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<br />Water Supply~
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<br />Zone 7 of the Alameda County Flood Control and Water Conservation District (70"1' 7 Wnter
<br />ACen('y) provides wholesale water to the Tri-Valley area and also regulates withdrawal and
<br />recharge of the underlying groundwater basin. Zone 7 currently has three sources of water: State
<br />Water Project water from the South Bay Aqucduct, surface runolT collccted in the Del Valle
<br />Reservoir, and local groundwater. ZUllI,,; 7 i;::. ,.bu ~h}.JiUI ;110 c:IlIJ;tiulldl ",at,,",1 .:'tupply upLiulI;) Lv IIIl,,;d
<br />JUlIg-kllll tJlujl,;\..kJ J~llIallJ will,ill it, ;:)\';1 vi"",l,; dl\,;d.ln mldi.inn to wntpr ,,'ore-Ii in the. Inc:lI
<br />erclllnc-lwatpr hnsin 7one. 7 h::lc;;, :lcqllirf"o nrtrlitionnl ollf-nf_h:l"in crollndwfltf'r "tornce to help "lIrply
<br />its servi~f" area dlInne drollchts
<br />
<br />The Stnt" p"mp' State Water Project>s water j, f'UIIlf'"J from the Sacramento-San Joaquin Delta
<br />via the Califomia Aqueduct, arrd-is-conveyscdi1 to the Valley via the South Bay Aqueduct, treatscd
<br />it at the Patterson Pass and Del Valle Water Treatment Plants in Livermore, and then sendsJit to
<br />Pleasanton via the Zone 7 Cross Valley and Vineyard Pipelines. 70ne 7 ,torI'S wWater from the
<br />South Bay Aqueduct and fmm...local runofT i, dbu ,lul~J in the Del Valle Reservoir_ dllJ u,,,J !'y
<br />Zone 7 lIS'" thi, wnter 10 replenish groundwaler supplies through release into the Arroyo Del Valle
<br />nnrl Arroyo Mocho. GlUulIJwal\" "uB,i,!> uf ,Several sub-basins in the Tri-Valley nTpn "nntnin
<br />grOlmrlwntt'r, the most important of which are located in the west-central area of the Valley where
<br />the major Zone 7 and City wells area located.
<br />
<br />Zone 7 distributes its water supplies to cities and unincorporated areas bascd on individual water
<br />delivery schedules. Acting as_a water wholesaler, it sells waler to Pleasanton., which n, n retnill'r;
<br />iB IUHI, operates and maintains the water f'ulllf'ill!; '"I,lplllnpine distribution nnrl ,tomee 'ystem to
<br />deliver this water to its-homes and businesses d, d ,,;ldib. In a typical year, Zone 7 provides
<br />Pleasanton with approximately 75dill percent of its water. The remainder is pumped through
<br />City-owned wells in accordance with a pumping schedule approved by Zone 7. The groundwater,
<br />wl.i"'l ;, f'umped from fottrCity:...wclIsnnd 7nnl' 7-nwnerl wdl" is disinfected '"ld dJJ\,J lu(.using
<br />"hlornmines - n eomhinntinn of ehlorine nnrl nmmo"in) nnrl pllmpprl into the City's water system
<br />Cen('mlly during the summer months to meet peak-usage periods. Plcnsnntnn nlloridnte, no'dl water
<br />supplied to fkd>dlllulI its..customers nt all limes of the ypn,;, fluuliddkd.
<br />
<br />Plf>:lsnnfon's :mmml eronnrlw:ltf'r e.ntitle.mf'nt is 1 ';00 ac.rp._f('(~t This nmollnt is fiyp.rI hy cnntmr:t
<br />with /on~ 7 which nct~ n~ Ihe reeionnl erollndwnlPr hn~in I11nnaeer fnr Ihp Tri_Vnll~y nren Tht"
<br />f>nlillprnent i~ ~nhjpct In npcoli:ltinn whpn thp rity'~ f'ontmP.1 with 7nnf" 7 i!':. rpnpwpd nlthollrh thp
<br />rity dop.~ not nntic.ipntp thnt filtllrp'-pllmpine: limit!':. will chnncp ~ienificnntly Thll~ n~ the. rity
<br />erow~ it will rdy more on 70flP. 7 for the hlllk ofit~ wntpr !':.lIpply Tnhll" VI_? ~lImm;:)ri7p." P'listine
<br />nnn projPctp.rl :lnmml wntt"r dp'mnnd
<br />
<br />Pka;:)dutuu';:) "-'UIl~lII "-'UllIlad ",ill. Zum; 7 allu",;) tll\; CiIy Iv u;:)~ a IlId";IIIUIII uf 3,500 a"-'II,.;-fl,;d }J\;I
<br />y~dl (dll dV\,;lilliull gullulI;:) }JI,;I day) flUIU gIUlUlJ\-hlt'-'l witll Ill\; 11,;1I1'liIlJ~1 tv LI,.; uLlaim;:J CIUIII
<br />ZUII\, 7. Zone 7 projects that it can supply suflicient water "IWli\" to meet the City's future water
<br />needs, assUlning that thp Stnh~ Dppnrtmp.nt of Wntpr I~p.sollrcp~ SlIpplip.s ;l.,-,,-,\;iv\,;;:) all aV~labl,; uf
<br />approximately ,,,v\,uly-hv\,1.5. percent of its-7nne 7's contractual allocation flUlII III" Sl,ll\'
<br />
<br />(":Imp nr~""~r & Mc.Kp.p. Ine fnr tl}l' rity ofPl~:I";lntnn WaJpr nidrihuJitJn .~y..Jpm A,fndpr Plan llf'''nJ/~ Nnv~mh~r
<br />2lllI4 .
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<br />VI-7
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