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of hydrocarbons that are not acceptable for disposal at a Class III landfill, ARCO will <br />apply for a permit from the San Joaquin Air Pollution Control District to aerate soil at <br />the Site. Aeration will be conducted according to any conditions stated in the permit. <br />5.7 Installation of New USTs and Tank Cavity Wells <br />Following the excavation of all the soil within the shoring to a depth of 14 ft., four new <br />10,000 -gallon, double-wall fiberglass USTs and four tank cavity wells will be installed <br />in the tank cavity excavation. The four wells will be located in the corners of the tank <br />cavity excavation. The wells will be installed to a depth of 14 ft. bgs and consist of <br />slotted PVC pipe. The wells will allow for future extraction of ground water from the <br />tank cavity. The space in the tank cavity excavation surrounding the USTs and wells will <br />be backfilled with pea gravel. <br />5.8 Installation of Vault Boxes and Remediation Piping <br />ARCO plans to implement a vapor extraction and ground water treatment system to <br />remediate the petroleum hydrocarbons in the soil and ground water at the Site. Brown <br />and Caldwell Consultants is in the process of designing a soil and ground water <br />remediation system for the Site. To reduce future trenching across the Site, vault boxes <br />and subsurface piping associated with the remediation system will be installed <br />concurrently with backfilling the former product tanks and piping. <br />Vault boxes will be installed over existing wells and at the proposed locations of future <br />wells. Piping and conduits for vapor extraction, ground water recovery, and air sparging <br />will be installed from the vault boxes to the proposed remediation compound location. <br />The piping will allow for connection of the wells to treatment systems in the future. <br />7 Doc #A159W01.1.5 <br />