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PERMFILE113237
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PERMFILE113237
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Entry Properties
Last modified
8/24/2016 10:09:25 PM
Creation date
11/24/2007 10:22:03 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981010A
IBM Index Class Name
Permit File
Doc Date
12/11/2001
Doc Name
pages 4-233s to 4-248b
Section_Exhibit Name
4.8 Hydrologic Impacts Part 3
Media Type
D
Archive
Yes
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• 4.8.5.3 Infiltration Monaorinq <br />Pre-mining infiltration rates have been documented by soil type per Appendix G Part IV. Post-mining <br />infiltration rates were measured on regraded and retopsoiled areas in 1983-1986. Three infiltration tests <br />using a double ring infiarometer were made at three locations in each pit during each year. At each loca- <br />tion, three separate infiltrometer readings were taken and the average results used to characterize the <br />site. Tests were run during periods of low antecedent soil moisture conditions (Aug. and Sept.). Sample <br />saes were marked in the field and re-sampled each year. This provided data for the same sites over the <br />I'rfe of the perma and indicate trends in increasing or decreasing infiltration rates. <br />Many factors related to local soil properties influence infitration rates on premine and postmine lands. <br />These factors include surface and subsurface texture, abrupt horizon changes, porosity, permeability, <br />structure and cracking, depth, mineralogy, organic matter content, slope, aspect, and nature of the <br />parent rock. Some local soils are shallow wlth high organic content and often overlay fractured sand- <br />stone rock. Water seeping through fractures in the parent rock, as well as lateral subsurface flow, may <br />contribute to high intake rates. High intake rates may also be attributed to unencumbered water move- <br />ment through the soil profile. Some soils are moderately deep and overlay strataied clay shales. These <br />soils have a high clay content, most likely predominantly montmorillonae. Clays characteristically have <br />low infiltration rates due to swelling of clay minerals when saturated wah water. <br />• Considerable variability in infiltration rates exist between years on postminetl land. When comparing <br />premine to postmine data, the postmine infiltration rates all fall wahin the established premine infiltration <br />limits with the exception of the North Ashmore site in 1986 (Table 4.8-14). Postmine infiltration rates <br />ranged from a high of 22.9"/4 hrs to a low of 1.33'/4 hrs. Based on the data presented on postmine infil- <br />tration rates, Trapper proposed and the Division approved discontinuing infiltration sampling in 1987. <br />However, Trapper may re-evaluate postmine infiltration monitoring at some future date. <br />YR-3 _ _ <br />• a-za7d '' ~ iI=VISION i,P - Oyu I. <br />I'f~;tT~~-~"~f <br />i' <br />
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