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2. In gsneral, controlled land dispnsal-is prefsrred to aquaou~
diagosal in order to minl.r~iae ~he gg~lutiQn eff~ct pa ~Qwatic
biota and Water quality. ~
3. Land disposal areae should be ~iked or bulkl~acled.aad pro-
vided vith adequate weirs to a~sure the deposit aad..ra-
tention of spoil materials within the project areas aad
to minimize the rlin-off of aettled eolids. In order for
ponda to be effective, overflow devicee should.be placed
high enough to provide the settling velocitiea appro-
priate for the type of mater~als being dredged. Dikes
should be protected from erosion by seediag.,_soddiag,
rip-rap, or other stabilizing materials..
4. Where the aqueous disposal of spoil material i~.uaa~void-
able, particular care should be provided to.confiae the
operatioa with~n the project area. Spoil pile8 located
in bays, inlets, or other confined Water bodies should.
be oriented in such a way as to provide miaimuiu ob-
j structlon to natural tidal flu~hing action,
~
! S. Dredging and screening operations ehould be carried
E out in such a manner as to:
a. Prevent excessive disturt+ance of sili
and other detritus in the water course.
. •
b. Tailings from washing and screening
operations ahould be removed in ade-
- quately designed and constructed
ponds equippe3 Wfth weirs or by
other approved methods which will
insure the effective removal of
setteablt solide.
6. Dredging Caaals or Waterways - In construcii.oa projecLs_in-
volving canale and waterways. water qualitq can.fraqueatly
be p=eserved bq providing confinemeat of suapended.mauriala
~ vithin pools formed vithin locks`, dass, or.oLher flood con-
trol structuree In other inatances, coafiaement within
~ a pool can be obtained by the construction of temporarq dama.
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sooK 187' ~?~E 14 ;
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