USGS Water-Year Summary 2024

473426095052305 533E Bemidji Toxics Research Site

Sand and gravel aquifers (glaciated regions)
Glacial Surficial Sand and/or Gravel

LOCATION - Lat 47°34'25.81", long 95°05'23.81" referenced to North American Datum of 1983, Beltrami County, MN, Hydrologic Unit 07010101, The well is located approximately 11 miles NW of Bemidji, MN and 2.4 miles SE of Pinewood, MN. 

GROUNDWATER RECORDS

WELL CHARACTERISTICS - Depth 33.43 ft. Upper casing diameter 2.04 in; top of first opening 32.51 ft, bottom of last opening 33.01 ft. Well 533E is a groundwater observation well that was drilled on 12 Aug. 1996 with a 7.25-inch-diameter, with an unknown drill rig to a unknown borehole depth. The well is constructed of a 0.5-feet-long, 2.04-inch-diameter, schedule-40, galvanized steel, 0.010-inch slotted, well screen, attached with to length/s of 2.04-inch-diameter, schedule-40 galvanized steel well casing. The well casing measuring point (stickup) was 1.39 feet (1421.69 ft. NAVD88, +/- 0.01 ft.) above land surface when measured on 22 Jul. 2013. The open interval of the well is between 32.51 and 33.01 feet below land surface and the total well depth is 33.43 feet below land surface.

DATUM - Land-surface datum is 1,420.3 ft above North American Vertical Datum of 1988. Measuring point: Initial MP for this well. Discovered to be inaccurate and MP was created, 1.76 ft above land-surface datum, Aug. 12, 1996 to Aug. 13, 1996; More accurate MP length. This should be used for all water level measurements at well, 1.39 ft above land-surface datum, Aug. 13, 1996 to present. The measuring point is a black mark on the top of the 2-inch PVC well casing, and was 1.39 feet above land surface on 22 Jul. 2013. Elevation of the measuring point is 1421.69 plus-or-minus 0.01 feet above sea level, North American Vertical Datum of 1988, based on differential GPS Survey on 25 October 2010.

PERIOD OF RECORD - Water levels were recorded periodically from 18 August 2004 to the present.

GAGE -

On 18 Oct. 2019, a Campbell Scientific, Inc. CS547A-L specific conductance and water temperature sensor was installed in the well and wired into a nearby Campbell Scientific, Inc. CR1000 datalogger. This sensor is hanging at 33.0 ft. BLS in the well. All of these data are recorded half-hourly by the CR1000 datalogger at site 1402G (USGS 473426095052447). The CS547A-L sensor cable is buried in PVC pipe that runs from well 533E to site 1402G, where the CR1000 datalogger, power, and telemetry equipment is installed. Well 533E is approximately 40 ft. northeast of site 1402G.

COOPERATION - Well 533E is operated in cooperation with the U.S. Geological Survey's Toxic Substances Hydrology Program, Minnesota Pollution Control Agency, Enbridge Energy Inc., and Beltrami County. This well is located at the National Crude-Oil Spill Research Site near Bemidji, Minnesota.

WATER-QUALITY RECORDS

WELL CHARACTERISTICS - Depth 33.43 ft. Upper casing diameter 2.04 in; top of first opening 32.51 ft, bottom of last opening 33.01 ft. Well 533E is a groundwater observation well that was drilled on 12 Aug. 1996 with a 7.25-inch-diameter, with an unknown drill rig to a unknown borehole depth. The well is constructed of a 0.5-feet-long, 2.04-inch-diameter, schedule-40, galvanized steel, 0.010-inch slotted, well screen, attached with to length/s of 2.04-inch-diameter, schedule-40 galvanized steel well casing. The well casing measuring point (stickup) was 1.39 feet (1421.69 ft. NAVD88, +/- 0.01 ft.) above land surface when measured on 22 Jul. 2013. The open interval of the well is between 32.51 and 33.01 feet below land surface and the total well depth is 33.43 feet below land surface.

DATUM - Land-surface datum is 1,420.3 ft above North American Vertical Datum of 1988. Measuring point: Initial MP for this well. Discovered to be inaccurate and MP was created, 1.76 ft above land-surface datum, Aug. 12, 1996 to Aug. 13, 1996; More accurate MP length. This should be used for all water level measurements at well, 1.39 ft above land-surface datum, Aug. 13, 1996 to present. The measuring point is a black mark on the top of the 2-inch PVC well casing, and was 1.39 feet above land surface on 22 Jul. 2013. Elevation of the measuring point is 1421.69 plus-or-minus 0.01 feet above sea level, North American Vertical Datum of 1988, based on differential GPS Survey on 25 October 2010.

PERIOD OF RECORD -

Water quality samples have been collected periodically from 14 Jul. 1999 to the present.

