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4 Evaluate all results and recommend any further action at the site that may be <br /> warranted <br /> 5 Coordinate all field work with Pacific Bell as well as local and regional <br /> regulatory agencies <br /> To accomplish these goals, IT drilled two soil borings (Figure 3) The soil boring locations <br /> were identified to examine the distribution of petroleum hydrocarbons near the west end of <br /> the former middle diesel tank location To facilitate future observation of vadose zone soil <br /> conditions, observation wells were installed in each open borehole <br />' Where applicable, field investigation methods will follow the Tri-Regional Board Staff <br /> Recommendations for Preliminary Evaluation and Investigations of Underground Storage <br /> Tank Sites, 10 August 1990 The following section describes the procedures that will be <br />' used in completing the investigation <br /> 2.1 Drilling Methodology <br /> IT notified Underground Services Alert (USA) at two working days before starting any <br /> drilling activities This, in addition to studying utility maps and the contracting of an <br /> independent line locating service, helped insure that drilling activities did not encounter any <br /> underground utilities <br /> A concrete saw was used to core 12" diameter holes in the sidewalk to facilitate access to the <br />' subsurface Boreholes were initially advanced using a decontaminated hand auger to <br /> approximately three feet below grade, to avoid potential contact with mismarked utility lines <br /> Each <br /> day, prior to field work, the field geologist conducted a tailgate safety meeting to ensure � <br />' proper site safety precautions were identified and also to conform to the IT site specific <br /> Health and Safety Plan <br />' The bonngs were drilled on July 27, 1994 by representatives of Soils Exploration Services <br /> (C-57 license 582696). All drilling was performed using a steam cleaned, 8 inch O.D hollow <br /> stem auger drilling ng (Figure 3) Before advancing to another drill site, the downhole <br /> drilling equipment was steam cleaned to prevent cross-contamination between boreholes. All <br />' rinsate generated by steam cleaning was containerized in marked 55-gallon drums, and <br /> MZ/09-08-941UST/94-0142 nbr 4 <br />