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0 <br /> WASTE DISCHARGE REQUIREMENTS -8- <br /> JOHNS-MANVILLE MANUFACTURING COMPANY, INCORPORATED <br /> FORMOSA PLASTICS. USA <br /> SAN JOAQUIN COUNTY <br /> tion Standard using procedures specified in Section 2550.7(e) of Chapter 15. The <br /> Water Quality Protection Standard is specified in Monitoring and Reporting Program <br /> No. <br /> Protection from Storm Events <br /> 6. Closure construction shall be accomplished in such a manner so as to prevent <br /> inundation or washout due to floods with a 100-year return period. Landfill related <br /> containment structures shall be constructed and maintained to prevent, to the greatest <br /> extent possible, ponding, infiltration, inundation, erosion, slope failure, washout, and <br /> overtopping under 100-year, 24-hour precipitation conditions. Surface drainage from <br /> tributary areas and internal site drainage from surface or subsurface sources shall not <br /> contact or percolate through wastes. <br /> 7. Annually, prior to the anticipated rainy season but no later than 1 November, any <br /> necessary erosion control measures shall be implemented, and any necessary con- <br /> struction, maintenance, or repairs of precipitation and drainage control facilities shall <br /> be completed to prevent erosion or floodin of the fact and to revent surface <br /> draina e from erodin the cover. <br /> 8. Surface drainage from tributary areas and internal site drainage from surface or <br /> subsurface sources shall not contact or percolate through wastes. <br /> 1111 <br /> LANDFILL CLOSURE SPECIFICATIONS <br /> 1. Landfill closure shall be under the direct supervision of a California registered civil <br /> engineer or certified engineering geologist. <br /> 2. The closed landfill shall be provided with at least two permanent monuments, <br /> installed by a licensed land surveyor, from which the location and elevation of all <br /> wastes, containment structures, and monitoring facilities can be determined through- <br /> out the post-closure maintenance period. <br /> 3. Each landfill or disposal area shall receive a final cover which is designed and <br /> constructed to function with minimum maintenance and consists, at a minimum, of a <br /> thrcc=,foot thick soil laver which may not contain any asbestos waste materials. <br />