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Historical Background & Site Conceptual Model FIRE STATION 42 ' 110 West Sonora Street, Stockton, California ' 1.0. INTRODUCTION The historical background for the unauthorized release of hydrocarbons from the common underground storage tank(UST) area at the north end of the property located at 110 West Sonora Street, Stockton, California is the following ' 2.0. BACKGROUND ' The site is bounded on the north by Sonora Street, on the west and south by Madison Street and on the east by Commerce Street Presently a single building is located at the northern portion of the site, ' occupied by the City of Stockton- Fire Prevention Department The properties surrounding the site are mostly industrial, including the Pacific Gas and Electrical bio-remediation project of the former coal gasification plant,directly down-gradient east of the site,with a few residences northeast of the site 2 1 UNDERGROUND STORAGE TANK REMOVALS UST installation dates are uncertain, however, the UST likely serviced the training and fire house site since the 1960's when the facility was constructed The locations of the USTs and tank designations,as reported by the EHD are depicted on Figure 2 Observe these differ from depictions of the site UST layout in prior reports ' In April 1987,UST 41,a 1,000 allon gasoline UST was removed from the northern end of the UST g cluster located at the western edge of the site The UST removal documented an unauthorized release This UST reportedly served the western dispenser on the fuel island, located at the southwestern corner of the building The product line which was served fuel from UST #1 was reportedly abandoned The soil sample collected during the UST removal reportedly contained total petroleum hydrocarbons(TPH)at 3,300 milligrams per kilogram(mg/kg),and benzene,toluene and xylenes at 54 mg/kg, 280 mg/kg and 380 mg/kg, respectively In August 1987,one additional UST46 was removed from the southern portion of the trained tower, referred to later as the southern UST In April 1992 UST#4 was removed from the western corner of the building, this UST stored waste oil and was filled by drain lines from within the building's repair pit located at the western edge of the building I In October 1992 UST#2, UST#3 and UST#5 were removed from the site, along with the dispenser lines which served the site's dispenser located at the southwestern corner of the building UST#5 was ' a 500 gallon UST used for the storage of diesel fuel UST#2 was a 1,000 gallon gasoline UST and Advanced GeoEnvironmental,Inc I