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05 July 2007 AGE-NC Project No,03-1100 Page 4 of 9 2.5. GROUND WATER SAMPLING AND ANALYSIS Following the installation of the new monitoring well, ground water monitoring and sampling activities will be conducted for the monitoring wells MW-1 through MW-3 and the new monitoring well,MW-8, on a quarterly basis and wells MW-4 through MW-7 on a biannual basis. Monitoring activities will include recording depth to ground water measurements and collection of ground water samples for laboratory analysis by a DHS-certified laboratory for the analytes noted in Section 24. Ground water sample collection protocols are described in Section 3.4. y Laboratory reports for ground water analyses,testing methods,laboratory quality assurance/quality control (QA/QC)reports and sample chain of custody documentation will be presented in quarterly reports with findings and recommendations. r- '7 2.6. OZONE SPARGE POINT INSTALLATION y r r y 1, ,,, Subsequent to the completion of the soil it borings a(Section 2.2. ne sparge points (OZ-4 through OZ-6) will be installed at a inim distance of 2�efbetween well locations, in the designated boreholes in the vicinity former and urrent r complex.Each ozone sparge point will utilize a micro-porous diffuser to distribute"mic - u tiles"of ozone through a filter pack and into the void spaces of the surrounding subsurface. The ozone sparge point will be placed within the saturated zone of the shallow water-bearing unit, into areas of known petroleum hydrocarbon-impacted ground water, generally at the edges of the site. Proposed sparge point locations are illustrated in Figure 2. An ozone sparge point construction diagram is presented in Figure 3. 2.7. OZONE SPARGE SYSTEM INSTALLATION AND MONITORING Following installation of ozone sparge points, the new points will be integrated into the existing in-situ ozone sparge(IOS)regiment. The ozone technology allows for in-situ chemical oxidation of the dissolved and semi-adsorbed petroleum hydrocarbon compounds.Procedures for the IOS interim remediation are presented in Section 3.5. Each of the site related monitoring wells will continue to be monitored and sampled on a monthly basis. Each of the site related monitoring wells (MW-1 thorugh MW-3) will be monitored for dissolved oxygen(DO)and oxidation-reduction potential(ORP). Flow rates,hours of operation,and pressure readings will also be taken during monitoring events. In order to assess the effectiveness and extent of ozone sparging activities on hydrocarbon-degrading bacteria levels in the core contamination area, in addition to existing laboratory analysis, bacterial analysis for ground water Advanced GeoEnvironmcntal,Inc.