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low <br /> under the direction of IT Corporation representatives. Inspector Harlan Knoll of the SJCPHS- <br /> EHD was present to witness the overexcavation and verification sample collection. The <br /> 4 eastern half of the excavation was overexcavated from an original depth of 17.0 feet to a final <br /> depth of 20.0 feet, using an excavator. The removed soils (approximately 50 yd) were <br /> stockpiled adjacent to the western edge of the gasoline tank excavation for future disposal. <br /> Upon review of overexcavation verification sample analytical results, permission to install the <br /> new tank in the gasoline tank excavation was granted by Harlan Knoll. Authorization to use <br /> the gasoline tank overburden stockpile as backfill for the diesel tank excavation was also <br /> r.. granted by Harlan Knoll. Reinstallation of these soils was conducted on May 3, 1996. The <br /> n new 15,000 gallon split UST was installed on May 6, 1996 under supervision of a SJCPHS- <br /> EHD representative. <br /> 2.3 Soil Sampling <br /> Under the direction of Inspector Letitia Briggs on May 2, 1996, five soil samples were <br /> collected from the diesel and unleaded gasoline tank excavations. Three of these samples <br /> (SSA-EMR-001, SSA-EMR-002 and SSA-EMR-003) were collected at the base of the <br /> gasoline tank excavation and two of the samples (SSA-EMR-004 and SSA-EMR-005) were <br /> +� collected from the base of the diesel tank excavation, following the removal of all fill <br /> materials from each excavation. No soil sampling was required beneath the UST pipelines, as <br /> O.W the piping was fully contained within the tank excavation area. Two four point composite <br /> soil samples (STP-EMR-001 and STP-EMR-002) were collected from the overburden <br /> stockpiles. <br /> On May 3, 1996, following overexcavation activities conducted in the eastern half of the <br /> gasoline tank excavation, three soil samples (SSA-EMR-006, SSA-EMR-007 and SSA-EMR- <br /> 008) were collected from the overexcavated area under the direction of SJCPHS-EHD <br /> inspector Harlan Knoll, at depths of eighteen and twenty feet below grade. <br /> ONO The soil samples from the tank excavation side walls and floor were collected from native <br /> soil in the backhoe or excavator bucket, utilizing two-inch by six-inch brass sleeves. The <br /> 60 UST overburden and overexcavation stockpile samples were collected using a sample coring <br /> device containing two inch by six inch brass sleeves. The sample corer was driven into each <br /> desired sampling location using an attached slide hammer. Soil sampling locations are shown <br /> 3 <br /> w <br />