Pasadena Water and Power · 2017-09-20 · Pasadena Water and Power Arborist Report 8 • 160 trees...

Pasadena Water and Power

Pasadena Non-Potable Water Project

Public Meeting

Pasadena Water and Power December 6, 2016

Pasadena Water and Power

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Pasadena Non-Potable Water Project Phase 1

• Supply - 700 AFY • Customers - 4 • Pipelines - 5 miles • Reservoirs - 2, 1 in Glendale • Pressure reducing station - 1 • Upgrades to Glendale pumping

system

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Community Concerns During EIR

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• Linda Vista Community > Impact to Canary Island Pine trees on Laurel Street > Cost increase due to buried utilities > Disruption to residents

• Sheldon Area Community > Disruption to residents

• Feb 22, 2016 - EIR Public Hearing > City Council directed staff to evaluate two alternative

pipeline routes

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Discussion Topics

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• Alternative Routes – reputable consultants > RMC - pipeline evaluation and environmental > ESA - arborist report > W. A. Rasic Construction - costs and schedule > Amec Foster Wheeler - geotechnical review

• Grant application > Archaeological report > Gnatcatcher survey

• Basin Salt & Nutrient Management Plan

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1. Alignment evaluation technical memo > Contractor’s cost estimate & schedule > Geotechnical engineering review

2. Arborist report 3. Environmental evaluation of the

alternatives - CEQA memo 4. Archaeological testing report 5. Gnatcatcher survey

Reports Available Online - October 31, 2016

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Alternative Pipeline Routes Map

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Arborist Report

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Certified Senior Arborist with extensive experience • Tree assessments, health risk

assessments & tree appraisals

• Expert witness testimony

• Services to cities of Los Angeles, Malibu, Calabasas, Agoura Hills, Thousand Oaks, Santa Clarita, Commerce, to counties of Los Angeles, Ventura, and San Luis Obispo

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Arborist Report

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• 160 trees surveyed with canopies within 30 feet of pipeline

• Tree rating based on distance to pipeline, exposed surface roots, lifting of soil and pavement, leaning

• Roots seek water, oxygen, nutrients and soil space

• Most roots grow in top 18” soil

• Approved West Route - 58 trees

• Alternative West Route - 37 trees

• Less than 3% roots in trench zone

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Rendering of Laurel St. Looking East

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Arborist findings - including the Canary Island Pine trees on Laurel • Canary Island Pines not impacted • Trees Less than 3% of the tree roots

expected in the trench zone • Tree roots limited in roads - soil

compaction, lack of water & oxygen • More trees along the approved

routes (58 vs. 37)

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• Environmental impacts of the Approved & Alternative Routes less than significant > Temporary issues: noise, traffic, dust, limited

access to properties during construction > Approved route impacts residents > Alternative route impacts recreational users near

Rose Bowl

• If Alternative Route Selected

> CEQA will have to be revised and approved by City Council - 4 to 5 months process

Environmental Evaluation - CEQA Memo

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• Cost estimates factor in: > Limited work hours (some streets): 8:30 am - 3:30 pm > Tree and tree roots > Existing utilities and residential services

• Approved west route - 2,900 feet > $1.32 million - estimated cost

• Alternative west route - 5,200 feet > $2.23 million - estimated cost

Contractor’s Estimates West Routes

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Minimize Pipeline Construction Impacts

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• Location of utilities during design • Contractor will locate utilities &

services prior to pipeline excavation • Adjusted design before construction • Experienced contractor • Full-time construction inspection • Full-time certified arborist • Advanced notices to residents • Limited work hours in small streets • Construction Staging and Traffic

Management Plan • Noise and dust control

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Geologic Hazards - Liquefaction

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• Alternative Route - longer pipeline in potentially liquefiable zones > Liquefaction - saturated

loose sandy soils can lose strength during an earthquake that causes settlement of the ground

> Storing water behind Devil’s Gate Dam may increase water table

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Construction Impacts

• Approved West Route > 10 weeks > Temporary impact to residents’ driveways - 1 to

3 days

• Alternative West Route > 14 weeks > One lane accessible for vehicular and bicyclists

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Alignment Evaluation Summary West Routes

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Evaluation Criteria

Linda Vista Community

Approved Route

Alternative Route

Environmental Impacts = = Potential Impacts to Trees (& Canary Island Pines) + Geohazard Conditions - Liquefaction + Construction Challenges + Capital Cost * + Operations and Maintenance Cost + Schedule Impact + Potential Loss of State Funding + * The alternative route is more costly than the approved by ~$1 million Overall the Approved Route in the EIR is superior to the Alternative Route + Indicates the better option

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Other Reports

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• Archaeological report > 5 trenches > 3 professional archaeologists > 7 letters sent out > 3 Native American monitors

¤ Andrew Salas, Gabrielino Band of Mission Indians - Kizh Nation ¤ Adrian Morales, Gabrielino Tongva San Gabriel Band of Mission

Indians ¤ Robert Dorame, Gabrielino Tongva Indians of California

> Findings: no prehistorical artifacts or features found

• Gnatcatcher survey - no gnatcatchers > Pre-construction surveys required

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Raymond Basin Salt & Nutrient Management Plan

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• Raymond Basin Salt & Nutrient Management Plan > Assimilative Capacity (AC) = Objective limit – Existing conditions > State – A single project is not to exceed 10% of the AC > Up to 10% of salt & nutrient (“load”) in recycled water is projected to

reach the water table > AC for the Monk Hill Sub-basin is 225 acre feet per year (AFY) of load

& the Pasadena Sub-basin is 405 AFY of load

• Pasadena Non-Potable Water Project > Project buildout will provide 2,700 AFY for irrigation, 400 AFY in the

Monk Hill & 2,300 AFY in the Pasadena Sub-basin > Ten percent of the load or 40 AFY in the Monk Hill & 230 AFY in the

Pasadena Sub-basin will reach the aquifer which is less than the AC limits for each sub-basin

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Two Community Meetings

• Today, December 6, 2016 at 6 p.m. > Pipeline route: Linda Vista Ave., Laurel St., Parkview Ave. or

(alternative route) Salvia Canyon, West Dr.

• Thursday, January 12, 2017 at 6:30 p.m. > Pipeline route: Arroyo Blvd., Rose Bowl Dr. or (alternative

route) Rosemont Ave.

> Location: Brookside Golf Club, Arroyo Room

• Five reports available at: http://cityofpasadena.net/waterandpower/recycledwater/

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Questions?

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Pasadena Non-Potable Water Project