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STATE OF CALIFORNIA • PETE WILSON, Governor <br /> CALIFORNIA REGIONAL WATER OUALIIY CONTROL BOARD <br /> CENTRAL ROOAL VALLEY REGION L <br /> 344 <br /> 3443 UTIER ROAD, SUITE A <br /> Sacramento, CA 95827-3098 <br /> PHONE: (916) 361-5600 h I_)�( 2 '��� <br /> FAX: (916) 361-5686 <br /> f-WIRONMENTAL HEALTH <br /> 19 June 1992 <br /> Mr. Pat Mickelson, Operations Manager <br /> Simpson Payor Company <br /> 942 South Stockton Ave <br /> Ripon, CA 95366 <br /> SIMPSON PAPER COMPANY, RIPON MILL - SAN JOAQUIN COUNTY <br /> We have reviewed the report titled "Impacts on Receiving Waters from Discharge <br /> at the Simpson Paper Company Facility, Ripon, California" dated 5 May 1992. <br /> This report indicates that the discharge from Simpson Paper will continue to <br /> degrade ground water quality in the future. As a result we must classify the <br /> waste water discharge from Simpson as a designated waste. <br /> In previous correspondence we had asked Simpson to establish a level of salt <br /> discharge, below which its waste would not be a "designated waste" as defined <br /> in Title 23, Division 3, Chapter 15 (Chapter 15) of the California Code of <br /> Regulations. Our letter of 31 October 1991 stated that "Simpson must <br /> demonstrate that its waste water discharge, below some particular TDS level , <br /> will not be released into the semi-perched ground water at a level which would <br /> cause ground water concentrations to exceed applicable water quality <br /> objectives or which could cause degradation of waters of the State. Since the <br /> Simpson discharge is already above applicable water quality objectives, it is <br /> necessary for Simpson to demonstrate that the discharge will not cause <br /> degradation of ground water at the Ripon Mill site. This demonstration must <br /> involve diffusion of Mill effluent into site ground waters as well as the rate <br /> of flow of ground water across the site and the quality of ground waters <br /> entering the site. A technical Report addressing the above concerns must be <br /> submitted to our office by 1 February 1991. " <br /> Your letter of 23 January 1992 indicated that "We understand that your Agency <br /> has requested a numerical limit for the TDS discharge, either on a <br /> concentration basis (mg/1 ) or a mass basis (kg/day) , or both. This value will <br /> be forthcoming following completion of the report by Lawrence & Associates. " <br /> Ms. Katy Harrison of Lawrence and Associates met with Regional Board staff on <br /> 17 March 1992 to discuss the ground water modeling proposal . In a followup <br /> letter she stated "Bottom line: 1) address whether or not Simpson Paper Co is <br />