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COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division <br />Rationale -Page 30 Permit No. CO-0045675 <br />F) Within 3 calendar days ojidentifying elevated groundwater table conditions in M-31 and M-.33, the permittce shall <br />also: (i) confirm that the average groundwater table elevation in West Pit backfill groundwater monitoring <br />wells BF-4 and BF-5 nre below an elevation oj8581 fi amsl, (iiJ conduct a seepage inspection as descriied in <br />Section A.S(5J, (iiiJ collect a water quality sample from RS-1 to confirm that water quality standards are being <br />met in the Rito Seca. The results of these measurements or observations shall be transmitted in a report ro <br />WQCD within 14 days of completing all of the measuremenu and observations. A separate compliance <br />schedule activity, may be required under Sections A. S(3J, A.S(SJ, and A.S(7J if any of drese inspections or <br />measurements indicate conditions of the groundwater system that are not consistent with the termr and <br />limitations set forth in this permit. <br />4) Compliance Schedule for RS-2 Water Quality Monitoring <br />The jollowing compliance schedule shall be implemented in the event that any constituent esceeds the appl.!cable <br />water quality standard for the Rilo Seco. <br />a) 7Re permittee shall conduct verification sampling at RS-1 within 3 days ojpermittee recerpt ojany sample jot a <br />constituent identified as exceeding the applicable water qualiry• standard specified in Pnrt !Il.A.1 .>j the <br />Rationale. Results of thejrst verification sampling shalt be transmitted verbally ro the WQCD by the end oJthe <br />first calendar day jollowing permittee receipt of the analytical results. /j the results of rite first verification <br />sample indicate that the water quality standards in the Rico Seco are being met, the normal monthly sampling <br />schedule ar RS-1 will resume as set forth in Paragraph 7. <br />bJ !f the results ojthe first verification sample indicate that the concentration ojone or more constituent esceeds <br />the applicable water quality standard in the Rito Seco, the permittee shall complete the activities described in <br />Paragraph 7(cJ. <br />c) Within 3 calendar days ojpermittee's receipt of the first verification sampling, the perntirtee shall initiate the <br />jollowing measurements and observations to establish that: (iJ the groundwater flow direction is toward the <br />West Pit, (iiJ there are no seeps along the north bank ojthe Rito Seco between the area ojhistorica! seepage <br />and RS-1, and (iiiJ the average groundwater table elevation in the downgradient alluvia! capture system is <br />equal to or belos.• 8540 fi. amsl. The results of these measuremenu or observations shall be transmitted in a <br />report to WQCD within l4 days of completing a!! of the measurements and observations. A separate <br />compliance schedu/e activity, may be required under Sections A.S(3), A.S(SJ, and A.S(6J if any of these <br />inspections or measurements indicate conditions aj the groundwater system that are not consistent with the <br />terms and limitations set forth in this permit. <br />dJ The permittee shall submit to the WQCD a report within 30 days summarizing the results oja!! mea.turemenrs. <br />lJthe resulu ojthe groundwater measurements and seep survey indicate that the groundwater control rystem is <br />meeting the terms and limitations set forth in this permit, the routine monthly sampling at RS-1 will resume. <br />eJ Ijany component ojthe groundwater contra! rystem is not performing within the limits set josh in uiis permit. <br />the permittee will be required (o initiate appropriate compliance schedule activities, including the preparation <br />of a response plan, jar any and all components of the groundwater contra! rystem (hat do not mezt the <br />applicable requirements. 77te permittee shall also conduct weekly sampling ar RS-1 until such time as the other <br />compliance schedule activity lies) have been completed.. <br />E. SpeclRc Comp/lance Requirements <br />Submissions to the Division: Listed below are specific compliance items which require pennlttee action. <br />referenced parts of the permit for details on what is required. <br />Code Event Permff Citation Due Date <br />90508 Submit Materials Containment Plan Part I.D.1. 90 days after eftec6ve <br />date of permit <br />Part I.A.S. No specific date(s) indicated <br />VII. REFERENCES <br />