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HydroBase, when the current Technical Memoranda are finalized after the Peer <br />Review Committee's review of the Draft Final Tech Memos. <br />10. Question from Bob Longenbaugh about defining aquifer boundaries and <br />whether there are any conflicts between the SB5 regulations and the original <br />Robson work. Will there be changes in the SB5 rules as a result of revised <br />aquifer boundaries? Ray Alvarado recognized the potential problem associated <br />with any revision to the bedrock aquifer boundaries, but indicated that revising <br />the SB5 rules is not part of the SPDSS; that reopening the SB5 rules would be a <br />separate issue. Ray noted that the SPDSS is committed to producing the best <br />possible information and data. Ken Knox reiterated Ray's point on producing <br />the best science in the SPDSS and that any change of the SB5 rules will be made <br />as a separate decision. Ray Alvarado indicated that the Colorado Water <br />Conservation Board's (CWCB) objective is to produce data that can be used to <br />further support its mission. <br />11. Alluvial aquifers <br />a. Contours from Hurr and Schneider rather than the data behind the <br />contours were used because the original data sets were not available. <br />b. Bob Longenbaugh asked how the gravel mining and other modifications <br />to the alluvium would be handled in the modeling (i.e., how will the <br />changes over time be taken into account in the modeling). Gordon <br />McCurry indicated that this would be considered in the modeling. <br />B. Aquifer Property Data <br />1. Mark Palumbo asked if K data are available. Gordon McCurry replied that it can <br />be derived from the pumping test data at sites with the shallow alluvial wells. <br />2. Question on how K was computed from T. Gordon McCurry indicated that the <br />K of the sand was used; if a portion of the aquifer thickness was composed of <br />clay, the thickness for the sand portion was used to calculate K from T. <br />3. Regarding calculating K and T from specific capacity tests, Jim Jehn noted that <br />sometimes drillers apparently report the pumping water level to be where the <br />pump was set, not where the actual pumping water level was at the time of the <br />test. <br />C. Aquifer Water Level Data <br />1. Objective is to get static water level measurements without noise from well <br />pumping. In early spring (Feb., March, and April), water level measurements <br />were used in alluvium and in bedrock mapping to evaluate long-term trends. <br />2. Willem Schreuder asked if fault lines were used in kriging to separate individual <br />alluvial regions when contouring. Mark McCluskey indicated no, but kriging <br />parameters were used that gave the same effect when necessary. <br />3. What is being done to fill in data gaps for water levels map for 1990? Possibly <br />look at static water levels provided in completion reports for wells that have been <br />drilled since 1990, including data for 1991, 1992, etc. <br />10 <br />