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PART I <br />~ ~ Page lg of 19 <br />Permit No.: CO-0032751 <br />B. MONITORING REQUIREMENTS <br />2. Renorting of Data (Continued) <br />The first dunlicate signed copy of each discharge monitoring reF~ort <br />(DMR) shall be submitted to the following agency: <br />U.S. Environmental Protection Agency <br />Water Management Division <br />NPDES Branch 8WM-C <br />999 18th Street, Suite 500 <br />Denver, CO 80202-2466 <br />The third and fourth copies are for the permittee records. The <br />Discharge Monitoring Report forms shall be filled out accurately and <br />completely in accordance with requirements of this permit and the <br />instructions on the forms. They shall be signed by an authorized person <br />as identified in Part I.D. <br />3. Whole Effluent Toxicity Testing. - Outfall 001 <br />~ Testine and Renorting Requirements <br />Tests shall be done at the frequency listed in Part I.B.1. Test <br />results shall be reported along with the Discharge Monitoring Report <br />(DMR) submitted for the reporting period during which the sample <br />was taken. (i.e., WET testing results for the first calendar quarter <br />ending March 31 shall be reported with the DMR due April 28.) The <br />results shall be submitted on the Chronic Toxicity Test report form, <br />available from the Division. Copies of these reports are to be <br />submitted to both the Division and EPA along with the DMR. <br />The permittee shall conduct each chronic WET test in general <br />accordance with methods described Short Term Methods for Estimative <br />the Chronic Toxicity of Effluents and Receiving Waters to Freshwater <br />Organisms, EPA/600/4-89/001 or the most current edition, except as <br />modified by the most current Division guidance document entitled <br />Guidelines for Conducting Whole Effluent Toxicity Tests. The <br />permittee shall conduct such tests using Ceriodaphnia dubia and <br />fathead minnows. <br />(b) Failure of Test and Division Notification (Prior to Effective Date <br />of Limitation) <br />Prior to the effective date of the limitation, a chronic WET test is <br />failed whenever 1) there is a statistically significant difference <br />in lethality between the control and any effluent concentration less <br />than or equal to the instream waste concentration ("IWG") arni, 2) <br />the IC25, which represents an estimate of the effluent concentration <br />at which 25X of the test organisms demonstrate inhibition as <br />reflected by lethality, is at any effluent concentration less than <br />or equal to the IWC. The IWC for this permit has been detennined to <br />be 23.7X. <br />Amended Effective <br />