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Michael P. Boulay, P.G. <br />Environmental Protection Specialist III <br />Colorado Division of Reclamation, Mining and Safety <br />Grand Junction Field Office <br />Phone: (970) 243 -1571 <br />FAX: (970) 241 -1516 <br />E -Mail: mike.boulay@state.co.us <br />From: Jones, Dennis D. [ mai Ito: DJones() Pea bodyEneray.com <br />Sent: Thursday, May 24, 2012 11:17 AM <br />To: Boulay, Mike <br />Cc: Burgmaier, Susan; Musick, Jason <br />Subject: RE: well abandonments <br />Mike, <br />Per our conversation today, here is what I believe we agreed to in regards to well abandonments. <br />For the Office of the State Engineer (OSE) permitted alluvial wells, follow the OSE guidelines. That is, sand from the <br />bottom of the well up to the static water level, then grout to surface. <br />For wells without a OSE permit, pour bentonite chips (slowly, to prevent bridging) from the bottom up to the top of the <br />screened zone. Then pour sand (or bentonite) up to the static water level. From the static water level up to 3 feet below <br />ground surface, pour bentonite pellets. Finally, cement the top 3 feet of the hole. <br />Attached is a partially complete spreadsheet I am using for these abandonments. Wells beginning with a W belong to <br />Seneca 11 -W. Wells beginning with Y belong to Yoast . These wells have been approved for abandonment per the <br />approved TRs that you and I worked on several years ago. OSE permitted wells are indicated with an *. <br />Wells beginning with a S are old Seneca II wells now in the Sage Creek Mine permit area. None of these wells are part of <br />the current monitoring program. They are all wells that have failed, or monitor the old fly ash pit (NW of the mine office, <br />outside of the permit area). <br />Info on all these wells may be found in the AHRs, Appendix A, Summary of .... Wells. Completion info for these wells are <br />found in the PAPS. <br />Please reply if you agree, or if you see any problems. <br />Thanks <br />Dennis Jones <br />Hydrologist - Seneca Coal Co. <br />970 - 276 -5209 <br />djones(@peabodyenergy.com <br />P <br />37796 County Rd. 53 <br />PO Box 670 <br />