Oasis Well Pumping TestMay 2018Observations and Insights.

by

Joe C. Yelderman Jr.

Test preparation was a large effort by a

“community”

The Pumping

well

Water Quantity

Water Levels Flow Rate

Water Quality

Spot check Continuous flow data

AnObservation

well

The Community

• CUWCD District/management

• Oasis LLC Client

• Water suppliers Industry

• Baylor University Education (research)

Baylor University Students

• Hands-on experience

• Real-world activities

• Professional interaction

Pumping WellDrawdown

• Temperature effects

• Fairly straight line

• Pumping variations

• Follows the model ?

Pumping WellDrawdown

• Aquifer Transmissivity

• 1 – 200,000 gpd/ft

• 2 – 125,000 gpd/ft• < 5,000 ft?

• Acres Well – 75,000 gpd/ft• > 35,000 ft.

12

Specific ConductanceuS/cm

Spc was measured using a YSI Pro 30 meter

and

A hobo conductivity data logger

The YSI is considered the accurate measurement and the data logger is experiencing drift.

Temperature measurements did not show drift on the datalogger like the Spc.

Therefore, water quality did not appear to change over the pumping period.

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Hobo Datalogger YSI Meter Linear (Hobo Datalogger) Linear (YSI Meter)

Water Chemistry during the Test

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TDS Sulfate Nitrate

Date TDSmg/l

Sulfatemg/l

Nitratemg/l

4/30/2018 922 222 0.007

5/01/2018 945 220 0.007

5/31/2018 942 231 0.009

Isotopes

2H and 16O

Baylor University Report Date: 5/22/2018 Material Received: 5/14/2018 Sample Data pMC F14C d13C o/oo d18O o/oo dD o/oo Beta - 494283 < 0.44 pMC < 0.0044 -8.0 -5.3 -34.59 JHW AMS-Standard delivery MATERIAL/PRETREATMENT: (water DIC) acidify-gas strip COMMENTS: The equivalent "Apparent" radiocarbon age to the reported pMC/fMDN values is ~ > 43500 BP BP (not adjusted for any hydro-geochemical effects on meteoric water 14CO2). Given the complex nature of groundwater DIC14 chemistry, duplicate measurements within 1-2 pMC are reasonable for a single water sample. For very low DIC concentration waters (< 20 mg/L HCO3) DIC14 and waters with complex organic chemistry, results can vary significantly outside of this expectation.

TRINITY OASIS WATER APPARENT AGE

TRINITY OASIS LLC

INSIGHTS

1. WE KNOW MORE ABOUT THE LOWER TRINITY AQUIFER IN BELL COUNTY THAN EVER BEFORE2. BOUNDARIES OCCUR BUT THEY APPEAR SEMI-PERMEABLE AND LOCATIONS ARE NOT EXACT3. THE PUMPING WELL IS IN A MORE PRODUCTIVE AREA THAN MOST OF THE AQUIFER4. THE WATER CHEMISTRY REMAINED CONSISTENT THROUGHOUT THE TEST5. THE WATER IS QUITE OLD AND NOT BEING RECHARGED FROM CURRENT RAINFALL6. COOPERATIVE EFFORTS BY THE GROUNDWATER “COMMUNITY” IN BELL COUNTY MADE THIS A SUCCESS

AQUIFER TEST