South Fork WT Plant Tour 5/1/2007 South Fork WT Plant Tour 5/1/2007

Water Source: The Clackamas River

Tour Guide Mark Cage South Fork WT Plant S Hunter Ave. Oregon City, Oregon 97045, (503)

The Control Room: Where all Plant data is recorded The Control Room: Where all Plant data is recorded

SCADA Supervisory Control And Data Acquisition

SCADA Stats: Plant during tour is running at 10.3 MGD Plant during tour is running at 10.3 MGD Plant runs at approximately 6 MGD in Winter, 18 MGD in Summer Plant runs at approximately 6 MGD in Winter, 18 MGD in Summer Current Alum dosage at 4.5 parts in the Rapid Mix Current Alum dosage at 4.5 parts in the Rapid Mix Pre-feed Polymer #LT7990 dosage at.8 parts Pre-feed Polymer #LT7990 dosage at.8 parts Plant during tour is running at 10.3 MGD Plant during tour is running at 10.3 MGD Plant runs at approximately 6 MGD in Winter, 18 MGD in Summer Plant runs at approximately 6 MGD in Winter, 18 MGD in Summer Current Alum dosage at 4.5 parts in the Rapid Mix Current Alum dosage at 4.5 parts in the Rapid Mix Pre-feed Polymer #LT7990 dosage at.8 parts Pre-feed Polymer #LT7990 dosage at.8 parts

Pilot Filters: Conveniently located in the Control Room Dual media filters 4’ Anthracite coal 1’ Garnet sand

Pilot Filters: Miniature replicas of the main filters Miniature replicas of the main filters Sampled daily Sampled daily Help avoid plant shut down Help avoid plant shut down Save about ½ hour per day on the work load Save about ½ hour per day on the work load

Stream Current Monitor Optimizes coagulant dosage

Chlorine Spikes or “Slugs” Plant start-up causes 5 minute chlorine spike Plant start-up causes 5 minute chlorine spike Spike goes down as plant comes on-line Spike goes down as plant comes on-line

Rapid Mix Injection Order: Polymer Alum Pre-Chlorination with Sodium Hypochlorite Flash Mixed by use of pump turbulence, (no mechanical mixing takes place) Factoid: One pound Liquid Alum equals 5.3 LBS of dry Alum Polymer Alum Pre-Chlorination with Sodium Hypochlorite Flash Mixed by use of pump turbulence, (no mechanical mixing takes place) Factoid: One pound Liquid Alum equals 5.3 LBS of dry Alum

Polymer Delivery Polymer Delivery Pretreatment #LT7990 dosage at.8 parts #LT7990 dosage at.8 parts

Current Alum dosage at 4.5 parts in the Rapid Mix Current Alum dosage at 4.5 parts in the Rapid Mix Pretreatment Alum Pumps

Alum Tank Corrosive Material Post welded measurements Pretreatment

Pretreatment: Sodium Hypochlorite Chlorine Pre-feed at 0.7 Chlorine Residual at 1.0 Chlorine Pre-feed at 0.7 Chlorine Residual at 1.0

Pretreatment Rapid Mix well Alum Chlorine Alum, Polymer and Sodium hypochloritee Polymer

Flocculation Chamber with Serpentine Baffles

Sedimentation/Contact Basin

$100 Plastic Tube used to prevent wave vibration caused buy pumping – Savings: $100,000 in repairs!

Dual Media Filter: 4’ Anthracite Coal - 1’ Garnet Sand.4’ Anthracite Coal - 1’ Garnet Sand. Backwash after approximately 70hrs depending on turbidity.Backwash after approximately 70hrs depending on turbidity. Filter Aid Polymer is used.Filter Aid Polymer is used. Flow approximately 2000 GPM during tour.Flow approximately 2000 GPM during tour.

View of Pipe gallery While Standing over Clear Well (.55 Million Gallons)

Sodium Hypochlorite Generation: Injection of salt water reacts with 700 amps of electricity and titanium plates. Produces 600 lbs 0.8% NaOCl per day (300 lbs per cell). Disinfection:

Sodium Hypochlorite Generation: Injection of salt water reacts with 700 amps of electricity and titanium plates. Produces 300 lbs 0.8% NaOCl per day. Two cells= 600 lbs On-site Generation of Disinfectants (OSG)

Hydrogen bubbles Anode Cathode 2Cl - >> Cl 2 + 2e- 2H 2 O + 2e->>H 2 + 2OH- NaCl + H 2 O >>>NaOCl + H 2 HOCl + OH->>H 2 O +OCl- cell Water Softener Brine tank

On-site Generation of Disinfectants (OSG) Advantages: Operator safety: No toxic chlorine gas handling, safety and regulation Greener solution: No chemical shipments (all you need is pure NaCl) Minimal storage

On-site Generation of Disinfectants (OSG) Disadvantages: Hydrogen gas generation: Toxic, colorless, flammable (vent) regulation Need steady water composition and have to soften water Cell maintenance: Need to wash with muriatic acid (HCl)

Chlorine Meters

Chlorine Stats: Chlorine Pre-feed at 0.7 Chlorine Residual at 1.0 Chlorine Pre-feed at 0.7 Chlorine Residual at 1.0

High Turbidity: The technique used at South Fork for dealing with extremely high turbidity is to use both Polymer and Alum in increased dosages.

Soda Ash Delivery Dry hopperDry hopper Lead and Copper RuleLead and Copper Rule

Soda Ash mixer

Soda Ash in bags used for pH adjustment

End