2016-05-31_GENERAL DOCUMENTS - C2009087

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6/15/2016 State.co.us Executive Branch Mail - Re: PSCM hydro monitor plan proposal Map 2.04.7 M1 and should be. c. The Division would prefer not to suspend monitoring at site SSLG5 in order to evaluate water quality in Little Grassy Creek upstream of the affected area. 3. Item 3 - Discontinue monitoring at Spoil Springs 3, 4 and 6 (aka, SSSPG3, 4 and 6). These spoil springs issue from old Seneca II Mine workings in the Pond 002 basin. Final bond release for these areas was approved in 2015. a. According to the Findings Document for the SU bond release application; SSSPG3, 4 and 6 were not part of the bond release area. Over the last several years there has been exceedances of the manganese standard for agricultural use per the CWQCC Regulation 31 at the SSSPG3 and SSSPG6. Given this, further analysis will need to be done and the Division may have to consult with the Colorado Department of Public Health in order to discontinue monitoring of these sites. 4. Item 4 - Discontinue monitoring at Spoil Spring 7 (aka, SSSPG7). This spoil spring issues from old Seneca II Mine workings in the Pond 002 basin. It was buried during construction of the Lower Sump for the Sage Creek Mine. a. The location of SSSPG7 on Map 2.04.7 M1 shows this spring at the south end of Pond 002, some distance north of the Lower Sump. Based on the 2015 AHR, during 2002 when some re -grading of the Pond 002 shoreline occurred this spring was buried but re -appeared in 2003 but no longer exists because of the construction of the lower sump. Given this, discontinuing monitoring of this site would be appropriate. 5. Item 5 - Discontinue monitoring at Outfall 004 (Pond 004 on Cow Camp Creek in the Fish Creek basin). The new (2016) NPDES permit has dropped monitoring at this outfall, but has now required monitoring at two spoil springs above this pond: Spoil Spring 1 (aka, SSSPG1 = Outfall 006) and Spoil Spring 2 (aka, SSSPG2 = Outfall 005). a. Monitoring of Pond 004 can be discontinued. However, the surface water monitoring plan contained in Section 2.04.7 of the permit will need to be updated to account for this change and the two new NPDES discharge outfalls will need to be included in the monitoring plan. 6. Item 6 - Discontinue monitoring at wells SCAL69 (Cow Camp Creek alluvium) and SSP62 (Pond 004 spoils) for reasons given in above in Item 1. a. Do not discontinue monitoring either of these wells until the final Phase II I bond release of the former Seneca 11 mine affected area that contributes water to these wells has been approved. 7. Items 7 - Suspend monitoring (until mining resumes) at the rest of the remaining wells, except for the following. Well SGAL70 is the groundwater point of compliance well in the Grassy Creek alluvium. In addition, monitoring at two bedrock wells will be retained. Both these wells are in the area downgradient of the portal area. They are Wadge Coal Well CW2701 and Wadge Overburden Well COV2702. a. The following wells are used to determine the hydrologic impact from the Seneca II Mine that are included in the PSCM monitoring program; SOV42, SSP61, SSP62 and SCAL 69. These wells should not be suspended until the final Phase I I I bond release of the former Seneca I I mine affected area that contributes water to these wells has been approved. b. The following wells are eligible for suspension of monitoring COV11, COV23, COV2633, CW23, CW2632, SW17, SW19, SGAL71 and SSP27 until mining and/or reclamation operations resumes. 8. Item 8 - For all streams and springs, add a flow qualifier that only field parameters (temperature, conductivity and pH) will be performed (that is, no lab sample) when the flow is less than 1 gallon per minute. a. The Division would not approve this proposed change. On Tue, May 31, 2016 at 5:01 PM, Dennis <ddJones@hotmaii.com> wrote: Jared As I discussed with you earlier this year, here are the hydro monitor plan changes I propose for the Peabody Sage Creek Mine as a result of the suspension of mining for the near future. Attached is a copy of the current plan. https:Hmai l.google.com/mail/u/0/?ui=2&i k=e29129fcb5&view=pt&search=i nbox&th=1554f26bbd7a68d4&si m l=1554f26bbd7a68d4 215