HYDRO26167 - Laserfiche WebLink

Home Browse Search

YAK"1 1 Page lk of 19 Permit No. CO-0038776 B. MONITORING REQUIREMENTS (continued) 8. Control ProEram (Outfalls 002, 011 and 012) If required pursuant to Parts I.B.of this permit, Che permittee shall develop a control program to eliminate WET, through the identification and elimination of any toxicants or toxicant sources responsible for WET, or through the identification of toxicant treatability processes. The control program, along with any cost benefit analysis to determine whether the costs of construction bear a reasonable relationship to the resulting benefits, shall be submitted within the specified time frames. Such cost benefit analysis shall be used in accordance with Section 25-8-503(8) and (9), C.R.S. The control program, as submitted to or revised by the Division, may be incorporated into the permit. A control program may include, but shall not be limited to: additional pretreatment requirements imposed on specific indirect permittees by POTW's, modification of internal source control programs by industries, modifications of treatment plants, and/or best management practices for spills, leaks, etc. 9, Toxicity Incident Closure (Outfalls 002, 011 and 012) If WET is controlled through implementation of numeric limits for specific toxicants, through a control program eliminating Coxicants from the waste stream, or through the implementation of treatment processes, or if WET disappears and Division required accelerated testing demonstrate the continued absence of toxicity, the toxicity incident shall be considered closed. If the permittee completes all required phases of the toxicity incident response specified in compliance schedules, and is unable either to identify the causative toxicants and their sources or to identify feasible treatment options, the permittee may petition the Division for relief from further investigation and testing, consistent with the permit regulations. 10. Frequency and Sample Type - Chronic WET Testing (Outfalls 011 and 012) The monitoring frequency for chronic [oxicity tests shall be once every six months on a January - June, July - December sequence, and cannot coincide with acute testing. The first such test must be completed and reported on the December DMR due January 28. Chronic tests will be static replacement tests using three composite effluent samples, each of which is to be composited for a minimum of eight hours. Chronic testing will be conducted with both Ceriodaphnia sp. and fathead minnows during the first year. During years two and three, if requested in writing by the permittee, the Divsion may grant relief from continued two species testing. Such relief shall be for continued testing with only that species which has demonstrated the greatest sensitivity during the first year of testing. The results shall be submitted on the Chronic Toxicity Test report form, available from the Division. Copies of these reports are to be submitted to both the Division and EPA. Amended Effective