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Ion Exchange Water Treatment System Design <br />WRT has provided descriptions, specifications, and engineering drawings detailing installation, <br />function, operation, and media disposal services for the nominal 100-gpln water treatment <br />system that will be located in the WWTB. This information is submitted as Attachment 2 to this <br />document. <br />Water Treatment Monitoring <br />The monitoring schedule for sampling of water treatment discharge is generally expected to be <br />similar to the Permit. The previous discharge sampling schedule and analytical parameters are <br />shown in the following table. Because historic and recent water quality data from Sump Number <br />One indicates that uranium is the only constituent requiring treatment to meet water quality <br />standards in Ralston Creek, Cotter proposes modifying daily discharge sampling and analysis <br />requirements for radium 226+228 to weekly composites to be collected with the weekly uranium <br />sainple. Daily sampling and analysis for this parameter would be excessive and unnecessary. <br />Rffluent Permeter <br />Flow, MGD Fregp e3 nCp <br />Continuous R^amot?e <br />Recorder <br />COD, mg/I Onc e p er month Composite <br />T otal Suspended S olids (TSS), mg/1 Onc e p er month Composite <br />Uranium, PD, ug/l Weeldy Composite <br />Radium226+228 (total), pCill a/ Daily Composite <br />pH, s.u. (minimum-maximum) Daily Grab <br />Oil andGrease, mg/1 Daily Visual bt <br />Antimony, Tl, ugf I One e p er m onth Composite <br />B oron, mg/l One a p or m onth Composite <br />Chromium, TR, ug/I Onc e p er month Composite <br />Copper, PD, ug/1 Onca permonth Composite <br />Silver, PD, ug/l Onc e p er m onth Composite <br />Zinc, PD, ug/1 Once per month Composite <br />Cyanide, WAD, ug/1 Onc e p or month Grab <br />Fluoride, mg/l One e p er m onth Composite <br />Thallium, TR, ug/1 Onc e p er in onth Composite <br />whole Effluent Toxicity, Chronic Lethality <br />Ceriodephniaspecies Semi-annually 3Composite sperTest <br />F athead Minnow (Pimephales promelas) Annually (First halfofyew) 3 Compo site s p er T act <br />Cotter understands that the new discharge limit for uranium is 0.03 mg/1(versus the Permit value <br />of 0.776 mg/1). Discharge limits for other water quality parameters are still pending WQCD <br />evaluation, but are expected to be assigned by July 31, 2010. As part of evaluation and <br />assignment of new discharge limits, Cotter requests that the WQCD accept water hardness data <br />for Ralston Creek adjacent to the site and a corresponding evaluation as provided by Whetstone <br />Associates in Attachment 3.