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• 5 April 1993 <br /> (GeoAudit 652-5) <br /> Page 2 of 3 <br /> of tank pit #1, 10 foot depth) at 0. 056 ppm. No contamination was <br /> detected in any other sample. Complete sample results will be <br /> summarized in the assessment report currently being prepared by <br /> GeoAudit. <br /> Field observations and soil sample analysis results indicate that <br /> the lateral extent of the soil contamination is very limited. <br /> However, soil contamination may still exist beneath the floor of <br /> the excavation due to vertical migration of the hydrocarbons. <br /> PROCEDURES <br /> GeoAudit believes that the remaining soil contamination (if any) <br /> can be removed from the tank pit area by overexcavation. An <br /> excavator will be used to remove soil from the floor of the <br /> excavation. A representative of GeoAudit will supervise and direct <br /> the excavation and will collect necessary soil samples. To meet the <br /> project objectives, 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) Overexcavate the existing tank cavity using an excavator to a <br /> depth and area necessary to remove the contaminated soil. The <br /> area will be determined during excavation by analyzing the <br /> soil on-site using a photo-ionization detector (PID) . We <br /> anticipate removing a maximum of 500 yards of soil. <br /> 4) Stockpile the contaminated soil on plastic sheeting. <br /> 5) After excavation is completed, soil will be covered with <br /> 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) Samples will be collected from the floor of the excavation <br /> using the excavator bucket. Soil samples will be collected <br /> from the excavator bucket using a metric soil sampler loaded <br /> with two pre-cleaned brass tubes. A representative of the <br />