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1 ' existing data and identification of the data needs and <br /> 2ii investigation tasks for the RI/FS including, at a minimum, the <br /> 11 <br /> 3 ' following information: <br /> 4 (1) A map and description of known site characteristics, <br /> 51 including topography, hydrogeology, buildings and <br /> it 1 <br /> 611 and all other characteristics relevant to an <br /> 7 evaluation of hazardous substance sources, pathways and <br /> 8 receptors and potential impacts on health and the <br /> 9environment; <br /> I <br /> 10 (2) A description of hazardous substance characteristics <br /> I � <br /> 11 including: <br /> 12 (A) A list of all hazardous substances, materials or <br /> 13 wastes which were disposed, discharged, spilled, <br /> i <br /> 141 treated, stored, transferred, transported, handled or 1 <br /> 151 used at the Site and a description of their estimated <br /> 16 volumes, concentrations and characteristics; <br /> 17I (B) a description of all manufacturing processes which <br /> 18are or were related to each hazardous substance, <br /> 19 �I material or waste or which produced any hazardous waste; <br /> 20 '2and <br /> 21 (C) past disposal practices; <br /> 221 (3) A summary of all existing data including air, soil, <br /> 23isurface water, and ground water data that has been <br /> 24 ; previously generated and the QA/QC procedures which were <br /> I <br /> 25 � followed; <br /> 26i (4) A description of the nature and extent of the release <br /> 27 � and/or threatened release, including a summary of actual <br /> -APER 13 <br /> CALIFORNIA <br /> REV. B•'21 <br /> II <br />