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Surface flow constructed wetland (two cells totaling 29,300 square feet) in combination with wild fowl lakes (24,885 square feet). Facility is located near Arapahoe, Wyoming at the existing wastewater lagoons.

The Design Conditions are:

1. Design Water Temperatures - Winter 34 F, and Summer 59 F
2. Average Annual Precipitation - 12 inches
3. Design Flow - Summer 96,000 gpd, Winter 16,560 gpd
4. Project Location - North of Lander, WY (Elevation 5,036 ft.)
5. Restrictions - High water table existing lagoons.

DESIGN OBJECTIVES - Develop a treatment unit to maintain BOD and TSS below 30/30 permit levels.

1. Provide Surface Flow Wetland Cells and Wildlife Lake - Meet Wyoming water quality permit levels.
2. Provide CETCO Geosynthetic Clay Liner for Existing Lagoon B -Bottom; Claymax 600cl: sides; Bentomat ST. Work with utilities staff to design surface flow wetlands and wild fowl habitat lakes.
3. Provide 30 mil PVC Liner at Wetlands - UV, 36 mil polypropylene on sides. Discharge is into the adjacent creek. Consideration had to be given to seasonal groundwater levels.

BENEFITS

• Construction Cost (1997): Wetland - $497,248; Wild Fowl Lakes - $234,905
• Land Consumption: only 3.85 acres.
• Habitat: conditions will support numerous wildlife species.
• Educational Forum: provides educational opportunities for local schools.
• Aesthetic Benefits: plants merge with existing riparian setting.