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' 16 January 2003 AGE-NC Project No. 98-0450 ' Page 4 of 8 each well-head at wells IAS-1 through IAS-9 and connected to the outlet of the air-compressor on-site. ' Induced vacuum was measured utilizing a Magnehelic vacuum gauge attached to the inlet of the blower; SVE air flow was monitored using a Dwyer DS-200 or Blue While flow sensor. The SVE air flow along the effluent-line was monitored routinely for the presence of organic vapor using an ' organic vapor analyzer (OVA) equipped with a photo-ionization detector (PID: Thermo Environmental 580B; 10.0 eV; calibrated to isobutylene). Sampling ports were installed upstream of the vacuum blower inlet to recover SVE influent air flow vapor stream samples to monitor the ' hydrocarbon concentrations.Field measurements were recorded at regular intervals throughout the quarters and are summarized in Table 5; SVE performance at the site is summarized in Table 6. ' Seven sets of soil-vapor samples were collected during the third and fourth quarters of 2002. The samples were collected in Tedlar vapor bags using a vacuum pump attached to the influent stream sample ports. These samples were labeled, placed in a pre-chilled cooler and transported under chain-of-custody to MAI. The samples were analyzed for: • • (TPH-g in accordance with EPA Method 8015 Modified and • BTEX in accordance with EPA Method 8021B. ' 2.4. SPARGE ,SYSTEM MONITORING ' The effect of the IAS system was monitored utilizing a YSI-55 dissolved oxygen meter on ground water.During each monitoring event,the depth to ground water and percentage of dissolved oxygen ' were measured for available monitoring wells. General system maintenance and adjustments were performed at this time. The sparging flow rate was adjusted to approximately 4 standard cubic feet per minute (scfin) and to a pressure of up to 6 pounds per square inch (psi) at the wells. 1 3.0. FINDINGS ' The contaminant impact to soil was quantified from the confirmation soil sample laboratory data. Ground water elevation, flow direction and gradient were determined from field data collected on 11 December 2002; the contaminant impact to ground water was quantified from the ground water laboratory data. From field data collected at the SVE remediation system between July and December 2002, AGE determined the average TPH-g concentration, the average flow rate and ' calculated the approximate mass and volume of gasoline removed. ' Advanced GeoEnvironmental,Inc. 1