Water Treatment and Management- WATER TREATMENT PLANT

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The City’s Water Treatment Plant staff provides the day to day operation of the plant, 4 deep wells and responsible for the maintenance of the distribution system.

FACILITY:

Name:  Grinnell Water Treatment Facility

Owner:  City of Grinnell
Address:  927 4^th Avenue
City:  Grinnell
State:  Iowa
Zip:  50112
Phone:  641/236-2600

DESIGN CAPACITY:
Million Gallons/Day:  1.4 (daily average)   3.16 (daily maximum)
Population Equivalent:  14,000

NOW TREATING:
Million Gallons/Day:  1.215 (11/1998 – 11/1999)
Maximum Gallons/Day:  1,458,230
Population Equivalent:  12,156
Population Served:  8,902

WELLS:
#5 Well – located at 702 Main Street
#6 Well – located at 702 Main Street
#7 Well – located at 626 West Street
#8 Well – located at 1313 1^st Avenue

RESPONSIBLE OPERATOR(S)
Jan B. Anderson – Superintendent
Paul McDonald – Assistant Supervisor
James Brown – Operator
Harold Rose – Apprentice

GENERAL DESCRIPTION:
Water is derived from four Jordan aquifer wells.  Well #5 was drilled in 1920 to a depth of 2,220 feet.  Well #6 was drilled in 1926 to a depth of 2,500 feet.  Well #7 was drilled in 1955 to a depth of 2,500 feet.  Well #8 was drilled in 1974 to a depth of 2,510 feet.

Water treatment consists of forced draft aeration, detention of water in a 1.0 million gallon baffled detention tank (10-11 hrs.), softening through 4 Zeolite media softeners, caustic soda for pH adjustment, polyphosphate injection for corrosion control, and sodium hypochlorite disinfection.  The plant has the capacity to produce 3.2 million gallons of water per day.  Pressure and storage for the distribution system is provided by a 300,000 gallon elevated storage tower located south of the water plant.  The department has a standby diesel motors/generators to operate wells and high service pumps.

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