AQ_F_0800107_20101216_MOD_ModRvw_Analysis

Division of Air Quality
December 16, 2010
MEMORANDUM
TO: Betsy Huddleston, Environmental Engineer, WARO
Permit Coordinator, WARO
THROUGHt Jim Roller, Supervisor, AQAB
FROM: Tom Anderson, Meteorologist II, AQAB
SUBJECT: Dispersion Modeling for W. E. Partners—Wellons Energy C E V
Facility ID: 0800107
Lewiston Woodville,NC Bertie County N7V 2 8 2011
DAQ WARO
Per your request, I have conducted a dispersion modeling analysis 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 was conducted as a revision to modeling that was recently approved by the AQAB (ref.
Dec. 16, 2010 memo) due to a proposal to install an ESP on each of the previously modeled
multiclones. The modeling adequately demonstrates compliance, on a facility-wide basis, for all
toxics modeled.
Nine toxics were evaluated in the analysis and the attached table provides the emission rates for
each of the boilers. An attached table also provides the stack parameters for the ESP. Since the
three boilers and associated ESP's are identical and are located adjacent to one another, all
emissions were assumed to occur from a single centrally-located stack.
AERMOD using the latest available year(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 BPIF 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 % of AAL
Acrolein 1-hour <1 %
Arsenic Annual <1 %
Benzene Annual 37%
Beryllium Annual <1 %
Cadmium Annual <1 %
Chlorine 1-hour 2 %
24-hour 1 %
Formaldehyde 1-hour 7 %
Hydrogen chloride 1-hour 11 %
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

Toxic Potential
Emission
CASI
Acrolein 107-02-8 0.003lb/hr
Arsenic & Compounds (total mass 0.3 lb/yr
of elemental AS, arsine and all
inorganic compounds)
(ASC (7778394)
Benzene (71-43-2) lbs/yr
Beryllium Metal (unreacted) 0.3 lb/yr
(Component of BEC) 7440-41-7
Cadmium Metal, elemental, 0.3 lb/yr
unreacted
(Component of CDC) (7440-43-9)
Chlorine(7782-50-5) 0.007 lb/hr
Formaldehyde (50-00-0) 0.08 lb/hr
Hydrogen chloride(hydrochloric 0.14 lb/hr
acid)
7647-01-0)
Manganese& compounds (MNC) 0 .07 lb/day
Source Stack Stack
ID Easting (X) Northing (Y) Base Elev. Height Temp. Exit Vel. Diam.
(m) (m) (m) (ft) ('F) (fps) (ft)
ESP 300091 4001777.81 25.46 69.5 275 521.09 4.17
i