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GENERAL46097
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GENERAL46097
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Last modified
8/24/2016 8:17:06 PM
Creation date
11/23/2007 2:20:28 PM
Metadata
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Template:
DRMS Permit Index
Permit No
C1980005
IBM Index Class Name
General Documents
Doc Date
12/6/2002
Doc Name
Proposed Decision & Findings of Compliance for RN4
Permit Index Doc Type
Findings
Media Type
D
Archive
No
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trend towazd increasing TDS. Because the systems receive water from other <br />sources, the relative amounts of high-TDS spoils water and relatively "clean" water <br />vary with other factors, so the trend of increasing salt content is not cleazly defined. <br />One exception to the non-lineaz trend is the water from the alluvial well GWS6-A <br />which displays a smooth trend of increasing dissolved solids. Possibly this well <br />samples a zone receiving a relatively constant supply of spoil water and thus shows <br />TDS concentration increasing lineazly with time. <br />Wells in the alluvium of the two east-draining creeks show that high-TDS water <br />from mining activity has not yet migrated very far beneath those creekbeds. The <br />wellsite nearest the disturbed azea, S46-A on Cow Camp Creek just downstream of <br />Pond 004, displayed a decrease in TDS concentration from 1987 to 1991 and has <br />increased since then. The well downgradient of that, S69-A, has recently displayed a <br />trend of decreasing TDS. Possibly the water being sampled currently at S69-A is <br />that which passed through the upstream site several years ago. Using that <br />hypothesis, the travel time for groundwater within the Cow Camp Creek alluvium is <br />lower than calculated below. <br />Water from the well in Bond Creek has not shown TDS levels elevated much <br />beyond their historic values, neaz 5000 mg/1. <br />When Seneca Coal Company can demonstrate that the reclaimed lands meet the <br />phase II bond release criteria, the sediment ponds, excepting the Wadge, Pond 003, <br />and PeCoCo Impoundments, which ate approved permanent impoundments, will be <br />removed from the site. At that time, it is assumed that the majority of baseflow to <br />Cow Camp, Bond and Grassy Creeks will be contributed by spoil aquifer discharges <br />to the surface system. <br />In the Grassy Creek Drainage, the quantity and quality of the flows will be similar to <br />present conditions. All of the spoil spring dischazges issuing into the Grassy Creek <br />drainage will pass through the Wadge Impoundment, a permanent structure. <br />Dilution and mixing within the impoundment will diminish the concentration of <br />dissolved solids discharged to the alluvial system. As mining continues in this <br />drainage, some increase in dissolved constituents is expected. Data collected at <br />NPDES sites 002 and 003, which dischazge disturbed azea drainage into Grassy <br />Creek, indicate that there has been an increase in TDS, based on monthly average <br />concentration (June through September) on a yeazly basis for the yeazs 1982 through <br />2002. It should be noted, however, that the rate of increase, based on monthly <br />average TDS concentration on a yeazly basis, appeazs to have stabilized during this <br />period. Therefore, it is not expected that the quality of the effluent will further <br />degrade the alluvial water quality in the Grassy Creek Drainage. <br />29 <br />
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