Table 1. Selected properties and constituents, Lorence Creek and Frio River tributary sites
[mg/L, milligrams per liter; --, no standard; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, less than; mg/L, micrograms per liter; ND, not detected; NA, not analyzed ]
|
Property or constituent |
No. of detections at Lorence Creek site |
Minimum concentration at Lorence Creek site |
Maximum concentration at Lorence Creek site |
Average concentration at Lorence Creek site | Concentration at Frio River tributary site |
Drinking water maximum allowable or recommended concentrations1 |
| pH, lab (standard units) | 8 |
7.3 |
8.3 |
7.8 |
8 |
6.5-8.5 |
| Alkalinity, lab (mg/L) | 8 |
31 |
76 |
50 |
70 |
-- |
| Specific conductance, lab (mS/cm) | 8 |
64 |
100 |
84 |
113 |
-- |
| Suspended sediment (mg/L) | 6 |
12 |
437 |
104 |
200 |
-- |
|
|
|
|
|
|||
| Nitrogen, ammonia, dissolved (mg/L) | 8 |
.04 |
.12 |
.08 |
<.02 |
-- |
| Nitrogen, ammonia plus organic, dissolved (mg/L) | 8 |
.2 |
.6 |
.35 |
.28 |
-- |
| Nitrogen, ammonia plus organic, total (mg/L) | 8 |
.24 |
2 |
.71 |
1.1 |
-- |
| Nitrogen, nitrite, dissolved (mg/L) | 8 |
.01 |
.05 |
.02 |
<.01 |
1 |
| Nitrogen, nitrite plus nitrate, dissolved (mg/L) | 8 |
.19 |
.74 |
.36 |
.3 |
10 |
| Phosphorus, dissolved (mg/L) | 8 |
.05 |
.15 |
.09 |
.06 |
-- |
| Phosphorus, total (mg/L) | 8 |
.08 |
.37 |
.14 |
.23 |
-- |
| Phosphorus, orthophosphate, dissolved (mg/L) | 8 |
.05 |
.17 |
.1 |
.06 |
-- |
|
|
|
|
|
|||
| Calcium, dissolved (mg/L) | 8 |
7.7 |
15 |
12 |
19 |
-- |
| Magnesium, dissolved (mg/L) | 8 |
.27 |
.59 |
.46 |
.88 |
-- |
| Sodium, dissolved (mg/L) | 8 |
.48 |
1.3 |
.92 |
.64 |
-- |
| Potassium, dissolved (mg/L) | 8 |
1.3 |
3.8 |
2.1 |
5 |
-- |
| Chloride, dissolved (mg/L) | 8 |
.82 |
2.5 |
1.4 |
.95 |
250 |
| Sulfate, dissolved (mg/L) | 8 |
.67 |
3.9 |
2.5 |
1.2 |
250 |
| Fluoride, dissolved (mg/L) | 0 |
<.10 |
<.10 |
<.10 |
<.10 |
2 |
| Silica, dissolved (mg/L) | 8 |
1.3 |
6.2 |
2.5 |
8.8 |
-- |
|
|
|
|
|
|||
| Aluminum, dissolved (mg/L) | 8 |
12 |
39 |
21 |
8.8 |
250-200 |
| Antimony, dissolved (mg/L) | 0 |
<1.0 |
<1.0 |
<1.0 |
<1.0 |
6 |
| Arsenic, dissolved (mg/L) | 1 |
<1.0 |
1 |
1 |
<1.0 |
50 |
| Barium, dissolved (mg/L) | 8 |
3.6 |
7.4 |
5.8 |
9.6 |
2,000 |
| Beryllium, dissolved (mg/L) | 0 |
<1.0 |
<1.0 |
<1.0 |
<1.0 |
4 |
| Cadmium, dissolved (mg/L) | 0 |
