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n ] <br /> R <br /> • Quarterly Report - June 1999 <br /> Gaurdmo and Crawford <br /> 517 West Fremont Street, Stockton, California <br /> 1.0 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 1 Structures,bonng and monitoring well locations <br /> k are shown on Figure 2 <br /> r <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 Additionally the scope of work was conducted in accordance with Work Plan Addendum <br /> for 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, 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 1 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 indicated by letter dated 07 March 1996, that additional investigation related to the <br /> former UST would be required before site closure could be issued <br /> 22 PREVIOUS INVESTIGATION <br /> A total of eight soil probe borings (P 1 through P8) have been advanced at the site since September <br /> 1995 -Ground water at the site was encountered at a depth of approximately 25 feet below surface <br /> grade (bsg) in September 1995 and at a depth of 15 feet bsg in April 1997 <br /> Probe boring 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 /> Adrahced GeAm ironmental,Inc <br />