LCWDBoardMtg_ pptx/1 LCWD Board Meeting January 14, Carneros Avenue, Napa Los Carneros Water District

LCWDBoardMtg_ pptx/2 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

LCWDBoardMtg_ pptx/3 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

LCWDBoardMtg_ pptx/4 Alternative 5 Future Pipeline Route

LCWDBoardMtg_ pptx/5 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

LCWDBoardMtg_ pptx/6 Alternative 6A Selected by the LCWD Board in December 2012

LCWDBoardMtg_ pptx/7 Alternative 6A – Then… RW Service Statistics Alternative 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

LCWDBoardMtg_ pptx/8 Basis of Design – Now… RW Service Statistics Alternative 6A Basis of Design Demand (AFY)1,4651,347 Gross Areas Served (acres) 4,6144,511 Number of LCWD Parcels Served Number of Other Parcels Served 18 Total New Pipeline (miles) 9.1 Total Capital Cost$16.1 M

LCWDBoardMtg_ pptx/9 Irrigation Assumptions DescriptionCriteria Vineyard Demand Factor0.33 AFY/acre Landscaping Demand Factor2.5 AFY/acre StorageOff-stream only, filled in winter over 1 month (1) Vineyard Irrigation hours (Summer)6am – 6pm Landscape Irrigation hours (Summer)6pm – 6am Summer storage filling6pm – 6am Winter storage filling24 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.

LCWDBoardMtg_ pptx/10 Hydraulic Design Criteria DescriptionCriteria Delivery Pressure – NSD, Summer and Winter105 psi Minimum Turnout Pressure20 psi (1) Pipeline Design Pressure150-psi operating, 225-psi max Maximum Pipeline Velocity5ft/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 ConditionPeak 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.

LCWDBoardMtg_ pptx/11 Hydraulic Model Demonstration

LCWDBoardMtg_ pptx/12 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)

LCWDBoardMtg_ pptx/13 Survey Status (Mountain Pacific)  Topographic Surveys are Complete  Utility Surveys are Complete  Resolved datum conflicts between new survey and Stanly Ranch topography.

LCWDBoardMtg_ pptx/14 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

LCWDBoardMtg_ pptx/15 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.

LCWDBoardMtg_ pptx/16 Corrosion Investigation Status (JDH)  Chemical Analysis is Complete  Draft Corrosion Report Delivered Soils are severely to mildly corrosive – this was expected

LCWDBoardMtg_ pptx/17 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

LCWDBoardMtg_ pptx/18 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

LCWDBoardMtg_ pptx/19 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

LCWDBoardMtg_ pptx/20 Historic crossing should use raised depth crossing

LCWDBoardMtg_ pptx/21 Culvert crossings will require a combination of deep undercrossings and concrete encasements

LCWDBoardMtg_ pptx/22 The contractor needs to be maintain responsibility for utility coordination

LCWDBoardMtg_ pptx/23 Protecting trees will be a potential issue for the contractor

LCWDBoardMtg_ pptx/24 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

LCWDBoardMtg_ pptx/25 Thank You! Questions…