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Presentation by Dave Richardson, P.E. of RMC Water and Environment3, 4RMC '4e0 Central Contra ry District Sanitary District Recycled Water Wholesale Opportunities Central Contra Costa Sanitary District Real Estate, Environment, and Planning Committee October 6, 2015 Complex Challenges Innovative Solutions • Mgd Million gallons per day • MF Microfiltration • RO Reverse osmosis • AOP Advanced oxidation • CNWS Concord Naval Weapons Station • CCWD Contra Costa Water District • DERWA DSRSD -EBMUD Recycled Water Authority • EBMUD East Bay Municipal Utilities District • DSRSD Dublin San Ramon Services District • CVP Central Valley Project • DMC Delta Mendota Canal • SLDMWA San Luis Delta Mendota Water Authority SWP State Water Project ��► i. 3 50.00 45.00 40.00 35.00 30.00 25.00 20.00 _ 15.00 10.00 5.00 0.00 ooac� coal at c QQc> �o o�ej °ec sec >a deb oo Q`e� 06 —Avg Daily Elilue: . - Zone 1 —Zone 1 Future CNWS Future —In -plant —Shell Refinery 9/30/2015 2 Average Dry Weather Flow — 30.4 mgd In-plant— 1.1 mgd Current Zone 1 (S) — 0.5 mgd Zone 1 Future Commitment (S) — 0.1 mgd Concord Naval Weapons Station (S) — 2.5 mgd Shell Refinery (CCWD) — 0.5 mgd Potential Available Recycled Water 25.7 mgd (S) = seasonal Recycled Water (ReW) • Tertiary treatment (likely will need to be denitrified) No brine disposal About 25.7 mgd (average dry weather flow) available for wholesale Indirect Potable (IPR) Full advanced treated water - MF /RO /AOP Environmental buffer - groundwater aquifer or surface reservoir Brine rejection = 20% (5.1 mgd) About 20.6 mgd available for wholesale Direct Potable (DPR) Full advanced treated water - MF /RO /AOP • Some additional redundant treatment • Engineered storage likely required • Brine rejection = 20% (5.1 mgd) • About 20.6 mgd available for sale /distribution ►i 6 9/30/2015 3 9/30/2015 0 v a 0 a IPR to EBMUD DPR Laf Res IPRto DSRSDGW IPR to (100%) EBMUD USL IPR to CCWD Los Vaq IPR 'R to EBMUD Aqueduct 0 04 1 P to CC-WD ESMU. Clayton GW Nitrified IPR to OSRSD GW (405;) • CCWI. RW IPRto EBMUD • DSRSI� San Pablo • CVP Tertiary RD CAWP Raw WW to _ Raw WW �DSRSD m Distance from CCCSD WWTP (miles) ► i. 9 9/30/2015 5 Indirect Potable (IPR) Direct Potable (DIPR) • CCWD Canal EBMUD Mokelumne • EBMUD Mokelumne • Local Golf Courses Aqueduct #1 or #2 Aqueduct #1, 2, or 3 j• Local refineries • EBMUD San Pablo Res. • CCWD Mallard Reservoir • Export to Ag - DMC EBMUD Briones Res. Bollman WTP • Export to DERWA EBMUD Upper San • Export to Delta Leandro Res Diablo Lafayette Reservoir • Los Vaqueros Reservoir Wastewater • CCWD Clayton groundwater recharge • Send San Ramon • DSRSD groundwater Pump Station to recharge DSRSD 11 12 9/30/2015 0 13 Evaluation .- Customer • CCWD Treatment • Nitrified tertiary treatment Infrastructure • Utilizes existing infrastructure Infrastructure • Los Vaqueros Expansion Needed for max yield (160 -240 K AF) Volume • 20 mgd Place of Use • No change in place of use Institutional • CCWD has other water supply options Regulatory • Potential concern over longevity of refinery operations in CA 13 14 9/30/2015 7 Evaluation Customer Notes • DSRSD —total potable demand is 15.6 mgd • CCWD — remainder 4.4 mgd Treatment • Nitrified tertiary treatment Infrastructure • Utilizes existing infrastructure to refineries • May require the Transfer - Bethany pipeline (conceptual) • Los Vaqueros Expansion Needed (160 -240 K AF) Volume • 20 mgd Place of Use • No change in place of use Institutional • CCWD would wheel raw water in exchange • Wheeled through SWP — requires SCVWD, Zone 7, or ACWD Regulatory • Potential concern over longevity of refinery operations in CA 14 9/30/2015 7 15 tq,=-- M-1 V"M Evaluation Customer Notes • CVP contractor — TBD, possibly SLDMWA or member agency Treatment • Nitrified Tertiary treatment Infrastructure • Approximately 40 miles, large diameter pipe (42 -in diam.) • May be able to utilize 6 -mi. abandoned pipeline ROW between CCCSD and Pittsburg Volume • 25.7 mgd — full average annual flow from CCCSD Place of Use • Exports Water to Central Valley Institutional • Warren Act Contract with Reclamation • Right -of -way for construction Regulatory • Will need NPDES permit, CEQA, and NEPA 16 9/30/2015 CCCSD partnered with Delta - Diablo, Iron House SD, and City of Brentwood Evaluation Notes Customer CVP contractor — TBD, possibly SLDMWA or Del Puerto Treatment • Nitrified Tertiary treatment Infrastructure • Approximately 40 miles, large diameter pipe (42 -in diam.) • May be able to utilize 6 -mi. abandoned pipeline ROW between CCCSD and Pittsburg Volume • > 40 mgd — full average annual flow from partner agencies Place of