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DATA GAP ASSESSMENT WORK PLAN Stockton Charter Way Commingled Plume July 30, 2014 3.0 Well Decommissioning 3.1 SITE-SPECIFIC HEALTH AND SAFETY PLAN As required by the Occupational Health and Safety Administration(OSHA)"Hazardous Waste Operations and Emergency Response" guidelines (29 CFR 1910.12o) and by California Occupational Health and Safety Administration (Cal-OSHA) "Hazardous Waste Operations and Emergency Response" guidelines (CCR Title 8, Section 5192),the contractor will prepare a site-specific Health and Safety Plan(HASP). At a minimum,the HASP will define the proposed subsurface investigation activities, describe physical and chemical hazards that may be associated with the work, provide a map to the nearest emergency medical facility, and include material safety data sheets for hazardous chemicals that will be used or produced during the work. A copy of the HASP will be available on-site at all times during field work. The field staff and subcontractors performing field activities will review the HASP prior to beginning field operations,as described in this work plan,at the Site. 3.2 Permitting Prior to performing the well decommissioning activities, necessary permits will be obtained from the SJCEHD. 3.3 Preliminary Field Activities Well locations will be marked or cleared of underground facilities prior to decommissioning. As required by the California Government Code 4216,Underground Service Alert(USA)North will be notified at least two working days before drilling activities. Well locations will be marked with white paint to indicate the area of drilling. This will allow USA North members, including local utility companies, to identify and mark the horizontal path of their underground facilities located within the area of drilling. In conjunction with USA North, a private utility locating company will be utilized for clearing proposed well boring locations for underground utilities. 3.4 Well Decommissioning Prior to decommissioning,the well borings will be air-knifed to approximately 8.1 ft below ground surface (bgs)to investigate that no unidentified underground facilities exist within the area of drilling. A total of 17 groundwater monitoring wells (AMW-1o, AMW-12, CMW-1 through CMW-3, SLMW-1, SLMW-9S/SLMW-7D, SMW-1, SMW-4, SMW-5, SMW-6, SMW-9, SMW-10, SMW-11, SMW-13, and SMW-17)will be decommissioned in accordance with the SJCEHD Well Standards(SJCEHD,2005). Based on SJCEHD requirements, each well will be destroyed by either pressure-grout method or over- drilling. Determination of which method to use will be made by Stantec and SJCEHD collectively, and will take into account accessibility to the well,utility conflicts,and other safety concerns. 6