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2004-08-02_REVISION - M2000158 (3)
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2004-08-02_REVISION - M2000158 (3)
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Last modified
6/15/2021 2:49:24 PM
Creation date
11/21/2007 2:39:54 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M2000158
IBM Index Class Name
Revision
Doc Date
8/2/2004
Doc Name
Response to Adequacy Ltr
From
Environment Inc
To
DMG
Type & Sequence
AM1
Media Type
D
Archive
No
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ENVIRONMENT. INC. PAGE 4 <br />AUGUST 2, 2004 <br />Any water pumped from the lined area will be isolated from the <br />surrounding groundwater table by the slurry wall so its re- <br />moval will have no affect on surrounding wells. Any water <br />that evaporates from the developed water storage will be our <br />water and. no make up will be needed. <br />7. Platte Sand & Gravel LLC has no current water rights to use <br />for filling the lakes. We are currently in negotiations with <br />a group of investors to purchase the two storage reservoirs. <br />If this happens then Platte Sand & Gravel will actually be <br />constructing the reservoirs and we understand that they have <br />the water needed to-fill and operate the facility once com- <br />plete. In addition, Platte River Ranch LLC (property owner) <br />has water in the Western Mutual Ditch that can be converted <br />and stored in the reservoirs if needed. Research by Leonard <br />Rice and Associates indicates that the water could be con- <br />verted and stored in the reservoirs if needed. <br />8. None will be changed with regards to the unlined lake areas. <br />We still plan to install and maintain the recharge ditch along <br />the eastern mining limits if needed. The liner will isolate <br />the area we plan to dry mine from the surrounding aquifer so <br />the dewatering activities will have no affect on the water <br />table outside the lined area. One typically finds that the <br />liner acts as a dam in the water table and an increase in the <br />water table depth is seen, not a decrease. This is supported <br />on page 3 of the GEI report that reads in part "2. A minOrrise <br />(less than 4 foot) in the groundwater tables should be expected ..." GEI <br />addressed how this possible increase will be handled above by <br />installation of a ditch to regulate the height of the water <br />table to avoid inundating the pastures immediately adjacent to <br />the liners. The inundated area would be contained entirely on <br />the mine site since the slurry wall proposed for Sharkey's Lake <br />6600 feet north of the south property line. <br />The closest offsite surface well, any well that lies within <br />the same aquifer at the mine, is owned by Dr. Ptaznik and is <br />located approximately 1700 feet east of the Longhorn Lake <br />liner. Since no dewatering will take place in the reservoir <br />areas until the liner around Longhorn Lake and later Sharkey's <br />Lake, is complete the adjoining wells will be unharmed. We <br />have made no proposal to change the water agreement with the <br />neighbors as some dewatering may take place on the other lake <br />areas as mining progresses after the reservoirs are complete. <br />Attached is a copy of•the neighboring well map submitted as <br />Adequacy Exhibit #4 on March 26, 2001 for your review. <br />9. Very little would change in the floodwater mitigation plan by <br />the installation of the water storage reservoirs. Installa- <br />tion of armoring on the cross banks of the reservoirs <br />(east/west banks) will still be needed as proposed in the <br />original permitting. The change is that entire slope face <br />will be armored instead of just a small band at the water <br />line. This is necessary incase the reservoirs were nearly <br />empty if a flood occurs. <br />
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