PROJ02008

• Contract/PO #: FS0073FX
• Contractor Name: Lamar, City of
• Contract Type: Grant
• Water District: 0
• Loan Projects - Doc Type: Feasibility Study

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Middle Well PumD Station (Phase 6) -
The Middle Well pump station will be located at the Riverside Park site adjacent to the
existing well water source. The water storage capacity of the pond at this location is
approximately 4.09 acre-feet. .Based on the preliminary hydraulic model, the pump
station at this location will provide approximately 710 GPM at a discharge pressure of 90
PSI.

East Well Pump Station (Phase 6) -
The East Well pump station will be located at the Riverside Cemetery site adjacent to
the existing well water source. The water storage capacity of the pond at this location is
approximately 9.98 acre-feet. .Based on the preliminary hydraulic model, the pump
station at this location will provide approximately 1,774 GPM at a discharge pressure of
90 PSI.

Aeration System

A common issue when using raw water for irrigation is the potential for poor water
quality, specifically algae blooms and odors. To prevent the problems associated with
poor water quality, lake bed aeration systems are recommended. Lake bed aeration are
used to pump and replace water in the pond on a consistent basis, thereby increasing
the rate of water turnover and reducing water stagnation and algae growth.

Lake bed aeration systems do not mechanically move the water or aerate it by spraying
it into the air. Rather, lake bed systems aerate ponds by bubbling air or a combination of
air and ozone through the water. Not only are these systems more efficient than systems
that mechanically move the water; they are also less expensive to operate. In these
systems, air moves through 3-inch slits in polyethylene tubing, which is weighted to the
bottom of the pond. The amounf and length of tubing and the compressor requirements
for ponds will depend on the volume and depth of water. Localized aeration modules can
also be used in lake bed aeration systems, where several modules may be used instead
of the weighted tubing.

The mechanical components required for the aeration system should be located in the
pump system building adjacent to the pond. These components include an air
compressor, air filters, flow meters, ozone generators, and a system timer. Maintenance
of the aeration system is required to keep the mechanical components in proper
operating condition. An overflow structure and pipe are typically designed for irrigation
ponds to convey excess water away from the pond rather than allowing it to spill over the
banks. This scenario may occur during heavy rainfall events or in the case where the
delivered water is more than required. The recommended discharge point for this system
is an existing open channel lateral or storm swale.

PumD System Enclosure

Each pre-fabricated pump system will be located within a building, installed on a
concrete slab. Typical pump buildings can be precast concrete "tilt-up" building, CMU
wall buildings, or wood frame buildings. The building will include adequate access for
maintenance including a roof hatch above the pumps and filters. Proper ventilation will
be required to keep the motors cool as well as to heat the exposed piping during
shoulder months when freezing conditions may exist.

Aqua Engineering, Inc.
and Colorado State University Secondary Supply Feasibility Study
May 19, 2004 -28-