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21 March 1991 <br /> (GeoAudit CV 43:C4 . 1. 1) <br /> Page 2 of 3 <br /> zone and therefore will not be suitable for vadose zone mitigation. <br /> In order to efficiently extract vapors from the entire vadose zone, <br /> the installation of a specially designed extraction well at the <br /> former tank location is necessary. Based on the current estimated <br /> depth to the ground water of 60 feet, the proposed well will have <br /> a dual purpose design: to facilitate vacuum extraction of the <br /> vadose zone, and to volatilize free product present on the ground <br /> water. <br /> This work plan pertains only to the installation of the new well. <br /> A more comprehensive work plan detailing the vacuum extraction <br /> method will be submitted to your agency at a later date. <br /> To meet the objective we propose to perform the following items: <br /> 1) Prepare a site health and safety plan in accordance with <br /> Occupational Safety and Health Guidance Manual for Hazardous <br /> Waste Site Activities - Prepared by National Institute for <br /> Occupational Safety and Health, Occupational Safety and Health <br /> Administration, U. S. Coast Guard and US Environmental <br /> Protection Agency, October 1985. <br /> 2) Notify the SJEHD 48 hours prior to work initiation. <br /> 3) Drill one soil boring using truck mounted, continuous flight, <br /> 8-inch diameter hollow stem augers in the former location of <br /> the fuel tank as depicted in Figure 3 . <br /> 4) Obtain discrete soil samples at five-foot intervals from 55 to <br /> 70 feet using a split tube sampler loaded with three pre- <br /> cleaned brass tubes. <br /> 5) Decontaminate sampling equipment in a tri--sodium phosphate <br /> solution (TSP) and rinse twice with water prior to each <br /> sampling run. <br /> 6) Preserve soil samples in the lead brass tube by covering both <br /> ends with aluminum sheets, capping and sealing with tape. <br /> 7) Label and log soil samples on a chain of custody form. <br /> 8) Store samples under ice pending transport to a State certified <br /> environmental laboratory. <br /> 9) Monitor auger returns and soil sample duplicates for the <br /> presence of volatile organics using a photo-ionization <br /> detector (PID) . <br />