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a Clayton Group Servic Page 3 of 4 Standard Operating Procedures SOP-10 - Destruction of Monitoring Wells These derived volumes are minimum volumes required owing to the possible loss of plugging material into the subsurface formations. 7. The grout (typically bentonite slurry) is placed slowly through a grout pipe (tremie pipe) filling the hole from the bottom up until the grout reaches the surface. The grout level may drop after several hours, and additional grout may be required. 8. Measure the volume of plugging material that has been placed in the hole (from the drillers), and verify that at least the minimum amount (equal or greater than the volume of the boring) has been placed in the borehole. 9. In many areas, the upper 5 feet of the boring will be filled with bentonite cement to provide a solid surface seal and cover. Destruction by Filling the Casing - 1. Obtain the required well abandonment permit. 2. Prepare a "Health and Safety Plan". 3. Review the well construction details and conduct a down -hole inspection, generally by measuring the well depth, to determine if bridging or other interferences are present in the casing, conducting well remediation if interferences are present. 4. Once on site, conduct a "tail -gate meeting" to review the scope of work and Health and Safety Plan with drillers and any other personnel present.. 5. Calculate the volume of the inside of the casing. Typically at least 1.2 times the casing volume of sealing material can be placed within the casing to assure adequate sealing. The volume of casing can be calculated by the equation: V = r xDx7.481 Where: r = radius of casing in feet D = depth of casing in feet V = volume of casing in gallons or For 2 -inch casing: V = 0.17Ga1/Linear Ft. x D For 4 -inch casing: V = 0.66Gal/Linear Ft. x D S:Ermr\ProjASOPS\SOP-l0.doc