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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 />Water level data will be recorded in the observation well during the pre-pumping, <br />pumping, and recovery phases using a pressure transducer and data logger. Aquifer <br />testing results will be reduced and interpreted using standard graphical analysis <br />techniques such as the Theis (1935), Cooper-Jacob (1946), and/or the Neuman (1974) <br />methods of analysis. <br />Appropriate adjustments for regional water level changes will be performed. An in- <br />well pressure transducer and data logger will be installed in the observation well and <br />operated for at least 6 months and up to a 12-month period to characterize seasonal <br />effects on water levels. <br />After the in-well pressure transducer and data logger have been installed in the well <br />to be monitored for the long-term, data will be recorded at an as described in <br />Section 3.1.2 These data will be used to analyze water levels as part of Task 44. <br />3.2.6 Disposal of Drill Cuttings and Fluids, and Restoration of Site <br />Drilling mud and cuttings will be disposed of onsite if acceptable to the owner, or <br />offsite if otherwise. After completion of well installation, the Contractor will contact <br />the landowner's representative to determine that site restoration is comparable to pre- <br />existing site conditions and will resolve any reasonable issues. The site will be <br />regraded and a dryland seed mix spread if necessary. Site reclamation for the bedrock <br />well is further discussed in Appendix F. <br />3.3 Task 37, Aquifer Pumping Tests <br />As stated in the Phase 2 SOW (CDM 2003b), up to 10 bedrock aquifer pumping tests <br />using existing wells will be performed under Task 37 to fill aquifer property data gaps <br />within the Denver Basin bedrock aquifers. However, if more than 10 suitable sites are <br />identified in Task 37 where existing wells can be used to collect aquifer property data, <br />then CDM will meet with the State to discuss the use of the existing wells from which <br />to collect aquifer property data instead of drilling a new bedrock well under Task 36. <br />The aquifer testing and water level data collection will help address the SB 96-74 <br />recommendations regarding aquifer pumping tests and aquifer properties of the <br />Denver Basin Region bedrock aquifers. <br />3.3.1 Bedrock Well Aquifer Testing <br />Aquifer pumping tests will be designed and implemented after performing a detailed <br />analysis of the existing but unpublished well testing data contained in SEO well <br />permits, to be performed as described in the Phase 2 SOW (CDM 2003b). The aquifer <br />tests will be performed by using existing high-capacity wells and/or wells being <br />constructed by others in the Denver Basin bedrock aquifers. Municipalities will <br />primarily be targeted for this data collection effort. <br />It is anticipated that in most locations single-well pumping and recovery tests will be <br />conducted. However, in locations where other wells, such as nearby production or <br />monitoring wells, or wells proposed for abandonment, can feasibly be used as <br />~.~.-~ <br />18 <br />Z:\SPDSS\10-CDM DELIVERABLES\PHASE 2 FIELD WORKPLAN\FINAL DRAFT\FINAL SPDSS TASK 33 2 WORK PLAN.DOC <br />