HomeMy WebLinkAbout07. Construction update on Pleasant Hill-Grayson Creek Trunk Sewer, DP 8412CONSTRUCTION UPDATE:
PLEASANT HILL-GRAYSON CREEK TRUNK
SEWER PROJECT
October 21, 2016
E&O Committee Meeting
Nancy Molina, PE
Associate Engineer
PROJECT BACKGROUND
Construction contract awarded to Mountain Cascade,
Inc. (MCI) for $10,401,854 at the February 18, 2016
Board meeting.
Notice to Proceed was issued on April 4, 2016.
Scope of Work includes:
Installation of approximately 10,000 LF of new trunk and
sewer mains by both open -trench and trenchless
methods and abandonment of approximately 6,000 LF of
old sewer, majority by Grayson Creek.
7.
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PROJECT MAP
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■ = Work Completed
• or Work Remaining
• s Existing 36' Trunk Sewer
Major Crossing Installed
CONSTRUCTION PROGRESS
• Open -trench
• 1,200 LF of 18" and 20" PVC
• Depths of up to 30'
■ 3 Major Crossings
• Installed 36" Steel Casing and
sewer under:
• Contra Costa Canal (62" RCP)
• Grayson Creek (96" RCP)
• Twin Box Culverts (96"x36")
• Pilot Tube Guided Boring
• 1,460 LF of 18-24" VCP
2
CONSTRUCTION CHALLENGES
Soil Conditions
More hard rock than
anticipated
Rock was not
consistent
Rock hardness varied
CONSTRUCTION CHALLENGES
Traffic Control
• Complicated traffic
control plans (TCPs) and
requirements
• Narrow streets
• Highly traveled roadways
• Multiple schools in the
area
• Limited ingress and
egress to neighborhoods
• Hired consultant to assist
with TCPs
Existing Utilities
• Avoiding utilities
• Narrow residential streets
• Low overhead utilities
3
CONTRACT ADMINISTRATION
• MCI Original Bid:
• Change Orders:
• Current Contract:
• Work completed to date:
• Zero (0) Stop notices
$10,401,854
55.,550
$10,457,404
$ 4,086,715
COMPLETION SCHEDULE
• NTP Issued:
• Completion required by:
• Construction Began:
• Estimated Completion:
April 4, 2016
April 16, 2017
May 2016
April 2017
• Project -40% complete and projected to
meet schedule
4
QUESTIONS?