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06 August 2004 <br /> AGE-NC Project No 95-0128 <br /> Page 10 of 11 <br /> I gauge will be attached to the piping at the inlet of the blower The air flow will be monitored using <br /> a dedicated Blue While flow sensor The vapor stream at the SVE inlet can be monitored for the <br /> presence of organic vapor using an OVM Sampling ports are to be installed upstream of the vacuum <br /> blower inlet to recover influent soil-gas vapor stream samples, and downstream of the carbon to <br /> recover effluent stream samples to monitor the efficiency of hydrocarbon adsorption <br />' 4.0. SUMMARY AND CONCLUSIONS <br /> The following conclusions were drawn from the results of this quarterly investigation <br />' 41 WATER TREATMENT SYSTEM <br /> • A volume of 288,091 gallons were extracted between 11 September 2003 and 15 May 2004 <br /> A total of 1,858,469 9 gallons have been extracted since the inception of the ground water <br /> treatment in October 2001 <br /> During the this reporting period,approximately 0 308 kg/0 68 lbs of MTBE,0 169 kg/0 373 <br /> lbs of benzene and 1 874 kg/4 13 lbs of TPH-g were removed from the site and treated by <br /> the ground water extraction system A total of 9 98 lbs of MTBE, 4 753 lbs of BTEX and <br />' 7143 lbs of TPH-g have been 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 10 feet of ground water is present in the well EW-1 casing <br />' 42 QUARTERLY GROUND WATER MONITORING <br /> • Ground water elevations measured during the March 2004 monitoring event ranged between <br />' 20 67 feet to 22 08 feet below MSL The depth to ground water increased an average of <br /> 0 6 feet since the last ground water monitoring event The ground water flow direction was <br /> determined to be east to northeast and is similar to the flow directions determined in previous <br /> monitor iiag events <br /> • Dissolved petroleum hydrocarbons quantified as TPH-g and TPH-d were detected in ground <br />' water samples MW-4,MW-5 and VW-1,collected within the northeastern portion of the site <br /> and in well MW-11A on Pacific Avenue <br /> • Various BTEX compounds were detected in ground water samples MW-4,MW-5 and VW-I <br /> . with the highest concentrations detected in sample VW-1 The benzene concentrations in <br /> samples MW-4,MW-5 and VW-1,the toluene concentration in VW-I and the ethylbenzene <br /> 1 Advanced GeoEnviron mental Inc <br /> I <br />