The job description suggests that this operator is primarily responsible for sanitation. I haven't found much on the Internet, but there is this, from California, which looks pretty similar:

"Bottling Sanitation Operator
Summary/Objective:
The Sanitation Operator sanitizes all bottling equipment to ensure the quality and integrity of our finished products. The position follows standard work methods and practices safe work habits to ensure production is as efficient and safe as possible.
Essential Job Functions:
•Sanitizes, cleans and monitors all cellar and bottling equipment needed to feed, filter, fill and cork the final product.
•Sanitizes, cleans and monitors pumps, hoses, bottle blowers, corkers, filtration equipment, cappers and membrane filter housings and surrounding area.
•May document temperatures, filter through-puts, filter pressures and wine volume pre and post production.
•Performs tasks to support bottling line product changes as production needs arise to ensure proper sanitation.
•Responsible for compliance with CBI sustainability policies and practices which are economically viable, socially acceptable and environmentally sound."
http://ftp.jobcentral.com/feeds/ConstellationBrands.xml