U.S. Department of the Interior 

U.S. Geological Survey

Water-Quality Data (July 1994 through 

September 1996) and Statistical Summaries 

of Data for Surface Water in the 

Sand Coulee Coal Area, Montana

By Philip L. Karper

Open-File Report 98-94
U.S. Department of the Interior

BRUCE BABBITT, Secretary

U.S. Geological Survey

Thomas J. Casadevall, Acting Director

Helena, Montana 

May 1998

For additional information write to:

District Chief 

U.S. Geological Survey 

Federal Building, Drawer 10076 

Helena, MT 59626-0076

Copies of this report may be purchased from:

U.S. Geological Survey 

Branch of Information Services 

Box 25286 

Denver, CO 80225-0286
CONTENTS Page

Abstract .............................................................................................................................................................^ 1

Introduction...............................................................................................................................................^ 1

Purpose and scope...................................................................................................................................................... 1

Sampling locations and types of data.................................................................................................................................... 1

Contrnuousstreamflowdata............................................^ 4

Water-quality data................................................................................................................................................................. 4

Methods ................................................................................................................................................................^ 4

Results.............................................................................................................................................^ 8

Quality assurance....................................................................................................................................................... 8

Statistical summaries of data................................................................................................................................................. 10

Selected references..........................................................................................................^^ 10

Data...................................................................................^^ 12

ILLUSTRATIONS

Figure 1. Map showing location of study area............................................................................................................ 2

2. Map showing location of sampling sites in the Sand Coulee Creek basin, Montana.................................. 3

3. Map showing location of sampling sites in the Belt Creek basin, Montana................................................ 4

4.-8. Hydrographs showing daily mean discharge for:

4. Sand Coulee Creek above Cottonwood Creek at Centerville, Montana.............................................. 6

5. Cottonwood Creek near Stockett, Montana......................................................................................... 6

6. Number Five Coulee below Giffen Spring near Stockett, Montana.................................................... 7

7. Sand Coulee at Sand Coulee, Montana................................................................................................ 7

8. Anaconda drain at Belt, Montana........................................................................................................ 8

TABLES

Table 1. Type and period of data collection at sampling sites in the Sand Coulee Coal Area, Montana..................... 5

2. Properties and dissolved constituents analyzed in water samples from sites in the Sand Coulee Coal

Area, Montana ............................................................................................................................................ 9

3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September

1996.................................................................._ 13

4. Chemical analyses of field replicates for water samples from sites in the the Sand Coulee Coal Area,

Montana, July 1994 through September 1996 ............................................................................................ 107

5. Chemical analyses of field blanks for water samples...................................................................................... 118

6. Statistical summary of water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994

through September 1996............................................................................................................................ 121

CONTENTS iii
CONVERSION FACTORS AND ABBREVIATED WATER-QUALITY UNITS

Multiply By To obtain

cubic foot per second (ft3/s) 0.0283 1 7 cubic meter per second 

gallon (gal) 3.785 liter (L)

mile (mi) 1 .609 kilometer 

acre-foot (acre-ft) 1,233 cubic meter (m3) 

___________ ton per day (ton/d) ______________ 907.2 _____________ kilogram per day

Temperature can be converted from degrees Celsius (°C) to degrees Fahrenheit (°F) by the equation:

°F = 9/5 (°C) + 32 

Abbreviated water-quality units used in this report:

micrograms per liter 

micrometer

microsiemens per centimeter at 25 degrees Celsius 

mg/L milligrams per liter

Water-year definition:

A water year is the 12-month period from October 1 through September 30. It is designated by the calendar year in which it ends.

Chemical concentration in water is reported in milligrams per liter (mg/L) or micrograms per liter (ng/L). Milligrams per liter is a unit 

expressing the solute mass (milligram) per unit volume (liter) of water and is about the same as parts per million unless concentrations are 

more than 7,000 milligrams per liter (Hem, 1989, p. 55). One thousand micrograms per liter is equivalent to 1 milligram per liter.

iv Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
WATER-QUALITY DATA (JULY 1994 THROUGH 

SEPTEMBER 1996) AND STATISTICAL SUMMARIES 

OF DATA FOR SURFACE WATER IN THE SAND 

COULEE COAL AREA, MONTANA

By Philip L Karper 

Abstract

Water was sampled from sites in abandoned coalmine areas in the drainages of Sand Coulee Creek and 

Belt Creek, southeast of Great Falls, to obtain baseline 

data for the evaluation of the effects of ongoing and 

future remedial activities. Water-quality and streamflow data were collected periodically at 27 sites during 

July 1994 through September 1996. Water-quality data 

include laboratory concentrations of major ions and 

trace elements, and field measurements of pH and specific conductance. Quality-assurance data and statistical summaries are reported for the analytical results.

INTRODUCTION

The Sand Coulee Coal Area of the Great Falls 

Coal Field lies southeast of Great Falls in Cascade 

County, Montana (fig. 1). Sand Coulee Creek and Belt 

Creek are two major drainages in this area. The study 

area lies within the Sand Coulee Coal Area in drainages 

of the heavily mined zones in the vicinity of Belt, Sand 

Coulee, Tracy, Centerville, and Stockett, Montana. 

Coal beds in the upper part of the Morrison Formation 

(Jurassic age) were first mined in 1876 (Fisher, 1909). 

Coal was extensively mined from about 1889 to 1930 

and most mines were abandoned by 1950. Acidic 

water containing high concentrations of metals has discharged from much of the mined area since abandonment of the underground coal mines.

The Mine Waste Cleanup Bureau of the Montana 

Department of Environmental Quality (formerly the 

Abandoned Mines Reclamation Bureau of the Montana 

Department of State Lands) has been active in reclamation of the study area since 1979. Considerable 

progress has been made in reclamation of mine dumps 

and documentation of sources of acid-mine drainage. 

Some progress also has been made on treatment of 

mine drainage. However, acid mine drainage into local 

streams continues to be a major water-quality problem 

in the area.

The Montana Department of Environmental 

Quality initiated a sampling program to develop a longterm database that can be used to detect trends over 

time in order to evaluate the effectiveness of remediation projects. As part of that program, water-quality 

data were collected by the U.S. Geological Survey 

(USGS) in cooperation with the Montana Department 

of Environmental Quality at selected sites.

Purpose and Scope

The purpose of this report is to present waterquality data for 27 sites in the abandoned coal-mine 

areas in the drainages of Sand Coulee Creek and Belt 

Creek collected from July 1994 through September 

1996. Quality-assurance data and statistical summaries 

for the data also are presented.

SAMPLING LOCATIONS AND TYPES OF 

DATA

Most of the sampling stations in the basins of 

Sand Coulee Creek (fig. 2) and Belt Creek (fig. 3) are 

outflows from mine adits where ground water discharges to the surface. At several sites the discharging 

ground water mixes with surface water only during 

periods of precipitation runoff. Several sites are 

located on streams, only one of which flows perennially. Others flow intermittently. Nine sites were sampled upstream and downstream of constructed 

wetlands which were developed as a remediation 

effort. Outflow was absent at several of the wetlands 

because of small inflows and evaporation of the ponded 

water. A list of stations and type and period of data 

collection are given in table 1.

Quality assurance of data was maintained through 

the use of documented procedures designed to provide 

environmentally representative data. Acceptable performance of the procedures was verified with qualitycontrol samples that were collected systematically to 

provide a measure of the accuracy, precision, and bias 

of the environmental data and to identify problems 

associated with sampling, processing, or analysis.

ABSTRACT 1
110040"

47°30' -

>, ueep Butte \ ~ MEAGHER \___*

47°101 -

Base from U.S. Geological Survey 

State base map, 1:500,000,1965 5 10 MILES 

I________I

10 KILOMETERS

Figure 1. Location of study area.

2 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
moos1 R.4E. R.5E. 111 °12

47°2S 

18

\\%17, 

Centerville\'5w1

Base modfled from U.S. Geological Survey 

Stockett, MT; l&ndnutequadrantfe, 1966.1:62,500 1MILE 

J

EXPLANATION 

SAMPLE SITE 

AND NUMBER

1 KILOMETER

Figure 2. Location of sampling sites in the Sand Coulee Creek basin, Montana.

SAMPLING LOCATIONS AND TYPES OP DATA 3
110°561 R.6 E. 55' 110054'

47°24' -

47°22 -

Base modified from U.S. Geological Survey 

Belt, MT; 15-miniite quadrangle, 1956,1:62,500

1MILE

EXPLANATION 

> SAMPLE SITE 

AND NUMBER

1 KILOMETER

Figure 3. Location of sampling sites in the Belt Creek basin, Montana.

CONTINUOUS STREAMFLOW DATA

Continuous streamflow records are available for 

five of the sampling sites for this project. Stream gages 

were located on four of the major drainages in the Sand 

Coulee Creek basin (sites 1-4) and on Anaconda drain 

in the Belt Creek basin (site 5). Flow was intermittent 

for the 2-year period that the stream gages were operated on Sand Coulee Creek, Cottonwood Creek, and 

Sand Coulee. Water flowed perennially at the gages on 

Number Five Coulee below Giffen Spring, near Stockett and Anaconda drain at Belt.

Discharge measurements were made periodically 

to develop stage-discharge relation ratings. These ratings were applied to the continuous stage records to 

compute daily mean discharges for each of the gaging 

stations according to methods described by Rantz and 

others (1982). Hydrographs for each of the five continuous streamflow-gaging stations are presented in figures 4-8.

WATER-QUALITY DATA

Water-quality data consist of measurements of 

physical properties and concentrations of chemical 

constituents analyzed in water samples. Samples were 

collected 25 times (approximately once-monthly) during the July 1994 through September 1996 period, 

except where sites were dry during the times of sampling visits. Site 7, Cottonwood Mine No. 6 drain to 

Cottonwood Creek near Stockett, was added in February 1995. Flow through the French Coulee wetland 

ponds was shut off and diverted in March 1996, after 

which samples were collected from French Coulee 

wetlands inflow No. 2 at Belt (site 12).

Methods

Because of the small flows and shallow depths at 

the sites, grab samples were collected using 2-liter 

acid-rinsed polyethylene bottles. Onsite measurements 

of specific conductance, water temperature, and pH 

were made during collection of periodic water-quality 

samples. Onsite sample filtration for dissolved

Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
Table 1 . Type and period of data collection at sampling sites in the Sand Coulee Coal Area, Montana

[Station number: Eight-digit numbers represent standard USGS numbering system for streamflow-gaging stations in downstream order. Fifteen-digit 

numbers represent approximate latitude and longitude of the site, plus a sequence number. Symbol: --, no data]

Site no. 

(«g. 2, 3)

1

2

3 

4

5

6

7

8

9

10

11

12

13 

14 

15 

16

17

18

19 

20

21 

22 

23 

24 

25 

26 

27

Station number

06078230 

06078250

06078260 

06078270

06090590

471851111111101 

472016111085701

472114111095001

472212111093301

472233110552601

472235110553201

472235110553202

472305110551701 

472306111103601 

472310110550801 

472313111104901

472330111082801

472331111083001

472334111104401 

472346111102401

472309110551201 

472446111085101 

472447111085301 

472513111082501 

472513111082901 

472514111082301 

472517111081001

Station name

Sand Coulee Creek above Cottonwood Creek, at Centerville 

Cottonwood Creek near Stockett

Number Five Coulee below Giffen Spring, near Stockett 

Sand Coulee at Sand Coulee

Anaconda drain at Belt

Giffen Spring near Stockett 

Cottonwood Mine No. 6 drain to Cottonwood Creek near Stockett

Cottonwood Mine No. 2 drain to Ladd Coulee at Stockett

Number Five Coulee near Stockett

French Coulee wetlands outflow at Belt

French Coulee wetlands inflow at Belt

French Coulee wetlands inflow No. 2 at Belt

Lewis Coulee above Castner Park, at Belt 

Mine drain to Mining Coulee near Sand Coulee 

Lewis Coulee above mine adit, at Belt 

Mine drain to Sand Coulee near Sand Coulee

Centerville wetlands inflow at Centerville

Centerville wetlands outflow at Centerville

Mount Oregon Mine drain to Kate's Coulee at Sand Coulee 

Nelson Mine drain to Sand Coulee at Sand Coulee

Lewis Coulee below mine adit, at Belt 

Pipe spring at Tracy 

Stock tank spring at Tracy 

Johnson Badwater Mine small wetlands inflow near Tracy 

Johnson Badwater Mine large wetlands inflow near Tracy 

Johnson Badwater Mine small wetlands outflow near Tracy 

Johnson Goodwater Mine small wetlands inflow near Tracy

Continuous 

record 

streamflow

10/94-09/96 

10/94-09/96

10/94-09/96 

10/94-09/96

10/94-09/96

~

~

~

~

~

~

~

-

~

-

Periodic 

water 

quality

07/94-09/96 

07/94-09/96

07/94-09/96 

07/94-09/96

07/94-09/96

07/94-09/96 

02/95-09/96

07/94-09/96

07/94-09/96

07/94-04/96

07/94-02/96

04/96-09/96

07/94-09/96 

07/94-09/96 

07/94-09/96 

07/94-09/96

07/94-09/96

07/94-09/96

07/94-09/96 

07/94-09/96

07/94-09/96 

07/94-09/96 

07/94-09/96 

07/94-09/96 

07/94-09/96 

07/94-09/96 

07/94-09/96

constituents was performed using a peristaltic pump, 

silicone tubing, and 0.45-(jm pore-size cartridge filters. Cross contamination of the filtered samples was 

prevented by rinsing the silicone tubing with 5-percent 

hydrochloric acid solution and deionized water and 

using a new cartridge filter for each sample. Nitric 

acid preservative was added onsite to the filtered samples. Vinyl gloves were worn during all sample-handling procedures. All field meters were calibrated 

onsite with standards and results were documented on 

standard USGS water-quality field forms. Instantaneous streamflow at the time of water sampling was

determined at all stations, except for several instances 

when the discharge could not be determined because 

reservoir outlets were not accessible. Flow values 

were determined either by direct measurement or from 

stage-discharge rating tables (Rantz and others, 1982).

Water samples were analyzed for the dissolved 

constituents listed in table 2 by the USGS National 

Water Quality Laboratory (NWQL) in Arvada, Colo. 

Analytical methods are described by Fishman and 

Friedman (1989) and Fishman (1993).

WATER-QUALITY DATA
3D

O

QJ

,o 

UJ 18

L_ 

O1 4

CO

O

 12

UJ 

C9

o tn

ONOjrnnnjjnsoNOjrnnnjjns

L

1994 1905 1936

Figure 4. Daily mean discharge for Sand Coulee Creek above Cottonwood Creek, at Centerville, Montana (site 1), water years 

1995-96. No flow occurred during several periods between October 1994 and September 1996.

20

o

o 

o

UJ tn

oz LJ

Q_

LJ 12

o

o

UJ 

CDft:

o

(O

. .t.t.

ONDjFMRMJJflSONDjrMflMjJRS 

1991 1995 19BB

Figure 5. Daily mean discharge for Cottonwood Creek near Stockett, Montana (site 2), water years 1995-96. No flow occurred 

during several periods between October 1994 and September 1996.

6 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water In the Sand Coulee Coal 

Area, Montana
15

O 

O 

LJtn

a: LJ 

o_

r. i 

LJ

LJ 

CD

a: 

a:

tn

1991 1995 1996

Figure 6. Daily mean discharge for Number Five Coulee below Giffen Spring, near Stockett, Montana 

(site 3), water years 1995-96.

o 

o LJ tn

LJ

Q_

,

LJ 3 

LO

m

CJ

LJ 

CD 

0?

cc

o tn

1994 1995 1996

Figure 7. Daily mean discharge for Sand Coulee at Sand Coulee, Montana (site 4), water years 1995-96. No flow occurred 

during several periods between October 1994 and September 1996.

WATER-QUALITY DATA
Q.5

O

z

O 

O 

LJ

LJ 

Q_

LJ Q.3 

L_

O * i 

OD

O

_ 0.2

LJ 

CD

o: 

a:

HZ 

O

cn

0.1

0.0

ONOJFMflMJJflSONOJFMflMJJRS 

1994 1995 1996

Figure 8. Daily mean discharge for Anaconda drain at Belt, Montana (site 5), water years 1995-96.

Results

Water-quality data for samples collected periodically during July 1994 through September 1996 are 

presented in table 3 (at the back of the report). The 

types of data include instantaneous streamflow, onsite 

measurements of water-quality properties, and analytical results for dissolved chemical constituents. Selenium analyses were discontinued in July 1995.

The field-determined pH for many samples was 

less than 4.5 units, below which alkalinity is negligible 

or absent. Because of the instability of acid-mine drain 

water, commonly having high concentrations of ferrous iron which can oxidize over time in the sample 

bottles, the pH measured weeks later by the NWQL 

would decrease and often be less than 4.5. Alkalinity 

for those samples was not reported by the NWQL. A 

value for alkalinity as well as uncensored (above detection limit) concentrations for common ions is required 

in the computer algorithm to calculate a value for dissolved-solids concentration. A value of 0.1 mg/L was 

substituted for alkalinity, chloride, and potassium for 

each sample which did not have a reported or uncensored value to perform the dissolved-solids concentration calculation. Alkalinity values for these samples 

are stored in the database as an estimated value of less 

than one (e<l). The dissolved-solids concentrations

for these samples are also qualified with an "e" (estimated).

Quality Assurance

Quality-assurance procedures used for the collection and field processing of water-quality samples are 

described by Horowitz and others (1994), Ward and 

Harr (1990), Edwards and Glysson (1988), Knapton 

and Nimick (1991), and Knapton (1985). Standard 

procedures used by the NWQL for internal sample handling and quality assurance are described by Friedman 

and Erdmann (1982), Jones (1987), and Pritt and Raese 

(1992).

The quality of analytical results reported for 

water-quality samples was evaluated by quality-control 

samples that were submitted from the field and analyzed concurrently in the laboratory with routine samples. These quality-control samples consisted of field 

replicates and blanks, which provide quantitative information on the precision and bias of the overall field and 

laboratory process. Each type of quality-control sample was submitted at a proportion equivalent to about 5 

percent of the total number of water-quality samples. 

Therefore, the total number of quality-control samples submitted from the field represented about 10 percent of the total number of water-quality samples.

Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
Table 2. Properties and dissolved constituents analyzed in water samples from sites in the 

Sand Coulee Coal Area, Montana

[Analytical methods are listed in parentheses to the right of property or constituent]

Physical or chemical property 

(analytical method)

Streamflow 

Specific conductance (meter) 

pH (meter) 

Temperature 

Acidity ^ET) 

Alkalinity ( 1 ET) 

Dissolved solids (calculated) 

Hardness (calculated)

Dissolved constituent1

Major ions 

(analytical method)

Calcium (2 ICP) 

Magnesium (2ICP) 

Sodium (2ICP) 

Potassium (2 ICP) 

Sulfate (3 IC) 

Chloride (3 IC) 

Fluoride (Colorimetry) 

Silica (2ICP)

Trace elements 

(analytical method)

Aluminum (4DCP) 

Arsenic (f AA) 

Barium (2ICP) 

Beryllium (2 ICP) 

Boron (4DCP) 

Cadmium (2 ICP/6GFAA) 

Chromium (2ICP) 

Cobalt (2ICP/6GFAA)

Copper

Iron (2ICP)

Lead (2ICP/6GFAA)

Lithium (2 ICP)

Manganese (2ICP)

Molybdenum (2ICP/6GFAA)

Nickel (2ICP)

Selenium (5AA)

Silver (2 ICP)

Strontium (2ICP)

Vanadium (2 ICP)

Zinc (2ICP)_________

All laboratory analytical methods are referenced from Fishman and Friedman, (1989).

Electrometric titration.

2Inductively-coupled argon radiofrequency plasma atomic emission spectrometry. 

3 Ion-exchange chromatography. 

4Direct-current argon radiofrequency plasma atomic emission spectrometry.

Atomic absorption spectrometry, hydride generation.

6Atomic absorption spectrometry, graphite fiimace. Analyses for the concentrations of cadmium, cobalt, lead, and 

molybdenum in samples for all sites collected from July to October 1994 were made by the ICP method. For samples 

from sites where high iron and aluminum concentrations caused matrix interference, the GFAA method was used for these 

constituents from November 1994 to September 1996.

In addition to quality-control samples submitted 

from the field, internal quality-assurance practices at 

the NWQL are performed systematically to provide 

quality control of analytical procedures (Pritt and 

Raese, 1992). These internal practices include analyses of quality-control samples such as calibration standards, standard reference water samples, replicate 

samples, deionized-water blanks, or spiked samples at 

a proportion equivalent to at least 10 percent of the 

sample load. The NWQL participates in a blindsample program in which standard reference water 

samples prepared by the USGS Branch of Technical 

Development and Quality Systems are routinely 

inserted into the sample line for each analytical method 

at a frequency proportional to the sample load. The 

laboratory also participates in external evaluation studies twice-yearly with the U.S. Environmental Protection Agency, the Canadian Center for Inland Water, and 

the Branch of Technical Development and Quality Systems to assess analytical performance.

Replicate samples are two or more samples considered to be essentially identical in composition. 

Analyses of replicate samples indicate the precision 

(reproducibility) of results. Precision is affected by 

numerous sources of variability within the field and 

laboratory environments, including sample collection, 

sample processing, and sample analysis. To provide 

data on precision for samples exposed to all sources of 

variability combined, replicate samples were obtained 

in the field by splitting a composite water sample. 

Analyses of these field replicates indicate the reproducibility of environmental data that are affected by both 

field and laboratory processes (sample splitting, filtration, preservation, transportation, and laboratory handling). Water-quality data for field replicates are listed 

in table 4 (at the back of the report).

Blank samples of deionized water were routinely 

analyzed to identify the presence and magnitude of 

contamination that potentially could bias analytical

WATER-QUALITY DATA 9
results. The particular type of blank sample routinely 

tested was a "field" blank. Field blanks are aliquots of 

deionized water that are certified as trace-element free 

and are processed through the sampling equipment 

used to collect water samples. These blanks are then 

subjected to the same processing and handling as 

stream samples. Blank samples are analyzed for the 

same constituents as those of water samples to identify 

whether any detectable concentrations were introduced 

from non-environmental sources. Water-quality data 

for field blanks are listed in table 5 (at the back of the 

report).

Most analytical results for blanks were below 

minimum reporting levels. Of the few detectable concentrations, occurrences were random and values generally were low, indicating no systematic contamination persistent in the process that would bias the 

results, with two possible exceptions. Occurrences of 

detectable concentrations of sulfate and silica were 

common enough and of sufficient magnitude to indicate possible low-level bias at sites where these constituents occur in low concentrations. Although not 

confirmed, a possible cause for detectable sulfate is 

carry-over contamination from samples having very 

high sulfate concentrations. The source of silica is 

uncertain, but may be partly attributed to borosilicate 

glass of the ampules containing the nitric acid preservative.

Most of the samples were representative of an 

acid-mine drainage matrix that contained very high 

concentrations of dissolved aluminum, iron, and sulfate. High concentrations of these constituents cause 

analytical interference that limits the ability to accurately quantify concentrations of other, less concentrated, constituents. To compensate for matrix 

interference, most samples were diluted prior to analysis to decrease the concentration of the interfering constituents and thus allow other constituents to be 

quantified. Dilution of samples, however, decreases 

the accuracy of analytical results, especially for lessconcentrated constituents. As concentrations of some 

of the less-concentrated constituents in the diluted sample aliquots recede to near the detection limit of the 

analysis, readings are apt to be less accurate and precise. These less-reliable readings are multiplied by the 

dilution factor, yielding potentially unreliable results 

for those constituents. Dilution of some sample aliquots also caused the concentration of some constituents to recede below the detection limit, yielding 

results reported as "less than minimum reporting 

level." Because the detection limit of the analysis 

increases proportionally with the dilution factor, the 

resulting censoring of the value may be at a considerably higher level than for an undiluted sample. For 

example, a two-fold dilution results in a doubling of the 

minimum reporting level. Greater dilutions result in a 

correspondingly greater increase in the minimum 

reporting level. This loss of resolution for low-level 

concentrations (most notably for chloride, fluoride, and 

several trace elements) may impair the ability to track 

changes over time or to assess concentrations relative 

to water-quality standards.

Lack of analytical accuracy and precision from 

matrix interference was suspected as the cause of large 

changes in some trace-metal concentrations in samples 

for several sites collected during the first few sampling 

trips. A decision was made to switch from the ICP 

(inductively-coupled argon radiofrequency plasma 

atomic emission spectrometry) method of analysis to 

the graphite furnace (atomic absorption spectrometry) 

method for cadmium, cobalt, lead, and molybdenum 

analyses for samples from sites where high iron and 

aluminum concentrations were present. More consistent values for these constituents appear to have 

resulted from this change. As a result, some of the values determined by the ICP method from July to October 1994 were considered unreliable.

Where matrix interference resulted in unreliable 

analytical results, questionable data were deleted if 

reruns and verification checks could not resolve the 

uncertainty. For three sites, chloride values were 

deleted entirely. More expensive custom sample preparation and analysis may be required to provide reliable 

quantification of low-level concentrations for selected 

constituents when matrix interference is extensive.

STATISTICAL SUMMARIES OF DATA

Statistical summaries of water-quality data are 

provided in table 6 for the period of record since 1994. 

Statistical summaries were computed for stations with 

five or more samples collected during the period of 

record. For one station, Site 15, Lewis Coulee above 

mine adit, at Belt, less than five samples were collected 

and no statistical summaries are computed. The summaries include the period of record; number of samples; and maximum, minimum, mean, and median 

concentrations.

SELECTED REFERENCES

Edwards, T.K., and Glysson, G.D., eds., 1988, Field methods 

for measurement of fluvial sediment: U.S. Geological 

Survey Open-File Report 86-531, 118 p.

10 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
Fisher, Cassius A., 1909, Geology of the Great Falls Coal 

Field, Montana: U.S. Geological Survey Bulletin 356, 

85 p.

Fishman, M.J., 1993, Methods of analysis by the U.S. 

Geological Survey National Water Quality 

Laboratory Determination of inorganic and organic 

constituents in water and fluvial sediments: U.S. 

Geological Survey Open-File Report 93-125,217 p.

Fishman, M.J., and Friedman, L.C., 1989, Methods for 

determination of inorganic substances in water and 

fluvial sediments: U.S. Geological Survey Techniques 

of Water-Resources Investigations, book 5, chap. Al, 

709 p.

Friedman, L.C., and Erdman, D.E., 1982, Quality assurance 

practices for the chemical and biological analyses of 

water and fluvial sediments: U.S. Geological Survey 

Techniques of Water-Resources Investigations, book 5, 

chap. A6,181 p.

Helsel, D.R., and Conn, T.A., 1988, Estimation of 

descriptive statistics for multiply censored water 

quality data: Water Resources Research, v. 24, no. 12, 

p. 1997-2004.

Hem, J.D., 1989, Study and interpretation of the chemical 

characteristics of natural water (3d ed.): U.S. 

Geological Survey Water-Supply Paper 2254,263 p.

Horowitz, A.J., Demas, C.R., Fitzgerald, K.K., Miller, T.L., 

and Rickert, D.A., 1994, U.S. Geological Survey 

protocol for the collection and processing of surfacewater samples for the subsequent determination of

inorganic constituents in filtered water: U.S. 

Geological Survey Open-File Report 94-539,57 p.

Jones, B.E., 1987, Quality control manual of the U.S. 

Geological Survey's National Water Quality 

Laboratory: U.S. Geological Survey Open-File Report 

87-457,17 p.

Knapton, J.R., 1985, Field guidelines for collection, 

treatment, and analysis of water samples, Montana 

District: U.S. Geological Survey Open-File Report 

85-409, 86 p.

Knapton, J.R., and Nimick, D.A., 1991, Quality assurance 

for water-quality activities of the U.S. Geological 

Survey in Montana: U.S. Geological Survey Open-File 

Report 91-216,41 p.

Pritt, J.W, and Raese, J.W., eds., 1992, Quality assurance/ 

quality control manual National Water Quality 

Laboratory: U.S. Geological Survey Open-File Report 

92-495,33 p.

Rantz, S.E., and others, 1982, Computation of discharge: 

U.S. Geological Survey Water-Supply Paper 2175,2 v., 

631 p.

Ward, J.R., and Harr, C.A., eds., 1990, Methods for 

collection and processing of surface-water and bedmaterial samples for physical and chemical analyses: 

U.S. Geological Survey Open-File Report 90-140,71 p.

SELECTED REFERENCES 11
DATA

12 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996

[Site number shown in figure 2 or 3. Abbreviations: frVs, cubic feet per second; °C, degrees Celsius; e, estimated; lab, laboratory; Hg/L, micrograms per liter; 

US/cm, microsiemens per centimeter at 25 °C; mg/L, milligrams per liter; ton/acre-ft, tons per acre-foot, ton/d, tons per day. Symbols: <, less than minimum 

reporting level; , no data]

SITE 1, 06078230--SAND COULEE CREEK ABOVE COTTONWOOD CREEK, AT CENTERVILLE, MT

Date

Jul 1994

19...

May 1995

16...

Jun

12...

Jul

12...

Aug

16...

Sep

13...

Oct

10...

Nov

27...

Jun 1996

03...

Jul

01...

Time

1845

1455

1500

1050

0845

1420

1530

1030

1445

1330

Streamflow, instantaneous 

(f&s)

0.39

15

20

24

6.3

3.4

2.4

.47

3.4

.21

Specific T T pH Hardconduc- JJJfJr" Jlure' onsite ness' 

tance, ni, ' water (stand- total 

onsite ,ol\ ,?}?\ ard (mg/L as 

(uS/cm) * **' ( ^' units) CaCO3)

399 27.0 25.0 8.3 190

322 19.0 17.5 8.0 160

377 28.0 22.0 8.2 190

336 17.0 14.5 8.3 170

485 16.0 15.5 8.5 250

469 23.0 20.5 8.7 240

442 17.0 10.5 8.8 230

475 -8.0 0.0 8.4 250

378 25.0 21.0 8.4 200

409 29.0 30.5 8.5 200

Calcium, "JJJJJf"

dis* dl«. '

Smn/i \ solved imy/Li /MMW/I \ " (mg/L)

39 23

44 12

52 15

45 14

63 23

56 24

50 25

59 25

55 16

42 22

Sodium, dissolved 

(mg/L)

5.9

3.3

4.0

3.7

5.2

5.5

5.4

5.9

3.7

5.6

Sodium adsorption 

ratio

0.2

.1

.1

.1

.1

.2

.2

.2

.1

.2

Date

Jul 1994

19...

May 1995

16...

Jun

12...

Jul

12...

Aug

16...

Sep

13...

Oct

10...

Nov

27...

Jun 1996

03...

Jul

01...

Potassium, 

dissolved 

(mg/L)

3.5

2.4

2.0

3.2

2.1

2.4

2.3

2.6

2.0

4.2

Acidity 

(mg/L as

<0.1

<.l

<.l

<.l

<.l

<.l

<.l

<.l

<.l

<.l

Alkalinity, Su^to, Chloride, Fluoride, J 

(mg/L as dissolved dissolved dissolved 

128 83 2.3 0.3

140 24 2.0 .3

169 28 1.5 .2

153 39 2.0 .2

208 52 2.1 .3

187 59 2.2 .6

164 62 2.4 .3

196 64 2.3 .5

157 41 1.5 .5

120 88 2.1 .4

Solids,

Silica, sum of 

ssolved consting/L as tuents, 

S1O2) dissolved

(mg/L)

3.2 238

11 184

10 215

11 210

11 284

6.6 270

3.8 251

3.7 282

8.8 223

3.3 241

Solids, 

dissolved 

(ton/ 

acre-ft)

0.32

.25

.29

.29

.39

.37

.34

.38

.30

.33

Solids, 

dissolved 

(ton/d)

0.25

7.54

11.6

13.6

4.84

2.47

1.62

.36

1.81

.14

TABLE 3 13
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 1, 06078230--SAND COULEE CREEK ABOVE COTTONWOOD CREEK, AT CENTERVILLE, MT-Continued

Date

Jul 1994

19...

May 1995 

16...

Jun

12...

Jul

12...

Aug 

16...

Sep 

13...

Oct

10...

Nov

27...

Jun 1996

03...

Jul

01...

Aluminum, 

dissolved

400

130

100

50

40

60

90

140

20

430

Arsenic, 

dissolved

2

<,

1

1

1

1

<1

<1

1

2

Barium, 

dissolved

150

150

180

150

210

190

160

170

150

160

Kf Boron, 

dissolved d'j^

<0.5 40

<.5 30

.5 20

<.5 20

<.5 30

<.5 50

<.5 40

<.5 30

<.5 20

<.5 40

Cad- Chromium, mlum, 

dissolved dissolved 

(ng/L) (ng/L)

<1 <5

<1 <5

1 <5

<1 <5

2 <5

<1 <5

<1 <5

<1 <5

<1 <5

<1 <5

Cobalt, 

dissolved

<3

<3

<3

<3

<3

<3

<3

<3

<3

<3

Copper, Iron, 

dissolved dissolved 

(lig/L) (M9A-)

<10 240

<10 81

<10 69

<10 57

<10 31

<10 23

<10 71

<10 58

<10 6

<10 57

Date

Jul 1994

19...

May 1995 

16...

Jun

12...

Jul

12...

Aug 

16...

Sep 

13...

Oct

10...

Nov

27...

Jun 1996

03...

Jul

01...

Lead, 

dissolved

<10

<10

<10

<10

<10

10

<10

<10

<10

<10

Lithium, 

dissolved

8

5

8

6

5

8

10

12

4

12

Manganese, 

dissolved

9

6

8

13

3

23

10

10

4

3

JJSJr Nickel, 

dffiKlved -Jgy-

<10 <10

10 <10

<10 <10

<10 <10

<10 20

<10 10

<10 <10

<10 <10

<10 <10

<10 <10

Selenium, Sliver, 

dissolved dissolved

<i <l

<i <l

<l <l

<i

<i

j

<l

<l

<i

<i

Strontium, 

dissolved (ng/L)

640

300

400

330

690

720

680

630

490

690

Vana- -gnc 

dissolved *5J-

<6 <3

<6 8

<6 <3

6 <3

<6 3

<6 4

<6 4

<6 5

<6 4

<6 <3

14 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996-Continued

SITE 2, 06078250--COTTONWOOD CREEK NEAR STOCKETT, MT

Date

Jul 1994

20...

May 1995

16...

Jun

13...

Jul

12...

Aug

15...

Sep

12...

Oct

11...

Nov

27...

May 1996

06...

Jun

03...

Jul

01...

Stream- Specific r~mnAr Tamnar PH» Har* r.i«i,.m Magne- c^ium 

flow, conduc- 12J5T' am,E onsite neas, CaSim> «ium, S°S^m> 

Time inatan- tance, "M ' fj" ' (stand- total °/*"H dis- J"*' 

taneoua onaite ,aJiv ,SS?r ard (mg/Laa iZZfTi solved 7°,«Jr? 

(f?/a) (nS/cm) (C) (C> unita) CaCO3) (m9/L> (mgA.) ^m9/L>

1725

1800

1640

1550

1340

1245

1200

1310

1300

1650

1450

0.09 874 25.0 21.0 8.0 440 90 53 13

17 656 19.0 16.5 7.5 320 71 34 10

5.2 825 25.0 20.0 6.9 410 88 45 13

5.5 887 20.0 16.0 7.0 450 100 48 12

1.0 1,210 24.0 15.0 4.2 490 100 57 13

.71 1,360 22.0 14.0 4.0 520 110 60 13

.48 1,330 18.0 9.5 4.2 570 120 65 13

.15 924 -5.0 0.0 7.7 510 110 57 12

.22 1,240 17.0 13.0 7.6 700 160 73 11

.23 1,080 25.0 18.5 8.2 570 120 66 12

.10 1,020 31.0 28.0 8.3 560 120 64 11

Sodium adsorption 

ratio

0.3

.2

.3

.2

.3

.2

.2

.2

.2

.2

.2

Date

Jul 1994

20...

May 1995

16...

Jun

13...

Jul

12...

Aug

15...

Sep

12...

Oct

11...

Nov

27...

May 1996

06...

Jun

03...

Jul

01...

Potassium, 

dissolved 

(mg/L)

4.0

4.2

3.4

4.1

3.5

3.7

4.0

3.8

4.4

4.7

5.0

Soiids, 

Acidity Alkf"nity' Sulfate, Chloride, Fluoride, ,,?""«, sumof Solids 

(mg^Laa (m^aa dissolved dissolved dissolved d([3jfjj gJJlJ (tSrJ

(mg/L) 8Cre~

<0.1 142 330 4.4 0.7 3.0 585 0.80

<.l 229 97 4.7 .5 6.4 366 .50

.2 80 320 4.0 .4 6.7 530 .72

<.l 56 390 4.6 .3 8.3 604 .82

5.7 e<l 780 5.2 .3 16 el,030 el.40

7.4 e<l 950 4.4 1.7 17 el, 180 el.60

7.7 e<l 860 4.6 1.5 17 el,150 el. 57

1.2 185 340 4.3 .6 6.2 646 .88

<.l 153 550 5.6 .8 3.5 901 1.23

.1 205 370 5.0 .7 2.6 705 .96

<.l 206 350 4.0 .8 2.9 683 .93

Solids, 

dissolved 

(ton/d)

0.14

16.8

7.44

8.97

e2.77

e2.26

el. 50

.26

.54

.44

.18

TABLE 3 15
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 2, 06078250--COTTONWOOD CREEK NEAR STOCKETT, MT-Continued

Date

Jul 1994

20...

May 1995

16...

Jun

13...

Jul

12...

Aug

15...

Sep

12...

Oct

11...

Nov

27...

May 1996

06...

Jun

03...

Jul

01...

Aluminum, 

dissolved 

(WJ/L)

460

90

60

20

41,000

6,100

54,000

70

210

<10

1,200

Arsenic, 

dissolved

<1

<1

<1

3

<1

<1

<1

<1

<1

<1

<1

Barium, 

dissolved

110

130

220

180

210

190

180

55

24

48

49

Beryllium, 

dissolved 

(MI/L)

<0.5

<.5

<.5

<.5

10

12

11

<.5

<.5

<.5

<.5

Boron, 

dissolved 

(M9A)

120

50

60

60

100

110

90

60

80

80

100

Cad- Chromium, mium, 

dissolved dissolved 

(MQ/L) Oig/L)

<1 <5

<1 <5

5 <5

2 <5

11 <5

8 <5

5 <5

<l <5

<1 <5

<1 <5

2 <5

Cobalt, 

dissolved 

(M9/D

40

6

140

190

--

560

--

50

60

30

20

Copper, 

dissolved

<10

<10

<10

<10

50

50

30

<10

<10

<10

<10

Iron, 

dissolved

6

4

130

830

5,300

2,900

7,400

5

<3

<3

<3

Date

Jul 1994

20...

May 1995

16...

Jun

13...

Jul

12...

Aug

15...

Sep

12...

Oct

11...

Nov

27...

May 1996

06...

Jun

03...

Jul

01...

Lead, 

dissolved 

(H9/L)

<10

<10

<10

<10

<10

<10

<10

<10

<10

<10

<10

Lithium, 

dissolved 

(M9/L)

43

16

46

58

96

110

110

30

46

38

33

Manganese, 

dissolved 

(WI/L)

100

25

200

380

380

430

420

69

150

89

50

Molybdenum, 

dissolved 

(H9/L)

<10

<10

<10

<10

<10

<10

<10

<10

<10

<10

<10

Nickel, 

dissolved 

(M9/L)

70

20

230

310

810

1,000

1,000

80

120

50

30

Selenium, Silver, 

dissolved dissolved 

(ug/L) 0*9/1-)

<l <l

<l 1

<l <l

<i <i

_ <i

 l

~ <l

<l

<i

_ <i

<i

Strontium, 

dissolved 

(M9/L)

360

300

380

380

440

450

480

370

450

440

440

Vanadium, 

dissolved 

(M9/D

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

Zinc, 

dissolved

8

12

210

530

3,700

4,400

4,800

68

22

12

7

16 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 3, 06078260--NUMBER FIVE COULEE BELOW GIFFEN SPRING, NEAR STOCKETT, MT

Date

Jul 1994

21...

Aug

17...

Sep

06...

Oct

13...

Nov

14...

Dec

15...

Jan 1995

11...

Feb

21...

Mar

16...

Apr

11...

May

16...

Jun

12...

Jul

12...

Aug

15...

Sep

12...

Oct

11...

Nov

28...

Jan 1996

10...

Feb

20...

Apr

02...

May

06...

Jun

04...

Jul

01...

Aug

06...

Sep

03...

Time

0825

0840

1445

1620

1320

1135

0955

1505

1305

1500

1835

1845

1730

1030

1020

1000

0840

1300

1230

1300

1020

1430

1600

1110

1000

Streamflow, instantaneous 

(f&s)

0.88

.77

.87

.76

.72

.70

.60

.64

.62

.67

7.5

6.4

8.3

2.8

1.9

1.5

1.2

.88

.70

.86

.83

.88

.78

.69

.61

Specific conductance, 

onsite 

(fiS/cm)

1,080

1,200

1,180

1,180

1,210

1,180

1,190

1,170

1,160

1,170

727

737

121

919

1,040

1,140

1,190

1,250

1,250

1,230

1,170

1,040

1,100

1,110

1,150

Temperature, 

air (°C)

17.0

17.0

29.5

14.0

6.0

4.0

7.0

18.0

9.0

12.0

15.0

24.0

18.0

17.0

15.0

11.0

-1.0

6.0

9.0

8.0

8.0

21.0

31.0

18.0

15.0

Temperature, 

water (°C)

10.0

9.5

13.0

9.5

7.5

6.5

7.5

9.5

10.0

10.5

16.5

18.0

14.5

11.0

10.0

8.5

5.5

6.5

7.5

9.0

8.5

15.0

16.0

11.0

9.5

PH, 

onsite (standard 

units)

6.4

6.5

6.0

6.7

6.3

6.2

6.4

6.4

6.7

6.6

7.3

7.9

7.5

7.0

6.5

6.5

6.5

6.0

6.2

6.1

6.5

6.6

6.3

6.2

6.5

Hardness, 

total 

(mg/Las 

CaC03)

510

540

540

530

560

550

530

530

530

550

330

360

360

440

510

520

570

600

600

590

560

510

510

550

530

Calcium, dissolved 

<mg/L)

130

140

140

140

150

150

140

140

140

150

74

83

80

110

130

130

150

160

160

160

150

130

130

140

140

Magnesium, dissolved 

(mg/L)

46

46

46

44

45

43

44

43

43

43

36

37

38

41

44

48

48

49

49

46

45

46

45

48

44

Sodium, dissolved 

(mg/L)

18

17

16

16

16

14

15

15

16

15

20

18

19

16

16

17

16

15

15

15

15

19

16

15

15

Sodium adsorption 

ratio

0.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.5

.4

.4

.3

.3

.3

.3

.3

.3

.3

.3

.4

.3

.3

.3

TABLE 3 17
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 3, 06078260--NUMBER FIVE COULEE BELOW GIFFEN SPRING, NEAR STOCKETT, MT--Continued

Date

Jul 1994

21...

Aug

17...

Sep

06...

Oct

13...

Nov

14...

Dec

15...

Jan 1995

11...

Feb

21...

Mar

16...

Apr

11...

May

16...

Jun

12...

Jul

12...

Aug

15...

Sep

12...

Oct

11...

Nov

28...

Jan 1996

10...

Feb

20...

Apr

02...

May

06...

Jun

04...

Jul

01...

Aug

06...

Sep

03...

Potassium, 

dissolved 

(mg/L)

5.2

5.5

6.1

6.2

5.9

5.9

5.8

4.9

5.1

5.8

5.3

4.1

4.4

4.1

5.7

5.7

5.3

7.0

5.9

5.5

6.1

5.7

5.9

6.5

5.7

Acidity

0.4

3.2

1.7

0.9

1.5

1.5

1.3

.8

1.5

.6

<.l

<.l

<.l

<.l

<.l

.5

1.1

2.1

1.6

1.1

.3

<.l

.6

.6

.5

Alkalinity, 

lab 

(mg/L as 

CaC03)

7.9

e<l

e<l

e<l

e<l

e<l

e<l

e<l

e<l

4.4

257

252

252

148

67

27

e<l

e<l

e<l

e<l

2.3

5.6

5.6

4.0

e<l

Sulfate, 

dissolved 

(mg/L)

570

670

720

650

670

630

610

680

590

660

110

130

140

380

500

560

700

790

680

700

680

570

680

630

600

Chloride, 

dissolved 

(mg/L)

3.9

3.8

3.4

3.8

3.4

3.3

3.4

4.5

3.8

4.6

5.0

4.0

4.5

3.6

4.3

4.7

3.8

5.6

3.9

4.5

5.6

7.3

4.3

5.3

5.2

Ruorlde, 

dissolved 

(mg/L)

0.6

.2

.3

.5

-

<.5

.7

.2

.3

.3

.6

.6

.5

.6

.3

.4

1.2

1.3

.2

.8

.8

.9

.8

.7

.8

Silica, 

dissolved "fe"

14

14

15

14

14

15

14

14

14

13

9.2

8.3

11

10

11

13

14

17

15

15

13

11

13

13

14

Solids, 

sum of constituents, 

dissolved 

(mg/L)

842

e956

el,010

e928

e965

e919

e885

e950

e860

935

415

437

450

661

771

833

e944

el, 110

e987

el, 000

958

844

934

898

e868

Solids, 

dissolved 

(ton/ 

acre-ft)

1.14

el.30

e,1.37

el. 26

el. 31

el. 25

el. 20

el. 29

el. 17

1.27

.56

.59

.61

.90

1.05

1.13

el.35

el.51

el .34

el.36

1.30

1.15

1.27

1.22

el. 18

Solids, 

dissolved 

(ton/d)

2.00

el .99

e2.37

el. 91

el. 88

el.74

el .43

el .64

el. 44

1.69

8.41

7.56

10.1

5.00

3.96

3.33

e3.22

e2.65

el.87

e2.33

2.15

2.01

1.97

1.67

el. 43

18 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 3, 06078260-NUMBER FIVE COULEE BELOW GIFFEN SPRING, NEAR STOCKETT, MT--Continued

Date

Jul 1994

21...

Aug

17...

Sep

06...

Oct

13...

Nov

14...

Dec

15...

Jan 1995

11...

Feb

21...

Mar

16...

Apr

11...

May

16...

Jun

12...

Jul

12...

Aug

15...

Sep

12...

Oct

11...

Nov

28...

Jan 1996

10...

Feb

20...

Apr

02...

May

06...

Jun

04...

Jul

01...

Aug

06...

Sep

03...

Aluminum, 

dissolved

60

190

160

170

310

290

220

150

130

60

60

70

30

30

50

70

140

400

220

100

50

30

30

20

40

Arsenic, Barium, 

dissolved dissolved

<1 48

<1 40

<1 35

<1 32

<1 26

<1 22

<1 22

<1 22

<1 22

<1 22

<1 140

<1 210

<1 170

<1 120

<2 87

<1 70

<1 50

<2 39

<1 35

<1 34

<1 32

<1 46

<1 35

<1 28

<1 25

Mum'" Boron, 

disced ''J^f

<0.5 80

<.5 90

1 100

.5 90

1 100

1 90

1 90

1 80

1 80

.7 80

<.5 50

<.S 50

<.5 60

<.5 60

<.5 80

<.5 80

<.5 80

.9 80

.9 90

.6 . 90

1 80

<.5 60

<.5 60

1 70

.9 60

Cadmium, 

dissolved 

(ug/L)

6

13

14

5

9

3

9

2

2

2

<I

<1

<1

1

3

3

4

5

4

3

2

1

2

2

2

Chromium, 

dissolved 

(MI/L)

<5

<5

<5

<5

<5

<5

<5

<5

<5

<5

<5

<5

<5

<5

<5

<5

<5

<5

<5

<5

<5

<5

<5

<5

<5

Cobalt, 

dissolved 

(ng/L)

330

150

270

260

270

410

300

170

180

150

10

20

20

100

140

190

230

250

290

220

200

160

170

160

190

Copper, Iron, 

dissolved dissolved

<10 46,000

<10 55,000

<10 57,000

<10 50,000

<10 56,000

<10 53,000

<10 48,000

<10 45,000

<10 44,000

<10 38,000

<10 430

<10 340

<10 390

<10 5,600

<10 17,000

<10 35,000

<10 51,000

<10 63,000

<10 53,000

<10 50,000

<10 38,000

<10 18,000

<10 33,000

<10 34,000

<10 40,000

TABLE 3 19
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 3, 06078260--NUMBER FIVE COULEE BELOW GIFFEN SPRING, NEAR STOCKETT, MT-Continued

Date

Jul 1994

21...

Aug

17...

Sep

06...

Oct

13...

Nov

14...

Dec

15...

Jan 1995

11...

Feb

21...

Mar

16...

Apr

11...

May

16...

Jun

12...

Jul

12...

Aug

15...

Sep

12...

Oct

11...

Nov

28...

Jan 1996

10...

Feb

20...

Apr

02...

May

06...

Jun

04...

Jul

01...

Aug

06...

Sep

03...

Lead, Lithium, 

dissolved dissolved 

(ug/L) (ug/L)

<10 59

<10 66

<10 69

<10 65

<10 68

<10 67

<10 68

<1 62

<1 68

<1 63

<1 26

<1 24

<1 11

<1 36

<1 47

<1 54

<1 61

<1 69

<1 62

<1 66

<1 59

<1 55

<1 58

<1 67

<1 67

Manganese, 

dissolved 

(ug/L)

740

850

800

830

930

920

870

820

780

860

130

170

180

490

740

890

990

1,300

1,300

1,200

930

730

730

870

830

^In'nm Nickel, Selenium, Silver, 

HIC " , 'H dissolved dissolved dissolved oSt? (ug/L) ^g/L) ^g/L)

<10 320 <1 <1

<10 340 <1

<10 360 <1 <1

<10 310 <1 <1

<10 340 <1 <1

<10 330 <1 <1

<10 320 <1 <1

<1 290 <1 <1

<1 280 <1 <1

<1 260 <1 <1

1 30 1 <1

<1 30 <1 <1

<1 30 -- <1

<1 150 - <1

<1 250 - 1

<1 310 -- <1

<1 380 -- <1

<1 470 - <1

<1 430 - 2

<1 400 -- <1

<1 330 - <1

<1 260 - <1

1 290 -- <1

<1 290 - <1

<1 320 -- . <1

Strontium, 

dissolved 

(ug/L)

370

390

380

360

380

370

390

380

380

380

290

320

300

330

340

370

390

430

390

400

380

380

360

360

370

Vanadium, 

dissolved (ug/L)

<6

12

10

9

9

9

8

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

Zinc, 

dissolved 

(ug/L)

1,100

1,300

1,400

1,200

1,400

1,300

1,200

1,000

1,000

900

30

50

60

380

750

1,100

1,500

1,900

1,700

1,500

1,200

750

1,000

1,100

1,100

20 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued)

SITE 4, 06078270--SAND COULEE AT SAND COULEE, MT

Date

Jul 1994

20...

Aug

17...

Sep

06...

Oct

13...

Apr 1995

12...

May

16...

Jun

13...

Jul

11...

Aug

16...

Sep

13...

Oct

10...

Jun 1996

04...

Jul

02...

*X£r IS5IE *g» **» JSL iS£

Time instan- tance, "M ' *" ?; (stand- total 

taneous onsite «Ji» /°r\ ard (mg/Las 

(fF/s) (nS/cm) ( * ' * **> units) CaCO3)

1200

1010

1700

1035

1150

1220

1150

1430

1010

1000

1650

1550

0820

0.03

.02

.008

.005

.05

2.5

1.1

.62

.18

.17

.15

.14

.03

4,770

4,660

5,460

4,770

3,930

1,020

1,730

2,470

4,880

4,750

4,650

2,750

3,270

25.0 30.0 2.6 1,300

21.0 17.0 2.6 1,200

31.0 20.5 2.2 1,400

6.0 3.0 2.8 1,200

15.0 11.5 2.6 1,200

17.0 19.0 6.1 480

25.0 24.0 4.2 630

18.0 17.0 3.9 720

19.0 19.0 2.7 1,200

15.0 11.5 2.7 1,200

18.0 13.0 2.7 1,200

24.0 23.0 2.7 890

18.0 14.5 2.8 940

 °£m> "sSmT dls- d|8.'

f««n^ solved <m9/L> (mg/L)

240 160

220 160

250 180

230 160

240 140

86 65

110 85

130 96

220 160

220 160

220 160

160 120

180 120

Sodium, dissolved 

(mg/L)

25

24

26

22

23

16

20

20

23

24

24

23

22

Sodium adsorption 

ratio

0.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

Date

Jul 1994

20...

Aug

17...

Sep

06...

Oct

13...

Apr 1995

12...

May

16...

Jun

13...

Jul

11...

Aug

16...

Sep

13...

Oct

10...

Jun 1996

04...

Jul

02...

