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Page 4 of 14 <br /> to HA-3 were utilized in calculating the remaining soil mass); Stantec reviewed <br /> historical site use to determine where shallow soil impact would be most likely <br /> (around the dispensers and product piping lines) and utilized the entire area as the <br /> lateral extent of impacted soil. <br /> get me emails, letters, reports, ? whatever to address these. <br /> thanks <br /> mike <br /> From: Chevlen, Benjamin [mailto:Benjamin.Chevlen@stantec.com] <br /> Sent: Friday, January 14, 20119:29 AM <br /> To: Mike Infurna [EH] <br /> Subject: RE: 76 #5886 <br /> Since the AS wells were utilized as ozone injection points, groundwater samples were never <br /> collected from them. The most illustrative examples of the effectiveness of the ozone <br /> injection are the before and after MTBE concentrations in wells MW-2 and MW-3 (adjacent to <br /> AS-91D and AS-61D, respectively). Samples collected prior to start-up of the OS system had <br /> MTBE concentrations ranging from thousands to tens of thousands, while dropping to less <br /> than 100 ug/L in less than 2 years, with continued decreases after that. Groundwater data in <br /> these.wells show how heavily impacted the site was, and the effectiveness of the OS system <br /> in remediating the on-site impact. <br /> Benjamin Chevlen,P.G. - <br /> Senior Geologist - <br /> Stantec <br /> Ph: (805)230-1266 Ext. 293 <br /> Fx: (805)230-1277 <br /> Cell: (916)425-4849 <br /> benjamin.chevlen@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 <br /> intended recipient, please delete all copies and notify us immediately. <br /> Please consider the environment before printing this email. <br /> From: Mike Infurna [EH] [mailto:MInfurna@sjcehd.com] <br /> Sent: Friday, January 14, 20118:14 AM <br /> To: Chevlen, Benjamin <br /> Subject: RE: 76 #5886 <br /> very helpfull..l'm now PAST soil concerns.. <br /> gw is the new concern. <br /> I can't find any gw lab data for the AS wells. ever done? <br /> I've got to present the 'before' and 'after' data. only before gw hits were in <br /> GP-17. AS-5 appears to be in the same area it could represent the after <br /> data. <br /> 3/14/2011 <br />