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�• �y���- <br /> � <br /> . 5 <br /> In addition to increased prices, the decision to prepurchase was also prompted <br /> by a possible scarcity of this material. <br /> An additional factor is the contingency a bidding Contractor may add for these <br /> materials at bid time due to the uncertainty in price and delivery. Finally, <br /> prepurchasing reduces the markup Contractors will add to their bids since they <br /> will not be purchasing the steel directly. <br /> 3.2 Lead Time for Delivery <br /> The supplier for the SBSA sheet piling required a four (4) month lead time. <br /> Quotations for new steel sheet piling are nominally written for approximately a 90 <br /> day delivery lead time. <br /> SBSA desired to put the cofferdam in place during the fall/winter of 2004 in <br /> advance of the 2005 dry weather season when the actual repair/replacement will <br /> take place. If left to procurement by the successful bidder the cofferdam work <br /> would not start until 90 to 120 days after the Notice to Proceed (NTP). SBSA <br /> desired to eliminate the potential for a project delay by prepurchasing. <br /> The same concerns exist for the Recycled Storage Tank Project. A delay in <br /> delivery translates into a delay to Project completion. There is a three month lag <br /> between delivery of the storage tank sheet piles and the sheet pile bracing, which <br /> provides some flexibility in the decision to prepurchase the steel bracing. <br /> However, the decision to prepurchase the sheet piling is more immediate. The <br /> current schedule indicates a prepurchase sheet pile delivery date of January 1, <br /> 2005, and the driving of sheet piles to commence February 1, 2005. The delivery <br /> of steel bracing would be March 1, 2005. If there is no prepurchase of the sheet <br /> piling the sheet pile delivery schedule will slip to May 1, 2005. Consequently, <br /> the Project completion will be delayed from April 1, 2006 to July 1, 2006. <br /> 3.3 Design Considerations <br /> SBSA desired to provide the bidders with a cofferdam/trestle scheme that would <br /> work rather than rely upon the Contractor for the design. In addition to <br /> shortening the construction duration (via the design/submittal/approval process), <br /> it also served to eliminate the possibility that an overaggressive bidder would not <br /> take into account all the complex variables surrounding the Effluent OutFall <br /> Repair/Replacement Project, and the requirements of the cofferdam/trestle <br /> arrangement. <br /> These same parameters are present for the Recycled Water Storage Tank <br /> Project, which is a considerably more complex design. The structure is more <br /> complicated due to its proximity to the existing plant, and the considerable <br /> excavation depth, which necessitates longer pile sheets. Further, the deeper <br /> excavation requires extensive bracing that have longer spans. This is <br /> Page 3 of 4 <br />