ARCHIVED REPORTS_2019 SOIL MGMT PLAN (JULY-REVISED)

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EKI B90047.00 Page 10 Former Pilkington North America Site Lathrop, California leaving the Site. When construction activities are performed below the elevations in which chemically-impacted soil remains in the chemically-impacted areas on the Site (shown on Figure 1-2), construction equipment and transportation vehicles leaving such areas will be decontaminated using methods including brushing and/or vacuuming to remove loose dirt on vehicle exteriors and wheels. If these dry decontamination methods are inadequate, methods such as steam cleaning, high-pressure washing, and cleaning solutions may be used, as necessary, to thoroughly remove accumulated dirt and other materials. Liquids used for equipment and vehicle decontamination will be contained and appropriately disposed of. When construction equipment and transportation vehicles leave the Site, the equipment and transportation vehicles will be decontaminated using methods similar to those identified above, as needed to minimize tracking of dirt onto roadways. Storm Water Pollution Prevention Controls A Storm Water Pollution Prevention Plan ("SWPPP”) was prepared for the Site by Kier & Wright Civil Engineers & Surveyors, dated 4 February 2019, and is provided as Appendix I. Contractor shall follow all SWPPP requirements and implement best management practices in accordance with the Site SWPPP (Kier & Wright, 2019). Should rainfall occur during earthwork activities at the Site, the contractor will immediately implement storm water pollution controls to minimize storm water runoff from exposed soil on the Site and to prevent sediment from leaving the Site. When construction on the Site will simultaneously disturb more than 1 acre of soil, site owner and its contractors will follow the requirements of the State Water Resources Control Board (“SWRCB”) General Permit for Discharges of Storm Water Associated with Construction Activity Construction (General Permit Order 2009-0009-DWQ, effective 1 July 2010). The General Permit requirements include filing a Notice of Intent form with the SWRCB and development of a SWPPP by a certified Qualified SWPPP Developer (“QSD”). As noted above, a Site SWPPP has been prepared by Kier and Wright (2019). For construction on the Site that will disturb less than 1 acre of soil, storm water pollution controls will conform to the City of Lathrop and San Joaquin County requirements. Submittal of an Erosion and Sediment Control Plan (“ESCP”) Worksheet or ESCP Specification sheet within the improvement plans is required for the City of Lathrop. 2.2 Management of Previously Unknown Waste Pits Procedures to be followed if previously unknown waste pits (e.g. similar to the North and South Waste Cells on Parcel B) are encountered as part of ongoing and future Site redevelopment are described below and shown on Figure 2-1. For reference, field photographs of waste material that was encountered during the investigation of the North and South Waste Cells on Parcel B