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STATE OF CAUFORNIA PETE WILSON-;Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD �� <br /> CENTRAL VALLEY REGION <br /> 3443 Routier Road,Suite A ° <br /> Sacramento, CA 95827-3098 ,�R <br /> PHONE: (916)361-5600 <br /> FAX (916)361-5686 <br /> Y 3 <br /> 25 September 1992 !% ' <br /> ENVIRONMENTAL NLTI-i <br /> PERMr. Gabe Karam IT� � . <br /> 1810 East Hazelton Avenue <br /> Department of Public Works <br /> San Joaquin County <br /> Stockton, CA 95201 <br /> LEACHATE DISPOSAL PLAN, NORTH COUNTY SANITARY LANDFILL, SAN JOAQUIN COUNTY <br /> We have reviewed your 11 August 1992 report, "Long Term Surface Runoff and <br /> Leachate Disposal Plan." The Plan states that during wet weather periods the <br /> leachate will be filtered to remove contaminants and the filtered water will <br /> be discharged to the next module where no wastes have been discharged. During <br /> dry weather, leachate will be sprayed on the landfill currently receiving <br /> waste. No leachate treatment is proposed during the dry weather season. <br /> Our concerns about this Plan are as follows: <br /> 1. Leachate must be removed from the sump as it accumulates in order to <br /> comply with Waste Discharge Requirements Order No. 89-199, Discharge <br /> Specification B.8. The Plan states that leachate will be sprayed over <br /> the lined portion of the landfill during dry weather periods. More <br /> details about the spray program are needed. Leachate may be sprayed on <br /> the roads within the unit for dust control or on the landfill for dust <br /> control . However, leachate may not be applied in sufficient quantities <br /> to percolate downward into cover soils. These restrictions should be <br /> stated in the Plan. <br /> 2. During dry weather months, there will likely be periods of time when <br /> dust control water is not needed. Where will the leachate be stored <br /> until dust control liquid is needed? r <br /> -3. The berm around the winter pad must be designed to direct water to the <br /> leachate collection system under all rainfall conditions. If the berm <br /> fails and:allows leachate to commingle with runoff from outside the <br /> bermed area, then all runoff inside the module must be handled as <br /> i <br /> leachate. <br /> a 4. The Plan states that surface runoff inside the module and outside of the <br /> winter berm wi l be stored in the Surface Runoff Storage Basin. The <br /> Phan does not indicate that surface runoff will beup roped from the <br /> active module to `storage in a future module. Surface runoff must not be <br /> contaminated with leachate from either the winter pad or from contact <br /> with,wastes previously discharged to the active module. We are <br /> concerned that.wastes outside of the winter pad area may be contacted by <br />