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' 25 April 2005 <br /> AGI;-NC Project No 95-0128 <br /> Page 8 of 8 <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 The <br /> average extraction rate from well EW-2 was at least 10 gallons per minute during the <br /> reporting period <br /> • Approximately 1,509 kg(3,327 pounds)or 532 5 gallons of hydrocarbons were extracted and <br /> adsorbed by the SVE system during the first quarter 2005 Soil-vapor extraction samples <br />! were adequate for continued remediation,however, additional GAC media changes will be <br /> required during the next two quarters of operation <br /> 5.0. RECOMMENDATIONS <br /> Based on the results of this and previous investigations, AGE recommends � <br /> • Continuation of the soil-vapor extraction operation <br /> i <br /> • The dissolved concentrations of TPH and BTEX, along with MTBE detected in the influent <br />'. samples collected from the ground water extraction and treatment system have declined and <br /> generally diminished to levels below what would be considered cost-effective treatment An <br /> excessive amount of low concentration ground water is currently undergoing treatment, <br /> however, the off-site migration of any dissolved MTBE is likely reduced through active <br /> ground water extraction Removal of the ground water extraction remediation system at the <br /> site should be considered <br /> 6.0. LIMITATIONS <br /> Our professional services were performed using that degree of care and skill ordinarily exercised by <br />' environmental consultants practicing in this or similar localities The findings were based mainly <br /> upon analytical results provided by an independent laboratory Evaluations of the hydrogeologic <br /> conditions at the site have been made from a limited number of available data, points (i a water <br /> samples, soil-vapor samples) and subsurface conditions may vary away from these data points No <br /> other warranty, expressed or implied, is made as to the professional interpretations, opinions and <br /> recommendations contained in this report <br />' Advanced GeoEavironmentai,Inc <br />