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' 21 May 2001 <br /> • AGE-NC Project No 95-0173 <br /> Page 7 of 7 <br /> and is at least 70 feet thick <br />' Based on SVE remediation data collected between 01 January 2001 and 31 March 2001 AGE <br /> concludes <br /> • The volume of hydrocarbons extracted by the SVE system was calculated to be <br /> approximately 116 gallons of petroleum hydrocarbons (Appendix F) during the first quarter <br /> 2001 monitoring period <br /> • Since initiation of the SVE system, the total volume of petroleum hydrocarbons extracted is <br /> estimated to be approximately 729 gallons (Appendix F) <br /> • An average SVE inlet flow rate 84 cubic feet per minute (cfm) at an average differential <br />' pressure of 2 6 inches of water (Table 5) <br /> • No general concentration trends were evident in the PID field measurements or analytical <br /> results from extracted soil-gas samples over the monitoring period <br /> . 6.0. RECOMMENDATIONS <br /> Based upon first quarter 2001 data collected from the site, AGE recommends <br /> • Continued quarterlyom'ound water monitoring and sampling of wells MW-1 through MW-13 <br /> AW-lA, AW-1B, AW-2A and AW-213, ground water sampling results will be used to <br /> monitor progress of the SVE and IAS remediation system The next quarterly ground water <br /> monitoring event is tentatively scheduled for June 2001 <br />' • Continued operation of the on-site SVE and IAS remediation system, remediation progress <br /> will be reevaluated on a quarterly basis <br /> 7.0. LIMITATIONS <br /> Our professional services were performed using the degree of care and skilt orainamy exercised ny <br /> environmental consultants practicing in this or similar localities The findings were based mainly <br /> upon analytical results provided by an independent laboratory Evaluation of the geologic/hydro- <br /> geologic conditions at the site for the purpose of this investigation is made from a limited number <br /> of available data points (e g ground water and SVE air flow samples), and subsurface conditions <br /> may vary away from these data points No other warranty, expressed or implied, is made as to the <br /> professional recommendations contained in this report <br /> Advanced GeoEnvaronmental,Inc <br />