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864 (; 3 j -HUEDI DAM AND RESERVOIR, COLO. It ShOlll,1 JJe note,1 that over half dIe personnel for phast' II pre,- ent.ly reside ill the ,lrea. The reb..t.lyely srllnlllle'\" populat,ion is ex- pect'ed to lin~ in e-xisting c~mmunities; therefore~ i~ is l1nli.k~ly thnt additional water Sllpplies wIll need to be d~'Veloped for Jllltnlclpal use during this phase. IndusLrial usage for phase II also i:3 small, but. whp.ther or not n. firm year-round supply is a"ailable depends on who builds the plant(s) :lnd t.heir 10cotiol1. It is possIble that. water nsage by the prototype plant,(s) coul,l he larger than estimated if the oil is more highly refined at. the site. of prot1nction th:1I1 assumed. As much as l/i&O acre-feet per yea.r would be required for a. production rate of 25,000 barrels per day if a hydrogenated eoke distillate were the product. It would seem prudent to assume t.his large-I' water usage. For planning "ater supplies, it. is suggested that, a faet.or of 2.0 be used to 1nsure an ample margin for I:lrger production quantities than assumed. On this basis the water supply eap"bility for phase II shonld be 5,000 acre-feet per year. lVate,'nquirem,ent fo;. pho.,e III The production of lfiO,OOO barrels per day of parti"lIy refined shale oil is estimated to require 27,000 acre-feet of water pel' year for munic- ipal and indust.rial use, of which 11,000 aere-feet would be retllrned to the stream. Tables 3 and 4 give snpporting data. These figures are inclusive of any water tJiverted for use during phase II. Since a basic assumption is th"t all the shale oil will be refined in t.he area, the estimate of water use probably is maximum for this oil production quantity. For planning water supplies, it is suggested thn.t rr factor of 1.r, be llsed to cover errors in estirnn.tion fi.nd larger production quantities t\Ulll assumed. Applying a factor of 1.5, the "ater sapply eapability for phase III should be 40,000 acre-feet per year. lV ateI' requirements for phase IV From tables 3 and 4 it m"y be seen that estimated "ater use for the production of 1,250,000 barrels of refined shale oil per day is 252,000 acre-feet., of which 93.000 acre-feet would be returned. These figures are for industrial and municipal use for both shale oil produetion and shale-related industry. Usage is inclusive of that estImated for pre- vious phases of de.elopment. All shale oil is assumed to be refined in the urea., t.}ms water use should be maximum for the oil qua.ntity assumed. For planning "ater supplies. We suggest taking the water usage est.imated without application of a factor to account for errors. The period in question is sufficiently Inr in advance. to allow re-appra.isa.l "hen the actual pattern of development becomes evident. Our cur- rent recommendation for;; water sllpply capability for oil shale devel- opment for the perIOd 19,0 to 1975 is 250,000 aere-feet per year.