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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 />Regarding water level data collection, an in-well pressure transducer and data logger <br />will be installed in each of the 27 wells and operated fora 6- to 10-month period. <br />During any aquifer testing, water levels will be recorded on a time interval <br />appropriate for the test. At times other than during an aquifer pumping test, the water <br />level data will be recorded at an hourly interval, averaged to daily values, and <br />normalized to elevation for reporting. After initial installation and confirmation of <br />operation following a 2-week start-up period, data will be retrieved on a quarterly to <br />semi-annual basis. Water levels at supplemental wells will be measured during spring <br />and fall water level measurement events. <br />3.1.6 Disposal of Drill Cuttings and Restoration of Sites <br />Drill cuttings will be disposed of by spreading on the site and leveling, if compatible <br />with the land-use and acceptable to the owner. If required, the cuttings will be <br />disposed of as fill at an appropriate location. If necessary, disturbed areas will be re- <br />seeded with a dryland mix. After completion of well installation, CDM 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. Site reclamation is <br />further discussed for each drilling method in Appendices C1 and D. <br />3.2 Task 36, Construction and Testing of Bedrock Well <br />As stated in the Phase 2 SOW (CDM 2003b), one bedrock well will be constructed <br />under this task and up to 10 bedrock aquifer pumping tests using existing wells will <br />be performed under Task 37. However, if more than 10 suitable sites are identified in <br />Task 37 where existing wells can be used to collect aquifer property data, then the <br />Consultant 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 well. If the proposed new <br />bedrock well is not drilled, then up to 10 additional aquifer pumping tests will be <br />performed under Task 37. <br />During data analysis tasks, general candidate locations were identified to fill existing <br />data gaps in the Denver Basin Region. The purpose of a new well will be to act as an <br />observation well for an aquifer pumping test at a nearby municipal well. The location, <br />total bedrock boring, and well construction depth under this task will be dependent <br />on cooperation of owners of the high-capacity wells, on the existence of data gaps, <br />and on the well construction characteristics of candidate high-capacity wells. <br />3.2.1 Bedrock Aquifer Drilling and Well Installation Program <br />The Phase 2 Field Program will include the siting, installation, testing, and monitoring <br />of one well up to 740 feet deep, the maximum depth recommended fora 5-inch <br />Schedule 80 PVC well (INRCS 2002). It is anticipated that the bedrock well will be <br />completed with 5-inch schedule 80 PVC casing with up to 200 feet of 0.040-inch slot <br />factory-milled screen. However, if a shallower depth is required or alternate <br />construction materials and methods are approved by CDM and the State, the well <br />may be constructed of other materials capable of meeting the SPDSS objectives. If no <br />~.~.-~ <br />14 <br />Z:\SPDSS\10-CDM DELIVERABLES\PHASE 2 FIELD WORKPLAN\FINAL DRAFT\FINAL SPDSS TASK 33 2 WORK PLAN.DOC <br />