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U. 0 <br /> FEB 0 3 1999 <br /> 13.15.2. Mechanical surging devices, such as "plungers", bailers, and surge blocks shall be <br /> operated in such a way as to prevent damage to the well, and without producing <br /> excess sediment, <br /> 13.15.3. The air or gas supply used in development operations shall be flee of hydrocarbons, <br /> and other pollutants or contaminants. Air development and air jetting methods must <br /> obtain prior approval from the Director. <br /> 13.15.4. Water used in jetting operations shall be free of pollutants and contaminants. Water <br /> jetting development methods must obtain prior approval from the Director. <br /> 13.15.5. All equipment used for developing, sampling, and/or repairing of wells must be free <br /> of contamination and cleaned between the construction and/or sampling of wells to <br /> prevent cross contamination. <br /> 13.15.6. A minimum of 12 hours of time shall be allowed between placement of the annular <br /> seal and well development. <br /> 13.15.7. Development and purge water, that is not permitted for discharge to land or sanitary <br /> sewer, shall be containerized in properly secured and labeled DOT drums prior to <br /> disposal in accordance with all applicable federal, state, and local requirements. <br /> 13.16. REHABILITATION AND REPAIR OF MONITORING WELLS <br /> 13.16.1. Rehabilitation methods should be compatible with the use of the monitoring well. <br /> Well rehabilitation methods which include surging by use of compressed air, <br /> backwashing or surging by alternately starting or stopping a pump, water jetting, <br /> sonic cleaning, or combinations of these, must obtain prior approval from the <br /> Director. <br /> 13.16.2. Materials used for repairing well casing shall meet the requirements of Section 13.8. <br /> 13.17. -REQ FOR DESTROYING MONITORING WELLS AND EXPLORATION HOLES <br /> 13.17.1. A monitoring well shall be investigated to determine its condition and details or its <br /> construction prior to its destruction. <br /> 13.17.2. The well shall be sounded immediately before it is destroyed to determine whether <br /> there are obstructions that will interfere with filling and sealing. <br /> 13.17.3. Any obstructions found in the well or boring shall be removed before filling and <br /> sealing operations begin. _ <br /> 13.17.4. If the well was constructed and maintained in accordance with these Standards, the <br /> sealing material shall be placed under pressure to ensure that the monitoring well is <br /> properly filled and sealed. <br /> 13.17.5. Casing material may require perforation, or puncturing, to allow for proper <br /> placement of sealing materials. <br /> 13.17.6. If the well construction is unknown and/or is located in an area of known or <br /> suspected pollution or contamination, the well shall be destroyed by removing all <br /> ..material withinthe.nriginal borehole 4inciuding the well casing, screen, filter pack, <br /> and annular seal); and the created hole filled completely with appropriate sealing <br /> material. <br /> 13.17.7. Exploratory borings, installed for sampling purposes, shall be completely grouted <br /> with appropriate sealing material. The top 3 feet of the boring may be backfilled <br /> with clean, uncontaminated fill material. <br /> 21 <br />