Water Resources Director: Chris Graybeal

Our Mission

To promote and protect the environment, preserve natural resources, and ensure the

health and safety of our customers.

Jan Feb Mar Apr May Jun Jul Aug Sept Oct Nov Dec

BOD mg/l 4.8 3.3 4.1 10.6 4.4 5.4 6.1 5.7 1.3 3.5 3.3 2.4

TSS mg/l 14.1 8.3 9.5 16.8 11.9 6.6 11.0 12.0 4.6 5.5 3.7 4.9

BOD Limit 30 30 30 30 25 25 25 25 25 25 30 30

TSS Limit 30 30 30 30 30 30 30 30 30 30 30 30

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Granite Falls Wastewater Treatment Plant (WWTP)2017 Bio Oxygen Demand (BOD) & Total Suspended Solids (TSS) Results

BOD mg/l TSS mg/l BOD Limit TSS Limit

BOD & TSS are two of the main indicators of facility efficiency.

Average Influent BOD for 2017 Average Effluent BOD for 2017

306 4.6

Permit Limit: 25 / 30 mg/l

Average Influent TSS for 2017 Average Effluent TSS for 2017

144 9.1

Permit Limit: 30 mg/l

Overall TreatmentPlant Efficiency (Actual)

Rate Efficiency of Treatment Plan (Design)

96.25% 87%

WWTP Average BOD & TSS

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Monthly Average mg/l 0.3 0.2 0.2 0.2 0.2 0.2 0.5 0.20 0.20 0.2 0.2 0.20

Daily Maximum mg/l 0.99 0.37 0.76 0.2 1.06 0.2 0.65 0.45 0.20 0.31 0.2 0.25

Monthly Summer Limit 6.2 6.2 6.2 6.2 6.2 6.2 6.2

Monthly Winter Limit 15.4 15.4 15.4 15.4 15.4

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Granite Falls Wastewater Treatment Plant2017 Ammonia Nitrogen Results

Monthly Average mg/l Daily Maximum mg/l Monthly Summer Limit Monthly Winter Limit

Ammonia Nitrogen is also an indicator of the efficiency of the wastewater treatment process. Our facility operates well below the permitted limits for this chemical compound.

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Granite Falls Wastewater Treatment Plant2017 Fecal Coliform Results

Monthly Average #100ml Monthly Limit Weekly Limit

Fecal Coliform are pathogenic organisms that must be removed from our discharge in order to meet state and federal standards. We have consistently discharged significantly

less than our permitted limit.

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Granite Falls Wastewater Treatment PlantEfficiency % 1993-2017

DESIGN RATED EFFICIENCY: 87% ACTUAL 2017 EFFICIENCY: 96.25%

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TOTAL YEARLY FLOW 1987 - 2017*TOTAL FLOW IN MILLION GALLONS

There was an increase in discharge flow due to more rainfall events in 2017 which increased inflow and infiltration in the collection system.

The Granite Falls Wastewater Treatment Plant treated 126,326,000 gallons, or an average of 346,098 per day, of wastewater while meeting all effluent limitations in our permit. In 2017, our wastewater flow increased by 12.6% from 2016 due to more rainfall events. The facility achieved a 96.25% combined efficiency removal rate and is operating below the

permitted capacity.

Plant staff completed lab proficiency certification for field analysis during 2017. There were no compliance issues during 2017.

Upgrades were made to the chemical feed system with the addition of two new chemical feed pumps in the dechlorination building.

A new bulk material removal system was installed during the Wastewater plant upgrade to remove large debris at the headworks of the facility.

An additional sludge tank was added to the facility to expand sludge handling capabilities at the Wastewater Treatment Plant.

New eye wash safety showers were added in the chemical storage areas as part of the Wastewater Treatment Plant upgrade.

Monthly Water TreatmentPlant Flow

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Minimum Daily Flow

Average Flow Daily

Maximum Daily Flow

2016 & 2017 Flow Comparison

There was a 1.3% increase in water treated during 2017 due to construction and the July 2017 fire at One Putt.

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Chart Title

2017 2016

Water Treatment Plant Chemicals Used In 2017

Chemical Amount Used

Activated Carbon 0 lbs.

Aluminum Sulfate 19,891 gals

Chlorine (9.5 months) 16,597 lbs.

Sodium Hypochlorite (2.5 months)

1,677 lbs.

Fluoride 22,754 lbs.

Lime Slurry 24,275 gals

Polymer 721 lbs.

Potassium Permanganate 1,149 lbs.

Water Treatment Plant Improvements

Sludge handling capabilities were enhanced at the Water Treatment Plant which increased efficiency by allowing us to remove accumulated sludge during the

treatment process.

Water Treatment Plant Improvements

Polymer feed system pumps were upgraded to more efficient pumps.

Water Treatment Plant Improvements

A total transition from chlorine gas to sodium hypochlorite has improved employee safety.

Employee Commitment During Times of Crisis Water Department employees demonstrated their

dedication to the community and the Town by making themselves available to assist other departments during one of the largest fires in the history of the Town. Staff members also made themselves available during the tornado to ensure Water Department services continued for our customers.

Water Plant staff worked closely with emergency services to provide an uninterrupted flow of 1.5 million gallons of water during the fire without a loss of water pressure to our customers.

Water Plant staff reported for duty during the tornado event, even though some employees experienced damage to their personal property.

Training and Qualifications

All Water Resources staff obtained their mandatory six hours of continuing education to maintain their certifications.

One staff member obtained grade 2 wastewater certification.

Two water staff plant staff members were promoted to positions of ORC and Backup ORC.

All staff members attended required safety training.

In ConclusionOur Water Resources employees are operating bothfacilities at efficient levels. Drinking water andwastewater qualities continue to meet and/or exceedstate and federal standards. We will continue to providehigh quality of water to our customers, and return highquality water to the environment by the most efficientmeans available.