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SECOR _ WWW SCCorCom _ - <br /> INTERNATIONAL 3017 Kilgore Road,Suite 100 <br /> INCORPORATED Rancho Cordova CA 95670 <br /> ti <br /> 916-8$1-0400 TEL <br /> 916-861-0430 FAX <br /> May 18, 2005 <br /> Mr Harlin Knoll <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> RE Offsite Assessment Report <br /> 7-Eleven Store#20632 <br /> 4627 Da Vinci Drive <br /> Stockton, California <br /> SECOR Project No 77EL 20632 05 0502 <br /> Dear Mr Knoll <br /> This report was prepared by SECOR International incorporated (SECOR), on behalf of 7- <br /> Eleven, Inc , to document advancement of eight soil borings (SB-1B, SB-1C, SB-2A, SB-2B, <br /> SB-2C, SB-3A, SB-3B and SB-3C) south and southeast of 7-Eleven store number 24340, <br /> located at 4627 Da Vinci Drive in Stockton, California (Figures 1 and 2) The work was <br /> performed in accordance with SECOR's June 18, 2004 Offsite Assessment Work Plan and the <br /> July 6, 2004 approval letter from the San Joaquin County Environmental Health Department <br /> (SJCEHD) (Attachment A) <br /> INTRODUCTION <br /> The site is currently an operating 7-Eleven convenience store and gasoline station with two <br /> 10,000-gallon underground storage tanks (USTs) (Figure 2) <br /> The work summarized in this report is as follows <br /> 1 Obtaining permits from <br /> ■ SJCEHD for well construction <br /> ■ East Bay Municipal Utility District for access to Mokelumne Aqueduct <br /> right-of-way <br /> 2 Preparation of a health and safety plan <br /> 2 Clearing eight boring locations using Underground Service Alert (USA) and a private <br /> utility locator <br /> 3 Advancement and sampling of eight soil borings <br /> 4 Submitting soil and groundwater samples for laboratory analysis <br /> SITE BACKGROUND AND PREVIOUS INVESTIGATIONS <br /> Initial site assessment activities were executed in accordance with directives from SJCEHD <br /> (Fluor Daniel GTI 1997) On February 21, 1997, Flour Daniel GTI supervised the advancement <br /> of six angled and four vertical geoprobe borings (GP-1 through GP-10) at the site (Figure 3 and <br /> Table 1) Soil samples were collected from the borings at vertical depths of 5 to 15 feet below <br /> ground surface (bgs) The six angled borings (GP-1 through GP-6) were advanced beneath the <br /> t 17-Elevenl7-11 Stores1206321Reportsr20632 Assessment Report 05-8-05 doc <br />