EIS-0113_Section_11 - Hanford Site

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Appendix V' Section V.6 Aewrae Vetis. pose 0.29. urwragh 2
R.ECcr ED DOE-RL
T 71996
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3.5.3..4
3.5.3.4
The OEIS stabs that nth@ zone of (radiologlc) contam/natlon around the 216-6-5
revere. [inject Ion) wall appears to b, [chemiutly) stable, With no apparent
further migration of radionuclides. m- Be aa,te are sheen for Cs-177, Sr rM, and
Pas-239,240. NoWewer, a Previous DOE InvestigationIndicated that there was
sew evidence of contaminant migntien bsneaM the .11 site, the source of
wnf ch was uncertain. the fol ibwinp vas reported by Smith (1990):
DIM logging showed that sediments distributed over a broad area antl
located just above the basalt surface wan contaminated with lorLvo
game contamination. Examination of previously collected gamma legs
Indicated that a possible source of this contamination could be the V
cribs located [approximately] 900 • north of the mer ge well. This work
sli p Indicates that the co.tamiNtien may be moving In . EOUth.m terly
direction..:
Smith (1980) &1.. rwmwended that the broad contamination plume at the basal!
Surface should be investigated as to its distribution, source .1 source¢ ,
ionUClldo identity and concentrations, and at a monitoring pi an be
TM
aloud if required. This study showed that the position of the Water table
and the type of sediment to which wa s te solutions m discharged are Important
factors fo r e pntrolllhd radionuclide distribution,. TM study also recommended
thews, of stainless suet .11 screens for monitoring wells. Anomalous beta
activity wasbnsent on rusted'pdrtimn. Of Forrodad.11 messy, and ws
bel laved to have .produced sow erroneous radionuclide analyses.'
This is the only reverse wall for which contaminant migration has been
characterized, and ... could not thereby conclude that the results are
statistically significant. Because of aquifer: heterogeneities and the chemical
v. 10111ty of fluids originally. Injected iny. various. reverse Wells:. it coy
not he reasonable to extrapolate these results to other reverse well locations.
It is noted that zooms ref tontamln.tion appear to extend beyond the ..I..
depth. Of penetration of the monitoring Wells. It Would be useful a know b
Nut depth contaminants coy have penetrated basalt$: at the base of the
Unconfined aquifer. .Previous r,assre per, at i4nforil have presented Come
er fdence for dee per contaminattonl Brauer end Aleck (1973) noted the Dresence
of I-129 in groundwater outlined freer n11 59 -10-E12 P. The sampled aquifer
was believed to be conflnec, and It was suggested that there had been some
contamination of the groundwater since the early'. 1940's.
GEOLOGY 14
!,iLIVISION
Section 3.7.Y.6 1n-Place Stabilization and 01s o e lied to Previous!
Di.pos -o ntm. rated an,, Sites. cape 324 . ạl
VA replan. 1
This section states that a geophysical survey Of the liquid waste sites with
high subsidence potential will be completed to characterize them add As
identify gut-ifti.ctlbn ro paints. Further discussion of the fusibility and
adequacy of subsidence control should to provided in the Final EIS.
.Section 4.0. Affected Environment, page 4.2. Flown 4.1
Figure 4.1 provides the general locations of the defense high-level and
trams ... Pit wastes. Figure 4.1 lrtdicates Mat waste disposal occurred It the
200-X; 200-E add SOB Areas ad 10 the Vye. enri.l. Ground. The DEIS should ran
precisely Identify all Waste locations at Hanford. It is further recommended
that the Final EIS Include additional infosnsti on . ngarding-ehe geahvdrology,
gwchwistry,
Sp
and geology (e.g., 9evmerphology, strati graph,, snot atrurure) of
ecific waste disposal areas to better dnaract,111. these sites. Farvaagla,
the potential for contaminant migration in the '.repose zone beneath a given
disposal site Cannot be reliably determined vitmout an ova lustiwi. of actual,
`ote-spetific soil moisture characteristic, antl curves of pm.. r. head rar...
hydraulic conductivity.
Section 4.3, Seismicity. pace 4.10; paragraph 4
The existence of faulting and the possibility of fault reactivation 1n the
waste disposal areas na g not been adequately. s persed.. es The general guideline
in 10 CFR 61.50(.)(9) may as of use in discussing the potential tad
significant. of faulting ire these mss.
The referenced draft EA for Redford(OCE,, Iwx) presented •-.generally favorable
view of us tectonic setting and possible effects of .tectonics on waste
i zoian on. In the NAC's major cewent 04 on the draft EA (WK, 1985.), this
view cos cansitle-ed to be tn.depuately supported by the data end analyses
...sanded. The stateoents wade by the NAC staff al.ruld, the reference
.repository also apply to the waste disposal alternatives of this LEIS.
3.1.3.12
3.1.1.3
3.2.2.2
3.5.3.4
The Presence of varying concentrations of contaminants treat were released to
the unconfined a q uifer system over the last four decades provides a-unique
op pprtuntty to betteruad ... tend in sit. W.I. ban.I.r. and ...chemical
a tardation processes. Given this unique opobrtunity, the DOE should plan
adds ti pnal in situ characterization studies of this type as a means of better
supporting modeling studies of contaminant transport In the unconfined aquifer
system.
Section 4.3. Seismicity, page 4AD, paragraph 4
A series ofub-vertical clastic dikes has Dean observed (AX. 1985b) in she
trench .,I's It the U.S. Ecology low-Level Waste Olsposd Area, which 1s
Imscod in elate oroxi.fty to the 200-E Ana. Tim dikes cut ,areas, but do not
appear to offset the sand and silt stray in the trenches. They taper upward
ant extend frog below she case of Mthe tremor. to wia 0l 8 to 10 feet of the
surface. TM1 1 are approximately 2 to 3 feet vide at the base and several
inches wide where they are truncated or pinch out near the ground surface. The
dikes, which occur in miner areas of the Hanford Aeservatiam, may be related U
fissuring caused by ground notion resulting from seismic activity. The
3.2.2.7