Perris Valley Pipeline I-215 Crossing

 

In 2011, MWD completed construction of most of the 4-mile long Perris Valley Pipeline (PVP) South Reach pipeline, with the exception of a segment that crosses Interstate 215 which represents about 3,000 feet. Due to encountering high ground water during this first construction attempt, it was decided to revisit alternative construction methods to complete the pipeline connection. The Parsons, Brierley, and DRP team’s, with MWD’s approval, design called for tunneling with a full dewatering and treatment system to mitigate high levels of groundwater.

 

DRP Civil Designer, has taken the lead role of providing full and exclusive drafting and design support to Metropolitan Water District (MWD), Parsons Corporation and Brierley Associates project team in designing 3,000 linear feet of 97-inch inside diameter pipeline which includes (2) vertical launching shafts ranging between 25-feet and 50-feet in nominal diameter and (2) vertical receiving shafts that are 25-feet in nominal diameter. The segment between shaft no. 1 and shaft no. 2 (“segment no. 1”) tunnels from the west side of I-215 towards the east and crosses under railroads and Caltrans’ highway I-215 through a proposed 112-inch steel casing. The contractor has an option to increase the casing by their own means and methods. Segments 2 and 3 tunnel southerly along the east side of I-215 and Van Buren Blvd and are also through a 112-inch steel casing. Tunnel segment no. 3 crosses underneath the March Joint Powers Authority’s museum which includes airplanes above the tunnel at grade. DRP’s design also includes the finished 97-inch ID pipeline and its appurtenances and permanent structures – (4) manholes, (1) 97” temporary bulkhead, layout of bend fitting details, and permanent fencing/access gates. Additionally, DRP supported the team with layout and drawing development for water discharge and treatment operations during construction which include over 2-miles of temporary discharge pipelines which cross I-125 through existing culvert systems, (4) temporary treatments plants, access to more than a dozen existing MWD manholes, and all necessary contractor work limits associated with discharge operations.

 

DRP’s scope of work includes layout of horizontal and vertical alignments utilizing InRoads software, locating launching and receiving shafts to best avoid utilities and other surface setback requirements, layout of contractor’s work, storage, and access during construction work limits, development of plan and profile drawings, cross sections, converting Caltrans’ existing utilities from different working units to MWD’s working units, utility research and potholing plans, plotting borehole information on plans, managing and ensuring adherence to MWD’s CAD/CAE standards, and coordinating among the consultants and MWD Managers and Staff.

Sepulveda Feeder PCCP Preliminary Design

 This project is part of the PCCP Rehabilitation Program for the long-term rehabilitation of Prestressed concrete cylinder pipelines. The main objective of the project is to reduce risks associated with the Sepulveda Feeder, particularly the PCCP portions. During the earlier Alternatives Analysis stage of the project, the coiled-steel liner method of rehabilitation was selected as the most appropriate method of reducing the risks associated with PCCP degradation. This project is part of the PCCP Rehabilitation Program for the long-term rehabilitation of Prestressed concrete cylinder pipelines. 

 The South Reach is defined as the Sepulveda Feeder, between the Venice Pressure Control Structure and the Second Lower Feeder. The existing pipeline in this reach ranges from 96-inches to 84-inches and has a designed liner diameter of 83-inches and 71-inches respectively. Total length is approximately 15.5 miles. Project Features include: Pipe Access Sites which has an excavation footprint of 40-feet long by 20 feet wide, replacement of existing spherical and conical valves ranging from 42-inch to 54-inch to be replaced with 60-inch and 42-inch respectively, replacement of existing valve structures, replacement of valves at service connections and meters, and the design of structural items such as temporary bulkhead, connection details, and liner details. 

 

DRP is the CAD/CAE Manager for this South Reach project which includes management of drafting and design staff for HDR, CDM, and DRP. These activities include developing and implementing specific MWD PCCP standards and continued guidance to the project team, development of (200) drawings which include (80) plan and profile drawings, (23) detailed site plans for each pipe access site location including plotting utilities from multiple data sources, permitting assistance for bore hole activities, 3D modeling of existing and new valve vaults, traffic control plans, and many general sheets.