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Harding Lawson Asa sates June 17, 1988 AUG 12 1988 11"II++IIJJII ENVIROMENTAL HEALTH 4167,218.02 FERMIT/SERVICES Exxon Company, USA P.O. Box 4415 Houston, Texas 77210-4415 Attention: Mr. James M. Kerr, Jr. , P.G. Environmental Geologist Gentlemen: Evaluation of Petroleum Hydrocarbons Regal Station 603 6425 Pacific Avenue Stockton, California This report presents the results of Harding Lawson Associates' (FLA) evaluation of petroleum hydrocarbons at the Regal Station 603 located at 6425 Pacific Avenue, Stockton, California. This evaluation was performed to assess if petroleum hydrocarbons have leaked from the fuel storage and distribution system and impacted soil or ground-water quality. The work was authorized by Exxon Contract No. 88861723. Regal Station Number 603 is located on the northwest corner of the inter- section of Pacific Avenue and Douglas Avenue in Stockton, California. Three 10,000 gallon 27-year old single-wall steel underground tanks are located at the site. SITE INVESTIGATION As part of the investigation HLA was required to drill and sample a mini- mum of two sail borings at the site. The San Joaquin County Health Dis- trict (County) requires well permits prior to the start of work. On May 17, 1988, HLA submitted the required permits, fees, and a description of the anticipated scope of work to the County. On May 26, 1988, FLA contacted Ms. Diane Hinson of the County regarding the status of the per- mits. Ms. Hinson stated that she performed a site visit on May 23, 1988 to inspect the location of the proposed borings. At that time, repair work was being performed to the product and vapor return lines. This work was being performed in response to a failed precession test of the regular gasoline tank. The County had not received any information from Engineers 7655 Redwood Blvd Telephone Arizona Colorado Texas and PO.Box 578 415/892-0821 Alaska Hawaii Telecooy ...... r. n ,Q T-'.. NpvaN. 415/Rq�-0831