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UC DAVIS: Facilities: Operations & Maintenance December 17, 2004 DEANS, DIRECTORS, DEPARTMENT CHAIRS, AND CAMPUS ADMINISTRATIVE OFFICERS RE: PUMP TESTS The University will be cooperating again this year with the City of Davis to perform some pumping tests in December and January that may result some temporary changes in the characteristics of our domestic water supply. We do not anticipate that the changes will significantly impact research projects or other campus operations, but we are taking the precaution to inform the campus in advance. The tests are planned to start on December 24 and continue for a period of 4 to 8 weeks. Campus drinking water is groundwater pumped from the "deep" aquifer (roughly 1,400 feet below the ground surface). Historically, most of the City's drinking water has been pumped from the "intermediate" aquifer (roughly 400 feet below the ground surface). However, in recent years, the City has installed several wells in the deep aquifer, and the City has plans to install many more deep wells to meet their future water demands. Relatively little is known about the characteristics and extent of the deep aquifer. The City-Campus partnership on this study, which is our third such collaboration, will help both agencies understand the potential effects of increased pumping from the deep aquifer and will support us in developing long-term planning priorities. This information is critical to our long-term ability to provide high quality drinking water to the campus. During the period when tests are being performed, the campus will maintain a steady rate of pumping from our deep aquifer wells. Water from a campus well in the intermediate aquifer will be turned on as need to meet peak demands. For these tests, a new well from the City will be pumped extensively while groundwater elevations in the region are closely tracked. O&M Utilities has planned implementation of the tests to minimize impacts on campus activities. Most campus users will probably not notice any changes in the campus water supply while tests are being performed. However, since peak demands will be met using an intermediate well, the characteristics of our water will vary slightly for several parameters while the tests are in progress. For example, the water will be slightly harder than our normal water supply. The water will continue to meet all state and federal drinking water standards. The attached table describes the water quality characteristics of the existing campus drinking water supply and the expected range of values likely to occur during the test period. If you have any questions or concerns about the planned tests, please contact David Phillips, Associate Director for Utilities, at 754-8214. Sincerely, Kathleen Moore Associate Vice Chancellor, Facilities: Operations & Maintenance 04-132
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