Laserfiche WebLink
South Platte Decision Support System Groundwater Component Task 33 Field Study Work Plan <br />for Alluvial and Bedrock Well Installation, Testing, and Water Level Monitoring <br />other than the pumping well within 2,000 feet will be checked to verify that they are <br />not pumping. The pumping rate at the pumping well will be determined by a State of <br />Colorado certified well tester. Pumping will be conducted at a sustainable constant <br />rate for a period of up to 72 hours, or until the water level has stabilized sufficiently to <br />indicate equilibrium. Water from testing will be discharged to overland flow or <br />nearby surface water bodies without treatment or chemical testing. If it is feasible, <br />water will be piped to a location far enough away from the pumping and any <br />observation wells that percolating water returning to the aquifer will not interfere <br />with the test. Water level data will be recorded during the pumping and recovery <br />phases using a pressure transducer and data logger installed in the piezometer. <br />Aquifer performance testing results will be reduced and interpreted using <br />appropriate standard graphical analysis techniques such as the Theis (1935), Cooper- <br />Jacob (1946), and/or the Neuman (1974) methods of analysis. All interpretations will <br />include appropriate corrections to adjust for regional groundwater elevation trends <br />and aquifer boundary effects. <br />It is anticipated that at some locations, wells used to provide water to the South Platte <br />River for augmentation of flows may be used as the pumping wells at multi-well <br />aquifer tests. At such locations, the augmentation wells may be pumped for periods of <br />weeks to months, after which analysis of observation well drawdown data is expected <br />to yield high quality specific yield data. At these locations, flow meter certification <br />will be performed, if necessary, according to State of Colorado regulations and up to <br />72 hours of continuous discharge flow logging will be performed. However, due to <br />the extended pumping duration, periodic totalizing flow measurements will be <br />obtained from the entity operating the well rather than continuously logging <br />discharge flow data for the entire pumping event. <br />It is also anticipated that aquifer tests may be performed at wells that are not paired <br />with an observation well. At locations where single-well aquifer tests are performed, <br />water levels in the pumping well and discharge will be logged continuously for a <br />period of between 8 and 72 hours. Flow meter or power consumption coefficient <br />(PCC) certification will be performed, if necessary, according to State of Colorado <br />regulations. The specification for flow measurement and flow meter/PCC <br />certification is provided in Appendix J. <br />According to Dick Wolfe, Chief of Water Supply, augmentation will not be required <br />under the following conditions: (a) Discharge of the produced water to nearby fallow <br />fields or into a ditch where the water could infiltrate back to the aquifer, as long as the <br />discharge is applied to the ground near the test site, in as efficient and practical a <br />manner as is feasible, and with as minimal consumption as is feasible; (b) Discharge to <br />a flowing stream or ditch that allows water to be immediately conveyed back to the <br />South Platte River will not require augmentation. Augmentation of produced water <br />will be required, however, if the produced water is allowed to flow into a reservoir or <br />other surface storage facility for later beneficial use (Wolfe 2003). <br />~. ~.1 l <br />13 <br />Z:\SPDSS\10-CDM DELIVERABLES\PHASE 2 FIELD WORKPLAN\FINAL DRAFT\FINAL SPDSS TASK 33 2 WORK PLAN.DOC <br />