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Wastewater
Treatment Plant Expansion and Improvements, Valley Sanitary
District, Indio, CA
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| As
Prime Consultant, LEE & RO is responsible for process
analysis, development of a master plan, preparation of plans &
specifications, as well as bidding and construction management
services for a $49 million plant expansion and improvements
project that is being implemented in two phases. The
$24 million Phase 1 project, which will increase the activated
sludge plant capacity from 5 to 10 mgd, includes retrofit of
existing aeration tanks, new Turblex aeration blowers, secondary
clarifiers, chlorine contact tanks, a 54-inch outfall, and sludge
dewatering belt presses. The
$25 million Phase 2 project will include new vortex grit removal,
new primary clarifiers, gravity belt waste activated sludge
thickening, anaerobic digestion, and a cogeneration system. Phase
1 construction is scheduled to be complete in May 2008 and the
Phase 2 project design is scheduled to be complete in June 2008.
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Wastewater
Treatment Plant Phase 1, Phase 2, and Phase 3 Expansion
/
Improvement Projects, City of Patterson
, CA
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As Prime Consultant since 1999, LEE & RO has planned,
designed, and managed construction for three plant expansion
projects. The $6
million Phase 1 Expansion/ Improvement project increased capacity
from 0.5 to 1.3 mgd in 2003 and the $10 million Phase 2 Plant
Expansion/Improvement project further increased capacity from 1.3
to 2.0 mgd in 2006. The
plant, which is capable of nitrogen removal, consists of headworks,
oxidation ditch activated sludge, and percolation ponds. LEE
& RO is currently designing an $8 million Phase 3
Expansion/Improvement project to increase capacity from 2.0 to
2.75 mgd in addition to a $1.5 million improvements project for
the existing Oxidation Ditch No. 1.
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Wastewater
Treatment Plant Rehabilitation and Improvements, Sacramento
Regional County Sanitation District, CA
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SRCSD Regional Plant treats average flows of 154 mgd and peak
flows of 320 mgd. The
master planned ultimate facilities included five new aerated grit
removal tanks, ten 120-foot diameter circular clarifiers, a grit
dewatering building, an odor control facility, an electrical
substation and electrical building.
As Prime Consultant, LEE & RO analyzed plant
hydraulics, aerated grit geometry, grit dewatering and loading
concepts, odor control, and grit transport piping systems prior to
designing a $5 million aerated grit removal tank improvements
project that also included modification of the headworks/primary
clarifier influent hydraulics. LEE
& RO is currently designing modifications to the grit
transport system. The
design is expected to be complete in June 2008.
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Wastewater
Treatment Plant Improvements, Regional Plant 2, Inland Empire
Utilities Agency, Chino
, CA
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As Prime Consultant, LEE & RO is responsible for process
analysis, preparation of the project report, preparation of plans
& specifications, bidding, and construction management
services for $7.5 million in improvements to various solids
processing trains such as automation of the dewatering centrifuge
operation, retrofit of the cake conveyor system, improvements to
gravity and dissolved air floatation thickeners, centrate pumping
optimization, new septage receiving station, and associated
control systems.
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Wastewater
Treatment Plant Upgrading and Renovation, City of Brawley,
CA
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| As
Prime Consultant, LEE & RO is responsible for process
analysis, preparation of the project report, preparation of plans
& specifications, as well as bidding and construction
management services for a $20 million plant renovation and
improvements project at the 5.9 mgd wastewater treatment plant.
LEE & RO is also assisting the City with the State
Revolving Fund (SRF) processing. Project components include a
new activated sludge process complete with new blowers,
secondary clarifiers and sludge dewatering facilities. The
project is in the preliminary design phase and final design is
scheduled to be complete in September 2008.
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Headworks
and Grit System Improvement Project, Point Loma Wastewater
Treatment Plant (PLWTP),
City of San Diego, CA
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As Prime Consultant, LEE
& RO planned, engineered and designed a $25 million project at
the 240 mgd PLWTP. LEE
& RO’s scope included
construction and field-testing of an existing headworks model to
develop/verify flow distribution patterns,
calculate a hydraulic
profile, and determine the most-efficient grit tank dimensional
configuration. The
project includes reconfiguration of the south aerated grit tanks,
a new grit dewatering building, an odor control system, and
influent hydraulics improvements.
The reconfigured south grit tanks have an improved tank
geometry that is based on the model testing results.
The new two story grit dewatering building is 40 feet wide,
140 feet long and 49 feet high and houses seven SlurryCup grit
separators/grit washers/grit storage bins, an electrical room,
foul air fans, and a trucking facility.
Due to extremely congested site conditions, a major project
challenge was developing a construction sequence to facilitate the
construction of the south grit tanks and the new grit processing
building. The project
design is scheduled to be complete in June 2008.
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Water
Reclamation Plant No. 4 Expansion, Coachella Valley Water
District, Coachella, CA
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As Prime Consultant, LEE & RO has been providing engineering,
design and construction management services for two separate
projects at Water Reclamation Plant No. 4: (1) the $17 million
Phase 4 Plant Expansion project, increasing treatment capacity
from 6.9 to 9.9 mgd, and (2) the $4 million Chlorination &
Dechlorination (C&D) project (for the 9.9 mgd capacity). The
C&D project construction was complete and has been in
operation since June 2006 and the Phase 4 Plant Expansion project
construction is 95% complete and is in the start-up and
commissioning phase.
