4.12 Air Quality
Table 4.12-1
Alternative 1a Estimated Emissions
Total Emissions - tons
Emission Source
CO
ROC
NOx
SOx
PM10
Support Boats
2.08
0.44
4.07
0.50
0.17
Mobilization and Demobilization
0.15
0.05
0.51
0.05
0.04
Sand Placement
0.43
0.14
2.13
0.54
0.27
Total Emissions
2.7
0.6
6.7
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
3.06
43.97
223.48
13.47
14.41
(3)
Slurry Booster Pump Engine
0.95
0.13
4.32
0.07
Total Emissions, including permitted sources
7
45
235
15
12
(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.
Pump Operation Emissions
As described in Section 2.4, booster pumps would be necessary where pipelines would convey sand, as
a slurry, to the receivers sites, and the conveyance distance would be approximately 10,000 feet or greater.
Booster pumps would be necessary along the length from the Oceanside to North Carlsbad receiver sites,
and to convey material to South Carlsbad North, Moonlight Beach, and Torrey Pines. The exact locations
of pumps is not known at this time. At some onshore locations, electric power may be available to drive
the pumps, and pollutant emissions would not be of concern. At other locations, including off shore, a
diesel engine would be required to drive the pump, and NOx emissions would an issue. If the pump engine
R
is over 50 brake horsepower (bhp), an Authority to Construct and Permit to Operate would be required,
R
as described above for the dredge engines. Dredge pumps may also be Registered with the California
R
ARB as described for dredge vessels.
R
Regional Beach Sand Project EIR/EA
Page 4.12-3
99-69\sect-04.12.wpd 7/19/00
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