FINAL SITE INSPECTION REPORT

1002100310041005100610071008100910101011101210131014101510161017101810191020102110221023102410251026102710281029103010311032103310341035 The unfenced area is frequented by farm workers; the general public does not haveroutine access to the AOC.5.4 Munitions Constituents EvaluationPotential MC include metals associated with steel, sheet metal, paint, and other components ofmunitions (chromium, copper, iron, lead, molybdenum, and nickel), black powder (potassiumnitrate, sulfur, and charcoal), thermite (powdered aluminum and ferric oxide), ballistite(nitrocellulose and nitroglycerine), and Amatol (ammonium nitrate and 2,4,6-trinitrotoluene[TNT]), and tetryl. Perchlorate was not identified as a potential MC at Target No. 2.Nonetheless, discussion of perchlorate analytical results from surface water samples collectedfrom Target No. 2 during the PA/SI is included in the following evaluation for completeness.5.4.1 Terrestrial PathwayTerrestrial receptors may be exposed to MC because soil may have been directly affected by thecorrosion of metals from the bomb bodies or explosives used. Two surface soil samples (NWO-030-0002 and NWO-030-0003) were proposed and collected at Target No. 2. The samplelocations are shown on Figures 5-2 and 5-3. The samples were analyzed for select metals(aluminum, chromium, copper, iron, lead, molybdenum, and nickel) by EPA Method 6020A. Inaddition, samples were analyzed for aluminum and manganese for potential use in evaluatingnaturally occurring concentrations of metals in soil using the method of Myers and Thorbjornsen(2004). The samples were also analyzed for explosives including nitroglycerin by EPA Method8330A.Two surface soil samples (0 to 0.5 ft bgs) (SS-PS003 and SS-PS005) and two subsurface soilsamples (0.5 to 2.0 ft bgs) (SB-PS003 and SB-PS005) were collected during the PA/SI (Weston,2004). Samples were analyzed for TAL metals using CLP SOW ILM05.3 (EPA, 2004) andperchlorate using EPA Method 314.0 (EPA, 2000) (Table 2-3). The PA/SI sample locationswere located north of the Target No. 2 AOC boundary, but are included in this evaluation forcompleteness.5.4.1.1 Comparison to Background DataThe detected metals concentrations in soil for both the SI samples and the PA/SI samples arelisted on Table 5-1. There were no exceedances of the SI background soil concentrations in anysample. There were no explosive or perchlorate detections in either the SI or PA/SI samples.5.4.1.2 Comparison to Human Health Screening ValuesSoil analytical results are only compared to human health screening values if backgroundconcentrations are exceeded. Because there were no exceedances of background concentrations,no comparison has been completed for this SI.Boardman AFR Final SI Report.doc 5-3 Contract No. W912DY-04-D-0010 Delivery Order No. 003September 2007