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15 April 2004 <br /> •� AGE-NC Project No 99-0559 <br /> Page 12 of 13 <br /> 4 2 MASS-VOLUME REMOVAL CALCULATIONS <br /> I During200 an estimated 248 3 lbs of TPH- or an estimated 25 lbs of benzene and 8 53 lbs of <br /> 3 g <br /> MTBE were extracted from ground water The 2003 volumetric calculations from the ground water <br /> pump-and-treat system are presented In Appendix D <br /> f5 0. SUMMARY AND CONCLUSIONS <br /> Based on the results of ground water remediation activities, AGE concludes the following <br /> • Ground water remediation was initiated at the site In mid-May 2002 Between 15 May and <br /> December 2003, the pump-and-treat system was in operation and processed approximately <br /> 164,246 gallons (621,167 liters) of water AGE estimates that an average 850 gallons of <br /> water was discharged per day during this time <br /> • Dissolved hydrocarbons were detected from ground water samples collected at the Influent <br /> end of the treatment system on every sampling event between May and December 2003 The <br /> highest concentration of hydrocarbons In the extracted occurred in July 2003 <br /> Based on the amount of ground water processed and laboratory analytical results, <br /> approximately 25 lbs of benzene, 8 5 lbs of MTBE and 248 3 lbs of TPH-g were removed <br />` from the extracted ground water between May and December 2003 (Table 1/Appendix D) <br /> 6.0 RECOMMENDATIONS <br /> Based upon the results of ground-water remediation in 2003, AGE recommends <br /> • Continued quarterly ground water monitoring at the site The next monitoring event should <br /> be scheduled <br /> • Continued operation and maintenance of the ground water extraction and treatment system <br /> Additional subsurface assessment directly north, west and east of the UST area to determine the <br /> lateral extent of petroleum hydrocarbon-Impacted and MTBE-Impacted soil may be necessary The <br /> vertical extent of Impacted soil and ground water should be assessed AGE recommends <br /> Implementation of the work plan addendum prepared for the site, dated 02 December 2003 <br /> Based upon data collected during quarterly sampling,AGE recommends quarterlymonrtonng of the <br />' ground water monitoring wells Ground water wells also need to be installed west of well MW-4, <br /> southwest of well MW-3 and north of well MW-I <br />' Advanced Go oEnvironmental,Inc <br />