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Project No. D-3885-06 <br />Christ Our Savior Catholic Parish <br />The minimum clear spacing between piles should be twice the widths of the pile, sidewall <br />to sidewall. In case closer spacing is needed for design purposes, a group reduction factor <br />of 0.7 should be applied to total allowable bearing load determined for the entire group of <br />piles at a given location. A group capacity is calculated by multiplying the individual <br />allowable capacity by the number of piles in a group. We recommend grade beams to tie <br />the piles together. The size ofgrade beams should not be less than the pile size. <br />For piles to be driven in close proximity of any utilities or other underground structures <br />(vaults, etc.), a minimum clear distance of 3' or 2 pile diameters / or widths, whichever is <br />greater, should be maintained. <br />Indicator Pile Program: <br />Vibration Monitoring Program: <br />There seem to be no structures close by which may be impacted by vibrations and noise, <br />nevertheless it is recommended for vibration monitoring and noise level, if desired. <br />Vibration levels should comply with USBM zu8507 and OSMRE criteria. Project plans <br />and specifications should be reviewed by this office for further information relevant to <br />I <br />T <br />T <br />I <br />I <br />E <br />t <br />I <br />I <br />T <br />t <br />T <br />I <br />I <br />I <br />I <br />I <br />I <br />u <br />Indicator pile program can be conducted to verifu pile order lengths. This can be done by <br />driving at least 10 piles, using the same equipment as the production piles. Typically, <br />indicator piles would be longer than the anticipated design pile lengths (say 60 to 70 foot <br />long piles) and they would be driven at selected locations of actual production piles, <br />spread out over different areas ofthe site. Such data can be used in verifuing the criteria <br />for production pile lengths, driving energy, seating blow counts, and pile capacity. The <br />indicator pile program can also be accompanied by vibration and sound monitoring and <br />such data can be used in veriffing a suitable sound and vibration monitoring criteria for <br />production pile driving operations. <br />23