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Former Service Station Site Assessment 548 (Currently 678) North Wilson Way,Stockton, California 1.0. INTRODUCTION During the course of performing a Phase I site assessment of a property at 678 North Wilson Way the former presence of a service station was documented on a portion of the property that formerly had the address of 548 North Wilson Way: The former service station was identified on aerial photographs from 1937 and 1952, was listed in telephone directories from circa 1926 to 1952, and ' was identified on Sanborn Fire Insurance Maps for 1950. To complete the Phase I site assessment, a limited assessment of the property was conducted for hydrocarbon impacted soil potentially related to the former underground storage tanks (USTs) assumed to have been utilized on the property for,the service station. The location of the site.is illustrated in Figure l -Location Map. A plan of the site is depicted in Figure 2 -Site Plan. 2.0. . PROCEDURES Four exploratory borings were advanced at the former 548 N. Wilson Way site to assess soil for potential hydrocarbon impact associated with the former service station operation located on the site.* It has been AGE's experience that the"oil&gas"designation on the Sanborn Fire Insurance Maps indicate the former location of the USTs. This was the main area explored on.the site. Prior to conducting the field work, a work plan and a site-specific health and safety plan were prepared by AGE and submitted to the San Joaquin County Public Health Services-Environmental Health Department(PHS-EHD) for approval,which was granted. AGE also procured the permits required to advance the boreholes. In addition, on 29 January 1998, AGE probed the site to depths of 2.5 to 3 feet below surface grade (bsg) on a five-foot grid:pattern with a rod to check for the presence of underground storage tanks (USTs). No USTs were encountered. The field work was conducted.on 05 February 1998.The four soil probe borings (probings) were advanced utilizing a Geoprobe 5400 direct push soil sampling rnachine.-Soil samples were collected at 5-foot intervals from 5 feet bsg to 25 feet bsg. Discrete soil samples were collected in each probe boring using a 1.375-inch diameter,two-foot long,piston type sampler loaded with four pre-cleaned 6-inch brass sleeves. The sampling equipment was washed in an Alconox solution and rinsed with water prior to each sampling run to avoid cross-contamination. Upon sample retrieval,both ends of the second brass sleeve were covered with Teflon sheets,capped and sealed with tape. Samples were labeled and then placed in a chilled container and transported under chain-of-custody to McCampbell Analytical, Inc. (MAI) in Pacheco, California. The laboratory report, QA/QC report and chain-of-custody are included as Appendix A. Advanced CeoEnvironmental,Inc.