Potassium, 

dissolved 

(mg/L)

2.7

3.0

3.0

2.6

2.5

7.1

3.5

3.4

2.9

2.2

2.8

3.8

2.6

Acidity 

(mg/Las

31

77

84

78

38

<.l

11

26

77

84

79

22

33

Alkalinity, 

lab 

(mg/Las 

CaC03)

e<l

e<l

e<l

e<l

e<l

13

e<l

e<l

e<l

e<l

e<l

e<l

e<l

Sulfate, Chloride, Fluoride, H 

dissolved dissolved dissolved , 

(mg/L) (mg/L) (mg/L) *

4,500 7.7 0.2

4,800 6.3 <.l

6,800 3.8 .2

5,900 3.1 2.4

4,200 8.6 1.8

470 11 .2

1,700 8.5 1.7

2,400 7.1 1.2

5,800 21

5,800 8.2 .2

5,100 4.3 1.9

2,100 9.6 1.0

2,700 7.1 .7

Solids,

Silica, sum of 

issolved constimg/L as tuents, 

S1O2) dissolved

(mg/L)

78 e5,810

77 e6,190

86 e8,290

79 e7,370

50 e5,030

9.9 683

26 e2,120

39 e3,080

81 e7,370

84 e7,410

81 e6,530

42 e2,660

57 e3,440

Solids, 

dissolved 

(ton/ 

acre-ft)

e7.90

e8.42

ell.3

el 0.0

e6.85

.93

e2.88

e4.18

elO.O

elO.l

e8.88

e3.62

e4.68

Solids, 

dissolved 

(ton/d)

eO.47

e.33

e.18

e.10

e.68

4.61

e6.30

e5.15

e3.58

e3.40

e2.64

el.Ol

e.28

TABLE 3 21
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 4, 06078270--SAND COULEE AT SAND COULEE, MT--Continued

Date

Jul 1994

20...

Aug

17...

Sep

06...

Oct

13...

Apr 1995

12...

May

16...

Jun

13...

Jul

11...

Aug

16...

Sep

13...

Oct

10...

Jun 1996

04...

Jul

02...

Aluminum, 

dissolved 

(ng/L)

410,000

410,000

490,000

470,000

230,000

30

73,000

170,000

440,000

480,000

420,000

130,000

190,000

Arsenic, 

dissolved 

<ng/D

4

6

4

7

<1

<1

<1

3

7

11

6

<1

2

Barium, 

dissolved 

<H9/L)

9

7

6

6

8

120

120

88

<10

13

40

69

11

Beryllium, 

dissolved 

(ng/L)

49

49

57

52

30

<.5

11

19

56

60

52

19

26

Boron, 

dissolved 

(H9/L)

430

420

490

440

250

80

140

190

460

440

440

210

200

Cadmium, 

dissolved 

(H9/L)

-

34

19

-

27

2

9

15

47

49

48

16

21

Chromium, 

dissolved 

fog/I-)

110

120

130

120

50

<5

<5

20

150

160

130

40

60

Cobalt, 

dissolved 

(H9/L)

2,600

3,000

2,000

2,900

1,000

110

270

520

1,400

1,600

1,500

600

790

Copper, 

dissolved 

(ug/L)

110

110

130

130

70

<10

20

<30

130

160

130

-

<80

Iron, 

dissolved 

(ng/L)

360,000

470,000

430,000

480,000

120,000

7,700

86,000

200,000

600,000

600,000

490,000

64,000

150,000

Date

Jul 1994

20...

Aug

17...

Sep

06...

Oct

13...

Apr 1995

12...

May

16...

Jun

13...

Jul

11...

Aug

16...

Sep

13...

Oct

10...

Jun 1996

04...

Jul

02...

Lead, 

dissolved 

(H9/L)

<10

<10

<10

<10

<1

<1

<1

<1

<1

<1

<1

2

1

Lithium, 

dissolved 

(WL)

630'

630

700

610

430

85

190

260

630

640

650

280

380

Manganese, 

dissolved 

(U9/L)

4,000

4,100

4,900

4,700

4,100

450

1,100

2,000

4,400

4,100

3,700

2,000

2,600

Molybdenum, 

dissolved 

<ug/L)

<10

<10

<10

<10

<1

2

<1

<1

<1

<1

1

<1

<1

Nickel, 

dissolved 

(US/L)

2,800

2,800

3,200

2,900

2,100

240

750

1,200

3,000

3,400

3,300

1,100

1,600

Selenium, 

dissolved 

(ug/L)

<2

<5

<5

<2

<1

1

<1

-

-

-

-

-

-

Silver, 

dissolved 

(ng/L)

<l

<3

<3

<5

<3

<1

<1

<3

<10

<6

<5

<4

<10

Strontium, 

dissolved 

(ug/L)

1,300

1,300

1,400

1,200

1,100

530

730

780

1,300

1,300

1,300

930

950

Vanadium, 

dissolved 

Oxg/L)

70

130

97

120

<6

<6

<6

<18

100

60

57

<24

<48

Zinc, 

dissolved 

(ug/L)

11,000

11,000

12,000

12,000

8,600

420

3,000

4,800

12,000

14,000

13,000

4,800

6,800

22 Water-Quality Data (July 1994 through September 1998) and Statistical Summaries of Data for Surface Water In the Sand Coulee Coal 

Area, Montana
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana July 1994 through September 1996 (Continued)

SITE 5, 06090590--ANACONDA DRAIN AT BELT, MT

Date

Jul 1994

19...

Aug

17...

Sep

06...

Oct

14...

Nov

14...

Dec

15...

Jan 1995

12...

Feb

22...

Mar

16...

Apr

12...

May

17...

Jun

13...

Jul

13...

Aug

17...

Sep

14...

Oct

12...

Nov

29...

Jan 1996

12...

Feb

21...

Apr

04...

May

07...

Jun

05...

Jul

03...

Aug

08...

Sep

04...

Time

1535

1510

1030

0955

1110

1525

1010

0820

0935

1745

0825

0940

0920

1100

1100

1145

1200

1010

1100

1330

1610

1230

0840

1050

1010

Streamflow, instantaneous 

(ffrs)

0.17

.18

.21

.22

.20

.20

.22

.21

.22

.24

.28

.29

.28

.28

.26

.22

.19

.16

.15

.20

.24

.23

.19

.24

.23

Specific conductance, 

onsite 

(liS/cm)

2,460

2,420

2,380

2,400

2,420

2,440

2,390

2,400

2,370

2,380

2,300

2,290

2,310

2,330

2,390

2,420

2,430

2,340

2,380

2,440

2,350

2,280

2,340

2,440

2,460

Temperature, 

air (°C)

24.0

30.0

22.0

7.0

6.0

3.5

2.0

7.0

6.0

12.0

16.0

22.5

17.0

20.0

20.0

6.5

9.0

9.0

10.0

9.0

14.0

18.0

21.0

21.0

11.0

Temperature, 

water (°C)

16.5

18.5

14.0

9.5

9.0

6.5

8.0

8.0

10.0

12.0

12.0

15.0

14.0

15.5

14.0

10.0

8.5

7.5

11.0

14.0

14.5

17.5

14.0

16.0

13.0

PH, 

onsite (standard 

units)

2.9

3.0

2.9

2.9

3.0

3.0

3.0

3.0

2.9

2.9

2.8

2.9

3.0

3.0

3.0

2.9

3.0

2.9

3.0

2.8

2.9

2.8

2.8

2.9

3.0

Hardness, 

total 

(mg/L as 

CaC03)

680

670

670

680

710

690

720

670

680

640

640

640

640

610

640

650

660

690

680

680

650

660

720

660

690

Calcium, dissolved 

(mg/L)

160

160

160

160

170

170

170

160

160

150

150

150

150

140

150

150

150

160

160

160

150

150

170

150

160

Magnesium, dissolved 

(mg/L)

68

66

66

67

68

64

71

65

67

63

64

65

63

63

65

67

68

69

67

68

66

68

72

68

69

Sodium, dissolved 

(mg/L)

9.7

9.8

10

9.5

10

9.4

10

9.6

10

9.6

9.8

10

10

9.7

10

9.7

9.8

10

10

11

10

10

11

10

10

Sodium adsorption 

ratio

0.2

.2

.2

.2

.2

.2

.2

.2

.2

.2

.2

.2

.2

.2

.2

.2

.2

.2

.2

.2

.2

.2

.2

.2

.2

TABLE 3 23
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana July 1994 through September 1996 (Continued)

SITE 5, 06090590-ANACONDA DRAIN AT BELT, MT«Continued

Date

Jul 1994

19...

Aug

17...

Sep

06...

Oct

14...

Nov

14...

Dec

15...

Jan 1995

12...

Feb

22...

Mar

16...

Apr

12...

May

17...

Jun

13...

Jul

13...

Aug

17...

Sep

14...

Oct

12...

Nov

29...

Jan 1996

12...

Feb

21...

Apr

04...

May

07...

Jun

05...

Jul

03...

Aug

08...

Sep

04...

Potassium, 

dissolved 

(mg/L)

3.2

3.7

3.4

3.2

3.1

3.3

3.0

2.9

3.0

3.2

2.6

2.5

2.6

2.7

2.7

2.7

2.6

3.1

3.1

2.8

2.9

2.8

3.1

3.5

3.1

Acidity 

(m?/L.,

22

22

21

20

22

22

23

21

21

19

19

18

18

20

20

23

22

21

23

24

22

21

21

25

23

Alkalinity, Su|fate> 

/mn/i *« dissolved (cS£bl) <m^>

e<l 1,800

e<l 1,900

e<l 1,800

e<l 1,900

e<l 1,900

e<l 1,900

e<l 1,800

e<l 2,700

e<l 1,800

e<l 2,000

e<l 1,900

e<l 1,700

e<l 2,000

e<l 2,100

e<l 1,700

e<l 1,900

e<l 1,900

e<l 2,000

e<l 2,000

e<l 2,400

e<l 2,000

e<l 2,400

e<l 1,700

e<l 1,900

e<l 1,900

Chloride, 

dissolved 

(mg/L)

2.6

6.0

5.6

7.4

3.2

2.3

2.4

6.3

6.4

5.4

7.9

3.9

2.3

7.6

2.7

2.5

2.2

7.1

2.5

4.8

4.8

4.5

2.7

4.5

4.9

Fluorlde, 

dissolved 

(mg/L)

-

-

0.8

1.3

2.0

.6

2.1

2.7

2.2

1.7

2.4

.9

.6

1.4

1.7

1.5

1.6

1.3

1.9

2.1

1.9

1.9

.9

2.2

2.0

Silica, 

dissolved 

(mg/L as

57

56

57

60

57

59

58

56

56

51

53

54

56

56

57

58

57

60

59

59

56

53

59

54

55

Solids, 

sum of constituents, 

dissolved 

(mg/L)

e2,400

e2,490

e2,400

e2,480

e2,510

e2,500

e2,400

e3,290

e2,390

e2,540

e2,440

e2,240

e2,530

e2,650

e2,280

e2,490

e2,490

e2,620

e2,600

e3,030

e2,580

e2,970

e2,300

e2,470

e2,490

Solids, 

dissolved 

(ton/ 

acre-ft)

e3.26

e3.39

e3.26

e3.37

e3.41

e3.40

e3.27

e4.47

e3.25

e3.46

e3.32

e3.04

e3.45

e3.60

e3.10

e3.39

e3.39

e3.56

e3.54

e4.11

e3.51

e4.04

e3.13

e3.36

e3.39

Solids, 

dissolved 

(ton/d)

el. 10

el.2l

el.36

el. 47

el.36

el.35

el. 43

el.87

el. 42

el.65

el.85

el.75

el. 92

e2.00

el. 60

el. 48

el. 28

el. 13

el. 05

el. 63

el.67

el. 84

el. 18

el. 60

el.55

24 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana July 1994 through September 1996 (Continued)

SITE 5, 06090590--ANACONDA DRAIN AT BELT, MT--Continued

Date

Jul 1994

19...

Aug

17...

Sep

06...

Oct

14...

Nov

14...

Dec

15...

Jan 1995

12...

Feb

22...

Mar

16...

Apr

12...

May

17...

Jun

13...

Jul

13...

Aug

17...

Sep

14...

Oct

12...

Nov

29...

Jan 1996

12...

Feb

21...

Apr

04...

May

07...

Jun

05...

Jul

03...

Aug

08...

Sep

04...

Aluminum, 

dissolved 

(H9/I-)

110,000

110,000

110,000

100,000

li 0,000

110,000

100,000

110,000

110,000

100,000

95,000

94,000

92,000

100,000

110,000

110,000

110,000

120,000

110,000

120,000

110,000

100,000

110,000

100,000

110,000

Arsenic, 

dissolved 

(H9/I-)

1

1

2

1

1

1

1

<1

1

1

1

<1

3

1

<2

1

<1

<2

2

3

3

<1

2

2

2

Barium, 

dissolved 

(H9/L)

<3

3

<3

<3

<3

4

4

<3

<3

<3

10

3

<3

<2

2

11

11

12

10

11

9

10

3

11

11

Beryllium, 

dissolved 0»g/L)

20

17

18

18

17

17

19

17

17

16

17

15

15

17

18

16

17

18

17

18

20

16

19

23

18

Boron, 

dissolved (ng/L)

170

180

170

170

160

170

150

150

160

160

130

140

140

150

160

180

150

150

150

140

150

320

80

110

60

Csdmium, 

dissolved 

(H9/L)

-

--

13

-

-

-

11

7

8

8

8

8

8

9

9

10

9

9

9

8

9

8

10

8

8

Chromium, 

dissolved (ng/L)

50

50

40

40

50

40

50

40

40

40

40

30

40

40

40

50

40

50

50

50

50

40

40

50

40

Cobalt, 

dissolved 

(H9/L)

-

--

390

-

470

-

500

310

350

330

310

280

290

370

350

360

310

310

310

360

310

330

330

360

350

Copper, 

dissolved (ng/L)

40

<30

<30

<30

<30

<30

<30

<30

30

30

40

40

<30

30

30

40

30

<30

30

20

<30

<30

30

<30

<30

Iron, 

dissolved (ng/L)

180,000

170,000

180,000

160,000

180,000

170,000

180,000

170,000

170,000

150,000

150,000

150,000

150,000

160,000

170,000

180,000

180,000

180,000

180,000

190,000

170,000

150,000

170,000

170,000

170,000

TABLE 3 25
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana July 1994 through September 1996 (Continued)

SITE 5, 06090590-ANACONDA DRAIN AT BELT, MT-Continued

Date

Jul 1994

19...

Aug

17...

Sep

06...

Oct

14...

Nov

14...

Dec

15...

Jan 1995

12...

Feb

22...

Mar

16...

Apr

12...

May

17...

Jun

13...

Jul

13...

Aug

17...

Sep

14...

Oct

12...

Nov

29...

Jan 1996

12...

Feb

21...

Apr

04...

May

07...

Jun

05...

Jul

03...

Aug

08...

Sep

04...

Lead, 

dissolved

<30

<30

<30

<30

<30

<30

<30

1

1

<1

<1

<1

<1

1

<1

<1

1

<1

2

1

1

1

<1

1

<2

Lithium, 

dissolved 

(ng/L)

200

200

200

180

210

190

210

210

200

180

190

180

180

170

180

190

200

190

200

210

200

180

190

200

210

Manganese, 

dissolved (ng/L)

430

430

430

420

450

440

440

420

420

390

380

380

400

390

420

410

430

440

410

440

390

410

440

420

430

ilnum Nickel' Oenum, HI*»«hi«H dissolved (JX)

<30 850

<30 810

<30 790

<30 770

<30 810

<30 770

<30 850

<1 760

<1 790

<1 700

<1 780

<! 740

<1 700

<1 810

<1 820

<1 820

<! 820

<1 840

<! 810

<1 770

1 730

<1 740

<1 850

<! 770

1 730

CA!A- 5f.lr Silver, 

disfted dif~{f

<1 <3

<5 <3

<1 <3

<1 <3

<1 4

<1 <3

<1 <3

<1 5

<1 <3

<1 5

<1 <3

<2 <3

<3

<2

<2

<3

<3

<3

<2

<2

<3

<3

<3

<3

<3

Strontium, 

dissolved

1,600

1,600

1,600

1,600

1,600

1,500

1,700

1,500

1,600

1,400

1,400

1,500

1,400

1,400

1,400

1,500

1,600

1,600

1,600

1,500

1,500

1,500

1,600

1,600

1,600

Vanadium, 

dissolved 

(ug/L)

<60

<60

<60

<60

<60

<60

<60

25

22

20

19

<18

22

23

23

<18

22

<18

23

22

24

24

<18

<18

<18

Zinc, 

dissolved 

(ug/L)

3,800

3,500

3,500

3,600

3,600

3,500

3,600

3,400

3,400

3,100

3,300

3,200

3,300

3,300

3,500

3,600

3,600

3,700

3,500

3,500

3,100

3,300

3,700

3,400

3,300

26 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water In the Sand Coulee Coal 

Area, Montana
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued)

SITE 6, 471851111111101--GIFFEN SPRING NEAR STOCKETT, MT

Date

Jul 1994

21...

Aug

17...

Sep

06...

Oct

13...

Nov

14...

Dec

15...

Jan 1995

11...

Feb

21...

Mar

16...

Apr

11...

May

16...

Jun

12...

Jul

12...

Aug

15...

Sep

12...

Oct

11...

Nov

28...

Jan 1996

10...

Feb

20...

Apr

02...

May

06...

Jun

04...

Jul

01...

Aug

06...

Sep

03...

Tim*

0845

0800

1445

1600

1400

1120

1020

1525

1250

1445

1820

1835

1745

1110

0845

1040

0915

1340

1310

1330

1110

1520

1700

1145

1015

Streamflow, Instantaneous 

(ffts)

0.46

.49

.54

.53

.50

.48

.49

.43

.42

.40

.38

.40

.54

.55

.50

.53

.54

.55

.43

.50

.41

.55

.50

.53

.51

Specific conductance, 

onstte 

OiS/cm)

1,250

UIO

1,190

1,130

1,140

1,100

1,100

1,090

1,070

1,060

1,130

982

1,200

1,260

1,400

1380

1320

1,270

1,220

1,170

1,120

1,070

1,120

1,040

1,040

Temperature, 

air <°C)

20.5

15.0

29.5

14.0

6.0

4.0

7.0

18.0

9.0

10.5

15.0

24.0

18.0

18.0

15.0

12.0

-1.0

6.0

9.0

9.0

10.0

21.0

29.5

19.0

16.0

Temperature, 

water <°C)

9.0

9.0

10.0

9.0

9.5

10.0

10.0

9.0

11.0

9.0

9.0

8.5

9.0

9.0

9.0

9.0

9.0

9.0

9.0

9.0

9.0

9.0

9.0

9.0

9.0

PH, 

onslte (standard 

units)

4.6

4.8

4.5

5.1

5.0

5.2

5.4

5.6

5.6

5.6

5.8

5.8

4.6

4.2

3.7

4.0

4.5

4.6

4.7

4.6

5.0

5.1

4.8

5.3

5.5

Hardness, 

total 

(mg/Las 

CsC03)

450

470

440

450

470

460

470

470

440

470

470

440

450

440

480

460

450

480

470

470

450

450

480

440

450

Calcium, dissolved 

(mg/L)

110

120

110

110

120

120

120

120

110

120

120

110

110

110

120

110

110

120

120

120

110

110

120

110

110

Magnesium, dissolved 

(mg/L)

42

42

41

42

42

39

42

42

40

41

42

39

42

40

43

44

43

44

42

42

42

42

44

41

43

Sodium, dissolved 

(mg/L)

14

14

14

15

15

14

15

16

15

15

17

15

13

11

12

12

12

13

13

15

15

15

14

14

15

Sodium adsorption 

ratio

0.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.2

.2

.2

.2

.3

.3

.3

.3

.3

.3

.3

.3

TABLE 3 27
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 6, 471851111111101-GIFFEN SPRING NEAR STOCKETT, Mi-Continued

Date

Jul 1994

21...

Aug

17...

Sep

06...

Oct

13...

Nov

14...

Dec

15...

Jan 1995

11...

Feb

21...

Mar

16...

Apr

11...

May

16...

Jun

12...

Jul

12...

Aug

15...

Sep

12...

Oct

11...

Nov

28...

Jan 1996

10...

Feb

20...

Apr

02...

May

06...

Jun

04...

Jul

01...

Aug

06...

Sep

03...

Potassium, 

dissolved 

(mg/L)

5.4

6.3

5.7

6.0

5.7

5.6

5.4

5.6

5.6

5.6

5.9

5.3

4.7

4.8

4.5

4.6

4.4

5.0

5.4

4.9

5.5

5.1

5.5

5.9

5.3

Acidity

4.5

5.2

4.8

3.9

4.6

3.1

4.9

1.9

1.5

1.3

.6

1.6

5.3

5.8

8.3

9.5

8.1

7.3

5.4

4.8

3.5

3.8

3.8

2.1

1.5

Alkalinity, Su|fate

fmn/l a. dissolved

(S&? ««*>

e<l 740

e<l 750

e<l 790

e<l 700

e<l 700

e<l 610

e<l 610

e<l 740

e<l 540

e<l 530

e<l 630

e<l 480

e<l 760

e<l 1,000

e<l 900

e<l 920

e<l 930

e<l 900

e<l 820

e<l 790

e<l 750

e<l 670

e<l 780

e<l 630

e<l 550

Chloride, 

dissolved 

(mg/L)

3.1

3.3

3.4

3.1

3.3

3.2

3.2

4.4

3.4

3.7

4.5

4.7

4.7

4.7

2.9

3.0

2.7

5.0

3.1

4.7

4.7

4.3

4.0

6.1

4.0

Fluoride, 

dissolved 

(mg/L)

0.4

.2

1.0

1.0

-

.6

.6

.6

.5

.9

1.0

.2

.8

.4

1.3

1.2

1.4

1.5

1.4

1.3

1.2

1.1

1.0

.9

.8

Silica, 

dissolved

21

20

20

19

18

18

17

18

17

18

16

17

23

21

24

23

23

25

22

22

19

18

21

17

18

Solids, 

sum of constituents, 

dissolved 

(mg/L)

el,040

el, 060

el, 080

e982

e985

e883

e883

el, 020

e790

e797

e895

e715

el, 070

el, 300

el, 260

el ,260

el ,260

el, 240

el, 130

el, 090

el, 020

e932

el,070

e883

e805

Solids, 

dissolved 

(ton/ 

acre-ft)

el. 41

el. 44

el. 47

el. 33

el.34

el. 20

el .20

el.38

el. 07

el. 08

el. 22

e.97

el .45

el. 77

el.71

el.71

el.71

el. 69

el.54

el. 48

el.38

el. 27

el. 46

el. 20

el. 09

Solids, 

dissolved 

(ton/d)

el. 29

el. 40

el.58

el. 40

el.33

el. 14

el. 17

el. 18

e.90

e.86

e.92

e.77

el. 56

el. 93

el. 70

el. 80

el. 84

el. 84

el.31

el. 47

el. 13

el.38

el. 44

el. 26

el. 11

28 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 6, 471851111111101--GIFFEN SPRING NEAR STOCKETT, MT--Continued

Date

Jul 1994

21...

Aug

17...

Sep

06...

Oct

13...

Nov

14...

Dec

15...

Jan 1995

11...

Feb

21...

Mar

16...

Apr

11...

May

16...

Jun

12...

Jul

12...

Aug

15...

Sep

12...

Oct

11...

Nov

28...

Jan 1996

10...

Feb

20...

Apr

02...

May

06...

Jun

04...

Jul

01...

Aug

06...

Sep

03...

Aluminum, 

dissolved

15,000

14,000

12,000

8,200

6,500

4,600

3,400

2,500

2,000

1,900

1,100

1,500

19,000

23,000

33,000

35,000

30,000

30,000

19,000

13,000

6,100

3,600

6,900

1,900

2,000

Arsenic, Barium, 

dissolved dissolved

<1 24

<1 25

<1 24

1 24

1 24

<1 23

1 25

<1 24

<1 23

<1 25

<1 24

<1 27

<1 35

<1 40

<2 37

<1 39

<1 36

<2 35

<1 32

1 30

<1 27

<1 29

<1 26

<1 26

<1 25

Beryllium, 

dissolved

6

6

6

4

4

4

3

2

2

2

2

2

7

9

11

10

9

8

7

6

5

4

5

3

3

Boron, 

dissolved

90

90

110

-

no

100

90

70

80

80

80

70

90

90

120

120

110

80

80

90

80

70

60

60

50

Cadmium, 

dissolved

8

18

18

6

9

9

12

2

3

2

<1

2

6

8

10

8

10

10

11

10

5

4

4

3

3

Chromium, 

dissolved 

(H9/L.)

<5

6

<5

<5

<5

<5

<5

<5

<5

<5

5

<5

<5

<5

<10

<5

7

7

<5

<5

5

<5

<5

<5

<5

Cobalt, 

dissolved fog/D

380

480

260

260

250

510

240

280

150

140

110

120

200

240

300

310

350

290

260

280

200

160

200

150

130

Copper, 

dissolved

20

20

10

<10

<10

<10

<10

<10

<IO

<10

<10

<10

40

60

80

60

40

30

10

<10

<10

<10

<10

<10

<10

Iron, 

dissolved

81,000

83,000

80,000

73,000

71,000

64,000

63,000

63,000

54,000

58,000

55,000

40,000

86,000

81,000

110,000

100,000

99,000

93,000

81,000

73,000

61,000

60,000

70,000

53,000

54,000

TABLE 3 29
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 6, 471851111111101--GIFFEN SPRING NEAR STOCKETT, MT--Continued

Date

Jul 1994

21...

Aug

17...

Sep

06...

Oct

13...

Nov

14...

Dec

15...

Jan 1995

11...

Feb

21...

Mar

16...

Apr

11...

May

16...

Jun

12...

Jul

12...

Aug

15...

Sep

12...

Oct

11...

Nov

28...

Jan 1996

10...

Feb

20...

Apr

02...

May

06...

Jun

04...

Jul

01...

Aug

06...

Sep

03...

Lead, Lithium, 

dissolved dissolved 

(ug/L) (ug/L)

<10 68

<10 79

<10 76

<10 86

<10 69

<10 69

<10 74

<1 73

<1 70

<1 69

<1 68

<1 60

<1 73

<1 69

<1 77

<1 80

<1 81

<1 80

<1 81

<1 78

<1 73

<1 71

<1 70

<1 71

<1 67

Manganese, 

dissolved (ngfl-)

370

390

380

350

370

340

350

350

330

350

490

320

370

430

510

480

440

430

390

390

370

350

380

340

340

Molyb- N|cke| Seledenum, <4!--~i,,.l.i nium, 

dissolved diff5{'fd dissolved 

(ug/L) U'W (ug/L)

<10 390 <1

<10 400 <5

<10 390 <1

<10 340 <1

<10 330 <1

<10 310 <1

<10 310 <1

<1 270 <1

<1 250 <1

<1 260 <1

2 270 <1

<1 230 <1

<1 400

<1 450

<1 570

<1 540

1 550

<1 540

<1 450

<1 400

<1 350

<1 340

<1 340

<1 270

<1 270

Silver StronOIIVVI, tiiam

^SEJF' disToTved (ng/U (ug/L)

2 350

<1 370

<1 370

<1 360

<1 350

<1 330

<1 370

<1 370

<1 350

<1 360

<1 320

<1 310

<1 340

<1 320

<2 340

<1 350

<1 370

<1 380

<1 370

<1 360

<1 350

<1 350

<1 380

<1 330

<1 340

Vanadium, 

dissolved

<20

<20

<20

<20

<20

<20

<20

<6

<6

<6

<6

<6

<6

<6

<12

8

<6

<6

<6

7

<6

<6

<6

<6

<6

Zinc, 

dissolved 

(Rg/L)

1,600

1,600

1,600

1,300

1,300

1,200

1,200

1,000

920

1,000

870

830

1,700

1,800

2,500

2,300

2,300

2,200

1,900

1,600

1,400

1,300

1,500

1,100

1,100

30 Water-Quality Data (July 1004 through September 1006) and Statistical Summaries of Data for Surface Water In the Sand Coulee Coal 

Area, Montana
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued)

SITE 7, 472016111085701--COTTONWOOD MINE NO. 6 DRAIN TO COTTONWOOD CREEK NEAR STOCKETT, MT

Date

Feb 1995

21...

Mar

16...

Apr

11...

May

17...

Jun

12...

Jul

12...

Aug

15...

Sep

12...

Oct

11...

Nov

28...

Jan 1996

10...

Feb

20...

Apr

02...

May

06...

Jun

03...

Jul

01...

Aug

06...

Sep

03

Time

1720

1215

1400

1345

1750

1610

1150

1100

1130

1000

1450

1400

1410

1145

1710

1510

1220

1110

Streamflow, instantaneous 

(f&s)

0.02

.02

.02

.05

.15

.12

.09

.06

.05

.04

.03

.02

.02

.02

.03

.02

.02

.02

Specific conductance, 

onsite 

(nS/cm)

6,020

5,940

5,960

5,620

5,610

5,580

5,730

5,770

5,790

5,880

5,870

5,980

5,890

5,820

5,790

5,570

5,680

5,680

Temperature, 

air <°C)

10.5

11.0

8.0

21.0

26.0

20.0

21.0

19.0

16.0

-1.0

7.0

9.0

10.0

15.0

25.0

31.0

21.0

18.0

Temperature, 

water <°C)

9.0

9.5

9.5

11.5

10.0

10.0

11.0

10.5

10.0

6.0

8.0

8.0

8.0

9.0

10.0

11.0

11.0

10.5

PH, 

onsite (standard 

units)

2.6

2.6

2.6

2.5

2.7

2.8

2.7

2.6

2.6

2.6

2.6

2.6

2.6

2.7

2.7

2.7

2.5

2.7

Hardness, 

total 

(mg/L as 

CaC03)

1,300

1,400

1,300

1,400

1,400

1,500

1,500

1,500

1,400

1,400

1,500

1,500

1,400

1,400

1,500

1,400

1,400

1,400

Calcium, dissolved 

(mg/L)

330

350

340

340

350

360

350

370

340

340

380

350

360

350

350

340

330

340

Magnesium, dissolved 

(mg/L)

120

130

120

130

130

140

140

140

140

140

140

140

130

130

140

130

130

130

Sodium, dissolved 

(mg/L)

13

14

13

13

15

15

14

14

14

14

13

14

14

13

14

13

14

13

Sodium adsorption ratio

0.2

.2

.2

.2

.2

.2

.2

.2

.2

.2

.1

.2

.2

.2

.2

.2

.2

.2

TABLE 3 31
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 7, 47201 61 11 085701 --COTTONWOOD MINE NO. 6 DRAIN TO COTTONWOOD CREEK NEAR STOCKETT, MT-Continued

Date

Feb 1995

21...

Mar

16...

Apr

11...

May

17...

Jun

12...

Jul

12...

Aug

15...

Sep

12...

Oct

11...

Nov

28...

Jan 1996

10...

Feb

20...

Apr

02...

May

06...

Jun

03...

Jul

01...

Aug

06...

Sep

Potassium, 

dissolved 

(mg/L)

2.1

2.1

2.3

1.7

3.9

5.7

3.7

.5

2.1

2.1

2.4

2.6

2.7

.6

3.0

3.6

4.0

3.6

Acidity 

(mg/L as H+)

81

77

81

77

74

75

83

84

83

83

87

86

84

85

85

82

86

85

Alkalinity, Suifate, 

/mnfl i « dissolved (SSx>3)° <« **

e<l 7,200

e<l 5,900

e<l 6,800

e<l 5,500

e<l 5,600

e<l 5,800

e<l 6,600

e<l 5,600

e<l 5,800

e<l 5,600

e<l 6,200

e<l 5,900

e<l 6,000

e<l 6,500

e<l 7,200

e<l 5,800

e<l 5,400

e<l 5,400

Chloride, 

dissolved 

(mg/L)

14

15

20

1.3

3.8

3.3

18

1.5

1.3

12

<1

<1

4.8

2.0

3.8

13

2.3

3.4

Fluoride, 

dissolved 

(mg/L)

3.7

2.8

4.0

5.6

<1

<1

-

1.6

1.5

~

1.3

2.9

2.8

<1

<1

4.1

3.9

Silica, 

dissolved 

(mg/L as 

SlOz)

93

100

96

97

83

83

87

87

86

86

99

97

99

98

98

97

94

92

Solids,

sum of constituents, 

dissolved

(mg/L)

e8,950

e7,750

68,580

66,530

e6,600

e7,650

68,490

e7,560

e7,640

e7,470

68,170

67,830

67,920

68,350

e9,140

e7,640

e7,210

67,180

Solids, 

dissolved 

(ton/ 

acre-ft)

e!2.2

el 0.5

ell.7

e8.89

e8.98

elO.4

ell.5

elO.3

elO.4

elO.2

11.1

11.7

elO.8

ell.4

e!2.4

elO.4

e9.80

e9.76

Solids, 

dissolved 

(ton/d)

eO.60

e.50

e.53

e.92

e2.67

e2.48

62.15

61.22

el. 03

e.73

e.66

e.53

e.43

e.56

e.69

e.52

e.49

e.39

32 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 7, 472016111085701--COTTONWOOD MINE NO. 6 DRAIN TO COTTONWOOD CREEK NEAR STOCKETT, MT~Continued

Date

Feb 1995

21...

Mar

16...

Apr

11...

May

17...

Jun

12...

Jul

12...

Aug

15...

Sep

12...

Oct

11...

Nov

28...

Jan 1996

10...

Feb

20...

Apr

02...

May

06...

Jun

03...

Jul

01...

Aug

06...

Sep

03...

Aluminum, 

dissolved 

(H9/L)

410,000

410,000

410,000

380,000

350,000

350,000

390,000

430,000

380,000

410,000

450,000

440,000

420,000

400,000

420,000

390,000

390,000

380,000

Arsenic, 

dissolved 

(H9/L)

<10

<5

<10

<1

<1

<5

<5

<25

<5

<1

<2

<5

<1

<5

<10

<5

<5

<5

Barium, 

dissolved 

(H9/L)

--

--

-

100

--

-

-

-

110

110

130

120

120

120

120

120

110

120

Beryllium, 

dissolved 

(H9/L)

120

120

120

94

110

100

110

120

110

110

120

120

120

130

130

110

120

120

Boron, 

dissolved 

(H9/L)

480

500

520

470

490

480

570

500

520

520

530

490

520

540

-

-

510

Cadmium, 

dissolved (ng/L)

82

79

79

73

110

80

100

100

81

82

72

79

75

98

84

83

78

77

Chromium, 

dissolved 

(H9/L)

40

40

40

<50

50

<50

60

<50

<50

60

60

60

<50

<50

<80

80

<50

<50

Cobalt, 

dissolved 

(H9/L)

6,000

6,000

6,000

5,700

3,900

5,100

6,600

6,900

6,000

6,300

-

9,700

6,500

6,600

6,200

6,300

5,800

6,200

Copper, 

dissolved 

(H9/L)

80

80

80

<100

210

140

180

170

130

110

<100

140

100

<100

110

110

<100

<100

Iron, 

dissolved 

(ug/L)

690,000

750,000

700,000

660,000

740,000

830,000

810,000

840,000

800,000

790,000

810,000

810,000

810,000

780,000

840,000

770,000

770,000

740,000

TABLE 3 33
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 7, 472016111085701-COTTONWOOD MINE NO. 6 DRAIN TO COTTONWOOD CREEK NEAR STOCKETT, MT-Continued

Date

Feb 1995

21...

Mar

16...

Apr

11...

May

17...

Jun

12...

Jul

12...

Aug

15...

Sep

12...

Oct

11...

Nov

28...

Jan 1996

10...

Feb

20...

Apr

02...

May

06...

Jun

03...

Jul

01...

Aug

06...

Sep

03...

Lead, Lithium, 

dissolved dissolved

<1 660

<1 690

<1 730

<1 670

<1 570

<1 550

<1 620

<1 580

<1 630

<1 660

<1 670

<1 710

<1 700

<1 680

<1 700

<1 550

<1 710

<4 650

Manganese, 

dissolved (ng/L)

2,100

2,300

2,200

2,200

2,300

2,500

2,400

2,500

2,400

2,400

2,500

2,300

2,500

2,400

2,400

2,300

2,300

2,300

Molybdenum, 

dissolved 

(WI/D

2

<2

<2

2

5

3

<1

2

1

<1

2

2

<1

2

<1

1

<2

2

Nickel, *&% Silver,

""HS?11 dissolved *!5j?d 

< /L> (ng/L) (W"1-)

10,000 <2 <3

11,000 1 <3

10,000 <2 <3

10,000 <1 <10

10,000 4 <10

9,700 ~ <10

11,000 - <10

11,000 - <10

10,000 - <10

11,000 - <10

12,000 ~ <10

11,000 - <10

12,000 - <10

12,000 - <10

11,000 - <10

11,000 - <10

11,000 - <10

11,000 - 11

Strontium, 

dissolved 

(ng/L)

1,100

1,200

1,100

1,200

1,300

1,500

1,300

1,300

1,300

1,300

1,300

1,300

1,200

1,200

1,200

1,200

1,200

1,200

Vanadium, 

dissolved 

(WJ/L)

110

110

240

140

140

120

150

140

180

98

130

150

140

170

150

150

<60

<60

Zinc, 

dissolved 

(H9/L)

51,000

51,000

51,000

45,000

46,000

44,000

49,000

53,000

48,000

48,000

56,000

52,000

54,000

53,000

55,000

53,000

50,000

50,000

34 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 8, 472114111095001--COTTONWOOD MINE NO. 2 DRAIN TO LADD COULEE AT STOCKETT, MT

Date

Jul 1994

21...

Aug

17...

Sep

06...

Oct

13...

Nov

14...

Dec

15...

Jan 1995

11...

Feb

21...

Mar

16...

Apr

11...

May

17...

Jun

12...

Jul

12...

Aug

15...

Sep

12...

Oct

11...

Nov

28...

Jan 1996

10...

Feb

20...

Apr

02...

May

06...

Jun

03...

Jul

01...

Aug

06...

Sep

03...

Time

0720

0720

1420

1525

1450

1100

1105

1710

1230

1430

1315

1815

1630

1130

1040

1100

0930

1420

1330

1345

1130

1750

1540

1200

1045

Streamflow, instantaneous 

(ffts)

0.01

.01

.005

.009

.02

.01

.007

.006

.05

.02

.07

.10

.06

.04

.03

.03

.001

.02

.04

.008

.006

.003

.005

.007

Specific conductance, 

onsite 

(uS/cm)

9,610

9,780

9,860

9,120

9,430

10,100

8,650

7,770

8,680

6,470

7,270

8,390

8,170

8,530

8,530

8,800

8,750

8,620

8,490

7,040

9,200

9,820

10,400

10,800

10,600

Temperature, 

air

12.5

13.0

29.5

14.0

6.0

3.5

8.0

12.0

9.0

10.5

21.0

26.0

21.0

21.0

18.0

13.0

-1.0

7.0

10.0

10.0

12.0

25.0

31.0

21.0

17.0

Temperature, 

water

11.0

12.0

19.0

11.0

0.0

0.0

1.0

3.0

4.5

10.5

22.0

25.5

25.5

20.5

15.0

11.5

.5

0.0

2.5

7.5

11.0

17.0

26.0

20.0

15.0

PH, 

onsite (standard 

units)

2.7

2.6

2.4

2.5

2.6

2.6

2.8

2.6

2.5

2.6

2.3

2.4

2.4

2.4

2.4

2.4

2.5

2.6

2.5

2.5

2.5

2.5

2.2

2.2

2.5

Hardness, 

total 

(mg/L as 

CaC03)

2,700

2,600

2,900

2,400

2,400

2,700

2,200

2,100

2,300

1,700

2,300

2,000

1,800

1,800

2,000

2,000

1,900

2,000

2,000

1,600

2,400

2,700

3,000

3,000

3,100

Calcium, dissolved 

(mg/L)

470

480

450

430

400

450

360

390

410

370

460

460

390

390

430

390

370

370

370

320

430

490

520

510

520

Magnesium, dissolved 

(mg/L)

360

350

430

320

330

370

310

270

320

200

270

210

200

210

230

240

240

260

250

200

310

360

410

420

430

Sodium, dissolved 

(mg/L)

10

12

11

8.9

4.7

9.8

7.3

6.9

8.8

5.9

9.0

9.5

9.1

9.2

9.8

8.9

8.4

8.5

7.4

6.4

8.6

8.9

9.4

10

11

Sodium adsorption ratio

0.1

.1

.1

.1

<.l

.1

.1

.1

.1

.1

.1

.1

.1

.1

.1

.1

.1

.1

.1

.1

.1

.1

.1

.1

.1

TABLE 3 36
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 8, 472114111095001--COTTONWOOD MINE NO. 2 DRAIN TO LADD COULEE AT STOCKETT, MT--Continued

Date

Jul 1994

21...

Aug

17...

Sep

06...

Oct

13...

Nov

14...

Dec

15...

Jan 1995

11...

Feb

21...

Mar

16...

Apr

11...

May

17...

Jun

12...

Jul

12...

Aug

15...

Sep

12...

Oct

11...

Nov

28...

Jan 1996

10...

Feb

20...

Apr

02...

May

06...

Jun

03...

Jul

01...

Aug

06...

Sep

03...

Potassium, 

dissolved 

(mg/L)

5.7

5.0

4.4

4.8

2.7

1.2

1.9

.3

-

.8

1.7

2.2

1.9

1.6

1.7

1.9

1.8

2.1

.3

.7

1.2

.3

1.1

4.4

4.2

Acidity 

(mg/L as H+)

230

230

240

210

220

240

190

100

190

120

130

180

170

200

200

210

210

190

190

150

210

210

250

270

260

Alkalinity, Su|fate

(mg/Las *"35d 

C*fc03) ("^

e<l 14,000

e<l 13,000

e<l 15,000

e<l 13,000

e<l 14,000

e<l 16,000

e<l 11,000

e<l 11,000

e<l 15,000

e<l 8,600

e<l 9,700

e<l 15,000

e<l 12,000

e<l 14,000

e<l 12,000

e<l 13,000

e<l 14,000

e<l 11,000

e<l 10,000

e<l 10,000

e<l 15,000

e<l 15,000

e<l 16,000

e<l 16,000

e<l 15,000

Fluoride, 

dissolved 

(mg/L)

<i

<i

<i

<i

-

<i

8.5

3.2

6.6

3.4

3.7

2.1

<1

-

-

4.9

<1

-

-

5.0

1.1

2.0

<1

6.2

6.6

Silica, 

dissolved 

(mg/L as 

SlOj)

60

41

39

110

66

56

38

73

92

68

91

130

130

140

140

130

120

100

90

79

110

120

130

130

130

Solids, 

sum of constituents, 

dissolved 

(mgA)

618,000

el 7,000

el 8,900

el6,600

el 7,800

620,700

el 3,900

612,800

el 8,200

el 0,800

612,200

el 8,1 00

615,000

el 7,400

el 5,600

el 6,600

el 7,600

614,500

e!3,200

612,500

el 8,600

el 8,900

e20,000

620,600

el 9,600

Solids, 

dissolved 

(ton/ 

acre-ft)

e24.5

623.1

e25.8

622.6

e24.2

628.2

el 8.9

e!7.5

e24.8

e!4.7

e!6.6

e24.6

e20.4

e23.6

e21.2

622.5

e23.9

e!9.8

elS.O

e!7.0

e25.2

625.7

e27.2

628.0

e26.6

Solids, 

dissolved 

(ton/6)

eO.54

e.46

e.26

e.40

e.72

--

e.45

e.24

e.29

el. 45

e.63

e3.61

e3.97

e2.72

el. 60

el. 34

el.28

e.04

e.82

el.28

e.40

6.31

e.16

e.28

e.37

36 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued)

SITE 8, 4721 141 11 095001 --COTTONWOOD MINE NO. 2 DRAIN TO LADD COULEE AT STOCKETT, MT--Continued

Date

Jul 1994

21...

Aug

17...

Sep

06...

Oct

13...

Nov

14...

Dec

15...

Jan 1995

11...

Feb

21...

Mar

16...

Apr

11...

May

17...

Jun

12...

Jul

12...

Aug

15...

Sep

12...

Oct

11...

Nov

28...

Jan 1996

10...

Feb

20...

Apr

02...

May

06...

Jun

03...

Jul

01...

Aug

06...

Sep

03...

Aluminum, 

dissolved 

(H9/L)

1,300,000

1,400,000

1,300,000

1,200,000

1,300,000

1,600,000

910,000

980,000

1,300,000

740,000

830,000

990,000

980,000

1,100,000

1,200,000

1 ,200,000

1,200,000

1,200,000

1,100,000

830,000

1,300,000

1,220,000

1,370,000

1,520,000

1,460,000

Arsenic, Barium, 

dissolved dissolved

(H9/L) (n9/L)

<2 <200

<1 <200

<1 <200

<2 <200

<1 <200

<1 <200

<1 <200

<10 <200

<10 <200

<10 <200

<1 <200

8 <200

9 <200

<25 <200

<25 <200

11 140

5 130

<2 140

2 130

<2 110

<5 150

<10 170

<5 190

<10 200

<5 180

Beryllium, 

dissolved 

(H9/L)

110

140

130

190

170

160

140

160

200

130

150

170

150

170

180

180

160

170

160

140

200

220

250

270

300

Boron, 

dissolved 

(U9/L)

930

960

1,000

900

850

730

630

500

630

390

500

790

760

950

910

950

760

750

630

470

770

530

-

420

-

Cadmium, 

dissolved 

(H9/L)

290

300

310

-

240

320

240

190

230

160

200

290

310

350

370

320

310

510

360

510

310

290

310

320

310

Chromium, 

dissolved <ng/L)

130

120

170

<100

160

110

90

60

90

70

70

170

140

270

170

160

180

150

100

100

150

<200

<200

<200

<200

Cobalt, 

dissolved 

(H9/L)

9,100

9,000

9,300

8,400

6,600

9,500

7,800

6,600

8,200

4,900

5,400

8,400

6,200

7,300

7,400

7,400

7,600

7,000

-

6,700

8,700

8,600

11,000

11,000

11,000

Copper, 

dissolved 

(U9/L)

420

420

430

360

310

320

270

300

330

210

200

600

660

820

780

660

510

470

410

300

350

570

570

570

<400

Iron, 

dissolved 

(H9/L)

1,700,000

1,600,000

1,600,000

1,410,000

1,600,000

2,000,000

1,000,000

840,000

1,000,000

720,000

720,000

1,200,000

1,200,000

1,400,000

1,500,000

1,500,000

1,500,000

1,500,000

1,300,000

980,000

1,300,000

1,600,000

1,600,000

1,900,000

1,900,000

TABLE 3 37
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued)

SITE 8, 4721 141 11 095001 -COTTONWOOD MINE NO. 2 DRAIN TO LADD COULEE AT STOCKETT, MT-Continued

Date

Jul 1994

21...

Aug

17...

Sep

06...

Oct

13...

Nov

14...

Dec

15...

Jan 1995

11...

Feb

21...

Mar

16...

Apr

11...

May

17...

Jun

12...

Jul

12...

Aug

15...

Sep

12...

Oct

11...

Nov

28...

Jan 1996

10...

Feb

20...

Apr

02...

May

06...

Jun

03...

Jul

01...

Aug

06...

Sep

03...

Lead, Lithium, 

dissolved dissolved

(ug/L) (ug/L)

<1 1,700

<1 1,700

<1 1,900

1,800

<1 1,700

<1 2,000

<1 1,400

<1 1,300

<1 1,600

1 1,100

<1 1,200

<1 1,500

<1 1,200

<1 1,400

<1 1,400

<1 1,500

<1 1,500

<i uoo

<i uoo

<1 1,100

<1 1,500

<1 1,600

<1 1,800

<1 2,000

<4 2,000

Manganese, 

dissolved

(ug/L)

8,300

8,100

7,700

7,300

-

17,000

11,000

12,000

12,000

5,900

7,900

7,200

6,700

5,600

5,600

5,400

5,600

7,600

7,900

6,300

8,500

9,100

10,000

11,000

9,900

Molybdenum, 

dissolved

(ug/L)

<5

<1

<1

-

<1

1

<2

<2

2

<2

2

<2

1

6

2

4

<1

<1

3

<1

1

<2

<1

<2

3

Nickel, Selenium, 

dissolved dissolved

(ug/L) (ug/L)

<10

15,000 <10

4

13,000 <10

13,000 <10

15,000 <5

13,000 <2

10,000 <2

13,000 <2

8,500 <1

9,400 <1

11,000 <5

10,000

12,000

13,000

12,000

12,000

12,000

11,000

9,000

13,000

14,000

16,000

17,000

17,000

Silver Stron- 0ii wif ftiiim

di^SiV?d dissolved

WW (ugA)

<1 2,100

<1 2,100

<1 2,200

<20 2,000

<1 2,000

<1 2,200

<1 1,900

<10 1,600

<5 1,900

<4 1,500

<10 1,800

<20 1,400

<20 1,200

<20 1,300

<20 1,400

<10 1,500

<10 1,500

<15 1,600

<10 1,600

<10 1,300

<10 1,900

<30 2,000

<40 2,100

<30 2,500

<40 2,400

Vanadium, 

dissolved

(ug/L)

-

230

--

-

-

<6

<120

<6

<60

<120

<120

<120

<120

130

99

<90

<60

<60

89

<240

<240

<240

<240

Zinc, 

dissolved

'M*L'

70,000

70,000

77,000

62,000

67,000

78,000

62,000

51,000

67,000

42,000

44,000

52,000

48,000

53,000

62,000

59,000

58,000

59,000

57,000

47,000

65,000

75,000

83,000

87,000

86,000

38 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water In the Sand Coulee Coal 

Area, Montana
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 9, 472212111093301-NUMBER FIVE COULEE NEAR STOCKETT, MT

Date

Jul 1994

20...

Jan 1995

11...

Apr

11...

May

17...

Jun

13...

Jul

12...

Aug

15...

Sep

12...

Oct

11...

Nov

27...

Jan 1996

10...

Feb

20...

Apr

02...

May

06...

Stream- Specific Tamf>ar ramnar PH> Hardflow, conduc- am£f «*/,« onsite ness, 

Time instan- tance, "H*1 £"[* (stand- total 

taneous onsite /"ii* /fr-\ ard (mg/Las 

(fP/s) (uS/cm) ( **' ( ^> units) CaCO3)

1745

1155

1800

1405

1600

1510

1430

1315

1250

1145

1100

1120

1500

1330

0.02 1,010

.12 964

.40 845

9.5 645

5.2 660

7.1 698

1.5 899

.80 1,000

.81 1,080

.72 998

.52 1,160

.02 1,040

.20 924

.01 1,130

27.0 29.0 8.4 490

4.0 .5 6.8 500

5.0 11.0 7.6 390

21.0 17.0 8.2 300

25.0 22.5 8.4 310

20.0 16.5 8.2 340

25.0 19.0 7.8 430

24.0 18.0 6.9 470

20.0 13.0 6.5 530

-7.0 0.0 6.8 580

5.0 0.0 5.3 590

9.0 0.0 5.1 530

10.0 3.0 6.1 470

18.0 22.0 7.5 620

Calcium, "JJJIIJf" Sodium, _ji_ slum, -j! , dis- dj dissolved geiweH solved (_____/ \ soivea / »../ \ m9/L> (mg/L) <m9/L>

120 45 19

140 37 14

98 35 24

62 34 25

61 38 22

72 38 23

99 44 21

110 47 20

130 50 20

150 50 19

160 46 14

140 43 14

130 35 11

170 48 19

Sodium adsorption 

ratio

0.4

.3

.5

.6

.5

.5

.4

.4

.4

.3

.3

.3

.2

.3

Date

Jul 1994

20...

Jan 1995

11...

Apr

11...

May

17...

Jun

13...

Jul

12...

Aug

15...

Sep

12...

Oct

11...

Nov

27...

Jan 1996

10...

Feb

20...

Apr

02...

May

06...

Potassium, 

dissolved 

(mg/L)

5.7

6.2

5.4

4.6

4.1

4.1

4.7

5.4

5.8

5.4

6.9

5.4

4.8

6.9

Acidity Alkalinity,

(mg/L as /mf,n <>» u+\ (mg/L as

H ' CaC03)

<0. 1 49

.1 27

<.l 33

<.l 259

<.l 230

<.l 238

<.l 126

<.l 32

.4 13

.2 5.4

1.5 e<l

.5 2.0

.3 1.5

<.l 21

Sulfate, Chloride, Fluoride, ri 

dissolved dissolved dissolved , 

(mg/L) (mg/L) (mg/L) *

500 4.3 0.7

500 3.9 .4

380 4.4 .4

77 4.7 .6

100 4.2 .4

120 4.7 .6

330 4.4 .8

490 4.8 .5

550 5.0 .5

650 4.2 .4

750 5.7 .7

550 3.6 .6

470 3.1 .6

590 5.3 1.0

Solids,

Silica, sum of Solids, 

issolved const!- dissolved 

mg/L as tuents, (ton/ 

SiO2) dissolved acre-ft)

(mg/L)

1.4 726 0.99

7.7 727 .99

6.2 574 .78

7.4 371 .50

5.6 374 .51

8.2 414 .56

4.6 585 .80

4.3 704 .96

5.1 782 1.06

6.9 896 1.22

12 el,030 el.40

8.2 772 1.05

9.2 674 .92

6.6 861 1.17

Solids, 

dissolved 

(ton/d)

0.03

.24

.62

9.52

5.25

7.94

2.37

1.52

1.71

1.74

el. 44

.04

.36

.02

TABLE 3 39
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 9, 472212111093301--NUMBER FIVE COULEE NEAR STOCKETT, MT-Continued

Date

Jul 1994

20...

