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SECOR www secor com <br /> INTERNATIONAL 3017 Kilgore Road Suite 100 <br /> S E C ® R INCORPORATED Rancho Cordova CA 95670 <br /> 916-861-0400 TEl- <br /> 916-861-0430 FAX <br /> December 29, 2005 <br /> Ms Lori Duncan <br /> San Joaquin County <br /> Environmental Health Department MECERW <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> ENVIROJyNI ANT HEALTH <br /> Re Extended Groundwater Pumping Test& PERMTSCRVICES <br /> Oxygen Infection Feasibility Study -Addendum <br /> 7-Eleven Store# 32262 <br /> 2360 West Grant Line Road <br /> Tracy, California <br /> SECOR Project No 77EL 32262 05 0515 <br /> Dear Ms Duncan <br /> This addendum was prepared by SECOR International Incorporated (SECOR), on behalf of 7- <br /> Eleven Inc , to submit SECOR's proposal for future work at 7-Eleven store number 32262, <br /> located at 2560 West Grant Line Road in Tracy, California (Figures 1 and 2) This addendum <br /> was prepared in response to the San Joaquin County Environmental Health Department <br /> (SJCEHD) letter dated December 7, 2005 (Attachment A) <br /> The purpose of the Extended Groundwater Pumping and Oxygen Infection Feasibility Study <br /> submitted by SECOR on November 15, 2005, was to provide confirmation to the results of the <br /> original groundwater pump test and oxygen infection test reported in the Assessment and <br /> Feasibility Report and SCM, submitted to the SJCEHD on September 30, 2004 <br /> In the November 15, 2005 report, SECOR confirmed the following <br /> • Groundwater extraction from extraction well EX-1 does not produce measurable <br /> drawdown of the groundwater table at the site <br /> • Infection of oxygen Into the subsurface at the site does not appear to be a feasible <br /> remedial alternative due to a determined radius of Influence (ROI) for oxygen <br /> infection of less than 5 feet <br /> Dissolved MtBE Plume Stability <br /> Review of dissolved methyl-tert-butyl-ether (MtBE) concentration trends at the site (Table 1), <br /> document that the dissolved MtBE concentrations are declining Figures 3 through 6 present <br /> r <br /> I <br />