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2.1 SITE DESCRIPTION The site,which is identified by PHS/EHD as"Site Code 1237," is located in the southeast portion of the Port of Stockton complex, about 350 feet-north of Port Road N, and about 250 feet east of C � f' Port Road 21 (Figure 1). The site is situated between twonortheast-trending railroad spur tracks, and adjacen#to a metal-sided office (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 k inspection reports,two of the tanks(No.'s 1 and 2)contained regular gasoline,while the remaining �h two tanks contained unleaded gasoline. Product pipelines ran west from the tanks for approximately 140 feet, then turned south and ran''approximately 50 feetg',along the west side of the building to a dispenser island (Figure 2). The tanks were removed on May 11, 1989 by Thorpe,0il,:Inc. (Thorpe), under permit from. PHS/EHD. The PHS/EHD inspection reports indicated that the tanks were constructed of steel and were in' condition, with no visible holes, Approximately 50 yards of soil were excavated with the tanks to a depth of about 1 i 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 ben eath each end and in the middle of each tank) ai 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#I 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 p o total petroleum hydrocarbons as gasoline,.TPHg) and benzene, toluene, ethyl benzene,and total xylenes(BTEX)by EPA Method 801518020;ethylene dibromide(EDB)by EPA Method 504, and organic lead by the Department.of Health Services LUFT method. In addition l= 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 1985 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 petroleum hydrocarbon compounds (PHCs) detected beneath the'four tanks. No benzene was detected in ary of the soil samples, and most PHCs d1C5a&nVrPt 2 PHILIP P.'ROSS, R.G.