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GENERAL49221
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Last modified
8/24/2016 8:27:44 PM
Creation date
11/23/2007 4:56:44 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1982057
IBM Index Class Name
General Documents
Doc Date
10/26/1990
Doc Name
PROPOSED DECISION & FINDINGS OF COMPLIANCE FOR RN1
Permit Index Doc Type
FINDINGS
Media Type
D
Archive
No
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<br />The probable impacts to these sites will most likely be observed as a <br />diminution in quantity of water available and a degradation of water quality. <br />The impacts to Springs S-5, a colluvial spring, 5-41, a Williams Fork <br />Formation spring, will be observed as a decrease in quantity of water <br />available and a degradation of water quality. These springs will have their <br />recharge or source areas mined out. Springs S-41 and 5-23 both feed <br />registered stock ponas. 5-41 feeds Temple Pond No. 2, a registered right with <br />the State of Colorado. Spring 5-25 will apparently be mined through in the <br />mid to late 1990's. Spring S-1 may be effected by a redirection of ground <br />water potential toward the backfilled pits. <br />Dependent upon which side of the stream a colluvial spring, 5-23, is located, <br />it may be impacted by mining. If it issues from the southwest bank, its <br />recharge should not be affected. If it issues from the northeast bank, its <br />recharge could be interrupted by mining. Spring 5-23 feeds Temple Pond No. 1, <br />which is also registered. Both Pond Nos. 1 and 2 are number 1838 in basin <br />rank. The applicant will be replacing Pond No. 2 with Sediment Pond 006 as a <br />permanent structure. The other pond is upgradient of mining activities. <br />It will probably be a number of years after mining comes closest to these <br />springs that the effects in quantity and/or quality are observed. Again, this <br />is due to the low transmissivity and storativity values associated with the <br />local strata. <br />Most of these springs are used for stock watering, mining should not prohibit <br />this use, because TDS levels will not surpass EPA limitations for stock <br />watering purposes. <br />Post mining consequences of mining will be the development of spoils aquifers <br />in the backfilled pits. The reclaimed pits will have the highest <br />permeability/porosity values of any local aquifers. The backfilled pits will <br />induce recharge from precipitation and surface runoff, from up gradient in the <br />Williams Fork formation, and from down gradient in the Williams Fork and Wadge <br />coal. Until an Equilibrium is established between the backfilled pits and the <br />surrounding aquifers, a diminution of water quantity may be expected at some <br />springs (S-1, 5-5, 5-23, 5-41) and at Temple Well No. 1. <br />Eventually, springs and seeps will emanate from the topographically lowest <br />points of the reclaimed pits. These waters will be characterized by high <br />levels of iron, manganese, total dissolved solids, and possibly boron. Unless <br />this water is intercepted by holding ponds, it will add flow to the unnamed <br />drainage directly below the mining area and eventually to Hubberson Gulch and <br />Dry Creek. This flow may be expressed as surface flow, or as an increased <br />(elevated) water table, dependent upon local conditions. <br />It is projected that the concentrations of these parameters will decrease with <br />time as the readily dissolvable elements are leached until an equilibrium <br />level is reached. Further discussion of this is found under the Surface Water <br />portion of the Probable Hydrologic Consequences section. <br />-34- <br />
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