This supplement was necessary because a supplement to the original facility plan of has been prepared which analyzes additional alter- natives for the City of Greeley. The original facility plan recommended a new activated sludge wastewater treatment plant located east of Greeley at the "Delta" site. This proposed plan resulted in considerable local opposition. This fact, coupled with much higher revised cost estimates, caused the City to obtain grant money from EPA to study additional alternatives.
In addition, EPA has recently been emphasizing alternative wastewater treatment systems. Four alternatives identified nine treatment processes for treating Greeley's wastewater.
They are: o Delta Mechanical Plant 12 mgd activated sludge plant o Treatment and Discharge to Crow Creek day lagoon with reservoir storage and discharge day lagoon with direct discharge 4-day lagoon with reservoir storage and discharge o Treatment and Discharge to Crow Creek and Ogilvy Ditch day lagoon with reservoir storage and discharge day lagoon with direct discharge 4-day lagoon with reservoir storage and discharge o Land Application System day lagoon with reservoir storage for irrigation 4-day lagoon with reservoir storage for irrigation This EIS addresses ten areas of public concern relative to the new study: treatment efficiencies, effluent quality, surface water quality, ground water quality, public health, odor, visual,, agriculture, land use and cost.
Findings related to these ten areas of concern are summarized in the following evaluation matrix. Primary and secondary treatment at First Ave. Primary and secondary treatment at Evans plant: 2 aerated lagoons provide simpler -. Third lagoon planned would improve efficiencies Primary and secondary treatment'o Hill's Park plant: 2 aerated' lagoons provide simpler operation.
Efficiency of treatment good. Operation is less complex than First Avenue plant, but requires knowledge of various treatment processes to achieve effluent quality requirements. Primary and secondary treatment.
