Table 5. Summary statistics of event-mean concentrations for selected constituents in runoff samples, 2000–2001
[mg/L, milligrams per liter,
µS/cm, microsiemens per centimeter
at 25 degrees Celsius; µg/L,
micrograms per liter; <, less than; --, not determined]
|
Constituent |
Mixed
agricultural (Moody Creek) |
|
Rangeland
(watersheds 1 and 2) |
||||||||
|
No.
of |
Mean |
Median |
Mini- |
Maxi- |
No.
of |
Mean |
Median |
Mini- |
Maxi- |
||
|
Dissolved
solids (mg/L) |
3 |
58 |
56 |
37 |
80 |
|
6 |
74 |
76 |
30 |
116 |
|
Suspended
solids (mg/L) |
3 |
209 |
144 |
38 |
444 |
|
6 |
190 |
75 |
13 |
790 |
|
Specific
conductance (µS/cm) |
3 |
131 |
102 |
100 |
191 |
|
6 |
80 |
71 |
51 |
118 |
|
Nitrogen,
ammonia, dissolved (mg/L) |
4 |
.06 |
.04 |
.03 |
.12 |
|
6 |
.04 |
<.04 |
<.04 |
.07 |
|
Nitrogen,
ammonia + organic, dissolved (mg/L) |
4 |
.77 |
.77 |
.57 |
.98 |
|
6 |
.66 |
.70 |
.28 |
.90 |
|
Nitrogen,
ammonia + organic, total (mg/L) |
4 |
1.8 |
1.8 |
1.7 |
1.9 |
|
6 |
1.3 |
1.1 |
.79 |
3.0 |
|
Nitrogen,
nitrite + nitrate, dissolved (mg/L) |
4 |
.48 |
.47 |
.18 |
.82 |
|
6 |
.18 |
.16 |
.04 |
.33 |
|
Nitrogen,
nitrite, dissolved (mg/L) |
4 |
.02 |
.01 |
.01 |
.03 |
|
6 |
.01 |
.01 |
.004 |
.02 |
|
Nitrogen,
total (mg/L) |
4 |
2.3 |
2.3 |
1.9 |
2.5 |
|
6 |
1.5 |
1.3 |
.92 |
3.2 |
|
Phosphorus,
orthophosphate, dissolved (mg/L) |
4 |
.07 |
.08 |
.04 |
.10 |
|
6 |
.06 |
.04 |
.01 |
.15 |
|
Phosphorus,
dissolved (mg/L) |
4 |
.10 |
.10 |
.07 |
.13 |
|
6 |
.08 |
.06 |
.03 |
.19 |
|
Phosphorus,
total (mg/L) |
3 |
.25 |
.26 |
.19 |
.31 |
|
6 |
.17 |
.13 |
.06 |
.39 |
|
Calcium,
dissolved (mg/L) |
3 |
10 |
10 |
8.3 |
12 |
|
6 |
5.3 |
4.5 |
1.4 |
13 |
|
Magnesium,
dissolved (mg/L) |
3 |
1.6 |
1.4 |
1.3 |
2.0 |
|
6 |
1.1 |
1.2 |
.44 |
1.9 |
|
Sodium, dissolved
(mg/L) |
3 |
9.0 |
5.8 |
5.1 |
16 |
|
6 |
2.4 |
2.0 |
.91 |
4.3 |
|
Potassium,
dissolved (mg/L) |
3 |
5.0 |
5.1 |
4.2 |
5.6 |
|
6 |
5.5 |
6.1 |
2.7 |
7.1 |
|
Chloride,
dissolved (mg/L) |
3 |
12 |
5.3 |
3.7 |
26 |
|
6 |
2.9 |
2.3 |
1.0 |
5.7 |
|
Sulfate,
dissolved (mg/L) |
3 |
6.1 |
4.1 |
3.1 |
11 |
|
6 |
1.9 |
1.3 |
1.1 |
3.8 |
|
Cadmium,
total (µg/L) |
3 |
-- |
.1 |
<.1 |
.12 |
|
6 |
-- |
<.1 |
<.1 |
.24 |
|
Copper, total
(µg/L) |
3 |
<20 |
<20 |
<20 |
<20 |
|
6 |
-- |
<20 |
<10 |
7 |
|
Iron, dissolved
(µg/L) |
3 |
34 |
40 |
22 |
40 |
|
6 |
-- |
27 |
<10 |
50 |
|
Lead, total
(µg/L) |
3 |
-- |
4 |
<1 |
9 |
|
6 |
-- |
<2 |
<1 |
15 |
|
Manganese,
dissolved (µg/L) |
3 |
8.8 |
7.0 |
3.4 |
16 |
|
6 |
-- |
<3 |
<2 |
6.2 |
|
Mercury,
total (µg/L) |
3 |
-- |
<.14 |
<.1 |
.02 |
|
6 |
-- |
<.1 |
<.1 |
.02 |
|
Nickel, total
(µg/L) |
3 |
-- |
2 |
<2 |
5 |
|
6 |
-- |
<2 |
<2 |
8 |
|
Zinc, total
(µg/L) |
3 |
<31 |
<31 |
<31 |
<31 |
|
5 |
-- |
-- |
<25 |
<31 |
|
Oil &
grease, total recoverable (mg/L) |
3 |
-- |
-- |
<1 |
<7 |
|
5 |
-- |
1 |
<1 |
6 |
|
Atrazine
(µg/L) |
3 |
<.007 |
<.007 |
<.007 |
<.007 |
|
5 |
<.007 |
<.007 |
<.007 |
.007 |
|
Deethylatrazine
(µg/L) |
3 |
-- |
<.006 |
<.006 |
.01 |
|
5 |
<.006 |
<.006 |
<.006 |
<.006 |
|
Trifluralin
(µg/L) |
3 |
<.009 |
<.009 |
<.009 |
<.009 |
|
5 |
<.009 |
<.009 |
<.009 |
<.009 |
Contents | Back to Runoff | Table 6