Omya's Use of Biocides

OMYA IS THE LARGEST USER OF PESTICIDES IN VERMONT
Omya uses biocides in the production of calcium carbonate

List of Chemicals Used by Omya in Florence, Vermont as listed in NPDES permit

Biocides Used by Omya

AMA-490 (replaced Proxel GXL 2/97)	Bronopol	2-Bromo-2-nitropropane-1,3-diol
Proxel GXL (still being reported in use in 1999)	BIT	1,2-benzisothiazolin-3-one, Sodium hydroxide, dipropylene glycol
AMA-420 N521P	common name, dazomet. when used as a soil fumigant	Tetrahydro-3,5-dimethyl-2H-1,3,5-thiadiazine-2-thione
N-909	Sodium Hypochlorite Solution	12.5% Sodium Hypochlorite solution

P-1	Sodium ortho-phenylphenate, 20 tons spilled by Omya, Nov. 2000 OMYA Contaminant Spill Investigation Report	(1,1'-Biphenyl)-2-ol, sodium salt
N-922 AMA-415	antimicrobial	5-Chloro-2-methyl-4-isothiazolin-3-one 2-Methyl-4-isothiazolin- 3-one Magnesium Nitrate Cupric Nitrate

As reported to Vermont Department of Agriculture

Other Chemicals Used by Omya

Superfloc 208

flocculant

polyacrylamide polymer

Beckosol

Alkazine TO-DT

AB 70/30

CW93

King Lee Pretreat Plus

Pristerene-4911

surfactant

dispersant

aqueous solution of acrylate polymer

antiscalant

stearic acid

anionic polyacrylate

anionic polyacrylate

from 1997 Hazardous Communication Program for Omya employees
most recent version made available for review by the Vermont Agency of Natural Resources

OMYA Biocide Usage 1995 - 1999
in pounds of active ingredients

1995 697,505.49 total pounds of active ingredients	Proxel GXL AMA-420 AMA-415	19,197 678,098.49 210
1996 589,912.07 total pounds of active ingredients	Proxel GXL AMA-420 AMA-415	28,797 558,342.79 2,772.28
1997 667,942.70 total pounds of active ingredients	Proxel GXL AMA-420 AMA-415	38,392.50 627,920 1,631.20

1998
795,643.17 total
pounds of active ingredients

Proxel GXL
AMA-420
AMA-415

14,398.50
779,928.41
1,316.26

1999
499,887.46 total
pounds of active ingredients

Proxel GXL
N-922
P-1
N521P
AMA-420
AMA-415

4,795.77
1,036.85
33,235.59
20,931.04
438,032.43
1,955.78

1995-1999

3,250,890.89 pounds
of active ingredients

TOTAL Biocides
Used by OMYA

Table based on data from Vermont Department of Agriculture

Total Monthly Biocide Usage by Omya as recorded on Dec. 11, 2000

N 922 (9T579(metric)/month, at 1000 ppm v/v) = 20,415 lbs.
P-1 Preservative Solution (13T428 (metric)/month, at 2860 ppm v/v) = 29,080 lbs.
N-521 P (15T251(metric)/month, at 820 ppm v/v) = 33,311 lbs.
Sodium Hypochlorite Solution (12T685 (metric)/month) = 27,133 lbs.

TOTAL Monthly Usage of Biocides by Omya in 2000 = 109,939 pounds
(active & inactive ingredients)

TOTAL Pounds of Active Ingredients
"Cooling Tower" Category
Rutland County Year 2000

2-Methyl-4-isotiazolin-3-one	84.35
5-Chloro-2-methyl-4-isothiazolin-3-one	277.14
Dazomet	90,767.37
Sodium O-phenylphenate	73,155.80
Sodium hypochlorite	162,877.00
TOTAL	327,161.66

In 2000, Cooling Towers accounted for 91% of Total Pesticide Usage in Rutland County
OMYA's biocide usage is categorized under "Cooling Towers"

More than 95% of Rutland County's pesticide use is attributable to Omya's use of biocides
during the years 1995 - 1999.

Charts based on data from Vermont Department of Agriculture

Click on Charts to Enlarge

YEAR 2000 Rutland County Pesticide Usage Data
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