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l l13 December 2004 • AGE-NC Project No 99-0645 lPage 2 of 7 A Magnehelic vacuum gauge was temporally attached to the inlet of the blower to measure vacuum pressure exerted on the extraction well, and a cumulative flow meter was utilized downstream of the carbon canisters to monitor air flow Sampling ports were installed upstream of the knockout vessel l and downstream of the 1,500-1b carbon vessels to recover influent and effluent SVE airflow samples used to monitor the efficiency of hydrocarbon removal,in addition,the influent and effluent streams were monitored routinely for the presence of organic vapor using an organic vapor meter (OVM) l equipped with a photo-ionization detector(PID Thermo Environmental 580, 10 0 eV,calibrated to isobutylene) l Field measurements,recorded at regular intervals between 05 October and 17 December 2004, are summarized in Table 4 l22 SVE START-UP The SVE unit is operated in accordance with APCD permit —5984-1 The SVE system began operation on 05 October 2004, when the SVE blower was temporarily connected to a power panel . located on the northern side of the building at the site,initiation of the SVE operation was observed lby representatives of the San Joaquin Unified Air Pollution Control District(APCD) The SVE flow rate, vacuum (potential), and concentrations of hydrocarbons in the extracted soil-vapor were l measured and a set of soil-vapor samples were collected, the soil-vapor samples were collected to document baseline concentrations ofpetroleum hydrocarbons in the soil-vapor extracted by the SVE network and to determine the treatment system hydrocarbon destruction rate l 23 SOIL-VAPOR EXTRACTION lThe SVE system was monitored weekly for the first month of operation and monthly thereafter During each monitoring event, the now rate of extracted soil-vapor(influent) was measured using l a totalizing-flow Blue White roto-meter Vacuum potential was measured at the 2-inch influent line by the magnehelic vacuum gauge In addition,the organic vapor concentrations in the influent stream (before entering the blower) and the effluent stream (after exiting the carbon unit) were measured lusing the OVM Influent and effluent soil vapor samples were collected on 05 October, 13 October, 21 October, l 03 November and 17 November 2004 The influent vapor samples were collected from within a vacuum chamber directly into Tedlar vapor bags, the effluent samples were collected directly out off the effluent stream The samples were labeled,placed in a cooler and transported under chain of Icustody to either Cal Tech Environmental Laboratories (CTEL) in Paramount or to McCampbell • Advanced GeoEnvironmental,Inc