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File Number: 16-255 <br />This project for maintenance of deteriorated sanitary sewer facilities repairs pipes and <br />manholes at ninety-three locations throughout the City. The work includes traffic control, <br />excavation, replacement of defective underground facilities, reconnection of sewer laterals <br />affected by the repairs, trench backfill and compaction, and surface restoration. The project <br />scope also includes storm drain repair at a few locations, since the nature of that work is <br />similar to the repair of sewer facilities. <br />This project was originally funded in the amount of $1,400,000.00, and the original <br />construction contract amount was $1,114,310.00. In April 2016 City Council authorized <br />additional funding for the project in the amount of $291,510.04 to replace and upsize a <br />deteriorated sanitary sewer main on W. Juana Avenue that serves the Marea Alta residential <br />housing development ($193,555 construction plus $15,000 engineering and inspection), to <br />repair a badly leaking sewer force main at the intersection of Merced Street and Fairway Drive <br />($32,825 construction plus $3,000 engineering and inspection), and as well as to fund work <br />required due to unforeseen underground conflicts. However, project costs are now projected <br />to exceed project funding for the reasons described below. <br />1. Additional quantities for asphalt concrete paving <br />2. More extensive pipe deterioration than was visible by video inspection <br />3. More numerous lateral connections than were listed in our records or visible by video <br />inspection <br />4. Unforeseen utilities that required hand work to dig around <br />5. Traffic control durations that exceeded our estimates <br />6. Pipe repairs located deeper than listed in our records <br />Analysis <br />The existing project funding of $1,702,488.79 is insufficient to cover the total project cost. <br />The project scope will need to be reduced if additional project funding is not authorized. <br /> <br />Staff has reviewed the events that occurred during the subject project to help ensure that <br />future projects will not have such a high change order percentage. A discussion of these <br />items follows. <br /> <br />Asphalt Concrete Paving <br />Some contract change orders potentially could have been avoided if the estimated quantity of <br />asphalt paving had been more accurate. Asphalt concrete paving was used to resurface <br />trenches and restore the street surface around manhole excavations. Paving at manhole <br />excavations was inadvertently excluded from the estimated quantity of work; consequently a <br />change order was required to cover the cost of this work. Asphalt concrete paving quantities <br />will be double checked by the Senior Engineer before going to bid on future projects. <br />Video Inspection <br />Some contract change orders potentially could have been avoided if sewer inspection videos <br />of the project sewer segments were filmed during the design phase or shortly prior. The <br />design of this project was based on video inspection that was up to 6 years old. While this <br />was sufficient in most cases, several locations deteriorated significantly or had new lateral <br />connections installed between the video inspection and construction, leading to larger repairs <br />Page 2 City of San Leandro Printed on 7/13/2016 <br />123