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c) For operable unit RAPS : Briefly describe the scope <br /> and role of the operable unit (if .appropriate) . <br /> 1) If the RAP does not address the entire site, this <br /> optional section should be tailored to the operable <br /> unit by describing the scope of the problem addressed <br /> by this RAP, and its role within the overall site <br /> cleanup strategy. The purpose of each operable unit <br /> and its sequence should also be described. All <br /> subsequent RAP sections should focus on this operable <br /> unit. <br /> • Describe the scope of problem that the RAP for the <br /> operable unit will address. <br /> • Identify how the RAP for the operable unit addresses <br /> principal threat (s) . <br /> 2) The following example describes operable units, and <br /> can be adapted for use at other sites : <br /> "DTSC divided the site into two principal Operable <br /> Units (OUs) in June of 1992 . Operable Unit A (OU-A) <br /> encompasses soils at the site while Operable Unit B <br /> (OU-B) encompasses sediments, . surface water (in <br /> particular Refugio Creek and the San Pablo Bay <br /> intertidal mud flat areas) , and the groundwater at the <br /> site . The purpose of this division into major <br /> operable units was to allow the remedial actions for <br /> site soils OU-A to proceed while additional <br /> investigations of sediments, surface. water, and <br /> groundwater continued. OU-A is further divided into <br /> six OUs, OU-1 through OU-6 . This RAP addresses <br /> remedial action for OU-A only. OU-2 investigations <br /> are proceeding separately. " <br /> 7 . 3 Remedial Investigation <br /> Briefly describe the Remedial Investigation (RI) <br /> activities and the scope of the RI . Include map (s) and <br /> figure (s) with location of soil borings and walls; plume <br /> maps; and/or soil contamination map (s) as applicable. <br /> 7 . 4 Summary of Removal Actions <br /> Briefly describe the removal actions that were taken prior <br /> to the- RAP. Removal actions may include, but are not <br /> limited to: fencing and posting; drainage control; <br /> interim capping; chemical stabilization; removal of <br /> contaminated soil; containerized waste removal; setting up <br /> alternative water supply; interim groundwater extraction, <br /> etc. <br /> 10 - 11/16/95 <br />