AgdaPkt 2014-04-07 Closed and Regular

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7.1.E. - Page 8 Expanded Task 1: Task 1c - Redwood Shores Pipeline Improvements Consultant shall develop contract documents to seismically-upgrade the large diameter steel pipe (backbone steel pipe, 16" to 24" diameter) in and near Redwood Shores. The intent of these modifications is to install additional isolation valves (about 6 locations) and bypass pipes (at 10 locations), with the intent to be able to sectionalize the pipe network in Redwood Shores after a large earthquake, and thus be able to restore service as rapidly as possible to as many customers as possible. The work plan below is meant to follow the work as envisioned in the FEMA grant applications. In other words, the work is tailored to meet the intent of the FEMA grant application, so that the costs can be approved by FEMA. Should additional work arise during the course of the effort that is not meant to be funded by FEMA, this work would be addressed under separate accounts so that Redwood City can readily assign the suitable costs between FEMA-funded and non-FEMA funded work. Required Submittals: 25% Design Submittal Consultant shall review the locations of all existing Redwood Shores backbone pipe valve locations. Consultant will use original design drawings for this review. We will create a map showing these locations, showing the backbone pipes and valve locations. We will review the available Redwood Shores subsurface boring information and geologic conditions to rank the relative hazard and pipeline reliability for the backbone pipe. Consultant will then walk down each site with these valves in Redwood Shores, to examine the ease for construction of new bypass pipes and outlets. We will look for traffic patterns, availability of nearby sidewalks, cross streets and driveways. We will then prepare a constructability matrix that ranks the ease of construction, relative difficulty for traffic during construction, and efficacy of the upgrade location with regards to improving post-earthquake reliability. We will prepare a report that summarizes the possible locations for installation of new valves (up to about 6 locations) and bypass pipes (10 locations). We will meet with Redwood City to discuss these locations (including a drive through) and select the final locations for implementation. 50% Design Submittal We will prepare drawings and specifications for the designs to be implemented of the type and at the locations agreed to in the 25% submittal. ATTY/AGR/2014/AMENDMENTS/AMEND NO.1 G&E ENGINEERING REV:03-21-14 VR Page 4 of 13