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Prom:STANTEC 9168610421 09/2412 10:51 #386 P.003I004 Stantet Corrective Action Plan Stockton Charter Way Commingled Plume No. CP0057 June 19, 2012 4.0 SYSTEM INSTALLATION SCOPE OF WORK 4.1 WELL INSTALLATION AT CHEVRON FACILITY#92033 The proposed scope of work includes the installation of ten sparge wells (AS-3 through AS-12) and five vapor extraction wells (VE-2 through VE-6) prior remediation system installation. The new wells will be in addition to the existing two sparge wells (AS-1 and AS-2), one vapor extraction well (VE-1), and two piezometers (PZ-1 and PZ-2). The proposed well locations are presented in Figure 2 and will be finalized on-site upon approval based on field conditions. 4.1.1 Preliminary Field Activities Well installation will commence under the access agreement currently in place with the property owner. A schedule of field activities will be communicated to the property owner and tenants a minimum of fourteen days prior to field activities in order to minimize potential disruptions to normal station activities. 4.1.1.1 Permitting Prior to performing the well installation activities, all necessary permits will be obtained from the San Joaquin County Environmental Health Department. 4.1.1.2 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 1910.120) 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 any 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 CAP, at the Chevron Facility#92033- 4.1.1.3 Utility Survey All well locations will be marked or cleared of any underground facilities prior to drilling activities. As required by the California Government Code 4216, Underground Service Alert (USA) North and 811 will be notified at least two working days up to 14 calendar days before any drilling activities. Well locations will be marked with white paint to indicate the area of excavation/drilling. This will allow USA North members, which includes local utility companies, to identify and mark the horizontal path of their underground facilities located within the area of drilling. The area will be cleared if no underground facilities are found. In conjunction with USA Stockton Charter Way Commingled Plume Corrective Action Plan.doc 9