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tr <br /> . Quarterly Report - First Quarter 2000 <br /> Gaurdino and Crawford <br /> 517 West Fremont Street, Stockton, California <br /> ' 10 INTRODUCTION <br /> At the request of Guardino and Crawford Construction,Advanced GeoEnvironmental, Inc , (AGE) <br /> has prepared this quarterly report for 517 West Fremont Street, Stockton, California (the site) The <br /> site and its surroundings are illustrated on Figure I Structures, boring and monitoring well locations <br /> ' are shown on Figure 2 <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 The scope of work was conducted in accordance with Work Plan Addendum for <br /> monitoring well installation prepared by AGE, dated 07 May 1998 <br />' 2 0. BACKGROUND AND SITE DESCRIPTION <br /> The site is located on Fremont Street in an area of low topographic relief in west Stockton and is <br /> north of Stockton Deep Water Channel Local land use in the vicinity of the site is industrial and <br /> commercial Residential areas are located adjacent to the site <br />' <br /> 21 UNDERGROUND STORAGE TANK REMOVAL <br /> In September 1989, one 1,000-gallon underground storage tank (UST), dispenser and piping were <br /> removed from the site Petroleum hydrocarbons were detected in soil samples collected from the <br />' UST Excavation and dispenser areas at concentrations up to 700 milligrams per kilograms (mg/kg) <br /> The PHS-EHD issued a letter dated 07 March 1996 that required additional investigation of the <br />' former UST before site closure could be considered <br />' 22 PREVIOUS INVESTIGATION <br /> A total of eight soil probe borings (P1 through P8) have been advanced at the site since September <br />' 1995 (Figure 2) Ground water at the site was encountered at a depth of approximately 25 feet below <br /> surface grade (bsg) in September 1995 and ata depth of 15 feet bsg in April 1997 <br />' A probe bonng advanced near the former dispenser island location encountered significantly <br /> . hydrocarbon-impacted soil Additionally, the ground water in the area of the former dispenser island <br /> was impacted by petroleum hydrocarbons <br />