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HomeMy WebLinkAbout90-13C ENVIRONMENTAL DOCUMENTS GPA (9)W_ d '(rE{�.��.jr'' �[`/yp■ r„'((g �)y��' Vi.@ikY - `yd ,vim/!iFiCVS.'f.BN +i'J :IU4YY �Iw �I1'Y gYf,�'M �Y�a.\� 5i A5 gqMu1.11�� I L :'ti 0— tj. r e�� �1.,:", �r �� wu$Loa , st°d.x fmpacti lKuaar increase noi5erlevels °alongr East;,�Av4nue; the;,: Esplastade, and : PAO Rautes 99 and, 32 'generated by, annexadoni area deveiopnxent Traffic projections wire` not;available,for",Diost,'raa'dvv a�!s in the annexation area, thus precltading a tborough analj►sis of traffic noise impacts: Screening level traffic noise modeling was performed for nearby segmelnts :,,of State laoute 99; StateRoute 3Z, the ;J Espla lade; anii;:East Avenue... s This' ;anise,: modeling Suggests'z th�ita land Nuses e�nN' about X00 feet of the State,�Raute.99'jcenterline,, ormithih;i0out, .lSO feet ;af t ie State route 32 centerline svrrently expeiien(;e a C:NlEL above 6$ dB (tbe ciiy standard for resid' tihl an iuses):t Land la0 feet'; East ruses ,vnthin ,about off, ;t1 a Aest of alae Es linitis t feet{of,,'the,Es lanade c�Aterline� north of East Avenue the P ): P , State Route; 99.=centerLne, or:300 feet, fi of,tiae State Route 32 centerline a erienceea CftEL xp � "Above 64 dB (the„county�stand.ard:fo�.residen6 educational „and health care,l nd; arses). Avail,able.,trafSc ptojecEiozis,suggest}Ihat�,develapmentyof, tbe,annexation rarearwill contribute to noise level, increases of: p .. _ R, ,. —� �C„�,a ':a u . S G 4� : �u s, R.:� 7 g 1r lF vM • � .; � '� ,r „�i °4 abouts 1`6.dBAJalangaEast;Avenueywest of,thei,Esplanae;i ; , about 19 dBW algin” the,Es lanadey north of:East_` venue k, g P _ t• ���� ., we.. about{.1Z dBA along Highwa}ik99 north -of, East Ave u , u e d ,gym 4boufr4 dBA along State Raut6 Z',liortb of EaSt:;Avenue.; fit, „ x' ,a„,� rVvt i l!ncrementally;ftbese, noise level uicreases;woulduiyot be;!ready noticeable„as,most,pebpe tY” .... utiave; diffiici'' „distiriguishxng between Jnaise Levels, that-;cLffer�by less than; dBA. ” t �, °a The noise level increases noted ,abb.Ye, fis5ume ,thatrlthe}portion of ;Easx �veuue west of :the:lEsplanade would'be widened to fcri lanes: but .that no other:acuad, wAde ,`Hing `projects' would occur' in nr near the annexation area. If the 1?splanad were widened to si c or ffiore lames, then trawc,Wise! ;levels'along that roadway would increase by an additional 1'DA This additional noise:level uurement ilisaftrbutable1to,;the:,increaseinb�average traffic: speed ithatwauld' restilt•afroni qv,,, road' ' widening " �yyQQ11 .6Jvi11. `fY4 Al:4^ �Ji O 1 iK� aJ f{.J41 <'+A.lAs7J ',y VJ V' Yr.J�F AI 1��My'l�r�n• " J ±} +d l�'" 'A:. X l�rea>tigatjon C"EQA► Conclusc ..• mess than significant 3VLti"stion M�sp�res g , No mitigation is required. d ' y,7`-8 ,, ;:10 1 '�4 a Yt M „1' r SEMlr1G °OF TRE MASTER PYaA►NS AN"" `10"'N ANnI A MEleTDNIEWS,AREAS _ Aimbltht Aii'Qaality Standards 5.5 R Both the Stateof Caliior7ua and the federal' government have estabhshed ambient ` air duality standards for several different pollutants (Table $4) For some pollutants,'',_ ° P been set for different time pe""rindsi Most,9 bave been; seta` to rotectmublc health. p p For, some pollutants, standards have been based an other v ues ti:y (such as protection of crops, phot' ction of matenals, or avoldanc�r of nuisance ,conditions). , The pollutants of greatest concern in the Chico area are carbon manoxide (CU), ozone`, and particulate matter less than 10 microns in diameterPM CarbonMonoxide Standards'` �, h ,a State and federal CQ standards have been set fovboth 1 haur-and 8 -hour Averaging tunes. The state 1 -hour CO standadd is.20 parts per million (ppm) by volume, why the R s, s federal 1-hoax"�Q'stansiard is 3 pprLL "BOt' State and federal:standards are 9 ppm for,the _. averaging period. Sfate C(� are phrased as values root to be .standards ,exceeded, lrr4lederal, CO standards are phrased as' values not to be exceeded moire than ante per year; CO rs a:public health] concern because xt combines readily with hemoglobxrif and thus r. n..n a w ✓. reduces thea tr►ount of oxygen transported in the liloodstitih Relativel low concentrations "' ' 'n f CO can significantly affect zhe amount,o oxygen,m the blood.$tream because Cd binds, to herriaglob in 200-25� dimes more strongly than ox�igen:, � " Tali the ca Ajovasaulai , sysfem ' and the 4central neirvous iysteru can dbe affected when 2.5-40% ,of the hemoglobin rn the blaodstreamis bound to' Cf� rather Phan to'oxygen. `State and fede:�J. ambient air qua;iity siaridards for' CO have been set at levels intended to keep, CO from. COM "M dvith more ' than. 24% o� the; blood's 'emaglobins(IJ.S. Environmental Protection; Agent 19,79, :Air gt'esaurces" Boi r 19$2}. 1 ' ,California i 1Vlotor; yehicles are, fhb dominant source of CO emiss c in most area. �-Iigh CO l . r bevels develop prunarily during winter when pends of Might' winds or' "calm; .conditions combine y►�ith theoraYation=of ground level temperature inversions (typically ;'from the aL; r ... " evening thraugh early morning pend ' 'hese .conditions result in educed dispersion; of vehicle! emissions, allovinng+ C4J problems to develop and persist during hours (vhen traffic l 14 '`�iF 3 rig '=I 8 1° n ; I; , I Tablo. ir,.ArrAbient Air Quality Standards APPhcabtc in California �' a y k A °r:lb aS as;luicrograms �`� i 'y _ G ",+` c-:+ � ! '..•, ,i= f f1 f'14 �� 1�* ` �'� �` Q�rt'S PICr tnl��lOn•�.+,�,��"-#IGUbIC �IIC�Cr `%14�atl101! �(�terl8 .� ° Vt ,� �A ��Y P'7 ;��j, " fiZ�. �x'� py��n a� ,� a� Ai�..'�4� £43 V*•n r•� � Polluta�dt 5 N -� ymbol { ;' �1Yer T -�Cahfa National Cah�or`ma d California, Im n a �� etAy al a,iataonal d k ILI t �! t> 0.12 V �. E 4 f 1 hoarh tJ;, �,� y v o , .0 SO _ 23 If exceeded. If exceeded on mood g a ! Chant 3 days An 3 years �'3rbUq� mOri07[!dC� �$ hOUd d r c y as V, In s ti 9.0 9 10,0(b ? 10,000 If exceeded if exoeeaed, on more y M fban1 da r eat . v �`,'v: ` 1 sour = �'� �' n� ix `0 .: 35 �� 23,000 Y per y (Lake Tah only) „ �8 hours 3 t NAtr en , ° X1,000, t�-- 3 n r� c _og d,oxtde y :N Nf ti Annual average `' c r y u F O,OS3 ` o' 4 100 if'�Vj ed��xf exceeded '•'. ' x,.... +, r ��-+ �' hog%; �AVI �ti. t� y) 0:25 i.s - , i I �+1 %! �..,i �`UltUr dA07UdCx 14� .SQA" '"u ,An,�Ual aVCrage i. 4�� 0 0� o n a Cykr p " n, ':,:tx- V y 4 excee f exceed ;�,. Id, ,.t .fled = x I ed v `365 L' , `5.� j ,y If exceeded on mord ; F.��h�;.`,f Y� ftp ,, .Y4 _ X:i, �- r -n'.•, 'x`" '�"fJ: n, s , n ugµa b >than 1 . Y Per car SGC <; a1 „ ,a ^_' hoUV f. (L�^ �( L r ,r y. (,.a ry^�' t �' :.y ub i` t1.�i:. ;'�� k k"• .::r:..t: ;`w,'1w l f 55 s•�h , £ �. N Hyd�rogeAx,'aulGde� H „ e'� hou ' ' , a .