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ti , 2oo9ocooo Exhibit "B" Not"rfication of Hazardous Substance Storage, Re{ease, or Disposal Tract 32 Nam® of Wazardaus Rata of Property Sutrstance(s) Storage, Remsdial Actions Description Stored (S), Release, or Released (R), ar bisposal pis sect D Tt'aGt 3~ 2,4,6-trinitrotoluene ~ ~~..¢j There were no ammunition plant producgpn operations an this, pproximately (2.4.frTNT) .) 9~a57 parcel. The Gravel and Ciay Pit Area is located outside the The 1980 4 and t4 the southeast d Li f f L 14tS 1~ ass Polynuciear . ne enoe o ea perimeter of land aromatic ~ ~~7$-~~ Instailatian Assessment indicated that this area had historically hydrpcarbons t7sen used far clay and ban'ow adivif;es as well as far the (PAHs) Explosive disposal of oonstrudion debris and ether trash. {R) contamination is believed to Extensive soil sampling was conducted in the Gravel and Clay have originat~i Pit Area during environments! investigations conducted at in the load CHAAP. Soil sample resuEts revealed one detedian of 2,4,6- tines. The TNT (4.7 l.rg/g at 10.5 feet bgs) at IRA 5i~ 25. Removal of this means by 2,4,6-TtJ'f was completed during the 't 994 interim removal which 2,4,6- action where the lacativn was excavated to a depth of 11 feet TNT was bgs and the site was baddi!!ed with dean soil. Confirrnafian released in the soil sampling was conducted at the Gravel and Clay PR area Gravel and during the activities for the 1996 RI. No chemicals of potential Clay Pit Area is concern (COPCs) were detected above industrial risk-based unknown, cleanup levels. Sail samples, however, revealed PAHs could ooncentratiarrs of polynudear aromatic hydrocarbons {PAHs) in have been site soils above residential U.S. Environmental Protection released from Agency (EPA) Region 3 Risk Based Cvnosntratians (Rt3Cs). disposal of All concentrations of PAHs were below the Nebraska crankcase oil Department of Environmental Quality (NplwQ} guidance and other cleanup concentration of 33 Nglg, which was established as the trash- Remedial Action pt~ec4ive (RAO) for PAHs in the OU4 ROD. Because the established RAO far PAHs was not exceeded, no cleanup of PAH-vantaminated soil was required. There was no evidence of plant operations on Tract 32 other than the disposal and txxrow adivlties that acaurred in the Gravel and Clay Pit Area. No soil sampiin9 outside of the Gravel and Ciay Pit Areaway conducted on Tract 32. Environmental snit remediation activities for Tract 32 have been completed. Groundwater contamination consisting of explosive chemicals was detected on Tract 32 in the past: however this contaminafwn did net exceed establ'~shed groundwater cleanup standards after 1985 and no chemicals were detected after 2004. No cleanup of groundwater on Tract 32 is required, although annual monitoring of groundwater conkinues. sbestos (©) Unknown Na asbestos~ontaining materials are known to be present on Trod 32 except far buried lines or pipes that may extend onto Tract 32 from Laad Line 4 and which may contain asbestos or have asbestos insulation. Mast of the utilities excavated an • Load Line 4 were located at de ths of 4 to 8 feet s.