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' 28 February 2005 <br /> . AGE-NC Project No 95-0121 <br />' Page 3 of 5 <br /> underground from each well-head at wells VW-1 through VW-9 to the inlet of the regenerative <br /> vacuum blower, the outlet from the vacuum blower is routed through two sequential, 55-gallon <br /> carbon canisters A Magnehelic vacuum gauge is attached to the inlet of the blower Air flow is <br />' continuously monitored using a Dwyer DS-200 flow sensor The flow rate is determined from the <br /> measured differential pressure and the piping diameter using a nomograph The vapor stream at the <br /> SVE inlet is routinely monitored for the presence of organic vapor using an organic vapor analyzer <br />' (OVA) equipped with a photo-ionization detector (PID Thermo Environmental 580, 10 0 eV, <br /> calibrated to isobutylene) Sampling ports are installed upstream of the vacuum blower inlet to <br /> recover influent soil vapor stream samples, and downstream of both carbon canisters to recover <br />' effluent stream samples to monitor the efficiency of hydrocarbon filtration Monitoring data is <br /> included in Table 1 <br />' 24 COLLECTION AND ANALYSIS OF SOIL VAPOR SAMPLES <br /> Influent and/or effluent soil vapor samples were collected on 23 February, 10 March, <br /> 27 April, 26 May, and 26 June 2004 The samples were collected in Tedlar vapor bags using a <br /> . vacuum pump attached to the influent (and effluent) sampling ports The samples were labeled, <br />' placed in a chilled container, and transported under chain of custody to Cal Tech Environmental <br /> Laboratories (CTEL), a California Department of Health Services (DHS)-certified analytical <br /> laboratory, for analysis The samples were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 8015 Modified, and <br /> • Benzene, toluene, ethylbenzene, and total xylenes (BTEX) and methyl tertiary- <br /> butyl ether <br /> (MTBE) in accordance with EPA Method 8021 <br /> i - <br />' 3.0. FINDINGS <br /> The impact of petroleum hydrocarbon constituents to soil vapor samples were quantified by - <br /> laboratory analytical data <br /> i <br /> 3 1 SOIL VAPOR EXTRACTION T <br /> Between 03 February and 22 June 2004, the SVE unit operated for approximately 3,306 hours <br /> Extraction flow rates ranged from approximately 38 cubic feet per minute(cfm)to73 cfm Soil vapor <br /> . extraction data is,presented in Table 1 <br /> Advanced GeoEnvironmental,Inc <br /> I y <br />