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Quarterly Report <br /> Former Stephens Marine Property <br /> 345 Yosemite Street, Stockton, California <br /> ' I;4. INTRODUCTION <br /> In accordance with the request of Union Safe Deposit Bank, Advanced GeoEnvironmental, Inc <br /> ' (AGE) has prepared the enclosed Quarterly Report for 345 Yosemite Street, Stockton, California <br /> The scope of work included advancement of ten soil probe borings, installation of six ground water <br /> monitoring wells, and conducting a ground water sampling event The objective of the investigation <br /> was to determine the lateral and vertical extent of hydrocarbon-impacted soil and ground water at <br /> the site The site and its surroundings are illustrated on Figure 1 -Location Map Structures, probe <br /> boring and soil sample locations are shown on Figure 2 -Site Plan <br /> ' The investigation 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 /> 1 4 <br /> 2.0. BACKGROUND <br /> 21 SITE LOCATION AND DESCRIPTION <br /> ' The site is located in central Stockton, California(Figure 1) Two main compounds of structures are <br /> located on the property(Figure 2) Most of the site was used as a ship building facility from the early <br /> 1910's through the mid 1980 s A plating shop has occupied a building in the northern portion of <br /> the site(Building I)since the early 1950's The remaining portions are curl eptly occupied by an auto <br /> repair shop, a tile showroom, a sheet metal shop and a boat storage facility <br /> 22 UNDERGROUND STORAGE TANK REMOVALS <br /> 2 2 1 EAST UST AREA <br /> One 4,000-gallon gasoline UST was removed from the City of Stockton right-of-way (Lindsay <br /> ' Street)in November 1997 Total petroleum hydrocarbons quantified as gasoline(TPH-g)and volatile <br /> aromatics (benzene, toluene, ethylbenzene and xylenes BTE&X) were detected at concentrations <br /> ' as high as 690 parts per million (ppm, reported as milligrams per kilogram) in one soil sample <br /> collected from the UST excavation Stockpiled soil contained TPH-g at 1,300 ppm Benzene was <br /> not detected in the soil samples collected during the UST removal Water was noted in the <br /> ' excavation,however a water sample was not collected from the UST excavation <br /> • <br />