` i a;, f , , r� -7wa ++3" 1�' P �. r m"1j USVJ j'u S 4L (1F S �i j,, °„f tiu o>x a,;. S 3 _ If�equaled' h"u� t , S 41,W' - Ot exceed - t YN �.:+i; w w ,.�,.,/ , "' 1 r r :'!, .,€k • t i e e7'. .air* T e5, YAny chloride Cl �•4h r u� 31 n �,., 0.10t� abs, i. w ,y x3 ` _ ,� ouis r,9 �'�'�` cn 6"i :' L '� I „ a'.,. If; u�Cd i d t 4y�'e.�,... or, ex►,aedrtiu : .,t.f I �'•.,1 t� 4v� >y b�ipf a+„tr t.tR PBrttclAlate 1D itter t F �w .fi } E PMiI)u °�AUna-" . ., t geometric mea � �� iii : t � r � ? xceeded` �� 10 thicro11S, �1f. 3 . r i ', .. s..w �n r , �;.n s� gar �� { r :r.� If _e a .. w .z Annum ar�thmetzC'meara :'.'` f! �,� If eaeeedrd� ; r r r "24�11oUiS",• {�' � "C � n ` ! `4f eXcaw6d�oII more,, , sy, � , than _1 day.:✓'t k� m .J� 1 �. Su fit If c R, 4r ui� �"' •�,, � �:•x:. tsE � R y y -,,n� or exCc4:dedc :-:�'g y �,,a, ,,. „•, (•."?°} n �� d 1 i� w ��:, k� � xx; 'w� � � 'f:w - �� ,� • ,, nS'.k "�. ,•; ^' �.� road"" �' ` ,,, 6 i .�., P J {;Calendars Uarter �o�.: x.w �, �r�x,� _, >h s", �ro� a ���, d o,�f"�.5 IflgUaled If CIICeCdCd'�9AmdrC c;5,., M),"iP?t 4"'_Y.,. � � �+rW.� t y11lYe �.� 'a"� x, than 1 �a ,h r . �,«"� ,..•. yea : �.� ., i l i k ,yi Sai�; � `� Ii�;.�ri ^. � �' .� ye;Pe' year ,,J 4�v� Gk :-JL n a R � k i r t -rew,p � t 4 fill � �'•J"P SrYd � � ay G t ��, ; r� +x.�1 r•b':. ` =i ;'$� �t4 �"` ar � ,�� -' �� � ° I i 5 � �.�.iC,�7 -7,71777Oxy 'M :.j.�";fi SP 's.:'i sm[.,[Sr' r" 1i• 7.: 1`7 �1 .:l' Itis S!'u�' ..�, ,k• u,,: �.. ,ar NQieS� iw�tMf ,�y h 3 n ile w°k SES �+ dards are based on mcasw�n%nts at 2S',lGaad 1:•Atmospb, pressure.+,tF x LI r National °standards s h0" are the Primary;(hi;alth :effects),; standards: The t;alifornia?-hour standard mor":SO .a hes aril whea state ]-hoUr Q or 24-hoUr'PM10 standardsare;bein viotated'concunentlj+. pP y , y ,���. ;y AF V`,� :!'.Y,�,..�A:��,Ai N. `J�i� 1F£�i'J 4�.,� �W.i,�i r, r •I�y�;,ti n4rcy�'�,p .."i Volumes are de�cUnuag fr mupeak levels,£1 I®tor ve ides alsd ex ibitlAncredsed CO'emiss�on }�••,y' 'VIVA, w ,§.' -1,n & : Y' it;F , d a:�%.� � / � r a.T ^.., U a"�" "Ul , �'s e��", w t!- s i �- a �;iY F F , antes at ,love&fur, temperatures. t ..� p o �� �l ,r+�rit;.i �.gk Ft.. „ 1�, n�.cy�. tri �P' _ 1. 1';,aP,Ca t�utdoor CO levels are a fairly rel ableG� ndicaforof 'poten`. ia1�'indoor'' C(7 levels. ' 13ecauserCC0,is notecliem cally.reactive�and. s fa�rly,linsoluble in water, it is not removed by contact with:matenals o� wilding suri`aees „It eniersdbuildings through open doorways o en a d 9 EV.7,r A t +� �+m ;Or_srs � „n �fr Yhlx++;,�.a r doves and building �enilation systems J 1 Ozone Standards 1 : „• • kmbient aid quality standards have been set for two .of the ;major! components of ;photochemical smog !ozone and nifragen, dioxide n, Ozone 'ls generally regarded as the rimaiy indicator of photochemical smog State andederal standards for ozone have been r.. f t r rn set for. a 1, hour averagin tune 'The state l hour ozpnei ;standard is 0".640m,", no, to'` e Y f , a ., exceeded, ,The federalz 1-hour ozone standard is.;0�12 Ppm" not to be exceeded mor`le�ff a Three. tines~ in any :3 ye'aaz` periao` r . _ x , The products of photochemical smog reactions include respiratory irritants such as ozone,„nitrogen dioxide, Isu�£uric�acid , and¢sulfate; aerasals, ,eye„irritants such as aldehydes incluclin acrolein and formaloeli' de) nitro eri dioxide'`"ani°d or anic nitrates• a wide raa e . • b Y g g. g of toxic or potentially.carcinogenic organic compounds; and visibility-reducing aerosols. �. d , 'tr Af ' 4 <P+t .Zi 7 a,�.4 •I f.., A;n fit° °`4 t r ✓it .�. _/ . ! J `Y A� 4 •1 :inn addition to being a resp+;afory imtant ozone increases°susceptibility to respiratory nfect insr ".Ozone uses �igni cant'daanageto l U, tissues of crops and natural�vdgetat on: .,t.' ,h r_.f r„-cN• r�af' �-Frc ,A•"':f. A 1 .'I ! PP . a , + qPM �' t�'U °:.,r Ozone- also damages many materials by acfini as a c'liemical oxidizing agent. because of its chemi r, activity, indoor ozone levels are usually much (louver than outdoor'levels.' lit d 4f 4j1,4t w n 411, I ti "i'lf 4 i _.1i.,, a ', I z a+ nlrt3r iso Photochemical „smogs ,is a, complex.�mixture of secondary pollutants created` by chemical reaction's# that take Iplace m' eg r` 'd' 1011 ' i°� r w B eznicah .�7 the pres rice of sunk ht• These the reasons aiivalve t iatric wdd , g c garue, compounds, ,ultraviolet light, and e nitro en dioxide, various or narmah components of the ��tmospere.ecau, a photochemical reaction rates `depend on '66, •ifa- �a r P =F.0 kq t 1 }•4 a � [dY s . 4! ttie mteJlsity. of uYtraviolet .fight and:air temperature, photochemical smog Ais pnmanlygg a: - suinYrier air'pollutloll pro bieiri� F i ''F r p FFYd t w r V P d r tit e r e p'y e nn y 1 tS : { a ;t s 1 r h w '4s .'-(,:i ,V dddx Y£} n h- Pairticulate 1Nlatter Standards, te. rid feller standgri`Lds for suspended P icu ate matterwhave been set for.two' a'l$ .,.,i iU r r r °b'!' urll 77.."Q Al, f+& A4l'?'..g 1 It •• a cl�i, �1,, I periods+ «a4-hour a{%erage and an ,annual geometric„mean of the 2� hour values. tTntil t. ya y. F 'Ili �, yt u-! ,,!t :, )J A u , p, ” r ,,,. -d"”" d 7.�Iln.:r'iI a ecentfy,„ the dfederal andt�state' particulate matter standards applied to a ;broad range, of S I t d4 lh,,k Pal" P r'4�n 'd i b7 �a:N'1St µs1° S 1 i Y RYiwt Pr r'_ x P ! , f Stu a D r` . Er YfA particle sloes The sigh volume „ samplers 3used at mast monitoring stations ►ere mast r baL tri dal'4. .a �:g$ X 9'ttS` ? r „ a;a 4 Ty5 r 4„ •JIw r a 07`+. d ! P + r N ^r 'P` • s A . ifectiva }ntcol ectuagjparticles smaXlex than 30 uucrons.�(1 nucron is abou>�I0.00044 r W ti, diameters ,l(ealth,.cancensdaq sociated4 with sus ;ended cIe tvf7 „on, those;: particles ;ii Pt 9 k 'I. t ji p,,,,�i S,,ldW 1_•'�. trm r, a rl Z Nqd �', a i0.1��: u �small enougi ta�reaci the bungs When lmhaled. ,,fie parttcles.larger than l0 uiicrons'in .P$.: cU e c tP t a.. �p•rs 2,, IX,,. S.f"x14£'C,�e�s ,wiM.r4 Ii r ° �: ' diameter reach the lungs•.: Consequently, both the federal and state°air quality standards.aor P `+natter have beeA, revised 'to apply only ti'; PIvl Rg-3 r R N a r it cuUiC meter as 14-,l�tpuur agree r, r ands ares ams ` _ �1 I6C er 10 � mlcrogr Pei a"a. �. u��ar� f� Fi�� �� �� 'PNS 0 The nate„k'�lorst . ,A ,.SST i `atlli�ival ge a -', C rhea J� Tnnt• 0� d, v. �.tif6 a afr1: esti Yq s ,",* fit' 'per ams per cubic; mete an mactogY er cubic dieter24-hour ael�ge and 5 crcgrair�s tandards are 150 crogx P int , can +t y �'�,t'`hn'�C� s cub�c��meter:'as anaannu hin at�,hcmi��� �b@���+' y 1. 1�E r Idhv rn (rod 1.R_!�}„rKF1; rirefie'tr, sC �j�11l► Yiiral aid rbann sodrees cu al �s r.�� ��At�D alley �� �, b �G �� eiicietfalC! '. P the Sacrr�p�p .:. •�v :. �,�.��"ustirtal ° f `scions; iit sw� ended v , .