Jan 1995

11...

Apr

11...

May

17...

Jun

13...

Jul

12...

Aug

15...

Sep

12...

Oct

11...

Nov

27...

Jan 1996

10...

Feb

20...

Apr

02...

May

06...

tilnlir Arsenic, Barium, 

dissolved <H**°toe<* dissolved uissoiveu (uo/L) (uQ/L)

300 <1 68

40 <1 71

70 <1 120

80 <1 130

130 <1 160

310 <1 140

240 <1 100

50 <1 98

40 <1 79

60 <1 59

500 <2 43

1,700 <1 41

150 <1 32

30 <1 37

Beryllium, 

dissolved 

(MJ/L)

<0.5

<.5

<5

<5

<.5

<5

<5

<.5

<.5

<.5

<.5

.9

<.5

<.5

Boron, 

dissolved

80

60

60

50

40

50

80

80

80

100

80

70

60

80

Cad- Chromium, mium, 

dissolved dissolved 

(ng/L) (ng/L)

<1 <5

<1 <5

<1 <5

<1 <5

<1 <5

<1 <5

<1 <5

1 <5

1 <5

3 <5

9 <5

3 <5

3 <5

<1 7

Cobalt, 

dissolved 

(H9/L)

7

80

20

<3

<3

7

30

100

-

210

170

200

-

60

Copper, Iron, 

dissolved dissolved

<10 9

<10 7

<10 6

<10 43

<10 54

<10 8

<10 6

<10 1,200

<10 5,800

<10 4,100

<10 27,000

<10 1,200

<10 6,100

<10 <3

Date

Jul 1994

20...

Jan 1995

11...

Apr

11...

May

17...

Jun

13...

Jul

12...

Aug

15...

Sep

12...

Oct

11...

Nov

27...

Jan 1996

10...

Feb

20...

Apr

02...

May

06...

Lead, Lithium, "SUS*" 

dissolved dissolved ^IJJjLd

/iin/l \ t \\Ot\_\ **ia«wi»^w

10 62 33

<10 51 730

<1 49 270

<10 23 25

<10 24 9

<10 16 61

<10 41 220

<10 49 500

<10 58 660

<10 60 960

<10 63 1,500

<10 52 1,200

<10 56 1,000

10 66 340

Molybdenum, 

dissolved 

(H9/L)

<10

<10

<1

<10

<10

<10

<10

<10

<10

<10

<10

<10

<10

<10

Nickel, 

dissolved <ng/L)

10

130

40

20

<10

20

60

170

240

350

450

350

290

140

JSJT Silver, 

disced -Jjcjyd

<l 1

<l <l

<l <l

1 <l

<l <l

<l

1

<1

<l

<l

<l

1

<1

2

Strontium, 

dissolved (ng/L)

350

340

260

250

290

280

330

350

370

400

400

350

300

410

Vana- 7!ri/. ji.. , zinc, diSSed *-aj-

(ng/L) we"-'

<6 <3

<6 250

<6 20

<6 7

<6 4

<6 3

<6 13

<6 170

<6 380

<6 970

<6 1,900

<6 1,200

<6 1,200

<6 66

40 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 10, 472233110552601-FRENCH COULEE WETLANDS OUTFLOW AT BELT, MT

Date

Jul 1994

19...

Aug

17...

Sep

06...

Oct

14...

Nov

14...

Dec

15...

Jan 1995

12...

Feb

22...

Mar

16...

Apr

12...

May

17...

Jun

13...

Jul

13...

Aug

17...

Sep

14...

Oct

12...

Nov

29...

Jan 1996

12...

Feb

21...

Apr

04...

Time

1145

1630

1010

0940

1040

1505

0950

0800

0910

1710

0750

0910

0820

1250

0930

1100

0950

0800

1200

1100

Streamflow, instantaneous 

(ffts)

0.02

.01

.02

.03

.02

.03

.02

.02

.02

.03

.05

.06

.10

.07

.04

.05

.01

.003

<.001

.01

Specific conductance, 

onsite 

(US/cm)

5,780

6,090

6,180

5,610

5,450

5,570

5,140

4,140

4,730

4,580

4,220

3,570

2,880

3,270

3,610

3,580

4,210

4,690

4,040

4,680

Temperature, 

air (°C)

28.0

31.0

22.0

7.0

5.5

3.5

1.0

6.0

8.0

16.0

11.0

20.0

17.0

18.0

15.0

6.0

9.0

9.0

12.0

8.0

Temperature, 

water (°C)

17.0

20.0

10.0

5.5

1.0

.5

.5

1.0

6.0

8.5

11.5

15.5

16.0

18.5

12.5

8.5

2.5

0.0

0.0

4.0

PH, 

onsite (standard 

units)

2.8

2.8

2.8

3.0

3.2

3.6

3.9

3.5

3.5

3.0

2.5

2.7

2.7

2.7

2.8

2.7

2.7

2.8

2.8

2.6

Hardness, 

total 

(mg/Las 

CaC03)

2,000

2,000

2,000

1,700

1,600

1,700

1,500

1,200

1,500

1,300

1,300

1,100

810

880

1,000

990

1,000

1,100

860

1,300

Calcium, dissolved 

(mg/L)

490

470

450

410

390

410

370

300

350

320

330

270

200

210

250

240

250

250

200

310

Magnesium, dissolved 

(mg/L)

190

210

210

170

150

160

150

100

140

110

110

92

75

86

92

95

100

110

87

120

Sodium, dissolved 

(mg/L)

38

44

37

26

23

25

24

16

26

18

19

19

18

19

18

18

17

14

12

23

Sodium adsorption ratio

0.4

.6

.4

.3

.3

.3

.3

.2

.3

.2

.2

.3

.3

.3

.2

.2

.2

.2

.2

.3

TABLE 3 41
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 10, 472233110552601--FRENCH COULEE WETLANDS OUTFLOW AT BELT, MT--Continued

Date

Jul 1994

19...

Aug

17...

Sep

06...

Oct

14...

Nov

14...

Dec

15...

Jan 1995

12...

Feb

22...

Mar

16...

Apr

12...

May

17...

Jun

13...

Jul

13...

Aug

17...

Sep

14...

Oct

12...

Nov

29...

Jan 1996

12...

Feb

21...

Apr

04...

Potassium, 

dissolved 

(mg/L)

33

29

27

18

15

17

13

9.6

17

12

7.2

5.8

4.7

4.8

3.8

3.8

3.0

5.6

5.5

6.7

Acidity 

(mg/L as

71

89

90

84

79

89

84

58

66

59

53

37

23

31

38

43

64

79

65

69

Alkalinity, Su|fate 

/mn/i « dissolved 

(S&5 <m9"->

e<l 5,700

e<l 6,400

e<l 6,800

e<l 6,400

e<l 6,000

e<l 6,700

e<l 5,700

e<l 6,000

e<l 5,700

e<l 5,800

e<l 4,900

e<l 3,200

e<l 2,200

e<l 2,900

e<l 2,900

e<l 3,400

e<l 4,600

e<l 5,100

e<l 4,500

e<l 5,200

Chloride, Fluoride, 

dissolved dissolved 

(mg/L) (mg/L)

22 <1

24 <1

29 <1

19 <1

.6 1.6

14 <1

10 2.9

17 3.5

13 3.3

22 3.7

26 3.9

19 <1

24 <1

26

17 1.8

16 1.7

10 <1

13

7.8 1.8

13 4.5

Silica, 

dissolved 

(mg/L as 

8102)

110

55

88

130

110

120

110

82

91

89

100

87

65

71

86

87

98

94

78

97

Solids, 

sum of constituents, 

dissolved 

(mg/L)

e7,660

e8,490

e8,950

e8,250

e7,760

e8,040

e6,860

e7,370

e6,730

e7,180

e5,800

e4,130

e2,870

e3,650

e3,780

e4,300

e5,840

e6,810

e5,860

e6,780

Solids, 

dissolved 

(ton/ 

acre-ft)

el 0.4

ell.6

e!2.2

ell.2

elO.6

elO.9

e9.34

elO.O

e9.15

e9.77

e7.89

e5.62

e3.90

e4.97

e5.15

e5.84

e7.94

e9.26

e7.97

e9.23

Solids, 

dissolved 

(ton/d)

eO.33

e.23

e.56

e.62

e.52

e.56

e.44

e.42

e.40

e.62

e.77

e.65

e.74

e.66

e.45

e.57

6.17

e.05

6.01

e.18

42 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water In the Sand Coulee Coal 

Area, Montana
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 10, 472233110552601--FRENCH COULEE WETLANDS OUTFLOW AT BELT, MT-Continued

Date

Jul 1994

19...

Aug

17...

Sep

06...

Oct

14...

Nov

14...

Dec

15...

Jan 1995

12...

Feb

22...

Mar

16...

Apr

12...

May

17...

Jun

13...

Jul

13...

Aug

17...

Sep

14...

Oct

12...

Nov

29...

Jan 1996

12...

Feb

21...

Apr

04...

Aluminum, 

dissolved

410,000

460,000

530,000

560,000

540,000

570,000

470,000

340,000

380,000

370,000

300,000

190,000

100,000

160,000

240,000

250,000

370,000

440,000

350,000

390,000

Arsenic, Barium, 

dissolved dissolved

<1 19

<1 <100

<1 <100

<1 15

<1 14

<1 19

<1 21

<1 12

<1 14

<1 12

<1 14

<1 10

<1 8

<1 8

<2 4

<1 9

<1 11

<2 14

<1 13

<2 <10

Beryllium, 

dissolved

62

40

40

62

49

50

50

37

45

44

39

27

15

21

26

29

37

38

39

45

Boron, 

dissolved

440

510

490

370

310

410

310

200

270

250

230

210

150

180

170

190

210

290

210

260

Cadmium, 

dissolved

<10

<5

<5

<5

<5

<5

<5

3

3

3

4

2

2

3

3

5

9

9

6

3

Chromium, 

dissolved <ng/L)

<50

20

40

50

80

60

60

40

40

40

80

50

20

40

50

80

110

110

100

80

Cobalt, 

dissolved

-

410

420

-

-

-

-

260

300

280

280

160

90

150

180

190

240

360

250

350

Copper, 

dissolved

<100

<50

<50

<50

<100

<50

<50

<50

<100

50

70

<40

<30

30

30

70

140

<100

70

<100

Iron, 

dissolved

650,000

770,000

770,000

500,000

500,000

-

710,000

490,000

540,000

430,000

280,000

240,000

180,000

170,000

170,000

180,000

380,000

770,000

610,000

610,000

TABLE 3 43
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 10, 472233110552601-FRENCH COULEE WETLANDS OUTFLOW AT BELT, MT-Continued

Date

Jul 1994

19...

Aug

17...

Sep

06...

Oct

14...

Nov

14...

Dec

15...

Jan 1995

12...

Feb

22...

Mar

16...

Apr

12...

May

17...

Jun

13...

Jul

13...

Aug

17...

Sep

14...

Oct

12...

Nov

29...

Jan 1996

12...

Feb

21...

Apr

04...

Lead, Lithium, 

dissolved dissolved 

(ug/L) (ug/L)

<10 660

<10 740

<10 750

<10 630

<10 600

<10 590

<10 560

<1 420

<1 470

<1 460

2 430

2 350

<1 200

1 260

<1 280

1 310

3 440

4 450

6 410

<1 510

Manganese, 

dissolved 

(ug/L)

5,600

6,400

5,600

4,500

3,900

3,900

3,300

2,000

3,800

2,400

1,700

1,200

790

870

1,100

1,000

UOO

1,600

1,400

3,100

Molyb- Nickai Seledenum, .«;.«Wi!«Li nium, dissolved dtE3n - <««»olved 

(ug/L) U*8'*v (ug/L)

<10 750 <10

<10 760 <5

<10 720 <5

<IO 820 <1

<10 840 <1

<10 1,100 <2

<10 1,000 <1

<1 680 <1

<1 690 <1

<1 670 <1

<1 680 <1

<1 410 <5

<1 230

<1 270

<1 350

<1 410

<1 670

<1 890

<1 780

<1 700

Silver, 

dissolved

<10

<1

<1

<5

18

<5

<5

4

<3

<3

3

7

<3

<2

<2

<3

<5

<10

<5

<10

Strontium, 

dissolved 

(ug/L)

2,900

2,900

2,900

2,600

2,300

2,500

2,600

1,900

2,200

2,000

1,900

1,500

1,100

1,200

1,300

1,400

1,800

1,600

1,600

2,000

Vanadium, 

dissolved 

(ng/L.)

<100

-

-

<100

<100

<100

<100

<30

<100

<30

12

<24

<18

<12

<12

<18

<30

<60

40

<60

Zinc, 

dissolved 

(ng/L)

-

-

-

3,100

7,400

6,800

4,600

2,500

2,400

2,300

1,900

1,000

810

1,100

1300

1,900

3,700

5,100

3,100

2,300

44 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 11, 472235110553201--FRENCH COULEE WETLANDS INFLOW AT BELT, MT

Date

Jul 1994

19...

Aug

17...

Sep

06...

Oct

14...

Nov

14...

Dec

15...

Jan 1995

12...

Feb

22...

Mar

16...

Apr

12...

May

17...

Jun

13...

Jul

13...

Aug

17...

Sep

14...

Oct

12...

Nov

29...

Jan 1996

12...

Feb

21...

Time

1315

1600

1000

0930

1035

1500

0945

0755

0905

1700

0745

0905

0800

1230

1000

1030

1015

0830

1130

Streamflow, instantaneous 

<«%)

0.04

.04

.04

.04

.04

.04

.05

.04

.02

.03

.08

.12

.11

.09

.06

.05

.06

.04

.04

Specific conductance, 

ontite 

(^S/crn)

5,970

5,750

5,640

5,630

5,630

5,530

5,620

5,680

5,690

3,230

2,440

2,300

2,730

3,350

3,560

3,830

5,040

6,550

5,760

Temperature, 

air (°C)

28.0

31.0

22.0

7.0

5.5

3.5

1.0

6.0

8.0

16.0

14.0

27.0

17.0

26.0

17.0

6.0

8.5

8.0

12.0

Temperature, 

water <°C)

11.5

12.5

12.5

11.0

10.0

9.5

9.0

8.0

7.5

9.0

10.0

10.5

10.0

11.0

11.0

10.5

9.5

8.5

-

PH, 

onslte (standard 

units)

2.7

2.7

2.5

2.6

2.7

2.6

2.6

2.6

2.7

2.7

2.6

2.9

2.8

2.7

2.7

2.7

2.6

2.5

2.6

Hardness, 

total 

(mg/Las 

CaC03)

1,100

1,000

1,000

1,100

1,100

1,000

1,100

1,100

1,100

690

580

550

620

660

720

750

860

1,100

990

Calcium, dissolved 

<mg/L)

240

230

220

250

240

240

250

240

250

150

120

110

130

140

160

160

190

230

230

Magnesium, dissolved 

(mg/L)

110

110

110

120

110

100

110

110

110

77

67

66

71

76

78

84

94

120

100

Sodium, dissolved 

(mg/L)

13

13

12

12

12

11

12

11

12

17

17

17

17

15

15

14

13

12

12

Sodium adsorption 

ratio

0.2

.2

.2

.2

.2

.2

.2

.1

.2

.3

.3

.3

.3

.3

.2

.2

.2

.2

.2

TABLE 3 45
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 11, 472235110553201-FRENCH COULEE WETLANDS INFLOW AT BELT, MT--Continued

Date

Jul 1994

19...

Aug

17...

Sep

06...

Oct

14...

Nov

14...

Dec

15...

Jan 1995

12...

Feb

22...

Mar

16...

Apr

12...

May

17...

Jun

13...

Jul

13...

Aug

17...

Sep

14...

Oct

12...

Nov

29...

Jan 1996

12...

Feb

21...

Potassium, 

dissolved 

(mg/L)

5.6

5.6

5.6

5.1

5.2

5.9

5.4

5.8

5.8

3.8

3.5

3.6

3.4

3.3

3.1

2.8

3.0

5.7

5.2

Acidity 

(mg/L as

99

98

98

94

91

93

97

91

92

32

23

22

27

40

46

54

78

120

95

Alkalinity, Su|fate

f mn/l a* dissolved (3&5? (mg/L)

e<l 6,000

e<l 6,000

e<l 6,100

e<l 6,100

e<l 6,000

e<l 6,300

e<l 5,900

e<l 7,100

e<l 6,700

e<l 2,800

e<l 2,100

e<l 2,000

e<l 2,300

e<l 3,100

e<l 2,900

e<l 3,700

e<l 5,000

e<l 7,400

e<l 6,500

Chloride, 

dissolved 

(mg/L)

7.9

8.3

4.5

9.1

9.7

5.7

4.9

20

38

24

31

23

23

22

13

12

8.2

18

7.3

Fluoride, 

dissolved 

(mg/L)

<1

<1

<1

<1

-

<1

1.4

3.6

2.2

1.7

2.4

<1

<1

<1

1.6

1.6

1.1

~

1.1

Silica, 

dissolved 

(mg/L as 

STOa)

100

100

99

110

100

100

110

100

110

64

45

41

50

64

70

75

90

120

110

Solids, 

sum of constituenta, 

dissolved 

(mg/L)

e7,990

e7,840

e7,950

e8,100

e7,810

e7,260

e6,860

e8,980

e8,680

e3,620

e2,690

e2,530

e2,960

e3,980

e3,940

e4,830

e6,560

e9,860

e8,470

Solids, 

dissolved 

(ton/ 

acre-ft)

elO.9

elO.7

elO.8

el 1.0

el 0.6

e9.87

e9.33

e!2.2

ell.8

e4.93

e3.66

e3.45

e4.02

e5.41

e5.35

e6.56

e8.92

e!3.4

ell.5

Solids, 

dissolved 

(ton/d)

e0.91

e.74

e.84

e.85

e.89

e.76

e.93

e.90

e.59

e.29

e.54

e.82

e.88

e.97

e.64

e.65

el. 06

el. 06

e.91

46 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water In the Sand Coulee Coal 

Area, Montana
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 11, 472235110553201--FRENCH COULEE WETLANDS INFLOW AT BELT, MT-Continued

Date

Jul 1994

19...

Aug

17...

Sep

06...

Oct

14...

Nov

14...

Dec

15...

Jan 1995

12...

Feb

22...

Mar

16...

Apr

12...

May

17...

Jun

13...

Jul

13...

Aug

17...

Sep

14...

Oct

12...

Nov

29...

Jan 1996

12...

Feb

21...

Aluminum, 

dissolved 

(WJ/L)

500,000

460,000

490,000

480,000

420,000

480,000

450,000

470,000

480,000

180,000

110,000

100,000

140,000

190,000

230,000

250,000

390,000

640,000

490,000

Arsenic, 

dissolved

fcg/D

23

16

18

32

17

18

39

32

39

8

5

4

3

11

16

14

2

37

32

Barium, 

dissolved 

(H9/L)

<10

<3

<3

<10

<10

<5

<10

<4

4

<3

9

9

7

<4

7

<10

11

17

14

Beryllium, 

dissolved 

(H9/L)

58

52

50

49

50

49

55

52

52

20

14

12

16

23

26

31

34

64

51

Boron, 

dissolved <ng/L)

420

430

430

430

440

470

370

350

380

170

110

90

130

210

200

260

330

470

360

Cadmium, 

dissolved 

(H9/L)

<10

-

-

<10

-

<5

-

11

11

<1

4

4

5

6

7

6

8

10

11

Chromium, 

dissolved 

(H9/L)

210

180

160

170

210

170

190

170

180

60

40

30

50

80

90

100

140

200

160

Cobalt, 

dissolved 

(H9/L)

-

-

-

-

-

--

-

420

440

150

110

100

120

180

210

240

300

420

350

Copper, 

dissolved (WJ/L)

<100

60

60

<100

<100

60

<100

<100

40

40

<30

<30

<30

40

<50

<100

<100

<150

<100

Iron, 

dissolved 

(H9/L)

1,000,000

900,000

900,000

1,000,000

900,000

--

920,000

910,000

960,000

300,000

190,000

170,000

220,000

360,000

460,000

520,000

760,000

1,300,000

1,000,000

TABLE 3 47
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 11, 472235110553201-FRENCH COULEE WETLANDS INFLOW AT BELT, MT--Continued

Lead, 

Date dissolved 

(H9/L)

Jul 1994 t

19... <10

Aug 

17... <10

Sep 

06... <10

Oct

14... <10

Nov

14... <10

Dec

15... <10

Jan 1995

12... <10

Feb

22... ' <1

Mar

16... 2

Apr 

12... <1

May 

17... 1

Jun

13... <1

Jul

13... <1

Aug 

17... 2

Sep 

14... 2

Oct

12... 2

Nov

29... 2

Jan 1996

12... 2

Feb

21... 3

Lithium, 

dissolved 

(H9/L)

560

590

560

650

570

540

590

580

580

260

180

170

200

260

270

340

460

670

600

Manganese, 

dissolved

910

870

830

890

880

830

880

860

900

340

210

200

280

370

430

470

670

1,100

870

Molyb- Nickel Sele"

denum, Hie««jw«H nium, 

dissolved diff°/Lfd dissolved 

(|ig/L) ms71-/ (ug/L)

<10 1,100 <10

<10 1,000 <5

<10 1,000 <5

<10 980 <2

<10 1,100 <10

<10 1,000 <2

<10 1,100 <1

<1 1,000 <1

<2 950 <1

<1 370 <2

<1 260 2

<1 230 2

<1 320

<1 450

<1 530

<1 540

<1 760

<1 1,300

<1 1,000

Silver, 

dissolved (ng/L)

<10

<3

<3

<10

<10

<5

<10

<4

<4

<3

<3

<3

<3

<4

7

<10

<10

<15

<10

Strontium, 

dissolved

2,200

2,300

2,200

2,300

2,200

2,100

2,400

2,300

2,400

1,200

930

890

1,000

1,200

1,200

1,400

1,800

2,300

2,200

Vanadium, 

dissolved

250

290

250

220

220

220

270

68

60

20

<18

<18

<18

32

48

130

68

120

93

Zinc, 

dissolved (ng/L)

5,100

4,800

4,600

5,000

4,800

4,600

5,000

4,800

4,800

1,800

1,300

1,200

1,600

2,000

2,400

2,700

3,700

5,800

4,800

48 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 12, 472235110553202--FRENCH COULEE WETLANDS INFLOW NO. 2 AT BELT, MT

Date

Apr 1996

04...

May

07...

Jun

05...

Jul

03...

Aug

08...

Sep

04...

Stream- Specific T««.rM»r TomnAr pH, Hard- /»_«,.!,..., Magne- G*M..~* flow, conduc- Temper- Temper- onsite ness, Calcium, 8ium, Sodium, 

Time instan- tance, at",!?' ^JJJ?' (stand- total' J^d dls-> sniwd 

taneous onsite ,opx /°r\ a«l (mg/L as 5~«\ solved 7~!,in\ 

(f?/s) (uS/cm) < c> < c> units) CaCO3) <m9/L> (mg/L) <m>/L>

1130

1630

1250

0900

1100

1040

0.04

.03

.03

.03

.03

.03

5,050

3,640

3,660

4,160

4,540

5,550

9.0 8.5 2.6 860 190

17.0 10.5 2.8 690 150

18.0 11.0 2.8 660 140

22.0 12.0 27 860 190

22.0 13.0 2.8 890 200

12.0 12.0 2.8 1,000 230

94

76

75

92

94

110

13

13

13

12

12

12

Sodium adsorption ratio

0.2

.2

.2

.2

.2

.2

Date

Apr 1996

04...

May

07...

Jun

05...

Jul

03...

Aug

08...

Sep

04...

Potassium, 

dissolved 

(mg/L)

5.3

.8

3.9

4.2

5.6

5.8

Acidity 

(mg/L as H*)

79

48

45

64

79

98

Alkalinity, 

lab 

(mg/L as 

CaC03)

e<l

e<l

e<l

e<l

e<l

e<l

Suifate, Chloride, Fluoride, dissolved 

dissolved dissolved dissolved flll/i 

(mg/L) (mg/L) (mg/L) slol)

5,300 9.6 3.9 100

3,300 13 2.2 79

3,800 13 1.6 70

4,300 9.1 <1 84

4,600 10 3.5 95

6,000 11 3.7 100

Solids,

sum of constituents, 

dissolved

(mg/L)

e7,030

e4,310

e4,790

e6,230

e6,150

e7,960

Solids, 

dissolved 

(ton/ 

acre-ft)

e9.55

e5.86

e6.51

e8.47

e8.36

elO.8

Solids, 

dissolved 

(ton/d)

eO.76

e.35

e.41

e.54

e.50

e.60

Date

Apr 1996

04...

May

07...

Jun

05...

Jul

03...

Aug

08...

Sep

04...

Aluminum, 

dissolved 

(ng/L)

430,000

230,000

210,000

310,000

360,000

480,000

Arsenic, 

dissolved

<2

5

5

14

22

8

Barium, 

dissolved

(H9/L)

13

8

11

11

13

19

®ery'" Bnrnn ^a(1" Chrolium' dissolved mium' m\um, 

dissolved ,*: ? dissolved dissolved 

(ngrt.) UW (jigrt.) (ngn.)

48 330 7 140

33 230 7 100

26 - 5 120

38 240 8 100

46 - 8 130

56 390 10 190

Cobalt, 

dissolved 

(H9/D

350

220

220

320

350

480

Copper, 

dissolved

<100

<50

<100

<100

<100

<120

Iron, 

dissolved (ng/L)

870,000

440,000

450,000

640,000

760,000

1,000,000

Date

Apr 1996

04...

May

07...

Jun

05...

Jul

03...

Aug

08...

Sep

04...

Lead, 

dissolved

(W/L)

2

2

2

2

1

<4

Lithium, 

dissolve* "risT dSnum, Nickel' Silver'

tW-) (ng/L) (ng/L) u*9"-' u19"-'

520

340

320

410

510

650

750

450

430

620

720

930

<1 870 <10

<1 560 <5.0

<1 490 29

<1 850 <10

<1 830 <10

2 1,100 28

Stronissolved

(^g/D

1,800

1,400

1,200

1,700

1,900

2,300

Vanadium, 

dissolved

72

69

87

62

<60

<72

Zinc, 

dissolved (ng/L)

4,000

2,500

2,300

3,400

4,000

5,100

TABLE 3 49
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 13, 472305110551701-LEWIS COULEE ABOVE CASTNER PARK, AT BELT, MT

Date

Jul 1994

19...

Sep

06...

Oct

14...

Nov

14...

Dec

15...

Jan 1995

12...

Feb

22...

Mar

16...

Apr

12...

May

17...

Jun

13...

Jul

13...

Aug

17...

Sep

14...

Oct

12...

Nov

29...

Jan 1996

12...

Feb

21...

Apr

04...

May

07...

Jun

05...

Jul

03...

Aug

08...

Sep

04...

Time

1500

1100

0910

1145

1545

1020

0900

1000

1810

0845

1015

0950

1000

1120

1010

1120

0945

0925

1200

1500

1310

0920

1130

0920

Streamflow, instantaneous 

(ffrs)

0.02

.01

.009

.004

.002

.008

.008

.006

.009

.01

.02

.01

.01

.02

.01

.01

.01

.01

.02

.02

.01

.01

.009

.01

Specific conductance, 

onsite 

(US/cm)

3,890

3,940

4,100

4,170

4,130

4,250

4,360

4,340

4,660

4,750

4,850

4,820

4,550

4,550

4,500

4,500

4,240

4,190

4,090

4,210

4,180

4,050

4,040

4,070

Temperature, 

air <°C)

23.0

22.0

7.0

5.5

2.5

3.0

7.0

9.0

10.0

16.0

23.0

17.0

17.0

21.0

5.5

9.0

9.0

8.0

9.0

9.0

19.0

23.0

24.0

10.0

Temperature, 

water (°C)

12.5

12.0

9.0

7.5

6.5

7.0

7.5

7.5

9.0

10.5

13.0

14.0

11.5

12.5

10.0-

8.0

7.0

6.5

7.5

10.5

9.0

11.0

13.0

10.0

PH, 

onsite (standard 

units)

2.8

2.7

2.8

2.8

2.8

2.8

2.8

2.7

2.6

2.4

2.6

2.6

2.6

2.6

2.6

2.6

2.6

2.7

2.7

2.7

2.5

2.7

2.7

2.8

Hardness, 

total 

(mg/Las 

CaCO3)

880

850

920

950

900

950

950

970

900

1,000

970

970

950

1,000

920

920

920

950

920

920

920

920

900

960

Calcium, dissolved 

(mg/L)

170

160

170

180

180

180

180

190

180

190

190

190

180

200

170

170

170

180

170

170

170

170

160

170

Magnesium, dissolved 

(mg/L)

110

110

120

120

110

120

120

120

110

130

120

120

120

130

120

120

120

120

120

120

120

120

120

130

Sodium, dissolved 

(mo/L)

25

26

25

26

25

26

25

26

24

26

26

27

26

27

26

26

26

26

27

27

26

26

26

26

Sodium adsorption 

ratio

0.4

.4

.4

.4

.4

.4

.4

.4

.3

.4

.4

.4

.4

.4

.4

.4

.4

.4

.4

.4

.4

.4

.4

.4

50 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 13, 472305110551701-LEWIS COULEE ABOVE CASTNER PARK, AT BELT, MT--Continued

Date

Jul 1994

19...

Sep

06...

Oct

14...

Nov

14...

Dec

15...

Jan 1995

12...

Feb

22...

Mar

16...

Apr

12...

May

17...

Jun

13...

Jul

13...

Aug

17...

Sep

14...

Oct

12...

Nov

29...

Jan 1996

12...

Feb

21...

Apr

04...

May

07...

Jun

05...

Jul

03...

Aug

08...

Sep

04...

Potassium, 

dissolved 

(mg/L)

2.3

2.7

-

2.5

2.7

2.5

2.8

2.4

1.1

1.1

.9

1.1

.8

1.2

1.1

1.7

2.2

2.3

2.1

1.5

1.7

2.5

2.8

2.6

Acidity

48

51

54

56

57

55

57

58

60

62

63

63

61

59

60

60

57

58

53

55

35

52

57

52

Alkalinity, Su|fate

/mri/l ae dissolved (3&? <m^>

e<l 3,600

e<l 3,500

e<l 3,700

e<l 4,000

e<l 4,000

e<l 4,100

e<l 5,700

e<l 4,700

e<l 5,600

e<l 5,100

e<l 5,000

e<l 4,800

e<l 5,100

e<l 4,000

e<l 4,200

e<l 4,200

e<l 3,800

e<l 4,200

e<l 4,200

e<l 4,300

e<l 4,300

e<l 3,800

e<l 3,500

e<l 3,600

Chloride, 

dissolved 

(mg/L)

6.4

14

7.1

7.5

5.7

5.1

16

26

13

14

4.6

5.2

15

4.7

4.5

4.3

9.0

5.8

7.5

6.3

5.6

5.2

7.3

8.5

Fluoride, 

dissolved 

(mg/L)

<1

<l

<l

-

<l

<l

2.1

1.6

1.2

1.6

1.0

<1

<1

<1

-

<1

-

<1

1.2

1.2

<1

<1

1.6

1.6

Silica, 

dissolved 

(mg/L as sTo2)

76

79

87

83

85

86

84

86

83

85

88

87

84

87

80

80

83

84

83

82

74

77

74

82

Solids, 

sum of constituents, 

dissolved 

(mg/L)

e4,700

e4,640

e4,890

e5,250

e5,180

e4,790

e6,960

e6,010

e6,850

e5,880

e5,790

e6,130

e6,390

e5,350

e5,440

e5,670

e5,060

e5,450

e5,400

e5,460

e5,440

e4,940

e4,630

e4,800

Solids, 

dissolved 

(ton/ 

acre-ft)

e6.39

e6.30

e6.66

e7.15

e7.04

e6.51

e9.47

e8.17

e9.31

eS.OO

e7.87

e8.33

e8.69

e7.27

e7.39

e7.71

e6.87

e7.42

e7.34

e7.43

e7.40

e6.72

e6.29

e6.53

Solids, 

dissolved 

(ton/d)

eO.28

e.15

e.12

e.06

e.03

e.10

e.15

e.10

e.17

e.17

e.39

e.23

e.19

e.22

e.21

e.18

e.14

e.15

e.25

e.22

e.21

e.13

e.ll

e.14

TABLE 3 51
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 13, 472305110551701-LEWIS COULEE ABOVE CASTNER PARK, AT BELT, MT--Continued

Date

Jul 1994

19...

Sep

06...

Oct

14...

Nov

14...

Dec

15...

Jan 1995

12...

Feb

22...

Mar

16...

Apr

12...

May

17...

Jun

13...

Jul

13...

Aug

17...

Sep

14...

Oct

12...

Nov

29...

Jan 1996

12...

Feb

21...

Apr

04...

May

07...

Jun

05...

Jul

03...

Aug

08...

Sep

04...

Aluminum, 

dissolved 

(H9/I-)

250,000

270,000

280,000

290,000

260,000

250,000

310,000

310,000

330,000

320,000

340,000

320,000

320,000

320,000

290,000

530,000

310,000

310,000

280,000

280,000

260,000

260,000

250,000

270,000

Arsenic, 

dissolved 

(H9/I-)

<l

2

2

2

1

2

1

1

<1

<1

<1

<5

<5

<25

<5

<1

<2

<1

<1

<1

<1

<1

<5

<1

Barium, 

dissolved 

(H9/L)

<5

<3

<5

<10

<3

<4

<3

<3

<3

17

<10

<10

<10

<10

13

17

20

17

18

15

16

17

16

14

Beryllium, 

dissolved

21

20

21

21

21

23

22

22

24

31

28

21

26

24

23

22

22

20

21

24

22

21

22

24

Boron, 

dissolved 

(H9/L)

220

270

270

290

310

250

250

250

270

260

290

270

320

270

290

270

260

250

250

260

~

-

~

230

Cadmium, 

dissolved 

(WI/1-)

29

50

<11

50

9

58

38

38

44

50

62

63

64

65

48

46

33

37

39

44

42

39

38

45

Chromium, 

dissolved

110

100

110

150

130

130

120

120

130

120

180

170

190

150

130

120

130

120

100

130

140

110

110

100

Cobalt, 

dissolved 

(H9/L)

2,200

1,100

5,900

1,300

4,400

1,700

980

1,000

1,000

1,000

1,100

950

1,000

950

950

770

910

2,400

750

1,000

900

900

910

790

Copper, 

dissolved 

(H9/L)

80

50

60

<100

60

60

60

40

90

120

200

150

180

150

100

100

70

70

60

70

70

80

80

<80

Iron, 

dissolved 

(H9/L)

450,000

460,000

470,000

530,000

490,000

520,000

510,000

530,000

490,000

500,000

550,000

560,000

530,000

560,000

530,000

520,000

520,000

510,000

490,000

460,000

480,000

470,000

470,000

500,000

52 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water In the Sand Coulee Coal 

Area, Montana
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 13, 472305110551701-LEWIS COULEE ABOVE CASTNER PARK, AT BELT, MT-Continued

Date

Jul 1994

19...

Sep

06...

Oct

14...

Nov

14...

Dec

15...

Jan 1995

12...

Feb

22...

Mar

16...

Apr

12...

May

17...

Jun

13...

Jul

13...

Aug

17...

Sep

14...

Oct

12...

Nov

29...

Jan 1996

12...

Feb

21...

Apr

04...

May

07...

Jun

05...

Jul

03...

Aug

08...

Sep

04...

Lead, Lithium, 

dissolved dissolved 

(|ig/L) (H9/L)

<10 390

<10 420

<10 430

<10 520

<10 470

<10 480

3 470

2 450

<1 500

<1 480

1 470

<1 470

<1 430

<1 450

<1 440

<1 460

<1 440

2 460

<1 450

<1 470

<1 430

<1 430

<1 410

1 420

Manganese, 

dissolved

840

880

900

960

920

960

930

960

920

950

1,000

1,000

980

1,000

920

920

910

880

900

880

870

880

850

940

Molyb- Nj k - Seledenum, M,,~^h,Lt nium, 

dissolved diJ5Jjyd dissolved

<10 1,800 <5

<10 1,800 <5

<10 2,000 <1

<10 2,100 <10

<10 2,100 <1

<10 2,200 <l

<1 2,100 <1

<1 2,100 <1

<1 2,000 <1

<1 2,200 <1

1 2,200 <5

<1 2,100

<1 2,200

<1 2,200

<1 2,100

<1 2,100

<1 2,200

<1 2,100

<1 2,100

<1 2,100

<1 1,900

<1 2,000

<1 2,000

<1 2,100

Silver, 

dissolved

<5

<3

<5

<10

<3

<4

<3

<3

<3

<10

11

10

<10

<10

<10

<5

<5

<5

<5

<5

<8

<8

<8

8

Strontium, 

dissolved

1,300

1,400

1,400

1,400

1,400

1,600

1,500

1,600

1,400

1,600

1,500

1,500

1,600

1,500

1,500

1,600

1,500

1,500

1,500

1,500

1,500

1,500

1,500

1,500

Vanadium, 

dissolved

110

130

130

140

130

150

<60

<60

38

<60

<60

<60

92

72

100

42

40

38

41

31

<48

43

47

<48

Zinc, 

dissolved

6,500

6,500

7,300

7,600

7,300

7,700

8,000

8,100

8,000

7,600

8,000

7,700

7,500

8,300

7,400

7,400

7,700

7,600

7,400

7,000

7,000

7,100

6,800

7,200

TABLE 3 53
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 14, 472306111103601--MINE DRAIN TO MINING COULEE NEAR SAND COULEE, MT

Date

Jul 1994

20...

Aug

17...

Sep

06...

Oct

13...

Nov

14...

Dec

15...

Jan 1995

11...

Feb

21...

Mar

15...

Apr

12...

May

16...

Jun

13...

Jul

11...

Aug

16...

Sep

13...

Oct

11...

Nov

28...

Jan 1996

11...

Feb

22...

Apr

03...

May

07...

Jun

04...

Jul

02...

Aug

06...

Sep

03...

Time

1455

1300

1750

1150

1620

1255

1540

1410

1530

1350

1050

1520

1730

1550

0830

1630

1430

0800

0900

1310

0850

1620

0910

1715

1510

Streamflow, instantaneous 

(ft3/*)

0.02

.02

.02

.01

.01

.01

.01

.01

.01

.009

.010

.009

.009

.02

.03

.04

.03

.02

.02

.02

.02

.02

.01

.01

.01

Specific conductance, 

onsite 

(uS/cm)

6,680

7,520

7,410

7,400

7,620

7,250

7,250

7,280

7,310

7,260

7,290

7,210

7,390

7,290

7,300

7,430

7,240

7,280

7,320

7,240

7,300

7,340

7,230

7,500

7,350

Temperature, 

air (°C)

28.0

28.0

25.0

11.5

3.5

3.0

5.5

18.0

13.0

16.0

16.0

25.5

16.0

23.0

9.0

14.0

-2.0

5.0

1.0

2.0

2.5

24.0

20.0

23.0

24.0

Temperature, 

water (°C)

10.5

11.0

11.0

10.0

9.0

7.5

8.0

8.0

9.0

8.0

14.5

9.0

9.5

10.5

11.0

11.0

9.0

9.0

8.0

7.5

8.5

9.5

10.0

10.5

10.0

pH, 

onsite (standard 

units)

2.6

2.6

2.4

3.0

2.6

2.6

2.6

2.6

2.6

2.6

2.6

2.7

2.7

2.6

2.6

2.5

2.5

2.6

2.5

2.5

2.6

2.6

2.6

2.5

2.7

Hardness, 

total 

(mo/Las 

CaC03)

1,400

1,600

1,500

1,500

1,600

1,500

1,500

1,500

1,600

1,600

1,500

1,600

1,500

1,500

1,300

1,500

1,500

1,600

1,600

1,500

1,600

1,600

1,600

1,500

1,500

Calcium, dissolved 

(mg/L)

230

280

270

280

290

270

280

270

300

300

290

310

290

290

210

270

270

310

290

290

310

300

280

270

280

Magnesium, dissolved 

(mg/L)

210

210

210

200

220

200

200

190

200

200

200

200

190

200

190

200

200

210

210

200

200

210

210

200

200

Sodium, dissolved 

(mg/L)

19

19

20

19

20

20

17

19

20

20

19

22

20

21

23

20

21

21

21

21

20

21

22

19

21

Sodium adsorption 

ratio

0.2

.2

.2

.2

.2

.2

.2

.2

.2

.2

.2

.2

.2

.2

.3

.2

.2

.2

.2

.2

.2

.2

.2

.2

.2

54 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
Table 3. Water-quality data for sites in 

SITE 14, 472306111103601-

the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

-MINE DRAIN TO MINING COULEE NEAR SAND COULEE, MT--Continued

Date

Jul 1994

20...

Aug

17...

Sep

06...

Oct

13...

Nov

14...

Dec

15...

Jan 1995

11...

Feb

21...

Mar

15...

Apr

12...

May

16...

Jun

13...

Jul

11...

Aug

16...

Sep

13...

Oct

11...

Nov

28...

Jan 1996

11...

Feb

22...

Apr

03...

May

07...

Jun

04...

Jul

02...

Aug

06...

Sep

03...

Potassium, 

dissolved 

(mg/L)

0.2

.2

.1

.2

<.l

.2

.4

.2

.3

.2

.3

.3

.2

.4

.4

.2

.2

.1

.2

<.l

.2

.1

.2

.2

.2

Acidity

150

160

150

150

150

150

150

150

150

150

150

150

150

150

140

150

150

160

150

150

150

150

150

150

150

Alkalinity, Su|fate 

/ JS i »« dissolved 

(&% < »**

e<l 9,200

e<l 8,900

e<l 9,800

e<l 9,800

e<l 9,400

e<l 9,800

e<l 9,600

e<l 11,000

e<l 12,000

e<l 12,000

e<l 11,000

e<l 9,600

e<l 9,500

e<l 9,700

e<l 9,800

e<l 9,400

e<l 8,900

e<l 9,300

e<l 10,000

e<l 10,000

e<l 10,000

e<l 11,000

e<l 9,200

e<l 8,900

e<l 8,700

s* ftS? <m<^ °$oj"

<1 71

<1 55

<1 72

1.4 130

98

93

8.4 57

2.6 120

<1 130

3.7 130

2.6 130

<1 130

<1 140

1.7 140

..

5.0 130

<1 130

140

140

4.1 140

1.8 140

<1 140

<1 130

3.8 120

3.7 130

Solids, 

sum of constituents, 

dissolved 

(mg/L)

el 1,800

el 1,600

el 2,500

e!2,400

el2,100

e!2,500

e!2,300

el 3,500

el 4,600

e!4,600

el 3,600

e!2,300

e!2,100

e!2,300

el2,300

el 1,900

el 1,500

e!2,100

el 2,800

e!2,700

e!2,600

e!3,700

el 1,800

el 1,400

ell,200

Solids, 

dissolved 

(ton/ 

acre-ft)

e!6.0

e!5.8

el 7.1

el 6.8

el 6.4

e!7.0

e!6.7

el 8.3

e!9.8

e!9.8

e!8.5

e!6.8

16.4

16.7

e!6.7

el 6.2

el 5.6

el 6.5

el 7.3

el 7.3

e!7.1

el 8.7

e!6.0

el 5.5

el 5.3

Solids, 

dissolved 

(ton/d)

eO.54

e.57

e.61

e.37

e.42

e.41

e.32

e.47

e.43

e.35

e.38

e.30

e.29

e.73

e.93

el. 16

e.93

e.79

e.79

e.65

e.61

e.59

e.45

e.40

e.36

TABLE 3 55
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 14, 472306111103601-MINE DRAIN TO MINING COULEE NEAR SAND COULEE, MT--Continued

Date

Jul 1994

20...

Aug

17...

Sep

06...

Oct

13...

Nov

14...

Dec

15...

Jan 1995

11...

Feb

21...

Mar

15...

Apr

12...

May

16...

Jun

13...

Jul

11...

Aug

16...

Sep

13...

Oct

11...

Nov

28...

Jan 1996

11...

Feb

22...

Apr

03...

May

07...

Jun

04...

Jul

02...

Aug

06...

Sep

03...

Aluminum, 

dissolved 

(WI/L)

900,000

910,000

920,000

880,000

890,000

890,000

910,000

860,000

890,000

880,000

870,000

910,000

860,000

880,000

890,000

870,000

900,000

990,000

930,000

920,000

880,000

880,000

890,000

860,000

860,000

Arsenic, 

dissolved 

(H9/L)

2

2

2

1

1

<1

3

<10

<10

<10

<5

5

<5

10

12

<5

4

<2

3

<2

<5

<10

<5

4

1

Barium, 

dissolved 

(H9/L)

<100

<100

<100

<100

<100

<100

<100

<100

<100

<100

74

<100

<100

<100

<100

72

74

85

<100

80

78

74

73

77

75

Beryllium, 

dissolved 

(MI/L)

50

60

60

92

80

70

80

95

94

92

97

99

71

100

40

95

85

97

100

99

97

100

93

97

97

Boron, 

dissolved 

(ug/L)

770

760

850

710

800

890

860

720

730

740

730

730

710

830

730

730

660

740

680

760

840

450

370

320

220

Cadmium, 

dissolved 

<ug/L)

83

87

86

-

75

74

98

83

88

84

87

85

86

83

85

77

86

73

88

71

90

90

90

87

83

Chromium, 

dissolved 

<WP/L)

300

280

340

280

390

370

320

310

320

320

340

360

340

370

310

330

320

350

400

320

310

300

180

<130

290

Cobalt, 

dissolved 

<ug/L)

3,500

3,600

3,400

4,800

2,900

3,000

3,500

3,300

3,200

3,200

3,100

4,500

3,700

3,700

3,800

3,400

3,700

7,600

9,500

5,400

3,800

3,600

3,600

3,900

3,900

Copper, 

dissolved 

(ug/L)

120

110

100

110

81

75

79

100

<100

<100

<100

<200

<200

<200

<200

120

<100

<100

<200

<100

<100

<250

<250

<250

<200

Iron, 

dissolved 

(MI/L)

1,100,000

1,200,000

1,200,000

1,000,000

1,100,000

1,200,000

1,100,000

950,000

1,000,000

1,000,000

970,000

1,100,000

980,000

990,000

1,100,000

940,000

990,000

1,100,000

1,100,000

1,100,000

990,000

1,100,000

1,100,000

1,000,000

1,000,000

56 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water In the Sand Coulee Coal 

Area, Montana
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 14, 472306111103601-MINE DRAIN TO MINING COULEE NEAR SAND COULEE, MT-Continued

Date

Jul 1994

20...

Aug.

17...

Sep

06...

Oct

13...

Nov

14...

Dec

15...

Jan 1995

11...

Feb

21...

Mar

15...

Apr

12...

May

16...

Jun

13...

Jul

11...

Aug

16...

Sep

13...

Oct

11...

Nov

28...

Jan 1996

11...

Feb

22...

Apr

03...

May

07...

Jun

04...

Jul

02...

Aug

06...

Sep

03...

Lead, Lithium, 

dissolved dissolved

<1 UOO

<1 UOO

<1 UOO

<10 UOO

<1 1,300

<1 UOO

<1 UOO

<1 UOO

<1 UOO

<1 1,200

<1 UOO

<1 1,300

<1 UOO

<1 1,100

<1 1,500

<1 1,100

<1 UOO

<1 UOO

<1 1,100

<1 UOO

<1 UOO

<1 UOO

<i uoo

<i uoo

<8 1,300

Manganesa, 

dissolved

3,400

-

3,000

3,400

3,300

2,900

3,400

3,200

3,400

3,400

3,400

3,500

3,300

3,500

2,900

3,300

3,400

3,900

3,600

3,600

3,700

3,600

3,400

3,400

3,400

Molybdenum, 

dissolved

<5

<l

<l

<10

<1

2

1

<2

2

<2

3

<2

2

1

1

2

2

2

3

<1

2

<1

2

3

1

Nickel, 

dissolved

7,700

8,100

7,800

7,500

7,200

8,100

8,700

7300

7,600

7300

7,900

8,000

7300

7,800

7,600

7,400

7,600

8,700

8,200

8,000

8300

8,100

8,000

7,600

7,900

Selenium, Silver, 

dissolved dissolved 

(lig/L) (l*9/L)

<10 <1

<5 <1

<10 <1

<2 <10

<2 <1

<1 <1

<2 <1

<2 <4

<1 <10

<1 <10

<2 <10

<2 <20

<20

<20

<20

<10

- <10

12

54

<10

<10

<25

<25

<25

<20

Strontium, 

dissolved

1,100

1,200

uoo

uoo

1,300

1,200

1300

uoo

uoo

1,200

uoo

1,300

1,200

UOO

1,200

1,200

UOO

1,300

UOO

1,300

1,200

1,300

UOO

1,200

1,200

Vanadium, 

dissolved 

(H9/L)

-

-

-

490

~

~

-

320

320

320

400

350

370

240

230

340

450

340

330

390

370

380

<120

Zinc, 

dissolved 

(H9/L)

32,000

32,000

34,000

33,000

35,000

34,000

36,000

33,000

32,000

32,000

32,000

35,000

32,000

33,000

33,000

32,000

32,000

38,000

35,000

34,000

35,000

36,000

35,000

35,000

33,000

TABLE 3 57
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 15, 472310110550801--LEWIS COULEE ABOVE MINE ADIT, AT BELT, MT

Date

Apr 1995 

12... 

May 

17... 

Jun 

13... 

Jul 

13...

Stream- Specific T.m«ar T*mnar. PH, Hard- /»«i^i,,« Magne- C«HI,,«. flow, conduc- T'm,P?r' 12J£* ohslte ness, CaKm' slJm, S<S,Lum' 

Time instan- tance, a , ' fj" ; (stand- total ** dis- J%* 

taneous onslte JJL waJ£r ard (mg/L as *° ?* solved f°*K 

(f?/s) (uS/cm) (C) (C) units) CaCO3) t"1^) (mg/L) (m9/L>

1840 0.22 

0920 .22 

1040 .11 

1030 .28

735 

818 

905 

1300

10.0 8.5 8.1 350 53 52 

18.0 9.5 8.3 400 59 61 

18.5 14.5 8.6 450 65 70 

17.0 14.0 8.6 600 100 85

18 

18 

25 

62

Sodium adsorption 

ratio

0.4 

.4 

.5 

1

Date

Apr 1995 

12... 

May 

17... 

Jun 

13... 

Jul 

13...

Potas- A_wifc. 

slum, fJSR. dissolved <mfft as 

(mg/L) H >

6.2 <0.1 

4.3 <.l 

4.9 <.l 

7.9 <.l

Alkalinity, 

iab 

(mg/L as 

CaC03)

271 

313 

325 

335

Sulfate, 

dissolved 

(mg/L)

100 

100 

130 

390

Chloride, 

dissolved 

(mg/L)

12 

14 

17 

17

Fluoride, 

dissolved 

(mg/L)

0.4 

.5 

.5 

.3

Silica, 

dissolved

8.5 

7.6 

8.1 

12

Solids, 

sum of constituents, 

dissolved 

(mg/L)

413 

453 

516 

877

Solids, 

dissolved 

(ton/ 

acre-ft)

0.56 

.62 

.70 

1.19

Solids, 

dissolved 

(ton/d)

0.25 

.27 

.15 

.66

Date

Apr 1995 

12... 

May 

17... 

Jun 

13... 

Jul 

13...

! > » Arsenic, 

diiSSed -"JIJJJ20 1 

20 <1

20 1

Barium, 

dissolved

93 

110 

110 

170

Beryllium, 

dissolved

<0.5

Boron, 

dissolved

40 

50 

50 

110

Cadmium, 

dissolved

2

Chromium, 

dissolved

<5 

<5 

<5 

<5

Cobalt, 

dissolved

<3 

3 

<3

Copper, 

dissolved

<10 

<10

<10

Iron, 

dissolved

18 

5 

130 

48

Date

Jul 1994 

12... 

May 

17... 

Jun 

13... 

Jul 

13...

Lead, Lithium, 

dissolved dissolved

<1 35 

10 43 

<10 54 

<10 110

Manganese, 

dissolved

4 

2

5

Molybdenum, 

dissolved

2 

<10 

<10

Nickel, 

dissolved

<10 

<10

Selenium, 

dissolved

2 

3 

2

Silver, 

dissolved

2

Strontium, 

dissolved

380 

460 

540 

1,000

Vanadium, 

dissolved

<6 

<6 

<6 

<6

Zinc, 

dissolved

<3

6 

10 

<3

58 Water-Quality Data (July 1094 through September 1006) and Statistical Summaries of Data for Surface Water In the Sand Coulee Coal 

Araa, Montana
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 16, 472313111104901-MINE DRAIN TO SAND COULEE NEAR SAND COULEE, MT

Date

Jul 1994

20...

Aug

17...

