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•� 04 March 1996 <br /> ' AGE-NC Project No 95-0144 <br /> Page 3 of 18 <br /> f ' <br /> -3'2 LOGGING <br /> ' Soil was exiruded from the remaining brass sleeves'and screened for the presence of organic vapors <br /> using a photo-ionization detector (PID Thermo Environmental 580A, 10 0 eV, calibrated to <br /> isobutylene), and the readings were recorded on the boring logs Soil was described in accordance <br /> with the Unified Soil Classification System (see Boring Logs, Appendix A) <br /> ' 3 3 WELL COMPLETION <br /> A two-inch inside diameter core barrel was used to remove soil from a depth of 31 to 35 feet bsg in <br /> ' each probing Subsequently, a two-inch diameter well point was then advanced using the'2-inch <br /> diameter rods Each probing was completed as an in-situ air sparging well using 3 feet of 0 75-inch <br /> diameter PVC casing with 0 010-inch screen from 32 feet to 35 feet bsg,Blank PVC'casing was <br /> ' extended to the surface The casing was attached to the well paint through the rods and the filter pack <br /> _(#2.112 Lonestar,sand) was installed from 35 feet bsg to approximately 30 feet bsg Bentonite sand <br /> i (48 bentonite) was used to make an 8-foot plug above the sand filter pack, and the wells were <br /> >r grouted to the surface with Portland Cement <br /> 3'4 STRATIGRAPHY <br /> a <br /> Fill mateiial was piesent in each boring from surface grade to,depths of approximately 6 feet bsg <br /> ' Silty clay to clayey silt was generally encountered in each probing from depths of 6 to 18 feet bsg <br /> Silty and clayey sand was encountei ed from depths between 18 and 35 feet bsg (total depth) in each <br /> ' probing i <br /> Organic vapors were detected in soil samples collected from depths of 15 to 25 feet bsg in both <br /> ' probings at concentrations up to 298 ppm (IASI-20) Boring logs are°presented as Appendix A <br /> 3 5 ANALYTICAL RESULTS OF SOIL SAMPLES <br /> Total petroleum hydrocarbons as gasoline (TPH-g) were detected in samples IAS 1-20, IAS 1-25, <br /> ' IAS2-20 and IAS2-25 at concentrations of 270, 1 1, 140 and 2 0 mg/kg (parts per million ppm), <br /> respectively No petroleum hydrocarbons wei e detected in samples collected fi om a depth of 15 feet <br /> in either probing Analytical results are summai ized on Table 1 The laboratory report (MAI, <br /> Laboratory ID 960963 - 60968) and chain-of-custody forni are included in Appendix B <br /> h <br />