� 4me i s. t4i" if P,u Idhg of a icultural fields! u?reui {5 ,.� T�... is . ,. c lsIdhg" gi mica] smog reac sans. _F _ burning„ aerosaLs formed Uy photocbe ' and secondary ]Existing Au` Quality Con . ed' in Table $ 2 The co area `afr summanz iEi'tie� qutY�morutonng data for thef5a 1 5� ° ' G , ¢ ically exceeded a few tunes`eacli�inter -- ur costandards are typ �, , ,ar:. c i 'na1'violations of the State'' feciexal ” d stage 8 ho . e eriences occasao pwnto�Nn Chico area; All of i3ute County ..? st"andard is e�tceeded, about ,r 2% 5ta adardI durum summer. The'state ?�=hour pMlo t , , x e ears. The state annual PMIo standaxd is' also exceeded 7n mast y ;5 of the time in Chico , gMona emeelt Ciro"s!der`a}ions �Yr Qlj alityig ?rslSp 9x -'p i�Y,t p(•b F k u Is ' q r & a t 4r . w.of lanning and maria ement activ�tie5 occur in context. a.P, ,Y:, islatlon 'the feeral:Clean Au Act agen,�Yt,,. . r.:.- for'>`�ost ty �r uall tr f�c e'ral'an�'siate le establshadby aYr , .,Siative"authority k regulatorya prod ams f9$8 rgvide a major lege r a , `°Cahfc�ima Clean Au Act, w :. `� air quslity ,mana�e�me ,. ,P,rograrr�sh. �,' .,.•; ���.: .,,,, , :,a� � . can Air A�� mandated the establishment of national ambient air • f,7 , ,w <td t. era] Cl _ a re are an unplem�nt The 1970 fedi o- ,:f,. :`areas`k at°violat61hese standards top POP . , , f ds and ulred ���;. rr ..� , eas doilot;Ineet federal prisriarY req � �, � deadlmds • Ar that . F 7standar�� e.standaxds by ce „a�w E� , ofe1990 federal'C1eaZi� 1ariSFto achieve tb h ass' "noriattaiment areas, fi uYremants Ball s dazd 'are deSignated k � a euugsioin'control prograrr► req y a �... '` ' ent'deadlines an duintssetne�uattauun ,� �. , ��J�.,Y�, �';, ..� ,[ r C ozne,'C4, and"pNilo`standarda• w Y,i°' °r p � '..� L'u►�rae.�� 4 'i'PE• I for are:` that violate tyle "fader: sant area under lite 1990 federal Clean. nsidered� a CO nonattauun standards is the end of77 e "federal CO •m, yr Butt; County adlini�'for achieving tb . Amendments. The de - Air Act„ 1995 -mf t : b �, � .a#laaaeprocess t 7+airquallty D , FNu , , r of 19$8 esiabhshecar r Cl` an"�� Tle Calfornia� r , F , 2v x {.;4 } �� The California Ac pct rocess , standards hick • { arallels` the d . . genal. federal 4� 4 en Clean�„ P , , ft i �sthat generally p Y, ger " dent au ua'aty ,, �xG <+ krrc_ s orifi attaint ottfi 'sitar�e ifornia Cean'Ai?.Act ,. ,, t ; ocuse ., .,. `"airAb e rase . Iov�ever le 'fed ratianda o stateP Ment Act, � � e ect't a o s gnt,thair. ,;aw.v� y_- eft areas;with Aresp , G :, are �ar a ',' e:i_tt 5 ,1 • �atiat : tl r,e w kr Rf p' b d :�, d altalnment and pori rime �. , 7 s most eve .Paan F A.F. a at10n of „ . , �t ,. x z �7 y , s stanCiard , a uah . e vure design at�lofate�atn statelriQ ti able" ' Mast uv aur c: a ct#itlo�tsl�us prat e air q ty seat a'4 p.r.amh 1Lu is "dardsii"a.is eicg aCllieve file :', lin �� � a ..r i a f � ti�r�s.�.'{ k� �j• r* a 4R � "4�v �y ur L.J n , M Y s far e Chid k,`rea Y Dt Table 8-2• �7�im5r b(�� Air DV l It Monl'_to; ing Ij 1' iti,tt n f n ^17 o _ { X zOe na '7 .3 ,[ k} a p3 ;'� 19©5r 'x l9B5 ` 19861 3.88 1989 'P 11on1 r ng •Statiatr parameter .�•, 985 s f986 19@� M i 1988 r. t_•P tie "i�l."w T't ,b. „" y walUe (PON �'. ��� �� 9.0 7.0 .':v 8 010E0; 0.10 Or=i;l sO,ld r ,a4 0 _J19,10 ?,.. ►tanzanita Avpnye Beak,'1;-hour p _ 4 , � ; p a Reak`,a^hou►`�V51uU l P �t$ 4.9-� 3 '/ 4.0'; A �, r' NAS �tiHh ;, ._ ' 418 N K , NA MA 0, MO = 0, 0 if Days above Ae eral s do and i, Q a pays mbove sthte standard 0 r 0 0 0•',, J o p?+ 7•. ^ r>a.�"•' t d" a f } r a t} `y"ur �" v� ,.A S ., r }•: , "')5 '< 1$0 °� 20.0 17.0=:� Salba Street Peak',a haur'_value tppn), . 0 Peak, 9_-Hourvatue t)9�S ri, 10.4 S U ppm, -,i,,, } ' 2;, v ya s _ r, f 2r.` 2 G ro+-✓ f�§ p,�,': " t Du s above {aderal'standard ys'. mate,, 5taridafd DaC 2trrr d it titan t d k ,: 1. i• } ! above " �2' ..,+ r rn:,1...- , , -.,m r ' { ,, a',ri < r i 'J, ' � " x� ° � + ° I `�. t� i p LH•d * ,; �. ^ • w e &:'t " x: ��'� _051 ' d r. .4late7 rTutal 5u�pended Part e�Mattutr �jSP)�� ,,t, I halabl 9PPrttculat M, K ,• } - -� t { h ,• ° ; r + „ t 146$ 1956 r , ,s,19S7 : i X1'183 * 196$ �" 19552 t r t96 r rK+ , 9�8 ; 1959 , 4+' "OIL taticn Parameter e, «d _",, , �� �. _ n w"a tt, �r+M �.»� •1=.� ,-;.e--. .aw,s �'n, ,r.,".! ......� 4... .. '9 Y aeJ r its- I * �t �rh� rj.. L n, yiL.t.La'•.� . •'''. 'Gv � n! .'4'%� S - X42 11 ".. .'1rY 190":, S ", ;: 'd F�,,y 7i -yam:+• r",b.l+ MN.: - ' tr a .rT: j l , w a,•. 4 r 2 p 190 Manzanita' Venue' Peak;:24^hoU►_.„Yalua�tu�/�"3) �� ifw� v 160 ` ;N,�a <i.; Yi;} :...tri " an^.:tu /ri:3):} , . .'n;ns<6?°4 ,,I,.-, $3.1 .'��.� i:" ' ,' °'�' ,.0,;'�n, -�yN G.;'- t _ r Annum geosetl me 'M �a�r :: _^ t .r S+:' I,V *,,:. i-` tl d74FU "#0 5, r "i ' :6..+ 6. .•: rJ Li c WS 1 .,M :1„!, LA• r18, Ty t Annyal arithm4tfc Bean fuglm 3) s` r �}• , r �'° �� ® 'r�' .:.fy wb a J L:',, r 6 a, .. o f''sa lesrahoye„federal stagdatd t< 0�0% 0', OX 0«07, ,$ t . "_ E .n . i, ,i .. ..:.. ..r �& , rr ,,a a ;s ate'standard f %:3l.:X_ :5.7% '.:, �13•Sx '`„* Di`{ 6M.. 2-,rS!'t d sd (� , x.v ,�, .:us.-! r i+.I: a.N , �, .. •.,,;. 'u •;+ ., % o,„zamples b�v fi h d' J h•'f �:�, J �, K.x r., P� y Y { a.., ". ) k° } �„ " a t�y� x '0 5a�tm Street Pea %4 hour rvalue .lug/m"3 w y FjS w.+4 ^� j «.y e: G_ ' ' C, C x d,$3.2 #' d A _ k� M Armval eosieENc; meanr'W /m ;3).:, n g g • :� +* r a %.'a wz r x ' �an� .3 /utnUal artthAetic mean«tug/m . �, ,', 4 `,' ".,tio• %:". , W. ,r,r -_.. :�:..c;• ,•-` ,. .. ...�•7 v.l v "i rl! !-,..•4;, ^t'x n:,y ' 4.9' I r[.. �•"t ' j`. " S .,.:. �, ,�. W"- G. GX:: d rill,anp abtle federal s.,a{q ;r.. ,:;. - �.. v� "r ` ir• 1 c; ,*�%2 7X +�NTaf,va.� a, ,..,9.':�„p,.aa•.... � X;0�bdmple4:aboXe-daep a bl 1yS i nsh� rte? r ,nw i._ _ j1 �+ a7`•; L4 # a M> � it`, rte eakn;24 Our`vaI.W,(ug/�; 3) ,° d a („" Lr:< w a cugh, ti_ �Y stie;ifnivera � � 94113. _a'., `�I ..,, , .. _mt „.r, 9' 4 a r ;', 33.9 t'29:3, 32»4032 t..: u!1 eomel ri u�mean.: ug/66 3?. ��, 52i� . « a 45:0 4t)+ « s Ann " g -:.,.;.:4" .. ! <. ,, , 3' Ida a' " P 7 Sit k s § 9?"' i3.' 'a :.K'? 4r31.6 6 7" ,« k,A.r . �,r' ND „eMp.,4, „_ «:, .,a', 7 9r 33,dr 37 ,�, artthpetic. mean ug/m, . P :j,,?, i ND,. zJ r : tx t� . t. Pn im . x a , ; V, "� :;;t �, .� ' �O.OIr"g ''--'0:0%''0%�� ��''!0.0% �:.O.OX; . fade at :, daPtl-.:, 0. x:iJ ns =; ila� ,,:, baa,In X�; f,l+a les. above.. l FAn, 0 41f �► GX , o.. L , rQ;-.,. �. r e:•„t r, h a •:}:t' 13.97 r`'13.Qy i«: r� s ::. , ., artl;,a wr ',G�OX,,+ 0.0%:.' 5.7%ta "„ k,. .rr :23 1% r a'mM ac2pl,e5.above mate f'W r,i '+^'%t` J�'-a� -. +'.r+�; •+ :. '+ : *'`i`" 1.-r+ r .y. .a: ..:.,r ;aa�p,11 d=;a 'T• _ ,','',.,,•, tr.. t 4+,._tl'' ..s.• ).._ h� 4 ,�:'ae„ 4_ ` ;,xS 4,',�.. ...t'�r.w ,', •; J ,�g :fir �y'f :,.'