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Revised Workplan-Additional Site Investigation for PFAS BSK Project E20-016-01F Stockton Metropolitan Airport(SCK) March 1, 2023 Stockton, California Page 15 6 SCOPE OF WORK 6.1 First Phase of the Investigation 6.1.1 PRE-FIELD ACTIVITIES 6.1.1.1 Permitting Federal Aviation Administration (FAA) Form FAA 7460-1, "Notice of Proposed Construction or Alteration," Obstruction Evaluation/Airport Airspace Analysis (OE/AAA) notices will be submitted to FAA for approval prior to drilling activities. FAA approval of these notices is anticipated to require 60 days or more for approval. Boring/monitoring well permits are required and will be obtained from the San Joaquin County Environmental Health Department. Following the first phase on investigation BSK will discuss placement of the four (4) monitoring wells and vertical delineation borings proposed for the second phase of investigation with the CVRWQCB. Once final locations of borings and wells for the second phase of the investigation have been determined, BSK will submit FAA 7460-1 "Notice of Proposed Construction or Alteration"to the FAA for consideration and approval. 6.1.1.2 Source Water Sampling Prior to field activities, a current water quality source (likely a hydrant and faucet with a City of Stockton municipal water supply) will be sampled and tested to identify an on-Site source of PFAS-free potable water. 6.1.1.3 Health and Safety Plan A Site-Specific Health and Safety Plan (HASP)will be developed prior to field investigative tasks. The HASP will address safety considerations for all proposed work including physical and chemical hazards, monitoring procedures and action levels, site control procedures, accident prevention, emergency procedures and contacts, and a map of the routes to the nearest urgent and emergency care facilities. Subsurface investigation activities will be performed in Level D personal protective equipment. As a safety precaution, a PID will be used to monitor the breathing zone and screen samples for volatile organic compounds (VOCs) during field activities.