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Former ARCO Service Station No. 5� S E C O R Work Plan for Well Destruction March 12, 2008 Page 3 groundwater monitoring well (MW- 10) . The soil samples had no detections above the laboratory method reporting limits. The site has been sampled quarterly since February 1995. PROPOSED SCOPE OF WORK The proposed scope of work for this work plan includes destroying one groundwater monitoring well (MW-3) . Details for the activities associated with the completion of the scope of work are provided below. Site 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 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 Prior to beginning field work, all necessary permits will be obtained . Well Destruction The destruction of well MW-3 will be supervised by Stratus. A licensed drilling company will complete the well destruction work following the California Well Standards bulletin 74-90 Part III , Section 19 and 23 and San Joaquin County Well Standards Section 13. 17 . MW-3 will be destroyed by removing all of the well contents via over-drilling the borehole to a total depth of 63 ft, then backfilling the borehole to three ft bgs with neat cement using a tremie pipe system forming a mushroom grout cap/surface seal . Groundwater expelled from the well during the grouting process will be properly contained , characterized , and disposed of. After the sealing operation , the borehole shall be backfilled with clean , native soil . The former well will be capped with appropriate materials to match existing grade. Well construction details can be found in Table 1 . The boring log for MW-3 is presented in Attachment B. REPORTING A letter summarizing the well destruction and soil disposal activities will be prepared and submitted to the California Regional Water Quality Control Board and the SJC/EHD. The letter will include copies of the well destruction permit. In addition , this report will be uploaded into Geotracker. SCHEDULE SECOR is prepared to initiate field activities upon approval of this work plan by the SJC/EHD . SECOR anticipates that the drilling portion of the fieldwork will require approximately four to six 548 Work Plan for Well Oestruction.doc SECOR Intemationa/ Incorporated