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• • Page 2 of 4 <br /> based on ARCO's iso-cons for MtBE in all three zones, it appears ARCO <br /> doesn't have a MtBE problem, CP does... <br /> why is ARCO interested in monitoring a MtBE plume shown to be ON the CP <br /> site radiating outward? and unless I"m mistaken again, Figures 14, 15, and 16 <br /> in First Quarter 2009 are mislabled as First 2008? <br /> From: Westhoff, Brian [mailto:Brian.Westhoff@stantec.com] <br /> Sent: Wednesday, June 10, 2009 4:00 PM <br /> To: Mike Infurna [EH] <br /> Subject: RE: Arco 4932, 16 E. Harding Way, Stockton, CA - Monitoring and Sampling Plan <br /> Confirmation <br /> It's a downgradient location prior to a residential neighborhood. We would like to monitor for MTBE. <br /> Brian Westhoff <br /> Geologic Consultant <br /> Stantec <br /> 3017 Kilgore Road Suite 100 <br /> Rancho Cordova CA 95670 <br /> Ph: (916)861-0400 Ext.270 <br /> Fx: (916)861-0430 <br /> Cell: (916)412-2459 <br /> brian.westhoff@stantec.com <br /> stantec.com <br /> The content of this email is the confidential property of Stantec and should not be copied,modified, <br /> retransmitted, or used for any purpose except with Stantec's written authorization. If you are not the intended <br /> recipient,please delete all copies and notify us immediately. <br /> r t Please consider the environment before printing this email, <br /> From: Mike Infurna [EH] [mailto:MInfurna@sjcehd.com] <br /> Sent: Wednesday, June 10, 2009 3:49 PM <br /> To: Westhoff, Brian <br /> Subject: RE: Arco 4932, 16 E. Harding Way, Stockton, CA - Monitoring and Sampling Plan <br /> Confirmation <br /> what is your rationale for increasing the sampling in DMW-10? and what <br /> constituents were you planning on analyzing for? <br /> you know this well used to be the lateral plume designator well. it's ND <br /> days are over and have been for a while, but the levels of MtBE, DCA, <br /> and Xylene aren't much of a concern and show only a slight trend. <br /> now as the lost, runaway, ARCO plume appears to have surged mostly <br /> through the CP site, I'm curious why ARCO is now concerned <br /> with knowing twice a year what I was prepared to know only once every <br /> two years? <br /> 6/11/2009 <br />