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' 14 February 2005 <br /> • AGE-NC Project No 95-0128 <br />' Page 5 of 6 <br /> 3 2 MASS CALCULATION OF RECOVERED PRODUCT <br /> The e mass of hydrocarbons removed was calculated from the volume of water treated and the <br /> concentrations from laboratory analysis A total volume of 230,860 gallons was extracted between <br /> May and December 2004,based on effluent flaw meter observations Generally,poor ground water <br /> production was observed during the operation of extraction well EW-1,while excellent ground water <br /> production was observed after extraction began from well EW-2 <br /> Based on the total water volume extracted, 0 516 lbs of MTBE, 0 02 lbs of benzene and 1 69 lbs of <br /> TPH-g were removed from the site and treated The hydrocarbon mass removal calculations and the <br /> concentration trends of the influent samples over time are displayed in Appendix C <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> The following conclusions were drawn from the results of remediation operation <br /> • A volume of 230,860 gallons were extracted between 15 May and 14 December 2004 A <br /> •` total of 2,048,941 gallons have been extracted since the inception of the ground water <br /> treatment in October 2001 <br /> • During the reporting period, approximately 0 516 lbs of MTBE, 0 02 lbs of benzene and <br /> 169 lbs of TPH-g were removed from the site and treated by the ground water extraction <br /> system A total of 10 5 lbs of MTBE, 4 77 lbs of BTEX and 73 12 lbs of TPH-g have been <br /> removed since October 2001 <br /> • The average extraction rate from well EW-1 was less than 2 gallons per minute during the <br /> reporting period Approximately 6 feet of ground water is present in well EW-1 casing <br /> While the average extraction rate from well EW-2 was at least 10 gallons per minute during <br /> the reporting period <br /> 5.0. RECOMMENDATIONS <br /> Based on the results ofI dprevious <br /> th s an Investigations, AGE recommends <br /> • Continued ground water monitoring of the site Removal of wells MW-7, MW-9, MW-10, <br /> MW-13, MW-14 from the sampling schedule <br /> • Continued Interim ground water extraction and treatment as a remedial measure with <br /> • incorporation of well EW-2 for ground water extraction Initiation of soil vapor extraction <br /> Advanced GeoEnvironmental,Inc <br />