AgdaPkt 2010-03-22 - Laserfiche WebLink

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6.1 D Page 1 �� T�t��#��n�rar��e��b�a�d��; : `Fr+c�n�he�i ll�a�r�``� March 22,2010 Sus�ECr Redwood Shares Lagoon Maintenance Dredging Project — Addition of Optional Bid Items to Existing Contract RECOMMENDATION Approve, by motion, addition of Optiona[ Bid Items 12a and 12b in the amount o# $329,940.00 for dre�ging Zone 16 to the existing construc#ion contract in the amoun#of $712,700.00 for the Redwood Shores Lagoon Maintenance Dredging Project, and authorize the Ciiy Manager to increase the revised tofal contract amount of $1,042,64Q.Q0 up to 10°/a,if necessary. BACKGROUND The Redwood Shores Lagoon Maintertar�ce Dredging Project is designed#o improve the water quality and the seroiceabili#y of the Redwood Shores storm drainage system which inciudes the lagoons. The lagoans in Redwvod Shores have not been dredged since they were first created and silt deposits have accumulated for over forty years from storm run off and the bay's #idal action. Silt build-up adversefy effects water circulatian which encourages the growth of widgeon weed. Council awarded the Redwood Shores Lagoon Maintenance Dredging Project to Aquatic Environments, (nc. on October 12, 2010 for the base bid amoun# of $712,700.00. The base bid included the worlc to ctredge the lagoons and pump dredged material #o Area H for beneficial reuse in wetlands restoration. Op#ionai bid items to dredge other specific areas af the lagoans, including Zone 16, were not awarded because materials dredged from these zones were unsuitable for reuse and the cost to dispase of those spoi(s significanfly increased the cost of the contract. The cost of all optional bid items totaled$1,473,�64. The work of the contract (the base bid items) nears completion and there is an opportunity at this point to include the wark to dredge Zone 't6 (Optiona! Bid ifems 12a and 12b)at a cost anticipated fo be lower than the originat bid price. Since the time the contract was ofiginally awarded, the contractor has found a nearby site that will accept the material dredged from Zone 16 which reduces the con#raetor's cost ta transport and dispose of the spoils. As well, the contractor is prepared to act as the primary rather than subcontract the work for 2one 16 which reduces mobilization/demobilization costs. As a result,staff expects the city's final contract cost for the optionaf bid�tems to dredge Zone '[fi to be significantly fess than the originally bid. The city intends to add the optional bid items to the work of the existing contract at the bid price and make an adjustment to the finai contract c�st at the conclusion of al!work which will reflect the savings.