SITE INFORMATION AND CORRESPONDENCE

Home Browse Search

Stantec July 10, 2013 Page 2 of 3 RE: MW-2 Well Destruction Work Plan Olin Chlor Alkali Facility, 26700 South Banta Road, Tracy, California The Site-specific Health and Safety Plan (HASP) will be updated for use by personnel implementing the Work Plan. The HASP will address the proposed activities. A copy of the HASP will be available on-Site at all times. The subcontractor(s) performing the field activities will be provided a copy of the HASP prior to initiating field activities. The on-Site subcontractors will also be required to maintain their own HASP. Task 2 — Monitoring Well Abandonment Well MW-2 is a 4-inch-diameter polyvinyl chloride (PVC) monitoring well with a total depth of 25 feet below ground surface (bgs). A copy of the well construction log is included as an attachment. Well MW-2 will be destroyed by over-drilling using hollow stem augers. Well casing and installation material will be removed by advancing augers to the total depth of the well. Augers will be of equal or greater outside-diameter than those used to install the well to ensure the complete removal of the well material. The resulting borehole will be backfilled with cement-grout slurry through a tremie pipe. The surface completion will be removed and the ground surface will be repaired to match surrounding conditions to the extent possible Well abandonment will be performed by Gregg Drilling and Testing of Martinez, California (C-57 License #485165). Stantec will provide an on-Site geologist to oversee Gregg Drilling and document the well destruction activities. Well abandonment activities will follow applicable guidelines established in the California Department of Water Resources (CDWR) Bulletin 74-81, (1981), and CDWR Bulletin 74-90 (1991). Task 3 — Investigation Derived Waste Disposal Wastes generated during the over-drilling of the monitoring wells will be stored in 55-gallons drums. The drums will remain on-Site pending receipt of analytical data from the laboratory for profiling purposes. The analytical results will be used for waste profiling and disposal evaluation. Task 4— Reporting Documentation of the well abandonment will be submitted as part of the 2013 Semi-Annual Report. Documentation will include a brief written summary, waste profile results, permits, and other pertinent information. State of California Well Completion Reports (DWR Form 188)will be submitted to the California Department of Water Resources. SCHEDULE Stantec proposes to abandon well MW-2 in July 2013. We anticipate that the well abandonment will require approximately one day to complete. One Team.Infinite Solutions. iApioneer\p1oneer-tracy\2013 well abandonment\work plan\well destruction work plan_071013_fnl.docx