USGS Water-Year Summary 2023

465652094394501 MW-01 UMN Hydrogeology Field Site 0000569489

Glacial Surficial Sand and/or Gravel

LOCATION - Lat 46°56'52.45", long 94°39'47.79" referenced to North American Datum of 1983, in N 1/4 NE 1/4 NE 1/4 sec.13, T.140 N., R.32 W., Hubbard County, MN, Hydrologic Unit 07010102, The well is located approximately 4.9 miles SE of Akeley, MN. The well is located in an open area in the forest, between Williams Lake and Crystal Lake. The well is located approximately 0.8 miles SW of the intersection of MN HWY 12 (Lower 10 Mile Lake Rd. NW) and 72nd Ave. NW.

GROUNDWATER RECORDS

WELL CHARACTERISTICS - Depth 85 ft. Upper casing diameter UPPERCASINGDIAMETER; top of first opening OPENTOPVALUE, bottom of last opening OPENBOTTOMVALUE.

The hole for well MW-01 was drilled with an 6.2-inch-diameter, hydraulic rotary drill rig to a depth of 85 feet. The well is constructed of a 5-feet-long, 2.04-inch-diameter, schedule-40 PVC, (unknown)-inch slotted, (unknown make) well screen, attached to length/s of 2.04-inch-diameter, schedule-40 PVC well casing. The well casing measuring point (stickup) was 2.73 feet (1456.27 ft. NAVD88, +/- 0.01 ft.) above land surface when measured on 21 July 2017. The open interval of the well is between 80 and 85 feet below land surface and the total well depth is 85 feet below land surface.

This well is open to the same surficial unconfined aquifer from which nearby pumping occurs once per year (July) during the University of Minnesota's Hydrogeology Field Camp.

DATUM - Land-surface datum is 1,453.54 ft above North American Vertical Datum of 1988. Measuring point: MEASURINGPOINT. The measuring point is a black mark on the top of the white PVC 2.04-inch well casing, which was 2.73 feet above land surface on 21 Jul. 2017. Elevation of the measuring point is 1456.27 plus-or-minus 0.01 feet above sea level, North American Vertical Datum of 1988, based on historical differential GPS data and an optical survey on 20 July 2017.

PERIOD OF RECORD -

Water levels were recorded periodically from 07 July 2017 to 11 October 2018. Water levels were recorded hourly from 11 September 2017 at 16:00 CDT to 17 July 2018 at 15:00 CDT. Water levels were recorded quarter-hourly from 17 July 2018 at 15:52 CDT to 31 July 2018 at 14:01 CDT. Water levels were recorded hourly from 31 July 2018 at 15:00 CDT to 11 October 2018 at 09:00 CDT, except during the following periods:

05 Oct. 2017 at 11:00 CDT: due to completing slug test in the well during this period.

21 Jul. 2018 at 14:41 CDT - 20 Aug. 2018 at 10:00 CDT: due to water level being affected by aquifer test at the site.

GAGE - Continuous water level, water temperature, and battery voltage were measured with an OTT Orpheus Mini 0-10m pressure transducer. These data were recorded hourly by the same OTT Orpheus Mini pressure transducer, which had a data logger built into it. The data logger was housed inside of the 2.04-inch PVC well casing, which had an aluminum locking well cap on top the 6-inch black steel protection post. The gage was powered by 3 AA alkaline batteries that were inside of the data logger communications rod. Data were downloaded manually and no telemetry or phone line were wired into the gage.

An unheated Onset RG3 tipping-bucket rain gage (SN: 10160282) was added to the station during 01 June 2017 at 12:45 CDT to 11 October 2018 at 09:30 CDT. The rain gage is mounted on a wooden 4x4 post, located approximately 35 ft. northeast of well MW-01. The rain gage had a built-in data logger, which measured and recorded precipitation quarter-hourly. Rain gage was nominally accurate to 0.01 inches.

