Ta p ia Ra nc h Wa te r

Sup p ly Assig nme nt

BOARD OF DIRECTORS MEETING

JULY 17, 2018

ITEM 6.1

A

• Ap p lic a tio n/ De p o sit a nd Fund ing Ag re e me nt

•De te rmine p ro je c t d e ma nd

•De te rmine BV-RRB Wa te r Sup p ly is a va ila b le

B

• Ne g o tia te Anne xa tio n Ag re e me nt

• Initia te LAFCO p ro c e ss

• Ap p lic a nt a c q uire s e ntitle me nts/ CEQA

C

• Bo a rd Ap p ro va l o f Anne xa tio n Ag re e me nt a nd c o nd itio ns p re c e d e nt (inc lud ing DWR Ap p ro va l)

• LAFCO a p p ro va l

Ove rvie w o f Anne xa tio n Pro c e ss

Ta p ia Ca nyo n

405 Sing le Fa mily Ho me s

85 Ac Co mmo n La nd sc a p e d Are a

Ta p ia Ra nc h De ve lo p me nt Bo und a ry

Re vise d Anne xa tio n Are a

BV-RRB Wa te r Purc ha se

Se p te mb e r 2002 Fina l EIR b y BV-RRB fo r p ro je c t to c re a te sup p ly b y

re re g ula tio n o f hig h flo w Ke rn Rive r wa te r

Oc to b e r 2006 Fina l EIR b y CLWA fo r Ac q uisitio n

11,000 AF fo r in se rvic e a re a d e ma nd

4,735 AF fo r five a ntic ip a te d a nne xa tio ns (Estima te o f 750 AF fo r Ta p ia

Ca nyo n)

Ma y 2007 Purc ha se Ag re e me nt e xe c ute d

BV-RRB Ba c kg ro und (Co ntinue d )

2008 – Do wnturn in ho using ma rke t

Only Le g a c y e nte re d into De p o sit a nd Fund ing Ag re e me nt

2008 – Wa ng e r De c isio n re d uc e d SWP re lia b ility

Ag e nc y re se rve d a ll BV-RRB wa te r fo r in se rvic e a re a use

2012 – 3000 AF ma d e a va ila b le to Le g a c y a nd Te so ro Anne xa tio ns

2014 – Ta p ia und e r ne w o wne rship a p p ro a c he d Ag e nc y re a nne xa tio n

2016 – 2015 UWMP Ad o p te d

2017 – De p o sit a nd Fund ing Ag re e me nt Exe c ute d fo r Ta p ia Ca nyo n

2018 – Wa te r Re so urc e s a nd Wa te rshe d Co mmitte e re vie we d BVRRB wa te r sup p ly a va ila b ility

Wa te r De ma nd De te rmina tio n

Ap p ro a c h

Sing le -fa mily ho me d e ma nd b a se d o n lo t size a nd d e ma nd fa c to rs fro m

a d ja c e nt ne w c o nstruc tio n

Co mmo n la nd sc a p e a re a s b a se d o n d e ve lo p e rs la nd sc a p e p la ns a nd

c urre nt la nd sc a p ing o rd ina nc e s

Lo ng -te rm e stima te d wa te r d e ma nd o f 489 AF/ Yr

Anne xa tio n De ma nd s Inc lud e d in

2015 SCV UWMP

Anne xing De ve lopme nt

Pote ntia lly Using BV- RRB

Supplie s

2015 UWMP

Estima te

(AFY)

Curre nt

Estima te

(AFY)

Le g a c y 2,500 2,500

Te soro 500 389

Ta pia 575 489

Tota l 3,575 3,378

2015 SCV UWMP – 2050 Wa te r Ba la nc e

Supply Sourc eAve ra g e /

Norma l

Sing le

Dry- Ye a r

4- Ye a r

Droug ht

3- Ye a r

Droug ht

Existing Groundwa te r 31,545 40,215 36,175 35,875

Existing Re c yc le d 450 450 450 450

Existing Importe d 70,707 22,087 45,177 33,167

Ba nk/ Exc ha ng e s 7,950 7,950 7,950

Future Groundwa te r 10,230 20,335 21,875 21,325

Future Re c yc le d 9,604 9,604 9,604 9,604

Future Ba nk/ Exc ha ng e s 22,000 22,000 22,000

Tota l Supply 122,536 122,641 143,231 130,371

De ma nd w/ Ac tive

Conse rva tion

93,900 103,300 103,300 103,300

Surplus 28,636 19,342 39,931 27,071

2015 UWMP - De ma nd a nd Sup p lie s

Wa te r Sup p ly Re lia b ility Ana lysis

Alte rna tive Wa te r Sup p ly Sc e na rio s c a n b e e xp lo re d b y re vie wing

the 2017 Wa te r Sup p ly Re lia b ility Re p o rt Up d a te

Diffe rs fro m UWMP Ana lysis

Emp lo ys a stud y p e rio d o f 2017-2050

De ma nd s inc re a se thro ug ho ut stud y p e rio d

Lo c a l a nd imp o rte d sup p lie s va ry with hyd ro lo g y

Wa te r b a nking / e xc ha ng e p ro g ra ms a re o p e ra te d thro ug h 86

hyd ro lo g ic se q ue nc e s

Pro vid e s p ro b a b ilitie s o f me e ting wa te r d e ma nd s

Wa te r Sup p ly Re lia b ility Pla n

Sc e na rio s Eva lua te d

BASE SCENARIO:

