Dames & Moore, 1999 - USDA Forest Service

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TABLE 4.26
SUMMARY OF RIP RAP ASSESSMENT RESULTS
HOLDEN MINE RIPS
DAMES 8 MOORE JOB NO. 17693405019
Tailings Reach Length Ripiap Types Reach Characteristics' Rip-rap Grade
West of Tailings 1 -A 225 none no rip-rap along the 5 to 10 R high vertical to steep (> 45 ) river cut bank with exposed tailings absent
Tailings Pile 1
Tailings Pile 2
Tailings Pile 3
H:Violden\DraR Final RI rpt\S_4UablesW-2-5Jds
711 6/99
1-6 350 mosUy with
1 -C
1-0
1 -E
1 -F
2-As
2-An
2-8
2-C
2-0
2-E
2-F
3-A
3-8
X
200
300
210
160
210
225
350
160
350
475
760
550
435
160
. mostly with
mostly C with B
mostly C with B
mostly with
B and C
and
A and Bat south end.
with B with E at north
end
mostly C with B and
some E
approximately 6 R high grussified rip-rap at base of tailings, seedlings and saplings are
abundant on grussy riprap surface
slopewash has invaded riprap
~ ; ~ i ~ ~ ~ ~ ~ ;
and
and with at
west end .
B, with patches of
0
B and C, with patches
of A and D
A. B and C
approximately 6 R high gmssified rip-rap at base of tailings. seedlings and saplings are
abundant on grussy rip-rap surface
approximately 6 to 8 R high g~ssified rip-rap at base of tailings
approximately 8 to 9 R high grussified riprap at base of tailings; 1 to 3 R high brush is scattered
throughout the top of riprap and slopeward
approximately 5 to 8 R high grussified riprap at base of tailings; height decreases around bend
of tailings to southeast; riprap is sparsely covered with brush
approximately 6 to 8 R high grussified riprap at base of tailings
grussified riprap lies on steep bank; much of riprap is covered by slough material; with
scattered small bushes
large blocks of competent rip-rap; iron-stained at base
talus and block sloughs have covered rip-rap, so that hillslope blocks slough directly into creek;
riprap is generally competent but covered
grussified riprap covered with small brush and conifer saplings; inundated by slopewash; two
tall trees stand slone along mid-section of reach: otherwise riprap is against main channel
grussified rip-rap is inundated by tailings talus and covered by small bushes
partially grussified riprap is spread over a wide area (approx 25 R) and across a lowlope; west
section is covered with patchy scrub bushes; east section is densely covered with scrub
bushes
partially grussified riprap is covered with brush and occupies fairly narrow belt at base of
slope; talus is built up to crest of riprap
brushy, sparse
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poor
Poor
P r
poor
poor
Poor
poor
good
fair
fair
,air to poor,
fair to poor
fair to poor
fair
fair
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