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Page 1 of 3 <br />Michelle Henry [EH] <br />From: Raymond von Flue [EH] <br />Sent: Tuesday, April 19, 2011 2:48 PM <br />To: Michelle Henry [EH] <br />Subject: FW: pH Target Values <br />From: Rodney Estrada [EH] <br />Sent: Tuesday, April 19, 20119:35 AM <br />To: Raymond von Flue [EH] <br />Cc: Kasey Foley [EH]; Willy Ng [EH] <br />Subject: FW: pH Target Values <br />From: Timothy O'Brien [mailto:tobrien@waterboards.ca.gov] <br />Sent: Wednesday, April 06, 20118:22 AM <br />To: Edward Morris <br />Cc: MarkHinkle; Rodney Estrada [EH]; Cliff Raley <br />Subject: Re: pH Target Values <br />Thanks for the information Ed, I will consider the information. I'll be preparing the letter we discussed in the next <br />couple of days and if I think discussion is warranted, I'll give you a call or e-mail. <br />Timothy R. O'Brien <br />Engineering Geologist <br />Central Valley Regional Water Quality Control Board <br />11020 Sun Center Drive, #200 <br />Rancho Cordova, CA 95670-6114 <br />916-464-4616 <br />916-464-4775 fax <br />tobrien@waterboards.ca.gov <br />>>> Edward Morris <emorris@processpecialties.com> 4/5/2011 8:31 PM >>> <br />Timothy, <br />Thank you for coming out last week and for enlightening us on how pH effects septic tanks and how they work in general. <br />You are also the first one in 22 years of regular inspections by various agencies (including the EPA), to say that our <br />wastewater pH was too high. <br />Anyway we have been working on lowering the pH of our wastewater discharge from the 9-11 range to down to a lower <br />range. So far we have been able to get into the high sevens and low eights. In our experimentation it is proving very difficult <br />to get much lower than that, but we are continuing to work on it diligently. <br />What is happening is when the pH gets around 5.9-6.2 or so, the addition of only one or two more drops of caustic soda to <br />6/15/2011 <br />