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Intel
- SCREEN 3 model with the following conditions;
- Operation 24 hours/day - 365 days/year
- Emission point at one scrubber vs. seven scrubbers (one is more conservative)
- Model @ 10 Tons per year routine release from a single release point as referenced above;
- Volumetric flow rate is 60,000 cfm or (60,000 ft3/min.)(m3/35.32 ft3)(min./60sec.) = 28.33 m3/sec
Final Project Agreement -- Air Emissions Screening Model
Model Used: U.S. EPA SCREEN 3 (1991-1996, Trinity Consultants Inc. Version 1.0)
AZ Agency: Maricopa County Environmental Services Department Duration used by MCESD: MCESD has used this model since 1990 Model Type: Gaussian model Model Application: Continuous emissions vs. episodic event Model Purpose: Conservative model to help compare emissions to AZ Ambient Air Quality Guidelines to ensure public health is protected Intel Assumptions in Running the SCREEN 3 Model:
SITE: Rural terrain SOURCE: - Point Source - Distance to property line, 479 m - Emission rate, 0.288 g/s - Stack height, 31.2 m - Stack I.D., 1.56 m - Stack Velocity 15 m/s - Temperature 273º K DOWNDRAFT: Bldg. dimensions; L/W/H, 700'/425'/80' or 219m/133m/25m FUMIGATION: Inversion Break-up (Rural only) METEOROLOGY: Full meteorology
(20klbs HAP/yr)(yr/365 days)(day/24hrs)(hrs/60min)(min./60sec)(lbs/453.6 g) =
0.288 g/sec
where Q = VA w/ A = r2 , A = (0.6m2) , A = 1.9 m2
V = Q/A or (28.33 m3 /sec) / (1.9 m2 ) = 14.9/m sec