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SOP No. 5.0 Monitoring Well Installation <br />construction and log details of the procedure. Activities will be conducted in conformance with <br />the Project Health and Safety Plan. <br />5.1 MAINTENANCE OF DRILL RIG EQUIPMENT AND WELL MATERIALS <br />Decontamination procedures specified in SOP No. 10.0 (Decontamination Methods) will be <br />performed. <br />Drill rig injection and water pumps will be cleaned as necessary. <br />Any leaks from the drill rig occurring during well installation will be fixed or contained in such a <br />way that they will not contaminate the borehole. <br />Care will be taken not to contaminate the well casing or the borehole with diesel fluid, hydraulic <br />fluid, WD -40, oil, dirty tools, and so forth. <br />Drillers will use gloves when handling downhole equipment. Different gloves will be used for <br />perforrning activities such as fueling, adding oil, and working on equipment. <br />As defined in 20.6.2 NMAC, pipe lubricants that are used should not introduce contaminants into <br />the borehole. Lubricants that are environmentally acceptable include but are not limited to: <br />Green Stuff®; King Stuff®; vegetable oil; CriscoT "f; and some TeflonT"M -based lubricants. <br />Lubricants that are not acceptable include petroleum -based and most metal -based lubricants. The <br />Project Manager, Field Geologist, or the Environmental Staff will pre - approve lubricants that <br />will be used. <br />All well casing and screen will be free of foreign material. Casing and screen will be stored off <br />the ground in the original manufacturer's shipping containers until they are installed in the <br />borehole. Before installation, well casing, screen, and centralizers will be certified clean from <br />the manufacturer or will be decontaminated according to SOP No. 10.0, Decontamination <br />Methods. Acid rinse solutions should not be used for PVC decontamination. Clean gloves will <br />be worn when handling the well materials. <br />5.2 MONITORING WELL DESIGN AND COMPLETION <br />Procedures for installing three types of monitoring wells are presented in this section: water table <br />wells in unconsolidated materials; water table wells in bedrock; and deep bedrock wells below <br />the water table. <br />5.2.1 General Well Installation Procedures <br />Monitoring wells will be constructed in open boreholes or through the hollow stem augers or <br />surface casing, depending on the stability of the borehole and materials encountered during <br />drilling (ASTM 1996, EPA 1990). <br />For boreholes that may need to be backfilled to a certain depth before well installation, drilling <br />mud and /or cuttings will be added to fill the borehole to the depth desired for well installation. <br />7/28/08 5-3 R Incorporated <br />