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Shell Oil Company <br /> April 19, 1995 (9447-8613) <br /> 1.0 INTRODUCTION <br />' This report documents the results of soil excavation, sampling, and analysis associated <br /> with the removal of four underground gasoline storage tanks (USTs) on December 7, 1994 at the <br /> Shell Oil Products Company (Shell) service station (WIC 4204-7524-2804) located at 4315 <br /> Waterloo Road, Stockton, California (Figure l) The removal of these four USTs is part of a <br /> station upgrade, which included installing a double-walled fiberglass containment system in the <br />' same location as the previous USTs This report is based, In part, on information supplied to <br /> Fugro by Shell, and is subject to modification as newly acquired information may warrant <br />' 1.1 Purpose <br /> The purpose of the investigation was to <br />' characterize the site's shallow subsurface exposed during the removal of the USTs <br /> and associated piping, <br />' perform regulatory-required UST closure sampling, along with additional over <br /> excavation and sampling, if warranted, and <br /> • characterize excavated soil temporarily stockpiled on-site, and dispose of <br /> accordingly <br />' <br /> 1.2 Scope <br />' The completed scope of work, summarized below, was performed in accordance with <br /> Fugro's standard operating procedures (SOPS) included in Appendix A <br /> • On December 7, 1994,Fugro personnel observed the removal of four single-walled <br /> steel USTs (8,000, 7,000, and two 5,000-gallon) and associated product piping <br /> from the site (Figure 2) All of the USTs were in good condition with no apparent <br /> holes except tank T5000A, which had a small hole in the seam near the top of its <br /> eastern end <br /> • On December 7, 1994, Fugro personnel collected ten soil samples from beneath <br /> the former UST locations, as witnessed and directed by a San Joaquin County <br /> Department of Environmental Health (SJCDEH) representative The soil samples <br /> were collected at depths ranging from 15 to 19 feet below ground surface (bgs) <br /> The maximum depth of the excavation was approximately 19 feet bgs <br />' On December 7, 1994, Fugro personnel collected eight soil samples from beneath <br /> removed product piping (Figure 2) The soil samples were collected <br /> approximately 2 feet below the removed piping <br /> 94478613 ACR i <br />