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10 June 2008 AGE-NC Project No. 97-0312 Page 9 of 11 be converted from the measured differential pressure and the piping diameter using a nomograph to standard cubic feet per minute(scfm) . Induced vacuum measurements will be recorded from the proposed SVE observation and selected groundwater monitoringwells utilizing Magnehelic gauges. The induced vacuum will be monitored for a stabilized value in inches of water during the SVE tests. Hydrocarbon concentrations in the well effluent stream will be measured at regular intervals. An OVM equipped with a PID will be utilized for field measurements. The radius of influence and hydrocarbon mass removal rate will be estimated from the data collected. 3.4.2. Collection and Analysis of Vapor Samples Vapor samples will be collected at 2-hour intervals during the pilot tests from the inlets of the proposed SVE well VW-1 to measure concentrations of extracted hydrocarbon vapor.The samples will be collected in carbon vapor traps(caracole adsorption tubes)and Tedlar bags using the vacuum chamber to fill the bags with an air pump. Following sample collection,the samples will be placed in a covered container and transported under chain of custody to a CDPH-certified analytical laboratory for analysis. Each sample will be analyzed within 72 hours for the constituents listed in Section 2.4. 3.5. OZONE INJECTION BENCH SCALE TEST In preparation for groundwater remediation utilizing ozone injection,the CVRWQCB policy for the investigation of UST sites requires the determination of site-limits of the detrimental, secondary consequences generated from in-situ ozone injection. Based upon results from several air-sparging and ozone-injection projects with similar geologic conditions,it has been AGE's experience that iron fouling of sparge points has not been a concern to the remediation. However, the Ozone BST is proposed to determine whether general ozone injection into the subsurface has the potential to significantly increase the concentrations of metals which may secondarily degrade water quality. The main goal of the Ozone BST is to assess production of hexavalent chromium(Cr+6)and to secondly measure concentration increases of the secondary metals and general parameters, as well as the degradation of petroleum hydrocarbons. 3.5.1. Baseline Analysis For assessment of baseline conditions, a set of soil and two sets of ground water samples will be utilized for analysis; one soil sample from each soil sampling interval and ground water sample generally from the target intervals. Soil and ground water samples will be analyzed by a CDPH- Advanced GeoEnvironmcntal,Inc.