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COLORADO DEPARTiNENI OF PUBLlC HEALTH AND ENVIRONMEM, Water Qewliry Control Division <br />Rationale ~ Page 6, Permit Na. CO-0045161 <br />Tr,~hle !y 2-Treahnent and Outfa![ Data (continued <br />Outfall <br /> <br />~lYrtirtber.~ Wastewater Source . <br /> <br />~ ~ 30 Day Avg <br /> <br />Flow, MGD ~ ~ .Daily Max Flow, . <br /> <br />MGDt ~ 10.Yr, 3~Hr. ' ~ . <br />i <br />Capacil , MGl; Pond <br /> <br />Volume, MG'..: <br />0096 pit pumpage to 009a ' ' N/A t <br />OIOa surface runoff irtterminent 0.52 2.44 1.98 <br />0106 it um a e to 0/Oa s r N/A N/A <br />1. Dairy Max Flow, MGD - defrrsed as the maximum dairy outflow derived from DMRs between April 1, 1997 through September 30, 1998. <br />2. 10-18, 24-HR Capacity, MG -defined as the equivalent runoff volume used in designing the treatmem rystem. <br />3. Pond Volume, MG - defrned as the rysrem's actual volume, escluding solids retention and cvp~ "permaneru pool " <br />Measured from the elevation of the lowest perforatiors [o the elevation of the emergency spillway. <br />4. Ourfall 008a will receive a small volume of flow from naturally occrvring springs ra+aed to the under drain rystem installed as part of the <br />West Pit Fifl canstructiars. Flowt should be less dtart 7 gpm <br />S. Because these are new internal outfafls na flow or pond data are available yet. <br />NOTE:.4f1 ponds will be managed as 'treatment" ponds. A 'treatment' pond rs one which retaim sedimeu and wmer for a calculated <br />duration. to ensure the discharge standards for total suspended solids and settleable tolyds arc achieved. Ilu Daily Max Flow, 10-yr, 24-hr <br />Capacity, and Pond Vobune column figures reflect Colowyo's new pond design calculations dated November 17, 7998. <br />Pursuant to the authority of Article 9, Title 25, emulations for the Certification gj'Water Treatment Plant and <br />Wncrewater Treatment Plant Operators. this facility may require a certified industrial operator. The permittee <br />currently employs one person with a Class D wastewater operator certification. The permittee should contact the <br />Colorado Plant Operators Certification Board at (303) 692-3550 if further information is desired. <br />V. PERFORMANCE HISTORY <br />A. Monitoring Data <br />1. Discharge Monitoring Reports: Tables V-1 tFtrough V-9 summarize the effluent data reported on the quarterly <br />Discharge Monitoring Reports (DMR's) for the Colowyo facility from July 1997 through September 1998 for <br />OutfalLs 001, 002, 003, 004, 005, 007, 008, 009 and 010. The permittee reported "no discharge" during this <br />period for ouflflal! 006. <br />Table V-1 - <br />Results <br />,.,..: . <br />,.,. .. <br />,... No: Of <br />:. . <br />. <br /> <br />geporfeii..: :. <br /> <br />Previous:;:.:.. <br /> <br />1Vo..of, .:. <br /> <br />;.. eportng :..::: :. <br />R <br />,. <br />'.'.::.:.:.:Cor%centrgtibns:,:':.:. <br />.:: ,:aPe{•mit .' <br />'.lirriitatioit <br />;. <br />,. .. .. <br />Pararitetei :..:.. ':.:: Periods .' .; ::: <br /> <br />.:::.:.':rive/MutlMar: .. <br />,. <br />...: Z;irnitatimt : <br /> <br />. :Excursions:.. <br />Flow MGD <br />~~~vg <br />TSS, mg/P <br />30-day avg . <br />daily max <br />Oil & Grease, mg/P <br />Settleable Solids, mP/P <br />TDS, mg/P <br />Total Iron, mg/P <br />5 0.186/0.148/0.229 none <br />5 0.314/0.148/0.593 none <br />4 15/10/23 35 <br />4 31/20/48 70 <br />2 NV/NV/NV 10 <br />S -/7.4/8.5 6.5-9.0 <br />5 0.3/<0.1/<0.5 0.5 <br />S 2624/2240/2900 none <br />0 <br />0 <br />0 <br />0 <br />0 <br />NV means no visible sheen observed <br />