Draft Programmatic
Environmental Impact Statement/Environmental Impact Report
San Francisco Estuary Invasive Spartina Project: Spartina
Control Program
April 2003
|
Table 3.1-2: Summary of Mitigation Measures for
Hydrology and Geomorphology |
||||||
|
Mitigation |
Manual |
Mechanical |
Pruning, Hand-mowing, and
Smothering |
Flooding |
Burning |
Herbicide |
|
Mitigation GEO-1: Erosion or deposition of sediment. In sites of cordgrass removal where unacceptable
increases in erosion rates (significantly greater than background levels or
threatening the stability of existing infrastructure such as access roads or
utility structures) are likely, temporary physical erosion controls shall be
established until sediments either consolidate or stabilize naturally. |
Applicable |
Applicable |
Applicable |
Applicable |
Applicable |
Applicable |
|
Mitigation GEO-2: Erosion or topographic change by vehicles used in eradication. Vehicle travel in the tidal marsh
and mudflat shall be minimized. Mats shall be used to distribute the weight
of vehicles on marsh surfaces wherever feasible. Sensitive sites that could
be significantly impacted by erosion or sedimentation from overland vehicles
shall be accessed by boat. |
Not Applicable |
Applicable |
Not applicable |
Not Applicable |
Applicable |
Applicable |
|
Mitigation GEO-3: Remobilization of sand. Resumed erosion at sensitive locations shall be mitigated
by sand nourishment or repair or replacement of existing rock slope
protection or existing erosion control structure. |
Applicable |
Applicable |
Applicable |
Applicable |
Applicable |
Applicable |
|
Mitigation GEO-4: Sediment disposal.
Sediments dredged from treatment sites shall be disposed of as prioritized in
the Long Term Management Strategy for Bay dredged material. These sediments shall not be disposed
of in dredge disposal sites in the Estuary or offshore where seeds may be
dispersed elsewhere in the Estuary or to other coastal estuaries. They shall be disposed of in upland
disposal sites or at depths in sites proposed for tidal marsh restoration. |
Not Applicable |
Applicable |
Not Applicable |
Not Applicable |
Not Applicable |
Not Applicable |
Note: There may be textual differences between the measures in this summary table and the text in the section. The actual mitigation measure is in the text.