p.1 

OAR Box 1384 

Prepped by Charmelle Mathews 

Document Number: 

$2&i) ll-E-162 

Docket Number: 

A-94-52 

Printed 7/2/2008 8:42:10 AM Sheet 202 of 264 
P.2 

06/25/98 13:44 TEL 3032872576 

09/25/98 10:00 ©19199410234 

From: 

Date: 

Contact: 

Company: 

MESA FIBERGLASS 

PES RTP NC 

L£|U1 

®002/002 

A 94 52 

Contact Report 

Robert Jemison, Pacific Environmental Services, Inc. (PES) 

June 24,1998 

Mr. Robert R. Yoho 

Mesa Fiberglass, Inc. ' 

Telephone Number: (303) 287-2576 

Fax Number: (303)287-1385 

Contact Summary: 

Mr. Robert Yoho was contacted to update information provided in die 1993 EPA Reinforced 

Plastic/Composites Screening Survey submitted by Mesa Fiberglass, Inc. for their facility located 

in Commerce City, Colorado. In response to my questions Mr. Yoho indicated the following: 

The facility uses atomized spray lay-up to apply a polyester resin in the fabrication of certain 

corrosion-resistant products. The facility no longer uses! flow choppers to apply this polyester resin 

due to various processing problems that occurred during production. The polyester resin applied 

using atomized spray lay-up contains approximately 45% HAP by weight (45% styTene) and does 

not contain a vapor suppressant The company adds antimony trioxide to the resin when additional 

fire-retardancy is required in die final product No additional HAP is added to the polyester resin 

during or prior to the fabrication process with the exception of small amounts of HAP that may (or 

may not) be present in initiators, promoters and/or catalysts added to the resin. 

The faciUty uses die filament winding process to apply two separate vinyl ester resins in the 

fabrication of certain corrosion resistant products- The two vinyl ester resins used by the facility are 

Ashland's Hetron 922 L25 and Hetron 992 FR. The Hetron 922 L25 contains 47.0% HAP (47.0% 

styrene) and accounts for approximately 80% of the resin used with the filament winding process. 

The Hetron 992 FR contains 39.0% HAP (39.0% styrene) and accounts for approximately 20% of 

the resin used widi the filament winding process. The company adds antimony trioxide to the 

Hetron 992 FR resin when additional fire-retardancy is required in the final product Neither of the 

vinyl ester resins used in the filament winding fabrication process contain a vapor suppressant No 

additional HAP is added to either vinyl ester resin during or prior to the fabrication process with the 

exception of small amounts of HAP that may (or may not) be present in initiators, promoters and/or 

catalysts added to the resins. 

INFORMATION IS ACCURATE Q/MfJ/ 
06/25/98 13:44 TEL 3032872576 MESA fIbKKULASS 4)02 

P.3 

Contact Report 

Mr. Robert R. Yoho 

June 24,1998 

Page Two 

The facility uses atomized spray lay-up to apply two pigmented polyester gel coats in the 

fabrication of certain products. The neon blue polyester gel coat used by the faciUty contains 30.0% 

to 40.0% HAP by weight (30.0% to 40.0% styrene, 0.0% methyl methacrylate) and accounts for 

approximately 80% of the facility's total gel coat usage'. The dresden blue polyester gel coat used 

by facility contains 37.1% HAP by weight (32.7% styrene, 4.4% methyl metoacrylate) and accounts 

for approximately 20% of the facility's total gel coat usage. No additional HAP is added to either 

pigmented gel coat during or prior to the fabrication process with the exception of small amounts 

of HAP that may (or may not) be present in initiators, promoters and/or catalysts added to the gel 

coats. 

All resin mixing at the facility is conducted in open 55 gallon drums (i.e. the top of the drum 

has been removed prior to mixing). 

The facility uses acetone for the majority of its equipment cleaning operations (for equipment 

associated with the manufacture of reinforced plastics). The facility has one "soak tank" which 

contains methylene chloride that is used to clean equipment that is coated with or in contact with 

resin that has cured or "set up." The "soak tank" is covered at all times except when opened to add 

or remove equipment. 

INFORMATION IS ACCURATE 

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