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c JOAQUIN THOMAS R.FLINN <br /> DEPARTMENT OF PUBLIC WORKS OEPUTYDIRECTOfl <br /> •�' `p• P.O.BOX 1810-1810 E.HAZELTON AVENUE <br /> ciFSa� STOCKTON,CALIFORNIA 95201 THOMAS M.GAU <br /> MANUEL LOPEZFAX 9)4 -3 2999 DEPUTY DIRECTOR <br /> DIRECTOR <br /> n STEVEN WINKLER <br /> May 8,2001 DEPUTY DIRECTOR <br /> Wendy Arano <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 3443 Routier Road <br /> Sacramento, California 95827 <br /> SUBJECT: COMMENTS TO TENTATIVE WASTE DISCHARGE REQUIREMENTS FOR <br /> CORRAL HOLLOW SANITARY LANDFILL <br /> Dear Ms. Arano: <br /> This letter represents San Joaquin County's responses to the Tentative Waste Discharge Requirements for <br /> the Corral Hollow Sanitary Landfill dated April 16,2001. The County has two comments. First,the <br /> County requests that the cations/anions that have been added to quarterly monitoring(carbonate, <br /> bicarbonate, calcium,magnesium,potassium, and sodium),be changed to annual monitoring. <br /> The County also requests the removal of finding 19,requiring the monitoring of groundwater in the <br /> Southwestern half of the landfill. The enclosed maps show that the historic groundwater flow direction is <br /> north by northeast, and thus the southwestern half of the landfill would be considered up gradient. Also, <br /> wells in this location would probably need to be at least 400 feet deep. The recent installation of the landfill <br /> gas control system has shown that the waste in the landfill is very dry. Several times the bottom of the <br /> landfill was encountered while drilling the gas wells, and leachate was not encountered. The operation of <br /> the gas system will also remove moisture from the waste. Thus the chances that leachate could be affecting <br /> this very deep aquifer are very small. <br /> These comments are being made as a result of our meeting on May 1, 2001. If you have any questions, <br /> please contact me at(209)468-3066. <br /> Sincerely, <br /> MICHAEL KALISH <br /> Associate Engineer <br /> MK:vn <br /> N:\Michur CH\GWmon\wdr_comments.wpd <br /> Attachments <br /> d: Robert McClellon, Lead Senior R.E.H.S., Environmental Health Division,Public Health Services <br /> LA 64201 <br />