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Mr. Jack L. Ronsko <br /> Page 2 <br /> September 27, 1978 <br /> the waste, four_feet of cover should be required. This will <br /> act as a sponge and-ba-wrier for infiltration, and provide a <br /> zone for proper root development. If ponding does occur as <br /> a result of settlement, there should be enough cover material <br /> available on site to correct the problem by regrading . <br /> 2) This alternative involves increasing the slope to two percent <br /> and reducing the cover requirement to three feet. Revegetation <br /> of completed areas should begin immediately to stabilize the <br /> slopes. The increased slopes will provide for lateral runoff; <br /> however, this may result in erosion problems. Interior drains <br /> may also be necessary to mitigate the problem. <br /> Because we are not intimately familiar with the engineering properties of <br /> the soils in the area, we suggest the local Soil Conservation Service Office <br /> be contacted to further analyze the situation. Inquiries should be directed to: <br /> Mr. Kirby McClellan <br /> Soil Conservation Service <br /> 1313 W. Robinhood Drive, Suite #8 <br /> Stockton, CA 95207 <br /> Phone: 946-6229 <br /> Mr. McClellan has indicated the Soil Conservation Service could analyze the <br /> erosion potential for the various configurations proposed. <br /> We realize the slopes we have proposed may not be entirely compatible with <br /> dry farming. Therefore, we suggest alternative uses be investigated such <br /> as grazing or recreational use. <br /> You also requested additional information on closure requirements . Enclosed, <br /> as an example, are the requirements recently adopted by the San Francisco <br /> Bay Regional Water Quality Control Board. We understand those requirements <br /> are being considered for state::ide adoption. <br /> A member of my- staff will be contacting you in the near future about soil <br /> requirements for crops. Other grading solutions for the final grading plan <br /> are possible. My staff will be happy to discuss these with you. Please <br /> contact Kim Wilhelm for further details at (916) 322-7364. <br /> Sincerely, <br /> Herbert Iwahiro, Chief <br /> Local Assistance and Planning Division <br /> Enclosure <br /> cc: Mr. William Johnson, Central Valley Regional Water Quality Control Board <br /> Mr. William Cypher, Maintenance Supervisor <br /> Mr. Ronald Valinoti , San Joaquin Local Health District <br />