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Y Region 5,No Further Action `/ 4, Now 10 October 1996 DRAFT DRAFT DRAFT DRAFT DRAFT. DRAFT DRAFT DRAFT ` zone soil and/or ground water to acceptable levels. Monitoring must demonstrate that natural biodegradation is occurring at a rate sufficient to protect human health and the environment, after �. source abatement has been accomplished, and the vadose zone soil and/or ground water will not be used or needed in the projected time schedule. Y 2. The release or leak has been stopped and source(s) of hydrocarbons in the vadose zone have been removed or permanently contained. Y - "Source(s)" includes non-aqueous phase liquids and any petroleum hydrocarbons and additives in the vadose zone which may be mobile (or could be mobilized) under natural conditions, during construction, or other physical disturbance of the site. The source must be removed and/br contained, to the extent practicable, to prevent further spread of pollutants. 3. Petroleum hydrocarbons remaining in the vadose zone (or surface soils) do not impact or threaten waters of the State. Y For any mobile constituents remaining in the vadose zone, the rate of potential pollutant migration, fluctuating ground water levels and �- the depth of pollutants in the vadose zone must be determined. Using fate and transport modeling, leachability studies, or other verification tools, information must be provided to show that there is no impact or threat to surface or ground water quality. Erosion and surface runoff, which may impact surface waters, are ` prohibited. 4. No significant risk to human health and safety exists or is anticipated following remediation. Risk includes direct physical contact, entry to basements, homes or office buildings and subsurface utilities. i, MANAGEMENT STRATEGY A NFAR letter may be issued when the vadose zone only site conforms to all the above criteria. Changes in land use may require reevaluation of the site conditions and additional remediation measures may be appropriate. The upper soils should be remediated, as appropriate, for current and.anticipated land use(s). Documentation of �. results must be provided in accordance with Appendix B to the Tri-Regional Recommendations.