AQ_F_0800107_20101216_MOD_ModRvw (3)

Division of Air Quality
December 16, 2010
MEMORANDUM
TO: Betsy Huddleston, Environmental Engineer, WARO
Permit Coordinator, WARO
THROUGHk- im Roller, Supervisor, AQAB
FROM: PH-Tom Anderson, Meteorologist II, AQAB
SUBJECT: Review of Dispersion Modeling for W. E. Partners—Wellons Energy Solutions
Facility ID: 0800107
Lewiston Woodville, NC Bertie County
i
I have reviewed the revised dispersion modeling analysis, received December 2, 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 was submitted as a revision to modeling that was recently approved by the AQAB
(ref. Nov. 1 memo) in order to establish facility-wide emissions limits rather than source-by-
source limits established in the previous modeling. The modeling adequately demonstrates
compliance, on a facility-wide 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 boilers. Since the
three boilers are identical and are located adjacent to one another, all emissions were assumed to
occur from a single centrally-located stack.
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 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 ou
approximately 5 kilometers using a nested grid. All toxics were be ® r i
the following table shows the maximum impact for each toxic:
DEC 2 2 2w
DAQ WARO

Table 1.
Maximum Impacts
Wellons Energy—Woodville Lewiston,NC
Averaging
Pollutant Period % of AAL
Acrolein 1-hour 2%
Arsenic Annual 96%
Benzene Annual 35 %
-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. �ACILJTYAVIDF. l,l'MlS,--JON R-%ff-'S
PtAlimint Rare TPER -1 bi
AmAelil
Ral.wlw
0.79
I crunakichyde OA 0-011 lb/hr
livdi-c-ger,Cliloridc 1.7 0.1 IS lb/hr
I -
3 L) lb!day
3-21.POM. SOURO- MOVEL STACK PARANICTERS
Stack I teight Stack Temp Stack Plo j Stack Diamelek-
(h)
4F) i (ACFr*t)
1
1
Boller 75 147775