<1.0 |
<1.0 |
<1.0 |
<1.0 |
5 |
| Chromium, dissolved (mg/L) | 2 |
<1.0 |
1.5 |
1.4 |
<1.0 |
100 |
| Cobalt, dissolved (mg/L) | 0 |
<1.0 |
<1.0 |
<1.0 |
<1.0 |
-- |
| Copper, dissolved (mg/L) | 8 |
1 |
4.3 |
2.3 |
1.1 |
1,000 |
| Iron, dissolved (mg/L) | 8 |
5 |
15 |
9.9 |
8.8 |
300 |
| Lead, dissolved (mg/L) | 0 |
<1.0 |
<1.0 |
<1.0 |
<1.0 |
15 |
| Manganese, dissolved (mg/L) | 8 |
1 |
4.7 |
2.1 |
1 |
50 |
| Molybdenum, dissolved (mg/L) | 0 |
<1.0 |
<1.0 |
<1.0 |
<1.0 |
-- |
| Nickel, dissolved (mg/L) | 0 |
<1.0 |
<1.0 |
<1.0 |
<1.0 |
-- |
| Selenium, dissolved (mg/L) | 0 |
<1.0 |
<1.0 |
<1.0 |
<1.0 |
50 |
| Silver, dissolved (mg/L) | 0 |
<1.0 |
<1.0 |
<1.0 |
<1.0 |
100 |
| Zinc, dissolved (mg/L) | 8 |
3 |
7.4 |
5 |
5.2 |
5,000 |
|
|
|
|
|
|
||
| Alachlor (mg/L) | 1 |
.011 |
.011 |
.011 |
ND |
2 |
| Atrazine (mg/L) | 8 |
.01 |
.24 |
.09 |
.007 |
3 |
| Azinphos-methyl (mg/L) | 1 |
.042 |
.042 |
.042 |
.054 |
-- |
| Benfluralin (mg/L) | 1 |
.0042 |
.0042 |
.0042 |
ND |
-- |
| Carbaryl (mg/L) | 4 |
.044 |
.19 |
.1 |
ND |
-- |
| Chlorpyrifos (mg/L) | 6 |
.008 |
.023 |
.013 |
ND |
-- |
| DCPA (mg/L) | 3 |
.0009 |
.01 |
.0043 |
ND |
-- |
| DDE (mg/L) | 2 |
.0024 |
.0032 |
.0028 |
ND |
-- |
| Deethylatrazine (mg/L) | 6 |
.0028 |
.029 |
.0081 |
.001 |
-- |
| Diazinon (mg/L) | 7 |
.03 |
.53 |
.17 |
ND |
-- |
| DNOC (mg/L) | 1 |
.13 |
.13 |
.13 |
ND |
-- |
| Malathion (mg/L) | 3 |
.006 |
.059 |
.026 |
ND |
-- |
| MCPA (mg/L) | 2 |
.16 |
.24 |
.2 |
ND |
-- |
| Metolachlor (mg/L) | 2 |
.006 |
.012 |
.009 |
ND |
-- |
| Metribuzin (mg/L) | 1 |
.014 |
.014 |
.014 |
ND |
-- |
| Prometon (mg/L) | 2 |
.0045 |
.0069 |
.0057 |
ND |
-- |
| Propargite (mg/L) | 1 |
.03 |
.03 |
.03 |
ND |
-- |
| Simazine (μg/L) | 4 |
.008 |
.19 |
.06 |
ND |
-- |
| Trifluralin (mg/L) | 1 |
.0042 |
.0042 |
.0042 |
ND |
-- |
|
|
|
|
|
|||
| 1,2,4-Trimethylbenzene (mg/L) | 2 |
.018 |
.023 |
.025 |
NA |
-- |
| Acetone (mg/L) | 1 |
5.3 |
5.3 |
5.3 |
NA |
-- |
| Benzene (mg/L) | 1 |
.015 |
.015 |
.015 |
NA |
5 |
| Ethylbenzene (mg/L) | 1 |
.01 |
.01 |
.01 |
NA |
700 |
| Methyl isobutyl ketone (mg/L) | 1 |
.23 |
.23 |
.23 |
NA |
-- |
| Xylenes (mg/L) | 1 |
.013 |
.013 |
.013 |
NA |
10,000 |
1 U.S. Environmental Protection Agency, 1999b.
2 50 mg/L is the recommended standard; 200 mg/L is an acceptable standard.
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