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TEG Northern California Inc. <br /> 9 August 2011 <br /> Tony Giglini <br /> Stantec Consulting <br /> 3017 Kilgore Road, Suite 100 <br /> Rancho Cordova, CA 95670 <br /> SUBJECT: DATA REPORT - Stantec Consulting #211602258.400.400 <br /> 666 West Weber Avenue, Stockton, California <br /> TEG Project# 10721 F <br /> Mr. Giglini: <br /> Please find enclosed a data report for the samples analyzed from the above referenced project for Stantec <br /> Consulting. The samples were analyzed on site in TEG's mobile laboratory. TEG conducted a total of 30 <br /> analyses on 15 soil vapor samples. <br /> 15 analyses on soil vapors for BTEX, naphthalene, 5 oxygenates and TPH by EPA method 82606. <br /> 15 analyses on soil vapors for methane by GC/TCD. <br /> The results of the analyses are summarized in the enclosed tables. Applicable detection limits and QA/QC <br /> data are included in the tables. <br /> 1,1 difluoroethane was used as a leak check compound during the soil vapor sampling. No <br /> 1,1 difluoroethane was detected in any of the vapor samples reported at or above the DTSC recommended <br /> leak check compound reporting limit of 10 µg/L of vapor. <br /> TEG appreciates the opportunity to have provided analytical services to Stantec Consulting on this project. <br /> If you have any further questions relating to these data or report, please do not hesitate to contact us. <br /> Sincerely, <br /> Mark Jerpbak II'! <br /> Director, TEG-Northern California r 2011 I' <br /> IS <br /> 11350 Monier Park Plane. Rancho Cordova, CA 95742 Phone [915] 853-8010 Fax [9151 853-8020 <br />