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30 July 2018 AdvancedGeo AGE Project No. 18-4357 Environmental Page 2 of 5 abatement of the remaining contamination. This work plan was prepared as required by the SJCEHD letter to investigate and subsequently abate the remaining soil contamination at the site. 3.0. CLEAN UP GOALS The proposed cleanup goals have been selected to protect human health and the environment. Site usage has recently changed from industrial to commercial. There are no plans for the site to ever be used for residential purposes. Clean up goals were selected utilizing currently established environmental screening levels. • Total petroleum hydrocarbons quantified as oil range compounds (TPH-oil) will be evaluated using the established San Francisco Bay RWQCB Environmental Screening Level of 140,000 milligrams per kilogram (mg/kg) for commercial properties. There is no hazardous waste criteria or level directly established for TPH-oil. • Metals and additional analytes will be evaluated using the established USEPA Region 9 Regional Screening Levels (RSLs) for commercial properties; RSLs for metals are listed in Table 1. The commercial RSL for total lead is 320 mg/kg, this value will represent the cleanup goal for total lead. However, the hazardous waste criteria for total lead is 1,000 mg/kg, and the hazardous waste criteria for soluble (STLC) lead is 5 milligrams per liter (mg/1). Therefore, the clean-up goal for soluble lead will be established at 5 mg/l. Therefore, any soil with a value over the cleanup goal for STLC lead will require removal and disposal at a Class I landfill. 4.0. SCOPE OF WORK Based on the data collected from samples S-1 through S-4, only soil in the south-central area of the site in the location of S-1 needs to be excavated and removed. And the lateral and vertical extent of impacted soil in the location of S-1 and surrounding S-1 needs to be assessed and defined. Soil samples collected from S-1 through S-3 did not exceed environmental screening levels or clean-up goals. The proposed scope of work is as follows: • Pre-field work activities. • Soil trenching/potholing and soil sample collection. • Soil excavation and confirmation soil sample collection. • Sample analysis. • Soil disposal of any soil above the cleanup goals, which may be required.