Table 1. Selected chemical and isotopic analyses and proportions of water attributed to each end-member at the North Farm and Terrace Farm sites, Umatilla River basin, Oregon.
[Abbreviations: USGS, U.S. Geological Survey; m, meter; mg/L, milligram per liter; ‰, per mil; –, not determined; NA, not available; >, greater than]
| USGS station
No. |
Well
identification
No. |
Elevation of water table (m) |
Top of screen in relation to water level (m) |
NO3 (mg/L) |
δ15N (‰) |
δ18O (‰) |
Tritium (TU) |
Recharge age (years) |
Proportion of water from each end member |
| Upgradient ground water |
Western ground water affected by irrigation canal leakage |
Terrace Farm water |
| Terrace Farm site |
| 454625119192101 |
MW-14 |
170.5 |
-7.7 |
41.5 |
4.87 |
-3.82 |
0.05 |
48.9 |
0.11 |
0.89 |
0.00 |
| 454604119195501 |
MW-22 |
173.9 |
– |
30.1 |
4.49 |
-3.01 |
– |
– |
.01 |
.99 |
.00 |
| 454636119184101 |
MW-38 |
171.6 |
.5 |
14.7 |
3.54 |
-2.91 |
– |
– |
.64 |
.31 |
.05 |
| 454612119184101 |
MW-39 |
179.2 |
-4.8 |
13.4 |
7.55 |
-5.80 |
.92 |
1.9 |
1.00 |
.00 |
.00 |
| 454546119181401 |
MW-40 |
181.2 |
-3.9 |
28.9 |
8.51 |
-5.99 |
.43 |
2.6 |
.92 |
.08 |
.00 |
| 454551119201001 |
MW-51 |
176.4 |
.6 |
9.95 |
4.39 |
-2.16 |
– |
– |
.58 |
.00 |
.42 |
| 454628119195301 |
MW-52 |
170.2 |
.8 |
36.1 |
4.24 |
-2.10 |
– |
– |
.00 |
1.00 |
.00 |
| 454638119190901 |
MW-53 |
166.6 |
.2 |
53.5 |
2.36 |
-2.06 |
4.03 |
1.6 |
.00 |
.00 |
1.00 |
| 454546119193901 |
MW-54 |
177.8 |
-.5 |
22.0 |
6.27 |
-4.12 |
– |
– |
.19 |
.81 |
.00 |
| 454700119193501 |
Terrace-1 |
165.8 |
-2.1 |
46.1 |
5.87 |
-2.87 |
4.58 |
7.8 |
– |
– |
– |
| 454657119192501 |
Terrace-2 |
165.8 |
-3.4 |
30.6 |
4.62 |
-3.25 |
2.8 |
8.2 |
.15 |
.82 |
.03 |
| 454656119190801 |
Terrace-3 |
165.9 |
-2.5 |
28.2 |
4.56 |
-3.42 |
– |
– |
.24 |
.72 |
.04 |
| North Farm site |
| 455128119224901 |
MW-3 |
171.9 |
-17.1 |
8.58 |
3.40 |
-4.08 |
– |
– |
| 455150119221901 |
MW-4 |
172.1 |
-17.9 |
25.9 |
4.95 |
-3.53 |
– |
– |
| 455128119224301 |
MW-101 |
171.6 |
-3.1 |
48.0 |
6.27 |
-3.06 |
6.7 |
5 |
| 455100119234101 |
MW-331 |
156.8 |
-7.7 |
15.4 |
4.20 |
-5.40 |
.04 |
>50 |
| 455104119235401 |
MW-34 |
155.1 |
-5.1 |
13.9 |
– |
– |
– |
– |
| 455102119235501 |
MW-35 |
154.7 |
-2.9 |
10.3 |
– |
– |
– |
– |
| 455106119234901 |
MW-36 |
156.7 |
-5.5 |
14.1 |
– |
– |
– |
– |
| 455111119235401 |
11-1 |
156.3 |
-4.0 |
16.6 |
– |
– |
– |
– |
| 455046119235001 |
11-2 |
153.8 |
1.0 |
17.7 |
– |
– |
– |
– |
| 455058119232401 |
11-31 |
160.9 |
-1.7 |
12.5 |
4.52 |
-4.96 |
.04 |
>50 |
| 455115119232401 |
11-4 |
164.3 |
-5.0 |
10.2 |
1.87 |
-5.67 |
– |
| 455106119234401 |
11-5 |
157.8 |
-5.7 |
11.9 |
– |
– |
– |
– |
| 455054119242101 |
11-6 |
153.2 |
-.2 |
11.0 |
– |
– |
– |
– |
| 455058119240701 |
11-71 |
154.5 |
-1.6 |
14.9 |
6.24 |
-6.33 |
.07 |
>50 |
| 455107119240701 |
11-8 |
154.9 |
-1.0 |
13.6 |
– |
– |
– |
– |
| 455045119240801 |
11-9 |
154.0 |
.1 |
13.6 |
4.06 |
-6.56 |
– |
– |
| 455040119235701 |
11-10 |
153.9 |
-.7 |
6.29 |
3.07 |
-5.39 |
– |
– |
|
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U.S. Department of the Interior | U.S. Geological Survey