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i <br /> 1 r <br /> 1 23 November 1998 <br /> AGE-NC Project No 95-0103 <br /> Page 5 of 7 <br /> ' detected an any of the soil-vapor samples above the method detection limit <br /> The analytical results of soil-vapor samples are summarized on Table 5 The laboratory report(MAI <br /> ' Lab ID No 92520 and 92521, 94426 and 96249), Quality Assurance and Quality Control (QA/QC) <br /> reports and chain-of-custody forms are included an Appendix C <br /> ' 3 6 MASS OF RECOVERED HYDROCARBONS <br /> ' The hydrocarbon mass removed during the operating period was calculated using the following <br /> equation M= C-Q•t <br /> ' where M=cumulative mass recovered (kg) <br /> C = soil-vapor concentration(kg/m3) <br /> ' Q =extraction flow rate (ml/hr) <br /> t=operational period, in hours <br /> The operational time over the last quarter was estimated to be 100 days The mass of hydrocarbons <br /> po removed was based on laboratory analyses of soil-vapor sample collected and analyzed The mass <br /> of extracted hydrocarbons was calculated for the period using the hydrocarbon concentrations <br /> ' determined from the influent vapor samples collected and the average air flow rate <br /> An estimated.total of 13 48 gallons of hydrocarbons quantified as gasoline were removed from the <br /> tsite The mass calculations are attached in Appendix D <br /> ' 4.0. DISCUSSION/CONCLUSIONS <br /> ' Based upon data collected from the site and the ongoing monitoring during site remediation, AGE <br /> concludes <br /> ' - The relative ground water elevations at the site decreased 15 feet over the last quarter The <br /> map of groundwater contours indicates a depression an the area of the active SVE network <br /> and well MW-1 <br /> ' - Monitoring wells MW-1,MW-2,MW-3,MW4 and MW-5 had ground water approximately <br /> four feet above the top of the screened interval,potentially reducing the effectiveness of the <br /> ' ground water monitoring wells to characterize the dissolved-phase hydrocarbon plume <br /> The greatest concentrations of petroleum hydrocarbons were detected in samples collected <br /> from well MW4 east of the former gasoline USTs location Hydrocarbons were detected at <br /> Advanced GeoEnvironmentsi,inc <br /> 1 <br />