Document 6B6gOkMV75321zYZwRxe26rbg
TO: Distribution
Interoffice Communication
FROM: DATE:
SUBJ:
T. G. Grumbles November 12, 1986
DISPERSION MODELING PLANNING MEETING
VISTA
The subject meeting will be held Friday, November 21 at the LCCP Safety Department conference room, from 9:00 a.m. - Noon. An agenda for the meeting, a general description of the modeling project, and a background letter is attached.
Please note Item IV and be thinking about what would be useful for aiding the plant in the reporting of emergency releases to local and federal authorities and community right-to-know aspects of recent regulations.
If you have questions before the meeting, please call me (X3445) or Mary Jo Heller (X6884) in Houston.
) s cr^Thomas G. Grumbles
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Attachments
cc T. H. Huffman -- LCCP
L. R. Bauer
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R. A. Conrad
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J. A. DeBernardi - LCCC~ >
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AGENDA
MODELING MEETING FK1DA ,, NOVEMDER-4^
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I. Introduction Overview
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A. Purpose of Meeting
B. Modeling Needs/Uses
X fi A c,i\ .iL C. Regulatory Concerns (TSCA, Superfund)
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II. Modeling Technology A. Capabilities B. Limitations
III. Vista Capabilities A. Software Programs B. Schedule
V IV.X End Products
A.'V.Format ^onp^raphs, Numbers, Overlays?) B. Uses
Mary Jo Heller Mary Jo Heller <^ Group
V What To Model A. Chemical Selection B. Data Needs
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MODELING PROJECT
GOAL To produce data that will allow Vista to assess future releases in terms of potential for off-site concentrations of hazardous chemicals.
METHOD
Model release scenarios to give quantitative ranges of contaminent
levels under specified conditions.
Variables will include
contaminant, release rate and points, and atmospheric conditions.
STEPS 1. Obtain capability, including evaluation of models, software,
and training to model in-house.
2. Evaluate use of the modeling data for future use in release response and determine format of end-product as indicated.
3. Identify chemicals to be modeled at each plant. These should
be prioritized based on hazard, volume, use, storage, and
delivery (transfer) conditions.
Hazard evaluation should
include volatility, flammability and toxicity.
4. Based on the above choose release scenarios to evaluate off-site concentration potentials.
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5. Determine criteria levels for action (notification, evacuation, etc.) for those contaminants modeled.
GENERAL CONSIDERATIONS Many of the steps outlined can be done concurrently. The tendency will be to use intuition to pick the contaminants of concern. A consistent technique of hazard prioritization should be used to pick the chemicals to be modeled. The end result may be the same but we may be surprised. A screening method example is attached. This method was contained in EPA's Chemical Emergency Preparedness Program. The action level will take a good deal of discussion on any specific contaminant. Basically the affect to be avoided (irritation, lung damage, etc.) and the level where those effects occur must be reviewed. Acutely toxic materials (i.e., HF or HC1) are easier to deal with than VCM, or chronic hazards.
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