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• 07 May 1998 <br /> AGE-NC Project No 97-0332 <br /> Page 3 of 5 <br /> Each angled soil probe boring will be advanced at an angle of approximately 30° from vertical, <br /> vertical soil probe boring will be advanced near each end of the dispenser island area A description <br /> of angles and distances used for calculating sample depths beneath the UST area is depicted in <br /> Figure 3 <br /> Soil samples will be collected from angled soil probe boring at depths of 10, 15 and 20 feet bsg, soil <br /> samples will be collected from vertical borings at depths of 5 and 10 feet bsg If petroleum <br /> hydrocarbon-impacted soil is encountered during probing activities,probe borings may be advanced <br /> to greater depths in an attempt to determine the extent impacted soil <br /> Soils are to be described using the Unified Soil Classification System (USCS) Soil sample <br /> descriptions and PID screening results will be summanzed on boring logs prepared in a preliminary <br /> site assessment report <br /> If ground water is encountered during probing activities, then grab ground water samples will be <br /> collected from selected probe borings Grab ground water samples will be collected from selected <br /> soil probe borings using a Geoprobe water sampling assembly. For the sampling assembly, probe <br /> rods will be fitted with a retractable ground water screen and advanced to the total depth of each <br /> probe boring, the rods will then he /lulled upward to allow ground water to flow into the screen A <br /> bailer fitting will then be placed on the end of 3/e-inch diameter polyethylene tubing, inserted through <br /> the rod assembly into the exposed screen, through which vaatcr will be manually pumped <br /> 3 2 EQUIPMENT DECONTAMINATION <br /> All probing rods, sampling tools and sample liners used for sample collection will be thoroughly <br /> rinsed with clean water after washing with a solution of Alconox <br /> 3 3 LABORATORY ANALYSIS <br /> Selected soil and/or ground water samples will be analyzed for total petroleum hydrocarbons <br /> quantified as gasoline (fPH-g), volatile aromatics (benzene, toluene, ethylbenzene and xylenes <br /> BTE&X) with methyl tert-butyl ether (MTBE) in accordance with EPA methods 8015m and 8020 <br /> and by EPA Method 8260 for tertiary butanol (TBA),di-isopropyl ether(DIPE), ethyl tert butyl ether <br /> (ETBE) and tert amyl methyl ether(TAME), and to confirm and quantify MTBE if detected by EPA <br /> Method 8020 Laboratory reports and sample chain-of-custody documentation will be presented in <br /> a report with the findings and recommendations <br /> • <br /> Advanced GeoEnvironmentai, Inc <br />