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{ A soil sample collected by TreaTek,Inc. from beneath the southern end of the northernmost underground storage tank contained the maximum concentrations of petroleum hydrocarbons, where TPH as gasoline was reported at 785 mg/kg, benzene at 0.445 mg/kg, toluene at 1 030 mg/kg, ethylbenzene at 3.770 mg/kg, and xylenes at 4.580 mg/kg. TPH as diesel was reported from only one soil sample, a composite soil sample collected from a soil stockpile, at a concentration of 367 mg/kg. 1.3 Purpose The scope of work performed was designed to define the vertical and horizontal extent of soil contamination previously detected at the site, to determine whether groundwater had been impacted, and to collect information required to determine whether remedial actions may be required. The work was performed following the preliminary site assessment guidelines presented in the State Water Resources Control Board (now CAL-EPA)"Leaking Underground Fuel Tank (LUPI') Field Manual" and the Regional Water Quality Control Board "Regional Board Staff Recommendations for Initial Evaluation and Investigation of Underground Tanks". 2.0 AGENCY RECORD REVIEW OF NEIGHBORING SITES Agency records related to underground tanks (i.e. tank removal, installation, or testing), hazardous materials use or storage, hazardous materials spills, and remedial investigations or clean-up activities were researched for the subject property and selected neighboring sites The nearby sites which were researched were selected based on existence of underground fuel storage tanks and proximity to the subject site. The nearby sites selected for review included the former Exxon Service Station located at 4444 North Pershing Avenue, approximately 200 feet east of the subject property, the Shell Service Station located at 4445 North Pershing Avenue, approximately 150 feet southeast of the subject property, the 7-11 located at 4501 North Pershing Avenue, approximately 100 feet east of the subject property, and the car wash located approximately 75 feet south of the subject property 2.1 Agency Records McLaren/Hart personnel contacted the PHS/EHD for information on potential environmental impacts of nearby sites to the subject property. Mr. Michael Collins of the PHS/EHD stated that no file exists for the car wash located south of the subject property, and provided information on environmental investigations conducted at the subject property and other nearby sites. 2.11 Exxon Service Station The underground storage tanks were removed from the former Exxon Service Station on July 22, 1986, and following review of the tank removal soil sampling analytical results, i itis1cai 3