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k'9 KLEINFELDER <br /> 7 CONCLUSIONS AND RECOMMENDATIONS <br /> Based on the results of the subsurface assessment, Kleinfelder has the following conclusions and <br /> recommendations: <br /> 1. Concentrations of Unidentified Extractable Hydrocarbons (UEHs) in the lubricating oil <br /> hydrocarbon range (C„ to C40 detected) were detected in the soil from approximately the <br /> upper 8 feet of both boring locations. The soil samples obtained from each boring <br /> appeared to be old fill material. No hydrocarbons were detected in any of the other soil <br /> samples from either soil boring. The concentrations detected were less than or equal to <br /> 62.7 mg/kg (parts per million). <br /> These concentrations are very low, and are well below the frequently used TPH clean-up <br /> level of 100 mg/kg. Furthermore the hydrocarbons detected are relatively immobile. <br /> Therefore, it is Kleinfelder's experience that the concentrations detected are not <br /> anticipated to present a significant risk to human health or the environment. <br /> If the UEHs noted during this investigation are encountered during drilling for piers, <br /> Kleinfelder recommends that the drilling returns be used without any further testing on <br /> sites where they will not impact any surface water body. Additionally, Kleinfelder <br /> recommends that the drilling returns not be used on existing or proposed residential <br /> property. <br /> If the UEHs noted during this investigation are encountered during excavation for the <br /> underpass, Kleinfelder recommends that the excavated soil from the upper 8 feet be used <br /> without any further testing on sites where they will not impact any surface water body. <br /> Additionally, Kleinfelder recommends that the excavated soil from the upper 8 feet not <br /> be used on existing or proposed residential property. All soil below a depth of 8 feet <br /> should be used without restrictions. <br /> This recommendation must be approved by PHS/EHD prior to implementation. <br /> Otherwise the soils may possibly be disposed at an approved disposal facility. <br /> 20-3712-08.EO 1/2018R5 10 Page 13 of 16 <br /> © 1998, Kleinfelder, Inc. July 9, 1998 <br />