ARCHIVED REPORTS_2019 SOIL MGMT PLAN (JULY-REVISED)

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EKI B90047.00 Page 9 Former Pilkington North America Site Lathrop, California 2.0 SUBSURFACE CONSTRUCTION MANAGEMENT PROTOCOLS This section describes protocols to be applied during excavation activities if previously unknown waste pits (e.g. similar to the North and South Waste Cells on Parcel B) or other areas of obvious soil impacts with potentially hazardous materials (e.g. similar to that observed in excavation for utility trench as documented in Attachment 3 Figure 16 to the Order (Appendix A)) are encountered as part of ongoing and future Site redevelopment. 2.1 Construction Impact Mitigation Measures The Contractor will implement the following measures to mitigate potential impacts during subsurface disturbance activities for Site redevelopment in accordance with approved permits and plans from other agencies. Dust Control Contractors will implement dust control mitigation measures during construction activities at the Site to minimize the generation of dust. The type of dust generation that will be mitigated are those associated with excavation activities, truck traffic at the Site, ambient wind traversing stockpiles or debris, and while loading transportation vehicles. Contractors will use the following measures to minimize the generation of dust at the Site during construction: • vehicle speeds on unpaved portions of the property will be limited to 10 miles per hour; • water will be misted or sprayed while performing excavation activities and loading transportation vehicles; water must be applied at a rate that prevents runoff and discharge to the storm drain or surface water bodies; • excavation activities will be controlled to minimize the generation of dust; and • drop heights will be minimized while loading transportation vehicles. Additional dust control measures may be implemented by the contractor, as necessary. Decontamination As stated above in Section 2.0, decontamination protocols described herein are only necessary if vehicles and equipment come into direct contact with soil from previously unknown waste pits or other areas of obvious soil impacts with potentially hazardous waste. In order to prevent or minimize construction equipment from tracking soil with elevated chemical concentrations across or off the Site, construction equipment will be decontaminated prior to leaving previously unknown chemically-impacted areas on the Site and/or prior to