CLOSED

 TEMPORARY SUPPORT STRUCTURE OF THE GILPIN FALLS COVERED BRIDGE

CECIL COUNTY
DEPARTMENT OF PUBLIC WORKS
CONTRACT BID NO. 08-17

 ADDENDUM #4

 1.  The following addendum is generated as a result of contractors' questions concerning use of concrete support structure.  As a result the following change has been made to Bid 08-17:

             - Section 403, pages TS-6 through TS-8 and supporting drawings refer to temporary support structure as being "…structural steel member and/or timber cribbing."  This shall be changed to add the following: "…and the substructure elements may be constructed of cast-in-place concrete."

 2.  Additionally, the following is a list of final questions received by contractors and responses:

 Q:  Number 3 of Addendum 3 stated a copy of prospective bidders who received a set of the design documents has been enclosed with this addendum.  Where can I find a copy of this document?

 A:  The copy of prospective bidders is listed on the Cecil County Department of Purchasing website at http://www.ccgov.org/dept_purchasing/Bid08_17list.cfm.

 Q:  Number 7 of Addendum 3 states that this project will be similar to that of a design-build project.  If this is the case, will the designer of the contractor team be responsible to approve shop/working drawings?

 A:  No.  Wallace, Montgomery & Associates will be responsible for reviewing and approving the shop/working drawings to ensure their conformance with the IFB. 

Q:  Under the section, "Modifications to the IFB", Letter B states, "All elements of the temporary support structure shall also be designed to support any additional loads that might be imposed upon it, including, but not limited to stream flow and ice impact, at the discretion of the engineer designing the temporary support structure."  Could you please further define, "any additional loads that might be imposed upon it" and provide actual values other than those provided in section TS-7 (Dead Load, Construction Live Load, Wind Load and Snow Load) for which the temporary support structure shall be designed to resist.  Although it is not specifically stated, is the temporary structure to be designed to resist future jacking loads and if so, what are the values?

 A:  The wording was provided to emphasize that additional loads might be required for design.  For instance, if in-stream supports are utilized, they must be designed for stream flow and ice impact based on the geometry of the substructure elements.  Stream flow and ice impact loads shall be as required by the Design Specifications listed on page TS-6 of the IFB, using an average stream flow velocity of 10 fps and an ice thickness of 1".  Please see response to Question No. 4 below for further explanation regarding jacking bases.

 Q:  Are jacking bases required to be included in this project for future jacking purposes?

 A:  If jacking bases are required to achieve the specified movement of the covered bridge structure under the future rehabilitation contract, then they shall be provided.  The design load on the jacking bases will vary depending on their quantity, location, and construction sequence.  The engineer designing the temporary support structure shall be responsible for designing the jacking bases based on the loads required by the IFB.  A jacking sequence shall be provided to ensure that the structure is properly jacked and that the design loads imposed upon the jacking bases and are not exceeded during jacking.

 Q:  In Addendum 3, under the section, Questions from the floor, Number 2 states a letter concerning ROW is attached.  This document was not attached to the Addendum we received.  Please provide.

 A:  This letter will be provided to all prospective bidders.

 Q:  In Addendum 3, under the section, Questions from the floor, Number 12 states that the 150 calendar day completion time includes both design and construction time.  Please clarify the review times of design submittals.

 A:  Wallace, Montgomery & Associates will require approximately two weeks for the initial review of the temporary support structure working drawings.

 Q:  It will be difficult to construct temporary support substructure elements consisting of timber or steel cribbing, based on the requirements of the IFB.  Is it possible to use cast-in-place concrete as a substructure element for the temporary support structure?

 A:  Given the possibility that the temporary support structure could remain in place for an extended period of time, the substructure elements may be constructed of cast-in-place concrete.

END OF PROSPECTIVE BIDDER QUESTIONS