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COLORADO DEPARTMEM OF PUBLlC HEALTH AND £Nl?RONMEM; Watn Quality Comrol Division Ratiomle -Page 4. Permit No. COGSOQ'~00 -, b. Salinirv, or Total Dissolved Solids (TDS) is an issue in the Colorado River Basin. Regulation 39, "Regulations for Implementation ofthe Colorado River Salinirv Standards through the Colorado Discharge Permit Program, "addresses t1.; discharge oJTDS to the Colorado River Basin. The regultion requires that the salinity ofeach discharge to the Colorado River Basin be evaluated jot impact on the system. TDS will be included in the monitoring for dischargers in the Colorado River Basin, however, limits will not be imposed. The Division does reserve the right to impose limits on permittees if the TDS Levels are determined to be detrimental or endanger the beneficial uses ofthe waters. IfTDS monitoring is a requirement of the permit then it shall be included within the terms and conditions of the individual Certification Rationale of the permit. Additional monitoring for TDS shall be included on the Discharge Monitoring Reporu (DMR) and shall be subject to the permit's monitoring and reporting requirements. TDS sampling shall be on a quarterly basis, taken as a grab sample. Where, based on a minimum of 5 samples, she permittee demonstrates to the satisfaction of the Water Quality Control Division that the level oJTDS in the effluent can be calculated based upon the level oJelectrical conductivity, the permittee may measure and report TDS in terms of electrical conductivity. c. Phosphorus: Due to the effects of nutrient loading in drinking water storage reservoirs, (algae blooms, taste and odor problems, oxygen depletion) various phosphorus regulations have been developed to track the loading in the affected basins. Therefore, total phosphorus (as P) monitoring is required for facilities which dischargeprocess wafer into the following drainage basins: Cherry Creek basin, Chatfield Reservoir basin downstream ojthe USGSgage at Waterton andon Plum Creek, Dillon Reservoir basin (i.e. Ten Mile Creek, Snake River, Blue River, all tributaries to the Dillon Reservoir), and Bear Creek basin. The Division also reserves the right to include phosphorus monitoring for any receiving waters that may later enter into phosphorus monitoring requiremenu, orforjacilities that usephosphorus chemicals for treatment. If phosphorus monitoring is a requirement of the permit then it shall be included within the terms and conditions of the individual Certification Rationale ojthe permit. Additional monitoring for phosphorus shall be included on the (DMR) and shall be subject to the permit's monitoring and reporting requiremenu. Phosphorus sampling shall be on a monthly basis, taken as a grab sample. d. Graphite: In the case ofgraphite mining, the federal effluent guidelines (40 CFR 436.381) call for a limit for Total Iron. Since the Division has Water Quality Standards in many areas of the state, which may be stricter than the federal Iimits, coverage ofprocess water discharges from this type of facility must be under an individual permit. $. Stormwater Discharges 1. Stormwater vs. Process water When stormwater mixes with process water, the process water limitations (Part I B of the permit) apply to the discharge of that mired water The stormwater section (Part I C of the permit) is intended to cover those porrions of a nonmetallic minerals production operation (except fuel) that are not already subject to eJfluerst limitations under 40 CFR 436, and to coverstormwater runofffrom asphalt and concrete batch plants. 2. Stormwater Management Plan (SWMP) The stormwater regulations primarily apply to areas not covered by 40 CFR Part 436. They require permittees to develop and implement a Stormwater Management Plan (SWMP) to protect the quality ofstormwater leaving the site. The plan shall identify potential sources ofpo[lution (including sediment) which may reasonably be expected to affect the quality of stormwater discharges associated with mining activity. In addition, the plan shall describe the best management practices (BMPsJ 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 perrnittee to coordinate these activities with any necessary new activities in an orderly manner, so that the result is the reduction or elimination ofpollutants reaching state waters from areas nor limited by effluent limitations. Facilities must implement the provisions of the SWMP required under this part as a condition of this permit. It is the perminee's responsibility to notify the Colorado Division oJMtnerals and Geology (formerly the Colorado Mined LandReclamadonDivision)ofanysignificanlchangesattheirsiteresalAngfromtheimplementationoftheSWMP. This is so that the Division of Minerals and Geology may review the SWMP and incorporate any potential revisions into the facility's reclamation permi[ which might be needed. The SWMP shall include the following items, at a minimum: