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0 <br /> ORDER AMENDING WASTE DISCHARGE REQUIREMENTS _3_ <br /> FOR MUNICIPAL SOLID WASTE LANDFILLS <br /> IT IS HEREBY ORDERED that the Dischargers listed in Attachment 1, and their agents, assigns, <br /> and successors, in order to meet the provisions of Division 7 of the California Water Code, and the <br /> regulations adopted thereunder, shall comply with the following: <br /> A. PROHIBITIONS <br /> As of the Federal Deadline, discharges of waste to either an MSWLF that has not received <br /> wastes as of that date or to a lateral expansion of an MSWLF unit are prohibited, unless the <br /> discharge is to an area equipped with a containment system which meets requirements in <br /> B. Specifications, specified below. <br /> B. SPECIFICATIONS <br /> 1. As of the Federal Deadline, municipal solid waste shall be discharged to either(1) that portion <br /> of a waste management unit which received wastes prior to the Federal Deadline (i.e., that <br /> active portion of the waste management unit which is within the boundaries of the Existing <br /> Footprint), or(2) to an area equipped with a containment system which meets the additional <br /> requirements for both liners and leachate collection systems specified below. <br /> 2. All containment systems installed after the Federal Deadline shall either: (1) include a <br /> composite liner which consists of an upper synthetic flexible membrane component(SL) and a <br /> lower component of soil. The SL shall be at least 40-mils thick (or at least 60-mils thick if of <br /> high density polyethylene) and shall be installed in direct and uniform contact with the <br /> underlying compacted soil component. The lower component shall be compacted soil that is at <br /> least two feet thick and that has an hydraulic conductivity of no more than I x 10-7 cm/sec <br /> (this specification is referred to as the Prescriptive Design); or(2) satisfy the performance <br /> criteria contained in 40 CFR 258.40(a)(1) and (c) and the criteria for an engineered alternative <br /> as provided by 23 CCR 2510(b), where the performance of the alternative containment <br /> system's components, in combination,equal or exceed the waste containment capability of the <br /> Prescriptive Design. <br /> 3. All containment systems installed prior to the Federal Deadline and which will accept wastes <br /> after the Federal Deadline shall include a composite liner which features as its uppermost <br /> component a synthetic liner(SL). The SL shall be at least 40-mils thick(or at least 60-mils <br /> thick if high density polyethylene) and shall be installed in direct and uniform contact with the <br /> underlying materials. The composite liner shall meet the performance criteria contained in <br /> 40 CFR 258.40(a)(1) and (c). For steep sideslopes (as defined in specification 4., below) the <br /> composite 40 mil (60 mil if HDPE) specification may be replaced by a non-composite 60 mil <br /> (80 mil if HDPE) specification. <br /> 4. Containment systems installed in those portions of an MSWLF where an engineering analysis <br /> shows that sideslopes are too steep to permit construction of a stable composite liner that meets <br /> the prescriptive standards contained in either B.2. or B.3., above shall include an alternative <br />