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SOP No. 5.0 Monitoring Well Install <br />accurate information, a field geologist or hydrogeologist will be on the site to supervise well <br />construction and log details of the procedure. All activities will be conducted in conformance <br />with the Project Health and Safety Plan. <br />5.1 MAINTENANCE OF DRILL RIG EQUIPMENT AND WELL MATERIALS <br />Decontamination procedures specified in SOP 10.0, Decontamination of Sampling Equipment, <br />will be 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 />performing 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: Green Stuff; King <br />Stuff; vegetable oil; CriscoTM; and some TeflonTM-based lubricants. Lubricants that are not <br />acceptable include petroleum-based and most metal-based lubricants. The Project Manager, <br />Field Geologist, or the Powertech Environmental Staff will pre-approve lubricants that will be <br />used, and the Material Safety Data Sheets (MSDS) for these lubricants will be provided for <br />reference. <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 10.0, Decontamination of <br />Sampling Equipment. Acid rinse solutions should not be used for PVC decontamination. Clean <br />latex or nitrite gloves will 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. Installation of water table wells in unconsolidated material and bedrock is <br />discussed in Section 5.2.2. Monitoring well installation in deeper bedrock borings is described in <br />Section 5.2.3. <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 />7/28/08 Page 3 of 10 R Squared Inc.