West Linn, OR October 27, 2011

0 20’ 40’ 80’

ADMIN/OPS BUILDING

REFURBISHED OPS BUILDING

WW EQUALIZA-

TION & RECOVERY

AREA

FILTERS

OZONEGENERATOR

DEWATERING BUILDING

GRAVITYTHICKENERS

EXISTING LAGOONS

CHEMICALBUILDING

HSPS

CLEARWELL

BALLASTED FLOCCULATION

ELECTRICAL/GEN-ERATOR MAINTENANCE

BUILDING

Entry Plaza & Demonstration Area

Right-of-way

Plant Staff Roof Garden

Emergency Access Road/Public Trail

Trail secured access

Native Woodland Screen

Project Boundary

Native Woodland Screen

Flex-space forMaterials Laydown

StormwaterDetention Area

StormwaterDetention Area

Half “Green Street” Improvements

Half “Green Street” Improvements

Right-of-way

Decorative low wall for Screening (from

re-used material)Accent Tree Row

Flowering Trees

Raw water pipeFresh water pipe

Road/Trail with secured access

KENTHORPE WAY

MAPLETON DRIVE

RIVR I VR I VVVI VVVVVVVVVVVVVVVVVVVVVVR I VI VI VVVVVVVVVVVR I VI VVVVVVVVVVVVVVVVVVVVVVVR I VR I VVR I V REEEEEREEEEREEEREREERRRRRRRRREREEREREREREERERRRRRRRREREREEREEREERERRERERRERERRERRRERERERRERERRERERERERER ER ERRRREREEERERER RRRRREEEER ER ERREEREREERERREREERRRREERRREEEERER RRRRPPAPAPAPARARPARARAARAPARPARARPARPARPARPARPARPARRPPARRRRRPPAPPARRARARAPAAPARPARPARRPARPARRRPPPPARPARRRAAPARPARPARPARPARRRRRPPPARARARPARRRPARPPAPPARPARRPARPARRRPPPAPAPPPARAPARPARPARRPARRRRPAAARAAARRARPARRRRPPAPARPARPARPARPARPARARPARPARRRRPARPPARPARARARAPARRARRRRRRPARPARAAARAARPARRRRRPPPPPPARPARRARRRPPPPPPARPARRRPPPPAPARRARPARRPARRRPPPPP RRPPPP RRRRRRRRRP RRRRRPPPPPPPPPPP RPPPPP RPP RPA KWAKWKWAKWAKWAKWAKWAKWAWAWAKWAKWAKWAKWWWAKWAKWAKWKWAKWAAKWAKWAKWAKWAKWAWWWAWAKWAKWAWAWWAWAKWAKWAWWWWKWAWWWWAAKWAWWWWAWAWAKWAKWAKWAKWAKWAWAWAWWWAAKWAKKWKWAWWWWWWWWWWAWKWAKWAKWAWAWWWWKWKWWKWWWWKWAAKKWAKWAKWAKWAKKWAKWAKWAWAWKWWWKWWKWKWWWWKKKWAKWAKWAKWAKWAWWKWAWKWAKWKWAKWKWAKWAKWWWAKKKKKWAKWAWAKWAKWAKWAKWAKWAKWAWWAWKWAKWAKWAAKWKKWAKKWAKWAKWAKWAKWAKWAKWAKWAKWKWAKWWWWWWWAKWAKWAKKKWKKKWWKWKWAKWAWWWAKKWKWAKKWWWWKWAKWAKWAWWKWAKKWWWWKWAKWAWWWWKWAKKWAKWAWWWWKWAWWWAKKWAKWAWWWWAKWAWAAKWAKWAWKWAWAAAAKWAKWAKKWAWWAKWAWAAKWAAKKWAKWKKWKWKWKWAKWAWKWAAKWAAAAKKWAKKKWKWKWWWWWKWAKWAKWWKWAKKKKWAKWAKKWKKKWAWWWWAKWAKWAKWWAKWAKWAWAWWAKWAWKWAKWAKWAWAKWAWKWAKWKWAKWAKWAWKWWAKWAWKWAWAAWKWK YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY

SSSSSSSSSSSSSSSSSSSSS

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76

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32

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LAKE OSWEGO - TIGARD WTP EXPANSION PROJECT | Conceptual Site Plan

5

West Linn, OR October 27, 2011

Kenthorpe Stormwater Garden Water Treatment Plant Entry Area

Kenthorpe Way “Green” Street Improvements

1

2

31

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7

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5

8

3 4 7 8

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9 10

1110

0 5’ 10’ 20’

AA’

