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<br />Denver Research Institute in 1954 - 145,000 acre-feet <br /> <br />Department of the Interior in 1973 - 155,000 acre-feet <br /> <br />Colony Development Operation in 1974 <br />175,000 acre-feet <br />ClUe \3 Loa -7 SO <br />As you can see, the estimates <br /> <br />(extrapolation) - <br /> <br />000 c~-P <br />have been gradually <br /> <br />creeping <br /> <br />upwards, and we strongly suspect that the true figure will be even <br /> <br />higher. The first two estimates did not take into account the water <br /> <br />requirements for processed shale disposal, revegetation, and the <br /> <br />production of electrical energy. Neither did the earlier estimates <br /> <br />take into account the necessity to prevent high concentrations of <br /> <br />dissolved solids, principally calcium carbonate, from being dis- <br /> <br />charged into the Colorado River. <br /> <br />Based upon increased attention to environmental and salinity <br /> <br />factors, the staff of the state water board believes that all esti- <br /> <br />mates heretofore made are too low. We believe that the consumptive <br /> <br />use of somewhere between 200,000 and 250,000 acre-feet of water per <br /> <br />year will be required to support a million barrel a day shale oil <br /> <br />industry. Until a lesser requirement is actually demonstrated, the <br /> <br />state planning is proceeding on this basis. <br /> <br />The most comprehensive study of all aspects of the oil <br /> <br />shale industry has been carried on by the Colony Development Operation. <br /> <br />This group, consisting of Atlantic Richfield, The Oil Shale Corpcration <br /> <br />and others, has conducted extensive field experiments relating to <br /> <br />-3- <br />