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E • • . 19 June 1998 AGE-NC Project No 98-0465 Page 3 of 5 illustrated on Figure 2 Each angled soil probe boring will be advanced beneath each UST at an angle of approximately 300 from vertical A description of angles and distances used for calculating sample depths beneath the UST area is depicted in Figure 3 Soil samples will be collected from angled soil probe boring at 5-foot intervals from 5-feet bsg to 25-feet bsg If petroleum hydrocarbon-impacted soil is encountered during probing activities,probe bonngs may be advanced to greater depths in an attempt to determine the extent impacted soil Soils are to be described using the Unified Soil Classification System (USCS) Soil sample descriptions and PID screening results will be summarized on bonng logs prepared in a preliminary site assessment report If ground water is encountered during probing activities, then grab ground water samples will be collected from selected probe borings Grab ground water samples will be collected from selected soil probe bonngs using a Geoprobe water sampling assembly For the sampling assembly, probe • rods will be fitted with a retractable ground water screen and advanced to the total depth of each probe boring, the rods will then be pulled upward to allow ground water to flow into the screen A bailer fitting will then be placed on the end of%-inch diameter polyethylene tubing, inserted thi ough the rod assembly into the exposed screen, through which water will be manually pumped Proposed soil boring locations are illustrated on Figure 2 Following borehole advancement,portland cement(grout mix) will be utilized to backfill each borehole utilizing a tremie pipe The PHS-EHD will be given the opportunity to inspect the grout mix prior to backfilling activities 3 2 EQUIPMENT DECONTAMINATION All probing rods, sampling tools and sample liners used for sample collection will be thoroughly rinsed with clean water after washing with a solution of Alconox 33 LABORATORY ANALYSIS Selected soil and/or ground water samples will be analyzed for total petroleum hydrocarbons quantified as gasoline (TPH-g), volatile aromatics (benzene, toluene, ethylbenzene and xylenes BTE&X) with methyl tert-butyl ether(MTBE)in accordance with EPA methods 8015m and 8020, Advanced GeoEnvironmental,Inc