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�./ %.504 <br /> 20 November 2003 <br /> AGE-NC Project No. 96-0263 <br /> Page 8 of 11 <br /> 8.2. SOIL BORINGS <br /> Eighteen soil pilot borings will be advanced at the site for installation of ozone sparge wells. The <br /> proposed ozone sparge wells will be located to address the impacted ground water in the upper and <br /> Lo lower zones. Proposed well locations are illustrated on Figure 12. The inferred areal distribution of <br /> hydrocarbon-impacted ground water at the site is illustrated in Figures 9 through 11. <br /> LV <br /> 8.3. SOIL SAMPLE COLLECTION AND ANALYSIS <br /> AGE proposes collecting select shallow soil samples from soil borings advanced in the petroleum <br /> hydrocarbon-impacted soil plume. The soil samples will be submitted for physiochemical and <br /> microbiological analysis to determine the feasibility of natural attenuation in shallow soil. <br /> 8.4. OZONE SPARGE WELL INSTALLATION <br /> Eighteen pilot borings will be advanced for the installation of ozone sparge wells in the upper and <br /> lower water-bearing zones. Procedures for well installation are presented in Section 9.1. Proposed <br /> ozone sparge well designs are illustrated in Figures 13 and 14. <br /> 8.5. INSTALLATION OF TOS DISTRIBUTION NETWORK <br /> A system.of 112-inch diameter,poly-vinyl chloride (PVC) tubing will be installed in appropriately <br /> sized plastic conduit within 8-inch wide trenches approximately one foot bsg and routed from each <br /> ozone sparge well head to the proposed ozone generating unit. Following piping placement, the <br /> trench will be backfilled with imported road-base sand,compacted and resurfaced with asphalt.The <br /> proposed ozone sparging distribution system and ozone generator locations are illustrated in <br /> Figure 12. <br /> I`. <br /> 8.6. OZONE SPARGE SYSTEM OPERATION <br /> An ozone generator will be utilized to produce gaseous ozone which will be injected into the <br /> subsurface via microsparge points. The frequency and duration of ozone injection periods can be <br /> �- regulated at the ozone generator control box. Initially, operation of the ozone injection system will <br /> be based on the manufacturer's recommendations. Injection rates, frequency and duration may be <br /> adjusted to compensate for site conditions during the start-up period. <br /> a. <br /> Advanced GeoE nvi ron mental,Inc. <br /> tr <br />