CORRESPONDENCE_1984-1989 - Laserfiche WebLink

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0 0 Well Abandonment Abandoned wells need to be sealed carefully to prevent pollution of the greunowater source and prevent poor -quality water of one saw ifer frog anterin9 another• The following are recommendations by the AWWA which will be followed in abandoning groundwater monitoring wells. Specific well abandonment procedures will be submitted to the Department of aealtn Services for approval before each well is abandoned. Sec. 13.1 General Aoenboned test holes, including test wells, uncompleted wells, and completed welts shall be sealed. Meed for Seating of Wells: 1. Eliminate physical hazard 2. Prevent contamination of groundwater _3,_ Conserve yield_ -and hydrostatic _head o_f aqui era— - s _ - - --�4 . Prevent intermin-gting of de-sirabte sad oni 4 13.1.2 Restoration of geological conditions. The guiding principle to be followed by the contractor in the sealing of abandoned wells is the restoration, as far as feasible of the controlling— geological conditions that existed before the well was drilled or constructed. Sec. 13.2 Sealing Requirements. A well snail be measured for depth before it is seared to ensure freedom from oostructions that may interfere with effective seating operations. 1.3.2. It Liner -pipe removal. Removal of liner pipe from some welts may be necessary to ensure placement of an effective seal. "3,2,2 Exception to removing Liner pipe. if the liner pipe cannot be ensure the prober sealing readily removed, it shall be perforated to required. 13.2.3 Seating materials and placement. Concrete, cement gro::4, or neat cement shalt be used as primary sealing materials and shall be placed from :*.e vc••om upward by ne:1. :hat will avoid segregation or dilution of material. - - - Sec. 13.3 Records of Abandonment Procedures zorple:e accurate recores shall be kept of the entire abandonment procedure to provide detailed records for possible future reference and to demonstrate to the governing state or local agency that the hole was property sealed. '3.3.1 Depths sealed. The depth of each layer of all sealing and backfilling materials shall be recorded. ,3.3.2 ouantity of seating material used. The quantity of sealing materials used shall be recorded. Measurements of static water levels and depths shall be recorded. 13.3.3 Changes recorded. Any changes in the welt made during the plugging, such as perforating lasing, shall be recorded in detail. cReference: AWWA Standard for Water Wet is, AWWA A100-84. Tne American Water Wcrks Association.)