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Work Plan For Well ARCADES Destructions Chevron Site ID 309075 January 2,2013 3.0 PROPOSED SCOPE OF WORK The monitoring well network consists of seven groundwater monitoring wells (MW-1, MW-2, MW-3, MW-4, MW-5, MW-6, and MW-6D) as shown on Figure 2. Well construction details are included in Table 1. The proposed methodology for the destruction of site related monitoring wells are discussed below. . 3.1 SITE SPECIFIC HASP I As required by the Occupational Health and Safety Administration (OSHA) "Hazardous Waste Operations and Emergency Response" guidelines (29 Code of Federal Regulations Section 1910.120), and by California Occupational Health and Safety Administration (Cal-OSHA) "Hazardous Waste Operations and Emergency Response" guidelines (California Code of Regulations Title 8, Section 5192), ARCADIS will prepare a health and safety plan (HASP) prior to commencement of fieldwork. Field staff and contractors will review the HASP before beginning field operations at the site. 3.2 PERMITTING Applicable permits will be obtained from the City of Stockton and SJCEHD as necessary, prior to commencing field activities. 3.3 UNDERGROUND UTILITY LOCATING Underground Service Alert (USA) will be notified a minimum of 48 hours before beginning any evasive operations (i.e. drilling, etc) to identify any public utilities in the vicinity of the proposed 1. well destruction locations. In conjunction with the USA, private utility locate and ground penetrating radar (GPR) activities'will be completed to further evaluate underground utilities. 3.4 WELL DESTRUCTION ACTIVITIES 3.4.1 Complete Over Drill Monitoring wells MW-1, MW-2, MW-3, MW-4, MW-5, and MW-6 will be destroyed by removing the well box and over drilling with 10-inch outside diameter (OD) hollow stem augers (HSA) to total completion depth to remove all material (e.g. casing, filter pack, annular seal, etc.) associated with the well. The boring will then be grouted from the bottom of the borehole to within 3 feet of ground surface using a tremie pipe and cement-bentonite grout. The upper 3 feet will be backfilled with native soil to the surface of the borehole and then completed at grade with material matching the existing surface (e.g. asphalt.concrete, etc). G:Wproject\ENV\CHEVRON\309075\6 Deliverables\Work Plan\Well Destruction\309075 Work Plan for Well Destructions FNL 01022013.doc 2 'i .