Agmt17 AECOM Technical Services, Inc.

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AECOM will develop a detailed investigation work plan for the potential properties to enter in the ROW. The review and approval by the City and Caltrans will be based on a statistical sampling approach to accomplish the following: • Investigate soils on the properties to come into the Caltrans ROW that will be subject to construction and to allow segregation of soils as needed, to minimize hazardous waste soil disposal and 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. This will extend our analytical testing schedule by the normal lab turnaround time of 5-10 days. • Investigate deeper soils where bent, signage, or sound wall foundations will be installed, if any. • Investigate groundwater in areas where deeper excavation may require groundwater dewatering and disposal, if any. 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 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 in soil off -haul, if needed and if sufficient data are collected. • 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. • Description and figures of the sampling locations, depths of samples to be collected, frequency of sampling, and other procedures, such as use of Terra Cores® for sampling for volatile compounds. • Description of the analytical procedures to be used. • Detailed sampling and analysis table to facilitate the field efforts and to minimize the potential for field errors. AECOM will implement the approved work plan as follows: • AECOM will use the Site-specific Project Health and Safety Plan for its fieldwork. Page 26 of 73 REV: 07-18-17 PR ATTY/AGR.2017.166/AECOM 101/84 PS&E