This layer provides study locations that were visited Summer 2021, Summer 2022, and Fall 2022. The attributes in this layer provide the following information:

site_id: Unique field site identifier designated by USF ERG. Points with the same site_id indicate revisited sites.

field_id: Water sample and field site identification assigned to field data collection events by USF ERG.

wtr_sample: “Yes” if water was sampled for this point, or “no” if water was not sampled at this point.

wtr_source: Description of source observed at a given location.

(1) “spring” if source was a spring or springbox.

(2) “seep” if source was a seep.

(3) “well” if source was a water supply well.

(4) “otr_ponded” if source was surface water without flow.

(5) “otr_flow” if source was surface water with flow.

(6) “bcro” if source was the Bridge Creek Reservoir Outlet.

(7) “bcr” if source was the Bridge Creek Reservoir surface water.

(8) “na_pressure_transducer” if this was the location of a pressure transducer

(9) “na_soil” if dominant soils were classified at source.

(10) “na” if none of the above apply.

DisVal: Validation of the groundwater discharge geospatial layer.

(1) “TP” if this location was a true positive

(2) “TN” if this location was a true negative

(3) “FP” if this location was a false positive

(4) “FN POWERLINE DEPRESSION” if this location was a false negative due to a depression caused by a powerline.

(5) “FN EXCAVATED” if this location was a false negative due to an excavated land surface.

(6) “TP SPRING IS 80FT N” if this location was a true positive, but the spring box is located 80 feet north.

date: The calendar date this point was visited.

time: The time this point was visited.

lat: The latitude of this location.

long: The longitude of this location.

elevation_ft: The elevation in feet of the point from a 10x10 ft pixel sized digital elevation model (DEM).

temp_c: The water temperature in Celsius measured at this point using an Oakton pH 300 (Environmental Express, Charleston, SC) or the equivalent and a YSI Model 30 (YSI, Yellow Springs, OH) or the equivalent.

ph: The pH of the water measured using an Oakton pH 300 (Environmental Express, Charleston, SC) or the equivalent.

spec_cond_us_cm: The specific conductance in µS/cm of the water measured using a YSI Model 30 (YSI, Yellow Springs, OH) or the equivalent.

mg_mg_l: The magnesium concentration of water sampled at this point analyzed at the USF Center for Geochemical Analysis with a PerkinElmer Avio 200 ICP-OES with ESI FAST SC-DX-2 Autosampler (PerkinElmer, Waltham, MA).

ca_mg_l: The calcium concentration of water sampled at this point analyzed at the USF Center for Geochemical Analysis with a PerkinElmer Avio 200 ICP-OES with ESI FAST SC-DX-2 Autosampler (PerkinElmer, Waltham, MA).