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U Hygienetics(m) Environmental Hygienetics Environmental Services, Inc. 2433 Mariner Square Loop, #210 Phone:(510) 749-1003 Alameda,CA 94501' Fax: (510) 749-1069 REVISED WORK PLAN ADDITIONAL EXCAVATION AND CONFIRMATION SOIL SAMPLING FORMER UNDERGROUND STORAGE TANK SITE BULK TRANSPORTATION FACILITY 3032 SOUTH EL DORADO STOCKTON, CALIFORNIA 1.0 INTRODUCTION Foss Environmental & Infrastructure (Foss), on-behalf of Bulk Transportation has requested that Hygienetics Environmental Services, Inc. (Hygienetics)prepare this revised work plan proposing additional excavation and soil sampling at the Bulk Transportation Facility in Stockton, California. The purpose of the work will be to remove soil which has been impacted with petroleum hydrocarbons and sample and test in-situ soil after excavation to confirm the affected soil-has been removed. Hygienetics proposes in this work plan to overexcavate soil beneath a former diesel fuel line and diesel dispenser until field observation indicates petroleum-impacted soil has been removed, collect samples at the base of the overexcavated areas, and analyze the samples for pertinent petroleum hydrocarbon compounds. Following are descriptions of the site and of the proposed work. 1.1 Site Location and Description The Bulk Transportation facility is located at 3032 South El Dorado in Stockton, California at the approximate location shown on Plate L. An office building is located at the southwestem comer of the site and a maintenance building is located near the center of the site. The remaining area of the site is paved with asphalt or concrete and is used for driveways or for storage of equipment and vehicles. A 12,000-gallon underground storage tank'(UST), used to store diesel fuel, and associated dispenser facilities were located in the southwestern portion of the site. 1.2 Description of Surface Features Elevation at the site is approximately 13 feet above mean sea level and surface topography in the general area slopes very gently from east to west. Nearby surface waters include Duck Creek which flows westward and northwestward into Walker Slough approximately 1,500 feet south of the site. Homestead Canal flows westward into Walker Slough and at its closest point is within 2,000 feet north and northwest of the site (see Plate 1). The sloughs flow into the San Joaquin River, which flows northward approximately 7,000 feet west of the site.