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26 August 2013 AGE Project No. 95-0130 Page 4 of 9 analysis of SVE influent TPH-g air stream concentrations versus time is included with Appendix B. The laboratory report (CTEL Project Nos. CT214-1304127, -1305157 and - 1306106) quality assurance and quality control (QA/QC) and chain of custody forms are presented in Appendix C. 2.3.3. Mass Calculation of Recovered Product The hydrocarbon mass removed during the SVE operating period was calculated using the equation: M = C•Q•t where: M = cumulative mass recovered (kg) C = vapor concentration (kg/M3) Q = extraction flow rate (M3/hr) t = operational period, in hours During the 2nd quarter 2013 (18 March to 17 June 2013), the SVE unit operated a total of 2,180 hours(i.e. approximately 91 days).The average analytical results of the influent SVE samples (Table 1), the average diluted SVE influent flow rates (Table 2) and the operational period (Table 3) were used to calculate the approximate mass of extracted gasoline during this period. During the 2nd quarter 2013 operational period, the total mass of hydrocarbons extracted by the SVE system was calculated to be approximately 175 pounds, or equivalent to a volume of approximately 28 gallons of gasoline. Based on the above mass and time period, total petroleum hydrocarbon (gasoline) SVE extraction rates were estimated to be between approximately 1 to 4 pounds/day. Added to the 24,488 pounds of petroleum hydrocarbons estimated to have been removed by SVE remediation since September2004 (start-up), the total mass of hydrocarbons extracted with SVE to date is estimated at 24,663 pounds (Table 3). 3.0. INTERIM GROUNDWATER EXTRACTION REMEDIATION Between 18 March and 17 June 2013, an interim GW ET remediation system was operated at the site. The groundwater treatment operation and maintenance procedures for the site were outlined in AGE's Interim Remediation Work Plan - May 2003, dated 21 May 2003. Advanced GeoEnvironmental,Inc.