2016-02-25_PERMIT FILE - C1982056 ‎(3)‎

• Permit No: C1982056A
• IBM Index Class Name: Permit File
• Doc Date: 2/25/2016
• Section_Exhibit Name: 2.04 Environmental Resources
• Media Type: D
• Archive: Yes

mining activities will result in mining and potential surface subsidence effects which extend beyond the eastern limits
of the previously surveyed and mined areas. TC has contracted with Metcalf Archaeological Consultants, Inc. to
complete intensive Class III cultural resource surveys for any areas subject to potential surface subsidence effects,
which have not already been surveyed. Generally, these surveys covered limited additional areas in Sections 10,
12, 13, and 14, T5N, R86W. The surveys resulted in identification of two new sites and one previously recorded
site which could potentially be affected by mining-related subsidence. Metcalf Archaeological Consultants, Inc.
reviewed the subsidence evaluations and profiles for the areas associated with the identified sites, and provided a
letter concluding that based on the very limited projected changes in ground elevation and gradient, the potential to
impact any buried cultural materials would be negligible. Review by both the CDRMS and SHPO resulted in
concurrence with this conclusion. Survey results are presented in the Confidential Appendix, in Exhibit 6L.
13LT Outby Utility Borehole (MR15-291, MR292) -_TC contracted with Metcalf Archaeological Consultants,
Inc. to complete intensive Class III cultural resources surveys of the proposed 13LT Outby Utility Borehole. The
surveys covered lands located in Section 20, T5N, R86W. Due to adverse ground conditions, the cultural resource
survey for the 13LT Outby Utility Borehole was conducted as an auger survey under study plans reviewed and
approved by the SHPO. The approved study plan involved augering to a depth of approximately 1.Om on a 15m
grid for the pad area, and on two parallel lines spaced 15m apart along the access corridor. This effectively resulted
in a 3Om wide inventory area for the access, and a 135m x 135m inventory area for the pad disturbance. The field
archaeology crew looked for staining and artifacts during the augering, screened the excavated material, and
prepare detailed field notes on stratigraphy, soil character, and any artifacts found. The 13LT Outby Borehole
Study Plan is presented in the Confidential Appendix, in Exhibit 6T. The field work did not identify any cultural
resources and resulted in a finding of no adverse effect, based on the preliminary survey report. Both the
preliminary and final survey reports are provided for reference in Exhibit 6T.
RULE 2.04.5 - GENERAL DESCRIPTION OF HYDROLOGY AND GEOLOGY
Each application shall contain a description and map, prepared in accordance with 2.10, of the geology, surface and
ground water systems including water quality and quantity, of all lands within the proposed permit area, the
adjacent area and the general area The description shall include information on the characteristics of all surface
and ,,round waters within the general area and any water which will flow into or receive discharges of water from
the general area. The description shall be prepared according to 2.04.5 and 2.04.7, and conform to the following:
(a) Information on surface and Groundwater systems including water quality, water quantity, and
geology related to the hydrology of areas outside the permit area and within the general area shall be provided by
Division to the extent that this data is available from an appropriate Federal or State agency.
(b) If this information is not available from those agencies, the applicant may gather and submit
this information to the Division as part of the permit application.
(c) The permit shall not be approved by the Division until this information is made available in
the application.
RESPONSE
This application contains comprehensive and detailed descriptions and maps concerning the geology and hydrology of
the proposed permit area, adjacent area, and the general area. The definitions of these areas, as contained in Rule
1.04, have been applied in what TCC believes to be a reasonable manner to the lands surrounding the planned mining
operation. The permit area contains all lands on which the operator will conduct mining operations during the term of
the permit. The adjacent area covers lands and resources outside the permit area which may be adversely affected by
mining operations. The general area includes the topographic and ground water basin surrounding the area to be
mined, including one or more watersheds containing perennial streams and ground water systems. The general area
is of sufficient size to allow assessments of cumulative hydrologic impacts in the basin.
A strict application of these definitions to Twentymile Park results in the areas shown on Map 4, Proposed
Hydrologic Area Boundaries. The proposed permit area includes all lands to be disturbed by mining activities over
PR15-11 2.04-9.2 02/01/ 16