ARCHIVED REPORTS_2019 SOIL MGMT PLAN (JULY-REVISED)

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EKI B90047.00 Page 15 Former Pilkington North America Site Lathrop, California Soil analytical results shall be reported by the California state -certified analytical laboratory on a wet-weight basis. Characterization of Excavated Soil with Surface Glass and Concrete Excavated soil that contains glass cullet but not waste materials of the type documented in the North and South Waste Cells and/or known to contain COC’s, shall be deemed acceptable for on-Site reuse in engineered fills, mixed-in with concrete and generally used as a construction material. The presence or absence of waste material in excavated soil will be determined by field observation and comparison to the field photographs of waste material from the North and South Waste Cells (Appendix J). Other Potential On-Site Reuse Soils Soil that is excavated as a result of the circumstances described in this SMP that are not characterized as hazardous waste based on the results of laboratory testing will be evaluated for potential onsite reuse in accordance with procedures described in Section 6.5 of the EMMP (Appendix C). Removed/stockpiled waste materials that are demonstrated to not pose an unacceptable risk to groundwater quality and meet the soil screening levels in Section 1.4 will be deemed acceptable for onsite reuse in engineered fills in engineered fills, mixed -in with concrete and generally used as a construction material. 2.6 Import Fill It is not anticipated that import fill shall be required based on the proposed redevelopment plan. However, if extensive additional remedial excavation is required due to the presence of previously unknown waste pits or visibly contaminated or odorous soil, import fill may be required. If import fill is required, the Contractor will be required to comply with the DTSC Information Advisory Clean Imported Fill Material (see Appendix K) regarding procedures for providing information regarding the source of the fill soils and collecting characterization samples. The basic elements of the guidance to determine acceptable import fill soils are: 1. Determining the site use history of the soil source; 2. Identifying the potential COCs associated with the identified historical uses or natural characteristics of the soil source; and 3. Performing testing of representative soil samples to investigate for the presence of the potential COCs.