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WASTE DISCHARGE REQUIREMENTS -9- <br /> JOHNS-MANVILLE MANUFACTURING COMPANY, INCORPORATED <br /> FORMOSA PLASTICS, USA <br /> SAN JOAQUIN COUNTY <br /> 4. Vegetation shall be planted and maintained over each closed landfill unit. Vegetation <br /> shall be selected to require a minimum of irrigation and maintenance and shall have a <br /> rooting depth not in excess of the cover thickness. <br /> 5. Closed landfill modules shall be graded to at least a three. percent grade and <br /> maintained to prevent ponding. <br /> 6. Areas with slopes greater than ten percent, surface drainage courses, and areas subject <br /> to erosion by wind or water shall be designed and constructed to prevent such <br /> erosion. <br /> SURFACE IMPOUNDMENT CLOS , <br /> 7. At clostim of stniiwk, , <br /> „ <br /> Board. !Faftei . a <br /> Alternatively, if the Discharger leaves the existing wastes in place, then <br /> the surface impoundments shall be closed as landfills pursuant to the above-listed <br /> Landfill Closure Specifications. <br /> D. Provisions: <br /> 1. The Discharger shall M a timely manner, remove and relocate any wastes discharged <br /> at this facility in violation of this Order. <br /> 2. The Discharger shall notify the Board in writing of any proposed change in ownership <br /> or responsibility for the facility. This notification shall be given 90 days prior to the <br /> effective date of the change. <br />