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AOC Work Plans • Millwork Building-This area was likely used to wash down motorized equipment. No documentation exists to confirm if surface soil samples collected in th vicinity of the Millwork Building were analyzed for TPH. Soil samples should be c llected and analyzed for TPH to assess potential TPH impacts to soil. Groundwater samples c llected and analyzed for TPH in other wash indicate it is unlikely TPH has impacted groundwater in the wash down areas. • Priming Building—No documentation exists to confirm if surface soil samples were collected in the vicinity of the Priming Building. Soil samples should be colleci ed to assess potential impacts to soil due to past cleaning practices associated with the Priming Building. Groundwater samples collected and analyzed for TPH in other wash il idicate it is unlikely TPH has impacted groundwater in the wash down areas. • Saw Filing Room-No documentation exists to confirm the actual sarr ple locations of surface soil samples collected in the vicinity of the Saw Filing Room. Soil sai nples should be collected and analyzed for TPH to assess the nature of TPH impacted soil. Groi indwater samples collected and analyzed for TPH in other wash indicate it is unlikely TI 1H has impacted groundwater in the wash down areas. • Drain Sump North of the 44x 120 Storage Building—On the basis of a previous sampling events, there were no data gaps identified for the Drain Sump North o the 44x120 Storage Building.Total hydrocarbons were not detected above reporting limits in a sediment sample collected from the bottom of the sump. This suggests that TPH beark g equipment was not likely cleaned in this area.Petroleum hydrocarbon compounds were n t detected in a groundwater collected from this area. Field Investigation Approach Draft KB61125 workplan-ESC MACTEC Engineering and Consulting, Inc. 46 September 28,2005