CDM to Design-Build New Water Treatment Plant for Lawrence

... New plant will meet regulations and peak demands while creating space
for public park ...

LAWRENCE, Massachusetts--CDM has signed a $25.7 million design-build
agreement with the city of Lawrence to provide a new state-of-the-art water
treatment plant. Construction will begin this summer and be complete by the
end of 2006.

Among the project's highlights is an innovative and aesthetically pleasing
design and site layout that minimizes visual impacts and retains large
portions of the site--including the riverfront --for development as a public
park or other recreational facility. In addition, the use of design-build
provides Lawrence officials with a single point of responsibility;
compresses the project schedule, enabling the city to meet regulatory
deadlines; and paves the way for the creation of additional jobs within the
community as early as this year.

The 16-million-gallons-per-day (mgd) plant has been sized to meet the city's
maximum daily water requirements during the summer months--its peak demand
season--and will use a combination of proven treatment technologies to meet
both current and future drinking water limits. The treatment process
includes chemical addition and mixing, flocculation to condition the river
water for treatment, sedimentation to remove larger particulate matter, and
high-rate filtration to remove the remaining finest suspended matter. The
filters will contain granular activated carbon media, which is highly
effective in removing taste, odor, and color-producing compounds, and the
water will be disinfected using ultraviolet light and chlorine. Ultraviolet
disinfection, a relatively new process in the United States, is regarded by
the U.S. Environmental Protection Agency as one of the most effective
treatments against waterborne microbial disease.

As part of the project, CDM will design and build new clearwells, provide
for emergency power, and implement an automated instrumentation and control
system. CDM will also help the city in developing and implementing a
geographic information system and will provide hydraulic modeling services
that enable the city to prioritize any additional distribution system
improvements.

CDM is a full-service, global consulting, engineering, construction, and
operations firm helping public and private clients improve the environment
and infrastructure.

Visit us at www.cdm.com

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