COOPERATION - This site was operated (2017-2018) by the University of Minnesota as a monitoring well for the University of Minnesota Hydrogeology Field Site. The well was used as part of the Glacial Confining Beds Study during 01 Jun. 2017 to 11 Oct. 2018. The Confining Beds Study was a collaborative effort between the Environment and Natural Resources Trust Fund, Iowa State University, Minnesota Geological Survey, and the U.S. Geological Survey.

CLIMATOLOGICAL RECORDS

PERIOD OF RECORD -

Precipitation were recorded quarter-hourly from 01 June 2017 at 12:45 CDT to 11 October 2018 at 09:30 CDT, except during the following periods:

20 Jul. 2017 at 08:45-08:00 CDT: deleted rainfall due to false tips during rain gage inspection and cleaning.

07 Aug. 2017 at 14:30 CDT: deleted rainfall due to false tips during rain gage inspection.

INSTRUMENTATION -

Precipitation is measured with an Onset RG3 tipping-bucket rain gage, which is accurate to 0.01 inches. The rain gage is unheated and uncovered during the winter. Thus precipitation data during freezing periods (about December through early April) result from melting of snow during warm periods and do NOT represent actual precipitation.

WATER-QUALITY RECORDS

WELL CHARACTERISTICS - Depth 85 ft. Upper casing diameter UPPERCASINGDIAMETER; top of first opening OPENTOPVALUE, bottom of last opening OPENBOTTOMVALUE.

The hole for well MW-01 was drilled with an 6.2-inch-diameter, hydraulic rotary drill rig to a depth of 85 feet. The well is constructed of a 5-feet-long, 2.04-inch-diameter, schedule-40 PVC, (unknown)-inch slotted, (unknown make) well screen, attached to length/s of 2.04-inch-diameter, schedule-40 PVC well casing. The well casing measuring point (stickup) was 2.73 feet (1456.27 ft. NAVD88, +/- 0.01 ft.) above land surface when measured on 21 July 2017. The open interval of the well is between 80 and 85 feet below land surface and the total well depth is 85 feet below land surface.

This well is open to the same surficial unconfined aquifer from which nearby pumping occurs once per year (July) during the University of Minnesota's Hydrogeology Field Camp.

DATUM - Land-surface datum is 1,453.54 ft above North American Vertical Datum of 1988. Measuring point: MEASURINGPOINT. The measuring point is a black mark on the top of the white PVC 2.04-inch well casing, which was 2.73 feet above land surface on 21 Jul. 2017. Elevation of the measuring point is 1456.27 plus-or-minus 0.01 feet above sea level, North American Vertical Datum of 1988, based on historical differential GPS data and an optical survey on 20 July 2017.

PERIOD OF RECORD -

Water temperatures were recorded hourly from 11 September 2017 at 16:00 CDT to 17 July 2018 at 15:00 CDT. Water temperatures were recorded quarter-hourly from 17 July 2018 at 15:52 CDT to 31 July 2018 at 14:01 CDT. Water temperatures were recorded hourly from 31 July 2018 at 15:00 CDT to 11 October 2018 at 09:00 CDT, except during the following periods:

05 Oct. 2017 at 11:00 CDT: due to completing slug test in the well during this period.

17 Jul. 2018 at 15:35-15:51 CDT: due to WT spike during site visit.

18 Jul. 2018 at 12:25-12:26 CDT: due to WT spike during site visit.

31 Jul. 2018 at 14:03-14:07 CDT: due to WT spike during site visit.

COOPERATION - This site was operated (2017-2018) by the University of Minnesota as a monitoring well for the University of Minnesota Hydrogeology Field Site. The well was used as part of the Glacial Confining Beds Study during 01 Jun. 2017 to 11 Oct. 2018. The Confining Beds Study was a collaborative effort between the Environment and Natural Resources Trust Fund, Iowa State University, Minnesota Geological Survey, and the U.S. Geological Survey.

INSTRUMENTATION - Water temperature is measured with an OTT Orpheus Mini submersible pressure transducer accurate to +/- 0.1°C. Temperature differences are accurate to 0.1°C.