� 1 ,,..J�1 a`w•,..$"s,K...,' b'1x.�;� v '. .'�.. e i �4 r 1�_ -�y� y yx ,: .,1, i•., °-:::: 7;.,+ ,I,�'}y, a. n .;:flra^a' >+;h r..". �kJ ; tar3 7`.}'..,irr til. rtes). .4 �t r ,+,: Lih'' t :Data ;,V101umes,:%Vll XXI:��1nti.+.q}, rJllpla G ,. ^ ..,� R,'.,. ':,*' 4 v'•: Sourcesaltornia ;Air t, Y ... ► . +,.. , .._ r . r#. kd:: �, , „1: , .r ,•'.rr n...m..':•1 d..r',?. r: p•yin,. psi' ,i,, '�,u-.,r,.. ;�r:a, ._�:;'� WO 0 nnit�abllr. 3 � ::r .• ;r::m � �u Ky f?i .:x � t n �� B f!}!tESi �,..,. n t �',.�... ...:...;\ O'Ya1 !:i m'+'e} ; �,n ;,`i,' usa . o. f ^"i^I ry,;," wCa 4:... "fr,i w 1 "`fin .. 4 .. r i'a.Y :. m+. :,.: _..::- Y" tA. "..„. +� :.:.:,.r t;,r.'".ti,;,a r x'uf ✓tiya ,w,« . '4..:+C•'n"'" b."H t S t 4 N_.'f t"' 7 i tµ'.� MN:N ! 'Al v.: �• 7'1Y.p' + ,IVD' .:i:t'�s ,} $t •w rata d:Wr -..y. ,i6 '.. „ri. •�1.P lsr 'k m:... ts'VO4,4 . a... , :',q (.u7 `„''xT 1"rc+ i`;"'.: '.1 ,'_:."V` `.-s°s'r y Y•... e a rt5.:' : � r Pp-,.. par . py r, k_ �m;l.., �r5 "p`"",:s x #f W. s• 'xT) :: „r,.,..rdl :on .e,�: ).f" _'� to►:'Ys.'.. .dn..: ' If. �� Ug/�a 3 m .:�.q+ �: ..�. ,. "4 ,.:...4,. „ .J.' t.. ,,.. tr,y .w- ,� .i i f � ,tn ",. is o t < +,r" mdrioxftle.ztandard is 20. pa rGM`. t'ederal 1-s;:: „ 1r;'W, , itehdgd i5 3?hi•i rotate' ` 011r cafban ,a Wim,.«.x. p.,: a�' 4. �J Fatler,<7+� a ntti"m� '1,ldartl'!s 9 ppm( state our carbon adl�axlde gtanda�d.lg 9.0 ppn�, 0.'✓2' pmt state 1 hour:ozone e:: taneard 15 0:09 p *�, i s as - 7s ug'/& annual' gebaatric' aean� 260 Uplm"3r q h'our.l ave►age. 1 ril;dr< aG ug{AI 3p'annuii geaeetrtc'mean 100 0 24 hour oaerage. i•' S0 Ug mA3 .annual ar' thaA Cr leant 150 ug/a `3i ;24-hour verapa.. ,tW,aar�tlt10 �{G'1 g r Cr< r,8it ?1t 30 Ug%a''3, annual geometric Wean{ $0 ug/it"3� 2d -hour .everute. a r , i r l es- �.+•. r$ :E'M,i«i P�' 6,re r ylb y 'v R'e ��. "2 , : fible 8-9, 9uieary o{ O:ona.P►ecarsar Erls"+foas Anutyits for. Davrlopeeh tii lt�e 5�h'pr I;1i►11u@hcea 4 7 PN fa k4Gln 4nc� ?Yr w e Gs;;y.M e 1 a.:ay4 iA3� Fr,'R `.b :.+ fdJ t Y, ✓y , .i.h .y,, Al; i ,q a. .....L RA P . r 49 ? ,✓ *d - 161 . Nal uletdap':YlAlcl@ a r ayz'' i.0 .�. - r + Z. li-- ..«..r km ;Et � .. �, Gur�o�ROC'Erlsaiopy �� SurrirROs Eolnton, �t:9VaAerkRlekday ROC ,, Buree► 1leektlr. f 'o' ;? w Trips Gliitr� ed Estira!ld+:Allly V0 Ral4r {ries/s!itt p , ,� q 1k rfiateyfgriishtlgl, Eel'ssion ; ipoulds/Oajiy Erisslone• 1 .at{ dsJOi Urban Aire Develbprent�Ssurpkloni .�"t } - Exist 9ul0ou! :Eristin , S " w'a `• -_.,.; «.. „ ;, q . ' q;; 0 11dou ' Eslslln t, �u1lEout x E'isff�i'',Zt " �, _ --- Land:,Use E414lnq CoAdltlonr; ;buildont:$ondl.tians Contlltlons<Cond1 o qq �.q"� - 4 ,;,9- Bul dbutr J Es oltq Builday,; Esi411n -,"101lOout k� ns Condit{oAs.;Condltiogs; ,Condi114ns rCidltfon4 `!Co. Iti s°: c4` 0 ................... .. .� t on Condi Codd ConO Cond111on4 C�d!lions on ana _ V1, i" VLL ti0 4 tl- ri... ✓ � es r4 9 n s 1!i AeriOentlol Der:1opcnt t , �,'.t } � ��t. f.�� vO iii rul Re4iden ial 742 .,Unfl rz 6,1'770 ,^'units �q f92:i;~� i6 09 2S =a ► �� .:,�e �•:',� ,_ ((,,} E r r„d .' << :. ► r 7 f341� y 162�IS4 0'.o0I,, . 5- h Lou Oen4lty RtsfOtstl,ll; 12 101-. Units d + �21,U23J Un1ls 165°223 1-"'13$•310 391 201,,;^ 1 , e::;J � , �r 206 2 ' 71,0, 244,0 I}ldlnr 0pnslly, Resldenll'al 6 400.' ,Uniks �" 2 89 ” ° , . ,G{o 8.ti°901 ; ,tfib ,... , 0 90 ir2l� 1168Y,, i't'`'f30, 11G3. °� „r . 0 Unto 14,131 ...,:, 140°274 115 876^;int 29 752 r ' °' ,st „,, r: t Ka, i .. b 1,145;0 1,264,6 °,� °.,.._ 166 4.00r.,.,1.�27,�,, ,a :11:68:' r,et'S32: 51 .I:> 100,9 ;;g 430.2 ° �z NigblDeneity ResiQen4lal 11966 `aUnlll 2490$ x_Urtfls. ;750��� p1,239 2)O i54:'"j 5 Ij12 Ot04`�;' -1 , -•--- -- =-w... »_ _+ �-, �i �.._•%. r 6�6Gd� . a 758.1 5; :G20 2 1 6 ra--9G1 -��97 a „` Snblot�l 31115 � wits�; Units 138°301 ,� 101, 71----- °.'2�343,1.,27750 -14 �4h t Q52� w v. 't �' i.�e J r12 + e aA L x.•,. �.�� t i Nonresldenlial Oerelafrank j� +,ue lkighbOrh00d ;COner►ilai . Glx Ii ks, r ti.�,, �;'nw s ':i . w d y e e +.�%1 r a �. 113a,,Acres 20,0!7 ' 33;232 120ri33 211-91','- IS9. ��,.0.25r t, y`; ,� ;a ;•` ; wCeRkr•�1 holols4 Otslritt 90t, , r„n� �., ..k:n,, �a a ._ �, t.344 , , 0,:71 A210. 1� 3�8°4 356.a � 311 1. x Atrrs, y 90f: Arra 11,115 r '21,557 1S5,6G9 _ 1'1S 14G 1 6 - • w, d 7 3,a d,, a� a, a , � .,�� r-' Gdneril Cuaaisiat 7SI 7�Aerpa:.. r } 1 309 . tAe es ,,.. , ► ,, .; • Q , � .,. 51st wk� ;Oi13-'e 3 9.7 ��241.1 156.1' �.. 23 �. ►. H; ► 134,102 X305,173 819°131 -.1233, 17� 1".'57 Av ;���,, 0;`3 <.''; ii' .,� y ;� 4.5 in0@strlal 65),.t 11cre> �� `,. t X3,;1 �.� 0.75 ; 2,did ,2 02¢°1 2 132.4. 1 542 •, Acres 23x460 `:'�10°290 169,113,,: 1 O 591 ; � f�SG ��' �"'�. � t hs, R r r...,. Airpo►k industrial f.i6 Acne " i !.66�Asres ,�? ?' ” ° ;, t,aY�r r'70kt' I'63�'':�.B9;8 6696. 65270 i� aea 1,152, _x.6,931 i1°94f1> 92'41 f 5A 7 ,,499;0, .e :a.�r -y- .�� .� .•-•- �� ,NY"T".--� �<I wkN° rt x pt. G• 1t�6 . y * 1 eN �f21.f a,- ° "' L. Al. I� y ti JI 1i1 `....�1 1 AS;O 107 9 &nbtotil Ii6]BAcres 3 20; Acjes 26S°936 ?310,191 ;1 291973 '1 3t 31_ MP rr' ',u `?>, .;,:� t °�: i; rt3' 1x�° `'ri , �� ; + ,4 9.9 &20 3'962 �t '>"; 3 411.2 f01a1, V a�- 6. 4 1 . 615,901 2i 30 9!I'w,, T99 01'J «,,; IAMC ! l� . t� w; �+ , ter 1js 2.2' 6f 156.18 6 305.2 't d 6 186:2 lr n ; "a r r ha�,..Jx�r< -nni 1�r1r� '1" e iWO: ROC- v fouttr �� -, a organic c ds. � � � �..0 ��t �� � ��, � � �-, In =; ... �- , ,... � 1: 4e r �' tb ', sl � 1 4t �"� tI' r'dw I il. 'tr •Y" - s. M mu , } Moa = nitr6jw ol1Ee4.� � fi a "' „� ? � t 9 �„�i 7 � t �V. - t �� k. 3 fi p �. yy � .. .u��.h. .� as ..,•� 1fiP{ t i r n,.v 3. !', -: }-r>=>�,•'!� Gee p nn1 114:4@IMSriz d id tb14” E, t. 'f,x„ 's I.° e. a y rn N t a ,P r• e w , r t iltr i far; delnits of tT�s i x �, it z T�e7 k „ Jnr :a: Y table. I � °, s' Gam?' �� �',� �a ri uh � r;,': s4 q � I i2 `t` 4 r' ,l tr y� ,A• . ,�_., . d`,. to _ ; 4iJ J ;wis •, r� +"f� �:, .., t .�: c.'I tnJ rtal� I nur �:k�,. M: � � v�� L�'°' �.: �,',� �q �;,ro Y;ot - �M �: "•' .. ::i^l� 1, $$'° e ' .n':e. +>zx ^ s, h �,�, a 'p�H fiei - 4 .�:,� tib. >n R.. s•r ,..,... '.:',.FSggt ;-.��.e,t�ti . _•.ot,nd;.a+>7 6x�"'? `J� I °rw_C.¢jb , 4w:sxp.. 1 ry�e .}wl-S .. 1 Ix j 1, .it r,: 0 W,:q I rrry 0111 n n"ra�rk'r x .«• �„«. urcCr r7 f 1 1h qQ :1 J •: ��a,1 zroe `�'i mss � � � �'y '� (^ "�� `t:.n ¢o axil ��,� ,tt•+r,'s rw. fir. y . 7, r'�w 1 .'� a?