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ekienvironment <br />& water <br />on -Site reuse in engineered fills, mixed -in with concrete and generally used as a construction <br />material. <br />2.4.4 Other Potential On -Site Reuse Soils <br />Soil that is excavated as a result of the circumstances described in this SMP that are not <br />characterized as hazardous waste based on the results of laboratory testing will be evaluated <br />for potential onsite reuse in accordance with procedures described in the WU1 Plan (Appendix <br />B). Removed/stockpiled waste materials that are demonstrated to not pose an unacceptable <br />risk to groundwater quality and meet the soil screening levels in Section 1.4 will be deemed <br />acceptable for onsite reuse in engineered fills in engineered fills, mixed -in with concrete and <br />generally used as a construction material. <br />2.5 Import Fill <br />It is not anticipated that import fill shall be required based on the proposed redevelopment <br />plan. However, if extensive additional remedial excavation is required due to the presence of <br />previously unknown waste pits or visibly contaminated or odorous soil, import fill may be <br />required. If import fill is required, the Contractor will be required to comply with the DTSC <br />Information Advisory Clean Imported Fill Material (see Appendix E) regarding procedures for <br />providing information regarding the source of the fill soils and collecting characterization <br />samples. <br />The basic elements of the guidance to determine acceptable import fill soils are: <br />1. Determining the site use history of the soil source; <br />2. Identifying the potential COCs associated with the identified historical uses or natural <br />characteristics of the soil source; and <br />3. Performing testing of representative soil samples to investigate for the presence of the <br />potential CDCs. <br />Geotechnical/structural products, such as concrete or flowable fill, or top soil will not be <br />considered as import fill. <br />2.6 Personal Protection/Safety Procedures <br />The WU1 Plan stated that the residual solid waste materials at the Site are not known to <br />present a significant chemical exposure threat to Site workers involved with the excavation and <br />materials management plan activities described herein based on previous investigation and <br />characterization data. The WU1 Plan recommended that all agencies, companies, and workers <br />whose activities may result in exposure to residual solid wastes at the subject site (including <br />waste materials and dust) develop health and safety plans specific to the site conditions and <br />