WSP04065

• File Number: 8200.100.10
• Description: Colorado River Basin - Description - Meteorologic-Climate Data
• State: CO
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 1/1/1997
• Author: USGS
• Title: Precipitation-Chemistry Data at Selected Sites in Northwestern Colorado - 1980-1994
• Water Supply Pro - Doc Type: Report/Study

,

Table 4. Summary statistics of specific conductance and concentrations of dissolved ions at Grand Mesa, 1981-s1
[Specific conductance in microsiemcns per centimeter at 25 degrCC"J Celsius; dissolved ions in microcquivalents per liter]
Specllic Hydrogen Calcium Magnesium Sodium Potaaslum Ammonium ehlorlde Nitrate Sultata c,;,
conductance ltn (ea21 (Mg2+) (Na1 (K+) (NH.c+) (CI1 (NO.1 (SOl') (.;;)
Number of 238 238 223 222 223 211 171 233 223 233 Q
samples ~
Co,)
Mean 9.1 7.6 24.7 4.3 5.4 1.8 12.5 5.1 15.3 20.1 c:>
Median 7.4 5.2 13.5 3.3 0.43 1.0 10.0 3.4 12.7 16.4
Standard 7.1 8.4 56.8 4.3 4.7 4.8 15.3 7.2 12.4 15.1
deviation
Minimwn 1.3 0.1 0.2 0.4 0.2 0.1 0.7 0.1 0.6 0.8
Maximum 60.6 60.3 798.4 26.3 33.1 58.8 157.1 91.1 124.8 119.7

Table 5. Precipitation volume, specific conductance, concentrations of dissolved ions, and percent charge balance for each sampling intel'lal at MalVine Ranch,
1981-s4

[Precipitation volwnc in inches~ specific conductance in microsiemens per centimeter at 25 degrees Celsius~ dissolved ions in microequivalents per liter, ._, no data}

Beginning
date

Precip-
Itation

"
"
m
o
'ii
~
::I
o
z
o
~
J>

04/24/81
05120/81
07/01/81
07110/81
08110/81
08112181
08/14/81
09/01/81
09103/81
10/07/81
10/29/81
12101/81
12115/81
12119/81
12122181

..
co

Ending
date

OS/20/81
OS/27/81
07/10/81
07/27/81
08112181
08/14/81
09/01/81
09/03/81
10/07/81
10/29/81
12101/81
12115/81
12119/81
12122181
12126181

2.98
0.93
1.15
1.26
0.24

1.08
0.15
2.03
2.81
2.47
0.51
0.49
0.99
1.04

Speclllc
conduct-
ance
7.8
8.8
7.9
11.1
8.7
8.6
17.4
11.8
12.5
7.0
13.5
13.7
4.0
6.2
3.4

Hydro-
gen
(tn'
3.4
13.8
11.5
18.2
16.6
14.5
32.4
12.6
2.8
7.8
1.3
40.7
4.7
14.1
10.0

Calcium
(Ca'+)

20.0
20.0
10.0
18.5
15.0

11.5
21.0
15.5
23.0
17.0
11.0
24.0
9.0
12.5

Magne-
sium
(Mg")
0.4
0.4
0.4
7.4
4.9

3.3
11.5
4.1
4.1
4.1
4.1
4.1
1.6
2.5

Sodium
(No+)

30.5
34.8
26.1
3.5
4.4

0.9
17.4
2.2
3.0
2.2
2.2
5.2
3.0
1.3

Potas-
sium
(K1
2.6
2.6
2.6
1.3
2.6

Ammo-
nium
(NH.1
10.7
17.1
15.7

0.5
2.0
1.0
1.0
1.0
1.0
1.0
0.3
0.5

Chlorlda
(en

13.5
2.5
6.8
3.7
7.9
7.6
3.1
13.0
2.0
2.3
1.4
2.5
3.4
3.1
2.5

Nltra18
(NO.1

15.0
15.0
12.9
24.2
16.5
15.6
22.6
22.6
16.1
10.5
11.5
21.0
5.5
8.5
8.2

Sulfate
(SOl1

28.5
35.0
17.9
25.0
17.9
17.9
43.7
31.2
25.0
25.0
12.3
22.9
8.5
4.8
4.4

Percent
charge
balance
8.5
25.6
27.6

Sum
cations

Sum
anions

67.6
88.7
66.3

57.0
52.5
37.6
52.9
42.3
41.1
69.4
66.8
43.1
37.8
25.2
46.4
17.4
16.4
15.1