact with the underlying materials. 18. New landfill units and lateral expansions shall not be located in wetlands unless the discharger has successfully completed.and the Board has approved,all demonstrations required for such discharge under 40 CFR 258.12(a).