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09 July 1998 <br /> AGE-NC-97-0326 <br /> Page 3 of 6 <br /> dispenser island extends to depths greater than 30 feet bsg, this boring will be extended to ground <br /> water and completed as a ground water monitoring well. The proposed ground water monitoring well <br /> construction diagram is included as Figure 3. <br /> Monitoring wells will be developed utilizing a submersible pump or bailer. Water will be purged <br /> from each well until purged water is essentially sediment free. Purged ground water will be stored <br /> on-site in DOT-approved 55-gallon drums. <br /> 3.4. GROUND WATER MONITORING/SAMPLING <br /> No sooner than 72 hours after installation, ground water monitoring will be performed for each well. <br /> The depth to water and total depth for each well will be measured. A precleaned submersible pump <br /> or dedicated bailer will be used to purge a minimum of three casing volumes from each well. <br /> Stabilization parameters will be measured in the purged water at regular intervals. Following well <br /> recharge of at least 80 percent, a sample will be collected from each well. Purged water will be <br /> placed in 55-gallon DOT containers and stored on-site pending analytical results of water samples. <br /> Ground water flow direction data from the nearby USA gasoline station is inferred to be the same <br /> for the subject property. <br /> 3.5. LABORATORY ANALYSIS <br /> Samples will be transported under chain-of-custody in a chilled container to a state-certified <br /> laboratory for analysis. Selected soil samples and ground water samples will be analyzed for: <br /> • total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 8015m/5030 <br /> • volatile aromatics (benzene, toluene, ethylbenzene, and xylenes: BTE&X) in accordance <br /> with EPA Method 8020/602 <br /> • oxygenates(methyl tert-butyl ether[MTBE],di-isopropyl ether[DIPE],ethyl tert-butyl ether <br /> [ETBE], tert-amyl methyl ether [TAME] and tert-butanol [TBA]) in accordance with EPA <br /> Method 8260. <br /> Laboratory reports,testing methods, laboratory quality assurance/quality control (QA/QC) reports, <br /> and sample chain-of-custody documentation will be presented in a report with the findings and <br /> recommendations. <br /> Advanced GeoEnvironmental,Inc. <br />