Ground Water Redox Zonation near La Pine, Oregon: Relation to River Position within the Aquifer

Scientific Investigations Report 2007–5239

Appendix A. Project Quality-Control Data, Historical Near-River Ground-Water Data Collected near the Little Deschutes River Near La Pine, Oregon, and Project Discharge and Chemical Data from the Little Deschutes River near La Pine, Oregon, 2006

Project quality-control data are shown in table A1. Geochemical data collected from sediments beneath the Little Deschutes River during October 2000 (Morgan and others, 2007) are shown in table A2.

River discharge was measured, and chemistry data were collected, at five sites along the Little Deschutes River during low-flow conditions October 9–10, 2006 and are listed in table A3 and shown in figure A1. For these discharge measurements, tributary inflows along the studied reaches accounted for less than 0.2 ft³/s. Water samples were collected using isokinetic, depth-integrated, equal-width-increment sampling methods. Collection and processing methods were those described by U.S. Geological Survey (1999). Analytical techniques used were those described by Fishman (1993) and Patton and Kryskalla (2003).

[Standard reference samples prepared by M.C. Doyle, U.S. Geological Survey. Abbreviations: mg/L, milligram per liter; mg N/L, milligram of nitrogen per liter; μg/L, microgram per liter; ‰, per mil; NWQL, National Water Quality Laboratory; –, not collected]

Sample type	Station No.	Date	Time	Chloride(mg/L)	Ammonium(mg N/L)	Nitrite + nitrate(mg N/L)	Iron(μg/L)	δ¹⁵N-NO₃^-(‰)	δ¹⁸O-NO₃^-(‰)
Replicate	434212121295203	10-02-06	1800	6.14	<0.04	1.57	296	–	–
Replicate	434212121295203	10-02-06	1801	6.18	<.04	1.56	287	–	–
Replicate	434212121295203	10-02-06	1802	6.15	<.04	1.55	302	–	–
Standard deviation of replicates				.02	–	.01	8	–	–
Replicate	435014121274900	03-07-06	1000	–	–	–	–	11.9	-1.0
Replicate	435014121274900	03-07-06	1001	–	–	–	–	11.9	-.7
Standard deviation of replicates				–	–	–	–	.0	.2
Equipment blank	–	03-01-06	1508	<.20	<.04	<.016	<6	–	–
Standard reference sample 1
Standard concentration	–	03-01-06	1603	5.20	.53	1.00	–	–	–
Reported by NWQL	–	03-01-06	1603	5.14	.54	.99	–	–	–
Reported concentration, as percentage of standard				98.8	102	99	–	–	–
Standard reference sample 2
Standard concentration	–	03-01-06	1613	11.9	.91	2.78	–	–	–
Reported by NWQL	–	03-01-06	1613	11.0	.93	2.68	–	–	–
Reported concentration, as percentage of standard				92.4	102	96.4	–	–	–
Standard reference sample 3
Standard concentration	–	03-01-06	1623	15.4	1.93	3.06	–	–	–
Reported by NWQL	–	03-01-06	1623	14.5	1.86	2.97	–	–	–
Reported concentration, as percentage of standard				94.2	96.4	97.1	–	–	–

Sample type

Station No.

Date

Time

Chloride(mg/L)

Ammonium(mg N/L)

Nitrite + nitrate(mg N/L)

Iron(μg/L)

δ¹⁵N-NO₃^-(‰)

δ¹⁸O-NO₃^-(‰)

