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CALIFORNIA% A k REGIONAL W) CENTRAL VALLEY REGION 3443 R Road, Suit® A Sacramento, CA 95827-3098 PHONE: (916) 255-3000 FAX: (916) 255-3015 VIII1110 14 1 WAVU z I Mej 4:16110 V City of Stockton Department of Public Works City Hall, 425 orth El Dorado St Stockton, CA 95202 -4997 We have reviewed your plan for control of leachate seepage at the landfill described in your 13 May 1996 letter to Mr. Steve Mindt at the San Joaquin County Public Health Services. We conducted inspections of the leachate seepage area on 9 May 1996, and on 18 June 1996. In both cases there was no doubt that leachate was surfacing. The ground in the area was very saturated, however no distinct flow was evident. While we have no problems with your current procedures for controlling the leachate seepage during this part of the year, our concerns are for the rainy season and whether or not you will be able to contain the leachate in the area during heavy rainfall. The City should develop a specific strategy describing how leachate generated during the wet season will be managed to prevent any flows off-site or into the storm water retention basin. Additionally, we recommend that a site assessment be ated to determine the source of the leachate. Based on your findings, a proposal for corrective action should be submitted for our review. Your proposal to transport the leachate to the City's treatment plant for disposal is acceptable. As per your recent telephone conversation with Arnie Inouye of my staff, we are awaiting your submittal of the sampling results on the leachate in compliance with the waste discharge requirements. I I "1 11 1 1111 111 TJT,7�- Mi I I � � I I 111111� 1 6 - , W77, MINITIFT1111! 7110 . �rj T -MI -1 �11 WILLIAM J. MARSHALL, Chief Waste Discharge to Land Unit W] Ms. Mary Coyle, Integrated Waste Management Board, Sacramento Mr. Steve Mindt, San Joaquin County Public Health Services, Env. Health Div., Stockton