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t r INTRODUCTION The preparer of this report first visited the site o-n March 14, 1990, at which time the tanks had been excavated and moved, the fuel transfer lines uncovered and the dispensing pumps removed, the bases torn out and all required sampling and testing for contaminants done. Inasmuch as some of the sarrnles were contaminated, operations were shut down until such time as this report could be prepared; which assesses work done and proposes new work that will enable a complete contamination assessment to be made . Data presented herein is intended to fulfill the requir- ments of both the DHS Preliminary Report Format and the Tri- Regional soil Contamination Work Plan. A Soil Remediation Proposal is not included. HISTORY OF SITE ACTIVITY The site was leased to Pete Smith, Jobber Shell Products, on January 6, 1975 (Attachmen`'. # 1) , and tanks, loading racks, transfer lines and dispensing pumps were installed shortly thereafter. .The exact dates of construction were not available to the writer. Four underground tanks were installed; three, 12,007 gal . , regular fuel tanks with piping and metered dispenser (Attachment 2) , and one 5,000 gallon tank with the same connections (as was subsequencly revealed when excavating) . The initial inspection of the then abandoned site, as of March 7, 1988, stated that other tanks might be located on site. This did not prove to be the case. Permanent-, closure of these tanks was demanded by the San Joaquin Local Health Distrl.:t (now the DHS) ; if they were not to be closed, then they had to be tested and brought up to standards for operation of underground storage tanks. After consideration of alternatives, the Port of Stock-ton retained Jim Thorpe Oil, Inc:. to remove the tanks and take appropriate actions for site inspection and closure. On May 5, 1969, the Local Health District approved the Jin Thorpe Oil Co. plan (dated April 20, 1989) for tank re- moval and excavation and testing of the site for possible contamination (Attachment 3) . A site diagram is given in this application; the tanks to be removed are numbered 364 , 365, 366 and 367. A lO,000 gallon, above-ground diesel tank iE also shown. The testing protocol of San Joaquin County was specified; that is, 3 samples were to be taker, under each tank of 10,000 gals. plus size and one per 20 lineal ft. of pipeline. Tests for TPH-G, GCFID 5030 prep. ,and BTXE (6020) were specified for all samples; also DHS method TEL and EDB tests were specified for two of the tanks that hat'. contained leaded aasaline. 2 ;