PERMFILE111626

• Permit No: C1981010
• IBM Index Class Name: Permit File
• Doc Date: 3/16/1994
• Doc Name: 1993 Annual Hydrologic Report
• Section_Exhibit Name: Appendix W 1993 Report Section 2.5
• Media Type: D
• Archive: No

typically a good indicator of the TDS and in turn a good indicator •
of some major constituents. The first series of pages in Table B-1
of Appendix B presents the TDS, conductivity, and sum of major
constituents (DSSUM) for each Well along with several other
parameters. DSSUM was calculated by adding the concentrations of
major cations and the major anions, except for one-half of the
bicarbonate which is not added because this concentration is
evaporated during the measurement of TDS. This allows a comparison
of TDS and DSSUM, which is a good check on the TDS and major
constituent measurements. The first series of parameters presented
in Table B-1 also includes values of the charge balance (BALNC) of
the major constituents. BALNC is calculated as the difference of
cations to anions in meq/1 divided by their sum times 100. BALNC
is also a good indicator of accuracy of major constituents and
values between -10 and 10 are considered good. The TDS
concentrations from the Trapper Mine ground-water quality generally
compared favorably to the corresponding conductivity values.
3.3 pH
Field pH is an important parameter to monitor because some
coal spoils have the potential to increase acidity of the ground
water which increases the mobility of most heavy metals. A pH of
less than 5 would generally be needed to greatly increase the
mobility of most heavy metals.
Available pH data is tabulated in Table B-1 of Appendix B.
Field pH has varied from 6.6 to 6.8 in 1993 for water from well
3-8