Ba se d on 2015 UWMP de ma nd, supply, a nd

stora g e prog ra m a ssumptions

SCENARIO A SCENARIO B SCENARIO C

Ba se sc e na rio with:

• SWP sup p lie s via CA

Wa te rFix

Ba se sc e na rio with:

• Mo d e ra te sup p ly

re d uc tio ns

• Re d uc e d SWP sup p ly

re lia b ility

• Le ss inc re a se in Sa ug us

p ump ing c a p a c ity a nd

re c yc le d wa te r use

Ba se sc e na rio with:

• La rg e sup p ly re d uc tio ns

• La rg e re d uc tio n in SWP

sup p ly re lia b ility

• Ad d itio na l limits o n

g ro und wa te r sup p lie s

a nd re c yc le d wa te r use

Initia l Re lia b ility o f Sc e na rio s

2050 Ba se Ca se vs. Sc e na rio C

Sourc e Norma l- Ye a r Sing le Dry- Ye a r

Ba se Ca se Sc e na rio C Ba se Ca se Sc e na rio C Diffe re nc e

SWP Ta b le A 60,000 42,800 7,600 7,600

Ro se d a le Ba nk N/ A N/ A 20,000 10,000 10,000

Ne wha ll Se mitro p ic

Ba nk

N/ A N/ A 4,950 No t in

Sc e na rio

4,950

Ne w Ba nk N/ A N/ A 5,000 No t in

Sc e na rio

5,000

Alluvium 31,100 (Ma x)

29,000 (50% Pro b .)

31,100 (Ma x)

27,400 (50%Pro b .)

27,400 20,600 6,800

Sa ug us 10,700 10,700 33,200 10,700 22,500

To ta l 49,250

Sc e na rio C : Mitig a tio n Ac tio ns

Co nc lusio ns:

Sto ra g e p ro g ra ms ra the r tha n a d d itio na l sup p lie s

Ad d itio na l withd ra wa l c a p a c ity fro m sto ra g e p ro g ra ms

Ca n a c hie ve 95% re lia b ility g o a l thro ug h va rio us p ro g ra ms a nd / o r c o mb ina tio ns o f p ro g ra ms

Po te ntia l a c tio ns use d in re lia b ility e va lua tio n:

Existing Rig hts Ro se d a le -Rio Bra vo Ba nking Pro g ra m

Inc re a se d ta ke c a p a c ity to 20 TAFY b y 2035

Ac c e ss to Five Po int Rig hts in Se mitro p ic (Pa rt o f NR Sp e c ific Pla n)

Cre a te Sa ug us Fo rma tio n Wa te r Ba nk

Othe r p ro g ra ms c o uld a c hie ve simila r re lia b ility re sults

Re lia b ility o f Sc e na rio s with Sc e na rio C

Po te ntia l Ac tio ns Eva lua te d

Ta p ia Ca nyo n Pa yme nt fo r Pa st

Ac q uisitio n a nd Ca rrying Co sts

Type of Cost Ta pia Ca nyon Sha re

Ac q uisitio n Co st 706,109

Ca rrying Co st (2007-2018) 3,399,083

Wa te r Sa le s Cre d its 330,075

To ta l 3,775,117

Co nc lusio n

Suffic ie nt BV-RRB wa te r sup p ly is a va ila b le und e r 2015 UWMP

p la nning a ssump tio ns

Und e r le ss o p timistic p la nning a ssump tio ns, the Ag e nc y ha s

suffic ie nt a ve ra g e wa te r sup p lie s a nd d ry-ye a r d e ma nd s c a n b e

me t thro ug h inve stme nts in sto ra g e p ro g ra ms

Re c o mme nd a tio ns

The Wa te r Re so urc e s a nd Wa te rshe d Co mmitte e re c o mme nd s tha t

the Bo a rd o f Dire c to rs a p p ro ve a re so lutio n d e te rmining tha t 489

a c re -fe e t p e r ye a r o f Bue na Vista -Ro se d a le Rio Bra vo Wa te r Sup p ly

is a va ila b le fo r p o ssib le use fo r the p ro p o se d Ta p ia Anne xa tio n.