Oasis Well Pumping Test May 2018 Observations and Insights. by - PowerPoint PPT Presentation

Oasis Well Pumping Test May 2018 Observations 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

An Observation well

The Community • CUWCD District/management • Oasis LLC Client • Water suppliers Industry • Baylor University Education (research)

• Hands-on experience • Real-world activities • Professional interaction Baylor University Students

Pumping Well Drawdown • Temperature effects • Fairly straight line • Pumping variations • Follows the model ?

Pumping Well Drawdown 1 • Aquifer Transmissivity 2 • 1 – 200,000 gpd/ft • 2 – 125,000 gpd/ft • < 5,000 ft? • Acres Well – 75,000 gpd/ft • > 35,000 ft.

Speci cific C Conductance ce 2500 u S/cm 2000 Spc was measured using a YSI Pro 30 meter and 1500 A hobo conductivity data logger 1000 The YSI is considered the accurate measurement and the data logger is experiencing drift. 500 Temperature measurements did not show drift on the datalogger like the Spc. 0 4/30/2018 5/2/2018 5/4/2018 5/6/2018 5/8/2018 5/10/2018 5/12/2018 5/14/2018 5/16/2018 5/18/2018 5/20/2018 5/22/2018 5/24/2018 5/26/2018 5/28/2018 5/30/2018 6/1/2018 6/3/2018 6/5/2018 6/7/2018 6/9/2018 6/11/2018 6/13/2018 6/15/2018 6/17/2018 6/19/2018 Therefore, water quality did not appear to change over the pumping period. Hobo Datalogger YSI Meter Linear (Hobo Datalogger) Linear (YSI Meter)

5/31/2018 5/01/2018 4/30/2018 Date Water Chemistry during the Test mg/l TDS 942 945 922 Sulfate mg/l 231 220 222 Nitrate mg/l 0.009 0.007 0.007 1000 100 200 300 400 500 600 700 800 900 0 4/30/2018 5/1/2018 5/2/2018 5/3/2018 5/4/2018 5/5/2018 5/6/2018 TDS 5/7/2018 5/8/2018 5/9/2018 5/10/2018 5/11/2018 5/12/2018 5/13/2018 5/14/2018 Sulfate 5/15/2018 5/16/2018 5/17/2018 5/18/2018 5/19/2018 5/20/2018 5/21/2018 5/22/2018 5/23/2018 Nitrate 5/24/2018 5/25/2018 5/26/2018 5/27/2018 5/28/2018 5/29/2018 5/30/2018 5/31/2018

Isotopes 2 H and 16 O

TRINITY OASIS WATER APPARENT AGE 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 LLC AQUIFER TEST INSIGHTS 1. WE KNOW MORE ABOUT THE LOWER TRINITY AQUIFER IN BELL COUNTY THAN EVER BEFORE 2. BOUNDARIES OCCUR BUT THEY APPEAR SEMI-PERMEABLE AND LOCATIONS ARE NOT EXACT 3. THE PUMPING WELL IS IN A MORE PRODUCTIVE AREA THAN MOST OF THE AQUIFER 4. THE WATER CHEMISTRY REMAINED CONSISTENT THROUGHOUT THE TEST 5. THE WATER IS QUITE OLD AND NOT BEING RECHARGED FROM CURRENT RAINFALL 6. COOPERATIVE EFFORTS BY THE GROUNDWATER “COMMUNITY” IN BELL COUNTY MADE THIS A SUCCESS