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• <br /> magnetometry, or electro-magnetic induction to locate underground utilities near the <br /> sample locations. In addition, DigAlert will be contacted at least 2 days prior to <br /> subsurface work in order to mark public utilities that may be located on the subject <br /> property. <br /> Dudek was not able to obtain utility drawings for the property from the City, County or <br /> site owner. Thus, the building perimeters will also be surveyed by the private locator in <br /> order to identify utility areas, so that samples may be collected from these areas. <br /> 5.5.2. Building Floor Plans <br /> Floor plans for all buildings have not yet been obtained. Floor plans and utility entrances <br /> into buildings will be compiled during a site visit and included in the soil gas sampling <br /> report. <br /> 5.5.3. Sample Collection Procedures <br /> 5.5.3.1. Soil Vapor Sample Collection <br /> Soil vapor probes will be installed using a direct posh rig (Geoprobe). Procedures for <br /> probe installation using the Geoprobe and sample ctAm ion will be followed, as <br /> outlined in the March 2012 DTSC Advisory-Active Soil Gas Investigations (DTSC, <br /> 2012). <br /> Probe construction and sample collection details 1! 'x- recorded in the field book. <br /> Installation of the sampling probes are as follows: <br /> • Temporary vapor probes, made of teflon tubing, with a stainless steel (or <br /> other inert material) screen attached to the tip, will be installed at selected <br /> depths for soil vapor sample collection as described on pages 8 and 9 and <br /> shown in Figure 1 (p.1 l) of the 2012 DTSC Advisory-Active Soil Gas <br /> Investigations. <br /> • Sand pack(approximately 1 foot thick) will be placed around the temporary <br /> probe tip, followed by dry granular bentonite(approximately 1 foot thick). <br /> The probe tip will be placed approximately midway in the sand pack. <br /> • Hydrated granular bentonite will be used to seal the remaining distance to <br /> ground surface to prevent ambient air intrusion. <br /> • A down-hole rod will be used to support the tubing in the borehole and to <br /> ensure that the probe tip is placed at the proper depths. <br /> Soil Gas and Soil Sampling Work Plan—Rev.4 7693-05 <br /> Former Kearney-KPF Facility Dudek <br /> Stockton,CA 14 September 2013 <br />