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1 ' under the appropriate chain-of-custody protocol and control procedures The laboratory was • instructed to composite each of the three sets of samples (SP-1 through SP-3, SP-4 through SP-6, ' and SP-7 through SPA) into three composite samples ' Each of the three composited soil samples collected from the impacted soil were analyzed for total extractable petroleum hydrocarbons (TEPH) using EPA Method 8015, modified for diesel and for ' total petroleum hydrocarbons using EPA Method 8015, modified for gasoline (TPH-g) Each ' composite soil sample was also analyzed for benzene, toluene, ethylbenzene, and xylenes (BTEX) using EPA Method 84-0 Analytical results indicated soil samples contained up to 7,600 milligrams ' per kilogram (mg/kg) of TEPH, with up to 5,400 mg/kg identified as diesel range hydrocarbons (composite sample SP-1 through SP-3) Analytical results for TPH-g indicated up to 100 mg/kg ' (composite sample SP-1 through SP-3) Benzene and toluene were not detected in any of the composite soil samples Total xylenes and ethylbenzene were reported at concentrations up to 7 1 ' mg/kg and 1 5 mg/kg (composite sample SPA through SP-3) Analytical reports and related documentation are included in Appendix B ' 2.2 _ UST Excavation Backfill ' After sampling the impacted soil on December 19, 1996, Mr Knoll of the EHD authorized The Learner Company to backfill the UST excavation with imported native soil and the impacted soil from ' the original excavation ' Between December 19, 1996 and March 5, 1997, the impacted soil was mixed several times to introduce oxygen to the soil in an effort to enhance biodegradation of hydrocarbons The excavation ' was backfilled with 227 cubic yards of imported native soil and 93 cubic yards of the impacted soil on December 19 and 20, 1996 and March 4 and 5, 1997 1 1 • The Leamer Company-LST InvmWUwn Workplan ' PRE I3V%p9701a9701601 d.031r% 7(lune 1497) 3 } 1 1