APPENDIX A: DREDGING SURVEY INFORMATION PACKAGE
The following are excerpts from the ERF information package that was assembled
and distributed to several dredge manufacturers visited in January and February
of 1994. The objective of this information was to give the manufacturers sufficient
information to determine the feasibility of dredging in the Flats.
Information Package for Dredge Manufacturers
LOCATION: Eagle River Flats, Fort Richardson, Alaska.
AREA TO BE DREDGED: Ponds in Area C. Area C is approximately 45 acres total,
consisting of a large 25-acre pond connected to several smaller ponds.
WATER DEPTH: Varies between < 1" to 15".
TIDES: Pond areas will flood only during extreme high tides occurring in combi-
nation with high river discharge.
DREDGING DEPTH: 24" to 30" maximum.
MAXIMUM DISTANCE FROM DREDGE TO SPOIL AREA: ≈ 2500' maximum.
PUMPING ELEVATION: Approximately 8' to 10' maximum.
MATERIAL TO BE DREDGED: Silt or clay, mostly silt.
RECORDED ORDNANCE FIRED INTO ERF: ≈ 100,000 ( 10% = 10K UXOs).
O R D N A N C E S P E C I F I C AT I O N S
Mortar Rounds*
≈ 4 pounds
60 mm
Weight:
Diameter:
2 3/8"
Length:
9.614.7" (Total)
2.755" (Fin assembly)
≈ 10 pounds
81 mm
Weight:
Diameter:
3 3/16"
Length:
1324" (Total)
3.57.8" (Fin assembly)
≈ 26 pounds
107 mm
Weight:
Diameter:
4.2"
Length:
2026" (Total)
(No fin assembly)
Howitzer Rounds*
≈ 40 pounds
105 mm
Weight:
Diameter:
4.13"
Length:
16.9" (Total)
Unexploded ordnance
It has been estimated that 100,000 artillery rounds have been fired into ERF. The
standard stated dud rate for artillery rounds is on the order of 10% (4%20%). This
gives us a maximum of 10,000 rounds of unexploded ordnance (UXOs). There is no
way of telling how many of these still exist and are dangerous. If one assumes that
most UXOs were fired into heavily utilized areas or ranges, then a significant por-
tion of these duds may have been detonated or destroyed by subsequent incoming
rounds. Very few UXOs have been observed at or near the surface of the Flats,
although this is not necessarily an indication that there are very few UXOs. Mortar
*From FM 9-13, Ammunition Handbook (U.S. Army 1981). All rounds high explosive (HE).
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