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Consulting Services Agreement between City of San Leandro and Last revised [06/25/2025] BKF Engineers for Macarthur Superior Roundabout Project Exhibit A – Page 3 of 11 utility potholing has been identified, which can typically support the horizontal and vertical verification of approximately 4-7 PH locations. 5) Soil Testing and Characterization – Although originally excluded, the need for soil testing and characterization is recommended (and possibly needed per Caltrans comments) to manage risks/costs, and support soil export operations, and management of potentially state (or federally) contaminated material. Although the area at Foothill/MacArthur/Superior is generally built-out and capped with impervious materials, we do not know what resides underneath; in fact - Caltrans has commented and alerted BKF that the embankment of I-580 contains Z-2 aerially deposited lead (ADL), and will need to be managed on-site or appropriately disposed of at a certified landfill. Since this project is an export project involving roadway and structural excavation operations, it is highly recommended that soil testing and characterization is conducted to avoid surprises and costly change order; soil characterization findings will be included in the technical specifications, so the bidding contractors are aware and can make plans accordingly for disposal operations and their proposed bids. BKF will coordinate with our hazardous material consultant, Geocon, who will conduct the following services related to Soil Testing and Characterization services: • Prepare Health and Safety Plan. • Prepare sample analysis matrix and sample location map for Client approval. • Assumes no traffic control needed. And estimated 1 day (2 persons) to complete fieldwork. • Does not include encroachment/access permitting - Geocon will work under Encroachment and Access Permits issued to Client. • Phase II PSI Soil Sampling o Field Activities:  Advance borings to 2.5 feet below ground surface.  Collect soil samples per boring o Laboratory Analyses:  soil samples for CAM 17 metals  soil samples for soluble (WET or TCLP) single metal (e.g., lead).  soil samples for TPHg/d/mo  soil samples for SVOCs  soil samples for OC Pesticides  soil samples for PCBs  soil samples for VOCs • Prepare draft Preliminary Site Investigation (PSI) Memo for client review. • Prepare final PSI Report. Since Z-2 ADL material has already been defined/documented by Caltrans, testing will confirm whether the ADL is State or Federally managed, in the event on-site management (burying, capping, or surface placement) is not feasible in City (or Caltrans) R/W and must be off-hauled. Task 2 – 100% PS&E Package