Laserfiche WebLink
SOP: Monitoring <br />' Well Development <br />Sfandard Operating Procedure: <br />Monitoring Well Development <br />I. Scope and Application <br />' Monitoring wells (or piezometers, well points, or micro-wells) will be developed to clear them of fine-grained <br />sediment and any drilling fluids that may have been used during well installation, and enhance the hydraulic <br />connection between the well and the surrounding geologic formation. Development will be accomplished by <br />evacuating well water by either pumping or bailing. Prior to pumping or bailing, the screened interval will be <br />gently swged using a surge block, bailer, or inertial pump with surge-block fitting. In addition, sediment <br />accumulated in the bottom of the well will be removed by bailing with abottom-loading bailer. <br />' Pumping methods will be selected based on site-specific geologic conditions, anticipated well yield, water table <br />depth, and groundwater monitoring objectives, and may include one or more of the following: <br />i <br /> <br />II <br />II <br />II <br />II <br />1 <br /> <br /> <br />i~ <br />1. submersible pump; <br />2. inertial pump (WaterraTM pump); <br />3. bladder pump; <br />4. peristaltic pump; and <br />5. centrifugal pump. <br />When developing a well using the pumping method, the pump (or, with inertial pumps, the tubing) is lowered to <br />the screened portion of the well. During purging, the pump or tubing will be moved up and down the screened <br />interval until the well yields relatively cleaz water. <br />Submersible pumps have amotor-driven impeller that pushes the water discharge tubing to the ground surface. <br />Inertial pumps have a check valve at the bottom of stiff tubing which, when operated up and down, lifts water to <br />the ground surface. Bladder pumps have a bottom check valve and a flexible internal bladder that fills from <br />below and is then compressed using pressurized air to force water out the top of the bladder through the <br />dischazge tubing to the ground surface. These three types of pumps have a wide range of applicability in terms <br />of well depth and water depth. Centrifugal and peristaltic pumps use atmospheric pressure to lift water from the <br />well, and therefore can only be practically used where the depth to water is less than 25 feet. <br />II. Personnel Qualifications <br />Field personnel will have current Mine health and safety training. In addition, field sampling personnel will be <br />versed in the relevant SOPS and possess the skills and experience necessary to successfully complete the desired <br />field work. Monitoring well development activities will be performed by persons who have been trained in <br />proper well development procedures under the guidance of an experienced field geologist, engineer, or <br />technician. <br />11/6N6 <br />SOPoS~.fonilor Well flevelopmenl-Mine.EOc <br />i~ <br />