CEE 490/ENVH 461 Name_________________________________

HW Problem 3 Styrene Air Pollutant Conc. Due Oct 9, 2008 at class time

Given: FRP Industries has submitted an application for a permit to construct a new

manufacturing plant to produce fiberglass reinforced plastic items (hot tubs, etc.) near the

town of Flatplain, WA in Pierce County (which is under the jurisdiction of the Puget Clean

Air Agency). Note that the terrain is flat and level in Flatplain and the countryside is rural.

The process emits styrene vapors which are exhausted from the building through a stack

which was less than GEP (good engineering practice height) in the initial application for

permit to construct.   H_G = H + 1.5L where: H_G = GEP stack height     H = height of nearby

structures     L = lesser dimension (height or width) of any nearby structure

Some emission details are:	Initial Permit Application	With GEP Stack
Stack Height	24 ft (7.315 meters)	60 ft (18.288 meter)
Styrene Emission Rate	20 grams styrene/sec	20 grams styrene/sec
Stack Inside Diameter	3.048 meters (10 ft)	3.048 meters (10 ft)
Stack exit gas velocity	36 ft/sec (10.97 meters/sec)	36 ft/sec (10.97 meters/sec)
Stack exit gas temp	300^oK (80^o6 F)	300^oK (80^o6 F)
Ambient Air Temp	288^oK (59^oF)	288^oK (59^oF)
Building Height	20 ft ( 6.096 meters)	20 ft ( 6.096 meters)
Building Width	15.24 meters (50 ft)	15.24 meters (50 ft)
Building Length	200 ft. (60.9 meters)	200 ft. (60.9 meters)
Distance to property boundary	5 meters.	5 meters.

ASIL=1,000 mg/m³ (revised from 716 ug/m³ averaged for 24-hours for styrene (Type B Air Toxic)

Receptor Height (PSCAA) = 1.5 meters

Detailed information on a similar plant (LASCO Bathware, Yelm) can be found in the Olympic Region

Clean Air Agency web site at http://www.orcaa.org/programs/aops.php

Find: As the governmental agency environmental engineer responsible for reviewing

this application for permit to construct, determine:

	Initial Permit Application	With GEP Stack
a Highest 1 hr av conc (microgram/m^3)
b Highest 24 hr av conc (microgram/m^3)
c Downwind distance to location of maximum styrene conc (meters)	Inside Bldg Cavity
d Wind Velocity @ 10 meters (m/sec)	Critical in Cavity
e Atm Stability Class for max. conc.	C or D based on wind velocity
f Does 24 hr av conc. exceed ASIL of 1,000 micrograms/ m^3

Attach a copy of the TSCREEN calculation results for the initial permit application (24 ft stack height).

Note that the maximum styrene concentration will be in the downwind building cavity for the 24 ft stack height.

The 24 hr average air pollutant conc. = 0.4 (1 hr average air pollutant concentration)