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Page 1 01 <br /> itantec <br /> ` Mike Infurna[EH] <br /> . I <br /> From: Mike Infurna [EH] <br /> Sent: Thursday, December 03, 2009 3:39 PM <br /> To: 'Chevlen, Benjamin'- <br /> Subject: <br /> enjamin'-Subject: RE: 76 Station No. 5886 - Contact information for offsite property owner <br /> good job... <br /> is your "understanding" regarding the denied access still an assumption or can it be <br /> verified? <br /> From: Chevlen, Benjamin[mailto:Benjamin.Chevlen@stantec.com] <br /> Sent: Thursday, December 03, 2009 3:27 PM <br /> To: Mike Infurna [EH] <br /> Subject: RE: 76 Station No. 5886 - Contact information for offsite property owner <br /> Hi Mike - I was already in the process of sending you an email. Let me get the information for the items <br /> outlined below from the ConocoPhillips group responsible for obtaining access agreements. I should have <br /> it all by tomorrow.. . <br /> q.. <br /> Stantec is currently in the process of performing fate transport modeling of the site's MTBE plume. A <br /> cursory glance at historical MTBE concentrations in groundwater suggest the MTBE plume may not be <br /> stable..The shallow depth to water (6 to 10 feet bgs) makes understanding the nature and extent of the <br /> remaining dissolved-phase contamination important. As is documented in a sensitive receptor survey for <br /> the site, prepared by Stantec, and issued earlier,today, an irrigation well installed in 1992, and screened <br /> from 102-142 feet bgs; is located approximately 1,300 feet west of the site (cross- to down-gradient). <br /> Onsite -the operation of an ozone system appears to have effectively remediated the site. The ozone <br /> system was shut down in August 2009, Stantec will be monitoring for rebound in onsite contaminant <br /> concentrations. <br /> Assuming onsite hydrocarbon concentrations don't rebound, and the results of proposed batch extractions <br /> and/or fate transport modeling and (if needed)additional groundwater samples collected from the area of <br /> proposed well cluster MW-11 are favorable, then the site should be qualified for NFA. <br /> Benjamin Chevlen,P.G. - - <br /> Senior Geologist <br /> Stantec <br /> Ph: (916)384-0745 <br /> Fx: (916)861-0430 <br /> Cell: (916)425-4849 - <br /> benjamin.chevien@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 <br /> used for any purpose except with Stantec's written authorization. If you are not the intended recipient,please delete all <br /> copies and notify us immediately. _ <br /> Please consider the environment before printing this email. <br /> 4 <br /> From: Mike Infurna [EH] [mailto:MInfurna@sjcehd.com] <br /> Sent: Thursday, December 03, 2009 3:07 PM <br /> 1/27/2010 <br />