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rr- <br />11 <br />4. Depth from ground surface to top and bottom of the sand pack interval <br />5. Depth from ground surface to top and bottom of the well screen interval <br />6. Depth from ground surface to base of installed well string <br />7. Height above the ground surface of the top of the PVC well casing <br />8. Height above the ground surface of the top of the steel protective casing <br />3.04 WELL DEVELOPMENT <br />A. The Contractor prior to development shall sound the depth to the bottom of the <br />well, and if sand or sediment are present inside the well, it shall first be removed <br />by bailing. The Contractor using a combination of bailing, surging, and pumping <br />techniques shall develop the well. <br />B. The Contractor shall begin development by first gently surging followed by <br />bailing or pumping. This is then continued with alternate surging and bailing or <br />pumping. At no time shall the surge block be forced down the well if excessive <br />resistance is encountered. The bailer shall not be allowed to free -fall or descend <br />rapidly such that it becomes lodged in the casing or damages the end cap on the <br />bottom of the well. <br />C. The discharge water shall be periodically collected and checked by the Contractor <br />for clarity and total settable solids (TSS) with an Imhoff cone. Development is <br />considered complete when the discharge water is relatively clear, the TSS reading <br />is at or below 150 parts per million by weight (0.075 ml of material in the Imhoff <br />cone), and a minimum of three well volumes of water have been removed. For <br />slow recharging wells, development is considered complete upon removal of the <br />minimum of three well volumes. <br />D. The Contractor shall obtain a water level measurement at the completion of the <br />well development process. <br />E. The Contractor shall record the following well development information on the <br />Driller's Log or a separate Well Development Record: <br />1. Method of development <br />2. Volume of water removed <br />3. Water levels (including the time of measurement) <br />4. Physical description of the water (e.g., discoloration, clarity, odor, etc.) and <br />solids removed from the well <br />Corral Hollow EMP Man Rev2Mar 22-07.DOC Page 7o/8 February 28, 2007 <br />