REP09781

• Permit No: C1980005
• IBM Index Class Name: Report
• Doc Date: 6/25/1992
• Doc Name: 1986 AHR Table of Contents
• From: Peabody Coal Company
• To: DMG
• Annual Report Year: 1986
• Permit Index Doc Type: Hydrology Report
• Media Type: D
• Archive: No

relative iy low TDS value. This is rvhat one we u1C expect in an undisturbed drains ce in
this area
Two
m
r
a
t an
l
d f
d COOK'
i
i
t T
bl
d
d
(
,
p
ra
e
e
s a
yze
v
or excee
rece
ng s
ream stan
ar
s
see
a
e
21) even though no mining has occurred in this basin. P, high total copper concentration
of 100 ug/1 exceeds the standard of 2Z ug/1, and a high total iro n value of 2.2C mg/1
exceeds the standard of 1.0 mg/1. This should be taken into consideration before
evaluating future impacts on Bond Creek, and the existing impacts of Cow Camp Creek,
8. Little Grassy Creek Drainage
Three monitoring sites lie within the Little Grassy Creek drainage: surface water site
SW-S2-5 located in the southwest portion of the permit area, NPDES Discharge Point 002,
also known as the Wadge Impoundment, and NPDES Discharge Point 003, also known as the Shop
Reservoir or the Northwest Impoundment, located just north of the mine shop and facilities
area.
1. Surface Water Site SW-52-b
Surface water site SW-S2-5 drains the upper reaches of Little Grassy Creek which is
essentially undisturbed by mining, P.eview of the hydrograph of monthly flan readings
shows less runoff in 1986 than in 1985.
i
f
9 The CSG data shays a peak flow of 5.8 cfs in the
spr
ng o
1
86, compared to a flow of 13 cfs in the spring of 1985.
Review of Table 16 shows water at this site Lo be a calcium/magnesium sulfate type water
I ~~
with a relatively stable TDS (since 1981) that may vary in high water years.
2. NPDES 002
Flow data presented in Table 22 and hydrographs (1981 to 1986 and 1986 alone) presented in
Appendix D, show a smaller peak runoff in 1986 than in 1985 for similar reasons as
discussed earlier at NPDES 004. Peak mean daily flow was 4.8 cfs on March 9, 1986, while
it was 10.5 cfs on April 9, 1985. Total discharge was 447 ac-ft in 1986, while it was 773
ac-ft in 1985.
Review of Table 17 shows water at this site remaining a magnesium sulfate type water.
Flows display a relatively stable TDS (since 1981) that varies from high to low water
years. No excursions of NPDES effluent limits were observed here in 1966.
's. NPDES 003
Hydrographs presented in Appendix D show that flow has increased at this site since
46