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Closure and Post-Closure Maintenance Plan Plans for the closure of the two waste water impoundments, per Title 23 Subchapter 15 requirements, for the southwest Hide Company Manteca Property, are as follows. Projected Schedule for Closure: Closure for the two Southwest Hide Company surface impoundments in Manteca, California can begin as soon as the brine recycling system has been completed ,nd successfully tested. The estimated date for this is July of 1990. Reclaiming of the salt in the existing ponds will be the first task. This will allow for a thorough inspection of the pond bottom. Waste Treatment Procedures: The liquid waste from the two surface impoundments will be run through a !gine recycling system that will be operating on site prior to the start of any work on the evaporation ponds. The remaining solid waste in the surface impoundments in composed almost entirely of NaCl and an attempt will be made to utilize this material on-site by means of recycling. If the recycling does not prove a viable alternative, the material will be disposed of at a waste site of proper designation. Topographic Map: Topographic maps of the two surface impoundments are included in the Report of Waste Discharge, prepared for Southwest Hide Company in April of 1989. A copy of this topographic map is included here in appendix B. A topographic I IF other surface impoundment is not available but copies of the original designs Tor both ponds are included in the Report of Waste Discharge, 1989, pages IV-2 and IV-3. The technical specifications for these salt brine evaporation ponds are also included in the Report of Waste Discharge in appendix E. The results c,." .:n engineering soils report, conducted prior to the construction of the evaporation ponds, are also included in appendix E of this report. Waste Containment Features: No waste containment features are herein described because the entire industri output will be run through the brine recycling system and, as stated above, t►i:, surface impoundments will not be removed until the system is operaLing. Precipitation and Drainage Control : Because the surface impoundment area will be completely covered with asphalt paving, the final precipitation and drainage control features will consist of a normal subsurface drainage system adequately designed to handle the required storm event. As of this time a diagram of this proposed drainage system does rot exist, however, none of the precipitation striking the asphalt surface will c_ .. .' in contact with the material used in the construction of the evaporate- l ponds. In addition to this, no runoff will be drained into or near the area of th., surface impoundments. Storm water runoff will be contained on the Sri i,west Hide Co. property. Salt used in the brine process will be contain.: A this, the industrial process.