Post on 22-Jun-2020
Sanitary Sewer Condition Assessment
Prepared by
Mission Support Alliance
February 27, 2012
HNF-51469
Revision 0
SANITARY SEWER CONDITION ASSESSMENT HNF-51469
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EXECUTIVE SUMMARY
Mission Support Alliance (MSA) has responsibility for all sanitary wastewater at the Hanford Site in the
100 Area, 200 Area, and 600 Area. Currently the sewer lagoon in the 100N Area handles the collected
wastewater from the most populated area of the Central Plateau. Some of the more remote and
disconnected facilities have septic systems. Other facilities have holding tanks from which the
wastewater is pumped and hauled to the treatment facility. A new aerated evaporative lagoon is currently
being constructed in 200 West Area. In 2012, when the 200 West Lagoon is completed, the 100N Lagoon
will be turned over for demolition, and much of the wastewater on the Central Plateau will be piped
and/or hauled to the new lagoon. Most septic systems continue to operate well and are projected to
provide adequate service as populations decline. However, as septic systems fail and are converted to
holding tanks, their wastewater will be hauled to the new lagoon as well. Consequently, this plan
envisions the 200 West Lagoon as the principal treatment option for the Site through the targeted Site
closure in 2045.
The following list represents the primary recommendations for the Hanford Site Sanitary Sewer Systems:
1. Complete construction of a new aerated evaporative lagoon in 200 West Area.
2. The new 200W Lagoon is a long term solution adaptable to conditions as facilities are
decommissioned.
3. A new evaporation lagoon in 200 East is a potential option to support the proposed 200E office
complex and fueling systems.
4. As more facilities are decommissioned, gravity sewer flows will decrease necessitating
coordinated flushing with the potable water system to prevent sediment build-ups and the
formation of methane gas and acidic degradation of the collection piping system.
5. As septic systems are retired and facilities are removed from the piped collection system, there
will be a need for more holding tanks and haul trucks.
6. A need exists to evaluate system engineering processes to better integrate:
a. Site-wide communications
b. Equipment, facility, and maintenance platforms
c. A program to verify the integrity and long-term reliability of main trunk sewers.
This plan evaluates a limited number of Hanford Site Septic Systems in an effort to determine the overall
condition and life expectancy. A more comprehensive analysis is performed periodically and is located in
the Hanford Site Sanitary Sewer System Master Plan.
SANITARY SEWER CONDITION ASSESSMENT HNF-51469
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INTERFACE MATRIX BETWEEN MSA AND KEY STAKEHOLDERS
STAKEHOLDER STAKEHOLDER
CONTACTS MSA CONTACTS
INTERFACE
CONTROL
DOCUMENT
DOE/RL Liz Bowers
(509) 373-9276
Sheila Hahn
(509) 376-5940
Roy Hammond
(509) 373-5824
DOE/ORP Garth Reed
(509) 376-2626
Roy Hammond
(509) 373-5824
WTP/BNI William Clements
Scott Booth
Mike Pell
Roy Hammond
(509) 373-5824
24590-WTP-ICD-MG-
01-001 & 002
WRPS
Tank Farm
Operations
Tom Mackey
(509) 373-3823
Christopher Woehle
(509) 373-2424
Roy Hammond
(509) 373-5824
HNF-4493, Rev. 1
June 28, 2010
CHPRC Tony Jennings
(509) 373-3447
Steve Moore (100K)
(509) 373-2567
Dave Kuehn (400 Area)
(509) 373-0228
Roy Hammond
(509) 373-5824
HNF-46148, Rev. 0
May 2010
WCH Arnie Gutmanis (100N, 300
Areas) (509) 531-8162
Scott Feaster
(509) 372-9213
Roy Hammond
(509) 373-5824
SANITARY SEWER CONDITION ASSESSMENT HNF-51469
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ACKNOWLEDGEMENT SHEET
The following individuals, with specific expertise and experience, participated in the preparation and
reviews of the Hanford Site Sewer System Condition Report.
Randy Adkins SI&U Operations
Ron Bannister Support Engineer
Kirt Bare Civil Engineer
Mary Curry Formatting/Tech Editing
William Dethero Mechanical Engineer, Jacobs
Roy Hammond Sewer Utilities Manager
Brian Harmon Project Manager
Dave Mears Program Manager, Jacobs
Brad Pratt Mechanical Engineer, Jacobs
Tom Sackett Director of Projects
Pat Shults Formatting/Tech Editing, Jacobs
Mark Smith Mechanical Engineer, Jacobs
Gary Stevens Design Authority
DISCLAIMER
This Report was prepared for Mission Support Alliance. While it is believed that the information contained
herein will be reliable under the conditions and subject to the limitations set forth herein, neither Jacobs
Engineering nor Mission Support Alliance warrants or guarantees the accuracy thereof.
The use of this Report or any information shall be at user’s sole risk. Such use shall constitute a release and
agreement to hold harmless, defend and indemnify Jacobs Engineering and Mission Support Alliance from
and against any liability (including but not limited to liability for special, indirect, or consequential damages)
in connection with such use. Such release from and indemnification against liability shall apply in contract,
tort (including negligence of such party, whether active, passive, joint or concurrent), strict liability, or other
theory of legal liability; provided, however, such release, limitation and indemnity provisions shall be
effective to, and only to, the maximum extent, scope or amount allowable by law.