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| Rehabilitation
and Modification of Seven Anaerobic Digesters, Wastewater
Treatment Plant No. 2, Orange County Sanitation District, Fountain
Valley
, CA
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| As Prime
Consultant,
LEE & RO prepared a preliminary design report, plans and
specifications, in addition to providing construction support
services for an $11 million digester project for the 276 mgd
plant. Plant No. 2 has
a total of twenty digesters (each are either 80 feet or 105 feet
in diameter with 30 feet side water depth). The project scope
included rehabilitation of seven digesters and four digester
control buildings. Project
elements included process system upgrading, piping and valve
modifications, improvements to electrical and control systems,
addition of sludge flowmeters, improvements and replacement of
sludge and digester gas piping, SCADA and automation, digester
roof insulation, and structural rehabilitation. This $11 million
rehabilitation project construction was completed in 2003.
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Water
Quality Control Plant MBR Process Studies, City of Riverside, CA
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As Prime Consultant, LEE & RO authored a membrane bioreactor (MBR)
feasibility study for the 40 mgd wastewater treatment plant, which
consists of two activated sludge plant trains.
The objective of the MBR study was to find the most cost
effective alternative to expand the treatment plant capacity from
40 to 50 mgd. The
scope of work included evaluation of available MBR technologies,
development of MBR design criteria, construction cost estimate,
and a preliminary site adaptation plan. The study reviewed the
capacities of the unit processes and recommended that the City
convert portions of the Plant 1 activated sludge to a MBR process
at an estimated construction cost of $55 million.
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| Wastewater
Treatment Plant Expansion, City of Holtville, CA
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| As Prime
Consultant, LEE & RO was responsible for process analysis,
planning, and preparation of an engineering report for the
City’s treatment plant expansion from 0.8 to 2.2 mgd. The
secondary NdeN processes under study included conventional
activated sludge, oxidation ditch, single-cell activated sludge (Biolac),
and SBR. The treatment processes also include new headworks,
filtration, and UV disinfection. The total project cost for the
2.2 mgd NdeN plant is estimated at $11 million. The
study is complete and the final design is scheduled to start in
June 2008.
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Rehabilitation
of Primary Clarifiers and Odor Control Systems, Wastewater
Treatment Plant No. 2, Orange County Sanitation District, Fountain
Valley, CA
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As the Principal Subconsultant (35% share of contract value) to
Malcolm Pirnie, LEE & RO is responsible for electrical and
instrumentation and control (I&C) system engineering and
design for a $55 million plant rehabilitation project at 274 mgd
Plant 2. Under this project, all fourteen 140-foot diameter
primary clarifiers, seven primary sludge pump stations, and the
North and South Scrubber Complexes will be refurbished and
upgraded. The design was completed in February 2007 and
construction began in June 2007.
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| Water
Reclamation Plant Phase 1 and Phase 2 Expansion, City of Angels
, CA
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| As Prime
Consultant, LEE & RO was responsible for the planning, design
and construction management services for the $3.5 million Phase I
and the $4.5 million Phase II Expansion projects to process
the wastewater generated from this fast growing community. These
$8 million expansion projects include new grit removal, sequencing
batch reactors (SBRs), a blower building, a Title 22 chlorination
system, aerobic digestion, and various utility and site
improvements. Construction
was completed in 2003 for Phase I and in 2006 for Phase II.
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Wastewater
Treatment Plant, Cyanide Engineering Report, City of Calipatria,
CA |
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The
City was experiencing violations of waste discharge requirements
by exceeding the free cyanide discharge limitations of their NPDES
permit at their 1.9 mgd capacity wastewater treatment plant.
As Prime Consultant, LEE & RO reviewed cyanide analysis
procedures and protocols, as well as the cyanide source
identification and characterization. LEE
& RO provided a comprehensive investigative report identifying
potential cyanide sources, investigation of potential free cyanide
formation within the plant’s treatment processes (e.g.
chlorination & dechlorination), detailed review of free and
total cyanide analysis protocols, and sampling and analysis to
generate independent data. The
report recommended improved sampling and analysis procedures and
implementation of industrial service (external source) controls. |
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| Headworks
Replacement,
Hill Canyon
Wastewater Treatment Plant, City of Thousand
Oaks, CA
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| As a
Prime Consultant, LEE & RO is responsible for the design and
construction phase services for the rehabilitation of the North
Headworks at the 15 mgd wastewater treatment plant.
Project components include replacement of screens and
screenings compactor, new grit pumps, new grit classifier and
washer, as well as various piping and control improvements.
The project also includes the replacement of piston-type
primary sludge pumps with progressive cavity or gear pumps.
The design is scheduled to be complete in May 2008.
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| Trancas
Water Pollution Control Plant (TWPCP), Los Angeles County
Department of Public Works, CA
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TWPCP, built in 1963,
consists of the headworks, influent pump station, primary
clarifiers, rotating biological contactor (RBC), aerobic digester,
sand filters, and effluent leachfields.
As Prime
Consultant, LEE & RO upgraded the 0.3 mgd plant, prepared
an engineering report and assisted the County in securing State
Revolving Fund (SRF) financing.
Plant upgrades includes the headworks, influent pump
station, equalization basins, extended air aeration activated
sludge with anoxic selectors, dual media filters, and
chlorination. The design of the $3.9 million project was completed
in 2006 and the construction is scheduled to be complete in early
2008. LEE & RO also designed monitoring wells and provided the
ground water quality monitoring services.
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| Wastewater
Interceptor Sewer Odorous Air Treatment Facilities, City of Los Angeles,
CA
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As the Principal Subconsultant (25% of contract value) to Black
& Veatch, LEE & RO is responsible for preliminary design,
final design and construction support services relative to the
mechanical, electrical, and instrumentation systems at the seven
(7) Odorous Air Treatment Facilities (ATFs) for City of Los
Angeles’ East Central Interceptor Sewer, Northeast Interceptor
Sewer, and North Outfall Sewer. Two
ATFs are under construction and five ATFs are under design.
The total construction value of the seven ATFs is
approximately $50 million.
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