Document 91ZoLgL6nbjrzy6r4RgdrLL8V
TO: Distribution
Interoffice Communication
FROM: DATE:
SUBJ 2
T. G. Grumbles July 24, 1986
LCCC GROUNDWATER PROJECT MEETING
Enclosed are the draft minutes from the last G&M, Conoco, Vista meeting. Please review and call me with comments. Gary Wojnowski should collect comments from Conoco and G&M and arrange for a conference call to finalize the minutes.
Thomas G. Grumbles
ajo/9
Enclosure
DISTRIBUTION:
Mike Hayes Jack Neeld Gary Wojnowski Ron Truelove Peter Lacko
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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.
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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