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• <br />11 <br />All site activities were conducted under the direct supervision of a State of California <br />• <br />Registered Geologist having five or more years of professional experience in groundwater <br />hydrology. The conduct of field operations was supervised by a qualified Geologist <br />designated by the supervising Registered Geologist. All field operations personnel were <br />• trained in accordance with 29 CFR 1910 (40 -hour OSHA health and safety training). <br />Untrained field operations personnel or visitors were not allowed on the site. <br />APPROPRIATE0 OBTAIN <br />AEMC obtained permits from the San Joaquin Local Health Department and the City of <br />Lodi Building Department to remove the USTs before excavation of the USTs was begun. <br />• A 24-hour notice of intent to remove the tank was also given to the City of Lodi Fire <br />Department. <br />0 PURGE TANKS WITH DRY ICE <br />The UST atmospheres were purged with 20 pounds of dry ice per 1,000 gallons of capacity <br />before being pulled from the excavations. Dry ice was introduced into the tanks by AEMC <br />• three hours before inspection by a representative from the San Joaquin Local Health <br />Department. The tanks were probed with a Lower Explosive Limit (LEL) meter and had <br />LEL readings of less than 18% at the time of removal. <br />A track excavator was used to excavate down to and around the tanks. A concrete breaking <br />® jackhammer was used to break out the north wall of the concrete vault overlying the <br />550 -gallon tank. Excavated soil was stockpiled along the perimeter of the excavation. The <br />® r1pbe-o6(ao-6) Page 6 <br />—AM-- CIS — <br />