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FW: Farewell and coolant-related machine shop question

Some insights from a machining expert & leader of a project relating to
environmental impacts of cutting fluids...

> -----Original Message-----
> From:	Tom McClure 
> Sent:	Monday, February 22, 1999 3:28 PM
> To:	CarolSchababerle
> Subject:	RE: Farewell and coolant-related machine shop question
> Carol,
> I do not agree with the author's assessment that the culprit must be the
> cutting fluid.  There would only be a small amount of residual cutting
> fluid left on the part as it goes into the rinse tanks.  This would be
> further diluted by the water in the rinse tank so I cannot envision the
> reaction continuing.
> As far the source of the lead, it may be coming from the brass or it may
> becoming from an outside souce.  Are the chains or baskets or any of the
> components that go into the dip tank with the parts lead containing?  It
> seems strange that the longer the parts sit in the bath, the higher the
> lead concentration. 
> Changing the coolant might help.  I'm not familiar with the Cincinnati
> Milacron coolant he mentions.  In picking a new coolant, the customer
> might want to check and see if the coolant vendor ran a copper strip
> corrosion test.
> Tom
> -----Original Message-----
> From:	CarolSchababerle 
> Sent:	Friday, February 19, 1999 10:05 AM
> To:	Tom McClure
> Subject:	FW: Farewell and coolant-related machine shop question
> Do we have any info re: cutting fluids (from the Green Fluids program?)
> that we could share ?
> -----Original Message-----
> From:	Vincent R. Perelli [SMTP:v_perelli@des.state.nh.us]
> Sent:	Wednesday, February 17, 1999 12:12 PM
> To:	p2tech@great-lakes.net
> Subject:	Farewell and coolant-related machine shop question
> Hi Folks,
> It is with some sadness that I post my last question to P2 Tech, (at the
> request of my Supervisor), as I am leaving the NH Pollution Prevention
> Program to take the Senior Planner position in the Commissioner's Office. 
> After a great run of 10 years, I am leaving a program that I helped to
> start
> from scratch (along with Paul Lockwood) out of the early days of
> Hazardous Waste Capacity Assurance (anyone remember working on
> CAP?)
> I've enjoyed working directly with many of you on, and off, this
> listserve. 
> I have also enjoyed some of the "electronic" relationships I've
> established
> with a bunch of you.   I have been nothing but impressed with the caliber
> and depth of knowledge and experience of folks on this listserve (and in
> the Technical Assistance Community).  
> On to bigger and not necessarily better things.  We'll see....
> Information
> requests, P2 conference planning, on-site assessments, and outreach
> literature are soon to be replaced with Strategic Planning, Performance
> Partnership Agreements, State of the Environment Report, and a bunch
> of workgroups, committees, and partnerships.
> Finally --- the question  -- 
> A machine company is sawing brass parts.  Following the cutting
> operation, the parts pass through two rinse tanks.  The first rinse is
> picking up lead and exceeding the 5 ppm limit for hazardous waste
> determination.  Since the rinse is tap water (I told him to check pH), the
> culprit appears to be the cutting fluid ("Valcool VNT 800" from Cincinnati
> Milicron).  They can't change the brass formulation but could change the
> coolant.  The owner says the longer the parts sit in the rinse water, the
> higher the lead level.  Has anyone heard of a similar problem?  Does
> anyone know of a good, non-aggressive coolant?  Are there other
> possible sources of the lead?
> Thanks everyone.   Keep up the great work that you all do.  I'm going to
> make sure that I maintain the P2 ethic in my new position.  Please keep in
> touch and I'll find opportunities for the same.
> Sincerely,
> Vincent Perelli
> NH Department of Environmental Services
> Pollution Prevention Program
> 6 Hazen Drive
> Concord, NH 03301
> 603 271-2902
> 603 271-2456
> v_perelli@des.state.nh.us