Replicate

434212121295203

10-02-06

1800

6.14

<0.04

1.57

296

–

Replicate

434212121295203

10-02-06

1801

6.18

<.04

1.56

287

–

Replicate

434212121295203

10-02-06

1802

6.15

<.04

1.55

302

–

Standard deviation of replicates

.02

–

.01

–

Replicate

435014121274900

03-07-06

1000

–

11.9

-1.0

Replicate

435014121274900

03-07-06

1001

–

11.9

-.7

Standard deviation of replicates

–

Equipment blank

–

03-01-06

1508

<.20

<.04

<.016

–

Standard reference sample 1

Standard concentration

–

03-01-06

1603

5.20

.53

1.00

–

Reported by NWQL

–

03-01-06

1603

5.14

.54

.99

–

Reported concentration, as percentage of standard

98.8

102

–

Standard reference sample 2

Standard concentration

–

03-01-06

1613

11.9

.91

2.78

–

Reported by NWQL

–

03-01-06

1613

11.0

.93

2.68

–

Reported concentration, as percentage of standard

92.4

102

96.4

–

Standard reference sample 3

Standard concentration

–

03-01-06

1623

15.4

1.93

3.06

–

Reported by NWQL

–

03-01-06

1623

14.5

1.86

2.97

–

Reported concentration, as percentage of standard

94.2

96.4

97.1

–

Table A2. Historical ground-water data for samples collected from sediments beneath the Little Deschutes River, Oregon.

[Historical data from Morgan and others, 2007. Nitrogen samples analyzed by Oregon Department of Environmental Quality, using methods described in Hinkle and others, 2007. River mile, as indicated on U.S. Geological Survey topographic maps. Depth, depth of center of screen below riverbed. Latitude and longitude: North American Datum of 1927 (NAD 27). Abbreviations: LEW, left edge of water looking downstream; mg N/L, milligram of nitrogen per liter; <, less than]

River mile	Sample location	Depth (feet)	Latitude	Longitude	Date	Dominant river bed lithology	Nitrite+ nitrate (mg N/L)	Ammonium (mg N/L)	Hydrogen sulfide odor
7.8	Center of river	1.0	43° 48' 6.2"	121° 27' 10.7"	10-27-00	Sand	<0.005	0.34	Present
9.8	Center of river	3.0	43° 47' 30.2"	121° 27' 29.1"	10-27-00	Sand	<.005	1.6	Present
12.5	Center of river	3.0	43° 46' 41.5"	121° 28' 12.0"	10-27-00	Sand	.006	.44	Present
16.7	Center of river	1.0	43° 44' 58.2"	121° 29' 15.8"	10-26-00	Sand	<.005	1.3	Present
19.1	Center of river	2.0	43° 44' 15.8"	121° 29' 21.4"	10-26-00	Sand	.071	2.3	Present
21.2	Center of river	2.0	43° 43' 32.5"	121° 29' 26.8"	10-26-00	Sand	.006	2.6	Present
24.9	One-fourth of distance across from LEW	3.0	43° 42' 12.3"	121° 29' 52.4"	10-23-00	Gravel	.011	.31	Present
24.9	Center of river	3.0	43° 42' 12.3"	121° 29' 52.4"	10-23-00	Gravel	1.29	<.02	Absent
24.9	Three-fourths of distance across  from LEW	3.0	43° 42' 12.3"	121° 29' 52.4"	10-23-00	Gravel	2.73	<.02	Absent

River mile

Sample location

Depth (feet)

Latitude

Longitude

Date

Dominant river bed lithology

Nitrite+ nitrate (mg N/L)

Ammonium (mg N/L)

Hydrogen sulfide odor

7.8

Center of river

1.0

43° 48' 6.2"

121° 27' 10.7"

10-27-00

Sand

<0.005

0.34

Present

9.8

Center of river

3.0

43° 47' 30.2"

121° 27' 29.1"

10-27-00

Sand

<.005

1.6

Present

12.5

Center of river

3.0

43° 46' 41.5"

121° 28' 12.0"

10-27-00

Sand

.006

.44

Present

16.7

Center of river

1.0

43° 44' 58.2"

121° 29' 15.8"

10-26-00

Sand

<.005

1.3

Present

19.1

Center of river

2.0

43° 44' 15.8"

121° 29' 21.4"

10-26-00

Sand

.071

2.3

Present

21.2

Center of river

2.0

43° 43' 32.5"

121° 29' 26.8"

10-26-00

Sand

.006

2.6

Present

24.9

One-fourth of distance across from LEW

3.0

43° 42' 12.3"

121° 29' 52.4"

10-23-00

Gravel

.011

.31

Present

24.9

Center of river

3.0

43° 42' 12.3"

121° 29' 52.4"

10-23-00

Gravel

1.29

<.02

Absent

24.9

Three-fourths of distance across  from LEW

3.0

43° 42' 12.3"

121° 29' 52.4"

10-23-00

Gravel

2.73

<.02

Absent

Table A3. Discharge measurements and chemical samples collected from Little Deschutes River near La Pine, Oregon, October 2006.

