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04 January 2005 AGE-NC Project No. 96-0235 Page 4 of 5 • Total petroleum hydrocarbons as gasoline (TPH-g) in accordance with EPA Method 8015 Modified; • Benzene, toluene, ethylbenzene and total xylene (BTEX compounds) and methyl tertiary butyl ether(MTBE) in accordance with EPA Method 8020; • 1,2-Dichloroehene (1,2-DCA) by EPA Method 8260 Modified and • General Mineral (metals and anions)by appropriate EPA Methods 700 and 6010. Laboratory reports for soil analysis, testing methods, laboratory quality assurance/quality control (QA/QC) reports, and sample chain of custody documentation will be presented in a report with findings and recommendations. 3.2. WELL COMPLETION Ten soil borings will be advanced for the installation of ozone injection points. Following advancement of the soil boring,one manufacturer-assembled 2-inch by 30-inch microporous sparge point and casing will be installed in each boring; the sparge points will be installed at depths of approximately 35 feet bsg. A 1-inch PVC riser will connect the sparge points to a surface ozone generator. A proposed ozone sparge well construction diagram is depicted in Figure 3. After installing the well casing in each boring,a filter pack material will be slowly emplaced through the augers over the screen interval to approximately two feet above the screened intervals for the monitoring well. The filter pack material in the ground water monitoring wells will consist of pre- washed#3 Lonestar sand.Additional filter pack material will be added if settling occurs.A nominal 2-foot bentonite seal(bentonite chips)will be placed above the filter pack to minimize the potential for grout penetration into the screened section of the well. The bentonite seal will be formed by pouring bentonite chips into the annulus and allowing the pellets to settle on the filter pack. The bentonite pellets will be allowed to hydrate with tap water for a minimum of one-half hour prior to grouting. The remaining annular space will be filled to the ground surface with a cement grout. The grout mixture will consist of Type UH portland neat cement and not more than 6 gallons of water per 94-pound sack of cement. The grout will be placed by pumping through tremmie pipe. A grouting inspection will be scheduled with EHD personnel. Advanced GeoEnvironmental,Inc.