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f' ~/1 rV (.,..;l cj) (P .~. . l,~t~~ ~ C1!~~\ \l~ '].. \~S~ 'il OC,\ ,,' ,<\' I', D ,. .' ,t-P ,. ) 0\.0, 1\G"'- c: ~.t~~ ,'>. (.Ol"'~ September 1952 GEOLOGICAL SURVEY WATER RESOURCES INVESTIGATIONS Ground ~ater.--Field studies on all scheduled projects and office revie~ and preparation of reports for publication ~ere continued. Other progress rr~de during this month was as follows: MONTANA In the Gallatin Valley routine measurements of the water level in wells, stream flow, and temperature were cOlltinued, 8 aquifer per- formance tests ~ere made, 10 water samples were collected for chemical analysis, the altitude of 34 wells was determined by instruncental levelling, and the geology of 40 sq mi "as mapped by reconnaissance H.e thod s . On the Cro" Indian Agency pro~ect routine water-level measure- ments "ere made, 29 ohservation "ells were installed, 2 aquifer perform" ance tests "ere n~de, 29 ~ater samples ~ere collected for chemical snalysis, the altitude of 12 wells "as determined by instrumental levelling, and the geologic mapping of the area by reconnaissance methods was completed, Routine water-level measurements were made in the Cro" Creek- Townsend Vallex. the Helena Valley, and the Buffalo Rapids projest. .1. NORTH DAKOTA Supervision of test drilling on the Fort Berthold Indian Reservation was resumed late in the month. SOUTH DAKOTA In the Oahe area, one of the long-term aquifer performance tests "as completed and about 20 "slug" aquifer performance tests were made; approximately 600 "ater samples "ere collected for electrical conductivity determinations; and routine water-level measurements were made. Five water-level recording gages were operated in the ~ Randall area. WYOMING About 420 "ells were inventoried in the Laramie River and North Platte River drainap,e basins and 40 "ells were inventoried in the CrOW--- Creek-Lone Tree Creek area. Routine water-level measurements were~e in the North Platte irrigation pro.1ect. the Glendo area, the Horse Creek- Bear Creek area, the La Prele area, the Laramie Basin, the pass Creek Flats area, and the Riverton 1rr1~ation pro~ect.