Sep

06...

Oct

13...

May 1995

16...

Jun

13...

Jul

11...

Aug

16...

Sep

13...

Oct

11...

Nov

28...

Jan 1996

11...

Feb

22...

Apr

03...

May

07...

Jun

04...

Jul

02...

Aug

06...

Sep

03...

Time

1430

1220

1730

1130

1115

1500

1700

1520

0850

1615

1450

0830

0815

1330

0920

1645

0850

1650

1445

Streamflow, instantaneous 

(ftS/s)

0.03

.02

.01

.006

.06

.11

.11

.08

.06

.05

.03

.02

.02

.008

.01

.05

.036

.017

.009

Specific conductance, 

onsite 

(nS/cm)

3,340

3,390

3,220

3,110

3,100

3,420

3,480

3,410

3,400

3,410

3,290

3,240

3,160

3,140

3,160

3,340

3,360

3,280

3,180

Temperature, 

air (°C)

20.0

28.0

28.0

10.0

12.0

22.0

15.5

22.0

10.0

16.0

-4.0

5.0

1.0

3.0

3.5

25.0

20.0

23.0

15.5

Temperature, 

water (°C)

12.5

13.0

11.5

9.5

11.0

11.5

10.0

10.5

10.0

10.0

9.0

9.0

7.5

12.5

8.5

11.0

9.5

11.5

23.0

pH, 

onsite (standard 

units)

3.1

3.0

2.9

3.3

3.0

3.2

3.4

3.3

3.2

3.2

3.2

3.1

3.1

3.0

3.2

3.1

3.2

3.2

3.1

Hardness, 

total 

(mg/Las 

CaC03)

950

880

810

810

790

860

900

900

880

850

850

810

810

840

810

840

880

850

810

Calcium, dissolved 

(mg/L)

180

170

160

160

160

180

180

180

170

160

160

160

160

170

160

170

170

160

160

Magnesium, dissolved 

(mg/L)

120

110

100

100

95

100

110

110

110

110

110

100

100

100

100

100

110

110

100

Sodium, dissolved 

(mg/L)

19

18

18

18

18

20

21

20

20

20

19

19

19

19

19

19

18

19

19

Sodium adsorption 

ratio

0.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

TABLE 3 59
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 16, 472313111104901-MINE DRAIN TO SAND COULEE NEAR SAND COULEE, MT--Continued

Date

Jul 1994

20...

Aug

17...

Sep

06...

Oct

13...

May 1995

16...

Jun

13...

Jul

11...

Aug

16...

Sep

13...

Oct

11...

Nov

28...

Jan 1996

11...

Feb

22...

Apr

03...

May

07...

Jun

04...

Jul

02...

Aug

06...

Sep

03...

Potassium, 

dissolved 

(mg/L)

1.6

1.8

1.7

1.7

1.8

2.0

1.9

2.0

1.7

1.6

1.6

1.7

1.8

1.8

2.0

1.7

2.0

1.9

1.9

Acidity 

(mg/L as

42

43

42

37

35

44

43

43

43

44

43

40

39

38

37

41

43

44

37

Alkalinity, Su|fate 

/mn/i »« dissolved (?3&S (m9/L)

e<l 3,000

e<l 3,000

e<l 3,200

e<l 3,000

e<l 3,000

e<l 3,500

e<l 3,400

e<l 3,600

e<l 3,100

e<] 3,000

e<l 2,900

e<l 2,900

e<l 2,700

e<] 2,800

e<l 2,900

e<l 2,900

e<l 3,000

e<l 2,800

e<l 2,700

Chloride, 

dissolved 

(mg/L)

3.9

4.4

15

9.6

12

13

4.2

13

4.8

4.4

4.7

8.8

5.2

5.5

5.7

4.9

4.6

5.2

12

Fluoride, 

dissolved 

(mg/L)

<l

<l

<l

2.2

3.1

2.8

<1

<1

<1

1.6

<1

1.3

1.8

2.1

1.8

1.1

1.0

2.4

2.2

Silica, 

dissolved 

(mg/L as 

SiO2)

53

70

66

65

63

71

70

69

66

64

61

64

64

65

63

63

69

60

59

Solids, 

sum of constituents, 

dissolved 

(mg/L)

e3,990

e3,970

e4,120

e3,570

e3,840

e4,550

e4,490

e4,650

e4,130

e3,980

e3,880

e3,880

e3,610

e3,710

e3,800

e3,840

e4,020

e3,740

e3,590

Solids, 

dissolved 

(ton/ 

acre-ft)

e5.42

e5.40

e5.60

e4.86

e5.22

e6.18

e6.10

e6.33

e5.62

e5.41

e5.28

e5.28

e4.91

e5.05

e5.16

e5.23

e5.47

e5.08

e4.88

Solids, 

dissolved 

(ton/d)

eO.32

e.19

e.13

e.06

e.63

el.35

el.33

el.Ol

e.69

e.51

e.31

e.21

e.19

e.08

e.10

e.52

e.39

e.17

e.09

60 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 16, 472313111104901--MINE DRAIN TO SAND COULEE NEAR SAND COULEE, MT-Continued

Date

Jul 1994

20...

Aug

17...

Sep

06...

Oct

13...

May 1995

16...

Jun

13...

Jul

11...

Aug

16...

Sep

13...

Oct

11...

Nov

28...

Jan 1996

11...

Feb

22...

Apr

03...

May

07...

Jun

04...

Jul

02...

Aug

06...

Sep

03...

Aluminum, 

dissolved 

(H9/L)

250,000

240,000

220,000

200,000

180,000

250,000

270,000

250,000

250,000

230,000

250,000

250,000

210,000

210,000

210,000

220,000

240,000

210,000

210,000

Arsenic, 

dissolved 

(H9/L)

4

5

4

4

<1

11

4

<5

8

4

2

8

4

5

8

1

8

1

3

Barium, 

dissolved 

(H9/L)

<4

3

4

3

25

8

11

8

8

29

28

28

25

26

23

27

30

27

26

Beryllium, 

dissolved 

(H9/L)

34

30

28

27

26

34

33

34

34

31

29

28

29

28

31

29

34

32

29

Boron, 

dissolved 

(H9/L)

310

270

320

250

250

300

300

360

300

310

290

260

270

270

330

230

-

170

130

Cadmium, 

dissolved (ng/L)

18

50

39

-

25

33

30

31

31

29

30

30

25

24

27

30

31

27

27

Chromium, 

dissolved 

(H9/L)

100

90

80

70

60

80

90

100

90

90

80

80

70

70

60

90

90

70

60

Cobalt, 

dissolved (ng/L)

2,000

2,300

1,500

1,400

800

1,100

1,100

1,200

1,200

1,100

1,100

1,700

1,900

1,600

1,000

1,000

1,100

1,000

1,000

Copper, 

dissolved (ng/L)

<40

<30

<30

<30

<30

<40

<50

<50

<40

<50

<50

<50

<50

<30

<30

<60

<60

<60

<60

Iron, 

dissolved (ng/U

340,000

340,000

320,000

290,000

290,000

390,000

410,000

390,000

390,000

370,000

360,000

360,000

330,000

320,000

320,000

360,000

390,000

350,000

310,000

TABLE 3 61
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 16, 472313111104901--MINE DRAIN TO SAND COULEE NEAR SAND COULEE, MT--Continued

Date

Jul 1994

20...

Aug

17...

Sep

06...

Oct

13...

May 1995

16...

Jun

13...

Jul

11...

Aug

16...

Sep

13...

Oct

11...

Nov

28...

Jan 1996

11...

Feb

22...

Apr

03...

May

07...

Jun

04...

Jul

02...

Aug

06...

Sep

03...

Lead, Lithium, 

dissolved dissolved 

(ug/L) (ug/L)

<10 390

<10 370

<10 360

<10 330

<1 330

<1 400

<1 380

<1 400

<1 380

<1 370

<1 370

<1 350

<1 310

<1 350

<1 360

<1 380

<1 360

<1 370

<2 360

Manganese, 

dissolved 

(ug/L)

1,300

1,300

1,200

1,100

1,100

1,400

1,400

1,400

1,400

1,300

1,300

1,300

1,200

1,200

1,200

1,300

1,400

1,300

1,200

nin'Xm Nicke|. Selenium, 

dtesoZri dissolved dissolved S3EF (ug/L) (ug/L)

<10 2,600 <2

<10 2,400 <5

<10 2,300 <5

<10 2,200 <2

<1 2,100 <1

<1 2,500 <2

<1 2,600

<1 2,600

<1 2,500

1 2,500

<1 2,300

<1 2,400

<1 2,300

<1 2,200

2 2,200

<1 2,300

<1 2,500

<1 2,300

1 2,200

Silver, 

dissolved 

(ug/L)

<4

3

<3

<3

<3

<4

<5

<5

<4

<5

<5

<5

<5

<3

<3

<6

<6

<6

Strontium, 

dissolved 

(ug/L)

1,100

1,000

990

940

950

1,100

1,100

1,100

1,100

1,100

1,100

1,000

970

1,000

1,000

1,000

1,000

1,000

1,000

Vanadium, 

dissolved 

(ug/L)

160

160

150

130

72

120

97

110

110

110

110

92

94

68

80

95

98

<36

<36

Zinc, 

dissolved 

(ug/L)

12,000

11,000

10,000

9,500

9,200

11,000

11,000

11,000

11,000

11,000

10,000

10,000

10,000

9,800

9,200

11,000

11,000

9,700

9,600

62 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 17, 472330111082801-CENTERVILLE WETLANDS INFLOW AT CENTERVILLE, MT

Date

Jul 1994

20...

Aug

16...

Sep

06...

Oct

13...

Nov

14...

Dec

15...

Jan 1995

11...

Feb

22...

Mar

15...

Apr

12...

May

16...

Jun

12...

Jul

12...

Aug

16...

Sep

13...

Oct

10...

Nov

27...

Jan 1996

10...

Feb

20...

Apr

02...

May

07...

Jun

03...

Jul

01...

Aug

06...

Sep

03...

Time

1550

1735

1340

1455

1530

1005

1220

1055

1700

1230

1430

1645

0950

0900

1500

1550

1045

0945

1045

1630

0750

1530

1420

1350

1200

Streamflow, instantaneous 

(ft5/*)

0.01

.02

.01

.01

.01

.01

.01

.01

.01

.01

.02

.02

.02

.02

.02

.02

.02

.02

.02

.02

.02

.02

.01

.01

.01

Specific conductance, 

onstte 

(US/cm)

3,220

3,330

3,170

3,300

3,380

3,290

3,390

3,270

3,360

3,690

3,650

3,530

3,100

2,970

2,990

3,140

3,270

3,350

3,360

3,560

3,410

3,440

3,240

3,160

3,160

Temperature, air <°C)

29.0

28.0

29.5

14.0

6.0

1.0

7.0

11.5

11.0

15.0

18.0

28.0

17.0

18.0

25.0

17.0

-8.0

4.0

9.0

11.0

2.0

25.0

30.0

22.0

19.0

Temperature, 

water <°C)

11.5

12.5

12.0

11.0

9.0

8.5

8.0

7.5

7.5

8.0

11.0

12.0

10.5

10.5

11.5

10.5

9.0

8.0

7.5

7.5

8.0

9.5

10.0

11.0

11.5

pH, 

onsite (standard 

units)

2.7

2.6

2.5

2.6

2.6

2.6

2.8

2.6

2.6

2.6

2.6

2.7

2.7

2.7

2.7

2.6

2.6

2.6

2.6

2.5

2.6

2.6

2.5

2.5

2.6

Hardness, 

total 

(mg/Las 

CaC03)

790

760

760

790

810

740

760

790

780

920

1,100

970

680

710

610

680

690

710

720

770

730

800

710

650

670

Calcium, dissolved 

(mg/L)

180

170

170

180

190

170

170

180

180

220

260

230

150

160

130

150

150

160

160

180

170

180

160

140

140

Magnesium, dissolved 

(mg/L)

83

82

80

83

82

76

82

82

81

90

100

95

73

75

70

75

76

75

77

78

73

84

76

73

78

Sodium, dissolved 

(mg/L)

14

15

15

14

15

14

14

15

14

14

13

15

15

15

15

15

15

15

15

14

13

14

14

15

16

Sodium adsorption 

ratio

0.2

.2

.2

.2

.2

.2

.2

.2

.2

.2

.2

.2

.3

.2

.3

.2

.2

.2

.2

.2

.2

.2

.2

.3

.3

TABLE 3 63
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, July 1994 through September 1996 (Continued) 

SITE 17, 472330111082801--CENTERVILLE WETLANDS INFLOW AT CENTERVILLE, MT--Continued

Dste

Jul 1994

20...

Aug

16...

Sep

06...

Oct

13...

Nov

14...

Dec

15...

Jan 1995

11...

Feb

22...

Mar

15...

Apr

12...

May

16...

Jun

12...

Jul

12...

Aug

16...

Sep

13...

Oct

10...

Nov

27...

Jan 1996

10...

Feb

20...

Apr

02...

May

07...

Jun

03...

Jul

01...

Aug

06...

Sep

03...

Potassium, 

dissolved 

(mg/L)

1.0

1.1

1.0

1.0

1.1

1.0

1.0

.8

1.0

1.2

1.9

1.7

1.1

1.3

1.4

1.0

.9

.9

.9

.8

1.1

.9

.2

1.2

1.0

Acidity 

(mg/L as

42

41

40

40

42

42

42

43

42

45

44

44

34

33

35

37

42

44

43

77

44

44

46

39

38

Alkalinity, Su|fatej 

/nJT/i a. dissolved (3fc? ^

e<l 2,800

e<l 2,900

e<l 3,100

e<l 3,000

e<l 2,900

e<l 2,900

e<l 2,900

e<l 3,600

e<l 3,700

e<l 4,000

e<l 4,400

e<l 3,300

e<l 2,500

e<l 2,500

e<l 2,400

e<l 2,500

e<l 2,700

e<l 2,900

e<l 2,700

e<l 3,200

e<l 3,100

e<l 2,900

e<l 2,800

e<l 2,700

e<l 2,500

Chloride, 

dissolved 

(mg/L)

2.2

7.5

8.1

3.5

3.2

2.2

1.8

9.1

3.2

5.4

9.7

2.4

2.4

9.4

2.8

2.1

2.5

7.2

2.8

3.3

2.1

2.6

1.4

4.0

2.9

Fluoride, 

dissolved 

(mg/L)

<l

<l

<l

1.5

1.3

<1

1.5

1.4

<1

1.6

2.4

1.0

<1

<1

1.3

1.0

<1

~

<1

1.0

1.0

<1

<1

1.3

1.0

Silica, 

dissolved 

(mg/L as 

SiOa)

86

87

86

89

86

85

83

86

87

88

93

94

75

74

67

72

74

79

79

85

80

82

84

76

78

Solids, 

sum of constituents, 

dissolved 

(mg/L)

e3,650

e3,740

e3,920

e3,810

e3,750

e3,730

e3,720

e4,470

e4,540

e4,900

e5,330

e4,230

e3,200

e3,200

e3,070

e3,210

e3,480

e3,750

e3,520

e4,120

e3,940

e3,760

e3,630

e3,460

e3,260

Solids, 

dissolved 

(ton/ 

scre-tt)

e4.96

e5.08

e5.33

e5.19

e5.10

e5.07

e5.06

e6.08

e6.18

e6.66

e7.25

e5.75

e4.36

e4.35

e4.18

e4.37

e4.73

e5.ll

e4.79

e5.60

e5.35

e5.ll

e4.94

e4.70

e4.44

Solids, 

dissolved 

(ton/d)

eO.13

e.17

e.14

e.13

e.13

e.12

e.13

e.14

e.15

e.24

e.33

e.21

e.16

e.17

e.16

e.17

e.18

e.17

e.17

e.20

e.16

e.16

e.14

e.13

e.12

64 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 17, 472330111082801--CENTERVILLE WETLANDS INFLOW AT CENTERVILLE, MT--Continued

Date

Jul 1994

20...

Aug

16...

Sep

06...

Oct

13...

Nov

14...

Dec

15...

Jan 1995

11...

Feb

22...

Mar

15...

Apr

12...

May

16...

Jun

12...

Jul

12...

Aug

16...

Sep

13...

Oct

10...

Nov

27...

Jan 1996

10...

Feb

20...

Apr

02...

May

07...

Jun

03...

Jul

01...

Aug

06...

Sep

03...

Alum- Ar«Anir iMitm* Mrscniv,

diSed a****** 

(ug/L) <«""->

230,000 <1

220,000 <1

220,000 <1

210,000 <1

230,000 <1

220,000 <1

230,000 <1

230,000 <1

220,000 <1

250,000 <1

250,000 <1

250,000 <1

190,000 3

190,000 <1

200,000 <1

190,000 <1

230,000 <1

250,000 <2

220,000 <1

260,000 <1

240,000 <1

230,000 <1

230,000 <2

200,000 <1

190,000 <1

Barium, 

dissolved

6

7

6

7

6

6

5

6

5

7

12

7

5

7

7

11

11

12

9

12

11

11

<10

11

8

Beryllium, 

dissolved

33

31

30

31

31

30

30

31

31

34

36

37

25

27

24

26

28

29

31

34

30

33

34

30

30

Boron, 

dissolved

200

210

210

180

210

220

220

170

180

200

190

190

140

170

180

180

190

190

180

200

210

130

--

--

--

Cadmium, 

dissolved 

(H9/L)

-

11

14

-

14

-

13

29

32

32

31

32

23

23

23

25

27

30

27

25

31

32

31

28

27

Chromium, 

dissolved

20

20

20

20

30

20

<20

<20

<20

20

20

<20

<20

10

20

30

<20

30

40

20

20

<25

<36

<30

<30

Cobalt, 

dissolved

-

-

-

510

-

-

-

440

470

520

480

490

310

350

360

360

440

460

450

430

440

470

450

360

350

Copper, 

dissolved

110

110

100

100

110

110

110

100

110

100

110

110

80

90

80

100

110

120

120

130

110

110

110

110

100

Iron, 

dissolved 

(H9/L)

240,000

250,000

230,000

230,000

230,000

250,000

230,000

260,000

250,000

220,000

190,000

230,000

190,000

170,000

180,000

200,000

220,000

260,000

260,000

290,000

250,000

250,000

260,000

240,000

250,000

TABLE 3 65
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 17, 472330111082801--CENTERVILLE WETLANDS INFLOW AT CENTERVILLE, MT-Continued

Date

Jul 1994

20...

Aug 

16...

Sep 

06...

Oct

13...

Nov

14...

Dec

15...

Jan 1995

11...

Feb

22...

Mar

15...

Apr 

12...

May 

16...

Jun

12...

Jul

12...

Aug 

16...

Sep 

13...

Oct

10...

Nov

27...

Jan 1996

10...

Feb

20...

Apr 

02...

May

07...

Jun

03...

Jul

01...

Aug 

06...

Sep

03...

Lead, 

dissolved

<10

<10

<10

<10

<10

<10

<10

2

3

2

<!

4

3

2

2

2

1

1

3

1

3

2

2

4

3

Lithium, 

dissolved

340

340

340

320

370

320

350

350

340

430

590

550

310

340

270

300

320

310

300

350

320

380

290

310

290

Manganese, 

dissolved

1,400

1,400

1,400

1,400

1,500

1,300

1,400

1,500

1,500

1,900

2,200

2,000

1,200

1,200

1,100

1,200

1,300

1,300

1,300

1,500

1,400

1,600

1,400

1,200

1,200

£££ N|cke|. d^vid -jay- (ng/L) <MO/L)

<10 820

<10 810

<10 790

<10 750

<10 790

<10 780

<10 810

<1 760

<1 800

<1 850

<1 950

<1 870

<1 650

<1 650

<1 640

<1 630

<1 740

<1 810

<1 810

<1 930

<1 800

<1 790

<1 800

<1 680

1 770

Selenium, 

dissolved

<5

<5

<2

<2

2

2

2

2

2

2

2

1

-

_

_

-

-

-

-

_

_

-

-

_

Silver, 

dissolved

<3

3

<3

<3

<3

<3

<3

<3

<3

<3

<3

<4

<3

<2

<2

<3

<3

<3

<5

<3

<3

<5

<5

<5

<5

Strontium, 

dissolved

900

930

900

880

890

850

940

940

910

1,000

1,100

1,100

810

840

760

810

860

860

820

910

820

890

880

810

830

Vanadium, 

dissolved 

(H9/L)

47

71

56

53

59

57

51

12

17

11

<18

<24

<18

<12

13

<18

<18

<18

35

<18

20

30

<30

<30

<30

Zinc, 

dissolved 

(MQflL)

2,400

2,400

2,300

2,300

2,400

2,300

2,200

2,300

2,400

2,300

2,500

2,500

1,900

1,800

1,700

2,000

2,100

2,300

2,300

2,500

2,300

2,400

2,300

2,100

2,000

66 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 18, 472331111083001--CENTERVILLE WETLANDS OUTFLOW AT CENTERVILLE, MT

Date

Jul 1994

20...

Aug

16...

Sep

06...

Oct

13...

Nov

14...

Jan 1995

11...

Feb

22...

Mar

15...

Apr

12...

May

16...

Jun

12...

Jul

12...

Aug

16...

Sep

13...

Oct

10...

Nov

27...

Jan 1996

10...

Feb

20...

Apr

02...

May

07...

Jun

03...

Jul

01...

Aug

06...

Sep

03...

Time

1605

1745

1345

1500

1535

1230

1100

1715

1240

1435

1700

1000

0915

1510

1610

1100

1000

1100

1645

0810

1500

1400

1400

1220

Streamflow, instantaneous 

(ffrs)

0.004

.002

-

.01

.01

.02

.005

.01

.02

-

-

.01

.02

.02

.02

--

-

-

.01

.01

.008

--

--

Specific conductance, 

onsite 

(US/cm)

4,530

4,600

4,360

3,650

3,400

3,590

2,390

2,820

2,710

3,430

3,380

3,320

3,680

3,420

3,360

3,330

3,320

1,760

3,400

3,720

3,620

4,070

5,080

5,370

Temperature, 

air <°C)

29.0

28.0

29.5

14.0

6.0

7.0

11.5

10.5

15.0

18.0

28.0

17.0

19.0

25.0

17.0

-7.5

4.0

9.0

11.0

2.0

25.0

30.0

22.0

20.0

Temperature, 

water <°C)

20.0

22.0

15.0

8.5

1.5

0.5

1.5

7.0

8.0

20.0

22.5

14.0

15.0

17.0

11.0

0.0

0.0

0.0

4.0

7.5

20.5

27.5

22.0

18.0

pH, 

onsite (standard 

units)

3.1

3.1

2.8

2.7

2.8

4.3

3.3

2.9

2.7

2.5

2.7

2.7

2.8

2.9

2.7

2.6

2.6

2.9

2.6

2.6

2.6

2.5

2.4

2.5

Hardness, 

total 

(mo/Las 

CaC03)

2,100

2,200

1,800

1,300

1,100

1,600

980

870

680

1,100

1,000

930

1,300

1,000

910

910

810

370

830

1,100

970

1,400

1,900

1,900

Calcium, dissolved 

(mg/L)

550

550

470

320

280

380

280

230

170

280

260

230

320

260

220

220

190

90

200

280

230

340

460

480

Magnesium, dissolved 

(mg/L)

180

190

160

110

97

150

69

71

61

96

92

87

110

96

88

87

82

34

80

99

95

130

170

180

Sodium, dissolved 

(mg/L)

37

45

35

23

20

41

16

16

12

18

17

18

24

21

19

18

18

7.0

17

19

19

24

35

39

Sodium adsorption 

ratio

0.4

.4

.4

.3

.3

.5

.2

.2

.2

.2

.2

.3

.3

.3

.3

.3

.3

.2

.3

.2

.3

.3

.4

.4

TABLE 3 67
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 18, 472331111083001--CENTERVILLE WETLANDS OUTFLOW AT CENTERVILLE, MT--Continued

Date

Jul 1994

20...

Aug

16...

Sep

06...

Oct

13...

Nov

14...

Jan 1995

11...

Feb

22...

Mar

15...

Apr

12...

May

16...

Jun

12...

Jul

12...

Aug

16...

Sep

13...

Oct

10...

Nov

27...

Jan 1996

10...

Feb

20...

Apr

02...

May

07...

Jun

03...

Jul

01...

Aug

06...

Sep

03...

Potassium, 

dissolved 

(mg/L)

140

120

99

45

36

140

46

37

13

36

22

27

36

25

17

13

21

4.2

7.2

13

9.9

22

34

30

Acidity 

(mg/L as

24

28

37

32

32

23

14

27

24

30

32

29

31

31

32

35

39

16

39

42

38

44

55

52

Alkalinity, Su|fate 

fmnii .. dissolved (Sfiff < " «

e<l 3,600

e<l 3,700

e<l 3,900

e<l 3,100

e<l 2,900

e<l 2,800

e<l 2,600

e<l 3,300

e<l 3,500

e<l 3,000

e<l 3,000

e<l 2,600

e<l 3,100

e<l 2,800

e<l 2,600

e<l 2,800

e<l 2,800

e<l 1,100

e<l 2,900

e<l 3,200

e<l 3,100

e<l 3,500

e<l 4,600

e<l 4,600

Chloride, 

dissolved 

(mg/L)

40

42

36

16

12

44

17

26

21

20

8.9

11

20

10

9.3

6.2

9.9

2.4

5.8

8.9

7.9

12

22

25

Fluoride, 

dissolved 

(mg/L)

<1

<1

<1

1.4

1.2

1.2

<1

<1

1.2

1.4

<1

<1

<1

1.3

1.0

<1

-

<1

1.0

1.1

<1

<1

1.5

<1

Silica, 

dissolved 

(mg/L as 

SlOJ

65

56

48

64

73

70

38

51

49

70

60

46

34

42

61

65

72

28

70

75

65

63

26

-

Solids, 

sum of constituents, 

dissolved 

(mg/L)

e4,840

e4,960

e5,120

e4,000

e3,760

e3,900

e3,220

e3,950

e4,070

e3,810

e3,770

e3,330

e3,960

e3,560

e3,320

e3,580

e3,650

el, 440

e3,720

e4,120

e3,940

e4,550

e5,870

e5,860

Solids, 

dissolved 

(ton/ 

acre-ft)

e6.59

e6.74

e6.96

e5.44

e5.ll

e5.30

e4.38

5.37

e5.54

e5.18

e5.12

e4.52

e5.38

e4.84

e4.52

e4.87

e4.96

el.95

e5.06

e5.61

e5.35

e6.19

e7.99

e7.97

Solids, 

dissolved 

(ton/d)

eO.05

e.03

-

e.15

e.12

e.23

e.05

e.12

--

e.20

-

-

e.13

e.16

e.14

e.16

-

-

-

e.ll

e.ll

e.Ol

-

--

68 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 18, 472331111083001--CENTERVILLE WETLANDS OUTFLOW AT CENTERVILLE, MT-Continued

Date

Jul 1994

20...

Aug

16...

Sep

06...

Oct

13...

Nov

14...

Jan 1995

11...

Feb

22...

Mar

15...

Apr

12...

May

16...

Jun

12...

Jul

12...

Aug

16...

Sep

13...

Oct

10...

Nov

27...

Jan 1996

10...

Feb

20...

Apr

02...

May

07...

Jun

03...

Jul

01...

Aug

06...

Sep

03...

Aluminum, 

dissolved

170,000

180,000

260,000

210,000

200,000

150,000

94,000

140,000

140,000

180,000

180,000

170,000

220,000

230,000

200,000

200,000

230,000

84,000

220,000

230,000

210,000

240,000

270,000

280,000

Arsenic, Barium, 

dissolved dissolved 

(ug/L) (ug/L)

<1 35

<1 32

<1 15

<1 11

<1 7

<1 39

<1 16

<1 14

<1 4

<5 15

<1 4

3 <3

<1 9

<1 9

<1 10

<1 7

<2 9

<1 3

<1 6

<1 8

<1 8

2 8

<1 8

<2 <8

Beryllium, 

dissolved

30

32

38

32

27

23

13

19

19

28

29

25

32

28

27

27

26

11

29

32

31

37

34

44

Boron, 

dissolved (ng/L)

360

410

350

220

200

210

110

140

130

180

180

190

230

230

190

190

180

60

180

210

140

130

250

210

Cadmium, 

dissolved 

(ug/L)

-

~

~

-

19

-

12

19

17

21

20

17

18

19

30

26

25

14

26

28

27

28

26

24

Chromium, 

dissolved

<20

<20

20

<20

20

<20

<20

<20

<20

20

<20

<20

<20

20

20

<20

<20

8

20

30

36

<40

30

<40

Cobalt, 

dissolved

480

640

540

440

610

590

190

310

260

340

370

370

400

390

360

380

340

190

400

460

420

520

550

570

Copper, 

dissolved 

(ug/L)

<30

<30

60

100

110

50

40

70

70

90

80

40

40

50

130

110

110

40

110

120

110

70

70

<80

Iron, 

dissolved 

(ug/L)

51,000

63,000

100,000

100,000

130,000

110,000

50,000

73,000

98,000

100,000

120,000

130,000

86,000

64,000

100,000

160,000

220,000

83,000

210,000

190,000

190,000

210,000

240,000

220,000

TABLE 3 69
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 18, 472331111083001--CENTERVILLE WETLANDS OUTFLOW AT CENTERVILLE, MT--Continued

Date

Jul 1994

20...

Aug

16...

Sep

06...

Oct

13...

Nov

14...

Jan 1995

11...

Feb

22...

Mar

15...

Apr

12...

May

16...

Jun

12...

Jul

12...

Aug

16...

Sep

13...

Oct

10...

Nov

27...

Jan 1996

10...

Feb

20...

Apr

02...

May

07...

Jun

03...

Jul

01...

Aug

06...

Sep

OSLead, Lithium, 

dissolved dissolved

<10 550

<10 590

<10 530

<10 370

<10 380

<10 430

<1 220

<1 260

<1 250

1 400

<1 450

<1 350

<1 440

<1 370

<1 330

<1 340

<1 310

<1 120

<1 320

<1 390

<1 380

<1 410

<1 640

<4 650

Manganese, 

dissolved

6,000

6,100

4,800

3,200

3,000

5,300

3,200

2,000

1,600

2,600

2,300

2,100

2,500

2,000

1,800

2,100

1,700

740

1,700

2,500

2,200

3,500

4,700

4,900

Molyb- NiCkei

-j-fc. ... mwiioi

d£sTed -J3JJ-

<10 680

<10 710

<10 870

<10 690

<10 730

<10 650

<1 360

1 480

<1 490

1 730

<1 650

<1 600

<1 650

<1 620

<1 650

<1 700

<1 740

<1 300

<1 800

<1 870

<1 850

<1 930

<2 1,000

<1 930

Selenium, Silver, 

dissolved dissolved 

(ng/L) (ng/L)

<1 <3

<5 <3

<1 <3

<2 <3

<1 <3

<2 <3

<1 <3

<1 <3

1 <3

<2 <3

<2 <4

<3

<3

<3

<3

<3

<3

2

<2

<3

<8

<8

<8

<8

Strontium, 

dissolved

2,100

2,200

1,900

1,200

1,100

1,900

1,100

890

730

1,100

1,100

980

1,300

1,100

960

1,000

950

390

920

1,100

1,000

1,400

1,800

2,000

Vanadium, 

dissolved (ng/L)

<18

24

19

<18

30

<18

<18

8

<18

<18

<24

<18

<18

<18

<18

<18

<18

<6

<12

<18

<48

<48

<48

<48

Zinc, 

dissolved

820

840

1,600

2,000

2,400

1,700

970

1,400

1,300

1,700

1,700

1,500

1,600

1,500

2,100

2,100

2,500

880

2,200

2,300

2,100

2,300

2,300

2,100

70 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Couiee Coal 

Area, Montana
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 19, 472334111104401--MOUNT OREGON MINE DRAIN TO KATE'S COULEE AT SAND COULEE, MT

Date

Jul 1994

20...

Aug

17...

Sep

07...

Oct

13...

Nov

15...

Dec

15...

Jan 1995

11...

Feb

21...

Mar

15...

Apr

12...

May

16...

Jun

13...

Jul

12...

Aug

16...

Sep

13...

Oct

11...

Nov

28...

Jan 1996

11...

Feb

22...

Apr

03...

May

07...

Jun

04...

Jul

02...

Aug

07...

Sep

03...

Time

1350

1115

0710

1250

0810

1320

1645

1330

1550

1410

1135

1435

0800

1440

0800

1530

1100

0900

0800

1400

0940

1710

0945

0810

1530

Streamflow, instantaneous 

(ftVs)

0.08

.03

.08

.02

.02

.05

.07

.06

.04

.18

.10

.11

.09

.08

.05

.09

.07

.07

.07

.06

.07

.10

.08

.04

.07

Specific conductance, 

onsite 

(uS/cm)

2,920

3,010

2,940

2,880

2,900

2,790

2,780

2,870

2,870

2,860

2,860

2,950

2,970

2,890

2,880

2,850

2,770

2,750

2,700

2,690

2,700

2,730

2,740

2,720

2,770

Temperature, 

air (°C)

25.0

27.0

13.0

12.0

2.0

3.5

5.0

17.5

14.0

16.0

11.5

22.0

16.0

22.0

8.0

17.0

-1.0

5.0

1.0

4.0

4.0

25.0

20.0

17.0

23.0

Temperature, 

water (°C)

12.0

12.0

11.0

11.0

11.5

12.0

12.0

11.5

10.0

11.5

15.0

11.0

11.0

11.5

11.0

10.0

11.0

11.0

11.0

11.0

11.0

11.0

11.5

11.5

11.0

PH, 

onsite (standard 

units)

4.0

4.1

4.0

4.7

4.1

4.2

4.2

4.1

4.2

4.1

4.0

4.0

4.2

4.1

4.1

4.2

4.3

4.3

4.3

4.2

4.3

4.1

4.0

4.0

4.2

Hardness, 

total 

(mg/Las 

CaC03)

960

960

960

960

960

920

940

900

900

920

920

960

960

960

940

940

940

960

940

900

920

940

960

900

960

Calcium, dissolved 

(mg/L)

170

170

170

170

170

170

160

160

160

170

170

170

170

170

160

160

160

170

160

160

170

160

170

160

170

Magnesium, dissolved 

(mg/L)

130

130

130

130

130

120

130

120

120

120

120

130

130

130

130

130

130

130

130

120

120

130

130

120

130

Sodium, dissolved 

(mg/L)

24

24

24

23

24

23

24

24

24

25

23

25

25

24

25

23

24

24

24

24

24

24

25

22

24

Sodium adsorption 

ratio

0.3

.3

.3

.3

.3

.3

.3

.3

.3

.4

.3

.4

.4

.3

.4

.3

.3

.3

.3

.3

.3

.3

.4

.3

.3

TABLE 3 71
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 19, 472334111104401--MOUNT OREGON MINE DRAIN TO KATE'S COULEE AT SAND COULEE, MT--Continued

Date

Jul 1994

20...

Aug

17...

Sep

07...

Oct

13...

Nov

15...

Dec

15...

Jan 1995

11...

Feb

21...

Mar

15...

Apr

12...

May

16...

Jun

13...

Jul

12...

Aug

16...

Sep

13...

Oct

11...

Nov

28...

Jan 1996

11...

Feb

22...

Apr

03...

May

07...

Jun

04...

Jul

02...

Aug

07...

Sep

03...

Potassium, 

dissolved 

(mo/L)

4.7

5.2

4.9

4.7

4.3

4.8

4.6

4.8

4.1

4.7

4.5

4.8

4.5

~

4.8

4.5

4.2

4.6

4.4

4.1

4.4

4.4

5.1

4.8

4.6

Acidity

31

33

32

31

32

31

28

29

29

30

28

31

32

30

29

32

30

29

28

30

27

27

29

29

27

Alkalinity, Su|fate> 

/mrlfl i «« dissolved 

C$X>5 (lt|9/L>

e<l 2,500

e<l 2,700

e<l 2,900

e<l 2,900

e<l 2,700

e<l 2,500

e<l 2,400

e<l 3,300

e<l 3,700

e<l 3,100

e<l 2,800

e<l 3,500

e<l 2,700

e<l 2,800

e<l 2,500

e<l 2,400

e<l 2,400

e<l 2,500

e<l 2,300

e<l 2,400

e<i 2,500

e<l 3,100

e<l 2,300

e<l 2,200

e<l 2,500

Chloride, 

dissolved 

(mo/L)

4.4

4.3

8.3

8.5

4.6

3.7

3.0

9.4

6.3

17

10

4.4

3.5

10

4.0

3.5

3.7

8.0

4.0

4.5

11

4.2

3.3

5.0

6.4

Fluoride, 

dissolved 

(mo/L)

<l

<l

<1

2.3

1.8

1.5

2.4

2.3

2.3

2.2

3.4

2.7

<1

1.4

2.5

1.7

1.4

-

2.1

2.4

2.1

1.7

<1

2.5

2.5

Silica, 

dissolved 

(mo/Las

S1O2)

40

39

37

39

37

36

34

35

35

36

37

39

41

40

39

38

37

40

38

37

38

35

40

36

37

Solids, 

sum of constituents, 

dissolved 

(mo/L)

e3,390

e3,580

e3,780

e3,760

e3,550

e3,300

e3,170

e4,120

e4,500

e3,940

e3,620

e4390

e3,600

e3,670

e3370

e3,220

e3,240

e3,380

e3,110

e3,200

e3310

e3,920

e3,160

e2,990

e3330

Solids, 

dissolved 

(ton/ 

acre-tt)

e4.61

e4.87

e5.14

e5.ll

e4.83

e4.49

e4.31

e5.60

e6.12

e5.35

e4.92

e5.97

e4.89

e4.99

e4.58

e4.38

e4.41

e4.60

e4.24

e4.36

e4.50

e5.34

e4.29

e4.06

e4.53

Solids, 

dissolved 

(ton/d)

eO.73

e.29

e.82

6.16

6.18

e.45

e.60

e.63

e.49

el.91

e.98

1.30

e.87

e.79

e.49

e.79

e.61

e.62

e.62

e.52

e.63

el. 03

e.64

e.29

e.63

72 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 19, 472334111104401--MOUNT OREGON MINE DRAIN TO KATE'S COULEE AT SAND COULEE, MT--Continued

Date

Jul 1994

20...

Aug

17...

Sep

07...

Oct

13...

Nov

15...

Dec

15...

Jan 1995

11...

Feb

21...

Mar

15...

Apr

12...

May

16...

Jun

13...

Jul

12...

Aug

16...

Sep

13...

Oct

11...

Nov

28...

Jan 1996

11...

Feb

22...

Apr

03...

May

07...

Jun

04...

Jul

02...

Aug

07...

Sep

03...

Aluminum, 

dissolved 

(H9/L)

170,000

170,000

180,000

170,000

170,000

150,000

170,000

170,000

160,000

170,000

160,000

170,000

170,000

160,000

180,000

160,000

180,000

180,000

160,000

160,000

150,000

141,000

160,000

150,000

150,000

Arsenic, 

dissolved 

(H9/L)

12

14

15

16

12

13

18

12

13

13

12

16

12

20

7

14

11

22

19

24

16

22

14

9

6

Barium, 

dissolved 

(H9/L)

12

14

13

14

12

13

13

13

14

14

27

15

14

14

15

27

27

28

14

27

27

26

15

26

28

Beryllium, 

dissolved

27

26

25

25

25

24

24

24

23

25

25

26

24

26

25

25

23

24

25

24

24

35

28

23

24

Boron,

260

270

310

240

270

310

280

240

240

260

260

250

260

270

270

270

260

250

240

260

300

-

-

-

Cadmium, 

dissolved 

(H9/L)

-

-

-

~

~

~

~

8

8

8

9

6

9

9

9

9

8

8

8

7

7

7

8

8

8

Chromium, 

dissolved 

(H9/L)

40

30

30

30

50

30

20

20

30

20

40

30

30

40

40

40

20

30

30

30

30

50

40

30

40

Cobalt, 

dissolved 

(H9/L)

-

-

-

-

-

-

-

740

700

710

610

510

730

680

730

650

670

580

600

510

650

670

650

660

670

Copper, 

dissolved 

(H9/L)

<40

<30

<30

<30

<50

<30

<30

<30

<30

<30

<30

<40

<40

<40

<30

<30

<30

<30

<50

<30

<30

<60

<60

<40

<40

Iron, 

dissolved 

(H9/L)

330,000

330,000

310,000

300,000

300,000

280,000

230,000

280,000

280,000

280,000

280,000

330,000

340,000

320,000

310,000

290,000

290,000

310,000

280,000

280,000

280,000

280,000

310,000

280,000

290,000

TABLE 3 73
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 19, 472334111104401-MOUNT OREGON MINE DRAIN TO KATE'S COULEE AT SAND COULEE, MT--Continued

Date

Jul 1994

20...

Aug

17...

Sep

07...

Oct

13...

Nov

15...

Dec

15...

Jan 1995

11...

Feb

21...

Mar

15...

Apr

12...

May

16...

Jun

13...

Jul

12...

Aug

16...

Sep

13...

Oct

11...

Nov

28...

Jan 1996

11...

Feb

22...

Apr

03...

May

07...

Jun

04...

Jul

02...

Aug

07...

Sep

03...

Lead, Lithium, 

dissolved dissolved 

(ug/L) (ug/L)

<10 380

<10 440

<10 440

<10 430

<10 470

<10 420

<10 440

<1 430

<1 440

<1 450

<1 430

2 420

2 400

<1 410

<1 410

1 410

<1 430

<1 420

<1 400

2 420

2 420

<1 380

1 390

<1 390

<2 390

Manganese, 

dissolved (ug/L)

1,200

1,300

1,300

1,300

1,300

1,200

1,200

1,200

1,200

1,200

1,200

1,200

1,300

1,300

1,300

1,200

1,200

1,300

1,200

1,200

1,200

1,200

1,300

1,200

1,200

Molybdenum, 

dissolved 

(ug/L)

<30

<30

<30

<30

<30

<30

<30

10

12

12

12

9

10

11

11

10

10

10

10

12

12

9

12

10

11

Nickel, 

dissolved 

(ug/L)

1,600

1,600

1,500

1,600

1,600

1,600

1,500

1,400

1,500

1,500

1,600

1,600

1,500

1,600

1,500

1,500

1,500

1,600

1,500

1,500

1,500

1,700

1,600

1,400

1,500

5f,le; Silver, distoived -jar- (ug/L) <«'/L>

<2 4

<5 <3

<2 <3

<2 <3

<2 <5

<1 <3

<1 <3

<1 <3

<1 <3

<1 <3

<1 <3

<2 <4

<4

<4

<3

<3

<3

<3

<5

<3

_ 5

<4

10

<4

8

Strontium, 

dissolved 

(ug/L)

1,200

1,300

1,200

1,200

1,100

1,100

1,200

1,100

1,100

1,200

1,200

1,200

1,200

1,200

1,200

1,200

1,200

1,200

1,100

1,200

1,200

1,200

1,300

1,100

1,200

Vanadium, 

dissolved 

(ug/L)

130

160

150

140

150

130

140

92

93

86

97

93

89

100

94

94

88

86

95

86

100

48

100

<24

84

Zinc, 

dissolved 

(ug/L)

6,500

6,400

6,100

6,200

6,300

5,900

5,600

5,700

5,500

5,700

6,100

6,500

6,300

6,100

6,000

6,000

5,900

6,600

6,100

5,900

6,000

5,900

6,500

5,800

6,400

74 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water In the Sand Coulee Coal 

Area, Montana
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 20, 472346111102401--NELSON MINE DRAIN TO SAND COULEE AT SAND COULEE, MT

Date

Jul 1994

20...

Aug

17...

Sep

07...

Oct

13...

Nov

14...

Dec

15...

Jan 1995

11...

Feb

21...

Mar

15...

Apr

12...

May

16...

Jun

13...

Jul

11...

Aug

16...

Sep

13...

Oct

11...

Nov

28...

Jan 1996

11...

Feb

22...

Apr

03...

May

07...

Jun

04...

Jul

02...

Aug

06...

Sep

03...

Time

1250

1045

0735

1105

1640

1340

1500

1310

1625

1315

1205

1420

1750

1420

0910

1700

1030

0940

0930

1415

1000

1730

1000

1730

1545

Streamflow, instantaneous 

(ft3/s)

0.03

.03

.03

.03

.02

.02

.02

.01

.01

.009

.01

.06

.08

.06

.05

.04

.03

.03

.02

.02

.01

.01

.02

.02

.02

Specific conductance, 

onsite 

(US/cm)

8,090

8,020

8,060

8,140

8,120

7,600

7,620

8,610

8,310

8,010

7,470

8,110

8,980

8,520

8,430

7,970

7,360

7,240

6,970

6,840

7,670

7,430

6,810

7,290

7,230

Temperature, 

air <°C)

26.5

24.0

14.0

7.5

3.0

4.0

6.5

18.0

11.0

16.0

16.0

23.5

16.0

22.0

11.0

14.0

-0.5

5.0

1.0

4.0

4.5

25.0

21.5

23.0

23.0

Temperature, 

water (°C)

17.0

15.0

12.0

10.0

8.0

5.5

8.0

8.0

8.0

11.5

14.5

15.0

11.5

15.0

11.5

11.5

8.5

6.0

6.5

12.0

9.0

16.5

15.0

17.0

17.5

pH, 

onsite (standard 

units)

2.7

2.6

2.3

3.0

2.6

2.6

2.6

2.6

2.7

2.6

2.5

2.6

2.8

2.7

2.6

2.6

2.5

2.6

2.5

2.4

2.6

2.6

2.6

2.4

2.6

Hardness, 

total 

(mg/L as 

CaCO3)

1,600

1,600

1,600

1,600

1,600

1,500

1,600

1,800

1,700

1,700

1,500

1,600

1,700

1,700

1,400

1,500

1,400

1,500

1,500

1,500

1,700

1,700

1,400

1,500

1,600

Calcium, dissolved 

(mg/L)

260

250

240

260

240

240

250

280

270

270

250

270

280

270

190

240

220

240

240

240

270

260

220

230

250

Magnesium, dissolved 

(mg/L)

230

230

240

230

250

230

230

270

250

240

220

230

240

250

230

220

210

210

220

210

240

250

210

220

230

Sodium, dissolved 

(mg/L)

20

20

20

19

20

20

16

19

20

20

19

20

21

21

24

20

20

19

21

21

19

20

23

21

21

Sodium adsorption 

ratio

0.2

.2

.2

.2

.2

.2

.2

.2

.2

.2

.2

.2

.2

.2

.3

.2

.2

.2

.2

.2

.2

.2

.3

.2

.2

TABLE 3 75
Table 3. Water-quality data for sites 

SITE 20, 472346111102401-

in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

-NELSON MINE DRAIN TO SAND COULEE AT SAND COULEE, MT--Continued

Date

Jul 1994

20...

Aug

17...

Sep

07...

Oct

13...

Nov

14...

Dec

15...

Jan 1995

11...

Feb

21...

Mar

15...

Apr

12...

May

16...

Jun

13...

Jul

11...

Aug

16...

Sep

13...

Oct

11...

Nov

28...

Jan 1996

11...

Feb

22...

Apr

03...

May

07...

Jun

04...

Jul

02...

Aug,

06...

Sep,

03...

Potassium, 

dissolved 

(mg/L)

1.4

1.5

2.0

.6

.7

.9

.9

1.1

.7

.8

.9

.6

.6

.8

.4

.6

.5

.3

.4

.5

.7

.5

.5

.7

.8

Acidity 

(mg/L as

170

170

170

170

170

170

170

190

180

170

160

180

200

190

180

170

160

160

150

140

170

160

150

160

150

Alkalinity, Su|fate 

/mn/i oo dissolved 

Sftff <"^>

e<l 10,000

e<l

e<l 11,000

e<l 11,000

e<l 10,000

e<l 10,000

e<l 11,000

e<l 13,000

e<l 13,000

e<l 14,000

e<l 12,000

e<l 11,000

e<l 13,000

e<l 13,000

e<l 11,000

e<l 10,000

e<l 9,600

e<l 9,100

e<l 11,000

e<l 9,500

e<l 11,000

e<l 11,000

e<l 9,000

e<l 8,900

e<l 8,900

5X3& £»-

(mg/L) ("j(o 

<1 87

<1 84

<1 88

1.4 140

100

75

7.3 59

4.5 140

5.4 140

4.5 140

5.7 140

<1 140

<1 140

140

130

<1 130

140

140

4.4 140

1.6 150

2.4 140

<1 140

3.4 140

3.5 150

Solids, 

sum of constituents, 

dissolved 

(mg/L)

el 3,200

el 4,200

e!4,100

el 3,000

el 3,000

el 4,000

el 6,500

el 6,300

el 7,200

el 5,000

el 4,300

el 6,700

el 6,500

el 4,400

el 3,000

el 2,400

el 1,900

el 3,700

el 2,200

el 4,000

e!4,100

el 1,600

el 1,700

el 1,800

Solids, 

dissolved 

(ton/ 

acre-ft)

e!7.9

e!9.4

e!9.2

e!7.7

e!7.7

e!9.0

e22.4

e22.2

e23.3

e20.4

e!9.5

e22.7

e22.5

e!9.6

e!7.7

el 6.8

el 6.2

e!8.6

e!6.7

e!9.1

e!9.2

e!5.8

e!5.9

e!6.1

Solids, 

dissolved 

(ton/d)

el. 14

el.O

el.07

e8.1

e.74

e.68

e.53

e.43

e.42

e.44

e2.12

3.60

2.86

el.87

el.33

el.OO

e.87

e.78

e.56

e.53

e.42

e.47

e.57

e.48

76 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 20, 47234611102401--NELSON MINE DRAIN TO SAND COULEE AT SAND COULEE, MT-Continued

Date

Jul 1994

20...

Aug

17...

Sep

07...

Oct

13...

Nov

14...

Dec

15...

Jan 1995

11...

Feb

21...

Mar

15...

Apr

12...

May

16...

Jun

13...

Jul

11...

Aug

16...

Sep

13...

Oct

11...

Nov

28...

Jan 1996

11...

Feb

22...

Apr

03...

May

07...

Jun

04...

Jul

02...

Aug

06...

Sep

03...

Aluminum, 

dissolved 

(H9/L)

910,000

910,000

910,000

930,000

890,000

860,000

920,000

1,000,000

970,000

940,000

870,000

1,000,000

1,000,000

870,000

960,000

850,000

830,000

880,000

740,000

790,000

910,000

880,000

765,000

800,000

820,000

Arsenic, 

dissolved 

(H9/L)

75

19

67

38

16

~

63

76

75

74

51

45

27

65

65

73

60

50

48

29

46

51

51

65

51

Barium, 

dissolved 

(H9/L)

<100

<100

<100

<20

<100

<100

<100

<10

<10

<10

40

<20

<20

<25

<100

35

37

38

<20

37

41

41

38

38

44

Beryllium, 

dissolved <ng/L)

60

70

60

110

80

70

80

140

120

120

110

110

120

130

40

99

83

91

98

95

100

100

95

110

100

Boron, 

dissolved fog/L)

750

800

850

730

830

900

830

790

770

770

710

810

840

1,000

860

780

620

660

630

660

820

~

-

~

-

Cadmium, 

dissolved

fog/D

100

110

110

-

110

100

110

120

120

110

96

110

100

110

110

110

100

97

84

87

110

120

110

110

110

Chromium, 

dissolved 

(H9/L)

310

290

350

320

400

370

320

320

310

320

330

330

280

400

360

280

300

330

390

290

300

300

270

280

380

Cobalt, 

dissolved (ng/L)

2,200

2,000

2,100

5,600

1,700

1,900

2,200

2,200

2,200

1,900

1,700

2,700

2,000

2,200

2,400

2,000

2,100

3,900

5,200

4,900

2,400

2,200

2,000

2,000

1,900

Copper, 

dissolved

fog/D

310

300

310

380

290

290

300

430

370

330

260

310

230

410

430

450

390

390

400

380

330

480

650

340

460

Iron, 

dissolved 

(H9/L)

1,600,000

1,600,000

1,700,000

1,490,000

1,500,000

1,500,000

1,400,000

1,600,000

1,600,000

1,500,000

1,400,000

1,600,000

1,900,000

1,900,000

2,000,000

1,500,000

1,300,000

1,300,000

1,300,000

1,300,000

1,400,000

1,400,000

1,200,000

1,300,000

1,400,000

TABLE 3 77
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 20, 472346111102401--NELSON MINE DRAIN TO SAND COULEE AT SAND COULEE, MT--Continued

Date

Jul 1994

20...

Aug

17...

Sep

07...

Oct

13...

Nov

14...

Dec

15...

Jan 1995

11...

Feb

21...

Mar

15...

Apr

12...

May

16...

Jun

13...

Jul

11...

Aug

16...

Sep

13...

Oct

11...

Nov

28...

Jan 1996

11...

Feb

22...

Apr

03...

May

07...

Jun

04...

Jul

02...

Aug

06...

Sep

03...