LAKE OSWEGO - TIGARD WTP EXPANSION PROJECT | Focus Area | Kenthorpe Entry Area

A

ROW

SECTION

6

4

11

ADMIN/OPS BUILDING REFURBISHED OPS BUILDING

KENTHORPE WAY

Stormwater swale

RampStormwater swale crossingStormwater swale

Water feature

Existing tree

Existing View

Existing View

Picnic niche

Tree preservation seat wall

Steps

Vegetation Screen

Stormwater detention

area

West Linn, OR October 27, 2011

Mapleton Orchard

Mapleton Drive “Green” Street Improvements

1

1

2

25

53

3

4 6

6

B

C

0 10’ 20’ 40’

Trail/Emergency Access

BB’

CC’

LAKE OSWEGO - TIGARD WTP EXPANSION PROJECT | Focus Area | Mapleton Orchard

ROW

SECTION

SECTION

4

EXISTING LAGOONS

HSPS

BALLASTED FLOCCULATION GRAVITY THICKENERS

MAPLETON DRIVE

Security wall

Stormwater detention area

Existing tree

Trail

Emergency access route

Accent tree

Secured Trail/Road Access

Split-rail fence

Stormwater swale

Raw water pipeFresh water pipe

Low site wall from re-used concrete

Native Woodland

Meadow Clearwell(Underground)

Vegetation Screen

Existing View

West Linn, OR October 27, 2011LAKE OSWEGO - TIGARD WTP EXPANSION PROJECT | Vignettes

Front Entry Area

West Linn, OR October 27, 2011

Mapleton Trail/Emergency Access

LAKE OSWEGO - TIGARD WTP EXPANSION PROJECT | Vignettes

West Linn, OR October 27, 2011LAKE OSWEGO - TIGARD WTP EXPANSION PROJECT | Vignettes

Kenthorpe Operations Entrance

West Linn, OR October 27, 2011LAKE OSWEGO - TIGARD WTP EXPANSION PROJECT | Vignettes

Kenthorpe Pedestrian Entrance

West Linn, OR October 27, 2011LAKE OSWEGO - TIGARD WTP EXPANSION PROJECT | Vignettes

Kenthorpe Stormwater Area

West Linn, OR October 27, 2011

Good Neighbor Fence Re-used concrete for Low Site Wall Dry-stacked stone for Tree Preservation Wall

Split-rail Fence

Split-rail Fence Split-rail Fence

Good Neighbor FenceView from Plant Side of Fence View from Plant Side of Fence

Good Neighbor Fence w/ Security Mesh High Site Wall + Gate Lumber Screen

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4

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LAKE OSWEGO - TIGARD WTP EXPANSION PROJECT | Site Security + Screening

Fencing Walls + Screens

Not to Scale

West Linn, OR October 27, 2011

Stormwater Treatment - Vegetated Swale, Kenthorpe

Green Roof - Extensive

Stormwater Detention Area

Stormwater Treatment - Vegetated Swale, Grass

Pervious Paving - with adjacent Vegetated Swale

Stormwater Detention Area

Green Roof - Intensive Roof Garden

Stormwater Treatment - Vegetated Swale, Mapleton

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6

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5

7

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5

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6

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LAKE OSWEGO - TIGARD WTP EXPANSION PROJECT | Stormwater Design

West Linn, OR October 27, 2011

Kenthorpe Way Looking WestKenthorpe Way Looking East

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5 4

3

View Along Eastern Side of Property

Wooded Area within Western Property Boundary

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3

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Looking West along Mapleton DriveLooking North from Southwest CornerView from Private Property on West Side

View Out from East Property Corner

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789

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Private Property on Northwestern Corner

LAKE OSWEGO - TIGARD WTP EXPANSION PROJECT | Surrounding Neighborhood

Southeast Property Corner View South along East Boundary

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2

11

5

KENTHORPE WAY

MAPLETON DRIVE

Not to Scale

1

11

West Linn, OR October 27, 2011LAKE OSWEGO - TIGARD WTP EXPANSION PROJECT | Existing + Proposed Condition

Not to Scale

KENTHORPE WAY KENTHORPE WAY

MAPLETON DRIVE MAPLETON DRIVE

Existing Proposed

Not to Scale

1 2 3

4 5 6

VIEW LOOKING SOUTH AT MAIN PUBLIC ENTRY VIEW LOOKING WEST AT MAIN PUBLIC ENTRY

PRIMARY MATERIALS MATRIX

NON-PROCESS BUILDING STUDY

1 2

8

4

5 6

BIRDS EYE VIEW OF SOUTH EDGE OF

PLANT SHOWING GARDEN ROOFS

SOUTH EDGE BUILDING WALL ARTICULATION STUDY

PRIMARY MATERIALS MATRIX

VISUAL SCREEN CONCEPT

PROCESS BUILDING CONCEPT

EXISTING PLANT CONDITIONS NEIGHBORHOOD AESTHETIC CONTEXT

NORTH ELEVATION OF NEW OPERATIONS BUILDINGREMODELED EXISTING BUILDING

S. Kenthorpe Way

Mapleton Dr.

