07 - Laserfiche WebLink

7) West Las Positas Boulevard Bridge at Tassajara Creek (Br No. 33C-0436): The scope of work for this bridge included urgent repairs to the wall around the drainage hole located at the centerline of Abutment 4, repairing spalls at the Pier 3 support, and repairing spalls at the wingwall culvert joint at the northeast and southwest corners of the bridge. DISCUSSION On June 16, 2015, City Council awarded the construction contract to ETIC Engineering, Inc., in the amount of $541,423.60. Council also authorized $90,900 for Pakpour Consulting Group to provide construction management and inspection services for the Bridge Improvements at Various Locations project, CIP No. 135008-FED ID 5101(027). City Council also authorized a contingency amount of$54,142 for any necessary related project work discovered during construction. In September 2015, while performing contract work for spall repair around a storm drain opening on the Tassajara box culvert under West Las Positas, the contractor discovered that the wall had failed around the storm drain. The active lanes of traffic above the failing culvert wall were immediately closed to traffic. The design engineer (BCA) was called in to produce a temporary shoring design and a permanent repair design for the culvert. The project was urgently required in order to complete the repairs before the upcoming anticipated El-Nino rains as the temporary shoring would be subject to damage by heavy water flows. ETIC proceeded with temporary shoring and permanent repairs on a Time and Material basis. Work continued throughout October and was completed just prior to the first rain event. One full section of wall was replaced in three stages to prevent loss of soil behind the wall. Due to the urgent need to make the repairs to the failing culvert wall section the City Manager authorized an increase to the project contingency by $60,000 on October 15, 2015, to cover the anticipated additional expenditures for the urgently required repairs. The additional expenditure was funded out of the West Las Positas Street Sinking Repairs project, Capital Improvement Program (CIP) No. 115014. The contractor was unable to complete the work within their initial estimate due to varying site conditions that were not known until the wall was removed. Also, additional traffic control and design work were required to address the site conditions creating a project short fall of $46,962. It is requested that City Council ratify the City Manager's authorization of the$60,000 increase in contingency, and allocate the additionally needed amount of$46,692. Budget The design and construction of the project was funded through the Caltrans-administered Bridge Preventative Maintenance Program (BPMP), with federal grant funds paying 88.53% and the City paying the local share of 11.47% of the eligible costs. Additionally, local funds were required to pay for expenditures that are outside of the grant-eligible cost. CIP local funding of $102,300 included $18,501 for design and $83,799 for construction to cover non-eligible costs and the local portion of the federal grant. Page 3 of 4