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' S E C O R Cleanup Plan October 27, 2003 ' Page 11 5.2.3 Waste Management ' Soil generated during excavation activities will be temporarily stored onsite a plastic liner pending transport by the disposal contractor to an appropriate disposal or treatment facility. A California- certified disposal contractor will remove contaminated soil cuttings to an appropriate facility. Water generated during steam cleaning will be temporarily stored onsite in DOT-approved 55-gallon drums ' pending transport by the disposal contractor to an appropriate disposal or treatment facility. 5.3 Groundwater Oxygenation System ' The groundwater oxygenation system shall consist of forty-two oxygenation points along the northwest property line (near well MW-47A), continue around the northern-most property corner (near well MW-50B) and end along the northeast property line (near well MW-51A). Additionally, twenty-three groundwater oxygenation points shall also be installed along a section of the access road that separates the retention ponds from tanks #134 and #135. Locations of proposed oxygenation points are shown on Figure 7. A work plan for oxygenation point installation is presented in Section 6 below. Each groundwater oxygenation point will be equipped with a flow gauge, butterfly valve and pressure ' gauge to control airflow and pressure. In-line auto-drains will also be installed at each groundwater oxygenation point to ensure condensate removal in the transfer pipe. The groundwater oxygenation points will be connected via above grade pipe to an on-site air compressor with a series of in-line �• filters to remove particulates. Airflow to each groundwater oxygenation point will range from 0.5 standard cubic feet per minute (SCFM) [minimum] to 2.0 SCFM (maximum). To increase oxygen delivery and prevent the formation of preferential flow, the system will operate on a rotating on -and- off cycle. This approach will allow any air channels developed near the wells to collapse during the off cycle and maximize the oxygenation during each on cycle. A basic process flow diagram for the proposed oxygenation system is provided as Figure 8. This flow diagram will be used to prepare the design drawings and is subject to modification based on constructability, permit specifications, and physical constraints associated with the site. A construction bid package will be prepared including the design drawings, technical specifications, ' and general construction conditions to describe the type and extent of construction activities to be performed. The package will also include location drawings for the existing and proposed extraction wells, conveyance trenches, utility connections, and the treatment system compound. Copies of ' system design drawings will be made available to the RWQCB upon request. The technical specifications will address details of the design not included in the design drawings, including the methods, engineering standards, and materials which must be used by the contractor during ' construction. The general conditions will present contractual language regarding the procedures and policies which guide the contractors work, including bonding, health and safety, and insurance requirements. 5.3.1 Pre-Construction Activities The construction bid package will be distributed to a minimum of three qualified contractors with experience performing similar projects. A bid walk will be performed to allow potential contractors to view the site and direct questions to the design engineer regarding construction specifications. I:\Chevron\1001621\REPORTS\2003\2003-Cleanup Plan\Cleanup Plan.doc