Laserfiche WebLink
3 .0 PROCEDURES <br /> Analytical results and field measurements of organic vapors <br /> indicate that the highest concentration of contaminants at the site <br /> is located at a depth of 15 to 30 feet. GeoAudit proposes to <br /> excavate to this depth, removing approximately 500 cubic yards. The <br /> soil will be stored on-site pending characterization. After <br /> characterization, the soil will be treated on-site or transported <br /> to a licensed landfill facility. <br /> Lower concentrations of TPH-g and BTE&X were detected at 40 feet, <br /> and xylene was detected at 50 feet. These depths are beyond normal <br /> excavation depths. Alternative remediation techniques for <br /> contaminated soil at these depths will be considered at a later <br /> time. <br /> A representative of GeoAudit will supervise and direct the <br /> excavation and will collect necessary soil samples . To meet the <br /> project obaectives, the following activities will be performed: <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 Administration, U. S. Coast <br /> Guard and US Environmental Protection Agency, 1985. ) <br /> 2) Notify the San Joaquin County Public Health Services - <br /> Environmental Health Division (PHS/EHD) 48 hours prior to work <br /> initiation. <br /> 3) Excavate a volume of soil measuring approximately 20 ft. x <br /> 22 . 5 ft. x 30 ft. deep. The exact area will be determined <br /> during excavation by analyzing the soil on-site using a photo- <br /> ionization detector (PID) . <br /> 4) Stockpile the excavated soil on plastic sheeting, pending <br /> analytical results. <br /> 5) Spray the excavated soil with water (if necessary) to minimize <br /> the release of volatile organic compounds into the atmosphere. <br /> After excavation, cover the soil with plastic sheeting. <br /> 6) As excavation proceeds, monitor excavated soil for the <br /> presence of volatile organics using a photo-ionization <br /> detector (PID) . <br /> 7) Collect soil samples from the bottom and sidewalls of the <br /> excavation using the excavator bucket. Discrete soil samples <br />. will be collected in pre-cleaned brass tubes as directed by a <br /> representative of the (PHS/EHD) . We anticipate collecting 5 <br /> soil samples. <br /> 3 <br />