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1� <br /> Preliminary Investigation and Evaluation Report - June 1997 <br />' Gaurdmo and Crawford <br /> 517 West Fremont Street, Stockton, California <br />' 10. INTRODUCTION <br /> In accordance with the request of Guardino and Crawford, Advanced GeoEnvironmental, Inc , <br /> (AGE) has prepared this Preliminary Investigation and Evaluation Report (PIER) for 517 West <br /> Fremont Street, Stockton, California(the site) The objective of the investigation was to determine <br /> ' the lateral and vertical extent of hydrocarbon-impacted soil and ground water at the site The scope <br /> of work included the advancement of eight soil probe borings,the collection and analysis of soil and <br /> grab ground water samples, and preparation of this report The site and its surroundings are <br /> illustrated on Figure 1 -Location Map Structures,probe boring and soil sample locations are shown <br /> on Figure 2 - Site Plan <br /> ' The work was conducted in accordance with San Joaquin County Public Health Services - <br /> Environmental Health Division (PHS-EHD) and Central Valley Region of the Regional Water <br /> ' Quality Control Board (CV-RWQCB) guidelines for investigation of underground storage tank <br /> (UST) sites <br /> 20 BACKGROUND <br /> ' 21 SITE DESCRIPTION <br /> The site is located on Fremont Street in an area of low topographic relief in west Stockton, south of <br /> ' the site is the Stockton Deep Water Channel Local land use is the vicinity of the site is industrial <br /> and commercial Residential areas are located adjacent to the site <br /> 2 2 UNDERGROUND STORAGE TANK REMOVAL <br /> ' 7 <br /> In September 1989, on1,000- Ilon underground storage tank(UST), dispenser and piping were <br /> removed from the site euro hydrocarbons were detected in soil samples collected from the <br /> ' UST excavation and dispenser areas at concentrations up to 700 parts per million (ppm,reported as <br />' milligrams per kilograms) A letter from the PHS-EHD,dated 07 March 1996, indicated that fiirther <br /> investigation related to the former UST would be required before site closure could be issued <br /> 2 3 GROUND WATER DEPTH AND FLOW DIRECTION <br /> The estimated depth to ground water at the site is approximately 10 to 15 feet below surface grade <br /> (bsg),based on the map titled Lines of Equal Depth of Water Wells, Fall 1993 published by the San <br /> - Advanced GeoEnvironmental,Inc <br />