Water temperature (33.0 ft. BLS):

Water temperature was recorded half-hourly from 18 Oct. 2019 at 14:00 CDT to the present, except during the following periods:

06 Aug. 2020 at 22:30 CDT - 01 Sept. 2020 at 16:30 CDT: due to failed thermistor sensor.
01 Feb. 2021 at 16:00 CST - 02 Feb. 2021 at 08:00 CST: due to datalogger recording bad data caused by a disconnected wire.
21 Oct. 2023 at 16:30 CDT - 22 Oct. 2023 at 04:00 CDT: due to datalogger not recording during telemetry equipment update.
11 Aug. 2024 at 15:30 CDT - 15 Aug. 2024 at 11:30 CDT: due to AC power failure at datalogger during a thunderstorm on 08/05/24.
29 Sept. 2024 at 08:00 CDT - 16 Oct. 2024 at 13:30 CDT: due to failing thermistor sensor.

Specific Conductance, uS/cm, (33.0 ft. BLS):

Specific conductance was recorded half-hourly from 18 Oct. 2019 at 14:00 CDT to the present, except during the following periods:

18 Oct. 2019 at 14:00 CDT - 19 Oct. 2019 at 11:00 CDT: due to deleting an equilibration curve after deploying the sensor.
22 Apr. 2020 at 17:00 CDT - 23 Apr. 2020 at 00:00 CDT: due to deleting an equilibration curve after site inspection.
05 Aug. 2020 at 12:30 CDT - 06 Aug. 2020 at 00:30 CDT: due to deleting an equilibration curve after site inspection.
06 Aug. 2020 at 22:30 CDT - 01 Sept. 2020 at 19:00 CDT: due to failed specific conductance sensor.
28 Oct. 2020 at 10:00-22:00 CDT: due to deleting an equilibration curve after site inspection.
01 Feb. 2021 at 16:00 CST - 05 Feb. 2021 at 19:30 CST: due to deleting an equilibration curve after site inspection and the datalogger recording bad data caused by a disconnected wire.
28 Apr. 2021 at 14:30 CDT - 29 Apr. 2021 at 01:00 CDT: due to deleting an equilibration curve after site inspection.
28 Jul. 2021 at 13:00 CDT- 29 Jul. 2021 at 05:00 CDT: due to deleting an equilibration curve after water quality sampling.
19 Aug. 2021 at 12:00-21:30 CDT: due to deleting an equilibration curve after site inspection.
27 Apr. 2022 at 09:30-22:00 CDT: due to deleting an equilibration curve after site inspection.
25 Aug. 2022 at 12:00 CDT - 26 Aug. 2022 at 00:00 CDT: due to deleting an equilibration curve after water quality sampling.
23 Jan. 2023 at 15:30 CST - 24 Jan. 2023 at 00:30 CDT: due to deleting an equilibration curve after site inspection.
25 Apr. 2023 at 14:30-22:30 CDT: due to deleting an equilibration curve after site inspection.
22 Jun. 2023 at 12:00 CDT - 01 Jul. 2023 at 14:30 CDT: due to deleting an equilibration curve after water quality sampling.
24 Jul. 2023 at 15:30-15:00 CDT: due to deleting an equilibration curve after site inspection.
21 Oct. 2023 at 15:00 CDT - 22 Oct. 2023 at 12:00 CDT: due to deleting an equilibration curve after site inspection.
01 Feb. 2024 at 15:00 CST - 02 Feb. 2024 at 13:00 CST: due to deleting an equilibration curve after site inspection.
22 Jul. 2024 at 13:30 CDT - 26 Jul. 2024 at 04:30 CDT: due to deleting an equilibration curve after water quality sampling.
06 Aug. 2024 at 09:00 CDT - 07 Aug. 2024 at 02:00 CDT: due to deleting an equilibration curve after site inspection.
11 Aug. 2024 at 15:30 CDT - 15 Aug. 2024 at 11:30 CDT: due to AC power failure at datalogger during a thunderstorm on 08/05/24.
29 Sept. 2024 at 08:00 CDT - 16 Oct. 2024 at 13:00 CDT: due to failing specific conductance sensor.
16 Oct. 2024 at 14:00 CDT - 02 Nov. 2024 at 17:00 CDT: due to deleting a prolonged equilibration curve after sensor replacement.

COOPERATION - Well 533E is operated in cooperation with the U.S. Geological Survey's Toxic Substances Hydrology Program, Minnesota Pollution Control Agency, Enbridge Energy Inc., and Beltrami County. This well is located at the National Crude-Oil Spill Research Site near Bemidji, Minnesota.

INSTRUMENTATION - Specific conductance data (uS/cm) (33.0 ft. BLS) are currently measured with a Campbell Scientific, Inc. CS547A-L conductance/temperature sensor during 18 Oct. 2019 at 14:00 CDT to the present, which are accurate to ±5%.

Water temperatures (33.0 ft. BLS) are currently measured with a Campbell Scientific, Inc. CS547A-L conductance/temperature sensor during 18 Oct. 2019 at 13:00 CDT to the present, which are accurate to ±0.3°C, due to noisiness of the water temperature record. Differences in temperature are also accurate to 0.3°C.