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v NOV <br /> Section 10-1 Construction Details <br /> Std_ Spec_ Sec. 70 <br /> Special S1 <br /> Page 6 0£ 8 <br /> upward_ Maintain the bottom of the tremie pipe below the <br /> top of the cement to prevent free fall and bridging. <br /> M_ when using drive-casing techniques, raise the drive casing <br /> in incremental intervals, keeping the bottom of the drive <br /> casing below the top of. the cement. Cease grouting when the. <br /> cement level has risen to the depth directed by Engineer_ <br /> Monitor cement levels to assure that cement flowing into the- <br /> formation <br /> heformation is replaced by additional cement- If settling of <br /> the cement occurs, top off the cement seal_ <br /> N. The Contractor shall provide the following information to <br /> the Engineer: <br /> I- Depth of all encountered water-bearing. zones <br /> 2. Total depth of bore hole <br /> 3. Depth from ground surface to top and bottom of all grout <br /> or bentonite interval <br /> 4_ Depth from ground surface to top and bottom of all sand <br /> pack intervals <br /> 5_ Depth from ground surface to top and .bottom of well <br /> screen interval <br /> 6_. Height above the ground surface of the top of the PVC <br /> well casing <br /> 7- Height above the ground surface of the top of the steel <br /> protective casing <br /> WELL DEVELOPMENT: <br /> A_ wait 24 hours after well installation prior to well" <br /> development_ Sound the depth to the bottom of the well, and <br /> if-sand--or sediment are present inside-the well,- remove it <br /> by bailing_ <br /> B_ Develop the well using a combination of bailing, surging, <br /> and pumping techniques. <br /> C_ Begin development by first gently surging followed by <br /> bailing or pumping_ Continue with alternate surging and <br /> bailing or pumping_ At no time shall the surge block be <br /> forced down the well if excessive resistance is encountered- <br /> Do not allow the bailer to free-fall or descend rapidly such `% <br />