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6E � GENESIS ENGINEERING&REDEVELOPMENT • Cost: For phosphate mixing, approximately $30 per yd (for 700 yd total at the Site, approximately $21,000). Excavation and Removal • Effectiveness: Removes all impacted soils, confirmation soil samples will verify that all impacted soil has been removed from the Site. Permanently removes impacted soil from the Site, with no deed or future land use restrictions. • Implementability: Need excavation equipment,trucks to haul soil to landfill, and soil sampling equipment. • Cost: Approximately $60,000 for excavation, hauling, and analytical characterization to dispose of approximately 700 yd of soil. The costs for DTSC oversight are estimated to be $30,000, and includes the Perspective Purchaser Agreement process, oversight of field work, reviewing the RAW report, and certification. 4.2 Evaluation Criteria The remedial goal of this RAW is to remove impacted soils and obtain closure for the Site. The future land use intended by the prospective buyer includes an elementary school. Based on the intended land use, natural attenuation and isolation/stabilization do not meet the remedial goal because: • Natural attenuation would degrade the petroleum hydrocarbons, PCB, and dioxin, but would not break down the metals in the soil; and • Isolation/stabilization also does not remove the impacted soil from the Site. The constituents of concern would be immobilized in the soil,but the constituents of concern still have the ability to become mobile in the soil at a later date. Isolation/stabilization would limit future land use and would not be appropriate if the land is used to build an elementary school. Soil washing is capable of meeting remedial goals. After soil washing,the COPC are concentrated in the fine-grained soils which require off-Site disposal. Since the COPC are concentrated in the fine-grained fraction,waste classification may not meet the non- hazardous criteria resulting in increased disposal costs. In addition, the washing costs are approximately twice those for excavation and disposal. Excavation and off-Site disposal will meet the remedial goal by removing impacted soil followed by sampling to confirm all impacted soils have been excavated. This remedial alternative was chosen because it meets the remedial goal, does so in a timely manner, and is the approximately half the cost of soil washing. Former Gordon Research Company Property 12 of 20 Removal Action Workplan June 2017