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• DDJC-Sharpe Work Plan-Demolition o4uilding 137,Closure of lVell 2 demolition of the concrete foundation that is part • During grout placement,necessary of Building 137, including the removal and injection pressure will be calculated to disposal of the concrete material. achieve an effective seal, using specific gravity of the grout mixture and 2.8 Using a slurry mix,Radian and Gregg hydrostatic head of the grout colo Drilling field crews will pressure grout Well 2 The amount of pressure applied der ends through screened intervals; any excess water that on the characteristics of the cement is produced during grouting will be slurry, slot size of the well screen, containerized. It is assumed that the displaced characteristics of the filter pack and water in the well will be used in conjunction formation, temperature,and well depth with the slurry mix design. Any well water (maximum pressure is approximate y displaced by grouting that has a pH 1 pound per square inch per foot be ow measurement of 7.8 or greater will be contained grade). in drums. All drummed water will be disposed at the on-depot groundwater treatment plant. . After the well casing has been back tlled with grout, the protective casing wi I be 2.9 Grouting procedures will include the removed and the well casing cut off at following: least 2 feet below grade and removed. Additional grout will continue to be • Well-abandonment procedures will added to the casing if any settlemen adhere to requirements set forth in occurs. Bulletin 74-90, California Well Standards(Department of Water . Representatives of the SJCEHD wil be Resources). notified at least 48 hours in advance of the start of well abandonment to allow • The slurry mix (i.e., grout) will consist time for a field inspection. of a mixture of Type II Portland cement, or equiv®lent(e.g.,Micro Matrix . Following well abandonment, a We Cement or Pozmix ), with 3 pounds of Completion Report(Form DWR 18 8) powdered nonbeneficiated bentonite and describing the well destruction will be 7 gallons of water per 94-pound sack of submitted to the State of California cement; grout materials will be weighed Department of Water Resources. The with a mud scale and metered for the report will be signed by a representative appropriate water-to-cement ratio(slurry of the drilling contractor performing the weight of approximately 16 pounds per abandonment. gallon). An accelerant will be used if needed,based on site conditions. 2.10 A video log of construction activities, including well closure, will be available upo • The consistency of the grout will be project completion. Radian will also provide a sufficient to flow through the well supplementary written log corresponding wi screen and into the filter pack. the video log. In addition,photographs of the field activities will be taken. Daily Field Reports • The volume of required plugging will also be completed for distribution to material will be calculated prior to grout CEHNC and DDJC during the field activities. mixing,taking into consideration casing diameter, well depth, and applicable loss 2.11 All work activities performed as part of of material to the formation. Well the well-abandonment and pumphouse construction details are included in demolition effort will be documented in the attachment 2. Verification will ensure comprehensive TO 27 Engineering Technica that the volume of sealant equals or Memorandum. exceeds the volume of the casing. WELL2-WPAd 3 7 September 1999