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<br />The rity's. C'npitnl Improvement Proernm indl1rlt...~ rrojt'ct~ rle~ient'd to mnintnin the p.xic;:tine
<br />sy"tf"m nnrl improvl-" th~ p("'rfnnnnn("~ of individllnl "lIh_r.ompnn~ntc;: With T(-"spC'd to th~
<br />conc;:trllction of new s.p.wpr-mnin line~ this con"trlldion will he fimded nnn All upJdk uC tin;
<br />CullCd~ulI Sy~klll tvld~kl flall;~ ::'l\"'IIl.:;dukJ CUI 1996:(':on~trllctf"d hy new dr-vplnptnl'nt:-le;: it n("rllrs
<br />AllY ;lIIpad~ tv \;.\.~::'lt;ub auJ Culm\; C<<\"'i1;t;\;~ wllidl Jin~1 I~UIII lll\; la:>l CulI\,;\."l;vlI Sy:>klll tvla:>kl
<br />flail ""ill b~ \;Valudt\;J dllJ im,,,ullJUhlkJ illtu tII\; lIpJdt\,;.
<br />
<br />Treatment Plant
<br />
<br />The Dublin San Ramon Services District (DSRSD) fJrovides wastewater treatment services to the
<br />City ofPleasantol1l1nrtf"r n nmnhpr nfwns.tpw:-ltpr trp:-Itmpnt :-Inn die;:pns:-ll rnntrnrt" hptwpp.n thp. twn
<br />acencies. The DSRSD nistriet owned and operated wastewater treatment plant is located
<br />immediately southeast of the I-680..LStoneridge Drive interchange (scc..Figure VI-I). It provides
<br />both plillW.IY ,.UlJ :>I,.;\..ullddl} l1\..~.dllH.;IIt.primnry- s.t'>ronrhry_ nnd "orne tertinry-trpntpo wn"tewnter
<br />(\vhirh is lItili7Pcl for irric:ntinn plJrpn"e,,)
<br />
<br />At the DSRSD wastewater treatment plant, wastewater first passes through screens which remove
<br />large objects such as rags, sticks, and cans. It then passes through a grit chamber where sand, grit,
<br />and small stones settle prior to removal. The wastewater then moves to sedimentation tanks where
<br />most of the remaining solids settle to the bottom as raw sludge. Treatm.'nt then entails removing
<br />'fhc-sludge i, 1""IVV"d and seninC it aside for further treatment. This fi.r.sLphase of sewage
<br />treatment is tll\; GI;'tt ulcnllC"d the Hprimary treatment" stage. Till,.; 01,.;11\"'1(11 11l,;dtllH;;ut pIU\"'I,.;~;'t ;::'l
<br />,llv"," iIL(Sl::l:-Figure VI-2).
<br />
<br />Secondary treatment takes the eflluent from the sedimentation tanks and transfers it to an aeration
<br />tank where it is mixed with air and bacteria-infested sludge to further break down the organic
<br />matter. After several hours, hnrtC"rin nrtivntps the sludge.,...... L\.,,\..UIII\.,,;'t adivat\;J w;lh Ldd\;lid
<br />arrrIwhieh can be used again,...-in the aeration tank where it is mixed with new sewage and air. Afu:r
<br />~ettlinc :-Ind rhlnrinntinn the tre:ntmenl plnnt rli"chnrep.~ Tthe resulting water ;;'t allv""I,.;J tu ::'ldtk auJ
<br />i, 11,,," dllvlilldkd fJ,iv, tv di,d""!;,, into the Livermore-Amador Valley Water Management
<br />Agency (LA VWMA) pipeline I This pipelin<:-for transports the wastewater to the East Bay
<br />Discharge Authority facility This r"e;lily ,,,,11,,1,, it i, de=chlorinatesd and ~dischargesd...1he
<br />wastewater into the outfall system to San Francisco Bay.2 The treatment plant does SVII'" vf tl.;,
<br />wdkl i::'l 1I0t discharged nil W:ltpr into the L/\. 'V\Vrv1A pipeline, but I(ltln';l :>uIJ a:> gl\;Y wdkl dUJ
<br />uscrlll"=C"~ n portion - nflt"'r it IInrlp.rent"'~ ndclitionnl tprtinry trpntmC'nt - for irrigation in
<br />non.residentiall'IIIJ:>\..ap\;;'t allJ fVI Ju;'tl \..uutlul JUI;1I0 \..ulI::'ll1udiulI ildiv;t;~:>.Innd,,("npe :1rf":l" and
<br />parks.
<br />
<br />The existing DSRSD sewnce treatment facility j, d",i!;lI"d tv dl.wllllllvd..kreeently mmple'ed nn
<br />t"'xpnns.ion rroj~ct tn hrinc tht'" nVf"rnce clry_wp.:1the.r wn~tp.wntpr_fl{)w dp.~ien p:lpnc.ity frnm
<br />11.5 million gallons per day (MeBmgd) of wastewater eapaeity to 17 mcd.' The City of
<br />
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<br />VI-3
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