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' 31 October 2003 <br /> • AGE-NC Project No 95-0137 <br />' Page 2 of 6 <br />' a soil-vapor sample was collected by AGE personnel In addition,the dissolved oxygen in the ground <br /> water wells was measured during the quarterly monitoring event <br /> 2 1 1 Soil Vapor System Monitonng and Sampling <br /> The flow rate of extracted soil-vapor(Influent)was measured using a direct-measure flow meter A <br /> magnehelic vacuum gauge was used selectively to measure the vacuum potential at the two inch <br /> influent line between the blower and extraction wells The organic vapor concentrations in the <br /> extracted soil-vapor stream was measured before entering the blower (influent stream) using an <br /> organic vapor meter(OVM)equipped with a photo-ionization detector PID(Thermo Environmental <br /> 580B, 10 OeV, calibrated to isobutylene 100 parts per million ppm) Field measurements recorded <br /> at regular intervals between May and i er are summarized In Table 1 <br /> Soil-vapor samples were collected to document trends in concentrations of hydrocarbon vapor in the <br /> soil vapor extracted by the SVE network and document hydrocarbon mass removal Soil-vapor <br /> samples from the influent str wgiao ected in Tedlar vapor bags on 13 May, 19 June, 24 July, <br />' 14 August and 10 Septemb-r;2 03 using a vacuum pump attached to the influent stream The <br /> samples were labeled, placed in a pre-chilled cooler and transported under chain-of-custody to <br /> McCarnpbell Analytical Inc (MAI) a California Department of Health Services (DHS)-certified <br /> laboratory in Pacheco, California, The samples were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA 'a <br /> Method 8015 Modified, and VO4 f <br /> • Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl tertiary butyl ether Y''' <br /> (MTBE) in accordance with EPA Method 8020 Z'4 <br /> 1 i <br /> ' 22 WELL MONITORING PROCEDURES <br /> Quarterly ground water monitoring activities were conducted on 14 and 16 May 2003 Monitoring <br /> ' wells MW-2 to MW-5 were monitored and sample on 14 May, well MW-I was monitored and <br /> sampled on 16 May 2003 (m ws rAW G,t'n W?} 7-vl tAc i3 u r� o c c .ref" �J ,ry,�d TY�� <br /> pia-.4r !`edJ4.-�J his sjY<<j <br /> 2 1 Well Monitoring and Evacuation <br /> ' A Solinst water level meter was used to measure the depth to ground water in on-site wells MW-1 <br /> through MW-5 relative to the tops of the well casings The ground water elevations and gradient <br /> . were determined from these data(Table 4) <br /> Advanced GcoEnvironmental,Inc <br />