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AOC Work Plans <br /> hydrocarbons were detected in one sample at the elevated concentration of 7,900 mg/kg but were <br /> not detected in a second sample collected approximately three feet closer t the ditch. Kleinfelder <br /> indicated that the contamination detected was not significant because of th type of hydrocarbons <br /> (pitch and light oil). <br /> Drain Sump North of the 44x120 Storage Building <br /> Kleinfelder reported that a sump located north of the 44xl20 Storage Building was a collection <br /> point for surface and wash down water in this area and that hydrocarbons ivere the potential <br /> concern. Total hydrocarbons were not detected above reporting limits in one sediment sample <br /> collected from the bottom of the sump. <br /> In December 2001,AGE installed a boring(PB-10)in the vicinity of the x120 Storage Building <br /> sump and collected a grab groundwater sample from the boring. The saml le was analyzed for <br /> TPHg,TPHd,TPHmo, and formaldehyde. With the exception of formald hyde,detected at a <br /> concentration of 110 µg/L,none of the requested compounds were detecte 1. The detected <br /> formaldehyde,is just above the DHS action level of 100 gg/L. <br /> Data Gaps <br /> Data Gaps for the five locations are as follows: <br /> • Ray Bond Building—This area was likely used to wash down motori d equipment. No <br /> documentation exists to confirm if surface soil samples collected in th vicinity of the Ray <br /> Bond Building were analyzed for TPH. Soil samples should be collet ed and analyzed for <br /> TPH to assess potential TPH impacts to soil. Groundwater samples c llected and analyzed for <br /> TPH in other wash indicate it is unlikely TPH has impacted groundwa in the wash down <br /> areas. <br /> Draft <br /> KB61125 workplan-ESC MACTEC Engineering and Consulting, Inc. 45 <br /> September 28,2005 <br />