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
Removal
(Hand pulling and manual
excavation)

Mechanical
Removal
(Excavation, dredging, and shredding)

Pruning, Hand-mowing, and Smothering

Flooding
(Diking, drowning, and salinity
variation)

Burning

Herbicide
Application

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.