ML20006F615
| ML20006F615 | |
| Person / Time | |
|---|---|
| Issue date: | 02/05/1990 |
| From: | Grimm J, Randy Hall NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| REF-WM-67 NUDOCS 9002280226 | |
| Download: ML20006F615 (3) | |
Text
.
i goso UNITED STATES j
4 NUCLEAR REGUtATORY COMMISSION l
p S
E j
REGION IV URANIUM REC V FIELD OFFICE DENVER, COLORADO sGIN i
FEB 51990 l
URFO:JPG MEMORANDUM FOR:
WM-67 Docket File i
i FROM:
Joel Grimm, Project Manager
SUBJECT:
MEETING NOTICE AND SITE VISIT TRIP REPORT January 24, 1990 i
Michael Abrams, DOE, and Kent Bostick, TAC, conducted a briefing on the geology l-and hydrostratigraphy underlying the Ambrosia Lake tailings site. The briefing also included a description DOE's rationale for applying supplemental standards L
to this site.
For the most part, the briefing was an eloboration on the l
Remedial Action Plan.
The uppermost aquifer at the site occurs in the alluvium and weathered Mancos l
Shale.
This aquifer is hydraulically connected to a sandstone member known as i
the Tres Hermanos unit C.
The water table was induced by infiltration from arroyos where mine water was discharged, from mill make-up water storage ponds, I
and f rom the tailings impoundment.
DOE proposes to apply for Supplemental Standards for this aquifer because: (1) the alluvial and Tres Hermanos C aquifers yield insignificant ground-water, (2) the aquifers no longer are recharged, and (3) the remedial action design for the tailings pile will limit future infiltration of water through the tailings, and will provide long-term stability for the pile.
DOE recommends narrative standards only for the site, without numeric limits, point of compliance, ground-water restoration, nor l
monitoring.
e January 25, 1990 On my visit to the Ambrosia Lake site, I was accompanied by John Briggs, MKE construction engineer.
The visit was combined with a weekly site inspection by Larry Patrick, Chem-Nuclear health physics manager.
The tailings pile shows evidence of considerable erosion and does not have an interim cover.
MKE has mobilized at the site, constructing site drainage controls, a runoff evaporation pond, and access control.
All of the standing water was removed from atop the tailings pile and disposed of in the lined evaporation pond.
The mill facilities are completely demolished.
Debris has been segregated into numerous piles for future disposal in the tailings pile or 9002280226 900205 PDR WASTE PDC b
WM-67 h
2 FEB 51990 a proposed separate trench.
Asbestos debris has already been disposed of in the tailings pile.
My visit concluded with a trip to a proposed borrow source for erosion protection materials.
The site is a rock quarry developed by the U.S. forest Service for road bed materials.
The quarry is developed in the upper portions of a basalt mesa associated with the Mt. Taylor volcanic field.
The uppermost basalts are vesicular and deeply weathered.
00E proposes to enlarge the quarry, using only deeper rocks which a more dense and unweathered.
Unsuitable materials will be segregated and stockpiled for the Forest Service.
I swit Joel P. Grimm Project Manager Approved byr At PJam5n E. HhT1 Director l
l l
l P
y o
l j.
AMB TRIP REPORT /1/24/90 DISTRIBUTION Docket File WM-67
- PDR/DCS )
'URF0 r/f ABBeach, RIV LLO Branch LLWM JGrimm 1
RGonzales DJabocy
'k i
CONCURRENCE:
DATE:
JGrim/URF0/db f)
Mi/95 EHawkinn/URF0 2M9o D,
RHall/URF0
- 9. e y
)
1...