2008-01-10_REVISION - C1992080 (3)

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Requirements for removing a pond, Require- Section 4.05.2(2) ment met Comment (Yes / No) Pond 1 (outfall 001) and Pond 2 (outfall 002) discharge to Segment 13b of the Animas and Florida River Sub-basin of the San Juan and Dolores River Basin. CWQCC lists numeric standards for this segment in its regulation 3.4.0. Following its "Procedural Guidance" document, CWQCD would have set the reporting requirements and limitations for outfalls 001 and 002 based on those pollutants in the discharge having a reasonable potential for causing an exceedance of the instream standards. Ponds I and 2 have discharged only a The quality of untreated drainage from the few times in recent years during springtime snowmelt/runoff. The CDPS compliance disturbed area meets the state water quality record indicates the discharges have not caused a violation of the instream standards. It is standards for receiving streams that will be Yes reasonable to believe removal of the ponds will not change the chemical quality of surface applicable after the sedimentation ponds and water flowing past the locations of outfalls OOI and 002. treatment facilities are removed, if any. The original topsoil was left in place on the disturbed lands that discharge to ponds 1 and 2. The quality of untreated drainage from the disturbed areas can be expected to be alkaline and have a chemical composition similar to drainage from adjacent undisturbed areas. Consequently, the drainage from the disturbed areas can not be expected to cause an exceedance of the instream standards. There probably is not enough waste liquid contained in old equipment in the storage area to cause an exceedance of instream standards, should a release occur. The quality of untreated drainage from the disturbed area meets the federal water quality standards for receiving streams that will be Yes Federal instream standards are included in the state instream standards. applicable after the sedimentation ponds and treatment facilities are removed, if any. Removal will occur no sooner than 2 years after The 2006 ARR indicates the last seeding of the permanent seed mix was in August 20; the last seeding within the affected contributing No therefore, the required minimum 2-year period will expire in August 2008 watershed. . Untreated discharges from underground workings either continuously meet effluent Yes The Carbon Junction Mine has no discharges from underground workings. limitations., or have permanently ceased. In-lieu of numerical effluent quality limitations, 40 CFR 434.81 - 434.82 specifies Using BMPs to meet effluent limitations (40 performance standards to serve as limitations where BMPs are used for controlling CFR 434.81 - 434.82) drainage quality on reclaimed sites and topsoil stockpile areas. The Carbon Junction Mine meets the basic qualification for using its BMPs (revegetation and drainage reconstruction) to meet the effluent limitations of 40 CFR, Part 434, as the site meets the definitions of "reclamation area" and "topsoil stockpile area". The site also meets the other