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been halted. When water is again discharged through NPDES 008, which we expect to <br />occur sometime during the latter portion of the 2nd Qtr of 2002, we will innned_ lately <br />resume the accelerated WET testing. <br />2) Requested W;E.T., lnc. to send samples ofthe failed test waters to our analytical <br />testing lab, ACZ of Stevnboat'Springs so that they can run a metal suite with'a low <br />detection threshold ofabouf5ppb. Metals include As, Cd, Cr, P6, Ni; Ag, Zn, Na, and <br />K. <br />3) Requested W.E.T., Inc. to conduct bench top, aeration tests -on. the. first <br />accelerated sample collected 2 Jan 2002. Separate batches of water were. aerated for _ <br />four (4) hours and twenty (20) hours before a Ce_ riodaphnia WET test' Results°show <br />both aeration periods produced no mortality in 100%`afrer.48 liours. Mr: Rawlings <br />believes,that,opr [rpuble may arise because what we are discharging is transitioiiitig <br />from agcoimdwater to surface water stability state. He also stated that fhe high TDS <br />values may exacerbate-[he 'stress that Ceriodaphnia undergo during the stability <br />transition phase: He has drafted a summary memo based on WPG's comments, and the <br />results of botli the.failed \VET tests and his bench top testing. A copy`of his memo is <br />attached to this letfer as Appendix A <br />4) Start in-house design work of simple modification methods based onincreasing <br />surface residence time and /, or aeration of water fo be discharged from NPDES 008, <br />whenever ifis te9c[ivated. <br />5), Conduct additional testing, design, etc as results and conditions warrant <br />~Thistswhatwecurrentlyknowaiid_howweintendfoproceed'forthenext§everalmoitths, WFC <br />will keep you informed as to our p"rogress. As`always,'siibsegtient findirigs may modify or ' <br />invalidate the steps listed above.- <br />Meeting the State compliance standards is very important to WPC, and as such, we will find an <br />answer to the problem of the lailed NPDES 008 WGT tests. <br />Sincerely,., - <br />"foray dins <br />ivline igineer <br />2 c. <br />