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.04 <br /> Alison Youngblood <br /> From: David.DeJong@us.jdsunph.com <br /> Sent: Wednesday, May 03, 2000 1:55 PM <br /> To: ayoungblood@phs.hs.co.san-joaquin.ca.us <br /> Subject: Etch sink <br /> Hi Alison, <br /> have to apologise for not contacting you sooner. I have been out for a <br /> couple weeks. <br /> While I was out manufacturing etched once. They etched again this past <br /> Monday and I was able to get some info for you. It looks like they etch <br /> once every two weeks. <br /> Measurements were taken of the rinse water before it was dumped into the <br /> holding tank beneath the etch sink. The rinse tank fills to a level of <br /> approximately 4.5 gallons. The measurement was taken after the parts were <br /> placed in the water before the spray rinse was activated. Once the spray <br /> rinse is activated the rinse water is dumped and the rinse tank refills. <br /> The holding tank has a capacity of 100 gallons. Due to the location of the <br /> drain the holding tank always has a buffer of 50 gallons. The holding tank <br /> is an individual tank within the etch station with the station acting as a <br /> second containment. <br /> When parts enter the rinse after the Sodium Hydroxide solution the rinse <br /> water pH was 9 <br /> When parts enter the rinse from the Nitric Acid Solution the rinse water pH <br /> was 1 <br /> The Sodium Hydroxide solution is a 3.5% mixture. <br /> The Nitric Acid solution is a 35% mixture. <br /> Let me know if there is anything else you need..... <br /> David <br /> 1 <br />