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4.0 DATA INTERPRETATION <br /> The data will be analyzed and interpreted to assess the impact of tank leakage on <br /> soil and groundwater qualit) To assess these conditions, California Fuels will <br /> consider <br /> 1) the distribution of hydrocarbons within soils and groundwater, <br /> 2) the relative position of the groundwater table, <br /> 3) the distribution of hy drostrati graphic units, and <br /> 4) the rclati%a permeability of the hydrogeologic units <br /> The distribution of hydrocarbons in soil and groundwater, and the relatttc <br /> position of the groundwater table, will idcntify the source(s) of contamination <br /> Materials encountered while drilling will be logged to idcntify hydrostratigraphic <br /> units which could function as contaminant pathways <br /> The combined consideration of all of these data will be used to render an opinion <br /> regarding the extent of contamination This information will be used to determine <br /> the need to conduct a Phase II Soils and Groundwater Ing cstigation <br /> 4.1 Reporting <br /> The findings "ill be presented in the format of a Prcliminary Ing cstigation and <br /> Assessment Report (PIER) as described in APPENDIX A of the "TRI-REGIONAL BOARD <br /> ST %IT RECOMMENDATIONS FOR PRELIMINARY EV AL.UATION AND INVESTIGATION OF <br /> UNDERGROUND T X NK SITES" dated 15 Noi ember 1990 (per pg A-6 of Draft Appendix <br /> 1) The report w ill pro;idc <br /> • A groundwater ]c%cl maps corrected for floating liquid phase hydrocarbon <br /> thickness, <br /> e 1 hNdrogcologic cross section showing the lateral extent of TPH and BTEZ <br /> I Z' t t• <br /> contamination <br />�s • Isopach's of floating liquid phase h)droearbon isopach, and <br /> • Total BTE1 and TPII as gasoline and diesel fuel in groundwater concentration <br /> maps <br /> 15 <br />