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Ahk California Regional Water Quality Control Board Central Valley Region Robert Schneider,Chair Winston H.Hickox -Gray Davis Secretary for Sacramento Main Office Governor Environmental Internet Address: http://www.swrcb.ca.gov/rwgcb5 Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 Phone(916)255-3000•FAX(916)255-3015 15 May 2001 Mr. Michael Kalish County of San Joaquin Department of Public Works P.O. Box 1810 Stockton, CA 95201 PROPOSED REVISIONS TO WASTE DISCHARGE REQUIREMENTS, CORRAL HOLLOW SANITAR Y LANDFILL, SAN JOA Q UIN CO UNTY(Case No. 1896) The Regional Board has received your letter dated 8 May 2001 with your comments regarding the Tentative Waste Discharge Requirements (WDRs) for the Corral Hollow Sanitary Landfill. The proposed revisions to the WDRs in response to your letter are included in the attached redline strike- through WDRs and the associated Monitoring and Reporting Program(MRP). I will first address the two specific comments in your letter. Both of the following comments (the County's comments are typed in italics and the Regional Board responses follow)were also discussed to some extent during our meeting on 1 May 2001. 1. "First, the County requests that the cations/anions that have been added to quarterly monitoring(carbonate, bicarbonate, calcium, magnesium,potassium, and sodium), be changed to annual monitoring. " Table I of the MRP will be revised in accordance with this comment. The Stiff diagram and Piper graphs mentioned under section D 1 of the MRP would accordingly be prepared annually also. 2. "The County also requests the removal of finding 19, requiring the monitoring of groundwater in the southwestern half of the landfill. The enclosed maps show that the historic groundwater flow direction is north by northeast, and thus the southwestern half of the landfill would be considered up gradient. Also, the gas control system has shown that the waste in the landfill is very dry. Several times the bottom of the landfill was encountered while drilling the gas wells, and leachate was not encountered. The operation of the gas system will also remove moisture from the waste. Thus the chances that leachate could be affecting this very deep aquifer are very small. " Finding 19 has not been removed,but has been reworded for clarity. The shallow groundwater present at the northeastern edge of the landfill is apparently not laterally extensive. Therefore, more than half the landfill is not underlain by the shallow groundwater and the deeper flow zone is the first encountered California Environmental Protection Agency 0 Recycled Paper The energy challenge facing California is real. Every Californian needs to take immediate action to reduce energy consumption. For a list of simple ways you can reduce demand and cut your energy costs,see our Web-site at http://www.swrcb.ca.gov/rwgcb5