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0011im.jpg){kind=tracking} (ITM) (USEPA and USACE 1998). They note the vast majority of dredged material is
chemically compatible for use in beneficial applications. Beach fill is also considered a
beneficial use of suitable upland material (Russ Kaiser, USACE, Personal Communication,
2000). Proposed dredged beach fill material often is not required to undergo chemical or
biological testing, if grain size and contamination information indicates compatibility. The focus
of public agencies (USACE, USEPA, RWQCB, and CCC) tends to be on grain-size
compatibility, placement timing, and contaminants. Because material from upland sites has
experienced different environmental and human influences than dredged material, it may require
different testing considerations for a suitability determination.
The permits would provide BEACON and its member agencies with a certain degree of
discretionary authority to approve appropriate projects with notification to the USACE, and
concurrence from permit agencies for each project. Discretionary approval would still be
retained by the permit agencies for projects not meeting all of the specified criteria, or possessing
characteristics outside of specified limits. At no time would permit agencies be expected to
relinquish entire discretionary approval; they would always have the option to require an
individual permit for a project. As part of the program, BEACON proposes to notify each
agency of a pending project and request concurrence within approximately 30 days prior to
construction of each project.
1.3
PURPOSE OF THIS REPORT
The purpose of this report is to provide technical criteria for the South Central Coast Beach
Enhancement Program, provide conceptual beach fill designs, and identify potential sand sources
and sand transport modes. The report recommends specific criteria for material suitability based
on grain size, chemical characteristics, color, and other properties. It recommends specific
placement locations, rates, and timing to proactively minimize environmental impacts.
Monitoring of beach fill projects is also recommended. One program goal is to maximize the
benefits of the beach enhancement activities with environmental sensitivity.
Technical considerations for the placement of beach fills are:
1.
Chemical and biological constituents of beach fill;
2.
Grain sizes (beach fills may consist of mostly sand with a range of cobble-gravel-sand-
silt-clay; special emphasis is placed on analyzing silt and clay fractions which may
increase turbidity, contain chemicals, and cover offshore reefs);
3.
Color (mainly an aesthetic consideration and usually not a critical factor if the material is
placed below the mean high tide line);
4.
Particle shape (angular or sharp particles can detract from the comfort of beach users);
5.
Debris content (the beach fill must not contain litter, trash, or significant quantities of
organics);
6.
Compactability/moldability of proposed beach fill (the material must not possess the
tendency for hardpan formation);
1-3
Moffatt & Nichol Engineers
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