20A - AA- EMERGENCY REPAIRS - Laserfiche WebLink

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Authorize Urgent Repairs to the Third and Birch Parking Structure, First Street Bridge over Santa Ana River, Safety Wall adjacent to Railroad Tracks, and Drainage Channel Sinkhole South of First Street March 21, 2017 Page 2 b) The second urgent repair is to the First Street Bridge over the Santa Ana River (Exhibit 2). A fire that was allegedly caused by transients living at the southwest bank of the river resulted in structural damage to the underside of the bridge. A structural engineer was immediately engaged to assess the damage and make the area temporarily safe. The bridge repairs require structural engineering inspection and oversight before resuming full regular use. The cost to repair the bridge and provide structural engineering is not expected to exceed $50,000. c) The third location is a partial collapse of the Safety Wall between the railroad tracks and adjacent residential properties near the intersection of Lincoln Avenue and Beechwood Street (Exhibit 3). The recent rain activity weakened the wall footings which resulted in the wall's partial collapse. Staff has already provided temporary measures to make the area safe. The permanent repairs will be coordinated with the Southern California Regional Rail Authority ( SCRRA - railroad operator) due to the close proximity to the railroad tracks. SCRRA may require additional engineering and repairs to an adjacent 4- foot -wide drainage channel. Staff will assess the drainage issues and report them back separately. The cost to rebuild the safety walls is not expected to exceed $40,000. d) The fourth location is a drainage channel which runs east and west, parallel to and south of First Street. The mobile home park located at 4080 W. First Street drains to the rear and into the subject channel. The channel walls are collapsing and the adjacent mobile homes are in danger of becoming undermined by a sinkhole that has developed (Exhibit 4). Staff recommends the voids filled with slurry cement material followed by structural concrete slab replacements at a cost not to exceed $30,000. Long -term channel rehabilitation will be necessary, and staff will be engaging a consultant to perform a detailed analysis for future permanent repairs. The urgent repairs at the four locations identified above may be completed most rapidly by performing the work on a design -build contract basis and by engaging a well- equipped contractor with the knowledge and capabilities to perform structural building and structural site work. Arnaz Engineering Contractors, Inc., is mobilized in the City for construction work on the Walnut Pump Station project and is immediately available to perform these additional repairs. Work carried out on a design -build basis limits costs to time and material pricing methods. That means costs paid by the City would be capped to actual costs and quantities of materials used by the contractor at standard materials pricing, and limited to actual man -hours worked at standard prevailing wage rates (Exhibit 5). This contractor will also be passing on savings to the City because they are already mobilized and working for the City. Staff is prepared to take detailed inspection notes and accounting of materials and labor consumed to monitor progress and billing. Time and material contracting is industry accepted, is considered a neutral method by agencies /owners and construction contractors, and is typical of emergency contract work. 20A -2