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Page 1 of 2 <br /> �... VW, <br /> Mike Infurna [EH] <br /> From: Harms, Clint[Clint.Harms@stantec.com] <br /> Sent: Monday, July 14, 2008 1:04 PM <br /> To: Mike Infurna [EH] <br /> Subject: RE: Circle K 1205, Lathrop <br /> Mike —Lots of stuff. Just a few comments in red below. I hope this helps. Let me know if you need <br /> anything else. <br /> Clinton Harms <br /> Senior Scientist <br /> Stantec <br /> Ph: (916)861-0400 Ext. 228 <br /> Fx: (916)861-0430 <br /> Cell: (916)826-4186 <br /> clint.harms@stantec.com <br /> stantec.com <br /> The content of this email is the confidential property of Stantec and should not be copied, modified,retransmitted,or used for <br /> any purpose except with Stantec s written authorization. If you are not the intended recipient, please delete all copies and <br /> notify us immediately. <br /> (_0 Please consider the environment before printing this email. <br /> From: Mike Infurna [EH] [mailto:MInfurna@sjcehd.com] <br /> Sent: Monday, July 14, 2008 11:17 AM <br /> To: Harms, Clint <br /> Subject: RE: Circle K 1205, Lathrop <br /> whew, <br /> I've heard many many comments on your plan since your email July 1 . <br /> I'm still trying to get a WDR evaluation/answer from the CVRWQCB. I and Margaret <br /> asked for one but they addressed other things and never answered the WDR <br /> question. <br /> - Do you have a contingency plan for the Ozone system? We can develop one and <br /> include in our RAP/system design. The simplest contingency would be to switch <br /> from ozone to air sparge, When we design the trench layouts we can add a couple <br /> extra vapor extraction lines going to the north in case we have to switch to air <br /> sparge, at which time we would want to capture vapors due to high air flow and <br /> possible stripping effect. You and I know if a problem arises, you turn it off, right? <br /> But what do you plan to do if Cr-VI or Bromate shows up? Initially we would shut off <br /> the ozone and confirm attenuation of the Cr-VI and Bromate. If attenuation was not <br /> shown then GWE would have to be implemented. The go to GWE? The <br /> CVRWQCB was very interested in this. <br /> -what is the level of acceptance for attenuation of these compounds.. is 88% ok? <br /> 32 days ok? unanswered so far. Good question. I would think that an attenuation <br /> timeframe that showed attenuation prior to moving beyond the existing monitoring <br /> well field would be acceptable. We know that the groundwater within the immediate <br /> 7/14/2008 <br />