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GENERAL32524
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Last modified
8/24/2016 7:55:01 PM
Creation date
11/23/2007 7:20:19 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1978116
IBM Index Class Name
General Documents
Doc Date
9/25/2006
Doc Name
Lysimeter Installation and Monitoring Plan Review and Approval
From
DRMS grm
To
Cotter Corporation
Permit Index Doc Type
General Correspondence
Media Type
D
Archive
No
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STATE OF COLORADO <br />- DIVISION OF RECLAMATION, MINING AND SAFETY <br />C,R~/cd~ /~~P/,Qca <br />Department of Natural Resources <br />1313 Sherman SL, Room 215 <br />Denver, Colorado 80203 <br />Phone: (303) 866-3567 <br />FAX: (303) 832-8106 <br />September 25, 2006'/ <br />C O L D AA D O <br />D I V I S I O N O F <br />RECLAMATION <br />MINING <br />-&- <br />C^C r~ SAFETY <br />RC6~C~~l~p Bill Owens <br />Governor <br />SEP ~ ~ ~l)Vb Russell George <br />~+ Executive Director <br />I~IYISIOn Ot ndUafilatl0n, Ronald W. Cattany <br />Glen Williams / Mining and Safety Division Director <br />Cotter COrpOratlOn Natural Resource Trustee <br />P.O. BOX 700 <br />Nucla, Colorado 81424 <br />Re: SM-18 Mine, M-1978-II6, Lysimeter Installation and Monitoring Plan Review and Approval. <br />Dear Mr. Williams: <br />The Division of Reclamation, Mining and Safety has reviewed the plan Cotter submitted for installation <br />of a lysimeter well at the SM-18 Mine down gradient from existing waste dumps. The purpose of the <br />well is to collect data for review on the possible migration ofgeo-chemical constituents identified in <br />waste rock into the underlying bedrock. <br />Primarily the well will determine if there is any localized groundwater directly below and down gradient <br />from the dump that would create a path for the identified constituents to reach waters that could <br />potential create a condition that is harmful to human health and the environment. The well and <br />monitoring may provide empirical data to support modeling presented in Cotter's appeal of DMO status <br />determination by the Division. The secondary use of the well will be an early detection system for any <br />potential migration of the identified geo-chemical constituents in the future. <br />The placement of the well is in a location that Division staff and Cotter agreed upon during the May <br />2006 t5eld visit. The constnlction diagrams for the wel[ were presented with maps in a "Supplemental <br />Geology Report" submitted to the Division on August 10`h, 2006. The Division is approvint; the <br />location and construction of the well as submitted. The Division will require a copy of the drill logs and <br />construction notes within 10 working days of final construction of the well. <br />Cotter has proposed a monitoring schedule of monthly sampling to establish a baseline set of data. The <br />Division feels that a more aggressive monitoring plan for the first 3 months is in order and gradual <br />scaling back of frequency if no detections are observed. The preferred schedule is once every 2 weeks <br />for the firsC 3 months provided no moisture is detected. If moisture is detected, the Division must be <br />notified within lOworking days in writing and the sampling frequency maybe modified dependin; on <br />volumes and other parameters. Any water samples collected from the lysimeter are to be tested for <br />constituents per groundwater standards. Once the 3 month period has been completed, a review of data <br />will be used to determine future sampling intervals. Tfno moisture is detected during the first sampling <br />interval, the schedule may be reduced to quarterly for the next 4 quarters and possibly further after that <br />review. All sampling reports are to be submitted to the Division in writing within 10 working days of <br />either the actual sampling date or receipt of laboratory results from that sampling period. <br />Oftice of Office of <br />Mined Land Reclamation Active and Inactive Mines <br />
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