HYDRO22157 - Laserfiche WebLink

Home Browse Search

Part I Page lg of 19 • Permit No. CO-0042161 B. MONITORING REQUIREMENTS 8. Control Program (Cont.) 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 If WET is controlled through implementation of numeric limits for specific toxicants, through a control program eliminating toxicants 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 tonicity, 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 The monitoring frequency for chronic toxicity tests shall be once every aiz 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, 1990. Chronic tests will be static replacement tests using two composite effluent samples, from two adjacent discharge events, each of which is to be composited for a minimum of eight hours. The chronic test will be initiated after receipt of the first sample by the testing laboratory. 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 Tonicity Test report form, available from the Division. Copies of these reports are to be submitted to both the Division and EPA. • Revised 5/2/89 Amended n2/n7/4n Doc 1003M Effective 02/07/90