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<br />002288
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<br />Short-range Program
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<br />Reccmna1ssance studies. -- Although reconnaissance geolog:!.c maps
<br />are available for all Arizona at the 1:375,000 scale, much of the
<br />iutol'lll&t1on 18 out-dated and incomplete. Proposed for :Immediate
<br />remappins at scale 1:250,000 are the WilliElllls, Prescott, Phoenix, and
<br />A,10 2-degree sheets (see fig. 4).
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<br />In California, the Division of Mines is preparing geologic maps
<br />at the 1:250,000 scale. In the part of the State here of concern,
<br />mappins is yet pending on the Needles, San Bernardino, Los Angeles,
<br />Salton sea, Santa Ana, and Long Beach 2';degree sheets. It is proposed
<br />that the Geolog:!.cal Survey' accelerate these particular maps by stuc\r1ng
<br />the areas not well known. Cost of these reconnaissance studies is
<br />est1mated at $190,000 yearly over the five-year period. !lhey' would
<br />anticipate unusual difficul~ies that might be encountered in constructins ,,,
<br />water-management works, and provide a necessary background for general
<br />planning of more detailed studie's. Further, geologic reconnaissance
<br />constitutes the first appraisal of the crustot the earth and the
<br />characteristics and resources that will affect man's activities thereon.
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<br />General-purpose mapping.-- Geologic mapping and related studies,
<br />at scales of 1:02,500 and 1:24,000, would provide immediate background
<br />intol'lll&tion for Site planning.ot proposed water-development and
<br />eng:!.neering projects and tor areas of urban development. !lhe following
<br />are proposed:
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<br />1. !lhirv l5-minute quadrangles that include the general aline-
<br />ment of the Central Arizona Aqueduct. Among these, four quadrangles
<br />at and near Phoenix, also four at and near Tucson would serve
<br />multipurpose planning related both to the aqueduct and to urban
<br />expansion, water storage, and waste disposal.
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<br />2. !lhtrty-one l5-minute quadrangles that include the sites of
<br />proposed da.ms, reservoirs, and tunnels of the Marble Ca:\Yon-
<br />Ka.rlab, Coconino, Bridge Canyon, AlEllllO, sentinel, Buttes, and
<br />McDowell projects and the Salt River above Roosevelt Reservoir,
<br />all in Arizona; the Dil<ie project in Utah, and the Las Vegas
<br />project in Nevada. Priority Ellllong these 31 quadrangles would
<br />be arranged with the Bureau of Reclamation. No background
<br />geologic studies of these are available.
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<br />3. IIi urban areas, four 15-minute quadrangles near Phoenix and
<br />four near Tucson, as noted a.l.reatW; also, near Los Angeles, three
<br />7!-minute q,uadranglesin addition to those currently in progress.
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<br />Est1mated cost of this general-purpose mapping would increase fran
<br />$335,000 in the first year to $1,105,000 in the third, fourth, and fifth
<br />years.
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