Existing maintenance and truck loading area will now be located inside the plant, reducing associated impacts to neighbors.

All chemical deliveries are internal to plant facilities, screening associated visuals and noise. Delivery points are designed with spill containment measures.

Dewatered solids loading will now be contained within a new Dewatering Building, reducing associated noise.

Existing basins will no longer be used for solids drying. Current noise associated with solids drying activities (engines, “backup” beeping, etc.) will no longer be needed at the plant.

The remaining two lagoons will only be used during emergency operations.

Where possible, all equipment that is traditionally external to buildings (HVAC fans, mixer motors, etc.) will be located within buildings to reduce external noise.

PUMPSTATION

LIME SILO

SETT

LIN

G B

ASI

N

SETT

LIN

G B

ASI

N

SETT

LIN

G B

ASI

N FLASH MIX

raw water

PUMPSTATION

Coagulant and bleach are added.

CO2 and Powdered Activated Carbon are sometimes also added. Lime is

added to regulate the pH.

CLEARWELL(UNDERGROUND)

PUMPSTATION

PUMPSTATION

raw

wat

er

TO WATER CUSTOMERS

TO WATER CUSTOMERS CLEARWELL(UNDERGROUND)

pHADJUSTMENTBLEACH

Current Treatment Process

Future Treatment Process

SEDIMENT REMOVAL

COAGULANT

WASTE WATERLAGOONS

FILTERS

FILTERS

MECHANICAL SOLIDSDEWATERING

Benefits for West Linn

West Linn’s Water Supply

Oregon City and West Linn jointly own South Fork Water Board (serves

54,000 people).

Drinking water source: Clackamas River

Treatment plant located in Oregon City in the Park Place

Neighborhood. (Recently extensively upgraded and expanded).

Water delivered through a 24-inch transmission main suspended on

the I-205 Bridge.

Benefits of Partnership

Learn More!

Lake Oswego’s water treatment plant serves as West Linn’s sole

emergency and backup water source.

The water treatment plant cannot deliver emergency supply year-round unless it is expanded through

the partnership with Tigard.

West Linn’s Water Master Plan (2008) explains West Linn does not currently have adequate storage to

meet system-wide needs under emergency conditions.

Improving the intertie with Lake Oswego is identified as the least expensive option to meet storage

supply needs.

West Linn ratepayers would save millions of dollars by avoiding construction of a new 8.4 million gallon

reservoir.

A larger underground reservoir for treated water (a clearwell) at the plant will allow water to be fully

treated before it leaves the treatment plant – a key to providing high quality potable water to West Linn

residents when needed.

South Fork Water Board: http://www.sfwb.org

Information about the emergency water intertie with Lake Oswego:

http://westlinnoregon.gov/publicworks/information-about-emergency-water-intertie-lake-oswego-water-system

West Linn Water System Master Plan (2008) Table 6.3 System Wide Performance Requirement Summary

Year Maximum Daily Demand (mg)

Fire Flow (mg)

Total Supply Need (mg)

Normal Supply Capacity (mg)

Emergency Supply Capacity* (mg)

Normal Supply Deficit (mg)

Emergency Supply Deficit (mg)

Current 8.1 0.5 8.6 9.5 0 (0.9) 8.6

2015 8.6 0.5 9.1 9.5 0 (0.4) 9.1

2030 9.7 0.5 10.2 9.5 0 0.7 10.2

Development Saturation 10 0.5 10.5 9.5 0 1.0 10.5

*Emergency supply capacity is the total available capacity of the City’s Lake Oswego Emergency Intertie Pump Station, assumed to be 0 under maximum daily demand conditions.

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Water Treatment Plant Project Timeline

Lake Oswego · TigardWater Partnershipsharing water · connecting communities

GNP Development Period . . . . . . . . . . . . . . . . . . . . . . . . . . . Oct. 2010 – Dec. 2011

WTP Design Open House . . . . . . . . . . . . . . . . . . . . . . . . . . . Oct. 27, 2011

Required Land Use Application Public Meeting . . . . . . . . . Nov. 10, 2011

Land Use Application Submittal . . . . . . . . . . . . . . . . . . . . . Jan. 2012

Planning Commission Hearing . . . . . . . . . . . . . . . . . . . . . . . . Spring, 2012

Project Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Spring 2011 – Spring 2013

Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Spring 2013 – Summer 2015