12-13-2011 CC RPT 52 - Laserfiche WebLink

Home

Magnolia Underpass Bid No. 6782 — Change Order • Page 2 At the time of award, the Public Works Department was authorized to negotiate change orders up to $1,163,780.25 (10.0 %). The Public Works Department is requesting an increase in change order authority for Bid No. 6782 by $1,680,051.75; from $1,163,780.25 (10 %) to $2,843,832 (24.4 %) to changes to the construction requested by the City and to address unforeseen conditions encountered during construction. The following is a summary of the unforeseen conditions and scope modifications: Bridge Construction Due to ground water encountered during construction, the method of the Cast in Drilled Hole (CIDH) piles had to be altered. In addition, the Public Works Department revised the requirements for testing the CIDH piles to require a more extensive testing method ($385,500). The UP Railroad requested changes to the bridge waterproofing system ($19,280). There were various minor changes to the retaining walls including additional walls to protect the base of the street lights, changing the type of railings and end treatment conditions ($77,370). Additional UP Railroad requirements during the placement of the Steel Bridge Girders and welding operations including testing ($43,253). Storm Drain Construction The Riverside County Flood Control District required placement of a load distribution slab over their existing box storm drain ($512,000). Revisions to the storm water pumping station including changes to the discharge piping, wet well structure and design, additional shoring and move -ins for installation ($59,691). Railroad Construction The UP Railroad requested changes which included: the City supplying addition railroad ballast; changing the configuration of the wayside horn during operation of the shoofly; and changes to the track switching system ($142,200). Additional mobilization required for shoring the shoofly construction, and pile installation due to changes in construction staging for traffic accommodation ($176,700). Underground Utilities Utility changes included changes to the underground electrical system, finding and relocation of unmarked utilities, and changes to the construction stages to accommodate the revised underground electrical plans ($225,809). City requested revisions to the underground electrical system to relocate above ground transformer cabinets ($184,854). Relocation of two (2) fire detectors service to meet current Fire regulations and codes ($79,230). Revisions to the sewer line under De Anza Avenue, as well as revisions requested by UP Railroad to the sewer line casing under the railroad tracks ($35,176). 52 -2