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P.2
THE BOARD OF SUPERVISORS
OF CONTRA COSTA COUNTY, CALIFORNIA
DATE: June 4, 1996 MATTER OF RECORD
The Board of Supervisors heard a presentation by Julia May and Andy
Mechlin, communities for a Better Environment, demonstrating an
Open Path Infra-Red Monitor for the early detection of air borne
chemicals utilizing infrared technology, at the June 4, 1996,
meeting.
THIS IS A MATTER FOR RECORD PURPOSES ONLY
NO BOARD ACTION TAKEN
From Unocal's 6 month Test Program of ETWs FTIR Fenceline Monitor
Compound Name Maximum Concentration Detected during 6 months (parts per million)
Freon 11 .004
Freon 22 .024
Phenol
Diethanolamine .028
Hydrogen cyanide .040 (Visual evidence indicated may also have been detected at .294 ppm.)
Furan .068
111-TCA .009
MTBE 2.139
Ammonia .041
Toluene .752 (Was also detected at 1.2 ppm by cannister sampling.)
o-Xylene .297
m-Xylene .117 (Inconclusive visual evidence also found this at.214 ppm.)
p-Xylene .026
Napthalene .038
1-3, Butadiene .106
Sulfur Dioxide
Acetaldehyde .771
Phosgene
Ethylene .122
Ozone .088
Benzene .171
Methane 8.979
Carbon,tetrafluoride .021 (This compound is used for testing purposes.)
Carbon Disulfide .096
Carbon Monoxide 1.596
Carbonyl sulfide (Was detected at .020 ppm by spot sampling with cannisters:)
Nickel carbonyl
Formaldehyde .014
HCI:
iso-Octane 1.649 -RECEIVED
n-Octane 11.546
FjK
Propane .603
Butane 5.979 JUN - 4 1996
Ethane 2.784 Ethyl benzene .628 BOARD OF SUPE
RVOM
Dimethyl sulfide CONTRA COSTA co
Methyl mercaptan
Hexane .412
Dimethyl disulfide
-Blank spaces above indicate compound was not detected.
-The following compounds were-detected by conventional cannister sampling also done during
the.6-month FTIR test: Acetone(.017 ppm),Ethanol.(.027ppm),Methylene chloride (.0059
ppm), Benzene .0014),Toluene (1.2E ppm), 1,2,4-Trimethylbenzene (.0016J), Bromomethane
(.0021), Carbonyl sulfide (.020 ppm)
Compiled by Julia May, CBE 6/3/96 From Appendices A&I, "Final Report for FTIR Fenceline
Monitoring Program," ENSR, March 1996.