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r� 04 February 2000 F}r, AGE Project No. 95-0118 Page 2 of 7 - destruction rate of the extracted hydrocarbon vapor. l.:.f AGE installed an in-line flow meter on the influent line leading to the blower motor as well as sampling ports on the influent line leading to the knockout dram, between the IC and on the effluent =_ line exiting the IC to monitor the concentration of extracted hydrocarbons and efficiency of ,-i hydrocarbon destruction. 2.2. SPARGE SYSTEM INSTALLATION On 01 and 02 July 1999, setup of the air-injection system was conducted. A network consisting of schedule 40 PVC piping one-inch piping,valves and unions were installed from the IAS wells to a compressor-based EnviroSparge IAS system. The IAS unit was installed at the site on 24 July 1999. The IAS system delivers 7 to 10 standard cubic feet per minute (scfin) at a pressure of 12 to 15 "j pounds per square inch.which is adequate to volatilize the petroleum hydrocarbons in the ground water and transfer hydrocarbons from the dissolved ground water state into the soil-gas vapor phase. The EnvioSparge IAS system began full operation on 01 September 1999. } 2.3. SPARGING/EXTRACTION SYSTEM MONITORING The IAS/SVE system was monitored.daily for the first week of operation and weekly thereafter. During each monitoring event, the depth to ground water and per cent dissolved oxygen were _ measured for each monitoring well (Tables 3). General system maintenance and adjustments were performed at this time. The sparging flow rate was adjusted to approximately 10 scfm and to a minimum pressure of 15 psi. The flow rate of extracted vapors was measured using a Dwyer differential pressure flow meter. r Organic vapor concentrations in the extracted soil gas stream were measured before entering the r blower (influent stream), between the carbon canisters and after exiting the canisters (effluent stream) using a photo-ionization detector (PID: Thermo Environmental 580A, 10.OeV, calibrated to isobutylene). Soil vapor samples were collected on 15 September, 01 October, 01 November, 06 December 1999 in Tedlar bags from the influent and effluent streams. The samples were labeled, placed in an ice chest and transported under chain-of-custody to Precision Enviro-Tech (PET) in Stockton. A set of soil vapor samples were then collected on 03 January 2000 in Tedlar bags from the influent and effluent streams. The samples were labeled, placed in an ice chest and transported under chain-of- Advanced GeoEnvironmental,Inc. '_I