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SOP No. 66.0 Well Development <br />• Stainless steel, adjustable rate, submersible pump, controller, and power source (generator or <br />battery) <br />• Surge block <br />• Teflon® or Teflon-lined polyethylene tubing <br />• Stainless steel or Teflon® bailer <br />• Mechanical reel or truck-mounted wireline rig (for deep wells) <br />• Water quality meters for temperature, conductivity, pH and turbidity <br />• Plastic sheeting <br />• Decontamination equipment and supplies (see SOP No. 10 Decontamination) <br />• Personal protective equipment (PPE) as outlined in the Health and Safety Plan (HSP) <br />• Organic vapor detector (on wells scheduled for volatile organics analysis) <br />• Graduated 5-gallon bucket <br />• Drums or other large container for storing development water <br />• Water-level probe <br />• Weighted tape measure <br />• Calculator <br />• New rope <br />5.0 MONITORING WELL DEVELOPMENT PROCEDURES <br />The initial static water level will also be measured before development begins and well purge <br />volume requirements will be calculated. <br />Monitoring well development will be accomplished using a surge block and/or a bailer and a <br />submersible pump to flush the screen, sand pack material, and borehole wall of drilling fluids <br />and fine sediment resulting from well drilling and installation activities. This procedure also <br />allows for the removal of fine sediment, which may have accumulated within the inner well <br />casing. <br />The surge block will initially be operated with short, gentle strokes above the well screen intake. <br />Development will begin at the static water level and move progressively downward to prevent <br />the surge block from becoming sand locked. The surge energy shall be gradually increased at <br />each depth. Surging shall be alternated with removal of the fines with a pump or bailer. Note <br />that surging of low-permeability formations can result in a collapsed well screen. Development <br />of fine-grained materials will be accomplished by a gentle action to avoid reducing the natural <br />hydraulic conductivity. <br />Well development will begin no sooner than 24 hours after the well as been grouted and will <br />consist of removing approximately 3 to 10 well casing volumes from the well, plus a volume of <br />water equal to any additional potable water added to the borehole during drilling or well <br />8/05/08 Page 2 of 4 R Squared Inc. <br />Attachment A