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Page 1 of 1 <br />Michelle Henry [EH] <br />From: Raymond von Flue [EH] <br />Sent: Tuesday, April 19, 2011 2:47 PM <br />To: Michelle Henry [EH] <br />Subject: FW: pH Target Values <br />From: Rodney Estrada [EH] <br />Sent: Tuesday, April 19, 2011 9:33 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: Friday, April 01, 2011 3:27 PM <br />To: emorris@processpecialties.com <br />Cc: Rodney Estrada [EH]; Cliff Raley <br />Subject: pH Target Values <br />Ed, <br />My reference material indicates typical septic tank effluent should be in the pH range of 6.5 to 7.2. I'm willing to <br />expand that to 6.5 to 7.5 as the target range. I'll be preparing a letter describing my visit and specifying what <br />tests we would like you to run before determining the lead agency. You had mentioned that you would begin <br />experimenting to better control the pH. Please keep me posted on the progress and let me know if you have any <br />questions. <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 />6/15/2011 <br />