�". r �[ E:4A r ,1 y� r vV ZI 1r'' ��'ie,C'J AMy[v,"�' � v x✓A� 'nd �:x 'N`w xi pI 1 � 1 1 I 1 J 1 I i f: r I , W N 1 Jaz i vr,�cap ra i « _ �. at s�O1, ri�� ChApto 9 Poptilatxon 'and on SETd'Iil�`G OF THE MAS PLAN'S AREA j �), Populatlo -+t 4 n{� crYj, i 9 a 9 4 a. S7ut1 4:Oillaty ri •1 ,�'� The population of Butte County was 1$2,100 in 1990 Tbie unincorporated areas`: :,accounted ;for SS,%,af tbat�t� al ar ,10010Q Californiab ercentag 'g h par#ment of Fanance,9�0). Thin e as adent�calu�to�the�� ,U ���r P 1980,,14, el of u�auncc�rporated� populntaon, s(Butte un ty Plannuzg< ��ipLil i LL t✓, q� W u a G u a r a 3. J 4z la@ bs fi¢ 1 ent 1984V) r r Y; f � • —` �41 Y� {,�w "d: °1 :uv w���a�r)�T� �N �Pa x �., ra65,$,�^{akw! r. I Pi, �"�'�'# GrP , iiQ unincorporated jBut# Co �ylaas dslowe over, i"° ' � �` t,, v,,_ : t3, F ad a •,'M;►e past decade. B teen s 7„ and the s �, ��a + ';µ d , 19 0 �=1980, uiuncorporated;�,area�of theacoum gr d5% etweeni 'sand R ;s� e.,,, ,h' ewby o. 980, ., i990 however, Lythe area s, o ulat�on 4ncreas d x b ' ` ' ° ; P , ry �yyf�Yi , pop �. , , �e, ,"�y �a"nIy//21% (Butte;County Planning Department ., ti . g5A 4.6 h_.�� �� I a • .. 91b �l kti1n'.79 � � ird r}'Mi U I�"x} �¢�r�,1 � l�.r� � '"&";t� 41� r�r qqF :�h 4` J!�^4 n�?�� ��� S ¢ is r ,:. Y t �t;•V �S r:F u , F`' Chico City Limits and Sphere of Influence ; +� vl�'"1''� a`""��,,�.a�Az `4i Y H x Y ,, Ther;; o ulatian of fhe, Chiccy +`SOI !, l » �{•/i°,,.'�% P, the.' , /6x d' a w :., �pP b7i ,,; F ! u, a ! �9 s %+ 4 i� f a f Y P a� a xoxihnatel 58 319 an 1:980 an' 6 500 m 1 90 Thea o ulation in SOI ew at� .� hP P -� " ga • can a+�era e�sete of Z o peri year, over this 1�}-year enol , , �� g °% ra, P (�}t+� ofR Clucoonimunrty Seavaces� department 1990' $ears pers coaun) �', x F ,roti 4A F •Y f c M I xa aNJ o-. I! " 4 „ R M ,y,'+ �,t l r�'� f,i c f7 xt, + al I� 17: a YC d 5 ". a A s'. i �h :. ��w ue 4.,71 UR� "�.� i,��t:�, +1�'Fjm1?& r r,F�o aiS t:d a k r', 'I•he ;ca s o ulat1on V ,I 1 .MIP P �ncr�ased Eby'5,�abetween '19$0 sand X1990` fro"n 26 63,to. , f 1 1A, - F, t! r xt-.,tt+ daxh e P,\l c. Y A.•e`a �...� 1r .5p" tit„, I 3 *PR"0 ,,the�198019909[•�}•}owthcrate �"}}L the Y in/��jp II����/� /� /� �7 J/(� }•.J�/y� I •. '.� ..bG�.V n,W-.A V jh.�, �A. d� W71/ � e Ct� tlr if the,, 197�A 4,VOtperlo V'� 1 �3 oirl Coif 13'x` 111 • n a E: M ".during whichd�the city grew�by, (C�tY of� C uw y Sernlces De antanent 1990 Califorma D irttnent "� ``" P W'n ��large percentage of`the"SOI` o I Aq ,,;jatioaYjs ,students�4attentlin 'Califoriva State T^' • ar..,ps a�A ,4�ruv.�i+� td �� y �'►t " iUC Accord u g to tl �� bpusmg elaMO.,, nt' of the hicc genetal lan, °in 1984 1 x } �<,P, p 6 ,7d,n,.z,.Er#8,vF.,1 , ,.5 x , ..1.. �.,. a zs x 0 itve�an the SOI: ;Therefore' w ,, 4,1981 students �(aa�veare attendw 'csud ani 1?,L�" •1 c'"... --ra. %tbf thV,1 droit d_^U� O�d AAi.r� 7� z; e� 1� 4 , +;the studemts accounte Yfor 19 people liyin in the SOI m 194 d ,F rR.ty-# L µ h yI R k r' .r n ww y 5maw ^ i gu r�;. (tyof Chaco Coimmunity� Se yes FDev�/�artmeat P -.. fid' qy i i a'R`� � N J'�at d'a �+1ka �.A"i AR F'6' i dS'µ "I @ da , � y! ry i,u b �h :per Because"they are k large proportion o ,tharSo Dopulatian; the CSUCfstudents Have c 1w NIC lar i.:kud0 Ak 1�i4 ,[1S,ijaT R.+ '<1'� ....I.+V!'�.. �:M1,�' a considerable effect on the median _age of the :SOI popuataon, According to ";the Chico t 10000,,-Aanhausingyelement,� the media age�ofR;tbe S4I ' 1980 was 23 9 ear a A' bi x r1 us , t qr ,vxp *n 1t ksx °a q xi, u 4w,e k, t �• ry s ��i1so . the i ;a a ears accounted fo 3i e a ' yl ggrdup r,;� w%otapopultion any'tlie 5(aI ` In 1984,hhe.' ' a I i v, , 161 j -, 777"� r i }1 I -,': {,I �c^AG�i,di �,'rETZ'fNG x4F!E N� +t . kE dry n1Jiµ ,o1�8:!{ryi'6ww�� yq`_ q ppm p y �pa.r h x�1r��v1'�j contains r eia ed Tlie��area digst� �e;, land.he°'aanexatytin�aCea ys deV p . "' '{�X be ruralesentiaaa and 93% approxunately 6?. dweWng ts, a which 7%a are",estunatetl{to, r p is law-density residential ("d'able 2 7)' . Th", existing go ulataon in the annexation area r 06 ate ka f�1;�785're'ssdentr►, sbased 1 dn.Yoccupancy� raze of�3'PPpeopte,per�dweUu g unit and es"t r - z•t Ca 4{ aIN V n ka Ay�tia r r 7 �r �� exi$tyngunits' (',Tabled-6). ;a�5%`�e�acan.y'rate�for�6 i Q�!,q + ! <a, � s i} vita GS6i 1\alb VF'TIM ix+�:rllil�i+ ,i v ,; r,„'� ,.( •., r .0 I, F ,:.6 7 ., The unmcn Channel thatzwould beaaffeeted by�.the • iOrated areas,northrof the Lindh , ”" arne'ndments are` presently es. gCixeral' plan. ,r t�. z I 1 r c• ;�� 1� �„ � _k l;i 9���� 1 �d,��Y � .F �k`wfF "I I�,: 6 ' 3 � /R 7�Q �'/(1Q OF M, MAWTER PLANS I1:�P��+i S t IRIA r 4?}'C �S Abp V [ fkH Y �.-. �p� i ' �,�; iF DY fi(yb ri' , , ;r � f� ay r ,� « t'q Slit l �{ 1 � '�� tT, 3d ±., _ ". ��d�'b'♦T <� � YP 4. 0 � j�� 'i1 1 �a,��i d I, �; /17 {.1 if �C-.� u7�9...,opnation� lv �`..S rrl S.W`✓CSJ. ,Y .t ., Xmpact: Increase in Chico sphere of intlyences"populatyan3r` Acro tion; of the draft' sewer; kand ;dram a nester lens would ,result in, an increase P P ,. _ ` n of the Muco SOI ' The master laps; accommodate a btuldout o elation yn the �tao : g P P .P , `4 r. pogul „ Ctiica.SOI of�approuinaately 200'OOO;ta 16i%increase,yayerathecurrent population the { ` syn the 200 Ol}0 o elation 76,500::The{a�ssumptiginsidoYcumented in the masterlpan•s,'onwMch; p� P (y T, •m'.Table^9 1� �` +� +� ���, '���'✓,'r"'Arta"'w"�' I, ',.0 !,w �tl. l��'_ _ 'lj�',� is based, sire shown r , • taco SOIk could.supgort, a;:populatian of 175,400 at Based dn;hystoric,deiysyyesthe r v in overxthe current+ u" Maty®n,} ,'I'hs;estisnatet�sbased , euassupre ny. t'1 owngn �yetozils sg . un P o-'r4 J'' c qs ns4'�m )�� 4 ��Ia�;t �YyY{- yi I �� dtIJ�1 b 7 a .+, t x r... .>7S �! . �Y J.. t U�Iti! '. �6� _ " �k a � qq ..+ y secandaryimpacts�becanse,�acrdtng CEQA, Conclusion. Sigcuftcant -' reMitigatdoyt ' cn lix {°nth State CEQ1�►„Guideryes, 3a,p oleo iwillInoM yA have {a s�gan ft�ant App .;A��to , „ . } �• � ”' ��indut e;-s"bstafi`64, � owt i or concentratyonRof popnlatlon envuon�ogent,ifit wdl77 - �ffec� on�.the in the � dther;'impact chapters with "sign ff0pit"; pr mitigatyon,.��CEQA Rsfer, to :unpacts conclusions, Wx rI 1 1 „ Wry .MIP u 1 t( iry �1 �' f qiN s1" PI n Mf'r!t `.y�"1Mifigatiah�NJCeass�{T tp F, �, s,l"4,;IeII z�'„.�,,��',,Rp{u ri : y+ 11,�� ,?I a{z�.�h+H� R F{� rruti aton�measuresr;ydentfied in flee, other :impact chapters*, r. the, g u ",R,ferto d"i.,...;41ir.Jl II r n A 4. 7, , ' I I t ; ' f �? �., I t •} , I a9 � I' tf �r l� I- Mu`{,'+ n� JM Y��y��7j` TI� I � .'Al 7 i4 JQPA+rn: w,nKiFr"° M.Me if�'j� >N rt'.k'F'tda Achieve , st MAfe: of Buildout 'oPu1a on -. ,?a:ecrc�+x '=u'-'°'Yob}+�Mk=V�n9`stdaM'iw:�`V�,dvexaac.:raCuw:...xwnrt araa..:nMeuaY+. `.M,e4,cr5Mreflswrrrarrkr�.'fimn.^P+tiMg+.zW�:'.ue::°x 4se. _ . 1 Usc:3osi , toig iJnits/AYi;"� rP�era�ns/Unit Rural Residential,,. 4!57 mei tJ M.: �'iv.1 t�aw:�ryRes d-ntaal�r3.�f:,, ' -- MCedilun�lDensity'�Relde�tiai.. jki.�Y_- Nai:454��/r_�^,''w+✓klt�.