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1 <br />' 20 April 2000 <br /> • AGE-NC Project No 95-0143 <br /> 1 <br /> Page 3 of 6 <br />' The depth to ground water and dissolved oxygen concentrations in ground water were measured on <br /> 03 December 1999, OI February 2000 and 08 March 2000, in addition to the quarterly monitoring <br /> event of 07 to 09 February 2000 Ground water elevation data are summarized on Table i Dissolved <br />' oxygen data are summarized on Table 5 <br />' 2 4 HYDROCARBON MASS CALCULATIONS <br />' The chart recorder printout for the SVE unit was examined to determine the actual operational time <br /> and flow rate of the SVE unit The volume of extracted soil vapor removed was then calculated <br /> Analytical results for the three soil vapor samples collected from the SVE intake were plotted on a <br />' graph and two trend lines added (Appendix D) The volume of soil vapor removed and the average <br /> hydrocarbon concentrations were divided into two data sets. based on the time of collection of the <br /> second soil vapor sample The mass of hydrocarbons removed from the site was then calculated <br />' A summary of the SVE system operational time and flow rates, the hydrocarbon concentration graph <br /> and the mass calculations are Included in Appendix D <br />�i <br /> 2 5 WASTE WATER DISPOSAL <br />' On 03 March 2000, water collected during purging of monitoring wells and from the knockout drum <br /> P � g g <br /> of the SVE system was disposed Approximately I240 gallons of water was transported by Nor Cal <br />' Oil, under non-hazardous water manifest, to Seaport Environmental in Redwood City for disposal <br /> The manifest Is Included in Appendix E <br /> 30 FINDINGS <br />' Ground water elevation and flow direction were calculated from field data, hydrocarbon-impact to <br /> soil and ground water was inferred from laboratory analysis and field observations The approximate <br />' mass of hydrocarbons removed by soil vapor extraction was calculated <br />' 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> The elevation of ground water in each well was calculated by subtracting the depth to water from the <br /> surveyed casing elevation (Table 1) Between November 1999 and February 2000, ground water <br /> • elevations increased an average 0 58 feet Ground water elevation increased an average of 2 6 feet <br /> between February and March 2000 During the February 2000 monitoring event, ground water <br /> Advanced CeoEmiron mental Inc <br /> t <br /> _ s <br />