My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
PERMFILE138169
DRMS
>
Back File Migration
>
Permit File
>
400000
>
PERMFILE138169
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
8/24/2016 10:38:46 PM
Creation date
11/26/2007 7:08:53 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1994082
IBM Index Class Name
Permit File
Doc Date
12/11/2001
Section_Exhibit Name
TAB 17 PROBABLE HYDROLOGIC CONSEQUENCE
Media Type
D
Archive
No
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
72
PDF
Print
Pages to print
Enter page numbers and/or page ranges separated by commas. For example, 1,3,5-12.
After downloading, print the document using a PDF reader (e.g. Adobe Reader).
View images
View plain text
• TAB 17 <br />PROBABLE HYDROLOGIC LONgEOUENLES <br />Ground Water <br />Introduction. This tab contains a discussion of the probable hydrologic consequences of <br />the Toast mining plan on the quality and quantity of surface and ground water for the <br />proposed permit and adjacent areas. The significance of each impact or potential impact <br />was determined. The determination of significance has been made considering the magnitude <br />and extent of the impact of a probable hydrologic consequence on the hydrologic balance, <br />existing eater uses, and the intended postmi ni n9 land use of the area. <br />Ground Water Inflows to Pits and Drawdouns. <br />Introduction. This section describes the methods and results used to determine the <br />probable hydrologic consequences of mining in the Yoas[ mining area to ground water <br />• quantity. In order to make the impact assessments, two different analysis techniques were <br />employed. First, pit inflow volumes were determined on an annual basis using an <br />analytical model developed by GeoTrens based on published work by McWhorter (1982). The <br />second analysis determined annual drawdowns in the adjacent overburden and coal aquifers <br />caused by pit inflows using the Theis equation. Because of the limited use potential and <br />yields from the overburden, 4adge and Wolf Creek coal units, the use of more sophisticated <br />analytical techniques (e.g., digital models) is not warranted. <br />McWhorter Analysis for Calculating Pit Inflows. The following is a discussion of the <br />assumptions and input data used in performing the McWhorter pit inflow analysis. Mining <br />is projected to intercept the wedge overburden, the Wedge coal, the Wedge and erburden <br />(Wolf Creek overburden), and the Wolf Lreek coal. Potentiomet ric surface contours for <br />each unit were drawn on mine plan maps (scale: 1"=400') showing areas to be mined each <br />year of the proposed life-of-mine plan. Using a digitizer, saturated and unsaturated <br />areas for each unit were determined by year. The saturated thicknesses for the Nadge and <br />Wolf Lreek overburden were calculated using contour maps of the top of the wedge and Wolf <br /> Creek coals and potentiome[ric contours for the overburden units. The wedge coal's <br />i maximum saturated thickness ranged from 7.5 to 13.5 feet, while the Wolf Creek coal's <br /> saturated thickness was a consistent 17 feet. Potentiomet ric contours for the Wedge and <br />1 Revised 03/24/95 <br />
The URL can be used to link to this page
Your browser does not support the video tag.