✓ .' ,. Sh -Iigh-Densty;Residelatial 24 aurcet 4Browncl Caldwell ;195. �Wr�s x 3kj s'41 f y I I I i { I 1 1 A I 1 µ.i I , I: d 1 w : I I I I I 1 I I ! a I . I I I , 'I 1 I I I I' f , I U, Yy li 4 tot PEW Y rbf i�t� dO" U, f,PbpWASonad . fit 061MA lv,,� • ntlUse Lig"slgnauon�In�i�.S/Acrea�'ersbigS°,ilIitt��a'v"8CainCy Pwifif reSlcleXll�ldll, 2 .;.� �'�1 a� ,xN .:,�'{ < I�ovi��ilersity. Residential � � 4 yr3k�'. �, � � a,+ S l ecilum Deli Ads Kendal` h' �r ,.� t. PAI wl 6 _ •IwY��ww�r .' .:. � w�...RK 7 ...1 �.:1:'_"..^�`M:k�in Source, VAr�Vrs p "mi Con1In.hrV t6�f JYi �..6 tt� §( Or :I 1 I' J , ' I , I 1 I i t 1 �J I I It 1 1 1 1 1 I I I 1 i i I• 1 � I I I I I I I r iAN V 1 f �I �1 f` �i I „.. 4 jv l3 7 i,s A d 4'.-.1 9 dl 4 9•{ i t f% V yf 11 'Y y q 4 .. i:v �7L ,!P,� I�,I hY n of f i a i P y- k yp qq .� i' r +r• •v. h, t .f ;. {� 1 .,,r611 apten' 10-7 ' ��i,, �V�ll'� A �F rS,37r r .� it h�xiA�i�v DUV U Q SETING OF Tl'3[E NiATEIt1:P ij!dralagic, adid , and 1Drai age The City of ctuco'is located nn the northeastern portion of the aacramento Ah - at the base of the Sierra i cvada. Several creeks traverse the Chico area SOf''and cozi�ey storimwater. runoff. The region has a Mediterranean climate with wet winters and dry' (? i8 . - - �Prr 1 s summers. The a,yerage annual preopntatp vanes from �2 inches near the Sacramento . aver to 3l ranches in.',the fAothills. Stormwater runoff h' ,RN at tiimes;V`created lacalized :xlfloa�clm robl'ems un the, city aria';fh6 agricultural area west of the ei �E'la®d control S p projPcts” on 'L.ittle Clue Creek,ig IC'h�ca Creek, andi L.indo Chaff;►;Have helped' reduce ty,'. g goieiitial flpod'pros:` the amount of runo tleni ff that flows throe the ei reduenn bas a ,n~sxture of 1ogen space r and turban land rises. AAs the open ,pace, t The.. SOI ,. develops,, the amoun of unp rviowus surfacetar' a ui the SOI: will increase"N Chang "rn the and , impervioussurface area cause chaages m>runof f patterns ' "7' `� `f ��`'' ��� a x� , r In much , of thex„ urban, area, 7devlopment has extended to the banks, of stream Anneis, a control n xtt a maximum, charn el size " a,� n , e ,f�capacnty. "Vegetation"growth in the °channels has also -reduced the maxnnum conveyance to less than their IIiaxitiiu.n cal'a.c�ty., ' i7rbazuiation may alter both "the peak and total runoff volumes df a` storm': The "°peal; nuioff T T at .r A x P VP'4n >< t �' i-0 7.i f it.. is thema�cimum "S that a sfream would convey for a partacvlar storm, ``For lame storms 1 f• Ti 'i, I� the peak flow, may, equal the•c annel capacnty� increases nn peak flow t�x'� ve etaion ueinsi' b I cause the'°fl' X g ty y ow to exceed' the channel capacity Furtherinaare' Sti`" �ri hod and streamli hank scour `may'increa§e'�ivith`�creasnng peak flow: ' '� �, , !', r � k . r �: �. The�volume of4runoff ge ' ;rated Burin is im octant be 7loodsn m e*, to tit " r g a storm p cannse rat may,.influence `wer aters a 'ar � . Bvy 'd areas near the Sacramento fiver Significant ,increases #otl stonnunof7vnlume maiexpand the`•arreasubject to flootliii `, ,Flciddn ineai'the`n�er p, �,Y�s fy tl • tt{ a.,F'h n J}.Pi '�P4} rc h }„ r a f g g+ i �s influenced thy„ raver stage and possibly by urba, runoff: Y f T � 7 d ,: y �� t " '„) t �� IYt � t r irj rt; } •, fh i i, ,i di II - �• ° ii1 Ul l "'! GI 1 ,r 7 ry, I s l Jt a, . i°` Y r If is y a`d 7/ �. 7A `v R ri '�'• t4iftucli ,� v ,, �''I'F t mi o�1113 tI"k v 4 Coatrifiuttng'Watersheds ;ry Ift a 1 xa a r rl�l ac ..a.Jd,4:."h 4�'4pf2 1•if!'{Y' „i:±{ f of Jv✓''f t ! av mt� i I i'.y Y✓'Y�hl • h t, Si t a9r I t Pit � �(�fA I The Hca urban. area receives nuioff from. the Little' Chico ,Creek, Bigg Chico Creek, and IVlucl Creek watersheds (Figure 10-1). "Several small watersheds, nn the foo1. thills east, of toy�+n also cantnbute flow to l streams m the' n x a'�" 7 d Y {1 ksF i. i'�ni ac t r� AZA: �:i� � !� i Y 6I� t�.�° AA � r• Y'I Ir T f� Ic, "t � l ,. Note: CfS a cubic feet per sec n Sources: U.S,.AraiEngitreeis 1957, r $ A''14 �i Nit 1A 9�M S �:I �" iryiAe a yy N J. oY #,.�1o,J° i tf_dYi�.x�,4 i• GA u� ;-a .� s� ,fit r`��xf�'iC .�.l� Sr r..� �Au'u� itw�,�tiA �t'�i 4�,�t«1J �s4eY.��'�^,�'.� kit 6 AM p� Sturw &C ;i �,�. .r' �pere oC fluence. WY ;� tiY���• Y-^+P'�h td��J I k� �:ndA�dV�r�� � � A �' $C 1� e� f jl'. ki rd p'�. ."`�6'. .a77�u�`+�'�'�I��@ i z,•�'c�2�J C4 h'� �@�tl �i �S � rr t"�.'p�'F V1ypr, �pr�A��bY � �4 .. f�W... 'U•.�.+uM1 n �T+✓d� iY,v,i ':tJ }�t s�4y q4� .{� ��t �,r.� n� f �y w �, a aaarr f ,ftp r lDtitPpM�,,Pi�2 a' In 'rl=��`a �;lsu�l 4v�r._.!- ., >ao c a J•6.� �, 2; M A 1 r pp xt,. s� ?} 6 �Y5 -k �� � iMy;~ r C. x, ytx g%ix 1 � wa>•, .,k�'�a,•,,,�` .. �yR s � .�a i, ,t Y#1`5.d I# II r!7 Y 1" � k. br /J3•u .$ C 'iak � 1�'vh i4 srt?>124 �, A yl, ti tr c fess w� � 4i,'Sd RlinO p P w' ,9 ��r � ` ,�Dlversion y I s .. Si?'Gn�JVrai�'S��;'I�.44#.i05. l,ui N4z Chane%t Ns�roe Ca city (cfs), , Source Structureb'�a . . �I �'� sirdl� r�t� l' �stiFetCl& co, geek {000 Lnttfe C�uco Creekam 11 yu, {� }jp Q^ n. r ,'}� M �%YS� v{ie �k '•?^I�,j l: �i� �.r,' ;��'/g lAi'k.'��. i�1 ��17'!h �M,i r��,..��'�;� • :av, wet c►il l i 3'i�"1V{f rl„T ttr .. 1 yAn, "tr.�Al.tAA es' ll ter r.> rr 4'0. ' 1 , I pd��.�+�� /^'1y��fe .Gi, a •ryr',�v�,;r; {1��r,' thi d f rd nv r + � , tr[litlJ4, .. r reK �.i�t1C Ch�Ca DIVe�'Sion 1 hFl ae 1 y 3,' M P.3w -a'�r't4�'ii���"rtv n C� e,''�� ,"'4,ft _,�E h"� >�' a•'�„r�x � �a t1�r�,:�,'�.,Ri�.�`� �:�i ai����.'��iL i `'F.n [[[[�,-� Ai��r -.,Tare er4 I'm�^ ¢' ,Npth..'4 I,�ig(y�y,9�. I °�tr, rq'�I, � `� , , r ^ yr p Y , ^I (Irl�i' ♦f «�f j 1.. �, .i, � �:6 Q'1aN � Ci°1A3 :.A ,.,Y. #�' !IT rr) .�e{,r >k "r Y I -, yIl ) y 1 J �ry � ��g CbucoCreek . rr : Uam ftl� feci ertl�rrts' r144iQ y�.J �R ;�rA3E iP�irCriP.�l$'bL...J t+�i+: ,iu7,�'�' Ig Yi x > rb .c_, `p f� k pp A'��.�,�a+'fflv'tl �1M7y.',V A J4W J d �l ViT ;undo CbanneL Dam with concxeie u„ r w1?]?ngS hIY}�MO, E-2 Ai1NF ,.1 j} �l Ct#1 pp` M r'v1Fk F ,P , F U •.w ,^nfe_M-f,r,�'�.r,I�4X da7 a�& #Mtrs r Y�IYN4fYif�YM /�tiis�lt �iitlNMNflflrf �t "L�il qw,{d S. tl -�� .^�# $w .:FFi� �..'�tf �_1.�'� d� ,rl'..'i�l �.• .,.. w�l•r #`� t, t I,`. I K%'a+•"i�ClY r#n� ,1^Y� pp4Iln #�k AZA: �:i� � !� i Y 6I� t�.�° AA � r• Y'I � d IL{� �� Nllt C'•>v/�v .. tt .� � 1 i li ,� � : f f 7 � AI � ,t�Yl �,. , . � a � +��l�rdit r i� �{),5,;,� �.. f {..$... #1 t', r }� 01 . � l ,. Note: CfS a cubic feet per sec n Sources: U.S,.AraiEngitreeis 1957, $ A''14 �i Nit 1A 9�M S �:I �" iryiAe a yy N J. oY #,.�1o,J° i tf_dYi�.x�,4 i• GA u� ;-a .� s� ,fit r`��xf�'iC .�.l� Sr r..� �Au'u� itw�,�tiA �t'�i 4�,�t«1J �s4eY.��'�^,�'.� pp pp yy raa rn A. : r ke�1�r, Pit-tY 517 f`�1J isf�. i 1 ;x 3 i 'A4�tV" 4'. yy➢.�y 6 L� wx �I ,V �i 1Y jj WY ;� tiY���• Y-^+P'�h td��J I k� �:ndA�dV�r�� � � A �' $C 1� e� f jl'. ki rd p'�. ."`�6'. .a77�u�`+�'�'�I��@ i z,•�'c�2�J C4 h'� �@�tl �i �S � rr t"�.'p�'F V1ypr, �pr�A��bY � �4 .. f�W... 'U•.