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WASTE DISCHARGE REQ_U*1r'tMENTS -6- <br /> CITY OF STOCKTON <br /> AUSTIN ROAD LANDFILL <br /> CLASS III LANDFILLS <br /> SAN JOAQUIN COUNTY <br /> CLOSURE SPECIFICATIONS <br /> 12. Closure of the landfill shall be under the direct supervision of a <br /> California registered civil engineer or certified engineering <br /> geologist. <br /> 13. Closed WMUs shall be provided with at least two permanent monuments, <br /> installed by a licensed land surveyor or a registered civil engineer <br /> authorized to perform land surveying, from which the location and <br /> elevation of all wastes , containment structures , and monitoring <br /> facilities can be determined throughout the post-closure maintenance <br /> period. <br /> Landfill Closure <br /> 14. At closure, each landfill unit shall receive a final cover which is <br /> designed and constructed to function with minimum maintenance and <br /> consists , at a minimum, of a two-foot thick foundation layer which <br /> may contain waste materials, overlain by a one-foot thick clay liner, <br /> and finally by a one-foot thick vegetative soil layer, or an <br /> engineered equivalent final cover approved by the Board pursuant to <br /> Subsections 2510(b) and (c) of Subchapter 15. <br /> 15. Vegetation shall be planted and maintained over each closed landfill <br /> unit. Vegetation shall be selected to require a minimum of irrigation <br /> and maintenance and shall have a rooting depth not in excess of the <br /> vegetative layer thickness. <br /> 16. Closed landfill cells shall be graded to at least a three-percent <br /> grade and maintained to prevent ponding. <br /> 17. Areas with slopes greater than ten percent, surface drainage courses, <br /> and areas subject to erosion by wind or water shall be designed and <br /> constructed to prevent such erosion. <br /> C. Provisions: <br /> 1. The Discharger shall , in a timely manner, remove and relocate any <br /> wastes discharged at this facility in violation of this Order. <br /> 2. The Discharger shall maintain a copy of this Order at the facility and <br /> make it available at all times to facility operating personnel , who <br /> shall be 17amil -lar with its Contents , and Lo regulatory agency <br /> personnel . <br />