AQ_F_0800107_20101101_MOD_ModRvw (3)

Division of Air Quality
November 1, 2010
MEMORANDUM
TO: Betsy Huddleston, Environmental Engineer, WARO
Permit Coordinator, WARO
THROUGH: Jim Roller, Supervisor, AQAB
FROM: Tom Anderson, Meteorologist II, AQAB
SUBJECT: Dispersion Modeling Review for W. E. Partners—Wellons Energy Solutions
Facility ID: 0800107
Lewiston Woodville,NC Bertie County
I have reviewed the dispersion modeling analysis, received October 12, 2010, for the proposed
W. E. Partners—Wellons Energy Solutions biomass cogeneration facility that will be located in
Lewiston Woodville,NC. The company is planning to construct and operate three biomass
boilers at the existing Perdue Farms facility and has triggered review requirements for several
toxics whose emissions are expected to exceed the levels outlined in NCAC 2Q .0700. The
modeling adequately demonstrates compliance, on a source-by-source basis, for all toxics
modeled.
Nine toxics were evaluated in the analysis and attached Table 3-1 provides the emission rates for
each of the boilers. Attached Table 3-2 provides the stack parameters for the three identical
boilers.
AERMOD using five years (1988-1992) of meteorological data from Norfolk, VA (surface) and
Wallops Island, VA(upper air) was used to evaluate impacts in both simple and elevated terrain.
Direction-specific building dimensions, determined using EPA's BPIP program (95086), were
used as input to the model for building wake effect determination. Receptors were placed around
the facility's property line at 100-meter intervals and extended outward to a distance of
approximately 5 kilometers using a nested grid. All toxics were below their respective AALs and
the following table shows the maximum impact for each toxic:

Table 1.
Maximum Impacts
Wellons Energy—Woodville Lewiston,NC
Averaging
Pollutant Period 0/0 of AAL
Acrolein 1-hour 2 %
Arsenic Annual 91 %
Benzene Annual 34%
Beryllium Annual <1 %
Cadmium Annual <1 %
Chlorine 1-hour <1 %
24-hour <1 %
Formaldehyde 1-hour 1 %
Hydrogen chloride 1-hour 1 %
Manganese 24-hour 1 %
This compliance demonstration assumes the source parameters and pollutant emission rates used
in the analysis are correct.
cc: Jim Roller
Tom Anderson
Lori Cherry, TPB

TABLE 3-1. FACILITY-WIDE EMISSION RAM
Emission
Pollutant Rote TPER Units
Acrolein 0,4 0.020 lb/hr
Arsenic 11,2 0.016 lWyr
Benzene 2132 8.1 Iblyt i
Beryllium 0.6 0,28 lwyr
Cadmium 2.1 0.37 Iblyr
Chlorine 1.7 0.79 lb/day
Fonnaldehyde 0.4 0,04 lb/hr
Hydrogen Chloride 1.7 0.18 lb1hr
Manganese 3.4 0.630 lb/day
bo, f�1,41-
TABLE 3-21. POINT SOURCE MODEL STACK I'ARAAIFTFkS
(fait U) Stock fleight Stack Temp Stack Flow Stack Diameter
(ft) (F) (ACF" (ft)
Boiler 75 325 14,775 2.50