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• 31 January 1997 <br /> AGE-NC Project No 95-0125 <br /> Page 3 of 7 <br /> hydrocarbons were excavated from the former UST area Excavated soil was stockpiled on-site, <br /> north of the maintenance building Water was encountered in the excavation at a depth of <br /> approximately 8 feet below surface grade A total of eleven soil samples were collected from the <br /> sidewalls and floor of the excavation,under the direction of Ms Margaret Lagono of the PHS-EHD <br /> TPH-g was detected in soil samples collected from the sidewalls of the excavation at concentrations <br /> as high as 1,600 ppm (7-East) Toluene, ethylbenzene and xylenes were detected in excavation soil <br /> samples at concentrations ranging from 0 0072 ppm (toluene, 3-East) to 100 ppm (xylenes, 7-East) <br /> Benzene was not detected in any of the samples collected <br /> Under the authorization of the PHS-EHD, approximately 44 tons (32 cubic yards) of pea gravel and <br /> crushed rock were placed on the bottom of the excavation The pea gravel and crushed rock was used <br /> to fill the excavation above the free standing water in the excavation The excavation was then <br /> backfilled using clean fill sand, approximately 240 cubic yards and 14 cubic yards of gravel was <br /> used to cover the excavation Results of the excavation were detailed in AGE Quarterly Report, <br /> dated 26 February 1996 <br /> . <br /> 26 ESTIMATION OF IMPACTED SOIL MASS <br /> Approximately 8,880 cubic feet (325 cubic yards) of hydrocarbon-impacted soil was estimated to <br /> remain at the site, prior to the excavation during December 1995 Impacted soil likely extended <br /> vertically under the maintenance building, to the eastern edge of the site and to the north of the bus <br /> driveway on the site The impacted soil is likely vertically limited from a depth of five to ten feet <br /> bsg With an average concentration of 400 ppm in the soil sample collected during the December <br /> 1995 excavation, the mass in place was approximately 148 kilograms of gasoline (52 gallons of <br /> gasoline) <br /> Approximately 3750 cubic feet (138 cubic yards) of impacted soil was removed during the <br /> excavation in December 1995 The mass of gasoline removed was approximately 63 kilograms of <br /> gasoline(22 gallons of gasoline) The estimated remaining hydrocarbons-impacted soil is 5050 cubic <br /> feet(I87 cubic yards) While the remaining gasoline mass in place is approximately 30 gallons of <br /> gasoline <br /> 27 SOIL STOCKPILE AND PURGE WATER SAMPLING <br /> Stockpiled soil was sampled by representatives of AGE on 05 January 1996 Four samples were <br /> collected from the stockpiled soil and from containerized purged water stored on-site TPH-g was <br /> detected in stockpiled soil samples at concentrations up to 480 ppm (SP3) BTE&X were detected <br /> in stockpiled soil samples at concentrations up to 13 ppm (xylene, SP2) No hydrocarbons were <br />