This document shall not be utilized in connection with any prospectus, proxy solicitation, loan
documentation, purchase/sale transaction or any other materials, which may be reasonably expected to affect
any third party investment decision.
SANITARY SEWER CONDITION ASSESSMENT HNF-51469
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TABLE OF CONTENTS
1.0 INTRODUCTION .................................................................................................................. 1
2.0 200/600 SEWER SYSTEM FACILITY ................................................................................. 5
2.1 200/600 Sewer System Description ............................................................................... 5
2.2 200/600 Sewer Systems Condition Assessments and Recommendations ...................... 5
3.0 REFERENCES ....................................................................................................................... 7
FIGURES
Figure 1 - Hanford 200/600 West Sanitary Sewer Systems ........................................................... 2
Figure 2 - Hanford 200/600 East Sanitary Sewer Systems ............................................................. 3
Figure 3 - Hanford Holding Tanks .................................................................................................. 4
Figure 4 - 100N Sewer Lagoon ....................................................................................................... 4
TABLES
Table 1 - Reviewed 200/600 Sanitary Sewer Conditions and Recommendations.......................... 5
Table 2 - Reviewed 200/600 Sanitary Sewer Conditions and Recommendations.......................... 6
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ABBREVIATIONS/ACRONYMS
DOE U.S. Department of Energy
gpd Gallons per Day
ISAP Infrastructure and Services Alignment Plan
LOSS Large Onsite Sewer System(s)
M&O Maintenance and Operation
MSA Mission Support Alliance, LLC
SANITARY SEWER CONDITION ASSESSMENT HNF-51469
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1.0 INTRODUCTION
Mission Support Alliance, LLC (MSA), manages the infrastructure and utility systems at the
U.S. Department of Energy (DOE) Hanford Site in south-central Washington State. To enhance the
management of the utilities and support the Site Infrastructure and Services Alignment Plan (ISAP), MSA
conducted a conditions assessment of the sanitary sewer systems. This assessment identifies essential
components, documents current conditions, and provides engineering analysis to more clearly determine
current conditions. These assessments provide the basis for future systems maintenance and operation
(M&O) planning and will be an input to future master plans.
The condition of the 200/600 Area sanitary sewer system described in this report represents the condition
of the systems as of December 31, 2011. Any change in condition of the water system after this date is
beyond the scope of this document and in no way lessens the accuracy of the assessment.
The Hanford Site uses several methods to dispose of sanitary wastewater due to dispersed populations and
topography. These methods include septic tank soil absorption systems, holding tanks, a lagoon system,
and routing to a nearby municipal treatment plant. Current systems at the Hanford Site include the
following:
• Regional Systems: Septic tank soil absorption systems with a daily design flow rate less than
54,890 liters/day (i.e., 14,500 gallons per day (gpd)). Each system consists of a septic tank, a
dosing siphon or an effluent pump and a drain field. Incoming sanitary waste is delivered by
gravity or by a pump. Regional systems are centrally located near concentrated population
centers (see Figure 1 and Figure 2).
• Individual Systems: Septic tank soil absorption systems with a small flow rate, generally less than
13,250 liters/day (i.e., 3,500 gpd). Each system consists of a septic tank, a dosing siphon or an
effluent pump and a drain field. Incoming sanitary waste is delivered by gravity or by a pump.
Individual systems normally serve single facilities located too far from a regional system to
connect economically to a regional system (see Figure 1 and Figure 2).
• Holding Tanks: Collection vessels adjacent to temporary facilities (see Figure 3). Sanitary
sewage is pumped regularly from holding vessels and is presently transported to the 100N
Lagoon for treatment and disposal. With the completion of the 200W Lagoon and the closure of
the 100N Lagoon the sanitary sewage will be transported to the 200W Lagoon for treatment and
disposal.
• Portable Holding Tanks: Self contained sanitary sewer facilities that have no buried or separated
tanks, and can be relocated as necessary around the Hanford site, yet still require frequent effluent
removal. These facilities have inherently low holding capacity, typically are not connected to a
water supply source, and serve minor projects with small populations.
• 100N Sewage Lagoon (Figure 4): A Washington State Department of Ecology permitted sanitary
wastewater lagoon located about one half mile southeast of the N-Reactor in the 100N Area. The
100N sewage lagoon receives direct inflows from the 100N Area, and wastewater from holding
tanks, portable toilet/shower units, and failed systems that are hauled to the lagoon. The 100N
Lagoon will be decommissioned in 2012 as the new 200W Lagoon becomes operational.
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Figure 1 - Hanford 200/600 West Sanitary Sewer Systems
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Figure 2 - Hanford 200/600 East Sanitary Sewer Systems
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Figure 3 - Hanford Holding Tanks
Figure 4 - 100N Sewer Lagoon
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2.0 200/600 SEWER SYSTEM FACILITY
2.1 200/600 SEWER SYSTEM DESCRIPTION
Out of the 72 regional and individual sewer systems at Hanford, 31 are operated and maintained
by MSA. The regional and individual sewer systems are primarily stand-alone systems and in
some locations, small systems are grouped together with lift stations to pump influents to and
from the sewer system.
