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2.1 SITE DESCRIPTION The site,which is identified by PHS/EHD as"Site Code p' Road N,and about 250 feet east of d in the southeast portion of the Port of Stockton complex. about 350 feet north ofort Port Road 21 (Figure 1). The site is situated between two northeast-trending railroad spur tracks, and adjacent to a metal-sided office building (Figure 2). Four 12,000 gallon USTs (PHS/EHD ID # 39-1237-01 through -04) were installed beneath the site in 1975. According to the PHS/EHD r inspection reports,two of the tanks(No.'s 1 and 2) contained regular gasoline, while the remaining two tanks contained unleaded gasoline. Product pipelines ran west from the tanks for approximately 140 feet, then turned south and ran approximately 50 feet along the west side of the building to a dispenser island(Figure 2). The tanks were removed on May 11, 1989 by Thorpe Oil, Inc. (Thorpe), under permit from PHS/EHD The PHS/EHD inspection reports indicated that the tanks were constructed of steel and were in"good" condition, with no visible holes. Approximately 50 yards of soil were excavated with the tanks to a depth of about 11 feet below ground surface(bgs). The product pipelines were removed by Thorpe on July 10, 1989, The PHS/EHD inspection report indicated that the piping condition was"good" although the pipes were described as"rusted." 2,2 SUMMARY OF PREVIOUS SITE CHARACTERIZATION WORK 2.2.1 Tank and Pipeline Removal Soil samples were collected by Canonie Environmental from twelve locations beneath the tanks(3 samples per tank collected from beneath each end and in the middle of each tank) at depths of 14 feet bgs. No groundwater was encountered during excavation or sampling. Soils beneath the tanks were reported by PHS/EHD to be "clay loam" or "sandy clay loam." Slight petroleum product odors were reported from samples collected along the east side of Tanks#1 and #2, and from each of the samples collected beneath Tank #4. Soil samples collected from beneath the tanks were submitted to Canonie Environmental for analysis of total volatile petroleum hydrocarbons (equivalent to total petroleum hydrocarbons as gasoline, TPHg) and benzene, toluene, ethyl benzene, and total xylenes(BTE3)by EPA Method 8015/8020; ethylene dibromide(EDB)by EPA Method 504, and organic lead by the Department of Health Services LUFT method. In addition to being analyzed for these constituents samples from beneath the pipeline and dispenser were analyzed for total extractable hydrocarbons (equivalent to total petroleum hydrocarbons as diesel, TPHd) by methods described in the 1 9'?5 edition of"Guidelines for Addressing Fuel Leaks" prepared by the California Regional Water Quality Control Board, San Francisco Region. Analytical results indicated low levels of PHCs detected beneath the four tanks. No benzene was 2 PHILIP P. ROSS, R.G.