Draft Programmatic Environmental Impact Statement/Environmental Impact Report
San Francisco Estuary Invasive Spartina Project: Spartina Control Program
April 2003

Table 3.2-6:  Summary of Potential Water Quality Effects

Impact

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

Beneficial Effects

WQ-1: Degradation of Water Quality due to Herbicide
Application

All Alternatives:
No impact.

All Alternatives:
No impact.

All Alternatives:
No impact.

All Alternatives:
No impact.

All Alternatives:
No impact.

Alternatives 1 & 3:
Minor impact

Alternative 2:
No impact.

N/A

WQ-2: Degradation of Water Quality due to Herbicide Spills

All Alternatives:
No impact.

All Alternatives:
No impact.

All Alternatives:
No impact.

All Alternatives:
No impact.

All Alternatives:
No impact.

Alternatives 1 & 3:
Potentially significant and mitigable impact

Alternative 2:
No impact.

N/A

WQ-3: Degradation of Water Quality due to Fuel or Petroleum Spills

 

All Alternatives:
No impact.

All Alternatives:
Small potential for spill.

 

All Alternatives:
Small potential for spill.

 

All Alternatives:
Small potential for spill.

 

All Alternatives:
Small potential for spill.

All Alternatives:
Small potential for spill.

 

N/A

WQ-4: Degradation of Water Quality due to Contaminant
Remobilization

 

Alternative 1-2:
Small potential

Alternative 3:
No significant impact.

Alternative 1:
Small potential

Alternative 2:
Potentially
significant

Alternative 3:
No significant effect

 

All Alternatives:
No adverse
impacts.

 

Alternative 1:
Small potential

Alternative 2:
Potentially
significant

Alternative 3:
No significant effect

 

All Alternatives:
No adverse
impacts.

 

All Alternatives:
No adverse
impacts.

N/A

WQ-5: Water Quality Effects Resulting from Sediment
Accretion

Alternatives 1 & 3:
No effect

Alternative 2:
Insignificant effect

Alternatives 1 & 3:
No effect

Alternative 2:
Insignificant effect

Alternatives 1 & 3:
No effect

Alternative 2:
Insignificant effect

Alternatives 1 & 3:
No effect

Alternative 2:
Insignificant effect

Alternatives 1 & 3:
No effect

Alternative 2:
Insignificant effect

Alternatives 1 & 3:
No effect

Alternative 2:
Insignificant effect

Clarification of the water column may benefit some species