�.+uM1 n �T+✓d� iY,v,i ':tJ }�t s�4y q4� .{� � : a' In 'rl=��`a �;lsu�l 4v�r._.!- ., >ao c a J•6.� �, 2; M A 1 r pp xt,. s� ?} 6 �Y5 -k �� � , �;',� � 6 ,��, �� i : n f x°� .� � $�{♦: w�Ka ,,.° ��m•`� :�`u w, �� , �' �J�`.��,���§ ��C�'fl74 � 1 f 1 � wa>•, .,k�'�a,•,,,�` .. �yR s � .�a i, ,t Y#1`5.d I# II r!7 Y 1" � k. br /J3•u .$ C 'iak � 1�'vh i4 srt?>124 �, A y I s .. Si?'Gn�JVrai�'S��;'I�.44#.i05. l,ui •�°�tl'L YS 11"�' 'iw yG � tliLr; fini {?.,>'�: rybtyl:7 �t;rt iti4 S�iS k9' � � � '? • ;• Sy4 £ ,i3.S ,r f Rl N . >A I f 4 ,J k F .': :••tt 11 yu, {� }jp Q^ n. r ,'}� M �%YS� v{ie �k '•?^I�,j l: �i� �.r,' ;��'/g lAi'k.'��. i�1 ��17'!h �M,i r��,..��'�;� i 3 4'0. ' 1 , I 1 hFl ae 1 y 3,' M P.3w , , r ^ yr p Y , ^I (Irl�i' ♦f «�f j 1.. �, .i, � �:6 Q'1aN � Ci°1A3 :.A ,.,Y. #�' !IT rr) .�e{,r >k "r Y I -, yIl ) y 1 r144iQ y�.J �R ;�rA3E iP�irCriP.�l$'bL...J t+�i+: ,iu7,�'�' Ig Yi s',�,1 f4 ix '^,"{A C7Y �{p '#'r 'yfp {: q�i#i�{J 1 i 'A"{' "ten E'�` �:•qJ r'4l$7�. iy� C- �4'1Jr g `�.' i k � };11 + ����1 c'�� AP�,,,�,Ns ei Y ��' Ix I �1� s f •: A'��.�,�a+'fflv'tl �1M7y.',V A J4W J d �l ViT u„ r �j�x `PP I,} �N#s2i'1• CIO 2 M�r 'y,°ftf 11 �.i%✓� f k!b'�`' MF hIY}�MO, E-2 Ai1NF ,.1 j} �l Ct#1 pp` M r'v1Fk F ,P , F U •.w ,^nfe_M-f,r,�'�.r,I�4X da7 a�& #Mtrs t, t I,`. I K%'a+•"i�ClY r#n� ,1^Y� pp4Iln #�k f:•, � .1: Inc `I li ''.7. V4. TI ti E e„y i rY �1��R6, rea ,A I �,� pp ��i'•��,i �J � �7 I iWiv (IiNr ' `, �9i%I t �I YY dd�14�d 11y)� "A'� pA�1 �' fP pR ��!�!'�pp• I A% +� �fl^.,+ I`ir'r ,[ Y'i..11yy.i,p Np, aSY ptA. +A•,y r. �. Y, ;3i :•y X M':4 AJ.�.m� 1�.:�tLt•Au, iiu a I.n! I:w'i";♦, 'M �HA,N\i4�x oii 1J 3. �,Wk C,k i� &{C r.J yid � la Aa q f +✓+ c W M1t ~, � '! � 'tt- �.. � w,�, :1'I I _ •+.al� r If I � I I 1P$4 t , P ' � I I ' - s I . I at^ ,.:�.,.�..rb�,� ^s✓ ,tet � ' ,c� �b���.'��`- _ � A �¢ � Y � ' f � r y;. �� ,tea,;•. - .� s 4 + v7, a � �.e � �' » �'"•v:'� '� Tom-- �e - ..,c. .•.,1 t f'` s >x� "��r ,,���C�-mow, ,ry * 3 ����„ 'z .. - � s�<.••-+'. -� .' St.,�< ,�;� t ��'�rr� $ -'• �`-. 4 �-ti- " !x3 ,iwG� � Y �4' # six - _ �,.- - g - s �; ".•.._ -:,• ���=s- +.�,� ti I.Lit w -x-...�r'x,�•rt�E1� iso-.v3'� '"",. �:3' 'F �"'=`' '" � a _ ` �'""y�� . � -. ,�� �'�`�z^�'x=•'; �.i.�� R i .cis- � 4 a -e... s��` �'�`. `"'#�::}�rc.��.L �� r «��"1 '�„ i ;.♦' r �-�. y • '�': 'cK� ''� � �^`�� yA� 3t 9 4 c ,� ��0.�t. x2 i� `�' � "fir' s �"c''"��• a .� �� �.x, �„ . �-���y`� � -� , � b{ � " �'� � "� ��+'�-.,5 'i'�`t��-� � .• �'a x, '� ,,"�,c�,.'., a Rti-.`-�`x �-rt�:i � .� i 'i+ct' : ��Sj~ - --4=';d— e'er` '+'tz�� x,., � _ $� i r� �' •R , ^ "`.r „�� _ ti°� y of '�,-s't'y. �-tis'= � �'t ���� o-'"�3•�,• ��"� _ a , Y s r. C i A �2 u a 1 �� a"Vajl 11 4tirl, i f rT- asia4e.'�l'etmgnf �aPlanOpera on !yy} .. J7s,.,�� ..(��, s 4 +,` ,.�nr,�� r.,i- The City, of Chico s'CP discharges secondary Create wastewater effluent directly to,theacaramentpxR�ye�.��Tt�e�c�has,a,atioiial I'ollution1scliarge EliminataonSystem M ( )gipfor,�wasteWater discliar �. The IDES a NPJ;S permit, p ' p rmut species waste !charge requupmpnts for 4thelteatmeot giant effieuty intended„toptectl�eneciels uses o tie acramentoti-ver,{ including; fishing, irrruig:vi►ater,uPPly and a uatic babi t v to a c,ty r i 4 = 1 Ll y 1 is upgradug the wastewater treatment "plant capacity i&c�m 5r, mgd to 6 m d. g Co�nstnicta`nn is scheduled tastart in early summer 1991 (Dunes pegs. comm.). The expansion to b mgd Will Melude upgrading various plant pr�oi esses, ;maintenance activities, and an additional'. secondary clanfj r. The NPI7ES permit was revised last year by the R�QCB: when the old ,. permit expired fie: reflect, the ttew, plant u�pacity of 6'm gd "(Nunes pers. comm%); Altl'ou'gli they imefram:; unknown,, another tre�,trx�ezat plant ;expansion to , 8 -mgd rs planned to i d T ° [' z i'' j ac�cozumodat aidnitiotaaI areas that,�nll utilize. the plant after, septic tams are remaYed t, r carupartce-nIi.lthe titrate! action,plan (Nunes pers. comm Itesubnussion of the NPDES permit to tlaR?I(SCB`is regtired, before an increase i*r he�ca aci of the tr JS aPproveci ,, P �a _ ty tment plant i The 'treatment plant has two. areas 'of operational problemst' 14 temporary biological ovetloads' associated,, th,,large, fluctuations m California State Uni ersty, Chico student ,populations and r .4 nt intermittent hi h t g e upnt'ammunia concentration§ ' r J v n. r, ! .}u _x kp r4t r.r , l ��The �aydraulie overloading r , ' ,4"� F p: ablein,P occurs` approximate trace ,peri year wliep s ,,.. �' t ~students reum to cainpusbetveen semesters and is being corrected by,the expansion,o >-:67ingdrandhte use of an:aemer en effluent Stora a oi%d. Ammorr3a i5thi 1 x 5 �$ , �, :. fi z=g P , , �T „.,. y�” 9Pc to„fish- and,atherta uaticFl�fe,and#isrre latcd under the NPUES;pericuit, Effluent toxicity,testing s being conducted t `` ' 0 r w .•k x. v u a r- cl r a r o o Al ial effects of effluent ammonia concentrations` oA i A;1! rk ;Sacraynento Rader biota.,' 'het6 mgdiexpansion,will uiclude,pl'ant,process changes that uYcrease,a� s ` �� , iutriflcatipn (conversion of,ammorua to nitrate) of ,the effluent b'efore,discliarge. (I►iune_s pers: colnrn.), „ ��.�k .ryi - '6�4�ater Qualrty i the11ico Sphere of Influence as t J f r” °. it t t u'1 ' v. xr6 �`6i#�1t�r�i'� :,kdR�k ti r t 0 ,r p!'� , a+, Ais Aotad earLer, ll,storm drauiage in,tiie Chico SOLI " diverted ta', ve�nalar creeks:.'` x,Mud,kCre�k,t:d�nco,Channe h=dig Chico tGeeu �attle `Chic "` ° ,'"'� d .,k.,n a �a , . aM : o Creeds, Band �G:omanch' Cree. kBecaseof, tLeadelayed$hydrologic response in ea5tei watershed areas ht{lea dilnhori �s a ailable dor storm ater ;runoff pollutant concentra♦L�ons in Xh"e xcre�eks during ,anitial,sioly`t` .v , r t + kf L r ur a� �. d , �a,i� ^k�•YF g � enols and under low t] �P fxk x; 0 � 7 ,, ow, conditions r �4 ,.. ! ro .^ 7 t" r #� 4.J �ioy a' 6i 0 t AVr. 0tOM Ra ,Gj,,A �y,,,'� •/'� x YS�`';tr ��`C16in,i Y # tr#�4 �F , Gobtan�d �f`o ns�adpp#edgun v i i �� ,.. �t�ons �+'�ate x w hTP�� oticx x" thainn 10p►lJ d,Cainage,,tzns user 'aFermics �e eas ����• •.,e lPl�'b � sys#ems settiib �eI �' mutupal,'tes wi, '�.,W�thl .!>I �'�+s4 �wt1(JT.1, • •. k -. r'�u t3' zpra�bler Ga + app1Ang; ere rtscs,� uc sari tofre�luce o used�b „tub'os.totRJR, §.0 as,in u al,n. P llutant,F$�oad� Yn ErursofFse er cities and to fir& V al �eIS r�xn urbasa ru off' relaons wer -w G ithC P�t'p�t�forstarater�� . .. and protecta �, prom?, ated F to qu�ty of ats stors, ate t, ,scharg�s¢:requi es,thc Yn t qua !tY4114, aquatic e acing,< end utapleinant ��e"sing receivin wu►aat authori Pouutant a�`;Pra�•am of,` bes a �!�!uters,jcJ6mtt �' tYr to era#uate 't Jpr,gre of •� the maanagemen pgllz. um t d�schar t practiIces , en'Y 199p . bes to maaumum'.ezten practicabl ..