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SITE CHARACTERIZATION REPORT - -FIRE STATION NO. 12 4010 EAST MAIN STREET STOCKTON, CALIFORNIA L.t 1.0 INTRODUCTION This site `characterization was performed to assess the horizontal and vertical extent of petroleum product constituent(PPC) migration in soil at the City of Stockton, Fire Station No. 12 facility in.Stockton, California. The presumed source of the PPCs was an apparent release petroleum fuel from underground storage tanks.(USTs) which were removed from the site in September 1994. This work was authorized by Mr. John Fukumoto, Senior Civil Engineer, City of Stockton Department of Public Works, Solid Waste Division, in a contract (PO# 069242) dated March 6, 1995. Mr. Fukumoto may be contacted at the City of Stockton, Department of Public Works, 425 North El Dorado Street, Stockton, California 95202, telephone number (209) 937-8829. r The work was performed by the Environmental Services, Drilling Services, and Laboratory �•+ Divisions of The Twining Laboratories, Inc. (Twining), located in Fresno, California. I 2.0 BACKGROUND The following subsections describe the site, the geologic and hydrologic characteristics, and the project history. i 2.1 Site Description: The site is located at 4010-East Main Street on the southeastern corner of East Main Street and Hinkley Avenue. The site elevation is approximately 30 feet. above mean sea level. Drawing 1 is a site location map. The City of Stockton, Fire Station No. 12 facility consists of a single story, frame on slab, fire house. The remaining portions of the site consist of landscaped areas and paved f parking areas. The former USTs and fuel dispensers were located approximately 33 feet south of the firehouse in one tank pit. The site is bound on the north by East Main Street, on the east by residences, south by paved parking and residential areas, and on the west by Hinkley Avenue. Drawing 2 is a site plan depicting site features. I