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REQUIREMENTS FOR CONSTRUCTION OF VADOSE <br /> AND GROUNDWATER MONITORING WELLS <br /> GENERAL <br /> 1. Drill rigs are inspected by the operator prior to drilling to assure the rig is free of hydraulic <br /> fluid or oil leaks. <br /> 2. Prior to drilling any boring, the drill rig is cleaned by an approved method to ensure that <br /> there is no contamination introduced by drilling and/or cross-contamination. <br /> 3. Drilling is performed with a hollow-stem continuous flight auger drill rig. No drilling fluids <br /> can be used unless approved prior to drilling or otherwise specified. <br /> 4. Any drilling fluid additives shall be limited to inorganic, non-hazardous materials which <br /> . will not mask or after the constituents being monitored. Use of all additives must be <br /> indicated on the boring log as to depth, quantity, and type. Representative samples of the <br /> additive shall be retained for a period of 90 days. <br /> S. Soil sampling equipment, drilling equipment, and materials used to construct a well must <br /> be compatible with contaminants expected and shall not donate, capture, mask, or alter <br /> the constituents to be analyzed. <br /> 6. Prior to installation (same day) all well casings, casing fittings, screen, and all other <br /> components to be installed In the well are thoroughly cleaned by an approved method <br /> such as steam cleaning Cleaning Is not necessary for factory cleaned and wrapped <br /> materials. <br /> 7. The well heads are provided with water tight security structures and adequate well <br /> protection to prevent entry of surface water, accidental damage, unauthorized access, <br /> and vandalism. <br />