[Total nitrogen and field parameters on unfiltered samples; other analyses on filtered samples. Latitude and longitude: North American Datum of 1927 (NAD 27). Abbreviations: NAVD 88, North American Vertical Datum of 1988; RM, river mile, as indicated on U.S. Geological Survey topographic maps. ft³/s, cubic foot per second; mg/L, milligram per liter; μS/cm, microsiemens per centimeter at 25°C; °C, degrees Celsius; mg N/L, milligram of nitrogen per liter; mg P/L, milligram of phosphorus per liter; <, less than]

Site	Station No.	Date	Time	Latitude	Longitude	Altitude (feet above NAVD 88)	Instantaneous discharge (ft³/s)	Dissolved oxygen (mg/L)	Specific conductance (μS/cm)
RM 37.8	433846121352800	10-09-06	1610	43° 38' 45.7"	121° 35' 28.1"	4,235	30.3	10.2	55
RM 32.6	434022121324600	10-10-06	1110	43° 40' 22.2"	121° 32' 46.5"	4,205	29.5	9.8	57
RM 24.9	434212121295700	10-10-06	1340	43° 42' 12.4"	121° 29' 52.4"	4,195	31.1	10.4	61
RM 16.0	434515121290200	10-10-06	1510	43° 45' 14.7"	121° 29' 02.0"	4,170	33.9	10.6	66
RM 5.4	434917121270000	10-10-06	1720	43° 49' 16.8"	121° 26' 59.8"	4,165	36.9	10.3	68

Site

Station No.

Date

Time

Latitude

Longitude

Altitude
(feet above
NAVD 88)

Instantaneous
discharge
(ft³/s)

Dissolved
oxygen
(mg/L)

Specific
conductance
(μS/cm)

RM 37.8

433846121352800

10-09-06

1610

43° 38' 45.7"

121° 35' 28.1"

4,235

30.3

10.2

RM 32.6

434022121324600

10-10-06

1110

43° 40' 22.2"

121° 32' 46.5"

4,205

29.5

9.8

RM 24.9

434212121295700

10-10-06

1340

43° 42' 12.4"

121° 29' 52.4"

4,195

31.1

10.4

RM 16.0

434515121290200

10-10-06

1510

43° 45' 14.7"

121° 29' 02.0"

4,170

33.9

10.6

RM 5.4

434917121270000

10-10-06

1720

43° 49' 16.8"

121° 26' 59.8"

4,165

36.9

10.3

Site	Station No.	Temperature (°C)	Chloride (mg/L)	Ammonium (mg N/L)	Nitrite+ nitrate (mg N/L)	Nitrite (mg N/L)	Total nitrogen (mg N/L)	Orthophosphate (mg P/L)
RM 37.8	433846121352800	11.5	0.67	<0.02	<0.06	<0.002	0.08	0.039
RM 32.6	434022121324600	7.1	.66	<.02	<.06	<.002	.09	.040
RM 24.9	434212121295700	8.9	.82	<.02	<.06	<.002	.08	.041
RM 16.0	434515121290200	9.7	.95	<.02	<.06	<.002	<.06	.053
RM 5.4	434917121270000	10.3	1.10	<.02	<.06	<.002	.06	.041

Site

Station No.

Temperature
(°C)

Chloride
(mg/L)

Ammonium
(mg N/L)

Nitrite+
nitrate
(mg N/L)

Nitrite
(mg N/L)

Total nitrogen
(mg N/L)

Orthophosphate
(mg P/L)

RM 37.8

433846121352800

11.5

0.67

<0.02

<0.06

<0.002

0.08

0.039

RM 32.6

434022121324600

7.1

.66

<.02

<.06

<.002

.09

.040

RM 24.9

434212121295700

8.9

.82

<.02

<.06

<.002

.08

.041

RM 16.0

434515121290200

9.7

.95

<.02

<.06

<.002

<.06

.053

RM 5.4

434917121270000

10.3

1.10

<.02

<.06

<.002

.06

.041

Figure A1. Spatial patterns of instantaneous discharge, specific conductance, and chloride, Little Deschutes River near La Pine, Oregon, October 9–10, 2006.

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