Rehabilitation Improvements for the Nogales Trunkline and ...Project Description •This rehab will...
Transcript of Rehabilitation Improvements for the Nogales Trunkline and ...Project Description •This rehab will...
Rehabilitation Improvements for the Nogales Trunkline and International
Outfall Interceptor (IOI)
Southeast Arizona Citizens Forum MeetingSahuarita, Arizona
Jose A. NuñezPrincipal Engineer
International Boundary and Water CommissionUnited States Section
Engineering Department
September 15, 2016
Presentation Outline
• Project Area and Sewerline Alignment
• Background
• Purpose of the Sewerline Rehabilitation Project
• Project Description
• Design Work
Project Area and Sewerline Alignment
ORIGINAL LOCATION OF NIWTP
Background• Under Minute 206, Nogales International Sanitation
Project was originally constructed to serve Nogales,
Sonora, and Nogales, Arizona
• The project as authorized consisted of (1) a sewer
pipeline with 7,200 feet in Mexico; (2) 8,146 feet of
sewer pipeline in U.S.; and (3) a treatment plant.
• Nogales International Wastewater Treatment Plant
(NIWTP) was situated approximately 1.5 miles north
of the border and had a 1.6 mgd treatment capacity.
Background (contd.)
• In 1967, under Minute 227, a larger plant with 8.2
mgd capacity was constructed. At the request of the
City of Nogales, the larger plant was constructed in
Rio Rico, AZ, approximately 9 miles north of the
border. Construction completed in 1972.
• Sewerline portion from border to location of original
NIWTP is called ‘trunkline.’ The remaining sewerline
portion necessitated because of the relocation to Rio
Rico is called the ‘IOI.’
Background (contd.)
• In 1992, under Minute 276, a subsequent
expansion of the NIWTP to a capacity of 15.75 mgd.
• In 2009, with further technological treatment
improvements, plant capacity was reduced to 14.74
mgd.
Background (contd.)
• Currently, domestic and industrial wastewater
generated in Nogales, Sonora, is conveyed north by a
gravity collection system through the sewerline and
across the international border to Nogales, Arizona.
Wastewater from the City of Nogales, Arizona is
collected into the trunkline and IOI. The combined
wastewater flows from both countries are conveyed
northward to the NIWTP, where treatment takes
place prior to discharge into the Santa Cruz River.
Background (contd.)
• The sewerline has over one‐hundred manholes
within its alignment.
• The sewerline ranges in size between 24 inches and
42 inches in diameter and is comprised of unlined
reinforced and unlined unreinforced concrete
sections.
IOI Damage 2010
IOI Damage 2010
IOI Repair 2010
Nogales Wash Flood Damage 2014
Purpose of Sewerline Rehabilitation Project
•To rehabilitate an almost 50‐year old sewer line that
has reached its useful life.
•To avert a spill or leakage of sewage in order to
ensure the continued health and safety of the
communities of Ambos Nogales as well as
downstream communities along the Nogales Wash
and Santa Cruz River in Arizona.
•To rehab and repair any existing structural damage.
Project Description
Project Description
•This rehab will utilize the Cured‐in‐Place Pipe (CIPP)
process. CIPP generally is considered to be a
trenchless technology with little or no disruption to
the existing ground conditions.
• A resin filled polyester felt tube, or liner, is inserted
or inverted into an existing pipe, inflated with water
or steam and cured‐in‐place.
• Resulting pipe inside of a pipe is a structural
replacement of the host pipe.
Project Description (contd.)• Rehab will address operational defects such as
current accumulation of debris, groundwater inflow
and infiltration, current root intrusion in manholes
and pipeline throughout the sewerline. However,
vegetation along pipeline route must be managed to
avoid future root intrusion.
• Rehab will address current structural defects
including corrosion, cracks, wall penetrations, and
invert erosion.
Existing Sewerline Issues
Pipe Deterioration
Inflow & Infiltration
CIPP Process
Cured-in-Place Pipe (CIPP)
Design Work
• In January 2015, the USIBWC entered a cost‐share
agreement with the City of Nogales, Arizona for the
design of rehabilitation improvements to the pipeline.
•In May 2014, the USIBWC awarded an engineering
design contract to AECOM/URS Corporation for the
sewerline rehabilitation design.
•The project is divided into five (5) phases. So, five
separate sets of plans and specifications will be
developed.
Design Work (contd.)
• Phase 1: Between MH #85 and MH #99
• Phase 2: Between MH #1 and MH #37
• Phase 3: Between MH #37 and MH #51
• Phase 4: Between MH #51 and MH #66
• Phase 5: Between MH #66 and MH #85
Note: MH = manhole;
Manhole #1 is closest to the International border.
Phase 1
Phase 5
Phase 4
Phase 3
Phase 2
Design Work ScheduleCurrently the design for Phase 1 of this Project is nearing 100% completion.
Below is a summary table showing the revised due‐dates of the phased 90% and 100% deliverables:
Task Phase 1 Phase 2 Phase 3 Phase 4 Phase 5
90% Submittal 27 Jun 2016 12 Sep 2016 12 Sep 2016 19 Dec 2016 19 Dec 2016
90% Comments 18 Jul 2016 03 Oct 2016 03 Oct 2016 16 Jan 2017 16 Jan 2017Pre-final Submittal 01 Aug 2016 24 Oct 2016 24 Oct 2016 06 Feb 2017 06 Feb 2017Pre-final Comments 15 Aug 2016 14 Nov 2016 14 Nov 2016 27 Feb 2017 27 Feb 2017
100% Submittal 29 Aug 2016 05 Dec 2016 05 Dec 2016 13 Mar 2017 13 Mar 2017
Bid Services 13 Mar 2017 N/A N/A N/A N/A
Open Discussion and Questions