U.S. ARMY ENGINEER DIVISION, PACIFIC OCEAN
CORPS
OF
ENGINEERS
provect TITLE CRATER (puta MEUT- ENEweIasi no. | oF | sus
LOCATION
KUNIT
DRAWING (S) NO,
COMPUTED BY__
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SECTION
pate S241 cHecKen ay
DATE
DESIGN ANALYSIS
1.
References.
a.
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USGS report, "Ground-water Conditions on Enewetok Atoll, with
Comments on the Effects of Use of Conventional Explosives," by
F. C. Koopman, May 1973 (Incl 1).
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b.
Hawaii Institute of Geophysics Report, “Groundwater Resources
Evaluation:
Enewetak Atoll, " by R. W. Buddemeier and R. C. Jansen, October
1976 (incl 2).
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Ree a states (pg 16) “The‘island of'Runit does
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not have a shape favor-
able to the formation of a fresh-water or:slightly saline-water lens.
is a long narrow island and the distance from its axis to the ocean is
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generally less than 300 feet, which does not make it qa prospect for fresh-
water accumulation under prevailing precipitation and other hydrologic
conditions."
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3. Ref b states |e 50-51) uw] . .the available water will normally be at
least 25% seawater and may rise above 50% during dry seasons." Again under
"C,
Conclusions and Recommendations 1. '. . . Actual salinities may range
from a low of 20% seawater toa high valued well in excess of 50% seawater.'
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4.
It should be pointed out that 25 percent seawater means a chloride
content of about 9,000 mg/l. This is far in excess of anyone's definition
of freshwater.
Note table I Quality Standards of same report shows permis-
sible chloride content of 250 mg/l,
Hence, 25 percent, seawater ts, 36 times
saltidr than the "permissible"' 'standard." *”
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5. Note that there is'not significant inconsistency between the actual
‘” ‘
test data in two reports. However, statements and estimates on page 50 of
ref b may be easily misinterpreted if taken out of context of the whole
report, since in three places it refers to "total freshwater inventory" or
“total freshwater equivalents." This inventory and these equivalents are
actually highly saline brackish water.
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potentialfuser “must'be cautionedthat diotieae! Tdundeted “ikper—
Ont geawater will be salty,when dried, and will be uncomfortable pe.worn:
for. extended periods.
POD Form 115
1 Jui 70
SC
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