Lead, Lithium, 

dissolved dissolved 

(uo/L) (ug/L)

1.0 900

<1 910

<1 970

<10 930

<1 930

<1 1,000

<1 940

<1 ' 1,400

<1 1,100

<1 1,100

<1 1,000

<1 1,000

<1 1,100

<1 1,000

<1 1,400

<1 950

<1 920

<1 900

<1 880

<1 910

<1 1,100

<1 990

<1 890

<1 970

<4 990

Manganese, 

dissolved

7,800

7,700

7,100

8,700

8,000

7,100

8,500

11,000

9,900

9,400

8,200

8,800

12,000

11,000

8,200

8,200

7,900

8,000

8,000

8,300

10,000

9,600

7,600

7,500

7,800

Molybdenum, 

dissolved 

(ug/L)

<5

<i

i

<10

<1

4

3

5

6

<2

5

<4

3

2

4

4

4

1

4

3

3

4

<1

4

5

Nickel, 

dissolved 

(M9/L)

4,900

5,000

4,700

4,400

4,600

4,300

5,100

5,500

5,200

4,800

4,700

5,000

5,000

5,100

4,900

4,400

4^00

4,500

4,700

4,400

5,100

5,000

4,400

4,300

4,800

Selenium, Silver, 

dissolved dissolved 

(uo/L) (ng/L)

<25 <1

<10 <1

<10 <1

<5 <20

<5 <1

<2 <1

<5 <1

<2 <10

<2 <10

<2 <10

<2 <20

<5 <20

<20

<25

<20

~ <10

<10

<20

<20

~ <12

<25

<25

<25

<20

_

Strontium, 

dissolved

1,500

1,600

1,600

1,500

1,600

1,500

1,600

1,600

1,600

1,600

1,600

1,600

1,700

1,800

1,800

1,600

1,500

1,500

1,400

1,500

1,400

1,500

1,500

1,500

1,500

Vanadium, 

dissolved

-

-

660

-

--

-

420

360

330

410

430

520

650

420

340

320

380

290

350

<150

<150

<120

360

Zinc, 

dissolved 

(ug/L)

16,000

18,000

19,000

18,000

19,000

18,000

19,000

19,000

19,000

18,000

17,000

19,000

19,000

18,000

18,000

16,000

15,000

16,000

17,000

16,000

18,000

18,000

17,000

16,000

18,000

78 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water In the Sand Coulee Coal 

Area, Montana
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 21, 472309110551201--LEWIS COULEE BELOW MINE ADIT, AT BELT, MT

Date

Jul 1994

19...

Aug

17...

Sep

06...

Oct

14...

Nov

14...

Dec

15...

Jan 1995

12...

Feb

22...

Mar

16...

Apr

12...

May

17...

Jun

13...

Jul

13...

Aug

17...

Sep

14...

Oct

12...

Nov

29...

Jan 1996

12...

Feb

21...

Apr

04...

May

07...

Jun

05...

Jul

03...

Aug

08...

Sep

04

Time

1405

1430

1120

1020

1200

1615

1040

0850

1015

1820

0900

1030

1010

1015

1140

0930

1100

0910

0945

1230

1520

1330

0950

1145

0940

Streamflow, instantaneous 

(ft5/*)

0.004

.004

.005

.006

.004

.004

.004

.004

.004

.23

.26

.09

.30

.02

.008

.008

.007

.006

 .007

.006

.008

.007

.007

.005

.005

Specific conductance, 

onsite 

(uS/cm)

3,390

3,510

3,460

3,450

3,510

3,430

3,380

3,360

3,330

818

874

1,040

1,330

2,270

3,610

3,650

3,750

3,660

3,810

3,670

3,660

3,550

3,670

3,750

3,780

Temperature, 

air <°C)

23.0

30.0

23.0

7.0

5.5

-.5

6.0

7.0

9.0

10.0

18.0

22.5

17.0

18.0

24.0

5.0

9.0

9.0

8.0

9.0

13.0

20.0

25.0

23.0

10.0

Temperature, 

water (°C)

22.0

24.0

15.5

7.5

.5

1.0

3.0

4.0

6.0

8.5

9.5

15.0

14.0

14.5

14.5

8.0

6.5

4.0

3.5

11.5

18.0

21.0

20.5

21.0

12.0

PH, 

onsite (standard 

units)

3.1

3.0

3.1

3.2

3.3

3.3

3.2

3.2

3.1

7.1

7.2

6.8

7.4

4.2

3.2

3.2

3.2

3.6

3.5

3.6

3.2

3.0

3.0

3.1

3.2

Hardness, 

total 

(mg/L as 

CaCO3)

930

900

900

950

1,000

930

1,000

1,000

970

370

410

500

600

740

1,000

950

990

1,000

1,000

1,000

990

950

900

920

990

Calcium, dissolved 

(mg/L)

190

180

180

180

200

190

200

200

190

58

62

76

100

130

200

180

180

200

200

200

180

180

180

170

180

Magnesium, dissolved 

(mg/L)

110

110

110

120

120

110

120

120

120

54

62

75

85

100

120

120

130

130

130

130

130

120

110

120

130

Sodium, dissolved 

(mg/L)

26

26

26

27

26

24

26

26

26

19

19

26

60

25

24

23

23

22

22

23

23

24

21

22

22

Sodium adsorption 

ratio

0.4

.4

.4

.4

.4

.3

.4

.4

.4

.4

.4

.5

1

.4

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

TABLE 3 79
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 21, 472309110551201-LEWIS COULEE BELOW MINE ADIT, AT BELT, MT--Continued

Date

Jul 1994

19...

Aug

17...

Sep

06...

Oct

14...

Nov

14...

Dec

15...

Jan 1995

12...

Feb

22...

Mar

16...

Apr

12...

May

17...

Jun

13...

Jul

13...

Aug

17...

Sep

14...

Oct

12...

Nov

29...

Jan 1996

12...

Feb

21...

Apr

04...

May

07...

Jun

05...

Jul

03...

Aug

08...

Sep

04...

Potassium, 

dissolved 

(mg/L)

6.3

6.2

5.9

5.6

5.2

5.9

5.7

6.0

5.7

5.0

4.4

5.0

7.7

6.2

5.9

5.5

5.2

5.8

5.8

5.5

6.2

6.0

6.2

6.2

5.8

Acidity 

(mo/Las

41

45

43

43

42

46

42

37

15

<.l

<.l

.5

.3

19

45

49

53

52

52

49

48

48

47

55

50

Alkalinity, Su|fate 

/»WT/I « dissolved (a&? <««

e<l 3,000

e<l 3,000

e<l 3,200

e<l 3,200

e<l 2,700

e<l 3,200

e<l 3,000

e<l 3,500

e<l 3,300

197 200

246 180

179 340

265 470

e<l 2,100

e<l 3,200

e<l 3,700

e<l 3,800

e<l 3,600

e<l 4,000

e<l 4,000

e<l 4,000

e<l 3,900

e<l 3,400

e<l 3,500

e<l 3,600

Chloride, 

dissolved 

(mg/L)

11

11

15

10

8.9

9.1

8.6

11

10

12

14

17

17

16

7.8

7.4

7.2

11

7.9

10

9.8

9.9

8.0

9.4

11

Cli i/trMa SillCa, dis^iv* 'I?*0/**

/_>_/i \ imu/L as (mg/L) » gfo^

<l 70

<1 70

<1 68

<l 70

67

<1 66

<1 65

2.2 65

1.8 62

<1 9.0

<1 7.9

<1 9.6

<1 11

42

75

1.1 72

<1 70

76

<1 75

1.7 71

1.6 70

<1 66

<1 69

2.1 71

2.1 75

Solids, 

sum of constituents, 

dissolved 

(mg/L)

e4,030

e4,050

e4,280

e4,310

e3,800

64,230

e4,020

e4,510

e4,300

485

504

671

914

e2,770

e4,360

e4,850

e4,970

e4,870

e5,290

e5,240

e5,120

e4,990

e4,460

e4,650

e4,850

Solids, 

dissolved 

(ton/ 

acre-ft)

e5.48

e5.50

e5.82

e5.85

65.17

e5.75

e5.46

e6.13

e5.84

.66

.68

.91

1.24

e3.76

e5.94

e6.60

e6.76

66.62

e7.20

e7.13

e6.97

e6.79

e6.06

e6.33

e6.59

Solids, 

dissolved 

(ton/d)

eO.04

e.04

e.06

e.07

e.04

e.05

e.04

e.04

e.04

.30

.35

.16

.74

e.13

e.09

e.10

e.09

e.08

e.10

e.08

e.ll

e.09

e.08

e.06

e.06

80 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water In the Sand Coulee Coal 

Area, Montana
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 21, 472309110551201-LEWIS COULEE BELOW MINE ADIT, AT BELT, MT«Continued

Date

Jul 1994

19...

Aug

17...

Sep

06...

Oct

14...

Nov

14...

Dec

15...

Jan 1995

12...

Feb

22...

Mar

16...

Apr

12...

May

17...

Jun

13...

Jul

13...

Aug

17...

Sep

14...

Oct

12...

Nov

29...

Jan 1996

12...

Feb

21...

Apr

04...

May

07...

Jun

05...

Jul

03...

Aug

08...

Sep

04...

Aluminum, 

dissolved 

(HSJ/L)

220,000

220,000

230,000

230,000

210,000

230,000

200,000

200,000

200,000

30

40

20

20

110,000

250,000

240,000

260,000

280,000

280,000

260,000

250,000

230,000

220,000

250,000

260,000

Arsenic, Barium, 

dissolved dissolved 

(H9/L) (ng/L)

<1 15

<1 12

<1 11

<1 10

<1 23

<1 10

<1 11

<1 12

<1 10

<1 70

<1 75

<1 77

<1 130

<1 44

<5 9

<5 19

<1 20

<2 22

<2 21

<1 22

<1 19

<1 21

<1 21

2 20

<1 19

Beryllium, 

dissolved 

(H9/L)

21

19

19

16

19

18

19

17

17

<.5

<.5

<.5

<.5

11

21

23

20

21

25

21

24

20

20

32

24

Boron, 

dissolved 

(M9/D

230

270

290

280

260

290

230

220

220

50

40

60

100

200

250

260

270

270

250

250

270

-

--

-

270

Cadmium, 

dissolved 

(H9/L)

<4

-

8

5

<3

9

8

10

<1

<1

<1

<1

9

21

17

17

17

15

14

16

15

17

16

15

Chromium, 

dissolved (ng/L)

30

40

40

<30

40

30

40

30

30

<5

<5

<5

<5

30

50

50

50

60

50

50

40

<30

<30

<50

50

Cobalt, 

dissolved (ng/L)

2,000

1,900

940

1,600

1,000

3,300

1,100

710

660

20

20

50

20

370

770

750

760

700

660

630

800

710

730

800

770

Copper, 

dissolved 

(H9/L)

50

40

<30

<50

<50

<30

<40

<40

<40

<10

<10

<10

<10

30

80

60

60

<50

<50

<50

<50

<100

<100

<100

<80

Iron, 

dissolved 

(H9/L)

380,000

410,000

430,000

450,000

450,000

380,000

380,000

370,000

370,000

8,400

5,500

13,000

2,200

230,000

470,000

490,000

480,000

530,000

560,000

530,000

440,000

440,000

470,000

490,000

550,000

TABLE 3 81
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 21, 472309110551201--LEWIS COULEE BELOW MINE ADIT AT BELT, MT--Continued

Date

Jul 1994

19...

Aug

17...

Sep

06...

Oct

14...

Nov

14...

Dec

15...

Jan 1995

12...

Feb

22...

Mar

16...

Apr

12...

May

17...

Jun

13...

Jul

13...

Aug

17...

Sep

14...

Oct

12...

Nov

29...

Jan 1996

12...

Feb

21...

Apr

04...

May

07...

Jun

05...

Jul

03...

Aug

08...

Sep

04...

Lead, 

dissolved 

(ng/L)

<10

<10

<10

<10

<10

<10

<10

2

2

<1

<1

<1

<1

<1

2

2

<1

1

2

1

2

2

2

2

2

Lithium, 

dissolved

390

430

410

480

440

380

400

400

400

47

54

82

120

240

390

420

430

410

440

420

440

420

440

460

450

Manganese, 

dissolved

1,700

1,600

1,500

1,500

1,900

1,700

2,100

1,900

1,600

68

56

160

85

1,000

1,500

1,500

1,500

1,600

1,500

1,600

1,400

1,400

1,400

1,300

1,500

d&d nln'nm Nickei. a-*-

<10 1,300

<10 1,300

<10 1,300

<10 1,300

<10 1,400

<10 1,300

<10 1,300

<1 1,300

<1 1,200

2 20

2 30

1 60

<1 20

<1 760

<1 1,500

<1 1,400

<1 1,500

<1 1,600

<1 1,600

<1 1,500

1 1,400

<1 1,400

<1 1,400

<1 1,400

<1 1,600

Selenium, Silver, 

dissolved dissolved 

(jig/L) (ug/L)

<5 <4

<5 3

<1 <3

<1 <5

<2 <5

<1 <3

<1 <4

<1 4

<1 <3

2 1

2 <1

2 <1

<1

<3

<5

<10

<5

6

<5

<5

<5

<6

<6

18

<8

Strontium, 

dissolved

1,200

1,200

1,200

1,200

1,200

1,100

1,300

1,300

1,200

400

470

590

980

950

1,200

1,300

1,300

1,300

1,400

1,400

1,400

1,300

1,300

1,300

1,300

Vanadium, 

dissolved

82

110

100

71

84

67

82

64

68

<6

<6

<6

<6

<18

<30

95

<30

62

59

61

30

42

<36

<60

<48

Zinc, 

dissolved 

(H9/L)

4,600

4,400

4,400

4,400

4,700

4,500

4,400

4,200

4,200

55

46

110

32

2,300

5,000

4,800

5,000

5,400

5,600

5,000

4,800

4,500

4,500

4,800

5,300

82 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued)

SITE 22, 472446111085101--PIPE SPRING AT TRACY, MT

Date

Jul 1994

20...

Aug

16...

Sep

07...

Oct

14...

Nov

15...

Dec

15...

Jan 1995

11...

Feb

22...

Mar

15...

Apr

12...

May

17...

Jun

12...

Jul

12...

Aug

16...

Sep

13...

Oct

10...

Nov

28...

Jan 1996

11...

Feb

20...

Apr

03...

May

07...

Jun

04...

Jul

02...

Aug

07...

Sep

03...

Time

1105

1640

0955

0800

0855

1415

1610

1155

1310

0900

1255

1335

0900

1100

1600

1000

1530

1045

1500

0845

1100

0830

1030

0910

1630

Streamflow, instantaneous 

(fT/s)

0.06

.05

.05

.05

.04

.04

.04

.04

.04

.03

.10

.61

.34

.18

.11

.09

.08

.06

.06

.05

.05

.05

.05

.05

.05

Specific conductance, 

onsite 

(uS/cm)

1,680

1,620

1,610

1,670

1,720

1,710

1,700

1,730

1,710

1,750

1,770

2,360

1,880

1,660

1,550

1,520

1,470

1,450

1,480

1,430

1,430

1,440

1,420

1,410

1,440

Temperature, 

air (°C)

24.0

26.0

21.0

5.0

4.0

2.5

5.5

13.0

13.0

.5

20.0

25.0

17.0

19.0

22.0

10.0

-4.0

6.5

10.0

0.0

2.5

18.0

22.0

18.0

23.0

Temperature, 

water (°C)

10.5

11.0

10.5

11.0

11.5

11.0

11.0

10.5

10.5

10.5

10.5

11.0

11.0

11.0

11.0

10.5

10.5

10.5

10.5

10.5

8.5

11.0

10.5

11.0

10.5

PH, 

onsite (standard 

units)

2.9

3.0

2.7

2.9

2.9

2.8

2.8

2.8

2.9

2.8

2.7

2.4

2.8

2.9

3.0

2.9

2.9

2.9

2.9

2.9

3.0

3.0

3.1

3.1

3.1

Hardness, 

total 

(mg/Las 

CaC03)

480

460

480

480

490

480

500

480

490

510

510

540

460

430

410

420

420

430

420

430

420

440

450

430

460

Calcium, dissolved 

(mg/L)

81

76

78

79

83

83

84

80

83

86

88

91

73

67

63

65

65

69

67

69

72

72

71

67

73

Magnesium, dissolved 

(mg/L)

68

66

69

68

68

67

71

68

69

72

71

76

68

64

62

63

63

62

60

62

57

64

65

63

68

Sodium, dissolved 

(mg/L)

22

22

22

21

22

22

22

23

23

22

22

25

25

24

23

23

24

21

23

23

19

23

21

21

23

Sodium adsorption 

ratio

0.4

.4

.4

.4

.4

.4

.4

.5

.5

.4

.4

.5

.5

.5

.5

.5

.5

.4

.5

.5

.4

.5

.4

.4

.5

TABLE 3 83
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued)

SITE 22, 472446111085101-PIPE SPRING ATTRACY, MT--Continued

Date

Jul 1994

20...

Aug

16...

Sep

07...

Oct

14...

Nov

15...

Dec

15...

Jan 1995

11...

Feb

22...

Mar

15...

Apr

12...

May

17...

Jun

12...

Jul

12...

Aug

16...

Sep

13...

Oct

10...

Nov

28...

Jan 1996

11...

Feb

20...

Apr

03...

May

07...

Jun

04...

Jui

02...

Aug

07...

Sep

03...

Potassium, 

dissolved 

(mg/L)

2.6

2.7

2.5

2.5

2.5

2.5

2.4

2.6

2.6

2.6

2.5

1.7

2.1

4.9

2.2

2.2

2.2

2.4

2.3

2.3

2.6

2.5

2.7

2.8

2.5

Acidity 

Onj/L..

6.4

6.3

6.2

6.1

-

6.5

6.4

6.3

6.6

6.3

7.6

13

7.6

5.8

5.3

5.2

4.4

4.5

4.5

4.4

4.4

4.4

4.2

4.5

5.0

Alkalinity, Su|fate 

i-JSi .. dissolved

Sfcff < » «

e<l 790

e<l 810

e<l 890

e<l 910

e<l 830

e<l 830

e<l 860

e<l 970

e<l 950

e<l 950

e<l 1,000

e<l 1,300

e<l 1,000

e<l 910

e<l 800

e<l 700

e<l 720

e<l 710

e<l 640

e<l 720

e<l 710

e<l 670

e<l 780

e<l 670

e<l 650

Chloride, 

dissolved 

(mg/L)

5.6

5.6

5.4

5.6

5.6

5.6

5.7

5.9

8.0

8.1

7.2

5.9

6.6

7.9

6.3

6.3

5.8

5.5

6.2

7.1

6.5

5.8

5.6

6.2

6.0

Fluoride, 

dissolved 

(mg/L)

0.9

.8

.6

2.0

2.0

.6

2.1

1.6

1.7

1.7

1.6

1.8

2.0

1.2

1.0

1.2

.8

.5

2.5

.6

.6

.7

.8

.6

.9

Silica, 

dissolved 

(mg/L as sTo2)

49

47

47

50

49

51

51

50

51

54

54

54

42

39

38

39

38

41

41

43

41

44

45

41

44

Solids, 

sum of constituents, 

dissolved 

(mg/L)

el, 070

el, 080

el, 160

el, 180

el, 110

el, 110

el, 150

el, 240

el ,230

el,240

el, 300

el, 670

el, 270

el, 160

el, 030

e933

e949

e944

e875

e957

e938

e911

el, 020

e901

e898

Solids, 

dissolved 

(ton/ 

acre-ft)

el. 45

el. 46

el. 58

el.61

el.51

el.51

el. 56

el. 69

el. 68

el. 69

el.77

e2.27

el. 73

el. 58

el. 40

el. 27

el. 29

el. 28

el. 19

el. 30

el. 28

el. 24

el.39

el. 23

el. 22

Solids, 

dissolved 

(ton/d)

e0.17

e.16

e.16

e.15

e.13

e.12

e.12

e.12

e.ll

e.ll

e.35

e2.75

el. 17

e.56

e.31

e.23

e.19

e.17

e.13

e.14

e.13

e.12

e.15

e.13

e.12

84 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water In the Sand Coulee Coal 

Area, Montana
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 22, 472446111085101-PIPE SPRING AT TRACY, MT-Continued

Date

Jul 1994

20...

Aug

16...

Sep

07...

Oct

14...

Nov

15...

Dec

15...

Jan 1995

11...

Feb

22...

Mar

15...

Apr

12...

May

17...

Jun

12...

Jul

12...

Aug

16...

Sep

13...

Oct

10...

Nov

28...

Jan 1996

11...

Feb

20...

Apr

03...

May

07...

Jun

04...

Jul

02...

Aug

07...

Sep

03...

Aluminum, 

dissolved 

(ug/L)

36,000

36,000

36,000

35,000

36,000

36,000

37,000

34,000

36,000

36,000

41,000

67,000

38,000

31,000

28,000

25,000

23,000

25,000

26,000

23,000

23,000

22,000

22,000

23,000

24,000

Arsenic, Barium, 

dissolved dissolved 

(ug/L) (ug/L)

<1 3

<1 3

<1 3

<1 3

<1 3

<1 3

<1 4

<5 4

<1 4

<1 4

<1 7

<1 <3

<1 <2

<1 2

<1 2

<1 5

<1 5

1 6

<1 5

<1 6

<1 5

<1 4

<1 4

<1 6

<1 6

Beryllium, 

dissolved

7

5

7

7

7

7

7

7

7

7

8

12

7

6

5

5

4

5

5

5

4

5

5

5

5

Boron, 

dissolved 

(ug/L)

170

170

160

170

160

160

170

160

170

170

180

180

140

130

150

150

140

150

150

150

160

150

150

140

150

Cadmium, 

dissolved 

(ug/L)

<10

<10

<10

<10

<10

<10

<10

8

8

9

9

16

12

10

10

9

8

7

7

7

7

7

8

7

7

Chromium, 

dissolved 

(ug/L)

<5

<5

<5

<5

<5

<5

5

<5

<5

<5

7

<20

<5

<5

<5

<5

<5

<5

<5

<5

<5

<5

<5

<5

<5

Cobalt, 

dissolved 

(ug/L)

200

170

190

200

190

200

210

210

210

220

220

320

220

180

190

160

150

190

150

150

150

170

170

150

150

Copper, 

dissolved

20

10

10

20

10

10

20

<10

10

20

20

60

20

20

20

10

10

10

<10

10

<10

10

10

10

10

Iron, 

dissolved 

(ug/L)

6,600

6,300

6,200

5,900

6,100

6,000

6,000

5,900

6,000

6,400

8,000

39,000

12,000

6,400

5,000

4,700

4,200

4,000

3,700

3,700

3,400

3,800

3,500

3,500

3,700

TABLE 3 85
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued)

SITE 22,472446111085101-PIPE SPRING AT TRACY, MT-Continued

Date

Jul 1994

20...

Aug

16...

Sep

07...

Oct

14...

Nov

15...

Dec

15...

Jan 1995

11...

Feb

22...

Mar

15...

Apr

12...

May

17...

Jun

12...

Jul

12...

Aug

16...

Sep

13...

Oct

10...

Nov

28...

Jan 1996

11...

Feb

20...

Apr

03...

May

07...

Jun

04...

Jul

02...

Aug

07...

Sep

03...

Lead, Lithium, 

dissolved dissolved

<10 140

<10 140

<10 140

<10 140

<10 150

<10 150

<10 150

<1 160

<1 160

1 160

<1 160

<1 160

<1 130

<1 120

<! 110

<1 120

<1 120

<1 110

<1 120

<1 130

1 110

2 130

<1 120

<1 130

<1 130

Manganese, 

dissolved 

(ug/L)

600

590

600

580

630

610

630

600

620

650

660

930

650

570

530

520

500

510

500

500

480

500

500

480

520

EgjT Nickel, oenum, HI«O«IUOH dissolved "^Tf41 (H9/L) < ««

<10 360

<10 350

<10 360

<10 360

<10 380

<10 380

<10 400

<1 360

<1 370

<1 400

<1 450

<1 600

<1 380

<1 330

<2 290

<1 310

<1 280

<1 290

<1 290

<1 280

2 280

<1 290

<l 290

<1 280

<1 300

Sete- sifr-r Stronnium, rttelVrfJLi tium, dissolved "^ dissolved

<1 2 610

<5 <1 610

<! 2 610

<2 <1 600

1 <1 610

1 <1 620

<2 <1 670

1 <1 650

1 <1 660

1 <1 670

<1 <1 680

<1 <3 670

<1 540

<1 530

<1 500

2 510

<1 540

<1 530

<! 550

<1 550

<1 490

<1 550

<1 580

<1 550

1 580

Vanadium, 

dissolved

(M9/L)

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<18

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

Zinc, 

dissolved

1,200

1,100

1,100

1,100

1,200

1,100

1,200

1,100

1,100

1,200

1,300

1,900

1,200

1,000

890

930

840

910

850

820

860

860

880

810

920

86 Water-Quality Date (July 1904 through September 1006) and Statistical Summaries of Data tor Surface Water In the Sand Coulee Coal 

Araai Montana
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued)

SITE 23, 472447111085301-STOCK TANK SPRING AT TRACY, MT

Date

Jul 1994

20...

Aug 

16...

Sep 

07...

Oct

14...

Nov

15...

Dec

15...

Jan 1995

11...

Feb

22...

Mar

15...

Apr 

12...

May

17...

Jun

12...

Jul

12...

Aug 

16...

Sep 

13...

Oct

10...

Nov

28...

Jan 1996

11...

Feb

20...

Apr 

03...

May 

07...

Jun

04...

Jul

02...

Aug

07...

Sep 

03...

Time

1055

1630

0945

0750

0910

1405

1620

1145

1305

0850

1250

1325

0830

1045

1550

0940

1520

1030

1450

0830

1050

0820

1020

0900

1615

Streamflow, instantaneous 

(frVs)

-

-

0.002

.002

.002

.002

.002

.002

.002

.002

.003

.003

.002

.002

.002

.002

.002

.002

.002

.002

.002

.002

_

Specific conductance, 

onsite 

(uS/cm)

782

788

782

785

798

780

781

777

785

848

820

967

938

883

836

824

761

736

755

740

742

756

769

764

791

Temperature, 

air <°C)

24.0

26.0

21.0

5.0

4.5

2.5

5.5

13.0

13.0

0.0

20.0

25.0

16.0

19.0

22.0

10.0

-4.0

6.0

10.0

0.0

6.0

18.0

22.0

18.0

23.0

Temperature, 

water <°C)

13.0

16.0

12.0

9.5

7.0

4.5

4.0

5.0

5.5

5.0

10.5

12.0

10.5

11.5

12.5

9.0

6.0

4.5

6.0

4.0

6.5

9.5

12.5

11.0

13.5

pH, 

onsite (standard 

units)

7.3

7.8

7.2

7.3

7.3

7.5

7.2

7.5

7.5

7.2

7.1

7.1

7.3

7.4

7.4

7.4

7.4

7.5

7.6

7.4

7.4

7.3

7.5

7.2

7.3

Hardness, 

total 

(mg/Las 

CaC03)

400

390

400

400

410

400

400

390

380

430

420

500

500

440

430

410

390

380

390

380

370

390

390

350

390

Calcium, dissolved 

(mg/L)

63

61

62

64

68

65

64

63

61

73

68

83

84

72

68

66

61

58

61

61

59

63

60

56

62

Magnesium, dissolved 

(mg/L)

59

58

59

59

59

58

59

57

55

61

60

72

70

64

62

60

57

56

57

55

55

57

57

52

57

Sodium, dissolved 

(mg/L)

14

15

15

14

15

14

14

14

14

15

15

17

16

15

16

15

15

15

14

14

15

15

14

13

14

Sodium adsorption 

ratio

0.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

TABLE 3 87
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 23, 472447111085301-STOCK TANK SPRING AT TRACY, MT--Continued

Date

Jul 1994

20...

Aug 

16...

Sep 

07...

Oct

14...

Nov

15...

Dec

15...

Jan 1995

11...

Feb

22...

Mar

15...

Apr 

12...

May 

17...

Jun

12...

Jul

12...

Aug 

16...

Sep 

13...

Oct

10...

Nov

28...

Jan 1996

11...

Feb

20...

Apr 

03...

May 

07...

Jun

04...

Jul

02...

Aug

07...

Sep 

03...

Potassium, 

dissolved 

(mg/L)

2.1

2.1

2.0

2.0

2.1

2.0

1.9

1.8

2.0

2.4

2.1

2.3

2.7

2.3

2.4

2.5

_

1.9

1.9

2.0

2.0

2.0

1.8

2.3

2.7

Acidity 

(mg/L as In

0.3

.2

.2

.1

.1

.2

.3

<.l

<.l

<.l

<.l

.1

.1

.2

<.l

<.l

.4

.3

<.l

.2

<.l

.2

<.l

<.l

Alkalinity, 

lab 

(mg/L as 

CaC03)

230

229

233

237

233

227

225

226

227

235

231

217

216

222

226

227

-

222

225

224

228

234

235

239

236

Sulfate, 

dissolved 

(mg/L)

170

170

170

190

180

170

170

140

140

170

190

290

300

240

210

200

_

160

160

160

160

160

150

150

160

Chloride, 

dissolved 

(mg/L)

5.7

5.9

5.7

6.4

6.4

6.1

6.5

5.6

5.5

6.1

6.4

5.7

5.4

5.8

5.8

6.0

-

5.3

5.9

5.9

5.9

5.5

4.9

5.7

6.3

Fluoride, 

dissolved 

(mg/L)

0.8

1.0

.8

.9

1.2

1.0

1.1

.8

.9

.9

1.0

.4

.8

1.0

1.0

1.0

-

1.1

.5

1.2

1.1

1.1

1.1

1.1

1.0

Silica, 

dissolved 

(mg/L as 

SiOa)

10

9.6

10

11

11

10

10

10

9.6

11

10

11

13

12

12

12

11

11

11

11

11

11

11

9.7

11

Solids, 

sum of constituents, 

dissolved 

(mg/L)

463

461

465

490

483

463

462

428

425

481

492

612

622

546

513

499

-

442

447

445

446

456

441

434

456

Solids, 

dissolved 

(ton/ 

acre-ft)

0.63

.63

.63

.67

.66

.63

.63

.58

.58

.65

.67

.83

.85

.74

.70

.68

--

.60

.61

.61

.61

.62

.60

.59

.62

Solids, 

dissolved 

(ton/d)

-

-

<.01

<.0l

<.01

<.01

<.01

<.01

<.01

<01

<.01

<01

<.0l

<.01

-

<.01

<01

<.01

<.01

<.01

<.01

<.01

<01

88 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 23, 472447111085301--STOCK TANK SPRING AT TRACY, MT--Continued

Date

Jul 1994

20...

Aug 

16...

Sep 

07...

Oct

14...

Nov

15...

Dec

15...

Jan 1995

11...

Feb

22...

Mar

15...

Apr 

12...

May 

17...

Jun

12...

Jul

12...

Aug 

16...

Sep 

13...

Oct

10...

Nov

28...

Jan 1996

11...

Feb

20...

Apr 

03...

May 

07...

Jun

04...

Jul

02...

Aug 

07...

Sep 

03...

silflm" Arsenic, Barium, 

disSJed dlssolved dissolved

\*i00wi »^** I uQ/L) ( LlCvL)

<10 <1 51

<10 <1 51

<10 <1 51

<10 <1 48

<10 <1 48

<10 <1 46

10 <1 48

<10 <1 46

<10 <1 44

<10 <1 48

<10 <1 48

40 <1 56

<10 <1 50

<10 <1 49

10 <1 49

20 <1 46

<10 - 44

<10 <2 43

10 <1 42

<10 <1 41

<10 <1 45

6 <1 45

<5 <1 47

<5 <1 46

10 <1 51

Beryllium, 

dissolved

<0.5

<5

<5

<.5

<.5

<.5

<.5

<.5

<.5

<5

<.5

<.5

<5

<5

<5

<.5

<5

<.5

<.5

<5

<5

<5

<.5

<.5

<. 5

CadBoron, .».!. ... riieanluari mtUm, (uSt) diss°lved

90 <1

80 <1

80 <1

70 <1

70 2

80 <1

70 <1

60 <1

70 <1

60 <1

80 <1

70

80 <1

100 4.0

90 <1

70 <1

_.

60 <1

80 <1

50 <1

70 <1

70 <1

80 <1

70 1

80 2

Chromium, 

dissolved

<5

<5

<5

<5

<5

<5

<5

<5

<5

<5

<5

<5

<5

<5

<5

<5

<5

<5

<5

<5

<5

<5

<5

<5

<5

Cobalt, Copper, 

dissolved dissolved 

Gig/L) (n9/L)

<3 <10

<3 <10

<3 <10

<3 <10

<3 <10

<3 <10

<3 <10

<1 <10

<1 <10

<1 <10

<3 <10

- <10

<3 <10

<3 <10

<3 <10

<3 <10

<10

<3 <10

<3 <10

<3 <10

<3 <10

<3 <10

<3 <10

<3 <10

<3 <10

Iron, 

dissolved

23

28

6

<3

<3

<3

7

3

<3

3

<3

4

8

4

9

<3

<3

<3

7

6

<3

<3

<3

<3

10

TABLE 3 89
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 23, 472447111085301-STOCK TANK SPRING AT TRACY, MT-Continued

Date

Jul 1994

20...

Aug

16...

Sep

07...

Oct

14...

Nov

15...

Dec

15...

Jan 1995

11...

Feb

22...

Mar

15...

Apr

12...

May

17...

Jun

12...

Jul

12...

Aug

16...

Sep

13...

Oct

10...

Nov

28...

Jan 1996

11...

Feb

20...

Apr

OSMay

07...

Jun

04...

Jul

02...

Aug

07...

Sep

03...

Lead, 

dissolved

<10

10

<10

<10

11

<10

<10

<1

<1

<1

<10

-

<10

<10

<10

<10

-

<10

<10

10

10

20

<10

30

10

Lithium, 

dissolved

33

35

37

33

34

35

36

33

32

35

38

39

37

36

37

37

37

35

34

33

34

37

36

33

34

"S2T" S£ Nlctel' S± Sl|ver. nese, oenum, ««««»»I»»AH mum, ,«««»»I»»IH dissolved dissolved dl}Jj5?d dissolved dl?"S'fd 

(ng/L) (ng/L) "^ ' (ng/L) ing"-j

1 <10 <10 2 <1

1 <10 <10 <5 <1

<1 <10 <10 3 <1

<1 <10 <10 2 <1

<1 <10 10 2 <1

1 20 <10 2 <1

<1 <10 <10 2 <1

<1 2 <10 3 <1

<1 2 <10 2 <1

4 2 <10 3 1

<1 10 10 3 <1

<1 <10 3 <1

3 <10 <10 <1

<1 20 <10 <1

3 <10 <10 <1

2 <10 10 - <1

<1 <10 <1

<1 20 10 - <1

<1 <10 <10 - <1

<1 <10 20 <1

<1 <10 <10 - <1

<1 <10 <10 <1

<1 10 <10 - 2

<1 <10 <10 <1

5 <10 <10 - 1

Strontium, 

dissolved (ng/L)

510

520

520

500

500

490

520

490

470

520

530

660

600

570

540

510

500

490

460

460

510

490

510

480

510

Vanadium, 

dissolved (ng/L)

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

Zinc, 

dissolved (ng/L)

7

12

7

9

14

11

9

10

7

11

14

19

17

15

18

25

10

13

15

10

13

14

9

13

9

90 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 24, 472513111082501--JOHNSON BADWATER MINE SMALL WETLANDS INFLOW NEAR TRACY, MT

Date

Jul 1994

20...

Aug

16...

Sep

07...

Oct

13...

Nov

15...

Dec

16...

Jan 1995

12...

Feb

22...

Mar

15...

Apr

12...

May

17...

Jun

12...

Jul

11...

Aug

15...

Sep

12...

Oct

10...

Nov

27...

Jan 1996

11...

Feb

21...

Apr

03...

May

06...

Jun

04...

Jul

02...

Aug

07...

Sep

03...

Time

0730

1425

0845

1755

1010

0830

0805

1345

1145

0755

1635

1230

1200

1740

1645

1050

1350

1420

1310

0730

1630

0715

1430

1000

1220

Streamflow, instantaneous 

(ffVe)

0.01

.007

.01

.008

.01

.01

.01

.01

.01

.01

.01

.01

.01

.01

.01

.009

.01

.01

.01

.01

.01

.01

.009

.009

.009

Specific conductance, 

onsite 

(uS/cm)

2,270

2,290

2,240

2,260

2,300

2,270

2,210

2,260

2,230

2,250

2,260

2,180

2,110

2,140

2,120

2,120

2,110

2,110

2,160

2,100

2,150

2,120

2,180

2,100

2,100

Temperature, 

air <°C)

15.0

33.0

17.0

9.5

9.0

4.5

1.0

12.0

13.0

-.5

27.0

24.0

18.0

22.0

25.0

10.0

-2.0

7.5

12.0

-1.0

16.0

17.0

30.0

20.0

18.0

Temperature, 

water <°C)

11.0

11.0

11.5

10.5

10.0

9.0

9.5

9.0

8.0

9.0

10.0

10.0

10.5

11.0

11.0

10.0

9.5

9.0

8.5

8.5

9.5

10.0

10.5

11.0

11.0

pH, 

onslte (standard 

units)

3.8

3.9

3.7

3.9

3.7

4.0

3.8

3.7

3.9

3.8

3.6

3.5

3.8

3.8

3.8

3.8

3.8

3.8

3.8

3.8

3.8

3.8

3.9

3.7

3.8

Hardness, 

total 

(mg/Las 

CaC03)

960

960

1,000

990

990

990

1,000

960

960

990

960

920

900

900

850

870

940

920

940

920

900

900

940

870

940

Calcium, dissolved 

(mg/L)

170

170

170

180

180

180

180

170

170

180

170

170

160

160

140

150

160

170

160

170

160

160

160

150

160

Magnesium, dissolved 

(mg/L)

130

130

140

130

130

130

140

130

130

130

130

120

120

120

120

120

130

120

130

120

120

120

130

120

130

Sodium, dissolved 

<mg/L)

24

26

25

24

25

24

25

24

25

25

24

25

24

24

23

24

24

22

25

25

24

23

25

24

24

Sodium adsorption 

ratio

0.3

.4

.3

.3

.3

.3

.3

.3

.4

.3

.3

.4

.3

.3

.3

.4

.3

.3

.4

.4

.3

.3

.4

.4

.3

TABLE 3 01
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 24, 472513111082501-JOHNSON BADWATER MINE SMALL WETLANDS INFLOW NEAR TRACY, MT--Continued

Date

Jul 1994

20...

Aug

16...

Sep

07...

Oct

13...

Nov

15...

Dec

16...

Jan 1995

12...

Feb

22...

Mar

15...

Apr

12...

May

17...

Jun

12...

Jul

11...

Aug

15...

Sep

12...

Oct

10...

Nov

27...

Jan 1996

11...

Feb

21...

Apr

03...

May

06...

Jun

04...

Jul

02...

Aug

07...

Sep

03...

Potassium, 

dissolved 

(mg/L)

7.5

7.0

7.5

7.1

7.4

7.5

6.8

7.4

7.4

7.0

7.0

6.9

7.2

7.5

6.0

6.9

6.4

7.1

6.6

6.8

6.8

6.7

7.4

7.4

7.1

Acidity

12

13

13

11

12

12

14

11

11

11

12

11

11

11

10

12

12

12

11

11

11

11

11

12

9.7

Alkalinity, Su|fate 

fmn/i a« dissolved (c$£o$ o^)

e<l 1,500

e<l 1,600

e<l 1,700

e<l 2,000

e<l 1,800

e<l 1,600

e<l 1,700

e<l 1,600

e<l 2,000

e<l 1,800

e<l 1,700

e<l 1,900

e<l 1,600

e<l 1,600

e<l 1,400

e<l 1,500

e<l 1,600

e<l 1,700

e<l 1,400

e<l 1,500

e<l 1,600

e<l 1,400

e<l 1,500

e<l 1,500

e<l 1,400

Chloride, 

dissolved 

(mg/L)

6.1

5.9

6.2

6.6

6.8

6.3

5.6

6.2

8.1

8.9

9.2

6.0

6.4

8.3

6.0

5.4

5.5

9.8

6.1

7.6

8.2

6.3

5.8

7.2

8.5

Fluoride, 

dissolved 

(mg/L)

7.4

5.1

6.6

7.0

6.3

4.6

6.8

6.1

5.6

6.2

5.6

5.7

3.2

5.8

5.9

5.4

7.4

5.4

8.3

6.7

6.3

7.0

5.6

6.4

6.4

Silica, 

dissolved

SK>2)

49

48

48

51

48

49

49

49

47

49

49

48

50

50

47

48

47

50

51

50

49

49

52

47

49

Solids, 

sum of constituents, 

dissolved 

(mg/L)

e2,090

e2,190

e2,300

e2,590

62,400

e2,190

62,310

e2,180

e2,580

e2,390

62,270

e2,470

e2,150

e2,150

el,920

e2,040

e2,160

e2,270

el,970

e2,060

e2,150

el, 950

e2,070

e2,040

el, 960

Solids, 

dissolved 

(ton/ 

acre-ft)

e2.85

e2.98

e3.!3

e3.53

e3.27

e2.99

e3.14

e2.97

e3.51

e3.26

e3.09

e3.36

e2.92

e2.93

e2.61

e2.77

e2.94

e3.09

e2.68

e2.81

e2.92

e2.65

e2.82

e2.77

e2.67

Solids, 

dissolved 

(ton/d)

eO.06

e.04

e.07

e.06

e.06

e.07

e.06

e.06

e.07

e.06

e.07

e.07

e.06

e.06

e.05

e.05

e.06

e.06

e.05

e.06

e.06

e.05

e.05

e.05

e.05

92 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 24, 472513111082501--JOHNSON BADWATER MINE SMALL WETLANDS INFLOW NEAR TRACY, MT-Continued

Date

Jul 1994

20...

Aug

16...

Sep

07...

Oct

13...

Nov

15...

Dec

16...

Jan 1995

12...

Feb

22...

Mar

15...

Apr

12...

May

17...

Jun

12...

Jul

11...

Aug

15...

Sep

12...

Oct

10...

Nov

27...

Jan 1996

11...

Feb

21...

Apr

03...

May

06...

Jun

04...

Jul

02...

Aug

07...

Sep

04...

Alum- Arsenic IMIBM. Mrwnic, di,^;* -asr1 <ug/L) b<M

57,000 <1

55,000 <1

55,000 <1

55,000 <1

54,000 <1

56,000 <1

54,000 <1

52,000 <1

51,000 <1

50,000 <1

50,000 <1

52,000 1

48,000 <1

49,000 <1

52,000 <1

49,000 <1

51,000 <1

57,000 <2

56,000 <1

49,000 <1

46,000 <1

48,000 <1

50,000 <1

48,000 <1

48,000 <1

Barium, 

dissolved (ug/L)

9

9

9

9

8

9

9

9

8

9

15

8

8

9

8

15

14

15

10

15

14

14

9

15

15

Beryllium, 

dissolved 

(M9/L)

27

19

25

26

25

25

27

24

24

24

25

26

23

25

23

23

23

23

26

24

23

23

26

24

24

Boron, 

dissolved (ug/L)

280

320

310

320

300

320

300

270

280

290

290

260

270

270

290

290

280

280

270

300

300

250

230

250

200

Cadmium, 

dissolved 

(H9/L)

<3

-

-

<3

-

<3

--

3

3

3

2

2

3

2

2

2

2

2

2

2

2

2

2

2

2

Chromium, 

dissolved 

(M9/L)

<20

<20

<20

<20

<20

<20

<20

<20

<20

<20

<20

<20

<20

<10

<10

20

<20

<20

<10

<10

<20

<20

<20

<10

<10

Cobalt, 

dissolved <ng/L)

-

-

-

-

~

~

-

520

430

490

470

480

440

450

500

440

400

450

420

400

430

450

440

440

440

Copper, 

dissolved <ng/L)

<30

<30

<30

<30

<30

<30

<30

<30

<30

<30

<30

<30

<30

<20

<20

<30

<30

<30

<20

<20

<30

<40

<30

<20

<20

Iron, 

dissolved 

<ng/L)

130,000

130,000

130,000

130,000

130,000

130,000

130,000

130,000

130,000

130,000

120,000

130,000

120,000

120,000

110,000

120,000

120,000

120,000

120,000

120,000

120,000

120,000

130,000

120,000

120,000

TABLE 3 93
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 24, 472513111082501--JOHNSON BADWATER MINE SMALL WETLANDS INFLOW NEAR TRACY, MT~Continued

Date

Jul 1994

20...

Aug

16...

Sep

07...

Oct

13...

Nov

15...

Dec

16...

Jan 1995

12...

Feb

22...

Mar

15...

Apr

12...

May

17...

Jun

12...

Jul

11...

Aug

15...

Sep

12...

Oct

10...

Nov

27...

Jan 1996

11...

Feb

21...

Apr

03...

May

06...

Jun

04...

Jul

02...

Aug

07...

Sep

03...

Lead, Lithium, 

dissolved dissolved

<10 360

<10 380

<10 380

<10 360

<10 390

<10 370

<10 380

<1 370

<1 380

<1 370

<1 380

<1 380

<1 360

<1 360

<1 340

<1 360

<1 370

<1 320

<1 370

<1 370

<1 380

<1 360

<1 360

<1 370

<1 360

Manganese, 

dissolved

980

970

990

970

1,000

970

1,000

970

950

980

970

960

940

890

840

890

920

970

940

940

910

910

930

860

900

£JJJ: Nickel, <££& «KEF <ug/L) ball.)

<10 1,100

<10 980

<10 1,100

<10 1,000

<10 1,100

<10 980

<10 1,100

1 1,000

<1 960

<1 1,000

<l 1,000

<1 980

<1 890

<1 920

<l 910

<1 880

<1 940

1 980

<1 970

<1 970

<1 970

<l 960

<1 970

<1 900

<1 930

Qnla nl^JJj Silver,

dissolved dlj*2!r?d 

(ng/L) WV

<1 <3

<5 <3

<1 4

<1 <3

<1 <3

<1 <3

<1 <3

<1 -

<1 <3

<1 <3

<1 <3

<1 <3

<3

<2

<2

<3

<3

<3

 3

<2

<3

<4

<3

<2

 3

Strontium, 

dissolved

1,200

1,200

UOO

1,200

uoo

1,200

1,300

UOO

UOO

UOO

1,200

UOO

1,100

1,100

1,000

1,100

UOO

1,100

1,100

Uoo

1,100

1,100

1,200

1,100

1,100

Vanadium, 

dissolved 

(H9/L)

19

32

33

26

25

21

34

21

6

<6

10

<18

<18

13

<12

<18

<18

<18

15

<12

<18

<24

<18

<12

<12

Zinc, 

dissolved

3,100

2,900

3,200

3,200

3,300

3,000

3,200

3,100

2,800

3,000

2,900

3,000

2,800

2,700

2,500

2,800

2,800

3,200

2,800

2,800

2,700

2,800

2,900

2,600

2,800

94 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 25, 472513111082901-JOHNSON BADWATER MINE LARGE WETLANDS INFLOW NEAR TRACY, MT

Date

Jul 1994

20...

Aug

16...

Sep

07...

Oct

13...

Nov

15...

Dec

16...

Jan 1995

12...

Feb

22...

Mar

15...

Apr

12...

May

17...

Jun

12...

Jul

11...

Aug

15...

Sep

12...

Oct

10...

Nov

27...

Jan 1996

11...

Feb

21...

Apr

03...

May

06...

Jun

04...

Jul

02...

Aug

07...

Sep

04...

Time

0840

1450

0915

1820

1040

0855

0830

1405

1205

0820

1650

1300

1140

1810

1720

1130

1410

1445

1340

0800

1700

0800

1500

1030

1240

Streamflow, instantaneous 

(ffts)

0.01

.01

.01

.004

.01

.009

.008

.008

.006

.005

.007

.007

.01

.01

.01

.01

.01

.01

.01

.01

.01

.01

.01

.01

.01

Specific conductance, 

onslte 

(nS/cm)

4,330

4,350

4,240

4,430

4,520

4,380

4,380

4,320

4,350

4,380

4,320

4,050

3,620

3,620

3,560

3,640

3,890

4,110

4,280

4,340

4,390

4,340

4,440

4,180

4,190

Temperature, 

elr <°C)

18.0

33.0

16.5

9.0

9.0

5.0

1.0

13.0

13.0

-1.0

27.0

24.0

18.0

21.0

25.0

11.0

-2.0

7.5

12.0

-1.0

15.0

18.0

30.0

21.0

18.0

Temperature, 

water <°C)

10.0

11.0

11.5

11.0

11.0

10.0

10.5

9.0

9.0

9.0

9.0

9.0

9.5

10.5

10.5

10.5

10.0

9.5

9.0

8.5

9.0

9.0

9.5

10.5

11.0

pH, 

onsite (standard 

units)

2.7

2.8

2.3

2.7

2.5

2.7

2.6

2.4

2.6

2.6

2.4

2.6

2.7

2.7

2.7

2.6

2.5

2.5

2.6

2.5

2.6

2.5

2.6

2.6

2.6

Hardness, 

total 

(mg/L as 

CaC03)

1,000

1,000

1,100

1,000

1,100

1,100

1,100

1,000

1,100

1,100

1,100

1,100

980

910

910

950

990

1,000

1,100

1,000

1,200

1,100

1,200

1,100

1,100

Calcium dissolved 

(mg/L)

170

160

170

170

180

180

190

170

180

190

180

180

160

150

150

150

150

160

170

170

180

160

180

170

170

Magnesium, dissolved 

(mg/L)

150

150

160

150

150

150

160

150

160

160

160

160

140

130

130

140

150

150

160

150

170

160

170

160

170

Sodium, dissolved 

(mg/L)

24

25

25

24

25

24

25

26

26

27

25

26

25

24

24

24

25

24

25

25

27

23

23

25

26

Sodium adsorption 

ratio

0.3

.3

.3

.3

.3

.3

.3

.4

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

TABLE 3 95
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 25, 472513111082901-JOHNSON BADWATER MINE LARGE WETLANDS INFLOW NEAR TRACY, MT«Continued

Date

Jul 1994

20...

Aug

16...

Sep

07...

Oct

13...

Nov

15...

Dec

16...

Jan 1995

12...

Feb

22...

Mar

15...

Apr

12...

May

17...

Jun

12...

Jul

11...

Aug

15...

Sep

12...

Oct

10...

Nov

27...

Jan 1996

11...

Feb

21...

Apr

03...

May

06...

Jun

04...

Jul

02...

Aug

07...

Sep

04...

Potassium, 

dissolved 

(mg/L)

1.4

1.3

1.3

1.3

1.2

1.5

1.1

1.8

1.7

1.9

2.0

2.3

1.9

1.0

1.1

1.5

1.2

1.2

1.3

1.4

1.6

1.5

1.7

2.0

1.8

Acidity 

(mgVLas

48

48

52

46

47

47

46

47

44

44

42

42

32

30

30

32

38

44

46

45

46

47

48

52

43

Alkalinity, Su|fate

(m$as *JgjJ- CaC03) <m9/L>

e<l 3,200

e<l 3,300

e<l 3,800

e<l 4,000

e<l 3,900

e<l 3,400

e<l 3,700

e<l 4,700

e<l 4,600

e<l 4,700

e<l 4,300

e<l 4,200

e<l 2,800

e<l 2,800

e<l 2,600

e<l 2,600

e<l 2,900

e<l 3,400

e<l 3,500

e<l 3,200

e<l 3,500

e<l 3,300

e<l 3,500

e<l 3,200

e<l 3,300

Chloride, 

dissolved 

(mg/L)

6.7

6.7

7.1

7.2

6.0

6.1

5.4

21

7.6

20

14

5.7

5.6

12

6.3

6.1

5.7

9.8

6.2

8.2

7.2

5.8

4.9

5.9

8.5

Ruoride, 

dissolved 

(mg/L)

<l

<l

2.9

3.9

2.8

-

3.4

5.0

5.1

5.1

5.1

6.1

2.2

<1

3.2

1.8

3.1

1.9

3.7

<3

3.3

2.4

1.1

4.3

4.6

Silica, 

dissolved 

(mg/L as

77

76

76

81

76

77

77

74

74

74

74

74

72

73

71

73

73

79

83

79

87

74

84

75

77

Solids, 

sum of constituents, 

dissolved 

(mg/L)

e4,220

e4,320

e4,860

e5,060

e4,980

e4,450

e4,780

e5,730

e5,620

e5,760

e5,330

e5,260

e3,630

e3,530

e3,340

e3,380

e3,750

e4,370

e4,550

e4,250

e4,570

e4,350

e4,650

e4,250

e4,360

Solids, 

dissolved 

(ton/ 

acre-ft)

e5.74

e5.88

e6.61

e6.88

e6.77

e6.05

e6.50

e7.80

e7.64

e7.84

e7.24

e7.15

e4.94

e4.80

e4.54

e4.60

e5.10

e5.94

e6.18

e5.78

e6.22

e5.92

e6.32

e5.78

e5.92

Solids, 

dissolved 

(ton/d)

eO.15

e.15

6.16

e.05

e.13

e.ll

e.ll

e.12

6.10

e.08

6.10

e.10

6.12

e.ll

6.10

e.10

e.ll

6.13

e.14

6.13

e.12

6.12

e.13

e.ll

e.12

96 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 25, 472513111082901-JOHNSON BADWATER MINE LARGE WETLANDS INFLOW NEAR TRACY, MT»Continued

Date

Jul 1994

20...

