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Hydraulic testing of hole UA-1-HTH-1, Amchitka Island, Alaska

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Abstract

Total depth of the hole was 1,054 meters (3,458 feet) but, because of borehole erosion and bridging, only about 198 meters (650 feet) of the hole was·hydraulically tested with straddle packers. Some information was obtained on the lower part of the hole by use of the pressure recorders which are used with the straddle packers. The heads below land surface in that part of the hole tested with. straddle packers. ranged from·3.9 meters {12.7 feet) in the .. interval 80.5 to 125. 0. meters (264- to 410 feet), the uppermost zone tested with straddle packers, to 5.1 meters (18.6 feet) in the interval 227.4 to 278.6 meters (.746 to 914 feet), the lowermost part of the hole tested with straddle packers. The composite static water level obtained following a pumping test.was 5.5 meters (18,0 feet). The composite head below 278.6 meters (914 feet), determined from a pressure recorder, was about 12.2 meters (40 feet). The head distribution. indicates a decreasing· head with depth. Water samples were collected from two intervals for chemical, radiochemical, and C-14 analysis. The unadjusted age of water in the interval 183.5 to 234.7 meters (602 to 770. feet) was determined to be 8,410 years, and for the interval 227.4 to 278.6 meters (746 to 914 feet) was 17,880 years. After adjustment the.ages of the waters may be less; however, they would still be. in the thousands of years and the relative difference probably would still be real.

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Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Unnumbered Series
Title:
Hydraulic testing of hole UA-1-HTH-1, Amchitka Island, Alaska
Year Published:
1972
Language:
English
Publisher:
U.S. Geological Survey
Publisher location:
Denver, CO
Description:
27 p.
Country:
United States
State:
Alaska
Other Geospatial:
Amchitka