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Section 10-1 Construction Details Std. Spec_ Sec_ 70 Special S1 Page 4 of S place, clean- out or re-drill the borehole before well installation- Dispose of soil cuttings by spreading in a maximum 2-inch thick layer next to drill holes- C_ In the event that the borehole was over-drilled, install well casing to the depth drilled_ Payment for over-drill depth beyond the design depth will not be made. WELL INSTALLATION: A_ Provide Imhoff cone to measure settleable solids_ B_ Request the Engineer to calculate volumes of sand pack, bentonite and neat cement required, based on borehole and well casing dimensions.- C_ Install the casing, screen and other well construction materials in the presence of the Engineer_ Install the PVC pipe, slotted PVC well screen., sand packs, bentonite seal and neat cement seal as indicated on the Plans in the presence of the Engineer_ D_ Connect and carefully lower the well casing assembly to { required depth- I- Attach a casing centralizer at the bottom of the screened interval and just above the screened interval to i assure that the well is centered in the borehole_ s 2_ Suspend the well. casing assembly using the drill rig and do not rest the casing on the bottom of hole_ Extend the top of the well casing above ground surface as shown in the drawings_ - - - - - --- i E_ In the event the well casing assembly is dropped, lowered abruptly, or for any other reason suspected of being damaged during placement, remove the well casing assembly from the borehole for inspection by the Engineer. F_ if. the well casing assembly rises after being placed in the ' borehole due to heaving formation material, do not place any drilling equipment (drill pipe, hammers, etc_) to prevent � ` . the casing from rising- Notify the Engineer of the amount of rise.