Aug

16...

Sep

07...

Oct

13...

Nov

15...

Dec

16...

Jan 1995

12...

Feb

22...

Mar

15...

Apr

12...

May

17...

Jun

12...

Jul

11...

Aug

15...

Sep

12...

Oct

10...

Nov

27...

Jan 1996

11...

Feb

21...

Apr

03...

May

06...

Jun

04...

Jul

02...

Aug

07...

Sep

04...

Aluminum, 

dissolved 

(H9/L)

230,000

230,000

240,000

240,000

230,000

230,000

230,000

220,000

200,000

210,000

210,000

230,000

170,000

150,000

170,000

160,000

190,000

230,000

230,000

250,000

240,000

230,000

250,000

220,000

210,000

Arsenic, Barium, 

dissolved dissolved 

(ng/L) (ng/L)

<1 <3

<1 <3

<1 <3

<1 <4

<1 <10

<1 <3

<1 <4

<1 <3

<1 <3

<1 <3

<1 <10

<1 <4

<1 <3

<1 <2

<2 <3

<1 17

<1 18

<2 9

<1 <5

<1 21

<1 21

<1 23

<1 <10

<5 21

<1 20

Beryl* 

lium, 

dissolved

29

21

30

32

32

32

36

34

34

35

40

37

25

24

22

24

26

28

33

31

34

32

37

36

32

Boron, 

dissolved

280

350

380

380

360

380

330

300

310

310

320

280

250

240

240

260

290

280

290

300

350

270

-

-

-

Cadmium, 

dissolved 

(W/L)

61

100

95

58

100

70

95

81

80

80

69

70

63

68

74

77

80

67

69

86

85

87

83

76

71

Chromium, 

dissolved

40

40

30

30

<50

40

30

20

20

20

<50

30

20

20

40

<20

30

40

40

40

50

60

<50

40

30

Cobalt, 

dissolved 

(H9/L)

2,400

1,100

1,800

3,800

2,000

2,400

2,000

1,100

920

1,000

860

1,000

810

780

750

830

940

940

930

1,200

990

1,100

1,100

1,100

960

Copper, 

dissolved 

(H9/L)

190

200

180

180

160

150

140

130

--

130

120

120

100

110

120

120

140

140

160

140

160

120

150

110

130

Iron, 

dissolved (ng/L)

350,000

360,000

360,000

360,000

390,000

360,000

370,000

350,000

350,000

360,000

340,000

360,000

240,000

180,000

170,000

210,000

240,000

300,000

350,000

350,000

340,000

380,000

410,000

370,000

370,000

TABLE 3 97
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 25, 472513111082901--JOHNSON BADWATER MINE LARGE WETLANDS INFLOW NEAR TRACY, MT--Continued

Date

Jul 1994

20...

Aug

16...

Sep

07...

Oct

13...

Nov

15...

Dec

16...

Jan 1995

12...

Feb

22...

Mar

15...

Apr

12...

May

17...

Jun

12...

Jul

11...

Aug

15...

Sep

12...

Oct

10...

Nov

27...

Jan 1996

11...

Feb

21...

Apr

03...

May

06...

Jun

04...

Jul

02...

Aug

07...

Sep

04...

Lead, Lithium, 

dissolved dissolved 

(ug/L) (ug/L)

<10 390

<10 420

<10 420

<10 400

<10 470

<10 440

<10 450

<1 450

<1 450

<1 460

<1 460

1 460

1 390

<1 350

<1 330

2 360

<1 390

1 390

<1 410

1 420

2 490

1 420

1 380

<1 440

<2 450

Manganese, 

dissolved 

(ug/L)

1,400

1,500

1,500

1,500

1,600

1,500

1,600

1,500

1,500

1,600

1,500

1,600

1,300

1,100

1,100

1,200

1,300

1,400

1,500

1,500

1,700

1,500

1,700

1,500

1,600

Molyb- N| k , Seledenum' dissolved nium'

dissolved dTf2i\ dissolved 

(ug/L) (U9/L) (ug/L)

<10 2,200 <2

<10 2,200 <5

<10 2,200 <2

<10 2,300 <2

<10 2,300 <2

<10 2,200 <1

<10 2,400 <2

1 2,100 1

<1 2,100 <1

<1 2,100 <2

<1 2,100 <2

<1 2,200 <5

<1 1,700

<1 1,600

<1 1,600

<1 1,700

<1 1,900

<1 2,100

<1 2,300

<1 2,200

2 2,500

<1 2,200

<1 2,400

<1 2,100

<1 2,200

Silver, 

dissolved (ug/L)

<3

<3

4

<4

<10

<3

<4

<3

<3

<3

<10

<4

<3

<2

<3

<3

<3

<3

<5

<5

<5

<10

<10

<6

9

Strontium, 

dissolved

980

1,000

1,000

1,000

1,000

1,000

1,100

1,100

1,100

1,200

1,100

1,100

980

960

910

980

1,000

1,000

1,000

1,000

1,200

1,000

1,100

1,100

1,100

Vanadium, 

dissolved

<100

<100

<100

<100

<100

<100

<100

30

43

38

<60

44

25

18

22

24

24

27

47

34

42

64

<60

<36

<36

Zinc, 

dissolved 

(ug/L)

9,000

8,400

8,900

9,400

9,900

8,900

9,400

8,800

8,800

8,800

7,900

8,600

6,800

6,200

6,200

6,800

7,200

8,300

8,900

8,400

9,100

8,900

10,000

8,600

8,400

98 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 26, 472514111082301--JOHNSON BADWATER MINE SMALL WETLANDS OUTFLOW NEAR TRACY, MT

Date

Sepl994

07...

Oct

13...

Nov

15...

Jan 1995

12...

Feb

22...

Mar

15...

Apr

12...

May

17...

Jun

12...

Jul

11...

Aug

15...

Sep

12...

Oct

10...

Nov

27...

Jan 1996

11...

Feb

21...

Apr

03...

May

06...

Jun

04...

Time

0855

1805

1020

0810

1350

1150

0810

1645

1240

1210

1750

1700

1100

1400

1430

1320

0750

1640

0730

Streamflow, Instantaneous 

(ft5/*)

0.002

.003

.006

.005

.006

.004

.005

.003

.004

.003

<.001

<.001

.004

.007

.003

.007

.005

.001

.001

Specific conductance, 

onsite 

(nS/cm)

2,580

2,610

2,610

2390

2,220

2,530

2,510

2,780

2,550

2,530

2,690

2,490

2,450

2340

2,170

2,110

2,100

2,650

2,720

Temperature, 

air (°C)

17.0

9.0

9.0

1.0

12.0

13.0

-.5

27.0

24.0

19.0

21.0

25.0

10.0

-2.0

7.5

12.0

-1.0

16.0

18.0

Temperature, 

water (°C)

12.0

7.5

1.5

1.0

2.5

4.0

1.5

19.0

19.5

19.5

17.0

16.5

8.0

0.0

.5

1.5

.5

10.0

13.5

PH, 

onsite (standard 

units)

2.8

3.0

3.0

3.2

3.0

3.0

3.1

2.6

2.7

3.0

5.9

3.1

2.9

3.0

3.6

3.5

3.7

3.5

3.9

Hardness, 

total 

(mg/Las 

CaC03)

1,200

1,100

1,100

1,200

950

1,100

1,200

1,200

1,200

1,000

1,600

1,200

960

960

1,200

1,100

1,100

510

1,700

Calcium, dissolved 

(mg/L)

220

200

210

230

180

200

230

250

230

200

370

220

170

170

270

220

240

100

340

Magnesium, dissolved 

(mg/L)

150

140

150

140

120

140

150

150

140

130

170

150

130

130

130

130

130

64

200

Sodium, dissolved 

(mg/L)

28

26

28

26

22

26

28

28

27

26

31

29

25

26

23

23

24

11

33

Sodium adsorption 

ratio

0.4

.3

.4

.3

.3

.3

.4

.3

.3

.4

.3

.4

.4

.4

.3

.3

.3

.2

.4

TABLE 3 99
Table 3. Water-quality data for sites in the Sand Coulee Area, Montana, July 1994 through September 1996 (Continued) 

SITE 26, 47251 41 11 082301 --JOHNSON BADWATER MINE SMALL WETLANDS OUTFLOW NEAR TRACY, MT--Continued

Date

Sep 1994

07...

Oct

13...

Nov

15...

Jan 1995

12...

Feb

22...

Mar

15...

Apr

12...

May

17...

Jun

12...

Jul

11...

Aug

15...

Sep

12...

Oct

10...

Nov

27...

Jan 1996

11...

Feb

21...

Apr

OSMay

06...

Jun

04...

Potassium, 

dissolved 

(mg/L)

8.3

8.1

8.0

7.1

6.5

7.6

8.0

8.7

8.0

8.2

2.4

8.3

7.4

6.5

7.6

6.3

6.5

9.3

9.2

Acidity

9.4

11

12

11

9.6

9.8

8.4

8.3

8.8

8.8

2.0

8.5

10

12

5.5

5.5

4.5

3.6

3.4

Alkalinity, Su|fate 

/mn/i « dissolved (3fe? <"*"->

e<l 1,800

e<l 2,100

e<l 2,000

e<l 1,700

e<l 2,500

e<l 2,500

e<l 2,000

e<l 2,100

e<l 2,000

e<l 1,700

e<l 1,700

e<l 1,600

e<l 1,500

e<l 1,700

e<l 1,600

e<l 1,300

e<l 1,400

e<l 1,900

e<l 1,900

Chloride, 

dissolved 

(mg/L)

6.1

7.9

7.5

5.8

4.8

7.8

7.3

10

6.9

6.1

7.6

6.6

6.1

5.6

9.8

5.5

7.6

9.7

7.6

Fluoride, 

dissolved 

(mg/L)

9.2

8.0

6.7

6.8

5.9

8.0

5.9

6.5

7.1

5.5

2.7

4.8

5.8

7.6

4.8

6.5

5.5

5.5

4.5

Silica, 

dissolved 

(mg/L ss

52

50

50

43

37

44

39

42

45

52

24

49

48

46

32

33

34

33

Solids,

sum of constituents, 

dissolved

(mg/L)

e2,360

e2,650

e2,590

e2,260

e2,960

e3,030

e2,560

e2,670

e2,550

62,210

e2,320

e2,140

el, 990

e2,200

e2,140

el, 780

el, 890

e2,150

e2,560

Solids, 

dissolved 

(ton/ 

acre-fl)

e3.21

e3.60

e3.52

e3.08

64.03

e4.12

e3.48

e3.63

e3.46

e3.01

e3.16

e2.91

e2.70

e2.99

e2.91

e2.42

e2.57

e2.92

e3.49

Solids, 

dissolved 

(ton/d)

eO.Ol

e.02

e.04

e.03

e.05

e.03

e.03

e.02

e.03

e.02

<.01

<.01

e.02

e.04

e.02

e.03

e.03

6.01

e.01

100 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 26, 472514111082301-JOHNSON BADWATER MINE SMALL WETLANDS OUTFLOW NEAR TRACY, MT--Continued

Date

Sep 1994

07...

Oct

13...

Nov

15...

Jan 1995

12...

Feb

22...

Mar

15...

Apr

12...

May

17...

Jun

12...

Jul

11...

Aug

15...

Sep

12...

Oct

10...

Nov

27...

Jan 1996

11...

Feb

21...

Apr

03...

May

06...

Jun

04...

Aluminum, 

dissolved 

(M9/U

61,000

59,000

57,000

48,000

42,000

50,000

43,000

41,000

44,000

43,000

3,300

46,000

47,000

48,000

33,000

34,000

32,000

33,000

26,000

Arsenic, Bsrium, 

dissolved dissolved 

(H9/L) (H9/L)

<1 14

<1 9

<1 7

<1 8

<1 6

<1 7

<1 7

<1 15

<1 10

<1 9

<1 14

<1 13

<1 13

<1 12

<1 12

<1 8

<1 11

<1 4

<1 16

Beryllium, 

dissolved 

(M9/L)

27

27

27

23

18

22

20

22

22

20

3

23

24

23

15

16

14

5

13

Boron, 

dissolved

330

310

290

250

220

270

250

290

260

280

300

290

280

270

200

190

210

270

320

Cadmium, 

dissolved 

(H9/L)

<3

<3

5

<3

2

2

2

2

2

2

<1

2

2

2

1

2

1

1

<1

Chromium, 

dissolved 

(M9/U

<20

<20

<20

<20

<20

<20

<20

<20

<20

<20

<10

<10

20

<5

<20

<5

<5

<5

<15

Cobalt, 

dissolved 

(H9/L)

520

670

660

540

390

440

400

280

350

390

200

410

430

400

400

330

210

340

320

Copper, 

dissolved 

(H9/L)

<30

<30

<30

<30

<30

<30

<30

<30

<30

<30

<20

<20

<30

<10

<30

<10

<10

<10

<30

Iron, 

dissolved 

(H9/L)

17,000

38,000

60,000

47,000

37,000

41,000

40,000

27,000

32,000

32,000

4,800

22,000

39,000

50,000

22,000

12,000

5,900

4,200

2,900

TABLE 3 101
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued)

SITE 26, 47251 41 11 082301 -JOHNSON BADWATER MINE SMALL WETLANDS OUTFLOW NEAR TRACY, MT-Continued

Date

Sep 1994

07...

Oct

13...

Nov

15...

Jan 1995

12...

Feb

22...

Mar

15...

Apr

12...

May

17...

Jun

12...

Jul

11...

Aug

15...

Sep

12...

Oct

10...

Nov

27...

Jan 1996

11...

Feb

21...

Apr

03...

May

06...

Jun

04...

Lead, Lithium, 

dissolved dissolved

<10 420

<10 370

<10 410

<10 370

<1 320

<1 380

<1 360

<1 370

<1 370

<1 360

<1 300

<1 380

<1 370

<1 380

<1 280

<1 290

<1 290

1 110

<1 350

Manganese, 

dissolved

1,300

1,100

1,100

1,100

890

970

940

1,000

1,000

1,100

1,500

1,300

990

930

1,000

960

670

380

1,100

Molyb- Nickel Sele~ 

denum, ji..«i..^j nium, 

dissolved dlf8fS?d dissolved 

<ug/L) (tign-' (ug/L)

<10 1,100 <1

<10 1,000 <1

<10 1,100 <1

<10 1,000 <1

<1 810 <1

<1 950 <1

<1 830 <1

<1 930 <1

<1 870 <2

<1 860

<1 400

<1 870

<1 860

.

<1 890

<1 710

<1 670

<1 570

<1 230

<1 610

Silver, 

dissolved 

(MI/L)

7

<3

4

<3

<3

<3

<3

<3

3

<3

<2

<2

<3

<1

<3

3

<1

<1

<3

Strontium, 

dissolved 

(M9/L)

1,500

1,300

1,300

1,400

1,100

1,300

1,400

1,400

1,400

1,300

1,900

1,400

uoo

uoo

1,400

uoo

uoo

530

1,900

Vana- 2nc

diSTved -jar1 

(ug/L) b&l.)

<18 3,300

<18 3,100

<18 3,400

<18 2,900

<18 2,300

<18 2,600

<18 2,300

<18 2,400

<18 2,600

<18 2,500

<12 690

<12 2,300

<18 2,700

<6 2,600

<18 2,000

<6 1,900

<6 1,700

<6 530

<18 1,600

102 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water In the Sand Coulee Coal 

Area, Montana
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 27, 472517111081001--JOHNSON GOODWATER MINE SMALL WETLANDS INFLOW NEAR TRACY, MT

Date

Jul 1994

20...

Aug

16...

Sep

07...

Oct

13...

Nov

15...

Dec

16...

Jan 1995

12...

Feb

22...

Mar

15...

Apr

12...

May

17...

Jun

12...

Jul

11...

Aug

15...

Sep

12...

Oct

10...

Nov

27...

Jan 1996

11...

Feb

21...

Apr

03...

May

06...

Jun

04...

Jul

02...

Aug

07...

Sep

04...

Time

0810

1410

0815

1745

0945

0810

0740

1320

1125

0730

1615

1125

1240

1720

1620

1030

1330

1400

1300

0710

1600

0700

1400

0945

1150

Streamflow, instantaneous 

(ft5/*)

0.0002

.0002

.0002

.0002

.0002

.0002

.0002

.0001

.0001

.0001

.0002

.0002

.0002

.018

.013

.013

.011

.010

.011

.009

.009

.008

.010

.009

.009

Specific conductance, 

onsite 

(uS/cm)

1,290

1,240

1,210

1,210

1,230

1,260

1,220

1,250

1,250

1,250

1,280

1,060

1,010

1,200

1,180

1,190

1,110

1,120

1,160

1,140

1,170

1,170

1,150

1,140

1,140

Temperature, 

air (°C)

16.0

33.0

15.0

9.5

9.0

4.5

1.0

11.5

12.0

-.5

25.5

20.5

19.5

23.0

27.0

10.0

-2.0

7.5

8.5

-1.0

16.0

16.0

29.0

20.0

17.0

Temperature, 

water <°C)

13.5

16.5

13.0

10.0

7.0

4.5

4.5

4.5

6.0

5.0

11.0

11.5

13.5

10.0

10.0

10.0

9.5

9.0

12.0

8.5

9.0

9.5

9.5

10.0

10.0

PH, 

onsite (standard 

units)

7.3

7.8

7.2

7.8

7.2

7.3

7.2

7.5

7.8

7.1

7.4

7.8

7.9

7.0

6.9

6.8

7.0

6.8

6.8

6.6

6.8

6.9

6.9

6.8

7.0

Hardness, 

total 

(mg/Las 

CsC03)

720

670

670

680

670

710

700

690

650

730

680

560

520

630

610

630

600

630

600

640

630

650

620

570

600

Calcium, dissolved 

(mg/L)

130

120

120

120

120

130

120

120

110

130

120

99

91

89

84

88

83

92

88

93

92

95

86

80

84

Magnesium, dissolved 

(mg/L)

96

90

90

91

90

94

96

94

90

99

92

76

72

99

97

100

94

98

93

99

96

100

97

89

94

Sodium, dissolved 

(mg/L)

17

18

18

18

18

18

18

18

18

19

17

16

15

18

18

18

18

18

18

19

18

18

17

17

17

Sodium adsorption 

ratio

0.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

.3

TABLE 3 103
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 27, 472517111081001-JOHNSON GOODWATER MINE SMALL WETLANDS INFLOW NEAR TRACY, MT--Continued

Date

Jul 1994

20...

Aug 

16...

Sep

07...

Oct

13...

Nov

15...

Dec

16...

Jan 1995

12...

Feb

22...

Mar

15...

Apr 

12...

May 

17...

Jun

12...

Jul

11...

Aug 

15...

Sep 

12...

Oct

10...

Nov

27...

Jan 1996

11...

Feb

21...

Apr 

03...

May 

06...

Jun

04...

Jul

02...

Aug

07...

Sep 

04...

Potassium, 

dissolved 

(mg/L)

5.5

5.3

5.3

5.1

5.1

5.3

4.8

5.0

5.0

4.8

4.9

5.0

5.1

4.5

4.6

4.3

4.2

4.4

4.1

4.2

4.4

4.5

4.3

4.8

4.2

Acidity 

(mg/L as H+)

0.4

.2

.2

.1

.4

.2

.6

<.l

<1

.1

<.l

<.l

<1

.4

.1

.1

1.7

.1

.4

.4

.3

<.l

.2

<1

.3

Alkalinity, 

lab 

(mg/L as 

CaC03)

270

264

270

275

274

267

266

265

264

268

255

270

281

174

180

184

208

200

202

199

201

203

211

211

213

Sulfate, 

dissolved 

(mg/L)

480

450

430

450

430

450

450

460

420

420

420

290

270

450

480

470

440

460

440

450

450

460

420

430

430

Chloride, 

dissolved 

(mg/L)

7.7

8.1

7.5

8.1

7.6

7.7

7.2

7.6

8.3

6.3

8.8

6.7

6.4

6.9

6.9

7.4

7.1

6.2

7.2

7.0

6.9

6.8

6.5

6.9

7.1

Fluoride, 

dissolved 

(mg/L)

1.2

1.1

1.2

1.2

1.4

1.3

1.2

1.2

1.3

1.2

1.2

1.6

1.5

1.4

1.2

1.3

1.5

1.5

1.4

1.5

1.5

1.3

1.4

1.3

1.3

Silica, 

dissolved **y

12

11

11

12

11

12

11

11

11

12

11

11

10

9.1

8.4

8.4

8.3

8.7

8.4

8.8

8.6

8.8

8.7

7.7

7.9

Solids, 

sum of constituents, 

dissolved 

<mg/L)

912

863

846

871

848

879

869

877

823

854

829

668

640

787

811

810

782

810

783

803

799

818

769

764

774

Solids, 

dissolved 

(ton/ 

acre-ft)

1.24

1.17

1.15

1.18

1.15

1.20

1.18

1.19

1.12

1.16

1.13

.91

.87

1.07

1.10

1.10

1.06

1.10

1.06

1.09

1.09

1.11

1.05

1.04

1.05

Solids, 

dissolved 

(ton/d)

<.01

<.01

<.01

<01

<.01

<.01

<.01

<.01

<.01

<.01

<.01

<.01

<.01

.04

.03

.03

.02

.02

.02

.02

.02

.02

.02

.02

.02

104 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 27, 472517111081001-JOHNSON GOODWATER MINE SMALL WETLANDS INFLOW NEAR TRACY, MT-Continued

Date

Jul 1994

20...

Aug

16...

Sep

07...

Oct

13...

Nov

15...

Dec

16...

Jan 1995

12...

Feb

22...

Mar

15...

Apr

12...

May

17...

Jun

12...

Jul

11...

Aug

15...

Sep

12...

Oct

10...

Nov

27...

Jan 1996

11...

Feb

21...

Apr

03...

May

06...

Jun

04...

Jul

02...

Aug

07...

Sep

04...

 Arsenic,

dissolved diff°ivfd 

(ug/L) WW

<10 <1

20 <1

<10 <1

<10 <1

20 <1

<10 <1

10 <1

<10 <1

<10 <1

<10 <1

<10 <1

30 <1

<10 <1

30 <1

30 <1

50 <1

30 <1

<10 <1

10 <1

10 <1

<10 <1

30 <1

6 <1

9 <1

10 <1

Barium, °®^'"

diff«iV?d dissolved 

<M^) <ng/L)

28 <0.5

26 <.5

27 <.5

26 <.5

26 <.5

27 <5

28 <.5

25 <.5

24 <.5

27 <.5

25 <.5

24 <.5

23 <.5

23 .5

21 <.5

22 <.5

20 <.5

19 <.5

19 <.5

18 <.5

19 <.5

19 <2

18 <.5

18 <.5

18 <.5

Boron, .

("9/I-) dlfiStr

140 <1

130 <l

110 <1

120 <1

120 <1

120 <1

120 <1

100 <1

110 <1

110 <l

110 <1

90 <1

90 <1

120 <1

130 <1

130 <1

100 <1

120 <1

130 <1

130 <I

110 <1

120 <3

no <i

100 <1

120 <l

unroSg/L)

<5

<5

<5

<5

<5

<5

<5

<5

<5

<5

<5

<5

<5

<5

<5

<5

<5

<5

<5

<5

<5

<20

<5

<5

<5

Cobalt, Copper,

<3 <10

<3 <10

<3 <10

<3 <10

<3 <10

<3 <10

<3 <10

1 <10

<l <10

<l <10

<3 <10

<3 <10

<3 <10

40 <10

30 <IO

20 <10

8 <10

<3 <10

8 <10

6 <IO

<3 <10

<9 <30

4 <10

<3 <10

4 <10

Iron,

<3

10

13

4

<3

<3

10

4

<3

10

7

<3

<3

3,200

1,600

920

410

470

680

430

250

410

160

150

160

TABLE 3 105
Table 3. Water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through September 1996 (Continued) 

SITE 27, 472517111081001-JOHNSON GOODWATER MINE SMALL WETLANDS INFLOW NEAR TRACY, MT--Continued

Date

Jul 1994

20...

Aug

16...

Sep

07...

Oct

13...

Nov

15...

Dec

16...

Jan 1995

12...

Feb

22...

Mar

15...

Apr

12...

May

17...

Jun

12...

Jul

11...

Aug

15...

Sep

12...

Oct

10...

Nov

27...

Jan 1996

11...

Feb

21...

Apr

03...

May

06...

Jun

04...

Jul

02...

Aug

07...

Sep

04...

Lead, Lithium, 

dissolved dissolved 

(H9/L) (ug/L)

<10 95

<10 94

<10 92

<10 89

<10 92

<10 94

<10 94

<1 89

<1 86

<1 94

<10 89

<10 77

10 67

20 97

<10 94

10 95

<10 88

<10 88

20 90

20 92

<10 93

40 92

<10 91

<10 84

<10 86

Manganese, 

dissolved 

(ug/L)

5

3

4

13

32

32

30

23

17

32

7

4

2

170

110

99

71

64

87

78

48

61

41

23

25

XSaZ Nickel' 

QenUm, rtl«snlu«H dissolved dif,!°nx (ug/L) (W*71-)

<10 <10

<10 20

<10 20

<10 10

<10 30

<10 30

<10 20

<1 20

<1 20

<1 <10

<10 10

<10 <10

<10 <10

10 80

<10 60

<10 60

<10 50

<10 50

<10 40

<10 50

<10 50

<30 40

<10 40

<10 40

<10 60

Selenium, 

dissolved

1

<5

2

2

2

2

2

2

2

3

3

3

-

-

-

-

-

-

_

-

_

-

Silver, Stron-

*5fr'1 disced <«">-> (ug/L)

<1 680

<1 660

<1 630

<1 620

1 610

<1 640

<1 680

<1 640

<1 610

1 670

<1 640

<1 550

<1 490

2 660

<1 630

3 640

<1 620

<1 640

<1 660

<1 640

<1 670

<3 690

<1 650

<1 610

2 640

Vanadium, 

dissolved 

(ug/L)

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<18

<6

<6

<6

Zinc, 

dissolved

31

22

39

40

36

34

34

29

23

33

19

15

13

140

100

120

73

73

66

65

57

82

65

61

48

106 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
Table 4. Chemical analyses of field replicates for water samples from sites in the Sand Coulee Coal Area, Montana, July 1994 

through September 1996

[Site number shown in figure 2 or 3. Abbreviations: ft3/s, cubic feet per second; °C, degrees Celsius; e, estimated; lab, laboratory; ng/L, micrograms per liter; 

jiS/cm, microsimens per centimeter at 25 °C; mg/L, milligrams per liter. Symbols: <, less than; , no data]

SITE 2, 06078250--COTTONWOOD CREEK NEAR STOCKETT, MT

Date

May 1996 

06... 

06...

Time

1300 

1305

Calcium, dissolved 

(mg/L)

160 

160

Magnesium, dissolved 

(mg/L)

73 

74

Sodium, Potasdis- slum, Acidity 

solved dissolved (mg/L) 

(mg/L) (mg/L)

11 

11

4.4 <0.1 

4.5 .1

Alkalinity, 

lab 

(mg/L as 

CsC03)

153 

152

« 

550 

540

Chloride, 

dissolved 

(mg/L)

5.6 

5.5

Ruoride, 

dissolved 

(mg/L)

0.8

.8

Date

May 1996 

06... 

06...

Silica, 

dissolved 

(mg/L)

3.5 

3.5

Aluminum, 

dissolved 

(ug/L)

210 

240

Arsenic, 

dissolved 

(ug/L)

*[

Barium, 

dissolved 

(ug/L)

24 

25

Beryllium, 

dissolved 

(ug/L)

<0.5

Boron, 

dissolved 

(ug/L)

80 

80

Csdmium, 

dissolved 

(ug/L)

3

Chromium, 

dissolved (ug/L)

<5 

<5

Cobalt, 

dissolved 

(ug/L)

60 

60

Copper, 

dissolved 

(ug/L)

<10 

<10

Dste

May 1996 

06... 

06...

Iron, 

dissolved 

(ug/L)

<0.3 

8

Lead, 

dissolved 

(ug/L)

:s

Lithium, 

dissolved 

(ug/L)

46 

44

Manganese, 

dissolved 

(ug/L)

150 

150

Molybdenum, 

dissolved 

(ug/L)

<10

Nickel, 

dissolved 

(ug/L)

120 

110

Silver, 

dissolved 

(ug/L)

<[

SITE 4, 06078270--SAND COULEE AT SAND COULEE,

Date

Jun 1995 

13... 

13... 

Jul 1996 

02... 

02...

Time

1150 

1155

0820 

0825

Cslcium, dissolved 

(mg/L)

110 

120

180 

190

Magnesium, dissolved 

(mg/L)

85

88

120 

130

Sodium, dissolved 

(mg/L)

20 

21

22 

22

Potassium, 

dissolved 

(mg/L)

3.5 

3.5

2.6 

2.5

Acidity 

(mg/LJ

11

12

33 

32

Alkalinity, 

Isb 

(mg/L as 

CaC03)

S

Strontium, 

dissolved 

(ug/L)

450 

460

MT

Sulfate, 

dissolved 

(mg/L)

1,700 

1,600

2,700 

2,600

Vanadium, 

dissolved 

(ug/L)

<6 

<6

Chloride, 

dissolved 

(mg/L)

8.5 

8.6

7.1

7.7

Zinc, 

dissolved 

(ug/L)

22 

24

Ruoride, 

dissolved 

(mg/L)

1.7 

2.5

.7 

.7

Date

Jun 1995 

13... 

13... 

Jul 1996 

02... 

02...

Silica, 

dissolved 

(mg/L)

26

27

57 

58

Aluminum, 

dissolved 

(ug/L)

73,000 

74,000

190,000 

190,000

Arsenic, 

dissolved 

(ug/L)

2 

2

Barium, 

dissolved 

(ug/L)

120 

130

11 

9

Beryllium, 

dissolved 

(ug/L)

11 

12

26 

26

Boron, 

dissolved 

(ug/L)

140 

120

200 

160

Cadmium, 

dissolved 

(ug/L)

9 

9

21 

22

Chromium, 

dissolved 

(ug/L)

<5 

<5

60 

<40

Cobalt, 

dissolved 

(ug/L)

270 

260

790 

800

Copper, 

dissolved 

(ug/L)

20 

20

<80 

<80

Date

Jun 1995 

13... 

13... 

Jul 1996 

02... 

02...

Iron, 

dissolved c 

(ug/L)

86,000 

88,000

150,000 

150,000

Lead, 

lissolved <

1

Lithium, "Ali8" JSSSt Nickel' 

"SSKT1 di8S°'«d d*80'ved d ft5i?

Vr^y* / /i in/I \ /nn/t \ VH'SJ' / \Hy * / Vr^y * /

190 

200

380 

380

1,100 <1 

1,100 <1

2,600 <1 

2,700 <1

750 

760

1,600 

1,700

Selenium, Silver, SfJJj""

d dif,f«nV?d dWiT1 dissolved (ug/L) (ug/L) (ug/L)

-

10

<8

730 

760

950 

970

Vanadium, 

dissolved 

(ug/L)

<6 

<6

<48 

<48

Zinc, 

dissolved 

(ug/L)

3,000 

3,000

6,800 

6,900

TABLE 4 107
Table 4. Chemical analyses of field replicates for water samples from sites in the Sand Coulee Coal Area, July 1994 

through September 1996 (Continued)

SITE 5, 06090590--ANACONDA DRAIN AT BELT, MT

Date

Oct 1995 

12... 

12...

Calcium, \SSI3f" Sodium, Potas- Alkalinity, CM»«*« 

Timo dls- Hie?1 dls' 8lum> Acidity lab HI««I»«H 

 * solved s d,!Jd solved dissolved (mg/L) (mg/L as JJJj/L)

1145 150 67 9.7 2.7 23 e<l 1,900 

1150 150 69 10 2.7 22 e<l 1,800

Chloride, 

dissolved 

(mg/L)

2.5 

2.6

Fluoride, 

dissolved 

(mg/L)

1.5 

1.2

Date

Oct 1995 

12... 

12...

Silica aiuca, Alum" Arsenic Barium BerV1' Boron C**1 Chro' Inum Arsenic, oanum, Hum ooron, mlum mium

dSE/L?d dissolved "'jJJSfr1 dlfSfd dissolved diff(Sff d dissolved dissolved 

I*** (ug/L) <U9/L> <U9/L> (ug/L) <WU (ug/L) (ug/L)

58 110,000 1 11 16 180 10 50 

58 110,000 2 10 17 170 10 40

Cobalt, 

dissolved

360 

360

Copper, 

dissolved 

(H9/L)

40 

<30

Date

Oct 1995 

12... 

12...

Iron, Lead, Lithium, "I*"9-8" SSfe Nickel, Selenium, Silver, St.1 ' 

dissolved dissolved dissolved dissolved dissolved dissolved dissolved dissolved dissolved

180,000 <1 190 410 <1 820 - <3 1,500 

180,000 1.0 200 420 <1 800 - <3 1,500

Vanadium, 

dissolved

32

Zinc, 

dissolved

3,600 

3,600

SITE 6, 471851111111101--GIFFEN SPRING NEAR STOCKETT, MT

Date

Jul 1994 

21... 

21... 

Sep 1996 

03... 

03...

Calcium, 1agJ]f~ Sodium, Potas- Alkalinity, G,,u*t* 

 nma dls- di*-' dl* 8ium' Acidity lab di3w»d solved soiJad solved dissolved (mg/L) (mg/L as Sia/LA 

(mg/L) (mg/L) (wg/L) (mg/L) CaCO3) im9"-J

0845 110 42 14 5.4 4.5 e<l 740 

0850 120 42 14 5.3 4.5 <1 740

1015 110 43 15 5.3 1.5 e<l 550 

1015 110 41 14 5.5 1.5 e<l 540

Chioride, 

dissolved 

(mg/L)

3.1 

3.2

4.0 

3.6

Fiuorlde, 

dissolved 

(mg/L)

0.4 

.5

.8 

.8

Date

Jul 1994 

21... 

21... 

Sep 1996 

03... 

OSSilica, Alum- Arsenic, Barium, Beryl- Boron, ^^~ Chrod?m2n d dissoKed dl?ffS?d dlfSf d dissUoTved dlf1s°ivfd dilsSlved dissolved

(m«/L) (Ugfl.) b&l.) (H9fl-) /^g/L) (^9^-) (^gfl.) (^gfl.)

21 15,000 <1 24 6 90 8 <5 

21 15,000 <1 24 6 110 6 <5

18 2,000 <1 25 3 50 3 <5 

18 2,000 1 25 2 50 3 <5

Cobalt, 

dissolved

380 

500

130 

150

Copper, 

dissolved 

(ug/L)

20 

20

Date

Jul 1994 

21... 

21... 

Sep 1996 

03... 

03...

Iron, Lead, Lithium, "Si9,8" fiffim Nickel, Selenium, Silver, ftrondissolved dissolved dissolved Hile^iT,'^ HiBc«iwl'H dissolved dissolved dissolved HinLftw'^ i,,~n \ i..*n \ /.,n/i \ dissolved dissolved /....n \ i,,~n \ i, ,nii \ dissolved (ug/L) (ug/L) (ug/L) (pglL) ^g/L) *ug/L' W9"-) (M9/L) (ngtL)

81,000 <10 68 370 <10 390 <1 2 350 

83,000 <10 75 380 <10 430 <1 <1 360

54,000 <1 67 340 <1 270 - <1 340 

52,000 <1 66 330 1 270 - <1 330

Vanadium, 

dissolved 

(M9/D

17 

13

<6 

<6

Zinc, 

dissolved

1,600 

1,600

1,100 

1,100

108 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coai 

Area, Montana
Table 4. Chemical analyses of field replicates for water samples from sites in the Sand Coulee Coal Area, July 1994 

through September 1996 (Continued)

SITE 7, 472016111085701--COTTONWOOD MINE NO. 6 DRAIN TO COTTONWOOD CREEK NEAR STOCKETT, MT

Date

Jan 1996 

10... 

10... 

Jun 

03... 

03...

Time

1450 

1455

1710 

1715

Calcium, ^If" Sodium, Potas- Alkalinity, e,,i*ate 

dis- 8iu ' dis- slum, Acidity lab * JEEfid 

solved d.'* solved dissolved (mg/L) (mg/Las *J!Su

('"a'1-) oS (mg/L) (mg/L) Ca^°3)

380 140 13 2.4 87 e<l 6,200 

350 140 14 2.4 86 e<l 6,000

350 140 14 3.0 85 e<l 7,200 

350 140 14 2.9 83 e<l 7,100

Chloride, 

dissolved 

(mg/L)

<0.10 

<.10

3.8 

3.8

Fluoride, 

dissolved 

(mg/L)

<l 

<l

Date

Jan 1996 

10... 

10... 

Jun 

03... 

03...

SH'ca. J!um" Arsenic, Barium, ftm"" Boron' mi?.m Sil dSSS3d *S&d -assr1 Tar1 *S8" d±/L?d d'2oSed dialled (mg/L) (ug/L) (ug/L) (ug/L) ^g/L) (ug/L) ^j ^g/L)

99 

95

98 

99

450,000 <2 130 120 530 72 60 

450,000 <2 120 120 530 79 <50

420,000 <10 120 130 300 84 <80 

420,000 <10 130 120 350 88 80

Cobalt, 

dissolved 

(ug/L)

3,900 

7,100

6,200 

6,900

Copper, 

dissolved 

(ug/L)

<100 

120

110 

<150

Date

Jan 1996 

10... 

10... 

Jun 

03...

OSIron, 

dissolved 

(ug/L)

810,000 

830,000

840,000 

850,000

Lead, Lithium, *S2?" j£3fm Nicke'. Selenium, Silver, Strew-

*t£S* diSfd *3k diSSiSd difus^d dif*^fd di^fd disLoTved (ug/L) (ug/L) ^ugy,_j ^^ (ug/L) (ug/L) (ug/L) ^ug/Lj

<1 670 2,500 2 12,000 -- <10 1,300 

<1 670 2,500 1 11,000 - <10 1,300

<1 700 2,400 <1 11,000 -- <10 UOO 

<1 710 2,400 <1 12,000 -- <15 1,300

Vanadium, 

dissolved 

(ug/L)

130 

110

150 

150

Zinc, 

dissolved 

(ug/L)

56,000 

54,000

55,000 

56,000

SITE 9, 47221 21 11 093301 -NUMBER FIVE COULEE NEAR STOCKETT, MT

Date

Apr 1995 

11... 

11...

Time

1800 

1805

Calcium, M^T Sodium, Potas- Alkalinity, Qlli«atA 

dis- "H?1 ' dis- slum, Acidity lab JSXSSLt 

solved *Jj solved dissolved (mg/Lj (mg/Las d'SS/ud 

(mgrt.) JJJJJ (mg/L) (mgrt.) CaCO3) (m9/L>

98 35 24 5.4 <0.1 33 380 

95 34 24 5.2 <.l 33 360

Chloride, 

dissolved 

(mg/L)

4.4 

3.6

Fluoride, 

dissolved 

(mg/L)

0.4 

.5

Date

Apr 1995 

11... 

11...

Silica, 

dissolved 

(mg/L)

6.2 

6.0

Alum- * «».,!.. Bar!,,m Beryl- onrnn Cad- Chro- i^nm Arsenic, Barium, n,.JL Boron, _ .i.. . «.! «.

mum, HifittnluaH HiaonluaH llUm, HiaonlwaH miUHI, miUITI, dissolved dif1ff'/,vfd ,*2n\° dissolved dif,8f>nVfd dissolved dissolved (ug/L) ^9/L> OiOAJ (ugfl.) (ugrt-) ^g/L) (ugrt.)

70 <1 120 <0.5 60 <1 <5 

50 <1 110 <.5 60 <1 <5

Cobalt, 

dissolved 

(ug/L)

20 

20

Copper, 

dissolved 

(ug/L)

<10 

<10

Date

Apr 1995 

11... 

11...

Iron, 

dissolved 

(ug/L)

6 

<3

Lead, Lithium, "SgT JSJJ5: Nickel, Selenium, Silver, fl ' S"J!f

difuSffid dWfd *SS«i *S5t«l dKL?d a-a?11 diSfd disLoTved diS'ed (ugrt.) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L)

<1 49 270 <1 40 <1 <1 260 

<1 50 260 1 40 <1 <1 260

<6 

<6

Zinc, 

dissolved (ug/L)

20 

20

TABLE 4 109
Table 4. Chemical analyses of field replicates for water samples from sites in the Sand Coulee Coal Area, Montana, July 1994 

through September 1996 (Continued)

SITE 10, 472233110552601-FRENCH COULEE WETLANDS OUTFLOW AT BELT, MT

Date

Sep 1995 

14... 

14...

Calcium, 

TI,_« dis- 

"m* solved 

(mg/L)

0930 

0935

250 

250

^?nJf" Sodium, Potas- 

*!"!"' dis- slum, 

J?iuL< 9olved dissolved 

SS/L) <m9"-> <m9/L>

92 

97

18 

20

3.8 

3.7

Alkalinity, 

Acidity lab 

(mg/L) (mg/L as 

CaCO3)

38 

37

e<l 

e<l

SuKate, 

dissolved 

(mg/L)

2,900 

3,000

Chloride, 

dissolved 

(mg/L)

17 

18

Ruoride, 

dissolved 

(mg/L)

1.8 

2.1

Date

Sep 1995 

14... 

14...

Silica, 

dissolved 

(mg/L)

86

88

Aluminum, 

dissolved 

(H9/L)

240,000 

230,000

Arsenic, 

dissolved 

(H9/L)

<2 

<2

Barium, 

dissolved 

(H9/L)

4 

4

Beryllium, 

dissolved 

(M9/L)

26

27

Boron, 

dissolved

(ng/D

170 

180

Cadmium, 

dissolved 

(H9/L)

3 

3

Chromium, 

dissolved 

(M9/L)

50 

60

Cobalt, 

dissolved 

(WP/L)

180 

180

Copper, 

dissolved 

<H9/L)

30 

<30

Date

Sep 1995 

14... 

14...

Date

Apr 1996 

04... 

04...

Iron, 

dissolved 

(H9/L)

170,000 

170,000

SITE

Time

1130 

1135

Lead, 

dissolved

(ng/L)

<1 

<1

Lithium, 

dissolved 

(M9/L)

280 

310

Manganese, 

dissolved 

(M9/L)

1,100 

1,100

Molybdenumm 

dissolved 

(H9/L)

<1 

<l

Nickel, 

dissolved 

(H9/L)

350 

380

12, 4722351 1 0553202--FRENCH COULEE WETLANDS

Calcium, dissolved 

(mg/L)

190 

190

Magnesium, dissolved 

(mg/L)

94 

92

Sodium, dissolved 

(mg/L)

13 

12

Potassium, 

dissolved 

(mg/L)

5.3 

5.4

Acidity 

(mg/LJ

79 

78

Silver, 

dissolved 

(H9/L)

<2 

<3

Strontium, 

dissolved 

(M9/L)

1,300 

1,400

Vanadium, 

dissolved 

(M9/L)

<12 

<18

Zinc, 

dissolved 

(M9/L)

1,300 

1,300

INFLOW NO. 2 AT BELT, MT

Alkalinity, 

lab 

(mg/L as 

CaCO3)

e<l 

e<l

Sulfate, 

dissolved 

(mg/L)

5,300 

5,000

Chloride, 

dissolved 

(mg/L)

9.6 

9.3

Ruoride, 

dissolved 

(mg/L)

3.9 

4.0

Date

Apr 1996 

04... 

04...

Silica, 

dissolved 

(mg/L)

100 

100

Aluminum, 

dissolved 

(H9/L)

430,000 

410,000

Arsenic, 

dissolved 

(H9/L)

<2 

<2

Barium, 

dissolved 

(H9/L)

13 

14

Beryllium, 

dissolved 

(H9/L)

48 

43

Boron, 

dissolved 

(H9/L)

330 

340

Cadmium, 

dissolved 

(M9/L)

7 

6

Chromium, 

dissolved 

(H9/L)

140 

150

Cobalt, 

dissolved 

(H9/L)

350 

360

Copper, 

dissolved 

(H9/L)

<100 

<100

Date

Apr 1996 

04... 

04...

Iron, 

dissolved 

(M9/L)

870,000 

850,000

Lead, 

dissolved 

(H9/L)

2 

2

Lithium, 

dissolved 

(M9/L)

520 

520

Manganese, 

dissolved 

(M9/L)

750 

730

Molybdenum, 

dissolved 

(M9/L)

<1 

<1

Nickel, 

dissolved 

(H9/L)

870 

840

Silver, 

dissolved 

(H9/L)

<10 

<10

Strontium, 

dissolved 

(H9/L)

1,800 

1,800

Vanadium, 

dissolved 

(H9/L)

72 

95

Zinc, 

dissolved 

(H9/L)

4,000 

4,100

110 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water In the Sand Coulee Coal 

Area, Montana
Table 4. Chemical analyses of field replicates for water samples from sites in the Sand Coulee Coal Area, Montana, July 1994 

through September 1996 (Continued)

SITE 13, 472305110551701--LEWIS COULEE ABOVE CASTNER PARK, AT BELT, MT

Date

Jul 1995 

13... 

13...

Time

0950 

0955

Calcium, dissolved 

(mg/L)

190 

180

Magnesium, dissolved 

(mg/L)

120 

120

Sodium, dissolved 

(mg/L)

27 

27

Potassium, 

dissolved 

(mg/L)

1.1 

1.1

Acidity 

(mg/L)

63

62

Alkalinity, 

lab 

(mg/L as 

CaCOg)

e<l 

e<l

Sulfate, 

dissolved 

(mg/L)

4,800 

4,600

Chloride, 

dissolved 

(mg/L)

5.2 

5.0

Fluoride, 

dissolved 

(mg/L)

<.01 

<.l

Date

Jul 1995 

13... 

13...

Silica, 

dissolved 

(mg/L)

87 

85

Aluminum, 

dissolved (ng/L)

320,000 

320,000

Arsenic, 

dissolved 

(ng/U

<5 

<5

Barium, 

dissolved (ng/L)

<10 

<10

Beryllium, 

dissolved

fog/U

21 

20

Boron, 

dissolved (ng/L)

270 

250

Cadmium, 

dissolved

(ng/D

63

67

Chromium, 

dissolved

<ng/D

170 

160

Cobalt, 

dissolved

(ng/D

950 

1,000

Copper, 

dissolved (ng/L)

150 

150

Date

Jul 1995 

13... 

13...

Iron, 

dissolved (ng/L)

560,000 

550,000

Lead, 

dissolved

(ng/D

<1

1

Lithium, 

dissolved (ng/L)

470 

470

Manganese, 

dissolved (ng/L)

1,000 

1,000

Molybdenum, 

dissolved

(ng/D

<1

1

Nickel, 

dissolved (ng/L)

2,100 

2,200

Silver, 

dissolved (ng/L)

10 

10

Strontium, 

dissolved

(ng/D

1,500 

1,500

Vanadium, 

dissolved (ng/L)

<60 

<60

Zinc, 

dissolved

(ng/D

7,700 

7,700

SITE 14, 472306111103601--MINE DRAIN TO MINING COULEE NEAR SAND COULEE, MT

Date

Feb 1995 

21... 

21...

Time

1410 

1415

Calcium, dissolved 

(mg/L)

270 

290

Magnesium, dissolved 

(mg/L)

190

200

Sodium, dissolved 

(mg/L)

19

20

Potassium, 

dissolved 

(mg/L)

0.2 

.2

Acidity 

(mg/L)

150 

150

Alkalinity, 

iab 

(mg/L as 

CaCOg)

e<l 

e<l

Sulfate, 

dissolved 

(mg/L)

11,000 

12,000

Chloride, 

dissolved 

(mg/L)

25 

<.l

Ruoride, 

dissolved 

(mg/L)

2.6 

2.6

Date

Feb 1995 

21... 

21...

Silica, 

dissolved 

(mg/L)

120 

130

Aluminum, 

dissolved (ng/L)

860,000 

870,000

Arsenic, 

dissolved 

(ng/D

<10 

<10

Barium, 

dissolved (ng/L)

<100 

<10

Beryllium, 

dissolved 

(ng/L)

95 

92

Boron, 

dissolved 

(MI/L)

720 

720

Cadmium, 

dissolved (ng/L)

83 

88

Chromium, 

dissolved (ng/L)

310 

320

Cobalt, 

dissolved

(ng/D

3,300 

3,400

Copper, 

dissolved

(ng/D

100 

<100

Date

Iron, Lead, Lithium, 

dissolved dissolved dissolved

(ng/L)

Nickel, Selenium, Silver, 

dissoived dissoived dissoived

(ng/D

®tron- VanadisSed 'W*

Feb 1995 

21... 

21...

950,000

1,000.000

1,200

1,200

3,200

3,400

<2 

2

7,300

7,500

<2 <4

1,200

320

330

33,000

32,000

TABLE 4 111
Table 4. Chemical analyses of field replicates for water samples from sites in the Sand Coulee Coal Area, Montana, July 1994 

through September 1996 (Continued)

SITE 21, 472309110551201-LEWIS COULEE BELOW MINE ADIT, AT BELT, MT

Date

May 1995 

17... 

17... 

Feb 1996 

21... 

21...

Time

0900 

0905

0945 

0950

Calcium, dissolved 

(mg/L)

62 

63

200 

200

Magnesium, dissolved 

(mg/L)

62 

63

130 

140

Sodium, dissolved 

(mg/L.)

19 

19

22 

23

Potassium, 

dissolved 

(mg/L.)

4.4 

4.3

5.8 

5.3

Acidity 

(mg/LJ

<0.1

<1

52 

52

Alkalinity, 

lab 

(mg/L as 

CaC03)

246 

246

e<l 

e<l

Sulfate, 

dissolved 

(mg/L)

180 

180

4,000 

3,900

Chloride, 

dissolved 

(mg/L)

14 

14

7.9 

8.3

Fluoride, 

dissolved 

(mg/L)

0.4 

.5

<1 

<1

Date

May 1995 

17... 

17... 

Feb 1996 

21... 

21...

Silica, 

dissolved 

(mg/L)

7.9 

8.1

75 

74

Aluminum, 

dissolved (ng/L.)

40 

40

280,000 

260,000

Arsenic, 

dissolved (ng/L.)

<1

<1

<2

<1

Barium, 

dissolved (ng/L)

75 

75

21 

12

Beryllium, 

dissolved (ng/L)

<0.5 

<5

25 

21

Boron, 

dissolved (ng/L)

40 

50

250 

260

Cadmium, 

dissolved (ng/L)

<1 

<1

15 

19

Chromium, 

dissolved

(ng/D

<5 

<5

50 

80

Cobalt, 

dissolved (ng/L)

20 

10

660 

830

Copper, 

dissolved (ng/L)

<10 

<10

<50 

<100

Date

Iron, 

dissolved (ng/L)

Lead, Lithium,

dissolved dissolved (ng/L)

Manga- Molyb- Stroni^iiwivct, 9Qid iiun i) 011 wi j til im

dissolved dissolved dissolved d^[J5Jtd

Vana- Zinc, 

dissolved

May 1995

17...

17... 

Feb 1996

21...

21...

5,500

5,700

560,000

550,000

54

54

440

420

56

57

1,500

1,500

30

30

1,600

1,600

<5

470

470

1,400

1,300

<6 

<6

59

76

46

54

5,600

5,300

112 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
Table 4. Chemical analyses of field replicates for water samples from sites in the Sand Coulee Coal Area, Montana, July 1994 

through September 1996 (Continued)

SITE 16,472313111104901-MINE DRAIN TO SAND COULEE NEAR SAND COULEE, MT

Date

Sep 1994 

06... 

06... 

Aug 1995 

16... 

16...

Time

1730 

1735

1520 

1525

Calcium, dissolved 

(mg/L)

160 

160

180 

170

Magnesium, dissolved 

(mg/L)

100 

100

110 

110

Sodium, dissolved 

(mg/L)

18 

18

20 

20

Potassium, 

dissolved 

(mg/L)

1.7 

1.8

2.0 

2.2

Acidity 

(mg/L)

42 

43

43 

42

Alkalinity, 

iab 

(mg/L as 

CsC03)

e<l 

e<l

e<l 

e<l

Sulfate, 

dissolved 

(mg/L)

3,200 

2,800

3,600 

3,300

Chloride, 

dissolved 

(mg/L)

15 

4.6

13 

12

Fluoride, 

dissolved 

(mg/L)

0.5 

.6

<.l

Date

Sep 1994 

06... 

06... 

Aug 1995 

16... 

16...