2.2 200/600 SEWER SYSTEMS CONDITION ASSESSMENTS AND
RECOMMENDATIONS
To assess the condition of the system as a whole, a sample of six sites were inspected with the site
utility personnel. During the site visit, three of the sewer systems were experiencing minor
problems but continued to provide service. Sewer system 2607-W16 is the largest system in
200W and lacks telemetry to retrieve flow data. The drain field is also overloaded and floods
frequently.
Two units, 2607-W6 and 2607-E1, were experiencing problems and were out of service, due
either to lack of controls or spare parts.
Wastewater flows from the two units are pumped to the lagoon at 100N. The Large Onsite Sewer
System (LOSS) at 2607-E12 was working, but frequently needed to be pumped to the 100N
Lagoon, due to lack of drain field capacity (see Table 1 and Table 2).
Table 1 - Reviewed 200/600 Sanitary Sewer Conditions and Recommendations
Sanitary
Sewer
System
Location Description Condition Recommendation
2607-W1 M-2904-W
SH-14
Processes 14.5K gpd.
Modified sanitary
sewer system serves
200W central core
and T Plant - High
flows.
System is operational.
Several ports in the drain
field get saturated.
Decommission drain field
and route system piping to
proposed 200-W Sewer
Lagoon (L-691).
2607-W16 H-2-830532 Designed for 14.5K
gpd. Processes 6K
gpd. Modified
sanitary sewer system
serves 270-Z and
272-WA.
System is operational.
System lacks telemetry to
retrieve flow data needed
for compliance reports.
Drain field saturated in
areas.
Decommission drain field
and route system piping to
proposed 200-W Sewer
Lagoon (L-691).
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Sanitary
Sewer
System
Location Description Condition Recommendation
2607-W6 H-2-16457 Designed for 14.5K
gpd. Processes 6k
gpd. Serves part of
222-S. Influent
delivered by three
single-pump lift
stations.
One of the system pumps
at 8-10 gpm failed. Two
of the three system
pumps do not switch in
automatic mode due to
control problems.
Manual resets are
required to alternate
pumps. Waste presently
pumped to 100N Lagoon.
Replace system pump and
fix controls system so that
the pumps are
automatically switched
during operation.
2607-E1 H-2-828885 Lift station connects
to 2607-E1.
Designed for 14.5K
gpd. Processes 7.0K
gpd.
Both system pumps
failed. System is not
operational. System is
currently pumped to
100N Lagoon.
System lacks spare pumps
and is presently out of
service.
2607-E12 H-2-82091 Designed for 6.7K
gpd. Serves 242A.
System lacks drain field
capacity and is required
to be pumped out
frequently.
System needs additional
pump capacity and drain
field need enlargement –
expansion of system to
14.0K gpd is planned.
6607-16 H-2-88756 Designed for 5.0 gpd.
Serves 2025-E and
2025-EA.
Appears to be operating
properly. System lacks
dosimeter and
compliance reporting is
not possible.
Lack of spare pumps may
lead to non–compliance.
Table 2 - Reviewed 200/600 Sanitary Sewer Conditions and Recommendations
100 Areas
Range
Poor Fair Good Onsite System
Components Comments
Onsite
Systems Onsite Systems in 100B/C, 100K and 100H Areas
are non-MSA systems and excluded from evaluation
X
Lagoons
100 N Lagoon is about to be phased out of service
with the Construction of 200W Evaporative Lagoon
System
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200E Area
Range
Poor Fair Good Onsite System
Components Comments
X
Pumps More than 50% of the units in the LOSS are single-
pump operated and need off-the-shelf spares to avoid
emergencies.
X
Level
Controls,
Alarms
Some level control trees are not retrievable for
repairs. Alarms are lights only and result in delayed
notification.
X
Instruments More than 50% of subsystems lack dosimeters cause
for overloading or delayed expansion.
X
Drain field
Some systems get saturated. Drain field for 2607-
E12 for facility 242A requires expansion.
200W Area
Range
Poor Fair Good Onsite System
Components Comments
X
Pumps More than 50% of the units in the LOSS are single-
pump operated and need off-the-shelf spares to
avoid emergencies.
X
Level
Controls,
Alarms
Many alarms are lights only and result in delayed
notification. Lacking standardization in components
for inventory.
X
Instruments More than 50% of subsystems lack dosimeters-
cause for overloading or delayed expansion.
X
Drain field Some systems get flooded. Connecting new loads to
the existing systems, without coordination with
MSA, may lead to overloads.
600 Area
Range
Poor Fair Good Onsite System
Components Comments
X
Small satellite
system
System with small flows (three out of six units are
holding tanks) have less than 1,000 gpd. Hauling
and disposal is required.
3.0 REFERENCES
HNF-6612, 2010, Sanitary Sewer System Master Plan, Mission Support Alliance, LLC, Richland,
Washington.