4.12 Air Quality
Therefore there would be no air quality impacts. Finally, the RONA for Alternative 1 would also apply
to this alternative.
Table 4.12-2
Alternative 2a Estimated Emissions
Total Emissions - tons
Emission Source
CO
ROC
NOx
SOx
PM10
Support Boats
1.96
0.42
3.94
0.49
0.16
Mobilization and Demobilization
0.11
0.04
0.39
0.04
0.03
Sand Placement
0.44
0.15
2.19
0.56
0.27
Total Construction Equipment Emissions
2.5
0.6
6.5
1.1
0.5
General Conformity de minimis Thresholds(1)
100
50
50
100
100
Exceed threshold?
No
No
No
NA
NA
SDAB forecast emissions for 2010(2)
317,550
65,700
54,750
4,380
54,750
Exceed ten percent of SDAB emissions?
No
No
No
NA
NA
Permitted Emissions Sources
Dredge
2.86
41.14
209.10
12.60
13.48
(3)
Slurry Booster Pump Engine
0.95
0.13
4.32
0.07
Total Emissions, including permitted sources
6
42
220
14
11
(1)
De minimis thresholds for SDAB nonattainment pollutants VOC and NOx, and maintenance pollutant CO. The
basin is in federal attainment for PM 10; de minimis thresholds for SOx and PM 10 nonattainment are used for
NEPA and CEQA significance determinations.
(2)
Forecast emissions from California ARB 2000. Forecast emissions for 2000-2001 would differ from those for
2010, but the differences would be small compared with the totals. The order of magnitude is satisfactory for
comparison with project emissions.
(3)
Emission factor not provided in source document.
Mitigation Measures for Alternative 2a
Because there would be no significant impacts, no mitigation is required.
Impacts/Mitigation Measures for Alternative 2b
Under this alternative, construction would occur over a start-stop schedule instead of continuous. It would
be necessary to obtain an Authority to Construct and Permit to Operate from APCD for the dredge
operation. Dredge(s), support boats, booster pumps and construction equipment would generate
emissions. While the duration of construction would be longer overall, the total estimated emissions would
Regional Beach Sand Project EIR/EA
Page 4.12-7
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