Silica, 

dissolved 

(mg/L)

66 

66

69 

69

Aluminum, 

dissolved (ug/L)

220,000 

220,000

250,000 

240,000

Arsenic, 

dissolved 

(ug/L)

4 

5

<5 

<5

Barium, 

dissolved 

(ug/L)

4 

4

8 

10

Beryllium, 

dissolved 

(ug/L)

28 

28

34 

36

Boron, 

dissolved 

(ug/L)

320 

310

360 

310

Csdmium, 

dissolved 

(ug/L)

39 

36

31 

32

Chromium, 

dissolved (ug/L)

80 

70

100 

90

Cobalt, 

dissolved 

(ug/L)

1,500 

1,500

uoo

1,200

Copper, 

dissolved 

(ug/L)

<30 

<30

<50 

<50

Iron, 

dissolved

Lead, 

issolvi 

(ug/L)

Lithium,. nin'nm Nlctal, Selenium, Silver, Stron- Vana-

__ T. J^_.._» niWIWJI, ^WWIIIUIII, OMWCI. *!..__ <4!i ln» Zinc, JSL. so* -ss?- -ssr "ssr -& -Sr ^>

Sep 1994

06...

06... 

Aug 1995

16...

16...

320,000

310,000

390,000

390,000

360

360

400

400

1,200

1,200

1,400

1,400

2,300

2,300

2,600

2,600

<5 

<5

<3 

<3

<5 

<5

990

990

1,100

1,100

150

150

110

110

10,000

10,000

11,000

11,000

TABLE 4 113
Table 4. Chemical analyses of field replicates for water samples from sites in the Sand Coulee Coal Area, Montana, July 1994 

through September 1996 (Continued)

SITE 17, 472330111082801 -CENTERVILLE WETLANDS INFLOW AT CENTERVILLE, MT

Date

Mar 1995 

15... 

15...

Time

1700 

1705

Calcium, dissolved 

<mg/L)

180 

190

Magnesium, dissolved 

(mg/L)

81 

84

Sodium, dissolved 

(mg/L)

14 

15

Potassium, 

dissolved 

(mg/L)

1.0 

1.1

Acidity 

(mg/L)

42 

42

Alkalinity, 

lab 

(mg/L as 

CaC03)

e<l 

e<l

Sulfate, 

dissolved 

(mg/L)

3,700 

4,300

Chloride, 

dissolved 

(mg/L)

3.2 

17

Fluoride, 

dissolved 

(mg/L)

0.8 

2.8

Date

Mar 1995 

15... 

15...

Silica, 

dissolved 

(mg/L)

87 

90

Aluminum, 

dissolved 

(M9/L)

220,000 

220,000

Arsenic, 

dissolved 

(MI/L)

<1 

<1

Barium, 

dissolved 

(M9/U

5 

6

Beryllium, 

dissolved 

(H9/L)

31 

32

Boron, 

dissolved 

(MP/L)

180 

180

Cadmium, 

dissolved 

(M9/L)

32 

30

Chromium, 

dissolved 

(M9/L)

<20 

20

Cobalt, 

dissolved 

(MP/L)

470 

410

Copper, 

dissolved 

(M9/D

110 

120

Date

Iron, Lead, Lithium,

(ng/L)

Nickel,

Jissolvec

(MJP/M

Selenium, Silver, Stron- VanaMar 1995 

15... 

15...

250,000

260,000

340

360

1,500

1,500

800

850

<3 

<3

910

940

17

23

2,400

2,500

114 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
Table 4. Chemical analyses of field replicates for water samples from sites in the Sand Coulee Coal Area, Montana, July 1994 

through September 1996 (Continued)

SITE 19,472334111104401-MOUNT OREGON MINE DRAIN TO KATE'S COULEE AT SAND COULEE, MT

Date

Aug 1994

17...

17...

Nov 1995

28...

28...

Aug 1996

07...

07...

Time

1115

1120

1100

1105

0810

0815

Calcium, dissolved 

<mg/L)

170

170

160

160

160

150

Magnesium, dissolved 

<mg/L)

130

130

130

130

120

120

Sodium, dissolved 

(mg/L)

24

24

24

24

22

24

Potassium, 

dissolved 

<mg/L)

5.2

5.3

4.2

4.6

4.8

4.7

Acidity 

(mg/L)

33

34

30

31

29

30

Alkalinity, 

lab 

(mg/L as 

CsC03)

e<l

e<l

e<l

e<l

e<l

e<l

Sulfate, 

dissolved 

(mg/L)

2,700

2,500

2,400

2,500

2,200

2,300

Chloride, 

dissolved 

(mg/L)

4.3

4.1

3.7

3.3

5.0

5.0

Fluoride, 

dissolved 

(mg/L)

0.1

<.l

1.4

1.5

2.5

2.7

Date

Aug 1994

17...

17...

Nov 1995

28...

28...

Aug 1996

07...

07...

Silica, 

dissolved 

(mg/L)

39

38

37

38

36

36

Aluminum, 

dissolved 

(WJ/I-)

170,000

170,000

180,000

160,000

150,000

150,000

Arsenic, 

dissolved (ng/i.)

14

14

11

10

9

14

Barium, 

dissolved 

(H9/I-)

14

13

27

27

26

27

Beryllium, 

dissolved 

(H9/I-)

26

20

23

23

23

25

Boron, 

dissolved 

(WJ/I-)

270

280

260

290

170

180

Cadmium, 

dissolved 

(H9/L)

29

32

8

8

8

8

Chromium, 

dissolved 

(Mfl/L)

30

40

20

30

30

40

Cobalt, 

dissolved 

(WJ/I-)

2,000

530

670

710

660

670

Copper, 

dissolved 

(H9/L)

<30

<30

<30

<30

<40

<40

Date

Iron,

dissolved 

(WJ/I-)

Lead, Lithium, _.__ "»r -w -St Molybdenum,

(WJ/L)

Nickel, Selenium, Silver, ftrondissolved dissolved dissolved - m>

(ug/L) (ng/L)

Vanadium, Zinc, 

dissolved

Aug 1994

17...

17... 

Nov 1995

28...

28... 

Aug 1996

07...

07...

330,000

320,000

290,000

290,000

280,000

280,000

440

440

430

430

390

410

1,300

1,300

1,200

1,200

1,200

1,100

10

9

10

9

1,600

1,500

1,500

1,500

1,400

1,400

<5

<5

<3 

<3

<3 

<3

<4 

<4

1,300

1,200

1,200

1,200

1,100

1,200

160

130

86

<24 

<24

6,400

5,800

5,900

5,800

5,800

5,800

TABLE 4 116
Table 4. Chemical analyses of field replicates for water samples from sites in the Sand Coulee Coal Area, Montana, July 1994 

through September 1996 (Continued)

SITE 20, 472346111102401-NELSON MINE DRAIN TO SAND COULEE AT SAND COULEE, MT

Date

Jan 1995 

11... 

11...

Time

1500 

1505

Calcium, dissolved 

(mg/L)

250 

250

Magnesium, dissolved 

(mg/L)

230 

230

Sodium, dissolved 

(mg/L)

16

17

Potassium, 

dissolved 

(mg/L)

0.9 

1.0

Acidity 

(mg/L)

170 

170

Alkalinity, 

lab 

(mg/L as 

CaCOa)

e<l 

e<l

Sulfate, 

dissolved 

(mg/L)

11,000 

11,000

Chloride, 

dissolved 

(mg/L)

38 

40

Fluoride, 

dissolved 

(mg/L)

7.3 

5.9

Date

Jan 1995 

11... 

11...

Silica, 

dissolved 

(mg/L)

59 

70

Aluminum, 

dissolved 

(H9/L)

920,000 

870,000

Arsenic, 

dissolved 

(H9/L)

63

58

Bsrium, 

dissolved 

(H9/L)

<100 

<100

Beryllium, 

dissolved 

(H9/L)

80 

80

Boron, 

dissolved 

(H9/L)

830 

880

Cadmium, 

dissolved 

(M9/L)

110 

110

Chromium, 

dissolved 

(H9/L)

320 

310

Cobalt, 

dissolved 

(H9/L)

2,200 

2,200

Copper, 

dissolved 

(H9/L)

300 

310

Date

Jan 1995 

11... 

11...

Iron, 

dissolved 

(H9/L)

1,400,000 

1,500,000

Lead, 

dissolved

:\

Lithium, 

dissolved 

(H9/L)

940 

900

Manganese,

SSL)

8,500 

8,500

Molybdenum, 

dissolved 

(H9/L)

3 

3

Nickel, 

dissolved 

(H9/L)

5,100 

5,200

Selenium, 

dissolved 

(H9/L)

<5

<2

Silver, 

dissolved 

(H9/L)

:;

Strontium,

SSL)

1,600 

1,600

Vanadium, 

dissolved

-

Zinc, 

dissolved 

(H9/L)

19,000 

19,000

SITE 22, 472446111085101-PIPE SPRING AT TRACY, MT

Date

Oct 1994 

14... 

14...

Time

0800 

0805

Calcium, dissolved 

(mg/L)

79 

80

Magnesium, dissolved 

(mg/L)

68 

67

Sodium, dissolved 

(mg/L)

21 

21

Potassium, 

dissolved 

(mg/L)

2.5 

2.4

Acidity 

(mg/L)

6.1 

6.6

Alkalinity, 

lab 

(mg/L as 

CaCOa)

e<l 

e<l

Sulfate, 

dissolved 

(mg/L)

910 

930

Chloride, 

dissolved 

(mg/L)

5.6 

5.8

Fluoride, 

dissolved 

(mg/L)

2.0 

2.0

Date

Oct 1994 

14... 

14...

Silica, 

dissolved 

(mg/L)

50 

50

Aluminum, 

dissolved 

(H9/L)

35,000 

36,000

Arsenic, 

dissolved 

(H9/L)

<1 

<1

Barium, 

dissolved 

(H9/L)

3 

3

Beryllium, 

dissolved 

(H9/L)

7 

7

Boron, 

dissolved 

(H9/L)

170 

180

Cadmium, 

dissolved 

(H9/L)

<l 

<l

Chromium, 

dissolved 

(H9/L)

<5 

<5

Cobalt, 

dissolved 

(H9/L)

200 

220

Copper, 

dissolved 

(WI/L)

20 

10

Date

Iron, Lesd, Lithium, Mangadlssolveti 

(M9VL)

Nickel, Selenium, 

SSL)

Silver, Stron- Vsna- Zinc,

Oct 1994 

14l 

14...

5,900

5.800

140

130

580

580

360

350

<2 

<2

600

590

<6 

<6

1,100

UOQ

116 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water In the Sand Coulee Coal 

Area, Montana
Table 4. Chemical analyses of field replicates for water samples from sites in the Sand Coulee Coal Area, Montana, July 1994 

through September 1996 (Continued)

SITE 23, 472447111085301-STOCK TANK SPRING AT TRACY, MT

Date

Dec 1994 

15... 

15...

Time

1405 

1410

Calcium, dissolved 

(mg/L)

65 

64

Magnesium, dissolved 

(mg/L)

58 

56

Sodium, dissolved 

(mg/L)

14 

14

Potassium, 

dissolved 

(mg/L)

2.0 

2.0

Acidity 

(mg/L)

0.2 

.1

Alkalinity, 

lab 

(mg/L as 

CaC03)

227 

226

Sulfate, 

dissolved 

(mg/L)

170 

170

Chloride, 

dissolved 

(mg/L)

6.1 

6.2

Ruoride, 

dissolved 

(mg/L)

1.0 

1.0

Date

Dec 1994 

15... 

15...

Silica, 

dissolved 

(mg/L)

10 

10

Aluminum, 

dissolved (Mg/L)

<10 

<10

Arsenic, 

dissolved

(Mg/U

<1 

<1

Barium, 

dissolved (ng/L)

46 

45

BerylHum, 

dissolved 

(M9/L)

<0.5 

<.5

Boron, 

dissolved 

(Mg/L)

80 

70

Cadmium, 

dissolved 

(M9/L)

<1 

<1

Chromium, 

dissolved 

(Mg/L)

<5

<5

Cobalt, 

dissolved (Mg/L)

<3 

3

Copper, 

dissolved 

(Mg/L)

<10 

<10

Iron, Lead, Lithium,

Date dissolved dissolved dissolved

Og/L) (ng/L) (ng/L) dissolved dissolved 

(Mg/L)

Nlckel' Selenium, Silver,

dissolved dissolved dissolved /,,_« > /,._ > /,._ > (Mg/L) (Mg/L) (Mg/L) dissolved dissolved 

(Mg/L)

Zinc,

dissolved /.._ > (Mg/L)

Dec 1994 

15... 

15...

<3 

5

35

35

20 

<10

490

480

<6 

<6

SITE 24, 472513111082501-JOHNSON BADWATER MINE SMALL WETLANDS INFLOW NEAR TRACY, MT

Date

Nov 1994 

15... 

15...

Time

1010 

1015

Calcium, dissolved 

(mg/L)

180 

180

Magnesium, dissolved 

(mg/L)

130 

140

Sodium, dissolved 

(mg/L)

25 

24

Potassium, 

dissolved 

(mg/L)

7.4 

7.5

Acidity 

(mg/L)

12 

12

Alkalinity, 

iab 

(mg/L as 

CaC03)

e<l

Sulfate, 

dissolved 

(mg/L)

1,800 

2,100

Chloride, 

dissolved 

(mg/L)

6.8

7.5

Fluoride, 

dissolved 

(mg/L)

6.3 

5.9

Date

Nov 1994 

15... 

15...

Silica, 

dissolved 

(mg/L)

48

47

Aluminum, 

dissolved 

(M9/L)

54,000 

55,000

Arsenic, 

dissolved 

(Mg/L)

<1 

<1

Barium, 

dissolved 

(Mg/L)

8 

8

Beryllium, 

dissolved 

(Mg/L)

25 

27

Boron, 

dissolved 

(Mg/L)

300 

300

Cadmium, 

dissolved 

(Mg/L)

9

7

Chromium, 

dissolved 

(Mg/L)

<20 

<20

Cobalt, 

dissolved 

(Mg/L)

790 

730

Copper, 

dissolved

(Mg/D

<30 

<30

Date

Iron, Lead, Lithium, Nlckel» Selenium, Silver, Zinc,

Nov 1994 

15... 

15...

130,000

140,000

390

390

1,000

990

1,100

1,100

<3 

<3 1,300

25

28

3,300

3,200

TABLE 4 117
Table 5. Chemical analyses of field blanks for water samples

[Abbreviations: lab, laboratory; Hg/L, micrograms per liter; uS/cm, microsiemens per centimeter at 25 °C; mg/L, milligrams per liter. Symbols: <, less than 

minimum reporting level; , no data]

Date

Jul 1994

20...

Aug

17...

Sep

07...

Oct

14...

Nov

15...

Dec

16...

Jan 1995

11...

Feb

21...

Mar

15...

Apr

12...

May

17...

Jun

13...

Jul

13...

Aug

16...

Sep

13...

Oct

10...

Nov

29...

Jan 1996

11...

Feb

21...

Apr

03...

Jun

04...

Jul

03...

Aug

06...

Sep

04...

Time

0945

1440

1040

1100

1220

1215

1410

1810

1325

1030

1415

1605

1100

1200

1110

1230

1500

1100

1430

0930

0900

1100

1800

1300

Specific conductance, 

onsfte 

(uS/cm)

2

1

1

2

3

2

2

2

1

2

2

2

2

2

2

1

2

2

2

2

1

1

2

2

PH, 

onsite (standard 

units)

6.8

6.8

6.0

6.0

7.1

5.6

5.8

5.8

5.5

5.3

6.1

7.3

5.5

6.0

5.9

5.9

5.8

5.7

6.6

5.2

6.3

6.5

5.8

5.5

Calcium, "HUT dis- J"1 '

 SSS solved 

t"1^ (mg/L)

<0.02 <0.01

.02 <.01

<.02 <.01

<.02 <.01

<.02 <.01

<.02 <.01

<.02 <.01

<.02 <.01

<.02 <.01

<.02 <.01

.02 <.01

<.02 <.01

<.02 <.01

<.02 <.01

.04 <.01

<.02 <.01

<.02 <.01

<.02 <.01

<.02 <.01

<.02 <.01

<.02 <.01

<.02 <.OI

<.02 <.01

<.02 <.01

Sodium, Potasdis- sium, 

solved dissolved 

(mg/L) (mg/L)

<0.20 <0.10

<.20 <.10

<.20 <.10

<.20 <. 1 0

<.20 <.10

<.20 <.10

<.20 <.10

<.20 <.10

<.20 <.10

<.20 <.10

<.20 <.10

<.20 <. 1 0

<.20 <.10

<.20 <.10

<.20 <.10

<.20 <.10

<.20 <.10

<.20 <.10

<.20 <.10

<.20 <.10

<.20 <.10

<.20 <.10

<.20 <.10

<.20 <.10

Alkalinity, 

Acidity lab 

(mg/L) (mg/L as 

CaCO3)

0.2 1.7

<.l 1.3

<.l 1.5

.1 1.6

<.l 2.0

.1 1.6

1

<.l 1.3

<.l 1.4

<.l 1.4

<.l 1.3

<.l 1.8

<.l

<.l 1.6

<.l

<.l 1.3

.3 <1.0

.1 1.6

.1 1.8

<.l 1.8

<.l <1.0

<.l 1.5

.2 1.6

<.l 1.3

Sulfate, Chloride, 

dissolved dissolved 

(mg/L) (mg/L)

<0.10 <0.10

<. 1 0 <. 1 0

2.4 <.10

<.10 <.10

.80 <.10

<.10 <.10

<.10 <.10

<.10 <.10

<.10 <.10

<.10 <.10

.10 <.10

<.10 <.10

7.2 <.10

<.10 <. 10

1.0 <.10

7.5 <.10

<.10 <.10

<.10 .04

<.10 <.10

<. 1 0 <. 1 0

<.10 <.10

<.10 <.10

<.10 <.10

<.10 <.10

118 Water-Quality Data (July 1994 through September 1996) and Statlatloal Summarfaa of Data for Surface Water In the Sand Coulee Coal 

Araa, Montana
Table 5. Chemical analyses of field blanks for water samples-Continued

Date

Jul 1994

20...

Aug 

17...

Sep 

07...

Oct

14...

Nov

15...

Dec

16...

Jan 1995

11...

Feb

21...

Mar

15...

Apr 

12...

May

17...

Jun

13...

Jul

13...

Aug 

16...

Sep 

13...

Oct

10...

Nov

29...

Jan 1996

11...

Feb

21...

Apr 

03...

Jun

04...

Jul

03...

Aug 

06...

Sep 

04...

Fluoride, Silica, 

dis- dissolved solved 

(mg/L) (mg/L)

<0.10 <0.01

<.10 <.01

<.10 .10

<.10 .05

<.10 .02

<.10 <.01

<.10 .05

<.10 .03

<.10 <.01

<.10 .02

.10 .04

<.10 14

<.10 21

<.10 3.2

<.10 8.0

<.10 <.01

<.10 .11

<.10 .02

<.10 .42

<.10 <.01

<.10 .06

<.10 .03

<.10 .01

<.10 .02

fn'S; Anjnte, Bajium, Bf

«nlv*ri »°lved 8°lved sol^d 

15$$ (M^ 0*8^ lfiS$

<10 <1 <2 <0.5

<10 <1 <2 <.5

<10 <1 <2 <.5

<10 <1 <2 <.5

<10 <1 <2 <5

<10 <1 <2 <.5

<10 <1 <2 <.5

<10 <1 <2 <.5

<10 <1 <2 <5

20 <1 <2 <.5

<10 <1 <2 <.5

<10 <1 <2 <.5

<10 <1 <2 <.5

<10 <1 <2 <.5

<1 <2 <.5

<10 <1 <2 <.5

<10 <1 <2 <.5

<10 <2 <2 <.5

<10 <1 <2 <.5

<10 <1 <2 <.5

<5 <1 <2 <.5

<5 <1 <2 <.5

<5 <1 <2 <.5

<5 <1 <2 <.5

R/trnn Cad' ChrO- H£ ml""", mlum> 

so^ed dls- dls" SoS? 80lved 80lved 

(ug/L) (uQ/L)

<10 <1 <5

<10 <1 <5

<10 <1 <5

<10 <1 <5

<10 <1 <5

<10 <1 <5

<10 <1 <5

<10 <1 <5

<10 <1 <5

<10 <1 <5

<10 <1 <5

<10 <1 <5

<10 <1 <5

<10 <1 <5

<10 3 <5

<10 <1 <5

<!0 1 <5

<10 <1 <5

<10 <1 <5

<10 <1 <5

<4 1 <5

5 <1 <5

<4 1 <5

<4 <1 <5

Cobalt, dissolved

<3

<3

<3

<3

<3

<3

<3

<1

4

<{

<3

<3

<3

<3

<3

<3

<3

<3

<3

<3

<3

<3

<3

<3

Copper, dissolved

<10

<10

<10

<10

<10

<10

<10

<10

<10

<10

<10

<10

<10

<10

<10

<10

<10

<10

<10

<10

<10

<10

<10

<10

TABLE 5 119
Table 5. Chemical analyses of field blanks for water samples-Continued

Date

Jul 1994

20...

Aug

17...

Sep 

07...

Oct

14...

Nov

15...

Dec

16...

Jan 1995

11...

Feb

21...

Mar

15...

Apr 

12...

May 

17...

Jun

13...

Jul

13...

Aug 

16...

Sep 

13...

Oct

10...

Nov

29...

Jan 1996

11...

Feb

21...

Apr 

03...

Jun

04...

Jul

03...

Aug 

06...

Sep 

04...

Iron, disaoived 

(H9/L)

<3

5

20

6

<3

<3

<3

7

<3

<3

4

5

8

<3

4

<3

<3

<3

<3

3

<3

<3

<3

<3

Lead, Lithium, ""Jf "ft* Nickel, ^^ SHjrcr, »g£

SS? (ug/L) SS? (ug/L) ^ ((ig/L) ~(wj/L) dk SS? (ug/L) di*» <$ d E5J (ug/L) &" (ug/L)

<10 <4 <1 <10 <10 <1 1 <1

<10 <4 <1 <10 <10 <5 <1 <1

<10 <4 <l <10 <10 <1 <1 <1

<10 <4 <1 <10 <10 <1 <1 <1

<10 <4 <1 <10 <10 <1 <1 <\

<10 <4 <1 <10 <10 <1 <1 <1

<10 <4 <1 <10 <10 <l <1 <1

<10 <4 <1 <10 <10 <1 <1 1

<10 <4 <1 <10 <10 <1 <1 <1

<10 <4 <1 <10 <10 <1 <1 <1

20 <4 <1 <10 <10 <1 <1 <1

<10 <4 <1 <10 <10 <1 <1 <1

<10 <4 <1 <10 <10 <1 <1 <1

<10 <4 <1 <10 <10 - 1 <1

10 <4 2 <10 <10 - 1 <1

30 <4 <1 <10 <10 - <1 <1

<10 <4 <1 <10 <10 <1 <1

<10 <4 <1 <10 <10 <1 <1

<10 <4 <1 <10 <10 <1 <1

<10 <4 <1 <10 <10 <1 <1

<10 <4 <1 <10 <10 <1 <1

<10 <4 <1 <10 <10 <1 <1

10 <4 <1 <10 <10 - 1 <1

<10 <4 <1 <10 <10 - <1 <1

Vanadium, dissolved 

(ug/L)

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

<6

Zinc, dissolved 

(ug/L)

<3

<3

<3

5

<3

<3

<3

4

<3

<3

4

<3

<3

<3

<3

7

4

<3

<3

<3

<3

<3

7

<3

120 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
Table 6. Statistical summary of water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 

through September 1996

[Site number shown in figure 2 or 3. Abbreviations: ftVs, cubic feet per second; °C, degrees Celsius; pg/L, micrograms per liter; |aS/cm, microsiemens 

per centimeter at 25 °C; mg/L, milligrams per liter. Symbols: <, less than minimum reporting level; , indicates insufficient data greater than minimum 

reporting level to compute statistic; e, estimated. Note: Multiple minimum reporting levels during the period of record may result in varying values 

identified with a less-than (<) symbol]

Property or constituent 

(reporting unit)

Number 

of 

samples

Maximum Minimum Mean Median

Site 1, 06078230-Sand Coulee Creek above Cottonwood Creek, at Centerville, Mont.

Streamflow, instantaneous (ft3/s)

Specific conductance, onsite (jiS/cm)

Temperature, water (°C)

pH, onsite (standard units)

Hardness, total (mg/L as CaCC^)

Calcium, dissolved (mg/L as Ca)

Magnesium, dissolved (mg/L as Mg)

Sodium, dissolved (mg/L as Na)

Potassium, dissolved (mg/L as K)

Acidity (mg/L as H+)

Alkalinity (mg/L as CaCO3 )

Sulfate, dissolved (mg/L as SO4)

Chloride, dissolved (mg/L as Cl)

Fluoride, dissolved (mg/L as Fl)

Silica, dissolved (mg/L as SiO2 )

Dissolved solids, calculated (mg/L)

Aluminum, dissolved (Hg/L as Al)

Arsenic, dissolved (Hg/L as As)

Barium, dissolved (jxg/L as Ba)

Beryllium, dissolved (Hg/L as Be)

Boron, dissolved (Hg/L as B)

Cadmium, dissolved (|ag/L as Cd)

Chromium, dissolved (|ag/L as Cr)

Cobalt, dissolved (ng/L as Co)

Copper, dissolved (ng/L as Cu)

Iron, dissolved (Hg/L as Fe)

Lead, dissolved (Hg/L as Pb)

Lithium, dissolved (Hg/L as Li)

Manganese, dissolved (jxg/L as Mn)

Molybdenum, dissolved (jxg/L as Mo)

Nickel, dissolved (Hg/L as Ni)

Selenium, dissolved (ng/L as Se)

Silver, dissolved (ng/L as Ag)

Strontium, dissolved (\ig/L as Sr)

Vanadium, dissolved (\ig/L as V)

Zinc, dissolved (Hg/L as Zn)

25

12

12

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

3

10

10

10

10

30

485

30.5

8.8

250

63

25

5.9

4.2

<.l

208

88

2.4

.6

11

284

430

2

210

.5

50

2

<5

<3

<10

240

10

12

23

10

20

<1

1

720

6

8

0.00

310

0.0

8.0

160

39

12

3.3

2.0

<.l

120

24

1.5

.2

3.2

184

20

<1

150

<.5

20

<1

<5

<3

<10

6

<10

4

3

<10

<10

<1

<1

300

<6

<3

4.7

396

15.8

8.4

208

50

20

4.8

2.7

-

162

54

2.0

.4

7.2

240

147

'1

167

-

32

-

-

-

--

69

-

8

9

-

-

-

-

557

--

>4

0.00

388

16.5

8.4

200

51

22

5.3

2.4

<.l

160

56

2.1

.3

7.7

240

95

1

160

<.5

30

<1

<5

<3

<10

58

<10

8

9

<10

<10

-

<1

635

<6

3

TABLE 6 121
Table 6. Statistical summary of water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 

through September 1996 (Continued)

Property or constituent 

(reporting unit)

Number 

of 

samples

Maximum Minimum Mean Median

Site 2, 06078250-Cottonwood Creek near Stockett, Mont.

Streamflow, instantaneous (ft3/s)

Specific conductance, onsite (jaS/cm)

Temperature, water (°C)

pH, onsite (standard units)

Hardness, total (mg/L as CaCQ$)

Calcium, dissolved (mg/L as Ca)

Magnesium, dissolved (mg/L as Mg)

Sodium, dissolved (mg/L as Na)

Potassium, dissolved (mg/L as K)

Acidity (mg/L as H+)

Alkalinity (mg/L and CaCO3 )

Sulfate, dissolved (mg/L as 864)

Chloride, dissolved (mg/L as Cl)

Fluoride, dissolved (mg/L as F)

Silica, dissolved (mg/L as SiO2 )

Dissolved solids, calculated (mg/L)

Aluminum, dissolved (|xg/L as Al)

Arsenic, dissolved (jag/L as As)

Barium, dissolved (ng/L as Ba)

Beryllium, dissolved (\ig/L as Be)

Boron, dissolved (|ig/L as B)

Cadmium, dissolved (|4g/L as Cd)

Chromium, dissolved (|ig/L as Cr)

Cobalt, dissolved (|ig/L as Co)

Copper, dissolved (|4g/L as Cu)

Iron, dissolved ()Jg/L as Fe)

Lead, dissolved (ng/L as Pb)

Lithium, dissolved (|4g/L as Li)

Manganese, dissolved (|ig/L as Mn)

Molybdenum, dissolved (|4g/L as Mo)

Nickel, dissolved (jag/L as Ni)

Selenium, dissolved (|Xg/L as Se)

Silver, dissolved (|ig/L as Ag)

Strontium, dissolved (Mg/L as Sr)

Vanadium, dissolved (|ig/L as V)

Zinc, dissolved (|4g/L as Zn)

26

13

14

11

11

11

11

11

11

11

11

11

11

11

11

11

11

11

11

11

11

11

11

9

11

11

11

11

11

11

11

4

11

11

11

11

17

1,360

28.0

8.3

700

160

73

13

5

7.7

229

950

5.6

1.7

17

el, 180

54,000

3

220

12

120

11

<5

560

50

7,400

<10

110

430

<10

1,000

<1

1

480

<6

4,800

0.00

656

0.0

4.0

320

71

34

10

3.4

<.l

e<l

97

4.0

.3

2.6

366

<10

<1

24

<.5

50

<1

<5

6

<10

<3

<10

16

25

<10

20

<1

<1

300

<6

7

1.6

1,020

15.0

6.7

504

108

57

12

4.1

'2.0

114

485

4.6

.8

8.1

762

'9,380

--

127

--

83

>3

--

122

--

'1,510

--

57

208

--

338

--

--

408

-

1,250

0.09

1,000

15.5

7.5

510

110

57

12

4

.1

153

370

4.6

.7

6.4

683

210

<1

130

<5

80

2

<5

50

<10

6

<10

46

150

<10

120

-

<1

440

<6

68

122 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
Table 6. Statistical summary of water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 

through September 1996 (Continued)

Property or constituent 

(reporting unit)

Number 

of 

samples

Maximum Minimum Mean Median

Site 3, 06078260-Number Five Coulee below G Iff en Spring, near Stockett, Mont.

Streamflow, instantaneous (ftVs)

Specific conductance, onsite (^iS/cm)

Temperature, water (°C)

pH, onsite (standard units)

Hardness, total (mg/L as CaCO3)

Calcium, dissolved (mg/L as Ca)

Magnesium, dissolved (mg/L as Mg)

Sodium, dissolved (mg/L as Na)

Potassium, dissolved (mg/L as K.)

Acidity (mg/L as H*)

Alkalinity (mg/L and CaCO3)

Sulfate, dissolved (mg/L as SO4)

Chloride, dissolved (mg/L as Cl)

Fluoride, dissolved (mg/L as F)

Silica, dissolved (mg/L as SiO2)

Dissolved solids, calculated (mg/L)

Aluminum, dissolved (Hg/L as Al)

Arsenic, dissolved (u.g/L as As)

Barium, dissolved (|ig/L as Ba)

Beryllium, dissolved (u.g/L as Be)

Boron, dissolved (ng/L as B)

Cadmium, dissolved (|ig/L as Cd)

Chromium, dissolved (|ig/L as Cr)

Cobalt, dissolved (|ig/L as Co)

Copper, dissolved (|ig/L as Cu)

Iron, dissolved (fig/L as Fe)

Lead, dissolved (|ig/L as Pb)

Lithium, dissolved (|ig/L as Li)

Manganese, dissolved (Hg/L as Mn)

Molybdenum, dissolved (jig/L as Mo)

Nickel, dissolved (|ig/L as Ni)

Selenium, dissolved (|ig/L as Se)

Silver, dissolved (u,g/L as Ag)

Strontium, dissolved (u,g/L as Sr)

Vanadium, dissolved (u,g/L as V)

Zinc, dissolved Qig/L as Zn)

29

29

29

25

25

25

25

25

25

25

25

25

25

24

25

25

25

25

25

25

25

25

25

25

25

25

25

25

25

25

25

11

25

25

25

25

8.3

1,250

18.0

7.9

600

160

49

20

7.0

3.2

257

790

7.3

1.3

17

el, 110

400

<2

210

1

100

14

<5

410

<10

63,000

<10

69

1,300

1

470

1

2

430

12

1,900

0.60

714

4.5

6.0

330

74

36

14

4.1

<.l

e<l

110

3.3

.2

8.3

415

20

<1

22

<.5

50

<1

<5

10

<10

340

<1

11

130

<1

30

<1

<1

290

<6

30

2.0

1,060

10.0

6.5

516

134

44

16

5.6

! .9

44.1

572

4.4

.6

13

854

123

-

56

! .8

77

! 4

--

194

-

37,200

--

57

795

-

285

-

-

368

1 6

1,040

0.87

1,150

9.5

6.5

530

140

45

16

5.7

.6

e<l

630

4.3

.6

14

e919

70

<1

35

.6

80

3

<5

190

<10

44,000

<1

62

830

<1

310

<1

<1

380

<6

1,100

TABLE 6 123
Table 6. Statistical summary of water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 

through September 1996 (Continued)

Property or constituent 

(reporting unit)

Number 

of 

samples

Maximum Minimum Mean Median

Site 4, 06078270-Sand Coulee at Sand Coulee, Mont.

Streamflow, instantaneous (frVs)

Specific conductance, onsite (|aS/cm)

Temperature, water (°C)

pH, onsite (standard units)

Hardness, total (mg/L as CaCO3 )

Calcium, dissolved (mg/L as Ca)

Magnesium, dissolved (mg/L as Mg)

Sodium, dissolved (mg/L as Na)

Potassium, dissolved (mg/L as K.)

Acidity (mg/L as H*)

Alkalinity (mg/L as CaCO3 )

Sulfate, dissolved (mg/L as SO4)

Chloride, dissolved (mg/L as Cl)

Fluoride, dissolved (mg/L as F)

Silica, dissolved (mg/L as SiO2 )

Dissolved solids, calculated (mg/L)

Aluminum, dissolved (Mg/L as Al)

Arsenic, dissolved (Mg/L as As)

Barium, dissolved (Mg/L as Ba)

Beryllium, dissolved (Mg/L as Be)

Boron, dissolved (Mg/L as B)

Cadmium, dissolved (Mg/L as Cd)

Chromium, dissolved (Mg/L as Cr)

Cobalt, dissolved (Mg/L as Co)

Copper, dissolved (Mg/L as Cu)

Iron, dissolved (Mg/L as Fe)

Lead, dissolved (Mg/L as Pb)

Lithium, dissolved (Mg/L as Li)

Manganese, dissolved (Mg/L as Mn)

Molybdenum, dissolved (Mg/L as Mo)

Nickel, dissolved (Mg/L as Ni)

Selenium, dissolved (Mg/L as Se)

Silver, dissolved (Mg/L as Ag)

Strontium, dissolved (Mg/L as Sr)

Vanadium, dissolved (Mg/L as V)

Zinc, dissolved (Mg/L as Zn)

26

15

15

13

13

13

13

13

13

13

13

13

13

12

13

13

13

13

13

13

13

11

13

13

12

13

13

13

13

13

13

7

13

13

13

13

2.5

5,460

30.0

6.1

1,400

250

180

26

7.1

84

e<l

6,800

21

2.4

86

e8,290

490,000

11

120

60

490

49

160

3,000

160

600,000

2

700

4,900

2

3,400

1

<10

1,400

130

14,000

0.00

1,020

3.0

2.2

480

86

65

16

2.2

<.l

e<l

470

3.1

<.l

9.9

e683

30

<1

<10

<.5

80

2

<5

110

<10

7,700

<1

85

450

<1

240

<1

<1

530

<6

420

0.25

3,630

16.2

3.1

1,040

193

136

22

3.2

'50

-

4,020

8.2

'i.o

61

e5,080

301,000

'4.3

'39

'38

322

26

'87

1,410

'91

312,000

-

470

3,240

-

2,180

-

~

1,090

'65

8,720

0.02

3,930

17.0

2.7

1,200

220

160

23

2.9

38

e<l

4,500

7.7

.7

77

e5,810

410,000

4

11

49

420

21

110

1,400

110

360,000

<1

610

4,000

<1

2,800

<2

<3

1,200

57

11,000

124 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
Table 6. Statistical summary of water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 

through September 1996 (Continued)

Property or constituent 

(reporting unit)

Number 

of 

samples

Maximum Minimum Mean Median

Site 5, 06090590-Anaconda drain at Belt, Mont.

Streamflow, instantaneous (ft3/s)

Specific conductance, onsite (MS/cm)

Temperature, water (°C)

pH, onsite (standard units)

Hardness, total (mg/L as CaCO3)

Calcium, dissolved (mg/L as Ca)

Magnesium, dissolved (mg/L as Mg)

Sodium, dissolved (mg/L as Na)

Potassium, dissolved (mg/L as K)

Acidity (mg/L as H+)

Alkalinity (mg/L as CaCO3 )

Sulfate, dissolved (mg/L as SO4)

Chloride, dissolved (mg/L as Cl)

Fluoride, dissolved (mg/L as F)

Silica, dissolved (mg/L as SiO2)

Dissolved solids, calculated (mg/L)

Aluminum, dissolved (Mg/L as Al)

Arsenic, dissolved (Mg/L as As)

Barium, dissolved (Mg/L as Ba)

Beryllium, dissolved (Mg/L as Be)

Boron, dissolved (Mg/L as B)

Cadmium, dissolved (Mg/L as Cd)

Chromium, dissolved (Mg/L as Cr)

Cobalt, dissolved (Mg/L as Co)

Copper, dissolved (Mg/L as Cu)

Iron, dissolved (Mg/L as Fe)

Lead, dissolved (Mg/L as Pb)

Lithium, dissolved (Mg/L as Li)

Manganese, dissolved (Mg/L as Mn)

Molybdenum, dissolved (Mg/L as Mo)

Nickel, dissolved (Mg/L as Ni)

Selenium, dissolved (Mg/L as Se)

Silver, dissolved (Mg/L as Ag)

Strontium, dissolved (Mg/L as Sr)

Vanadium, dissolved (Mg/L as V)

Zinc, dissolved (Mg/L as Zn)

25

26

26

25

25

25

25

25

25

25

25

25

25

23

25

25

25

25

25

25

25

20

25

21

25

25

25

25

25

25

25

12

25

25

25

25

0.29

2,460

18.5

3.0

720

170

72

11

3.7

25

e<l

2,700

7.9

2.7

60

e3,290

120,000

3

12

23

320

13

50

500

40

190,000

2

210

450

1

850

<5

5

1,700

25

3,800

0.15

2,280

6.5

2.8

610

140

63

9.4

2.5

18

e<l

1,700

2.2

.6

51

e2,240

92,000

<1

<2

15

60

7

30

280

<30

150,000

<1

170

380

<1

700

<1

<2

1,400

<18

3,100

0.22

2,380

12.3

2.9

669

157

67

9.9

3.0

21

-

1,960

4.5

1.6

57

e2,540

106,000

l l

'6

18

154

9

43

347

1 27

169,000

'1

194

418

--

785

-

--

1,540

! 21

3,450

0.22

2,380

12.5

2.9

670

160

67

10

3.0

21

e<l

1,900

4.5

1.7

57

e2,490

110,000

1

3

17

150

8

40

330

<30

170,000

<30

200

420

<1

790

<1

<3

1,600

<60

3,500

TABLE 6 125
Table 6. Statistical summary of water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 

through September 1996 (Continued)

Property or constituent 

(reporting unit)

Number 

of 

samples

Maximum Minimum Mean Median

Site 6, 471851111111101-Glffen Spring near Stockctt, Mont.

Streamflow, instantaneous (ft^s)

Specific conductance, onsite (MS/cm)

Temperature, water (°C)

pH, onsite (standard units)

Hardness, total (mg/L as CaCO3)

Calcium, dissolved (mg/L as Ca)

Magnesium, dissolved (mg/L as Mg)

Sodium, dissolved (mg/L as Na)

Potassium, dissolved (mg/L as K.)

Acidity (mg/L as H4")

Alkalinity (mg/L as CaCO3)

Sulfate, dissolved (mg/L as 864)

Chloride, dissolved (mg/L as Cl)

Fluoride, dissolved (mg/L as F)

Silica, dissolved (mg/L as SiO2)

Dissolved solids, calculated (mg/L)

Aluminum, dissolved (Mg/L as Al)

Arsenic, dissolved (Mg/L as As)

Barium, dissolved (Mg/L as Ba)

Beryllium, dissolved (Mg/L as Be)

Boron, dissolved (Mg/L as B)

Cadmium, dissolved (Mg/L as Cd)

Chromium, dissolved (Mg/L as Cr)

Cobalt, dissolved (Mg/L as Co)

Copper, dissolved (Mg/L as Cu)

Iron, dissolved (Mg/L as Fe)

Lead, dissolved (Mg/L as Pb)

Lithium, dissolved (Mg/L as Li)

Manganese, dissolved (Mg/L as Mn)

Molybdenum, dissolved (Mg/L as Mo)

Nickel, dissolved (Mg/L as Ni)

Selenium, dissolved (Mg/L as Se)

Silver, dissolved (Mg/L as Ag)

Strontium, dissolved (Mg/L as Sr)

Vanadium, dissolved (Mg/L as V)

Zinc, dissolved (Mg/L as Zn)

25

25

25

25

25

25

25

25

25

25

25

25

25

24

25

25

25

25

25

25

24

25

25

25

25

25

25

25

25

25

25

12

25

25

25

25

0.55

1,400

11.0

5.8

480

120

44

17

6.3

9.5

e<l

1,000

6.1

1.5

25

el, 300

35,000

1

40

11

120

18

7

510

80

110,000

<10

86

510

2

570

<5

2

380

8

2,500

0.38

982

8.5

3.7

440

110

39

11

4.4

.6

e<l

480

2.7

.2

16

e715

1,100

<1

23

2

50

1

<5

110

<10

40,000

<1

60

320

<1

230

<1

<1

310

<6

830

0.49

1,160

9.2

4.9

459

115

42

14

5.3

4.3

-

729

3.9

.9

19.8

el ,020

11,800

-

28

5

86

7

'4

250

>17

72,200

-

73

384

-

369

-

-

352

-

1,480

0.50

1,130

9.0

5.0

460

110

42

14

5.4

4.5

e<l

740

3.7

.9

19

el,020

6,900

<l

26

5

85

8

<5

250

<10

71,000

<1

73

370

<1

340

<1

<1

350

<6

1,400

126 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water In the Sand Coulee Coal 

Area, Montana
Table 6. Statistical summary of water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 

through September 1996 (Continued)

Property or constituent 

(reporting unit)

Number 

of 

samples

Maximum Minimum Mean Median

Site 7, 47201 6111 085701 -Cottonwood Mine No. 6 drain to Cottonwood Creek near Stockett, Mont.

Streamflow, instantaneous (fVVs)

Specific conductance, onsite (jaS/cm)

Temperature, water (°C)

pH, onsite (standard units)

Hardness, total (mg/L as CaCO3)

Calcium, dissolved (mg/L as Ca)

Magnesium, dissolved (mg/L as Mg)

Sodium, dissolved (mg/L as Na)

Potassium, dissolved (mg/L as K)

Acidity (mg/L as H+)

Alkalinity (mg/L as CaCO3 )

Sulfate, dissolved (mg/L as SO4)

Chloride, dissolved (mg/L as Cl)

Fluoride, dissolved (mg/L as F)

Silica, dissolved (mg/L as SiO2)

Dissolved solids, calculated (mg/L)

Aluminum, dissolved (|Jg/L as Al)

Arsenic, dissolved (|Jg/L as As)

Barium, dissolved (jag/L as Ba)

Beryllium, dissolved (|ig/L as Be)

Boron, dissolved (|Jg/L as B)

Cadmium, dissolved (|Jg/L as Cd)

Chromium, dissolved (|ag/L as Cr)

Cobalt, dissolved (|og/L as Co)

Copper, dissolved (|Jg/L as Cu)

Iron, dissolved (ng/L as Fe)

Lead, dissolved (|ag/L as Pb)

Lithium, dissolved (|Jg/L as Li)

Manganese, dissolved (pg/L as Mn)

Molybdenum, dissolved (|ag/L as Mo)

Nickel, dissolved (|ag/L as Ni)

Selenium, dissolved (jag/L as Se)

Silver, dissolved (|Jg/L as Ag)

Strontium, dissolved (ng/L as Sr)

Vanadium, dissolved (|Jg/L as V)

Zinc, dissolved (|ig/L as Zn)

18

18

18

18

18

18

18

18

18

18

18

18

18

15

18

18

18

18

11

18

15

18

18

17

18

18

18

18

18

18

18

5

18

18

18

18

0.15

6,020

11.5

2.8

1,500

380

140

15

5.7

87

e<l

7,200

20

5.6

100

e9,140

450,000

<25

130

130

570

110

80

9,700

210

840,000

<4

730

2,500

5

12,000

4

11

1,500

240

56,000

0.02

5,570

6.0

2.5

1,300

330

120

13

.5

74

e<l

5,400

<1

<1

83

e6,530

350,000

<1

100

94

470

72

<50

3,900

<100

660,000

<1

550

2,100

<1

9,700

<1

<3

1,100

<60

44,000

0.05

5,788

9.6

2.6

1,420

348

133

14

2.7

82

--

6,040

'6.7

'2.5

93

e7,810

401,000

--

116

116

509

84

1 49

6,220

! 113

774,000

-

652

2,350

2

10,800

-

--

1,240

'138

50,500

0.03

5,790

10.0

2.6

1,400

350

130

14

2.5

83

e<l

5,850

3.6

2.8

95

e7,700

405,000

<5

120

120

510

80

<80

6,200

100

785,000

<1

665

2,350

1

11,000

--

<10

1,200

140

51,000

TABLE 6 127
Table 6. Statistical summary of water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 

through September 1996 (Continued)

Property or constituent 

(reporting unit)

Number 

of 

samples

Maximum Minimum Mean Median

Site 8, 4721 141 11 095001 -Cottonwood Mine No. 2 drain to Ladd Coulee at Stockett, Mont.

Streamflow, instantaneous (ftVs)

Specific conductance, onsite (fAS/cm)

Temperature, water (°C)

pH, onsite (standard units)

Hardness, total (mg/L as CaCO3 )

Calcium, dissolved (mg/L as Ca)

Magnesium, dissolved (mg/L as Mg)

Sodium, dissolved (mg/L as Na)

Potassium, dissolved (mg/L as K)

Acidity (mg/L as H4")

Alkalinity (mg/L as CaCO3 )

Sulfate, dissolved (mg/L as SO4)

Fluoride, dissolved (mg/L as F)

Silica, dissolved (mg/L as SiO2)

Dissolved solids, calculated (mg/L)

Aluminum, dissolved (fAg/L as Al)

Arsenic, dissolved (Mg/L as As)

Barium, dissolved (Mg/L as Ba)

Beryllium, dissolved (fig/L as Be)

Boron, dissolved (fAg/L as B)

Cadmium, dissolved (fAg/L as Cd)

Chromium, dissolved (fAg/L as Cr)

Cobalt, dissolved (fAg/L as Co)

Copper, dissolved (fAg/L as Cu)

Iron, dissolved (fAg/L as Fe)

Lead, dissolved (fAg/L as Pb)

Lithium, dissolved (fAg/L as Li)

Manganese, dissolved (fAg/L as Mn)

Molybdenum, dissolved (fAg/L as Mo)

Nickel, dissolved (fAg/L as Ni)

Selenium, dissolved (fAg/L as Se)

Silver, dissolved (fAg/L as Ag)

Strontium, dissolved (fAg/L as Sr)

Vanadium, dissolved (fAg/L as V)

Zinc, dissolved (fAg/L as Zn)

24

25

25

25

25

25

25

25

24

25

25

25

20

25

25

25

25

25

25

23

24

25

24

25

25

24

25

24

24

23

12

25

25

19

25

0.10

10,800

26.0

2.8

3,100

520

430

12

5.7

270

e<l

16,000

8.5

140

e20,700

1,600,000

11

200

300

1,000

510

270

11,000

820

2,000,000

1

2,000

17,000

6

17,000

4

<40

2,500

230

87,000

0.001

6,470

0.0

2.2

1,600

320

200

4.7

.3

100

e<l

8,600

<1

38

el 0,800

740,000

<1

<200

110

390

160

<100

4,900

200

720,000

<1

1,100

5,400

<1

8,500

<1

<1

1,200

<6

42,000

0.02

8,920

11.7

2.5

2,300

425

300

8.8

2.2

200

--

13,100

'3.0

97

e!6,600

1,180,000

'2

'150

176

727

306

'129

8,050

450

1,380,000

-

1,540

8,480

l l

12,600

--

--

1,800

--

63,200

0.01

8,750

11.0

2.5

2,300

430

310

8.9

1.8

210

e<l

14,000

2.0

100

el 7,400

1,200,000

<5

<200

170

760

310

110

8,000

420

1,400,000

<1

1,500

7,900

<2

13,000

<5

<10

1,900

<120

62,000

128 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
Table 6. Statistical summary of water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 

through September 1996 (Continued)

Property or constituent 

(reporting unit)

Number 

of 

samples

Maximum Minimum Mean Median

Site 9, 472212111093301-Number Five Coulee near Stockett, Mont.

Streamflow, instantaneous (ft3/s)

Specific conductance, onsite (|iS/cm)

Temperature, water (°C)

pH, onsite (standard units)

Hardness, total (mg/L as CaCO3 )

Calcium, dissolved (mg/L as Ca)

Magnesium, dissolved (mg/L as Mg)

Sodium, dissolved (mg/L as Na)

Potassium, dissolved (mg/L as K)

Acidity (mg/L as H+)

Alkalinity (mg/L as CaCO3 )

Sulfate, dissolved (mg/L as SO4)

Chloride, dissolved (mg/L as Cl)

Fluoride, dissolved (mg/L as F)

Silica, dissolved (mg/L as SiO2)

Dissolved solids, calculated (mg/L)

Aluminum, dissolved (|Jg/L as Al)

Arsenic, dissolved (|Jg/L as As)

Barium, dissolved (|Jg/L as Ba)

Beryllium, dissolved (ng/L as Be)

Boron, dissolved (ng/L as B)

Cadmium, dissolved (ng/L as Cd)

Chromium, dissolved (ng/L as Cr)

Cobalt, dissolved (|Jg/L as Co)

Copper, dissolved (ng/L as Cu)

Iron, dissolved (|Jg/L as Fe)

Lead, dissolved (|Jg/L as Pb)

Lithium, dissolved (|Jg/L as Li)

Manganese, dissolved (ng/L as Mn)

Molybdenum, dissolved (ng/L as Mo)

Nickel, dissolved (ug/L as Ni)

Selenium, dissolved (|ig/L as Se)

Silver, dissolved (|Jg/L as Ag)

Strontium, dissolved (|Jg/L as Sr)

Vanadium, dissolved (ng/L as V)

Zinc, dissolved (ug/L as Zn)

23

14

14

14

14

14

14

14

14

14

14

14

14

14

14

14

14

14

14

14

14

14

14

12

14

14

14

14

14

14

14

5

14

14

14

14

9.5

1,160

29.0

8.4

620

170

50

25

6.9

1.5

259

750

5.7

1

12

1,030

1,700

<2

160

.9

100

9

7

210

<10

27,000

10

66

1,500

<10

450

1

2

410

<6

1,900

0.00

645

0.0

5.1

300

61

34

11

4.1

<.l

1

77

3.1

.4

1.4

371

30

<1

32

<.5

40

<1

<5

<3

<10

<3

<1

16

9

<1

<10

<1

<1

250

<6

<3

1.2

932

12.2

7.1

468

117

42

19

5.4

'.2

74

432

4.4

.6

6.7

678

264

-

84

-

69

'2

-

'74

--

'3,250

-

47.8

536

-

'162

--

--

334

-

J442

0.02

981

14.8

7.2

480

125

44

20

5.4

<.l

30

495

4.4

.6

6.7

715

105

<1

75

<.5

75

<1

<5

30

<10

43

<10

51.5

420

<10

130

--

<1

345

<6

66

TABLE 6 129
Table 6. Statistical summary of water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 

through September 1996 (Continued)

Property or constituent 

(reporting unit)

Number 

of 

samples

Maximum Minimum Mean Median

Site 10, 4722331 10552601 -French Coulee wetlands outflow at Belt, Mont.

