Agmt17 AECOM Technical Services, Inc.

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That may pose a risk to site workers and/or the public and may require: 40 -how HAZWOPER trained staff and a dust control plan and implementation. • That will facilitate site grading to allow maximum use of ADL impacted soils on site in accordance with the latest version of the Caltrans/Department of Toxic Substances Control (DTSC) lead in soil variance. • That may require management of some soil as California or federal hazardous waste, if disposed of off-site. AECOM will develop a detailed investigation work plan for review and approval by the CITY and Caltrans that will be based on a statistical sampling approach to accomplish the following: • Investigate soils in the existing Caltrans Right -of -Way within the proposed construction area to allow segregation of soils as needed, to minimize hazardous waste soil disposal, and to maximize use of soils on-site in compliance with Caltrans/DTSC lead in soil variance. Based on the review of geological maps as part of the ISA, naturally occurring asbestos will not be analyzed. Leachability testing with the California Waste Extraction Test (WET) and the Toxicity Characteristic Leaching Procedure (TCLP) will be conducted iteratively based on AECOM's review of the total metals data from the initial analyses. Additional leachate testing will be performed on any sample which exceeds the STLC/TCLP trigger criteria. This additional testing will extend our analytical testing schedule by the normal lab turnaround time of 5-10 additional days, per request. • Investigate deeper soils where bent, signage, or sound wall foundations will be installed. Investigate groundwater in areas where deeper excavation may require groundwater dewatering and disposal. Developed groundwater disposal options include: using the water for dust control, discharging it to the local municipal sewer in compliance with the sewer discharge regulations, and/or discharging it to the local storm sewer in compliance with the applicable National Pollutant Discharge Elimination System permit requirements. • Provide sufficient data to develop statistical Upper Confidence Limits for site contaminants to view the Site soils holistically and to minimize development of hazardous wastes for to be disposed of off-site. • All analyses will be conducted on a normal 5-10 day turnaround time. AECOM's work plan will include the following elements: • Review of the goals of the plan. Page 23 of 73 REV: 07-18-17 PR A1TY/AGR.2017.1661AECOM 101/84 PS&E