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Uil 31 May 2002 AGE-NC Project No 01-0827 Page 2 of 7 2 2 SOIL-VAPOR EXTRACTION (SVE) MONITORING PROCEDURES On 10 December 2001, a pre-existing SVE well network was start-up tested, the SVE/IAS system was inspected or maintained weekly and monitored monthly during operation The SVE's carbon media was changed on a regular basis between 10 December 2001 and 15 April 2002, to allow for hydrocarbon destruction/adsorption IDuring each SVE/IAS monitoring event, measurement of the SVE flow rate, vacuum (potential), concentrations of hydrocarbons in the extracted soil-vapor and collection of a set of soil-vapor ' samples were conducted by AGE personnel The flow rate of extracted soil-vapor (influent) was measured using a direct measure flow meter A magnehelic vacuum gauge was used to measure the vacuum(potential) at the vapor extraction wells The organic vapor concentrations in the extracted soil-vapor stream was measured before entering the blower (influent stream) and after exiting the carbon units(effluent stream)using an organic vapor meter(OVM)equipped with a photo-ionization detector(PID Thermo Environmental 580A, 10 OeV, calibrated to isobutylene 100 ppb) �. 23 SOIL-VAPOR SAMPLING AND ANALYSIS Soil-vapor samples were collected to document trends in concentrations of hydrocarbon vapor in the ' soil-vapor extracted by the SVE network and to determine the treatment system hydrocarbon destruction rate Soil-vapor samples from the influent and effluent streams were collected in Tedlar vaporbags on 10 December2001, 18 December 2001,29 January 2002, 11 February 2002, 11 March ' 2002 and 15 April 2002 The samples were labeled, placed in a pre-chilled cooler and transported under chain-of-custody to either McCampbell Analytical, Inc (MAI) or Cal Tech Environmental Laboratories (CTEL), both laboratories are State of California Department of Health Services ' (DHS)-certified analytical laboratories The samples were analyzed for • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA ' Method 8015 Modified and • Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl tertiary-butyl ether ' (MTBE) in accordance with EPA Method 8020 or 8021 ' 24 WELL MONITORING AND EVACUATION On 25 February 2002, a Solinst water level meter was used to measure the depth to ground water in ' ground water monitoring wells MW-2 and MW-4 through MW-8 After recording water level • measurements, a dedicated disposable bailer was used to purge each monitoring well of standing ' water Approximately 5 to 6 5 gallons of water(a minimum of 3 casing-well water volumes) were Advanced GeoEnvcranMental,Inc 1