2016-08-29_PERMIT FILE - C1981035A (3)

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COLORA DODEPARTMENTOFPUAUCHE .lLTRANDENl=NAdLNT. WatorQadiryControlDtKdM Rattan k Page S. COG -OSOOM Sand and Gravy/ General Permit 1. p.,.! — This parameter is limited by Water Quality Standards as the water quality standards of 6 5 -9.0 s.u. range are more stringent than those specified under the BM&jdm for Effluent Limitations. 2. Selenium —The permit writer will review the application and determine if selenium must be limited and/or monitored to protect Me classified uses assigned to the receiving water. If required, the permit writer will set these limitations equal to the appropriate water - quality standards. Selenium will be considered a pollutant of concern for facilities operating in areas of shale deposits containing selenium (e g. Mancos). 3. 1 he permit writer wilf review the application and determine if metals parameters must be limited and/or monitored to protect the classified uses assigned to the receiving water. If required the permit writer will set these limitations equal to the appropriate water - quality standards As many water quality standards for metals are listed as TYS, and based upon an equation dependent on the hardness of the receiving strewn, the permit writer wilt obtain hardness data to•determine the appropriate metals limitations where appropriate. 4. Q= £-- The permit writer will review the application and determine if arty organic parameters must be limited and/or monitored to protect the classified uses assigned to the receiving water. If required the pamit writer will set these limitations equal to the appropriate water quaftly standards. S. 71te addition of hemicals (including release agents) to the discharge is not alimed unless ewressly authorised by the Division. A release agent is a substance used to aid in the separation of the desired material from the substrate, and must be disclosed. To approve a chemical, the Division must have the associated MSDS sheets) provided with the application. If authorized all chemicals must be used and stored in accordance with the mamifacturers' recommendations and in accordance with any applicable state or federal regulation. d Sal ity Requirements — All permit actions for discharges to surface waters in the Colorado River Basin must include salinity monitoring Accordingly, the permit writer will perform an analysis, as set out in the paragraphs that follow, to determine which salinity requtroments apply pwsuant to the requirements of Section 61.8(2 }(l) of the Colorado Discharge Permit &km ReStlattons(RcVjjg ion No 61). Multiple discharges coveredfrom a single facility are subject to the limitation that would apply if there were a single discharge point Based on the effluent data in the application from a new facility, the permit writer will make an assessment of the c9micted salinity load in the discharge (from concurrent flows at all outfalls) and if less than 1 tonlday or 366 tonsfyear, the calculation will be documented in the issued cati cation. For facdales discharging less than this threshold quarterly monitoring will be required, as existed in theprevious permit For facilities that exceed the 1 ton/day or 366 tons6v4r threshold, a MS limitation will be applied in the permit, unless the perminee demonstrates that it is not practicable to prevent the discharge of all salt. The Division will decide on this exception prior to the start of discharge and may require further actions by the permidee to reduce the salt load before approval of the discharge. In conformance with section 61.8(2 }(1) {i)(.4) of the Colorado Discharge Permit &M &e jdMgM the permittee must submit a report that documents whether it is feasible to treat to these levels. The Salinity Regulations allow for a waiver of 7ZDS limitations upon submittal of a report that demonstrates that achievement of zero salt loading or, in the event that is not achievable, discharge of less than one ton per day, is not economically feasible. There is no r+ecaord that the permittee has previously submitted this report If a report has previously been submitted, the permutes should submit a copy of this report Quarterly monitoringfor total dissolved solids will continue regardless. In conformance with the Colorado Discharge Permit&Wm Remdation Mmdatton No. 611 existingpermus for discharges to the Colorado River basin incorporate total dissolved solids (7W)as the monitoring parameterfor compliance with the salinity requirements. Electrical conductivity (EC) may be substituted for TDS if a constant correlation exists between IDS and EC is established for the discharge, based on S paired samples, and approved by the permit writer: a P gDis Repro— Additional limitations forphosphorus may apply to discharges to surface waters in four watersheds — Ddlon Reservoir, Cherry Creek Reserwir, Chatfield Reservoir, and Bear Creek Reservoir. Wasteloads (eg., phosphorus) have been allocated in these regulations to various point and non point sources that discharge on these watersheds. 0a discharge is to one of these areas, as defined in Regulations 71, 72, 73, and 74, the permittee will be required to obtain a wasteload allocation from the appropriate authority prior to certification under this general permit f jaditradaaw — As set out in 7he Basic Standards and MelhodologjtofSurface >T'ater Section 31.8(3)(c)(ii)(C), an anddegradadon analysis is required for all waters not designated as Use Protected except in cases where the regulated activity will result in only temporary or short term changes in water quality, or where the ratio of the low flow to the facility flow is 100:1 or more. Discharges permitted under this general permit are not normally temporary or short -term, thus, these discharges are not