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Rarionde -Page 4. Permit No. COGSO0~7W ~~• ', b. Salinity, or Total Dissolved Solids (TDS) is an issue in the Colorado River Basin. Regulation 39, 'Regulations for Implementation ofthe Colorado River Salinity Standards through the Colorado Discharge Permit Program, "addresses r1.L discharge of TDS to the Colorado River Basin. The regulation requires that the salinity ojeach 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 limiu on permittees if the TDS levels are determined to be detrimental or endanger the beneficial uses ofthe waters. If TDS monitoring is a requirement ojthe 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, the permittee demonstrates to the satisfaction of the Water Quality Control Division that the level ofTDS in the effluent can be calculated based upon the level of electrical conductivity, the perminee may measure and report TDS in terms ojelectrical conductivity. Phosphorus: Due to the effects ofnutrient loading in drinking waterstorage reservoirs, (algae bloo»ts, taste and odor problems, oxygen depletion) various phosphorus regulations have been developed to track the loading in the affected basins. Therefore,totalphosphorus(asP)monitoringisrequiredforfaci[itieswhichdischargeprocesswaterintothe following drainage basins: Cherry Creek basin, Chatfield Reservoir basin downstream ofthe USGSgage at Waterton and on 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 monitortngfor any receiving waters that may later enter into phosphorus monitoring requirements, or for facilities that use phosphorus chemicals for treatment. Ifphosphorus monitoring is a requirement ofthe permit then it shall be included within the terms and conditions of the individual Certification Rationale of the 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 of graphite mining, the federal effluent guidelines (40 CFR 436.382) 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 limits, coverage ofprocess water discharges from this type offaciliry must be under an individual permit. B. Stormwater Discharges 1. Stormwater vs. Process water When stormwater mixes with process water, the process water limitations (Partl.B ofthepermit) apply to the discharge of that mixed water The stormwater section (Part I C of the permit) is intended to cover those portions of a nonmetallic minerals production operation (exceprfuel) that are not already subject to effluent limitations under 40 CFR 436, and ro cover stormwater runofffrom asphalt and concrete batch plants. 2. Stormwater Management Plan (SWMP) The stormwater regulations primarily apply to areas not covered by 40 CFR Pan 436. They requirepermittees to develop and implement a Stormwater Management Plan (SWMP) to protect the quality ofstormwater leaving the site. Theplan shall identify potential sources ofpollution (including sediment) which may reasonably be espected fo affect the quality of stormwater discharges associated with mining activity. /n addition, the plan shall describe the best managementpractices (BMPs) which will be used to reduce the pollutanu in stormwater discharges from the mining site. Some activities required under the SWMP may already be in place. However, the SWMP will require the perminee 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 not 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 ofMinerals and Geology (formerly the Colorado Mined Land Reclamation Division)ofanysignificanrchangesatrheirsiteresultingfromtheimplementationoftheSWMP. This is so that the Division of Minerals and Geology may review the SWMP and incorporate any potential revisions into the facility's reclamation permit which might be needed. The SWMP shall include the following items, at a minimum: