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3.1.1 Preliminary Site Inspection IT performed a preliminary site inspection in March, 1997, to gather the information necessary to ' carry out the field work and to prepare the site background section of the Preliminary Investigation Evaluation Report The execution of this task included the following • Contacting facility personnel to coordinate an on-site inspection and interview, • Visiting the site to review on-site records, determine work constraints, sketch ' scaled site plan, and mark drilling locations, ' • Meeting with regulatory agencies to review the project file 3.1.2 Health and Safety Plan Prior to initiating field work, a site specific health and safety plan was prepared for site activities in accordance with 29 CFR 1910 120 The health and safety plan provided a summary of physical and chemical hazards at the site, names and telephone numbers of responsible individuals working on the project, and emergency instructions and directions to receive medical attention ' 3.1.3 Permits and Utility Clearances To perform the scope of work, a monitoring well permit was obtained from the San Joaquin ' County PHS/EHD and is presented m Appendix A of this report All Geoprobe borings were located within the property boundary and off of any public road nght-of-way Therefore, neither offsite access agreements nor encroachment permits were necessary On July 10, 1997 all drilling locations were cleared in response to IT' request to Underground ' Service Alert (USA) to perform a routine utility clearance inspection Utilities including COMTECH, MCI and PG&E notified IT that drilling locations were clear of underground utility lines ' 3.2 Soil Investigation IT conducted a subsurface investigation to define the vertical extent of TPH-as diesel impacted soil Soil samples were collected using a Geoprobe Direct Penetration Technology (DPT) ng ' SAC108-29-97/ENG/771744 4 1