Use • Exports Water to Central Valley Institutional • Warren Act Contract with Reclamation • Right -of -way for construction • Look at abandoned pipeline to DDSD service area Regulatory Will need NPDES permit, CEOA, and NEPA 9/30/2015 4 0 97T-111=064ag� Evaluation Customer • Notes EBMUD Treatment • Indirect Potable Reuse • Brine produced (5.1 mgd) Infrastructure • 3 -mi. pipeline to Mokelumne Aqueduct No. 1 or 2 Volume • Approximately 10 mgd — surface water augmentation of Place of Use • both San Pablo and Upper San Leandro Reservoirs Place of Use • No change in place of use Institutional • EBMUD has other water supply options • EBMUD has their own WW source for reservoir IPR Regulatory • Need discharge permit for surface water reservoirs • Surface water regulations anticipated in 2016 • May require additional dilution water for the brine 9/30/2015 10 Customer Evaluation • Notes EBMUD Treatment • Direct Potable Reuse — Purified Water or Finished Water • Brine created (5.1 mgd) Conveyance • 3 -mi. pipeline to Mokelumne Aqueduct No. 1, 2, or 3 Volume • 20.6 mgd —full avg. annual flow from CCCSD, minus brine Place of Use • No change in place of use Institutional • EBMUD has other water supply options Regulatory • No regulations for DPR, DDW feasibility assessment in 2016 • May require upgrades at filter plants • May require additional dilution water for the brine 9/30/2015 10 Em. TWWOTIW� Evaluation Notes Customer • CCWD Treatment Indirect Potable Reuse • Brine created (5.1 mgd) Infrastructure 31 -mi. pipeline (42 -in dia) to Transfer Station for Los Vaqueros Volume • Los Vaqueros Expansion Needed (160 -240 K AF) Volume • 20.6 mgd —full avg. annual flow from CCCSD, minus brine Place of Use • No change in place of use Institutional • CCWD has other water supply options Regulatory • Need discharge permit for surface water reservoirs • Surface water regulations anticipated in 2016 • May require additional dilution water for the brine 21 1��- M Evaluation Customer Notes • CCWD Treatment • Direct Potable Reuse — Purified Water • Brine created (5.1 mgd) Infrastructure • 3 -mi. pipeline to Mallard Reservoir and Bollman WTP Volume • 20.6 mgd —full avg. annual flow from CCCSD, minus brine Place of Use • No change in place of use Institutional • CCWD has other water supply options Regulatory • No regulations for DPR, DDW feasibility assessment in 2016 • May require additional dilution water for the brine 22 9/30/2015 11 • DSRSD • Regional Reliability Partners • CCWD ■ EBMUD • San Francisco PUC • Alameda Co. WD Santa Clara Valley WD Zone 7 • Marin Municipal WD Bay Area Water Suppliers & Conservation Agencies (BAWSCA) 9/30/2015 12 Evaluation Notes Customer Regional Reliability Partner(s) • DSRSD Treatment Direct Potable Reuse — Finished Water • Brine created (5.1 mgd) Infrastructure • 3 miles to CCWD or EBMUD infrastructure • Additional interties may be required, customer dependent • LV Res. expansion may be required, customer dependent Volume • 20.6 mgd —full avg. annual flow from CCCSD, minus brine Place of Use • No change in place of use Institutional • CCWD or EBMUD as partner /wheeler — already part of Regional Reliability partnership Regulatory • No regulations for DPR, DDW feasibility assessment in 2016 • May require additional dilution water for the brine 9/30/2015 12 Customer • Regional Reliability Partner(s) • DSRSD Treatment • Indirect Potable Reuse • Brine created (5.1 mgd) Infrastructure • 31 -mi. pipeline to Transfer Station for Los Vaqueros • Los Vaqueros Expansion Needed (160 -240 K AF) • Need new interties • WTP upgrades may be required, customer dependent Volume 20.6 mgd — full avg. annual flow from CCCSD, minus brine Place of Use No change in place of use Institutional CCWD or EBMUD as partner /wheeler — already part of Regional Reliability partnership Regulatory Need discharge permit for surface water reservoirs • Surface water regulations anticipated in 2016 • May require additional dilution water for the brine Screen Alt 2b Focus on CCCSD export (2a) Screen Alt 3 EBMUD and CCWD do not need water in all water year -types They will be valuable partner in regional efforts Screen Alt 4b Begin Regional Reliability discussions with a finished water alternative to desal (DPR Alt 4a) 26 9/30/2015 13 Complete ReW Wholesale Opportunities Report Initiate Discussions to Continue Evaluation • CCWD to Refineries - Alt 1A • DSRSD Refinery RW exchange with CCWD - Alt 1B DPR augmentation through EBMUD - Alt 4A Central Valley Contractors - Alt 2a San Luis Delta Mendota Water Authority Reclamation Regional Reliability Partners • DPR as alternative to Desal - Alt 4A • IPR as alternative to Desal - Alt 4B 27 9/30/2015 14