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COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division <br />Rnlionale -Page 5. Permit No. CO-0038024 <br />Oil & Grease, mg/F 6/4/9 10 0 <br />Tota! Dissolved Solids, <br />mg/P 5005/4660/5484 - - <br />ton/day mean = 4.02 1 * <br />Whole Ejjluem Toxicity, Acute Pass = S see permit 3 <br />Fai! = 3 <br />Save ua.nY Rgdado,u Smlf ralidry duaMrta fo awe fan oe day ar JJO lawf pc year, iee ur6a Y.8 D4auflan of <br />Canplianae <br />The Pnmlaee indimed 30day avt oJ36 aid dally ~ gJ78 an ane DNR, that d,ae rriahr ass qurrYauble <br />7SS, mg/[ <br />30~ay avg <br />daily fnax <br />3441lL3+/5585 24/16/35 <br />4982/36*/11,060 33/24/46 <br />Flow, MGD <br />30-day avg - 0.002/0.001/0.002 <br />daily max - 0.002/0.002/0.003 <br />Pemuaae rcponed lame wJun for bash 4ylaenl and ~laeN an Ifh yP 9r DAlR <br />2. State SamDlinr: There are no recent state sampling results available jot this facility. <br />B. Compliance Wish Terms and Conditions ojPrevious Pernti! <br />Ellluent Limitations: The data shown in the preceding tables indicate chat the Western Fuels -Utah, Inc. <br />facility has maintained compliance with the previous permit, with the exception of one total iron exceedence ar <br />ourfall 004, three acute ceriodaphnia WET test failures at outfall 024 and one oil & grease exceedencc and <br />tx+o acute WET test failures at outfall 026 <br />The oi[ & grease exceedence appears isolated - it was caused by an equipment break that was quickly <br />repaired. The iron esceedence appears to have becn an isolated incident, akhough no discharge has been <br />reported since the excetdence. <br />The permiaee suspects that TDS is the cause of WET failures and is working on confirmation. Several months <br />ago, they sent their WET testing data Jo EPA's national laboratory for assistance in pinpointing the cause. <br />There has been no reply yet from EPA. If no answer from EPA rs forthcoming, the permittee needs to pursue <br />other avenues to detmnine the cause. At the Division's direction, the permittee is preparing a study of the <br />actual impairmem to aquatic life as a resub of the toxicity of their discharges. Once the study has been <br />reviewed, limitations jot the parameter causing tonicity may be added to the permit if not already existing. <br />The permittee has recently stated that the TDS concentrations seem to correlate with mining activity, 7DS <br />levels are much higher when active mining is ongoing. When mining in one area recently ceased, TDS levels <br />in that area dropped. <br />2. Other Permit Reouirements: The permittee has been in apparent compliance with all other terms and <br />conditions of the permit. <br />BOD„ mg/[ <br />30~ay avg 442/194/>845 20/4/34 <br />daily max 596/253/> 849 36/5/63 <br />