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In the most recent EPP update (TR-28) Climax described the clean water interceptor system in <br /> Section T-5 as follows: <br /> "Climax recognizes their importance to the overall water management system, but notes that the <br /> clean water interceptors do not appear to meet the definition of an EPF since they carry only un- <br /> impacted water around the site and do not contain or control designated chemicals or process <br /> solutions. As agreed upon with DRMS, although these systems are considered to be pre-EPF <br /> systems and do not contain or control designated chemicals or process solutions,they will be <br /> managed by Climax as internal EPFs. The interceptor systems are closely monitored, inspected and <br /> maintained as part of routine site monitoring activities. Other than repair and maintenance/upgrades, <br /> any future expansion or modifications of the interceptors will be subject to review by DRMS, <br /> consistent with Section 6.4.21(1 0)(a)(ii) of the Rules." <br /> In accordance with TR-28, Climax is providing stamped/signed construction drawings for the West <br /> Interceptor Phase D improvement project titled"Interceptor Rehabilitation Project, West Interceptor <br /> Culvert Replacement(Phase D) Downstream of Searle Gulch". Once construction is complete, <br /> Climax will submit a certification for this facility from the EOR. <br /> The Division also verbally asked a question about the hydraulic capacity of the West Interceptor <br /> once the Phase D improvements were complete as it relates to the evaluation that Climax completed <br /> in 2014 as requested as part of TR-18. The Division originally requested that Climax complete a <br /> hydrologic analysis to determine if the interceptor systems could safety pass a 10-yr/24-hr rainfall <br /> event and it was determined that there were portions of the West Interceptor that could not pass this <br /> size event. A 10-yr/24-hr rainfall event for the West Interceptor System at Searle Gulch is estimated <br /> to be about 145cfs. After the Phase D improvements are made to the West Interceptor, the overall <br /> capacity will increase to 106cfs from the current 86cfs for the section downstream of Searle Gulch. <br /> Additional improvements downstream from Phase D are planned for the future that will pass 145cfs; <br /> in the meantime, a gate will be used at the upstream end of Phase D to limit the flow to 106cfs. <br /> Please contact Raymond Lazuk at 719-486-7584 or me at 719-486-7525 if you need additional <br /> information. <br /> Sincerely, <br /> :7-� If Z4� <br /> Diana Kelts <br /> Chief Environmental Scientist <br />