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COLORADO DEPARTMENCOF PUBlJCHEILINAND .EIW/RON.tlEM; Waver QuaRq Contro(Division Radonate -Page 4. Permit No. COG-500000 b. Salinity, or Toeal Dissolved Solids (TDS) it an issue in the Colorado River Basin. Regulation 39, Regulations fi Implementation ofthe Colorado River Salinity Standards through the Colorado Discharge PermitProgram, "addresses tl discharge ojTOS to the Colorado River Basin. The regulation requires that the salinity ojeach discharge to the Colorac River Basin be evaluated for impact on the system. TDS will be included in the monitoring jor dischargers in the Colorado River Basin, however, limits will not be impose The Division does reserve the right to impose limits on permittees if the TDS levels are determined to be detrimenea[ t endanger the beneficial uses ojehe waters. ljTDS monitoring is a requirement ojthepermit ehen itshall be included with: the terms and conditions of the individual Certification Rationale of the permit. Additional monitoring jor TDSshall l included on the Discharge Monitoring Reports (DMR) and shall be subject to the permit's monitoring and reporti~ requirements. TDS sampling shaft be on a quarterly basis, taken as a grab sample. Where, based on a minimum oj5 samples, the permi[tee demonstrates to the satisfacrion of the Water Quality Contra Division that the level ofTOS in the effluent can be calculated based upon the level of electrical conductivity, the permitu may measure and report TDS in terms of electrical rnnducttvity. c. Phosphorus: Due to the effects ofnutrient loading in drinking water storage reservoirs, (algae blooms, taste and adt problems, oxygen depletion) various phosphorus regulations have been developed to track the loading in the affect basins. Therefore, total phosphorus (as P) monitoring is reguiredforfacilities which dischargeprocess water into tl following drainage basins: Cherry Creek basin, Chatfield Reservoir basin downstream ojthe USGSgage at Watertc and on Plum Creek, Dillon Reservoir basin (i.e. Ten Mile Creek Snake River, Blue River, all tributaries to the Dillc Reservoir), and Bear Creek basin. The Diw:sion also reserves the right to include phosphorus monitoring jor at receiving waters that may later enter into phosphorus monitoring requirements, orforfacilities that use phosphon chemica&jor treatment Ijphosphorus monitoring is a requirement ojthe permit then itshall be included within tl terms and conditions of the individual Certification Rationale of the permit. Additional monitoring for phosphon steal! be included on the (DMR) and shall be subject to the permit's monitoring and reporting requirement Phosphorus sampling shall be on a monthly basis, taken as a grab sample. d. Graphite: In the case ofgraphite mining, thejederal effluent guidelines (40 CFR 436.382) call for a limit jor Tot, Iran. Since the Division has Water Quality Standards m many areas of the state, which may be stricter than tJ federal limits, coverage of process water dischatgesfrom this type offacility must be under an individual permit. B. Stormwater Discharees Stormwater vs. Process water When stormwater mixes with process water, the process water limitations (Part I.B ojthe permit) apply to the discharge that mixed water. The stormwater section (Part I.C of the permit) tr intended to cover [hose portions ofa nonmetal! minerals production operation (except fuel) that are not already subject to effluent limitations under 40 CFR 436, and cover stormwater runofffrom asphalt and concrete batch plants. 1. StormwaterManaeemenl Plan (SWMP/ The stonnwater regulations primarily apply to areas not covered by 40 CFR Part 436. They require perminees to deveh and implement a Stormwater Management Plan (SWMP) to protect the quality ojstormwater leaving the site. The ply shall identify potential sources ojpo!lutian (including sediment) which may reasonably be expected to affect the quality stormwaterdischasges associated with mining activity. In addition, the plan shall describe the best management practic (BMPs) which will be used to reduce the pollutants in stormwater discharges from the mining site. Some activities required under the SWMP may already be in place. However, the SWMP will require the permittee coordinate these activities with any necessary new activities to an orderly manner, so that the result is the reduction eliminationojpollutantsreachingstatewatersfromareasnot/imitedbyefjluen[Iimitations. Facilities mustimplementt, provisions of the SWMP required under thrs pan as a condition of this permit. It is the permittee's respoxsibility to notify the Colorado Divisiox ofMinerals and Geology (formerly the Colorado Min. Land Reclamation Division)ofanysign~cantchangesattheirsiteresultingfromtheimplementationojtheSWMP. T4iis so shat the Division of Minerals and Geology may review the SWMP and incorpora[e any potential revisions into t. facility's reclamation permit which might be needed. The SWMP shall include the following items, at a minimum: