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C/O <br /> SECOR www secor com <br /> INTERNATIONAL 3017 Kilgore Road Suite 100 <br /> S ECOR INCORPORATED Rancho Cordova CA 95670 <br /> 916 861 0400 TEL <br /> 916-861 0430 FAX <br /> February 27, 2004 <br /> Mr Michael Infurna <br /> San Joaquin County Environmental Health Department <br /> Unit IV—Site Mitigation MAR 0 2 2004 <br /> 304 East Weber Avenue <br /> Stockton, CA 95202 ENVIRONMENT HEALTH <br /> PERMIT/SERVICES <br /> RE Additional Site Assessment Report and <br /> Fate and Transport Model <br /> 7-Eleven Store #14117 <br /> 2725 Country Club Boulevard <br /> Stockton, CA <br /> SECOR Project No 77EL 14117 03 0502 <br /> Dear Mr Infurna <br /> This report was prepared by SECOR International Incorporated (SECOR), on behalf of Mr Ken <br /> Hilliard of 7-Eleven Inc , to document the installation of one groundwater monitoring well (MW-8) and <br /> one soil boring (SB-1) at 7-Eleven store number 14117, located at 2725 Country Club Boulevard In <br /> Stockton, California (Figures 1 and 2) The report was prepared in response to an August 8, 2002, <br /> letter requesting further lateral and vertical plume delineation (Attachment A) <br /> INTRODUCTION <br /> The site is currently operated as a convenience store and retail gasoline fueling facility with three <br /> gasoline underground storage tanks (USTs) as shown on Figure 2 <br /> The scope of work summarized in this report was proposed in The Shaw Group's Work Plan for <br /> Additional Offsite Assessment, Fate and Transport Evaluation Addendum, Sensitive Receptor <br /> Survey, and Fourth Quarter 2002 Monitoring and Sampling, dated January 30, 2003 The SJCEHD <br /> approved the proposed scope of work in a faxed correspondence dated March 21, 2003 (Attachment <br /> A) <br /> The work summarized in this report Includes <br /> 1 Obtaining permits and preparing a health and safety plan <br /> 2 Clearing boring locations using Underground Service Alert (USA) and a private utility locator <br /> 3 Drilling and sampling two hollow-stem auger soil borings <br /> 4 Installing one groundwater monitoring well <br /> 5 Develop and sample the new well <br /> SITE BACKGROUND AND PREVIOUS INVESTIGATIONS <br /> On July 17, 1998, three 10,000-gallon single-walled USTs were removed from the site The UST <br /> excavation was extended to the east, and two new 10,000-gallon double-walled steel USTs were <br /> installed The new tanks were installed In a tank pit located east of the original UST locations One <br /> ten-Inch diameter Schedule 40 PVC conductor casing was installed In the new UST pit between the <br /> new tanks for future Installation of well MW-2 <br /> On September 29 and October 2, 1998, Fluor-Daniel GTI advanced six offsite (OSGP-1 through <br /> OSGP-B) and 11 onsite (GP-7 through GP-17) Geoprobe soil borings (Table 1) The offsite borings <br /> did not contain total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, <br /> and total xylenes (BTEX), or methyl-tent-butyl ether (MtBE) in soil above laboratory reporting limits <br /> File 7 Eleven#224681Reports114117 Vertical Assessment and Fate and Transport Model doc <br />