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L) <br /> Geological Technics Inc. Page 7 <br /> Additional Site Characterization Work Plan <br /> Project No.723.2 <br /> December 10,2007 <br /> GTI has previously developed and submitted our June 16, 2006 Site Conceptual Model <br /> (Revised June 2006) to SJC/EHD for review. The data obtained through the above field <br /> work will be utilized to develop an updated Site Conceptual Model revision. <br /> 3.1 Contaminant Distribution <br /> Through interpretation and extrapolation of the data generated through the history of the <br /> project, the distribution of the contamination, both laterally and vertically, will be <br /> determined. The contaminant distribution information will then be used in estimation of the <br /> contaminant mass. <br /> 3.2 Mass Estimation <br /> Mass estimate calculations will be performed to determine the mass of gasoline present in <br /> soil/groundwater at this site. To accomplish this task the soil/groundwater analytical data <br /> obtained from this investigation and historical groundwater monitoring will be used. GTI <br /> will divide up the contaminated zone into a series of layers according to <br /> geology/contaminant concentrations. A computer generated contour will be used to estimate <br /> the area of soil/groundwater that has been impacted in each layer. The area is then multiplied <br /> by the thickness of the layer(s) to get the combined volume of soil and water in the layers. <br /> The volume of groundwater is determined by multiplying the porosity of the soil times the <br /> calculated total volume. The contaminant load is then multiplied with this number to give <br /> the mass of contaminant in milligrams per liter. The contaminant mass in milligrams is then <br /> converted to kilograms. <br /> 4.0 . SCHEDULE & REPORTING <br /> Geological Technics Inc. anticipates beginning fieldwork no later than 30 days after work <br /> plan approval, receipt of encroachment permits and upon issuance of the drilling permit. The <br /> information gathered during this phase of work will be presented in a report that will include <br /> a summary of the geology. Dr. Ray Kablanow, a California professional geologist, will <br /> supervise the project. Copies of the report will be forwarded to both the appropriate County <br /> and State regulatory agencies (SJC/EHD and CRWQCB-CVR). Groundwater monitoring <br /> will continue on a quarterly basis. A report will be issued for each monitoring event and <br /> submitted to the County and State agencies. <br /> i <br />