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HomeMy WebLinkAbout11 REMEDIAL GRADING 11-21-94NO. 11 11-21-94 )ATE: NOVEMBER 21, 1994 Inter-Com lO: WILLIAM A. HUSTON, CITY MANAGER PUBLIC WORKS DEPARTMENT/ENGINEERING DIVISION FROM: APPROVAL OF PLANS AND SPECIFICATIONS AND AUTHORIZATION TO SUBJECT: ADVERTISE FOR BIDS, REMEDIAL GRADING FOR JAMBOREE ROAD DISPOSAL SITE NO. 2 RECOMMENDATION That the Tustin City Council at their meeting of November 21, 1994 approve the plans and specifications for the Remedial Grading for the Jamboree Road Disposal Site No. 2, and authorize the advertisement of bids for said project. FISCAL IMPACT No impacts to the City General Fund. Ail costs will be initially borne by City of Tustin Assessment District No. 86-2 with reimbursement being sought through litigation against the responsible parties. Estimated cost of the remedial grading is $781,000.00. BACKGROUND In July, 1988 the City of Tustin formalized Assessment District No. 86-2 (AD86-2) which provided funding for the public infrastructure improvements within a portion of the Tustin Ranch Development. One of the AD 86-2 projects was the construction of Jamboree Road between Irvine Boulevard and Santiago Canyon Road in the City of Orange. The Jamboree Road project included a cut and fill grading operation that resulted in an excess amount of earth which was placed in two disposal site areas within the vicinity of the project. These disposal sites are identified as the Jamboree Road Disposal Site No. 1 and No. 2. The disposal site in question and the topic of this memorandum is identified as Disposal Site No. 2, which is located within Tract No. 13627 and lies within portions of Lots 1, 10, 11, 16, 17 and 18 of that tract. During the Jamboree Road construction, excess material from the roadway grading operation was placed within the limits of Disposal Site No. 2. As a part of this operation, the City contracted the geotechnical services with the firm of Geo-Soils, Inc. to serve as the City's geo-technical inspectors/soils engineers for the grading operation within the disposal site area. These contracted services included, but were not limited to, the following: Approval of Plans and Specifications and Authorization to Advertise for Bids, Remedial Grading for Jamboree Road Disposal Site No. 2 November 21, 1994 iPage 2 i · Provide direction to the contractor as to the limits of unsuitable material prior to the placement of any fill material within the disposal site area. · Evaluate and direct the contractor as to the required limits of alluvial material removal within the disposal site area. · Inspect the placement of excess fill material within the disposal site area and perform compaction testing on all replaced alluvial material from the site and all excess fill material generated from the Jamboree Road project. The initial grading operation within Disposal Site No. 2 has been completed by the City's contractor. However, as a result of the Irvine Company's final plan preparation for final grading on Lot 10 of Tract No. 13627, it was discovered that certain areas within Disposal Site No. 2 still contained unsuitable material identified as alluvial deposits, which have the potential for consolidation/ collapse when subject to excessive moisture. These findings were confirmed byan independent (third party) geo-technical consultant hired by the City. The City Council previously authorized binding arbitration with the Irvine Company to resolve a dispute over who was responsible for the remediation of this soils problem. On September 2, 1994, the arbitration was conducted by the Judicial Arbitration Service (Judge Blanpied) and was found in favor of the Irvine Company. Additionally, it was directed that the remedial grading operations be implemented at the earliest feasible date. The Irvine Company and the City have tentatively agreed to commence work in late March or early April, 1995 with completion scheduled for late May or early June, 1995. DISCUSSION Plans and specifications for the Remedial Grading for DisPosal Site No. 2 have been completed and are now ready for the City Council's approval and authorization to advertise for bids. It is the City's intent not to commence any work on this project until after the upcoming rainy season. However, to expedite the project, staff is proposing to commence the bid advertisement at this time to complete all of the necessary administrative work by February, 1995. Following is a tentative schedule for the remedial grading project: Approval of Plans and Specifications and Authorization to Advertise for Bids, Remedial Grading for Jamboree Road Disposal Site No. 2 November 21, 1994 Page 3 City Council Authorization to Advertise Bids ............................ First Legal Advertisement ................. Second Legal Advertisement ................ Open Bids ................................. Award Bid .................................. November 21, 1994 December 01, 1994 December 08, 1994 December 20, 1994 January 16, 1995 1995 1995 Commence Work - Mid March Complete Work Mid-May A detailed Scope of Work will be developed with the geo-technical firm of Converse Consultants West to provide inspection and testing services during the remedial grading operations pertaining to Jamboree Road Disposal Site No. 2. This firm is the same firm that the City previously utilized as their independent (third party) geo-technical consultant. A Professional Services Agreement for this work will be scheduled for City Council consideration concurrently with City Council award of the construction contract. Director of Public Works/ city Engineer ~r~ Ot%eson Associate Civil Engineer