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Hygienetics(m) <br /> Environmental <br /> Hygienetics Environmental Services, Inc. 2433 Mariner Square Loop,#210 Phone: (510) 749-1003 <br /> Alameda,CA 94501 fax: (510) 749-1069 <br /> C� <br /> REPORT <br /> ADDITIONAL EXCAVATION <br /> AND <br /> CONFIRMATION SOIL SAMPLING <br /> FORMER UNDERGROUND STORAGE TANK SITE <br /> BULK TRANSPORTATION FACILITY <br /> 3032 SOUTH EL DORADO STREET ; <br /> STOCKTON, CALIFORNIA <br /> 1.0 INTRODUCTION <br /> Foss Environmental & Infrastructure (Foss) and Hygienetics Environmental Services Inc. <br /> Yg , <br /> (Hygienetics)performed excavation and sampling of soil in the area of former diesel underground <br /> storage tank (UST) fuel lines and dispenser facilities at the Bulk Transportation facility in <br /> Stockton, California. The work was performed to remove soil that was impacted with petroleum <br /> hydrocarbons and sample and test in-situ soil after excavation to confirm the affected soil had <br /> been removed. <br /> 1.1 Site Location and Description <br /> The Bulk Transportation facility is located at 3032 South El Dorado Street in Stockton, California <br /> at the approximate location shown on Plate 1. An office building is located at the southwestern <br /> • corner of the site and a maintenance building is located near the center of the site. The remaining <br /> area of the site is paved with asphalt or concrete and is used for driveways or for storage of <br /> equipment and vehicles. <br /> A 12,000-gallon underground storage tank (UST) and associated pipeline and dispenser facilities <br /> were installed in the southwestern portion of the site in 1988. The UST was used to store diesel <br /> fuel. Fueling facilities included two satellite fuel dispensers, which were located on islands to the <br /> �I east of the UST. A central island between the two satellite dispensers contained control facilities <br /> that directed fuel to the dispensers. In this report, these facilities are referred to as the northern <br /> and southern satellite dispensers and the central control dispenser. <br /> 1.2 Physical Setting <br /> 1.2.1 Surrounding Surface Features <br /> The ground-surface elevation at the site is approximately 13 feet above mean sea level and <br /> surface topography in the general area slopes very gently from east to west. Nearby surface <br /> waters include Duck Creek which flows westward and northwestward into Walker Slough <br /> approximately 1,500 feet south of the site. Homestead Canal flows westward into Walker Slough <br /> and at its closest point is within 2,000 feet north and northwest of the site (see Plate 1). Walker <br /> i <br />