L ATLANTICENVIRONMENTAL

Solvents RecoverySouthington, Connecticut

024539

November 4,1988PROJ. 0650-0597

1.0 INTRODUCTION

An industrial hygiene survey was conducted by Atlantic

Environmental, Inc. at Solvents Recovery Service in Southington

Connecticut, on November 4, 1988. The purpose of the survey was to

determine employee exposure to solvent vapors.

2.0 OBSERVATIONS

Operations at this plant consist of recovering solvents from

waste products such as inks, dyes, and waste paints. The operations

consist of receiving 55 gallon drums of waste material, debunging

the drums, dispersion of waste solvents by resuspending waste paints

into solution using a high speed mixer, and vacuum pumping the waste

materials out of the drums and into storage tanks.

3.0 SAMPLING EQUIPMENT AND METHODS

Personal air monitoring was conducted on employees to determine

their actual 8 hour time weighted average (TWA) exposures to the

various solvent vapors. The solvents in question, and their

respective sampling and analytical methods are as follows:

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JAN 2 6 19

024540 ATLANTIC

i mmm ' ENVIRONMENTAL ^ Solvents Recovery November 4,1988

Southington, Connecticut PROJ. 0650-0597

TLV's PPM

1) Methyl ethyl Jcetone 200 590 Methyl isobutyl ketone 50 205 Butyl acetate 150 710 Ethyl acetate 400 1400 Toluene 100 375 Xylene 100 435 Acetone 750 1780 Stoddard Solvent 100 525 Methlene chloride 100 350 Trichloroethylene 50 270 III Trichloroethane 350 1900 Perchloroethylene 50 335

Personal air monitoring for these compounds was accomplished by

employing battery powered air sampling pumps to draw a known volume

of air through activated charcoal sorbent tubes. These tubes were

then sent to MDS Laboratories (AIHA No. 135) for analysis by gas

chromatography, in accordance with NIOSH P&CAM No. 127

TLV's PPM mg/m-3­

2) Isopropanol 400 980 Butanol 50 150 Methyl Cellosolve(2 Methoxyethanol) 5 16

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024541 ATLANTIC

' ENVIRONMENTAL *• Solvents Recovery November 4,1988

Southington, Connecticut PROJ. 0650-0597

Personal air monitoring for these compounds was conducted by

employing the 3M Organic Vapor Monitor #3500, a passive dosimeter.

These monitors were clipped to the employee's shirt lapel and worn

throughout the entire work shift.

The organic vapor monitors were sent to MDS Laboratories for

analysis, in accordance with NIOSH P&CAM Nos. S-65, S-66, and S-79.

TLV's PPM mg/m­

3) Methanol 200 260

Only area monitoring for methanol was conducted. These samples

were taken at 2 separate locations outside adjacent to the

dispersion area. The samples were collected by drawing a known

volume of air through silica gel tubes. These sorbent tubes were

analyzed for methanol by MDS Laboratories in accordance with NIOSH

P&CAM No. S-59.

4.0 RESULTS

All ACGIH-Threshold Limit Values (TLV's) were used to determine

if an individual's exposure to the various solvents were in excess

of recommended limits. In order to determine if the employee's

overall exposure to these chemicals were within the TLV's, we had to

look at each of these chemicals as presenting additive effects.

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024542 ATLANTIC

ENVIRONMENTAL Solvents Recovery November 4,1988 Southington, Connecticut PROJ. 0650-0597

Therefore, we employed the ACGIH recommended formula for determining

TLV's for mixtures. The general formula, where air is analyzed for

each component, for the TLV of the mixture is:

C2/T2+ C3/T3C1/T1+ + ''' ="n"

C-j = concentration of vapor found in the sample T-L = ACGIH Threshold Limit Value for this chemical

If "n" is found to be greater than 1, then the mixture is

considered to be in excess of the TLV.

We have designated "Eq Exp", or equivalent exposure, for the

TLV mixtures listed in the tables. Any "Total Eq. Exp" listed in

the tables which are less than "1" indicate that the individual was

exposed to solvent concentrations within the recommended TLV mixture

(See Sampling Results).

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024543 ATLANTIC

ENVIRONMENTAL Solvents RecoverySouthington, Connecticut

Tables Key

Table Listing

MEKMIBKBut AcetateEth AcetateTolueneXyleneStod SolvMethyl Chlor1,1,1 TriTrichlorPERKIsopropanolButanolMetyl CellMethanol

November 4,1988 PROJ. 0650-0597

Chemical Name

Methyl Ethyl Ketone Methyl Isobutyl Ketone

Butyl Acetate Ethyl Acetate

Toluene Xylene

Stoddard Solvent Methylene Chloride

1,1,1 Trichloroethane Trichloroethylene

Perchloroethylene Isopropyl Alcohol

Butyl Alcohol Methyl Cellosolve

Methyl Alcohol

"<" means less than laboratory detectable limit "Eq Exp" means equivalent exposure "Total Eq Exp" means total equivalent exposure

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024544 ^ ATLANTIC ^ ENVIRONMENTAL

^ Solvents Recovery November 4,1988 Southington, Connecticut PROJ. 0650-0597

5.0 CONCLUSION

Each chemical sampled and analyzed for was considered as having

an additive effect on the human body. Therefore, based on the ACGIH

recommended formula for determining TLV's for mixtures, equivilent

exposure values found to be greater than 1 indicate exposure levels

in excess of the TLV.

All samples collected on October 28, 1988 were found to have

total equivilent exposure values less than 1, indicating that the

additive exposure levels were below the TLV. In addition, each

individual chemical which was monitored during this survey was found

to be below their respective TLV's.

Page 6

V

024545 ATLANTIC

, __ l ENVIRONMENTAL Solvents Recovery November 4,1988

Southington, Connecticut PROJ. 0650-0597

SURVEY PERFORMED BY AND REPORT WRITTEN BY:

PAULA.VALVO

REPORT REVIEWED BY:

>e\v$A DAVID S.PEARSON, C\\f

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