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A standard Caltrans encroachment permit from District 10 is required for this investigation, and <br /> will be obtained prior to any fieldwork. Underground Service Alert will be notified of the <br /> subsurface investigation at least 48 hours prior to initiation of the investigation. <br /> Prior to the initiation of fieldwork, a site Health and Safety Plan will be prepared in accordance <br /> with 29 CFR 1910.120. The health and safety plan will include safety procedures for work to be <br /> performed at the site, chemical hazard information, site safety officers, and preferred medical <br /> emergency locations. <br /> In the case of high traffic volume and/or narrow shoulder widths, traffic control will be <br /> necessary. The IT site safety officer and IT project will coordinate the traffic control with the <br /> Caltrans TO (task order) manager. <br /> 4.2 Task 2: Field Investigation <br /> This task will include the advancement of approximately 60 soil borings for collection of soil <br /> samples along aforementioned locations along State Route 120 and Austin Road. Boring <br /> locations were selected by Caltrans to provide data for systematic random evaluation of <br /> subsurface conditions. . IT will provide traffic control, which will consist of shoulder closure <br /> and an arrow board to alert traffic of the work. The work will be conducted within the shoulders <br /> of SR 120 and Austin Road. A geophysical survey and advancement of borings for groundwater <br /> samples collection will occur on the northeast, northwest and southwest corners of the SR 120 <br /> and Austin Road intersection. <br /> The boring locations will be established using a global positioning system (GPS) with sub-meter <br /> horizontal precision. The vertical precision is reported to be 2 to 5 times that of the horizontal <br /> precision. The locations will be reported using latitude and longitude. The positions of each <br /> borehole location will be presented to Caltrans in GIS database format per the task order. <br /> The soil and groundwater samples will be stored on ice in an insulated chest and will be <br /> transported under a chain-of-custody manifest to a California-certified analytical laboratory. All <br /> drilling equipment will be washed prior to drilling. In addition, to minimize cross-contamination <br /> between borings, all appropriate downhole drilling and sampling equipment will be washed <br /> between borings. The lead study borings will be backfilled with the soil cuttings. The borings <br /> advanced for groundwater sample collection will be backfilled with a bentonite-cement grout and <br /> the soil cuttings placed into drums for storage at the site. Liquid wastes are not expected to be <br /> IT Corporation 2 120Auslia_wkp <br />