Streamflow, instantaneous (ft3/s)

Specific conductance, onsite (MS/cm)

Temperature, water (°C)

pH, onsite (standard units)

Hardness, total (mg/L as CaCO3)

Calcium, dissolved (mg/L as Ca)

Magnesium, dissolved (mg/L as Mg)

Sodium, dissolved (mg/L as Na)

Potassium, dissolved (mg/L as K)

Acidity (mg/L as H*)

Alkalinity (mg/L as CaCO3 )

Sulfate, dissolved (mg/L as SO4)

Chloride, dissolved (mg/L as Cl)

Fluoride, dissolved (mg/L as F)

Silica, dissolved (mg/L as SiO2)

Dissolved solids, calculated (mg/L)

Aluminum, dissolved (Mg/L as Al)

Arsenic, dissolved (Mg/L as As)

Barium, dissolved (Mg/L as Ba)

Beryllium, dissolved (Mg/L as Be)

Boron, dissolved (Mg/L as B)

Cadmium, dissolved (Mg/L as Cd)

Chromium, dissolved (Mg/L as Cr)

Cobalt, dissolved (Mg/L as Co)

Copper, dissolved (Mg/L as Cu)

Iron, dissolved (Mg/L as Fe)

Lead, dissolved (Mg/L as Pb)

Lithium, dissolved (Mg/L as Li)

Manganese, dissolved (Mg/L as Mn)

Molybdenum, dissolved (Mg/L as Mo)

Nickel, dissolved (Mg/L as Ni)

Selenium, dissolved (Mg/L as Se)

Silver, dissolved (Mg/L as Ag)

Strontium, dissolved (Mg/L as Sr)

Vanadium, dissolved (Mg/L as V)

Zinc, dissolved (Mg/L as Zn)

24

20

20

20

20

20

20

20

20

20

20

20

20

18

20

20

20

20

20

20

20

20

20

15

20

19

20

20

20

20

20

12

20

20

18

17

0.09

6,180

20.0

3.9

2,000

490

210

44

33

90

e<l

6,800

29

4.5

130

e8,950

570,000

<2

21

62

510

9

110

420

140

770,000

6

750

6,400

<10

1,100

<10

18

2,900

40

7,400

O.001

2,880

0.0

2.5

810

200

75

12

3

23

e<l

2,200

7.8

<1

55

e2,870

100,000

<1

<10

15

150

<5

<50

90

<30

170,000

<1

200

790

<1

230

<1

<1

1,100

<12

810

0.03

4,601

8.0

3.0

1,342

324

128

23

12

64

--

5,005

18

'2.0

92.4

e6,360

371,000

--

'12.4

40

283

U

'58

261

'41

471,000

'2

476

2,770

--

671

--

--

2,010

-

3,020

0.02

4,630

7.2

2.8

1,300

315

110

19

8.4

66

e<l

5,450

17

1.6

90

e6,800

375,000

<1

12

40

255

3

45

260

<100

500,000

<10

455

2,200

<1

695

<1

<5

1,950

<60

2,400

130 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
Table 6. Statistical summary of water-quality data for sites in the Sand Coulee Coal Area, Montana, July 

through September 1996 (Continued)

1994

Property or constituent 

(reporting unit)

Number 

of 

samples

Maximum Minimum Mean Median

Site 11, 472235110553201-French Coulee wetlands inflow at Belt, Mont.

Streamflow, instantaneous (ft3/s)

Specific conductance, onsite (|aS/cm)

Temperature, water (°C)

pH, onsite (standard units)

Hardness, total (mg/L as CaCO3)

Calcium, dissolved (mg/L as Ca)

Magnesium, dissolved (mg/L as Mg)

Sodium, dissolved (mg/L as Na)

Potassium, dissolved (mg/L as K)

Acidity (mg/L as H+)

Alkalinity (mg/L as CaCO3)

Sulfate, dissolved (mg/L as SO4)

Chloride, dissolved (mg/L as Cl)

Fluoride, dissolved (mg/L as F)

Silica, dissolved (mg/L as SiO2)

Dissolved solids, calculated (mg/L)

Aluminum, dissolved (Mg/L as Al)

Arsenic, dissolved (Mg/L as As)

Barium, dissolved (Mg/L as Ba)

Beryllium, dissolved (Mg/L as Be)

Boron, dissolved (Mg/L as B)

Cadmium, dissolved (Mg/L as Cd)

Chromium, dissolved (|ig/L as Cr)

Cobalt, dissolved (Mg/L as Co)

Copper, dissolved (Mg/L as Cu)

Iron, dissolved (Mg/L as Fe)

Lead, dissolved (Mg/L as Pb)

Lithium, dissolved (Mg/L as Li)

Manganese, dissolved (Mg/L as Mn)

Molybdenum, dissolved (Mg/L as Mo)

Nickel, dissolved (Mg/L as Ni)

Selenium, dissolved (Mg/L as Se)

Silver, dissolved (Mg/L as Ag)

Strontium, dissolved (Mg/L as Sr)

Vanadium, dissolved (Mg/L as V)

Zinc, dissolved (Mg/L as Zn)

19

19

18

19

19

19

19

19

19

19

19

19

19

17

19

19

19

19

19

19

19

15

19

12

19

18

19

19

19

19

19

12

19

19

19

19

0.12

6,550

12.5

2.9

1,100

250

120

17

5.9

120

e<l

7,400

38

3.6

120

e9,860

640,000

39

17

64

470

11

210

440

60

1,300,000

3

670

1,100

<10

1,300

2

7

2,400

290

5,800

0.02

2,300

7.5

2.5

550

110

66

11

2.8

22

e<l

2,000

4.5

<1

41

e2,530

100,000

2

<3

12

90

<1

30

100

<30

170,000

<1

170

200

<1

230

<1

<3

890

<18

1,200

0.05

4,730

10.1

2.7

901

199

96

14

4.6

73

-

4,950

15

M.3

87

e6,360

366,000

19

'6

40

318

'7

136

253

>42

709,000

1 2

454

673

-

789

-

-

1,820

1 127

3,730

0.04

5,620

10.0

2.7

1,000

230

100

13

5.2

91

e<l

6,000

12

1.1

100

e7,260

450,000

17

<10

49

360

6

160

225

<100

900,000

<10

560

830

<1

980

<2

<5

2,200

93

4,600

TABLE 6 131
Table 6. Statistical summary of water-quality data for sites in the Sand Coulee Coal Area, Montana, July 

through September 1996 (Continued)

1994

Property or constituent 

(reporting unit)

Number 

of 

samples

Maximum Minimum Mean Median

Site 12, 4722351 10553202-French Coulee wetlands inflow No. 2 at Belt, Mont.

Streamflow, instantaneous (f^/s)

Specific conductance, onsite (uS/cm)

Temperature, water (°C)

pH, onsite (standard units)

Hardness, total (mg/L as CaCO3)

Calcium, dissolved (mg/L as Ca)

Magnesium, dissolved (mg/L as Mg)

Sodium, dissolved (mg/L as Na)

Potassium, dissolved (mg/L as K)

Acidity (mg/L as H+)

Sulfate, dissolved (mg/L as SO4)

Chloride, dissolved (mg/L as Cl)

Fluoride, dissolved (mg/L as F)

Silica, dissolved (mg/L as SiO2 )

Aluminum, dissolved (ug/L as Al)

Arsenic, dissolved (ug/L as As)

Barium, dissolved (Mg/L as Ba)

Beryllium, dissolved (ug/L as Be)

Boron, dissolved (ug/L as B)

Cadmium, dissolved (ug/L as Cd)

Chromium, dissolved (ug/L as Cr)

Cobalt, dissolved (ug/L as Co)

Copper, dissolved (ug/L as Cu)

Iron, dissolved (ug/L as Fe)

Lead, dissolved (ug/L as Pb)

Lithium, dissolved (Mg/L as Li)

Manganese, dissolved (ug/L as Mn)

Molybdenum, dissolved (ug/L as Mo)

Nickel, dissolved (ug/L as Ni)

Silver, dissolved (ug/L as Ag)

Strontium, dissolved (ug/L as Sr)

Vanadium, dissolved (ug/L as V)

Zinc, dissolved (ug/L as Zn)

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

4

6

6

6

6

6

6

6

6

6

6

6

6

6

6

0.04

5,550

13.0

2.8

1,000

230

110

13

5.8

98

6,000

13

3.9

100

480,000

22

19

56

390

10

190

480

<120

1,000,000

2

650

930

1.6

1,100

29

2,300

87

5,100

0.03

3,640

8.5

2.6

660

140

75

12

.8

45

3,300

9.1

<1

70

214,000

<2

8

26

230

5

100

220

<50

440,000

<4

320

430

<1

490

<5

1,200

<60

2,300

0.03

4,430

11.0

2.8

827

183

90

12

4.3

69

4,550

11.0

'2.7

88

337,000

'9.3

12.5

41

--

7.5

130

323

-

693,000

'1.8

460

650

-

780

-

1,720

-

3,550

0.03

4,350

11.5

2.8

860

190

93

12

4.8

72

4,450

10.5

2.2

90

335,000

5

12

42

-

7.5

125

335

<100

700,000

2

460

670

<1

840

<10

1,750

62

3,700

132 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
Table 6. Statistical summary of water-quality data for sites in the Sand Coulee Coal Area, Montana, July 

through September 1996 (Continued)

1994

Property or constituent 

(reporting unit)

Number 

of 

samples

Maximum Minimum Mean Median

Site 13, 472305110551701-Lewis Coulee above Castner Park, at Belt, Mont.

Streamflow, instantaneous (ft3/s)

Specific conductance, onsite (MS/cm)

Temperature, water (°C)

pH, onsite (standard units)

Hardness, total (mg/L as CaCC^)

Calcium, dissolved (mg/L as Ca)

Magnesium, dissolved (mg/L as Mg)

Sodium, dissolved (mg/L as Na)

Potassium, dissolved (mg/L as K)

Acidity (mg/L as H+)

Alkalinity (mg/L as CaCO3 )

Sulfate, dissolved (mg/L as SO4)

Chloride, dissolved (mg/L as Cl)

Fluoride, dissolved (mg/L as F)

Silica, dissolved (mg/L as SiC>2)

Dissolved solids, calculated (mg/L)

Aluminum, dissolved (Mg/L as Al)

Arsenic, dissolved (Mg/L as As)

Barium, dissolved (Mg/L as Ba)

Beryllium, dissolved (Mg/L as Be)

Boron, dissolved (Mg/L as B)

Cadmium, dissolved (Mg/L as Cd)

Chromium, dissolved (Mg/L as Cr)

Cobalt, dissolved (Mg/L as Co)

Copper, dissolved (Mg/L as Cu)

Iron, dissolved (Mg/L as Fe)

Lead, dissolved (Mg/L as Pb)

Lithium, dissolved (Mg/L as Li)

Manganese, dissolved (Mg/L as Mn)

Molybdenum, dissolved (Mg/L as Mo)

Nickel, dissolved (M8/L as Ni)

Selenium, dissolved (Mg/L as Se)

Silver, dissolved (Mg/L as Ag)

Strontium, dissolved (Mg/L as Sr)

Vanadium, dissolved (Mg/L as V)

Zinc, dissolved (Mg/L as Zn)

24

24

24

24

24

24

24

24

23

24

24

24

24

21

24

24

24

24

24

24

21

24

24

24

24

24

24

24

24

24

24

11

24

24

24

24

0.02

4,850

14.0

2.8

1,000

200

130

27

2.8

63

e<l

5,700

26

2.1

88

e6,960

530,000

2

20

31

320

65

190

5,900

200

560,000

3

520

1,000

1

2,200

<10

11

1,600

150

8,300

0.002

3,890

6.5

2.4

850

160

110

24

.8

35

e<l

3,500

4.3

<1

74

e4,630

250,000

<1

<3

20

220

9

100

750

<80

450,000

<1

390

840

<1

1,800

<1

<3

1,300

<48

6,500

0.01

4,310

9.7

2.7

934

177

120

26

1.9

56

-

4,290

8.7

'1.0

82

e5,460

300,000

'.9

'14

23

267

43

129

1,450

'89

504,000

'.7

452

923

-

2,080

-

-

1,490

'70

7,450

0.01

4,220

9.5

2.7

920

175

120

26

2.2

57

e<l

4,200

6.8

<1

83

e5,420

290,000

<2

<10

22

270

44

125

1,000

70

505,000

<1

450

920

<1

2,100

<1

<5

1,500

41

7,450

TABLE 6 133
Table 6. Statistical summary of water-quality data for sites in the Sand Coulee Coal Area, Montana, July 

through September 1996 (Continued)

1994

Property or constituent 

(reporting unit)

Number 

of 

samples

Maximum Minimum Mean Median

Site 14, 472306111103601-Mine drain to Mining Coulee near Sand Coulee, Mont.

Streamflow, instantaneous (f^/s)

Specific conductance, onsite (jaS/cm)

Temperature, water (°C)

pH, onsite (standard units)

Hardness, total (mg/L as CaCO3)

Calcium, dissolved (mg/L as Ca)

Magnesium, dissolved (mg/L as Mg)

Sodium, dissolved (mg/L as Na)

Potassium, dissolved (mg/L as K)

Acidity (mg/L as if)

Alkalinity (mg/L as CaCO3 )

Sulfate, dissolved (mg/L as SO4)

Fluoride, dissolved (mg/L as F)

Silica, dissolved (mg/L as SiO2)

Dissolved solids, calculated (mg/L)

Aluminum, dissolved (Mg/L as Al)

Arsenic, dissolved (Mg/L as As)

Barium, dissolved (Mg/L as Ba)

Beryllium, dissolved (Mg/L as Be)

Boron, dissolved (Mg/L as B)

Cadmium, dissolved (Mg/L as Cd)

Chromium, dissolved (Mg/L as Cr)

Cobalt, dissolved (Mg/L as Co)

Copper, dissolved (Mg/L as Cu)

Iron, dissolved (Mg/L as Fe)

Lead, dissolved (Mg/L as Pb)

Lithium, dissolved (Mg/L as Li)

Manganese, dissolved (Mg/L as Mn)

Molybdenum, dissolved (Mg/L as Mo)

Nickel, dissolved (Mg/L as Ni)

Selenium, dissolved (Mg/L as Se)

Silver, dissolved (Mg/L as Ag)

Strontium, dissolved (Mg/L as Sr)

Vanadium, dissolved (Mg/L as V)

Zinc, dissolved (Mg/L as Zn)

25

25

25

25

25

25

25

25

25

25

25

25

20

24

25

25

25

25

25

25

24

25

25

25

25

25

25

24

25

25

12

25

25

17

25

0.04

7,620

14.5

3.0 '

1,600

310

220

23

.4

160

e<l

12,000

8.4

140

el 4,600

990,000

12

85

100

890

98

400

9,500

120

1,200,000

<10

1,500

3,900

3

8,700

<10

54

1,300

490

38,000

0.01

6,680

7.5

2.4

uoo

210

190

17

<.l

140

e<l

8,700

<1

55

el 1,200

860,000

<1

<100

40

220

71

130

2,900

<100

940,000

<1

1,100

2,900

<1

7,200

<1

<1

1,100

<120

32,000

0.02

7,310

9.6

2.6

1,530

281

202

20

'.2

150

--

9,860

'2.3

118

e!2,500

893,000

'2.8

'76

86

693

84

315

4,060

'90

1,060,000

-

1,210

3,390

'1.5

7,830

--

--

1,220

'345

33,700

0.01

7,300

9.5

2.6

1,500

280

200

20

.2

150

e<l

9,700

1.4

130

e!2,300

890,000

1

<100

94

730

85

320

3,600

<200

1,100,000

<1

1,200

3,400

1

7,800

<2

<10

1,200

340

33,000

134 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
Table 6. Statistical summary of water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 through 

September 1996 (Continued)

Property or constituent 

(reporting unit)

Site 16, 472313111104901

Streamflow, instantaneous (ft3/s)

Specific conductance, onsite (nS/cm)

Temperature, water (°C)

pH, onsite (standard units)

Hardness, total (mg/L as CaCC^)

Calcium, dissolved (mg/L as Ca)

Magnesium, dissolved (mg/L as Mg)

Sodium, dissolved (mg/L as Na)

Potassium, dissolved (mg/L as K.)

Acidity (mg/L as H+)

Alkalinity (mg/L as CaCO3 )

Sulfate, dissolved (mg/L as 804)

Chloride, dissolved (mg/L as Cl)

Fluoride, dissolved (mg/L as F)

Silica, dissolved (mg/L as SiC^)

Dissolved solids, calculated (mg/L)

Aluminum, dissolved (Hg/L as Al)

Arsenic, dissolved (ng/L as As)

Barium, dissolved (|ig/L as Ba)

Beryllium, dissolved (ng/L as Be)

Boron, dissolved (ng/L as B)

Cadmium, dissolved (ng/L as Cd)

Chromium, dissolved (|ig/L as Cr)

Cobalt, dissolved (|ig/L as Co)

Copper, dissolved (^lg/L as Cu)

Iron, dissolved (ng/L as Fe)

Lead, dissolved (^lg/L as Pb)

Lithium, dissolved (|ig/L as Li)

Manganese, dissolved (ng/L as Mn)

Molybdenum, dissolved (|ig/L as Mo)

Nickel, dissolved (ng/L as Ni)

Selenium, dissolved (|ig/L as Se)

Silver, dissolved (ng/L as Ag)

Strontium, dissolved (ng/L as Sr)

Vanadium, dissolved (ng/L as V)

Zinc, dissolved (|ig/L as Zn)

Number 

of 

samples

Maximum Minimum Mean Median

Mine Drain to Sand Coulee near Sand Couiee, Mont.

25

19

19

19

19

19

19

19

19

19

19

19

19

19

19

19

19

19

19

19

18

18

19

19

19

19

19

19

19

19

19

6

18

19

19

19

0.11

3,480

23.0

3.4

950

180

120

21

2

44

e<l

3,600

15

3.1

71

e4,650

270,000

11

30

34

360

50

100

2,300

<60

410,000

<10

400

1,400

2

2,600

<5

3

1,100

160

12,000

0.00

3,100

7.5

2.9

790

160

95

18

1.6

35

e<l

2,700

3.9

<1

53

e3,570

180,000

<1

<4

26

130

18

60

800

<30

290,000

<1

310

1,100

<1

2,100

<1

<3

940

<36

9,200

0.03

3,290

11.1

3.1

849

167

105

19

1.8

41

--

3,020

7.4

'1.5

64

e3,970

229,000

U.6

»18

31

273

30

80

1,320

--

349,000

--

364

1,280

-

2,370

--

--

1,030

'104

10,300

0.02

3,290

10.5

3.2

850

160

100

19

1.8

42

e<l

3,000

5.2

1.3

64

e3,880

230,000

4

25

30

280

30

80

1,100

<50

350,000

<1

370

1,300

<1

2,300

<2

<5

1,000

98

10,000

TABLE 6 135
Table 6. Statistical summary of water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 

through September 1996 (Continued)

Property or constituent 

(reporting unit)

Number 

of 

samples

Maximum Minimum Mean Median

Site 17, 472330111082801-Centerville wetlands Inflow at Centerville, Mont.

Streamflow, instantaneous (ft3/s)

Specific conductance, onsite ((iS/cm)

Temperature, water (°C)

pH, onsite (standard units)

Hardness, total (mg/L as CaCO3)

Calcium, dissolved (mg/L as Ca)

Magnesium, dissolved (mg/L as Mg)

Sodium, dissolved (mg/L as Na)

Potassium, dissolved (mg/L as K)

Acidity (mg/L as H+)

Alkalinity (mg/L as CaCO3)

Sulfate, dissolved (mg/L as SO4)

Chloride, dissolved (mg/L as Cl)

Fluoride, dissolved (mg/L as F)

Silica, dissolved (mg/L as SiO2 )

Dissolved solids, calculated (mg/L)

Aluminum, dissolved (Mg/L as Al)

Arsenic, dissolved (Mg/L as As)

Barium, dissolved (Mg/L as Ba)

Beryllium, dissolved (Mg/L as Be)

Boron, dissolved (Mg/L as B)

Cadmium, dissolved (Mg/L as Cd)

Chromium, dissolved (Mg/L as Cr)

Cobalt, dissolved (Mg/L as Co)

Copper, dissolved (Mg/L as Cu)

Iron, dissolved (Mg/L as Fe)

Lead, dissolved (Mg/L as Pb)

Lithium, dissolved (Mg/L as Li)

Manganese, dissolved (Mg/L as Mn)

Molybdenum, dissolved (Mg/L as Mo)

Nickel, dissolved (Mg/L as Ni)

Selenium, dissolved (Mg/L as Se)

Silver, dissolved (Mg/L as Ag)

Strontium, dissolved (Mg/L as Sr)

Vanadium, dissolved (Mg/L as V)

Zinc, dissolved (Mg/L as Zn)

25

25

25

25

25

25

25

25

25

25

25

25

25

24

25

25

25

25

25

25

22

22

25

19

25

25

25

25

25

25

25

12

25

25

25

25

0.02

3,690

12.5

2.8

1,100

260

100

16

1.9

77

e<l

4,400

9.7

2.4

94

e5,330

260,000

3

12

37

220

32

40

520

130

290,000

4

590

2,200

I

950

2

3

1,100

71

2,500

0.01

2,970

7.5

2.5

610

130

70

13

.2

33

e<l

2,400

1.4

<1

67

e3,070

190,000

<1

5

24

130

11

<20

310

80

170,000

<1

270

1,100

<1

630

<2

<2

760

<12

1,700

0.02

3,310

9.7

2.6

764

173

80

15

1.1

42

-

2,996

4.2

'1.0

82

e3,820

223,000

-

8

31

189

25

'19

428

106

233,000

'2.2

349

1,430

-

779

'1.8

-

890

1 27

2,240

0.02

3,300

10.0

2.6

760

170

78

15

1

42

e<l

2,900

2.9

1.0

84

e3,740

230,000

<1

7

31

190

27

20

440

110

240,000

2

340

1,400

<1

790

2

<3

880

11

2,300

136 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water In the Sand Coulee Coal 

Area, Montana
Table 6. Statistical summary of water-quality data for sites in the Sand Coulee Coal Area, Montana, July 

through September 1996 (Continued)

1994

Property or constituent 

(reporting unit)

Number 

of 

samples

Maximum Minimum Mean Median

Site 18, 472331111083001 -Centerville wetlands outflow at Centervllle, Mont.

Streamflow, instantaneous (ft3/s)

Specific conductance, onsite (fiS/cm)

Temperature, water (°C)

pH, onsite (standard units)

Hardness, total (mg/L as CaCO3 )

Calcium, dissolved (mg/L as Ca)

Magnesium, dissolved (mg/L as Mg)

Sodium, dissolved (mg/L as Na)

Potassium, dissolved (mg/L as K)

Acidity (mg/L as H"^

Alkalinity (mg/L as CaCO3 )

Sulfate, dissolved (mg/L as SO4)

Chloride, dissolved (mg/L as Cl)

Fluoride, dissolved (mg/L as F)

Silica, dissolved (mg/L as SiO2)

Dissolved solids, calculated (mg/L)

Aluminum, dissolved (Mg/L as Al)

Arsenic, dissolved (Mg/L as As)

Barium, dissolved (Mg/L as Ba)

Beryllium, dissolved (Mg/L as Be)

Boron, dissolved (Mg/L as B)

Cadmium, dissolved (Mg/L as Cd)

Chromium, dissolved (Mg/L as Cr)

Cobalt, dissolved (Mg/L as Co)

Copper, dissolved (Mg/L as Cu)

Iron, dissolved (Mg/L as Fe)

Lead, dissolved (Mg/L as Pb)

Lithium, dissolved (Mg/L as Li)

Manganese, dissolved ([ig/L as Mn)

Molybdenum, dissolved (Mg/L as Mo)

Nickel, dissolved (Mg/L as Ni)

Selenium, dissolved (Mg/L as Se)

Silver, dissolved (Mg/L as Ag) ,

Strontium, dissolved (Mg/L as Sr)

Vanadium, dissolved (Mg/L as V)

Zinc, dissolved (Mg/L as Zn)

16

24

24

24

24

24

24

24

24

24

24

24

24

23

23

24

24

24

24

24

24

19

24

24

24

24

24

24

24

24

24

11

24

24

24

24

0.02

5,370

27.5

4.3

2,200

550

190

45

140

55

e<l

4,600

44

1.5

75

e5,870

280,000

3

39

44

410

30

40

640

130

240,000

1

650

6,100

1

1,000

1

2

2,200

30

2,500

0.002

1,760

0.0

2.4

370

90

34

7.0

4.2

14

e<l

1,100

2.4

<1

26

el, 440

84,000

<1

<3

11

60

12

<20

190

<30

50,000

<1

120

740

<1

300

<1

<2

390

<6

820

0.01

3,596

11.8

2.8

1,210

304

109

23

41

33

-

3,130

18

'1.0

56

e4,010

195,000

--

'12

28

203

22

'15

422

'74

129,000

--

395

3,020

--

695

--

--

1,260

--

1,750

0.01

3,425

12.5

2.7

1,050

280

96

19

28

32

e<l

3,050

14

<1

61

e3,920

200,000

<1

8

28

190

21

<20

400

70

105,000

<1

380

2,500

<1

695

<2

<3

1,100

<18

1,700

TABLE 6 137
Table 6. Statistical summary of water-quality data for sites in the Sand Coulee Coal Area, Montana, July 

through September 1996 (Continued)

1994

Property or constituent 

(reporting unit)

Number 

of 

samples

Maximum Minimum Mean Median

Site 19, 4723341 111 04401 -Mount Oregon Mine drain to Kate's Coulee at Sand Coulee, Mont.

Streamflow, instantaneous (ft3/s)

Specific conductance, onsite (|U.S/cm)

Temperature, water (°C)

pH, onsite (standard units)

Hardness, total (mg/L as CaCO3)

Calcium, dissolved (mg/L as Ca)

Magnesium, dissolved (mg/L as Mg)

Sodium, dissolved (mg/L as Na)

Potassium, dissolved (mg/L as K)

Acidity (mg/L as H+)

Alkalinity (mg/L as CaCO3)

Sulfate, dissolved (mg/L as 864)

Chloride, dissolved (mg/L as Cl)

Fluoride, dissolved (mg/L as F)

Silica, dissolved (mg/L as SiO2)

Dissolved solids, calculated (mg/L)

Aluminum, dissolved (ng/L as Al)

Arsenic, dissolved (Hg/L as As)

Barium, dissolved Gig/L as Ba)

Beryllium, dissolved (ng/L as Be)

Boron, dissolved (ng/L as B)

Cadmium, dissolved (Hg/L as Cd)

Chromium, dissolved (ng/L as Cr)

Cobalt, dissolved (ng/L as Co)

Copper, dissolved (ng/L as Cu)

Iron, dissolved (ng/L as Fe)

Lead, dissolved (|ig/L as Pb)

Lithium, dissolved (ng/L as Li)

Manganese, dissolved (\ig/L as Mn)

Molybdenum, dissolved (ng/L as Mo)

Nickel, dissolved (fJg/L as Ni)

Selenium, dissolved (^ig/L as Se)

Silver, dissolved (ng/L as Ag)

Strontium, dissolved (ng/L as Sr)

Vanadium, dissolved (|ig/L as V)

Zinc, dissolved ((uig/L as Zn)

25

25

25

25

25

25

25

25

24

25

25

25

25

24

25

25

25

25

25

25

21

18

25

18

25

25

25

25

25

25

25

12

25

25

25

25

0.18

3,010

15.0

4.7

960

170

130

25

5.2

33

e<l

3,700

17

3.4

41

e4,500

180,000

24

28

35

310

9

50

740

<60

340,000

2

470

1,300

12

1,600

<5

10

1,300

160

6,600

0.02

2,690

10.0

4.0

900

160

120

22

4.1

27

e<l

2,200

3

<1

34

e2,990

140,000

6

12

23

240

6

20

510

<30

230,000

<1

380

1,200

<30

1,400

<1

<3

1,100

24

5,500

0.07

2,830

11.4

4.2

939

166

127

24

4.6

30

-

2,700

6.2

'2.0

38

e3,540

164,000

14

18

25

265

8

33

651

--

296,000

'.9

418

1,240

'11

1,530

--

--

1,180

102

6,080

0.07

2,860

11.0

4.1

940

170

130

24

4.6

30

e<l

2,500

4.5

2.1

37

e3,390

170,000

14

14

25

260

8

30

665

<30

290,000

<10

420

1,200

10

1,500

<1

<3

1,200

94

6,100

138 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
Table 6. Statistical summary of water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 

through September 1996 (Continued)

Property or constituent 

(reporting unit)

Number 

of 

samples

Maximum Minimum Mean Median

Site 20, 472346111 102401-Nelson Mine drain to Sand Coulee at Sand Coulee, Mont.

Streamflow, instantaneous (f^/s)

Specific conductance, onsite (|aS/cm)

Temperature, water (°C)

pH, onsite (standard units)

Hardness, total (mg/L as CaCO3)

Calcium, dissolved (mg/L as Ca)

Magnesium, dissolved (mg/L as Mg)

Sodium, dissolved (mg/L as Na)

Potassium, dissolved (mg/L as K)

Acidity (mg/L as H+)

Alkalinity (mg/L as CaCO3)

Sulfate, dissolved (mg/L as SO4)

Fluoride, dissolved (mg/L as F)

Silica, dissolved (mg/L as SiO2)

Dissolved solids, calculated (mg/L)

Aluminum, dissolved (Mg/L as Al)

Arsenic, dissolved (Mg/L as As)

Barium, dissolved (Mg/L as Ba)

Beryllium, dissolved (Mg/L as Be)

Boron, dissolved (Mg/L as B)

Cadmium, dissolved (Mg/L as Cd)

Chromium, dissolved (Mg/L as Cr)

Cobalt, dissolved (Mg/L as Co)

Copper, dissolved (Mg/L as Cu)

Iron, dissolved (Mg/L as Fe)

Lead, dissolved (Mg/L as Pb)

Lithium, dissolved (Mg/L as Li)

Manganese, dissolved (Mg/L as Mn)

Molybdenum, dissolved (Mg/L as Mo)

Nickel, dissolved (Mg/L as Ni)

Selenium, dissolved (Mg/L as Se)

Silver, dissolved (Mg/L as Ag)

Strontium, dissolved (Mg/L as Sr)

Vanadium, dissolved (Mg/L as V)

Zinc, dissolved (Mg/L as Zn)

25

25

25

25

25

25

25

25

25

25

25

24

18

24

24

25

24

25

25

21

24

25

25

25

25

25

25

25

25

25

12

24

25

18

25

0.08

8,980

17.5

3.0

!,800

280

270

24

2

200

e<l

14,000

7.3

150

el 7,200

1,000,000

76

44

140

1,000

120

400

5,600

650

2,000,000

1

1,400

12,000

6

5,500

<25

<25

1,800

660

19,000

0.009

6,810

5.5

2.3

1,400

190

210

16

.3

140

e<l

8,900

<1

59

el 1,600

740,000

16

<10

40

620

84

270

1,700

230

1,200,000

<1

880

7,100

<1

4,300

<2

<1

1,400

<120

15,000

0.03

7,800

11.6

2.6

1,580

249

232

20

.8

168

--

10,900

'2.9

126

e!4,000

889,000

53

'36

96

781

106

325

2,540

369

1,390,000

--

1,010

8,650

'3

4,760

-

-

1,560

'385

17,600

0.02

7,970

11.5

2.6

1,600

250

230

20

.7

170

e<l

11,000

1.6

140

e!4,000

890,000

51

<100

99

790

110

320

2,200

370

1,500,000

<1

970

8,200

3

4,800

<5

<12

1,600

360

18,000

TABLE 6 139
Table 6. Statistical summary of water-quality data for sites in the Sand Coulee Coal Area, Montana, July 

through September 1996 (Continued)

1994

Property or constituent 

(reporting unit)

Number 

of 

samples

Maximum Minimum Mean Median

Site 21, 472309110551201-Lewis Coulee below mine adit, at Belt, Mont.

Streamflow, instantaneous (f^/s)

Specific conductance, onsite (uS/cm)

Temperature, water (°C)

pH, onsite (standard units)

Hardness, total (mg/L as CaCO3)

Calcium, dissolved (mg/L as Ca)

Magnesium, dissolved (mg/L as Mg)

Sodium, dissolved (mg/L as Na)

Potassium, dissolved (mg/L as K)

Acidity (mg/L as H*)

Alkalinity (mg/L as CaCO3 )

Sulfate, dissolved (mg/L as SO4)

Chloride, dissolved (mg/L as Cl)

Fluoride, dissolved (mg/L as F)

Silica, dissolved (mg/L as SiO2)

Dissolved solids, calculated (mg/L)

Aluminum, dissolved (ug/L as Al)

Arsenic, dissolved (ug/L as As)

Barium, dissolved (ug/L as Ba)

Beryllium, dissolved (ug/L as Be)

Boron, dissolved (ug/L as B)

Cadmium, dissolved (ug/L as Cd)

Chromium, dissolved (ug/L as Cr)

Cobalt, dissolved (ug/L as Co)

Copper, dissolved (ug/L as Cu)

Iron, dissolved (ug/L as Fe)

Lead, dissolved (jig/L as Pb)

Lithium, dissolved (ug/L as Li)

Manganese, dissolved (ug/L as Mn)

Molybdenum, dissolved (ug/L as Mo)

Nickel, dissolved (ug/L as Ni)

Selenium, dissolved (\igfL as Se)

Silver, dissolved (ug/L as Ag)

Strontium, dissolved (ug/L as Sr)

Vanadium, dissolved (ug/L as V)

Zinc, dissolved (ug/L as Zn)

25

25

25

25

25

25

25

25

25

25

25

25

25

21

25

25

25

25

25

25

22

23

25

25

25

25

25

25

25

25

25

12

25

25

25

25

0.30

3,810

24.0

7.4

1,000

200

130

60

7.7

55

e<l

4,000

17

2.2

76

e5,290

280,000

2

130

32

290

21

60

3,300

80

560,000

2

480

2,100

10

1,600

2

18

1,400

110

5,600

0.004

818

.5

3

370

58

54

19

4.4

<.l

e<l

180

7.2

<1

7.9

e485

20

<1

9

<.5

40

<1

<5

20

<10

2,200

<1

47

56

<1

20

<1

<1

400

<6

32

0.04

3,110

11.4

3.9

876

167

111

25

5.8

'37

--

2,880

11

'1.2

59

e3,860

193,000

-

29

l \9

220

'11

'36

871

1 29

373,000

'1.6

360

1,320

! .8

1,160

-

'1.7

1,150

1 56

3,880

0.01

3,510

11.5

3.2

950

180

120

24

5.8

45

. e<l

3,200

10

<1

69

e4,310

230,000

<1

20

19

250

10

30

750

<50

440,000

<10

410

1,500

<1

1,300

<1

<5

1,200

59

4,500

140 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
Table 6. Statistical summary of water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 

through September 1996 (Continued)

Property or constituent Number 

(reporting unit) samples Maximum Minimum Mean Median

Site 22, 472446111085101-Pipe spring at Tracy, Mont.

Streamflow, instantaneous (f^/s)

Specific conductance, onsite (jjS/cm)

Temperature, water (°C)

pH, onsite (standard units)

Hardness, total (mg/L as CaCC>3)

Calcium, dissolved (mg/L as Ca)

Magnesium, dissolved (mg/L as Mg)

Sodium, dissolved (mg/L as Na)

Potassium, dissolved (mg/L as K)

Acidity (mg/L as H4")

Alkalinity (mg/L as CaCO3)

Sulfate, dissolved (mg/L as 804)

Chloride, dissolved (mg/L as Cl)

Fluoride, dissolved (mg/L as F)

Silica, dissolved (mg/L as SiO2)

Dissolved solids, calculated (mg/L)

Aluminum, dissolved (|ag/L as Al)

Arsenic, dissolved (ng/L as As)

Barium, dissolved (jag/L as Ba)

Beryllium, dissolved (jag/L as Be)

Boron, dissolved (\ig/L as B)

Cadmium, dissolved (Hg/L as Cd)

Chromium, dissolved (ng/L as Cr)

Cobalt, dissolved (Mg/L as Co)

Copper, dissolved (|4g/L as Cu)

Iron, dissolved (|xg/L as Fe)

Lead, dissolved (|xg/L as Pb)

Lithium, dissolved (\ig/L as Li)

Manganese, dissolved (ng/L as Mn)

Molybdenum, dissolved (|xg/L as Mo)

Nickel, dissolved (jag/L as Ni)

Selenium, dissolved (|xg/L as Se)

Silver, dissolved (^g/LasAg)

Strontium, dissolved (|xg/L as Sr)

Vanadium, dissolved (jJg/L as V)

Zinc, dissolved (jag/L as Zn)

25

25

25

25

25

25

25

25

25

24

25

25

25

25

25

25

25

25

25

25

25

25

25

25

25

25

25

25

25

25

25

12

25

25

25

25

0.61

2,360

11.5

3.1

540

91

76

25

4.9

13

e<l

1,300

8.1

2.5

54

el, 670

67,000

1

7

12

180

16

7

320

60

39,000

2

160

930

2

600

1

2

680

<18

1,900

0.03

1,410

8.5

2.4

410

63

57

19

1.7

4.2

e<l

640

5.4

.5

38

e875

22,000

<1

<2

4

130

<10

<5

150

<10

3,400

<1

110

480

<1

280

<1

<1

490

<6

810

0.09

1,620

10.7

2.9

461

75

66

22

2.5

5.9

--

831

6.2

1.2

46

el, 090

32,000

-

U

6

157

'8

-

189

l \5

6,800

--

136

578

--

346

'1

-

586

-

1,050

0.05

1,620

10.5

2.9

460

73

67

22

2.5

6.0

e<l

810

5.9

1

45

el, 080

34,000

<1

4

6

160

7

<5

190

10

5,900

<1

130

580

<1

350

<2

<1

580

<6

1,100

TABLE 6 141
Table 6. Statistical summary of water-quality data for sites in the Sand Coulee Coal Area, Montana, July 

through September 1996 (Continued)

1994

Property or constituent 

(reporting unit)

Number 

of 

samples

Maximum Minimum Mean Median

Site 23, 472447111085301 -Stock tank spring at Tracy, Mont.

Streamflow, instantaneous (ft3/s)

Specific conductance, onsite (MS/cm)

Temperature, water (°C)

pH, onsite (standard units)

Hardness, total (mg/L as CaCO3)

Calcium, dissolved (mg/L as Ca)

Magnesium, dissolved (mg/L as Mg)

Sodium, dissolved (mg/L as Na)

Potassium, dissolved (mg/L as K)

Acidity (mg/L as H+)

Alkalinity (mg/L as CaCO3)

Sulfate, dissolved (mg/L as SO4)

Chloride, dissolved (mg/L as Cl)

Fluoride, dissolved (mg/L as F)

Silica, dissolved (mg/L as SiO2)

Dissolved solids, calculated (mg/L)

Aluminum, dissolved (Mg/L as Al)

Arsenic, dissolved (Mg/L as As)

Barium, dissolved (Mg/L as Ba)

Beryllium, dissolved (Mg/L as Be)

Boron, dissolved (Mg/L as B)

Cadmium, dissolved (Mg/L as Cd)

Chromium, dissolved (Mg/L as Cr)

Cobalt, dissolved (Mg/L as Co)

Copper, dissolved (Mg/L as Cu)

Iron, dissolved (Mg/L as Fe)

Lead, dissolved (Mg/L as Pb)

Lithium, dissolved (Mg/L as Li)

Manganese, dissolved (Mg/L as Mn)

Molybdenum, dissolved (Mg/L as Mo)

Nickel, dissolved (Mg/L as Ni)

Selenium, dissolved (Mg/L as Se)

Silver, dissolved (Mg/L as Ag)

Strontium, dissolved (Mg/L as Sr)

Vanadium, dissolved (Mg/L as V)

Zinc, dissolved (Mg/L as Zn)

20

25

25

25

25

25

25

25

24

24

24

24

24

24

25

24

25

24

25

25

24

23

25

23

25

25

23

25

25

23

25

12

25

25

25

25

0.003

967

16.0

7.8

500

84

72

17

2.7

.4

239

300

6.5

1.2

13

622

40

<2

56

<.5

100

4

<5

<3

<IO

28

30

39

5

20

20

3

2

660

<6

25

0.002

736

4.0

7.1

350

56

52

13

1.8

<.l

216

140

4.9

.4

9.6

425

<5

<1

41

<.5

50

<1

<5

<1

<10

<3

<1

32

<1

<10

<10

<5

<1

460

<6

7

0.002

800

8.8

7.4

405

65

59

15

2.1

'.1

228

182

5.8

1.0

11

478

'6

--

47

--

74

-

-

-

-

'5

! 7

35

'l

'6

1 5

1 2

-

514

--

12

0.002

782

9.5

7.4

400

63

58

15

2.0

.1

228

170

5.8

1.0

11

462

<10

<1

48

<.5

70

<1

<5

<3

<10

3

<10

35

<1

<10

<10

2

<1

510

<6

12

142 Water-Quality Data (July 1994 through September 1996) and Statistical Summarlet of Data tor Surface Water In the Sand Coulee Coal 

Area, Montana
Table 6. Statistical summary of water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 

through September 1996 (Continued)

Property or constituent 

(reporting unit)

Number 

of 

samples

Maximum Minimum Mean Median

Site 24, 47251 311 1082501 -Johnson Badwater Mine small wetlands Inflow near Tracy, Mont.

Streamflow, instantaneous (ft-^/s)

Specific conductance, onsite (uS/cm)

Temperature, water (°C)

pH, onsite (standard units)

Hardness, total (mg/L as CaCQ$)

Calcium, dissolved (mg/L as Ca)

Magnesium, dissolved (mg/L as Mg)

Sodium, dissolved (mg/L as Na)

Potassium, dissolved (mg/L as K)

Acidity (mg/L as IT1")

Alkalinity (mg/L as CaCO3 )

Sulfate, dissolved (mg/L as 864)

Chloride, dissolved (mg/L as Cl)

Fluoride, dissolved (mg/L as Fl)

Silica, dissolved (mg/L as SiO2)

Dissolved solids, calculated (mg/L)

Aluminum, dissolved (ug/L as Al)

Arsenic, dissolved (ug/L as As)

Barium, dissolved (ug/L as Ba)

Beryllium, dissolved (ug/L as Be)

Boron, dissolved (ug/L as B)

Cadmium, dissolved (ug/L as Cd)

Chromium, dissolved (ug/L as Cr)

Cobalt, dissolved (ug/L as Co)

Copper, dissolved (ug/L as Cu)

Iron, dissolved (ug/L as Fe)

Lead, dissolved (ug/L as Pb)

Lithium, dissolved (ug/L as Li)

Manganese, dissolved (ug/L as Mn)

Molybdenum, dissolved (ug/L as Mo)

Nickel, dissolved (ug/L as Ni)

Selenium, dissolved (ug/L as Se)

Silver, dissolved (ug/L as Ag)

Strontium, dissolved (ug/L as Sr)

Vanadium, dissolved (ug/L as V)

Zinc, dissolved (ug/L as Zn)

25

25

25

25

25

25

25

25

25

25

25

25

25

25

25

25

25

25

25

25

25

21

25

18

25

25

25

25

25

25

25

12

24

25

25

25

0.01

2,300

11.5

4.0

1,000

180

140

26

7.5

14

e<l

2,000

9.8

8.3

52

e2,590

57,000

1

15

27

320

3

20

520

<40

130,000

<10

390

1,000

1

1,100

<5

4

1,300

34

3,300

0.007

2,100

8.0

3.5

850

140

120

22

6

9.7

e<l

1,400

5.4

3.2

47

el, 920

46,000

<1

8

19

200

<3

<10

400

<20

110,000

<1

320

840

<1

880

<1

<2

1,000

<6

2,500

0.01

2,190

9.9

3.8

939

166

127

24

7.1

12

--

1,620

6.9

6.1

49

e2,190

51,700

--

11

24

281

'2

-

449

--

124,000

--

367

942

-

980

--

--

1,160

1 14

2,920

0.01

2,180

10.0

3.8

940

170

130

24

7.1

11

e<l

1,600

6.3

6.2

49

e2,160

51,000

<1

9

24

280

2

<20

440

<30

120,000

<1

370

950

<1

970

<1

<3

1,200

<24

2,900

TABLE 6 143
Table 6. Statistical summary of water-quality data for sites in the Sand Coulee Coal Area, Montana, July 

through September 1996 (Continued)

1994

Property or constituent 

(reporting unit)

Number 

of 

samples

Maximum Minimum Mean Median

Site 25, 472513111082901-Johnson Badwater Mine large wetlands inflow near Tracy, Mont.

Streamflow, instantaneous (ft3/s)

Specific conductance, onsite (nS/cm)

Temperature, water (°C)

pH, onsite (standard units)

Hardness, total (mg/L as CaCO3 )

Calcium, dissolved (mg/L as Ca)

Magnesium, dissolved (mg/L as Mg)

Sodium, dissolved (mg/L as Na)

Potassium, dissolved (mg/L as K)

Acidity (mg/L as H+)

Alkalinity (mg/L as CaCO3 )

Sulfate, dissolved (mg/L as SO4)

Chloride, dissolved (mg/L as Cl)

Fluoride, dissolved (mg/L as F)

Silica, dissolved (mg/L as SiO2)

Dissolved solids, calculated (mg/L)

Aluminum, dissolved (Hg/L as Al)

Arsenic, dissolved (ng/L as As)

Barium, dissolved (|ig/L as Ba)

Beryllium, dissolved (|ig/L as Be)

Boron, dissolved (ng/L as B)

Cadmium, dissolved (|ig/L as Cd)

Chromium, dissolved (Mg/L as Cr)

Cobalt, dissolved (\ig/L as Co)

Copper, dissolved (|ig/L as Cu)

Iron, dissolved (|ig/L as Fe)

Lead, dissolved (pg/L as Pb)

Lithium, dissolved (pg/L as Li)

Manganese, dissolved (Hg/L as Mn)

Molybdenum, dissolved (|ig/L as Mo)

Nickel, dissolved (ng/L as Ni)

Selenium, dissolved (|lg/L as Se)

Silver, dissolved (ng/L as Ag)

Strontium, dissolved (ng/L as Sr)

Vanadium, dissolved (|ig/L as V)

Zinc, dissolved (H&'L as Zn)

25

25

25

25

25

25

25

25

25

25

25

25

25

24

25

25

25

25

25

25

22

25

25

25

24

25

25

25

25

25

25

12

25

25

25

25

0.01

4,520

11.5

2.8

1,200

190

170

27

2.3

52

e<l

4,700

21

6.1

87

e5,760

250,000

<5

23

40

380

100

60

3,800

200

410,000

2

490

1,700

2

2,500

1

9

1,200

64

10,000

0.004

3,560

8.5

2.3

910

150

130

23

1.0

30

e<l

2,600

4.9

<1

71

e3,340

150,000

<1

<2

21

240

58

<20

750

100

170,000

<1

330

1,100

<1

1,600

<1

<2

910

<36

6,200

0.01

4,190

9.9

2.6

1,050

170

154

25

1.5

43

--

3,540

8.2

'3.1

76

e4,530

216,000

--

'12

31

307

78

'33

1,310

142

329,000

».9

420

1,470

--

2,120

-

--

1,040

] 33

8,420

0.01

4,320

10.0

2.6

1,100

170

150

25

1.5

46

e<l

3,400

6.7

3.1

76

e4,450

230,000

<1

<4

32

300

77

30

1,000

140

350,000

<10

420

1,500

<1

2,200

<2

<4

1,000

22

8,800

144 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal 

Area, Montana
Table 6. Statistical summary of water-quality data for sites in the Sand Coulee Coal Area, Montana, July 

through September 1996 (Continued)

1994

Property or constituent 

(reporting unit)

Number 

of 

samples

Maximum Minimum Mean Median

Site 26, 47251 4111082301-Johnson Badwater Mine small wetlands outflow near Tracy, Mont.

Streamflow, instantaneous (ft^/s)

Specific conductance, onsite (jaS/cm)

Temperature, water (°C)

pH, onsite (standard units)

Hardness, total (mg/L as CaCO3 )

Calcium, dissolved (mg/L as Ca)

Magnesium, dissolved (mg/L as Mg)

Sodium, dissolved (mg/L as Na)

Potassium, dissolved (mg/L as K)

Acidity (mg/L as H+)

Alkalinity (mg/L as CaCO3)

Sulfate, dissolved (mg/L as SO4)

Chloride, dissolved (mg/L as Cl)

Fluoride, dissolved (mg/L as F)

Silica, dissolved (mg/L as SiC^)

Dissolved solids, calculated (mg/L)

Aluminum, dissolved (Mg/L as Al)

Arsenic, dissolved (Mg/L as As)

Barium, dissolved (Mg/L as Ba)

Beryllium, dissolved (Mg/L as Be)

Boron, dissolved (Mg/L as B)

Cadmium, dissolved (Mg/L as Cd)

Chromium, dissolved (Mg/L as Cr)

Cobalt, dissolved (Mg/L as Co)

Copper, dissolved (Mg/L as Cu)

Iron, dissolved (Mg/L as Fe)

Lead, dissolved (Mg/L as Pb)

Lithium, dissolved (Mg/L as Li)

Manganese, dissolved (Mg/L as Mn)

Molybdenum, dissolved (Mg/L as Mo)

Nickel, dissolved (Mg/L as Ni)

Selenium, dissolved (Mg/L as Se)

Silver, dissolved (Mg/L as Ag)

Strontium, dissolved (Mg/L as Sr)

Vanadium, dissolved (Mg/L as V)

Zinc, dissolved (Mg/L as Zn)

23

19

19

19

19

19

19

19

19

19

19

19

19

19

18

19

19

19

19

19

19

19

19

19

19

19

19

19

19

19

19

9

19

19

19

19

0.007

2,780

19.5

5.9

1,700

370

200

33

9.3

12

e<l

2,500

10

9.2

52

e3,030

61,000

<1

16

27

330

5

20

670 ,

<30

60,000

1

420

1,500

<10

1,100

<2

7

1,900

<18

3,400

0.001

2,100

0.0

2.6

510

100

64

11

2.4

2

e<l

1,300

4.8

2.7

24

el,780

3,300

<1

4

3

190

<1

<5

200

<10

2,900

<1

110

380

<1

230

<1

<1

530

<6

530

0.003

2,480

8.1

3.2

1,140

224

139

26

7.5

8.0

-

1,840

7.1

6.2

42

e2,370

41,600

--

10

19

265

'2

--

404

--

28,100

--

341

1,020

-

803

-

-

1,330

-

2,280

0.003

2,530

7.5

3.0

1,100

220

140

26

8.0

8.8

e<l

1,800

7.3

5.9

44

e2,320

43,000

<1

10

22

270

2

<20

400

<30

32,000

<1

370

1,000

<1

860

<1

<3

1,300

<18

2,400

TABLE 6 145
Table 6. Statistical summary of water-quality data for sites in the Sand Coulee Coal Area, Montana, July 1994 

through September 1996 (Continued)

Property or constituent 

(reporting unit)

Number 

of 

samples

Maximum Minimum Mean Median

Site 27, 47251 71 11 081 001 -Johnson Goodwater Mine small wetlands inflow near Tracy, Mont.

Streamflow, instantaneous (ft3/s)

Specific conductance, onsite (jxS/cm)

Temperature, water (°C)

pH, onsite (standard units)

Hardness, total (mg/L as CaCO3)

Calcium, dissolved (mg/L as Ca)

Magnesium, dissolved (mg/L as Mg)

Sodium, dissolved (mg/L as Na)

Potassium, dissolved (mg/L as K)

Acidity (mg/L as H+)

Alkalinity (mg/L as CaCO3 )

Sulfate, dissolved (mg/L as SO4)

Chloride, dissolved (mg/L as Cl)

Fluoride, dissolved (mg/L as F)

Silica, dissolved (mg/L as SiO2)

Dissolved solids, calculated (mg/L)

Aluminum, dissolved (Mg/L as Al)

Arsenic, dissolved (Mg/L as As)

Barium, dissolved (Mg/L as Ba)

Beryllium, dissolved (Mg/L as Be)

Boron, dissolved (Mg/L as B)

Cadmium, dissolved (Mg/L as Cd)

Chromium, dissolved (Mg/L as Cr)

Cobalt, dissolved (Mg/L as Co)

Copper, dissolved (Mg/L as Cu)

Iron, dissolved (Mg/L as Fe)

Lead, dissolved (Mg/L as Pb)

Lithium, dissolved (Mg/L as Li)

Manganese, dissolved (Mg/L as Mn)

Molybdenum, dissolved (Mg/L as Mo)

Nickel, dissolved (Mg/L as Ni)

Selenium, dissolved (Mg/L as Se)

Silver, dissolved (Mg/L as Ag)

Strontium, dissolved (Mg/L as Sr)

Vanadium, dissolved (Mg/L as V)

Zinc, dissolved (Mg/L as Zn)

25

25

25

25

25

25

25

25

25

25

25

25

25

25

25

25

25

25

25

25

25

25

25

25

25

25

25

25

25

25

25

12

25

25

25

25

0.018

1,290

16.5

7.9

730

130

100

19

5.5

1.7

281

480

8.8

1.6

12

912

50

<1

28

.5

140

<3

<20

40

<30

3,200

40

97

170

10

80

3

3

690

<18

140

0.0001

1,010

4.5

6.6

520

80

72

15

4.1

<.l

174

270

6.2

1.1

7.7

640

<10

<1

18

<.5

90

<1

<5

<1

<10

<3

<1

67

2

<1

<10

<5

<1

490

<6

13

0.005

1,190

9.5

7.2

642

103

93

18

4.7

'.3

235

432

7.2

1.3

9.9

812

Ms

--

23

-

116

-

--

'5

-

'356

'7

90

43

~

'33

'2

! .7

635

--

53

0.0002

1,190

10.0

7.1

640

95

94

18

4.8

.2

255

450

7.1

1.3

10

811

9

<1

23

<.5

120

<1

<5

<3

<10

13

<10

92

32

<10

30

2

<1

640

<6

40

'Value is estimated by using a log-probability regression to predict the values of data less than the minimum reporting level (Helsel and Cohn, 1988).

146 Water-Quality Data (July 1994 through September 1996) and Statistical Summaries of Data for Surface Water in the Sand Coulee Coal

Area, Montana

AU.S. GOVERNMENT PRINTING OFFICE: 1998-675-372/85036