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L..r ..d S E C 0 R - Work Plan for Well Abandonment ARCO Service Station No.2133 and Chevron Service Station No.9-4275 Stockton,California Page 2 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 (MSDS) for any hazardous chemicals that will be used or produced during the work. A copy of the HASP will be available onsite at all times during field work. The field staff and contractors performing field activities will review the HASP prior to beginning field operations, as described in this work plan, at the site. Permitting The required monitoring well abandonment permits and encroachment permits for working in the public right of way from City or County (as appropriate) will be obtained from San Joaquin County Environmental Health Department (SJCEHD) and San Joaquin County Department of Public Works (SJPW). Borehole Clearance Activities The required boring abandonment permits will be obtained from the SJCEHD and encroachment permits for working in the public right of way from City or County (as appropriate) of SJPW. All boring locations will be marked with white paint and Underground Service Alert (USA) will be notified at least 48 hours in advance of drilling, to allow the local underground utility companies to identify the location of any utility companies in the area. USA will be notified to identify any public utility alignments that may be in conflict with the wells. In conjunction with the USA, 811 will be notified at least 48 hours in advance of drilling, to allow the local underground utility companies to identify the location of any utilities in the area. 811 calls will be directed to the local One Call Center and the affected utilities, who will then mark underground lines. The new 811 number is a national "Call Before You Dig" phone number designated by the FCC to eliminate the confusion of multiple "Call Before You Dig" numbers and help save lives by minimizing damages to underground utilities. In conjunction with USA and 811, a private utility locating company will be utilized for clearing well locations for underground utilities. Well locations will be cleared by air-knife or hand augered to at least eight feet below ground surface before machine drilling is initiated. Task 2—Groundwater Monitoring Well Abandonment SECOR will supervise a California licensed drilling company to abandon BHD-1, E-7, and E-8, following the California Well Standards bulletin 74-90 Part III, Section 19 and 23 and San Joaquin County Well Standards Section 13.17. The drilling contractor will remove each traffic rated well box and air knife to five feet surrounding the casing. The well will be pressure grouted from total depth to ground surface using neat cement. After pressure grouting the well casing will be backfilled to 3 feet bgs with neat cement using a tremie pipe system forming a mushroom grout cap/surface seal. The former well will be capped with appropriate materials to match existing grade. The well box and casing will be contained and disposed of offsite. Well construction details are included as Table 1. Task 3—Waste Handling and Disposal All investigation derived waste (IDW), including soil cuttings from well abandonment, will be stored onsite in Department of Transportation-approved 55-gallon drums or roll-off bins pending the results of laboratory analyses. Analytical results will be used for waste profiling and disposal. After profiling, IDW will be transported and disposed of at an appropriate State- certified disposal facility. 2133 workplan well abandonment.doc SECOR International Incorporated