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Ms. A i Kolata August 14, 2012 Page 2 of 9 and disposed at a nearby landfill. Soil confirmatory samples were collected from the sidewalls and floor of the resultant excavation and tested for total petroleum hydrocarbons (TPH). TPH was detected in four of the six samples collected. The concentrations detected exceeded the Risk Integr ted System of Closure (RISC) Residential Default Closure Levels. As a result, a release was re orted on January 19, 2007 (LUST incident #200702503). On February 15, 2007, Envirorunental Incorporated completed and submitted to the IDEM -UST Section an Underground Storage Tank System Closure Report documenting all of the closure activities to date. Based on the results of the UST closure, Environmental Incorporated requested IDEM issue a No Further Action (NFA) Letter, The UST Section of IDEM concluded that the closurc report prepared by Environmental Incorporated was incomplete since the appropriate soil parameters were not tested for, no groundwater sample was collected and tested, and no decontamination procedures were provided. The NFA request was not approved. IDEM requested that the nature and extent of soil and groundwater contamination be defined with t e results being provided in an ISC report and if necessary a FSI report. Weaver Boos comp] ted ISC activities and forwarded an ISC report to IDEM in May 2010. The ISC report concluded the following: W the Constituents detected in the groundwater above Indiana RISC residential closure levels include TPH, benzo(a)pyrene, and 1,2- dichloroethane. Groundwater impacts were identified at a depth of approximately 22 -24 feet below the ground surface and migrating to the southwest. Soil impacts were identified near the depth of the water table. Constituents detected above Indiana RISC residential closure levels included lead, naphthalene, and TPH. Boos recommended that a FSI be undertaken to assess the extent of soil and groundwater nant migration away from the former location of the UST. Recommendations include illation of five additional monitoring wells and additional soil and groundwater sampling. IDEM �eviewed the Weaver Boos ISC, concurred with the recommendation to proceed with a FSI, an provided the following additional comments via letter, dated June 27, 2010. One additional monitoring well should be installed to delineate the benzo(a)pyr•ene in the groundwater.