Water Level and Purge Data
Copyright © 2018 EarthSoft, Inc • Modified: 12 Dec 2018
EDGE performs calculations during entry of Water Level and Purge data. Auto-population of fields depends on what other data are available in the EDGE EDD; for example, see Warnings on Historical Water Levels for information on exporting the historical data needed for certain checks.
The content of the Water Level Purge and Volume Purge sections in the Ground Water (GW) form can be managed from the Setup icon within the Form tab on the EDGE Ribbon.
To enter data in the Water Level and Purge Data and Purge Information sections, perform the steps below.
1.Create a new record:
a.Field Samples tab: select a sample record, click the Initial Water Level & Purge Data sub-tab, then click Add.
b.FieldSampleForm: Click New on the Form ribbon to create a sample record.
2.Enter the Measurement Time (required field). Note that some data will be automatically populated at this stage.
a.Historical Reference Elevation (from Location data; Location_v1.RefElev)
b.Total Depth of Well (from Location data)
c.Well diameter (from well data; requires selection in the EDGE Field EDD)
3.Enter the Depth to Water and Total Depth of Well (as measured in the field during this event). The Length of Water Column and water level elevation will be calculated automatically. A warning will show if the depth to water is outside of a historical range or is below the bottom of the screen.
4.Enter Depth to LNAPL and/or Depth to DNAPL, if appropriate.
a.Values will be compared to a historical LNAPL range, if available.
b.LNAPL depth will be compared to Depth to Water to calculate the thickness of the LNAPL layer. If LNAPL depth > Depth to Water, warning highlighting will appear on both fields.
5.Select the Depth Unit from the drop-down list.
6.Enter the Diameter of the Well (if not already populated) and select the Diameter Unit from the drop-down list. The Well Volume will be calculated and the Volume Unit will be selected, based on the Depth and Diameter Units. The Volume Unit can be changed with the drop-down list and the Well Volume will be re-calculated.
7.To determine the Calculated Purge Volume, enter the Wells Volumes to Purge. Alternatively, choose other methods to calculate the required purge volume in the Purge Calculation Method field:
a.Casing Volume: described above, uses well data to calculate purge volume.
b.Equipment Volume: Populate tubing length & diameter, Drop tubing length & diameter
c.Well_l/f: The purge volume is calculated using (depth of well-depth to water)*0.03 L/ft
Some of the same procedures, checks and calculations apply to the Water Level tab.
Populate data available from the Location_v1 section of the EDD:
•Location_v1.RefElev > historical_reference_elev
Purge (Initial Water Level & Purge Data Sub-Tab)
1.Populate data if it exists for the sample's location:
a.inner_diameter from historical data
b.depth of well
d.CAS RN for LNAPL present (from historical records)