2016-06-16_REVISION - C2010089 (2)

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2 2.04.5 General Hvdrologv Description This is a review of the permit requirements for, mapping and describing baseline surface water characteristics including water quality and quantity. The permit as per section 2.04.5 and associated Map 2.04.5-1 adequately addresses this section of the rules. 2.04.7 Hydrology Description This is a review of the permit requirements for, describing and monitoring surface water the characteristics. The permit as per section 2.04.7 (Hydrology Description), Appendix 2.04.7-2 (Water Quality Monitoring Data) and associated Map 2.04.7-1, adequately addresses this section of the rules, with the exception of. 1. Please demonstrate that flow duration curves of 1965 for, the San Miguel River at Naturita adequately predict flow conditions in 2016. 2. Table2.04.7.4 is difficult to read at the font size used. This problem will only be exacerbated when ingested into the DRMS document storage system and subsequently reproduced. Please provide a more legible copy at an enlarged font. 3. As per page 19 of section 2.04.7 historic water flows indicate values for, certain water quality parameters. Please compare the values for, the water quality parameters cited and based on historic flows with values for, the same water quality parameters in 2016. Are the values over time similar or, different? 4. As per page 19 of section 2.04.7: as of 1957 approximately 15,000 acres were actively irrigated between Placerville and Naturita. Please demonstrate that: a. Irrigated acres remain at or, near 15,000 b. The referenced 1965 water budget and associated TDS contribution for, this vicinity remains representative of 2016 conditions 5. Please direct the DRMS to the section in the permit document where abandonment or, suspending water monitoring sites are discussed and documented. 6. Please cite in section 2.04.7 of the permit document either the section where abandoned and suspended water monitoring sites are discussed or, the TR (Technical Revision) that approved the termination of the monitoring sites. 7. Table 2.04.7-5 is difficult to read at the font size used. This problem will only be exacerbated when ingested into the DRMS document storage system and subsequently reproduced. Please provide a more legible copy at an enlarged font 8. Table 2.04.7-6 is difficult to read at the font size used. This problem will only be exacerbated when ingested into the DRMS document storage system and subsequently reproduced. Please provide a more legible copy at an enlarged font 9. Table 2.04.7-7 is difficult to read at the font size used. This problem will only be exacerbated when ingested into the DRMS document storage system and subsequently reproduced. Please provide a more legible copy at an enlarged font. ♦ It is not clear from the maps in the PRI application package where ditches, culverts and ponds intersect. It seems likely that Map 2.05.3(4)-1 was intended to fill this requirement, however it appears that there is some confusion with this map and post mining topography. 10. Please either prepare a map that shows all these structures and associated watersheds and watershed sizes on one map, e.g. update map 2.05.3(4)-1 and resubmit or, indicate to DRMS what map exists illustrating this information. 11. Also, please submit to the DRMS a culvert table calling out culvert names and sizes. 12. Map 2.04.7-1 shows monitoring locations and their elevations. Elevations are difficult to determine because of overlapping text or, symbology. Please as per Rule 2.10: a. Make sure text and symbology are offset from one another b. Make the values for, elevation more discernible, (bold or, more saturated color). New Horizon North Permit Revision PR1 Prepared by: R. Reilley Date: June 2016 Document Location: M\\Coal\rar\Mifferm Reviews