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REV: 08-14-25 LF Consultant shall collect a soil vapor sample from each soil vapor well, including at least one duplicate sample. Consultant shall analyze soil vapor samples for Volatile Organic Compounds by U.S. Environmental Protection Agency (EPA) Method TO-15 and fixed gasses (including the leak check tracer helium, oxygen, nitrogen, methane, and carbon dioxide) by ASTM International 1946-90. Task 3.4 – Soil Vapor Investigation Reporting Consultant shall draft a report describing the field activities, analytical methods, results, and recommended next steps. Consultant shall provide the draft for City review and incorporate City feedback to create a final report to submit to the RWQCB. Once submitted, as requested by the City, Consultant shall assist with any questions or requests from the RWQCB regarding the submitted report. Consultant shall sign the report with the appropriate professionally licensed staff and shall upload to GeoTracker in accordance with regulatory requirements. Task 4 – As-Needed Groundwater Monitoring Services If requested by the City, the Consultant shall conduct as-needed groundwater monitoring services for the site for up to 20 quarters. At this time, the RWQCB requires the gauging of 22 groundwater monitoring wells, which includes one offsite well installed in a City parking lot located near the intersection of Jefferson Avenue and Middlefield Road, and the sampling of 16 groundwater monitoring wells. Consultant shall continue to analyze the approved wells and the same compounds and other data that have been reported to the RWQCB for the most recently conducted groundwater monitoring event for the site, unless otherwise requested by the City. Consultant shall also perform groundwater monitoring events on a quarterly basis unless otherwise requested by the City. Subtask 4.1 - Task Management & Field Preparation Consultant shall manage and plan the groundwater monitoring activities and coordinate with the City and property owners to schedule monitoring events in advance, which shall include scheduling the subcontractors, notifying the City and property owners, coordinating access, coordinating laboratory testing, and placing, if needed, no parking signs in the parking areas prior to initiating the work. Consultant shall also coordinate with the chemical testing laboratory by obtaining sampling equipment from the laboratory and shipping and analyzing samples. Subtask 4.2 - Well Gauging & Groundwater Sampling Consultant shall measure depth to groundwater and purge and sample water from all accessible monitoring wells required by the RWQCB, which includes: Gauging and sampling all accessible wells Measuring pH, temperature, electrical conductivity, and turbidity until the measurements are stable Collecting a groundwater sample from accessible wells using low-flow sampling procedure with a peristaltic pump and dedicated tubing Placing purge water in drums and coordinating proper disposal ATTY/AGR.2025.210/Farallon Consulting, LLC (Soil vapor investigation & groundwater sampling) (Page 14 of 19)