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LCWD Board Meeting

January 14, 2014

1680 Carneros Avenue, Napa

Los Carneros Water DistrictLos Carneros Water District

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Today’s Presentation

Present the Recommended Project – Then and Now

Discuss the Modeling Effort

Present the Preliminary and Final Design Scopes and Status

Discuss Construction Management Expectations

Present Next Steps

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Alternative 5 Future was the Recommended Project

Served majority of District/acreage – 5,619 ac

Lowest cost alternative

Addressed most severe groundwater area – Los Carneros Ave.

Eliminated District storage and pumping

Incorporated a water management strategy

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Alternative 5 Future Pipeline Route

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September 2012 Changes:

SCWA/SVCSD will be sending recycled water to the Napa Marsh and some parcels within District boundaries for a limited time

This change affected just over 1,000 acres New project definition: Parcels connecting to the

SCWA pipeline are removed from the LCWD system, lines are resized for the reduced demand

Alt 6A was the updated recommended alternative Now, it’s a modified Alt 6A

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Alternative 6A Selected by the LCWD Board in December 2012

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Alternative 6A – Then…

RW Service StatisticsAlternative

6A

Demand (AFY) 1,465

Gross Areas Served (acres)

4,614

Number of LCWD Parcels Served

112

Number of Other Parcels Served

18

Total New Pipeline (miles)

9.1

Total Capital Cost $16.1 M

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Basis of Design – Now…

RW Service StatisticsAlternative

6ABasis of Design

Demand (AFY) 1,465 1,347

Gross Areas Served (acres)

4,614 4,511

Number of LCWD Parcels Served

112 106

Number of Other Parcels Served

18 18

Total New Pipeline (miles)

9.1 9.1

Total Capital Cost $16.1 M $16.1 M

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Irrigation Assumptions

Description CriteriaVineyard Demand Factor 0.33 AFY/acre

Landscaping Demand Factor 2.5 AFY/acre

Storage Off-stream only, filled in winter over 1 month (1)

Vineyard Irrigation hours (Summer) 6am – 6pm

Landscape Irrigation hours (Summer) 6pm – 6am

Summer storage filling 6pm – 6am

Winter storage filling 24 hours per day

Note: (1) Winter storage reservoirs will be filled in March because the cost of recycled water is expected to be less expensive at that time.

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Hydraulic Design Criteria

Description CriteriaDelivery Pressure – NSD, Summer and Winter 105 psi

Minimum Turnout Pressure 20 psi(1)

Pipeline Design Pressure 150-psi operating, 225-psi max

Maximum Pipeline Velocity 5ft/sec

Maximum Pipeline Headloss

(Diameter <= 12-inches)

10 ft/1,000 ft

Maximum Pipeline Headloss

(Diameter > 12-inches)

7 ft/1,000 ft

Pipeline Roughness (C Factor) 130

Design Condition Peak Hour

Note: (1) Most turnouts will see a minimum pressure of 50-psi. The exception is along Neuenschwander Road where pressures in the system could fall to 20 psi during peak irrigating times.

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Hydraulic Model Demonstration

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Preliminary Design Scope

Finalize Alignments (Carollo)

Surveying (Mountain Pacific)

Potholing (Nielson Construction)

Geotechnical Investigation (RGH)

Corrosion Investigation (JDH Corrosion)

Funding Summary Assistance (Carollo)

Environmental Services (Bowker and Brown)

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Survey Status (Mountain Pacific)

Topographic Surveys are Complete

Utility Surveys are Complete

Resolved datum conflicts between new survey and Stanly Ranch topography.

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Potholing Status (Nielson Construction) Potholing Activities are Complete

• RW Pipeline will be crossing:

• Two 26” Steel High pressure Gas lines

• One 24” Steel High pressure Gas line

• Two 16” Steel High pressure Gas lines

• One 12” Transmission Gas Main

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Geotechnical Status (RGH)

Geotechnical Borings are Complete

Soil Testing is Complete

Draft Geotechnical Report Delivered – to be considered mainly for pipeline design and installation conditions.

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Corrosion Investigation Status (JDH)

Chemical Analysis is Complete

Draft Corrosion Report Delivered

• Soils are severely to mildly corrosive – this was expected

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Environmental Status (Bowker and Brown) Initial Study and Mitigated Negative

Declaration (IS/MND) – released Dec 2013

Publically noticed for 30 days: Dec 19 – Jan 21

Review on line at District’s web page and Napa County Library

To date: 1 Comment Letter received from Caltrans – traffic and encroachment

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Funding Status Submitted 2 of 4 SRF low interest loan

packages – general and technical (1/10/14)

Financial, and environmental packages to follow next

Last year grant funds were available too and distributed among the loan applicants – no additional application is needed

When the financing is approved, the SWRCB staff also look at grant funds available and apply what they can

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Construction Management Considerations/Expectations Only one buried utility - gas

River Crossing – have obtained the bridge drawings from the County

Culvert Crossings – will develop a few standard details

Consider environmental considerations

Pavement considerations

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Historic crossing should use raised depth crossing

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Culvert crossings will require a combination of deep undercrossings and concrete encasements

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The contractor needs to be maintain responsibility for utility coordination

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Protecting trees will be a potential issue for the contractor

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Final Design/Next Steps Develop preliminary plans, specs, details

(75% complete)

Design Coordination w other Agencies (NSD, SWRCB, County, etc)

ROW Acquisition/Permitting assistance

Funding application assistance

Bid Phase services

Timing: Jan – May 2014

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Thank You!

Questions…