(.0 n .Gi$MPs)� to :con e trol i 1GgM�_ r r'atN,�y1 �,�� ° �F . varo en x•41 }n�. 1e' �lty iof Ovso Iml 101 ions Y not: b is ]es,�ahan 1Qp a uffected> b this , +• ' �tY:eaulr� ,berpr�e subject �oWcver;;` 'VeP�t ixig because,.,te e 8y o `•ent" o xistrn A�un�c�paI .hepruut re u; P puiatio' g 'Port,`�naY1be afe s rmenfs tb x.1,99$ p�oject�ans the d� Y . t �"�:� ad� ' . strs ld,usrs`, clition, 1h u� Chico SI�7I'I'tNG Oil t to - tr'o t b tai t+ 5 t.YdZo �ai`:n t.JWJF?t t t� �i�j° 77 rE pan• � . �^ m ans is✓,f , y 9� t ., �� J w t f kl" i'i�� a oIeisettln�ar the master dans zhe a nn�;xat�an arca isl:in n 1 P area. cl ur; cr' tj•° des on U o.�ttze set�timgtfor �rr t- r h � � ✓ �S A�i� E .a w � ltia,}�.� • 4E t� � Pi'r� V nE �'mll �watJ "E {•9 Fla t.It fr d',' b.e�lltleX •-. v h� na" .�� t�yti t�f! Y s{y It 1i �� Ak k� k4{e(R;%1i,1. • J \ 1� b�% �li'�, Jj S�R'�� Yy'� Alk' r ch_an ggj con fixture of open space'" Y m 1e • Ys�nrnofF�fron�ath trurl nr , r P to a� lac in theanuexatio area north,to,�4tud��'reek. ezdentlal uses ?lie: n area, w I�r a t 4, iiln ge fa es are;; �,:; "� G k � f'., .1";1��+,'J,4 "�'3 '� � ,,4 ,�� t A .. Y e '�: �+�"1 n, � .'t✓pa y w w�Y�,`t( V" � h:t�� A aW ulM r••Era Spy aS tE ^` ��TJ � yi ,� yr �1WC E r. ie � °txFy����y�y`ry{�qw"� 117i7�,�� r� °bkr its of � v•�Wfr.Y.�y ����� Y, 1,J. 7 z I rt g_ �,'�,? 1' • p r Gli .�� 6 A r� r t r , t7 +.3' f '� I �a�se��tp f 1141M. 141M a ter p# xa#� fnq � M , C;ys ,�S�� U�{ +C� .� e9 (l" np jl e�} ,a $• �;"r N� �^x� fi.&f ptj6a'o, f1i.iB��oa�r I � the' +•t �t q, :dfa � i atV .il rt ,­k '4 1 4p .#1— j - � �41ky �q 1�h F k 1 Aj ii y 117A���>#,�'.k Eoi Vl , I , ^a. s I I t i i t , A. Y` � r Although the �prolecta?d�ed �a.rth�s IRS o mtota` u luence runoff>,fitorn ,the aontn`bi thij :watersheds (those ,eastof" the urbarea),, this runoffmay represent d !significant partian of the floodfl'ow,jpassing tlirougb the,SOl[• Therefore, the uaodel'includes" lB�g Chico Creek, Butte Creek,, Tattle Chieo'�Creek, and'Muid' geek: Pas t studies of peak discharge in Big CWOc ).Creek (�?�iderson 1979, [J,S. Aizay Corps of En . veers 19fr2 examined the instantaneous Bait discbaz a determlhed from a statistical 1p ) h g ;analysis af',17istoricai: reords:'}+e,�1.nalys cont#uctedfor this; exaYrunes,tie aunoff bydrogrAph produced by a 100 -year rainfall eveisit The event ehosen, Jor this analysis<is a short -duration eYWnt. ('The February 1986. flood was a long•dwatian event.) I'hegdore, the -L results., of this analysis are not directly comparable' 'to previous peak discharge studies. This analyss daps "provide the level of detail needed tit ;assess ,project unpacts. The design storm Ghose,n for the analysis was a 24-hour, 1061 year irainfall depth, distributed according to "au SCS '1Cype I rainfall pattern (Goodrich pets, comm.). The storm pattern does not assume snow i.a the .watershed. Results of the ltiii6it, Simulation. MbdeiIA ' Thr;,simulated;runoff;far,"exi€ting.conditi--his-l'reflects,theucflu�wnce afthe`, et!nitributing .tatersheds: ` The rmodel� results.�rsiiow�tliat the,; contributing: {wati;rshei�,'°� have.:a" greater �nfiiaen'ce over the flood :hydrpgcaphs passang throe i Chtco thankiloE:s ruMff from:!,,, urban ti urea. Furthermore, the floa�d hydrographs frc]In the contributing watersheds are not ibineident wi, A e;.urban hydrggraphs, except�foac =l[.ittle,; Chico Creek. This is tla'e°case for 1 „_t►otb;eyusting<<and future -conditions: 1 G ,-r�`�, lEtunof f'peaks Fabout k40 hours ;after tine start, of .rainfall, farfiLittle, Chico Creels, Butte, r. Creek, and Big Chico Creek watersheds•y Mud Creek ca llecis;rtuioff;niore.gwckly an,d,peaks at about '1.8 'hours. lead Horse Stough cantributes its peak `runoff after ! abo'ut ours F L { 1 watei�shedsoutside ,the SOlcontrol szcaulatev,rpeak flows for Bg,�Chico ,Crelt, iu�do, , k Di ersion, Stagy a Route 99. 'The, urban i~`hannel� Sycamore Cree. v ' and Mud Crepk?at area peaks, fust, fol,owed several bour&m,lateri�;, 'the.. larger ,,pe'ak of..the .contributing , watersheds: ' The s mI,A" runoff `from die, urban area„ however;` daps alter the projected peak in battle, Chico j, The change a' atfr butable to lite rapid peak of Dead ;horse ,Cre&2 @ y 1 ti E-• .i ih .: i� ✓4 S_w �',.. >;x�� �.� w '' �u.�.i.,_'?..5..5"a S►lougl aa, t , �J 7Che�Comanche7sCaeek,hydrographzwluchrda�es�nat recerve,noff.from,outsde'the rbaasrtea,�s�t�e only rime!ate,hi. ydtbgraphattpr�rpstern,edge c►fthe city that,respbpds soleiY, a urban runoff. $.. .. �Iprapnct. h�cxeased'�peak; o Comanche Creek�and,�Lattle Cb�co Craeek. Wfrom�the�SIQI;;for ��u`Yrl�"+'9M fated r,peak� flttwfrom- e;, 5 ncreases, for J;futur`e . conditions 1only';for' „I aCoMan cne =acit .arid 1L. the Chico r ek (Taiale, ,1(l-2) w GFor;!ttie c�tk�er ►htercourses,.,:tiie. r. + " X10-;12 U 1 r [ 5 �,.Y3.1v. 7.fit.t�� Rd 4" 1 o, mitigation meAsures 10.1 arid.10.2, �' rti 'Pnstateiti tiom�rCE / ',Cill�Ciuslons 'r s t�aan'si . Q �r gn�ficaint �f measures 10, and,10�2 a- _ . m „x cre isn lemenkil. �yr IAL ti,�s: _ u.cy,N.t I d,15�u 6P ►I�R'' Q., ' c�undvvater quality ,degr'aiati pupact: tiease.bin gr " an- attributable to reffiaval of�Eseptic ! Implementation of , draft: sewer pi an would ,eo ow "alli�neclion', te f all"c s•uig, aid ,o W.ure development iIi the Chico SCai to a single, centralized 5yytem of saiutary sewers. xn r; os t cases,,Ie}use of;s 0p '1t A`vv�rould a eliirzuY ated, ;'if'he=rein a at number.of` _v..alrof Lrptigeu in"grow Owater,quality iri.the lattg,tetm ;peptic mks'have';hcenri r�ntified as?;tiie:pf bAble mayor soureeAof.nt Cate;conta �snat s�rKiri the.. 1 �Ci�ico SQI aac�.vicni ,,.?3 a{ .. ty `Ct►i�clusion. Poem Ligation CE'O 9" 000c al r{ i=>' j ,� �,, Y , ,, ;, .ux ni � . ,.t "„ s�;, eiri�.r( ` ' �' 1„a,�tt ��a M ;G e,i rr'�'�J I'' . +. 4{'�� i} >a � � � t 3Pt t >x�� 'RJ tiation AWasuires a r r, No i jlation is re �t;i��id if®pacts Decrease in groundwater' recharge attributable t'o rein©valrof7rseptic.systeis., ;; ,, 14 �. Xinplementation of #he: draft wex.;plan:vduuld;,llowti-to Oneuoof1fdeve lopirient, cvtre:itly served by,septic systems to the qty's sewer system., lliminafing the use of a large, ifinber of. eptia systerii ,would!xesult a,,aaninor de rase= grburidv�ater recharge relative . to, rather. recb'arge. sour , rr,, P'reriifigati®n CEt A Gibcin iori. i ,, Less.than SigI1lf�Cant; ' r {��,, `,r (� .1$i � �s•. w u � ht3 ls,k..r t.�i B +r .x R , 1. � d,.�Ji A4 �+,:r•� a 4;.Mf � Y E7 � t a1P ii>r t7 t a �'Y \,.;�ti. 'r' A�I . p r iy� YI `GM l`A4 ?rt , � �p r +.: I S, pp rr�,,'* '` �� lJl ♦ �, i �� I`l i i { Up u i „L y '�. 11 ix `V 1� 1 \il �� I Qlalse u�l.�d t yAltF F f AI1 � Y & shk ���mS3 ' f";W h ��� � ((d j r � , n r t i