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. 07 June 2002 AGE-NC Project No. 95.0185 Page 4 of b 4.1. DRILLING AND SAMPLING A soil boring for installation of a ground water well will be advanced to a depth of 30 feet bsg utilizing a truck-mounted, hollow-stem drill rig and 8-inch diameter hollow-stem augers; three soil borings for installation of ozone sparge wells will be advanced to a depth of 40 feet bsg utilizing 8-inch diameter hollow--stein augers. Soil cuttings and rinseate generated during drilling activities will be containerized in properly labeled DOT-approved 55-gallon drums, and stored on-site in an area lacking public access. Disposal alternatives for rinseate and stockpiled soil will be selected based on results of a laboratory analysis. Soil samples will be collected at five-foot intervals for logging purposes, beginning at a depth of 5 feet bsg; at least one soil sample per every 15 linear feet will be analyzed by a State of California Department of Health Services (DHS)-certified laboratory for the following constituents: • Total petroleum hydrocarbons as gasoline and diesel(TPH•-g and TPH-d)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; Fuel oxygenated compounds including MTBE, tertiary-amyl methyl ether (TAME), di- isopropyl ether(DIPS),ethyl tertiary-butyl ether(ETBE)and tertiary butanol(TBA)by EPA method 8260 Modified. 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. ' 4.2. WELL COMPLETION The ground water monitoring well will be completed utilizing a single 2-inch diameter schedule 40 f polyvinylchloride (PVC) well casing with 15 feet of 0.020-inch slotted well screen; proposed monitoring well construction diagram is depicted in Figure 4. soil boring=will.be advanced for_the.installation_of,six,sparge_points.._.Following advancement of the soil boring, two manufacturer-assembled 2-inch by 30-inch microporous sparge points and casings will be installed in each boring; the sparge points will be installed at depths of approximately 25 feet bsg and 40 feet bsg. A3/4-inch PVC riser will connect the sparge points to a surface ozone generator. A proposed ozone sparge well construction diagram is depicted in Figure 5: Advanced GeoEnvironmenW,Inc.