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HomeMy WebLinkAboutFILE #2 EIR BIDWELL HEIGHTS LAND CO. 9 OF 10Lydon page two C)ctober 13, 108:x. r land hav, h at least proposed 's lots in both parcel�s devoid of g some gentle Slope . Little Chico Creek flows southwest through the �reste rn flows parcel. Tributaries flowing east and west into the Creek carry d account for the c g �.o an, on-anc�-rid e 'opo- water intermittenkly, an y -water i gra phy that. dornznates the areas below the relatively-flat a upland ,ridges,. p 1 n ' Elevations range: from 525 to 780 ft along Little Chico Creek, and from 136f,) to 1,640 't on the upland ridges. , S01118 g t (lgiE7) , the �caozdin �a the Soil C,ar�serva�iori Ser - vice parcels are covered by sails of the Toome8"Fent:t :association.. ' I'oomes soil, which i:s doriiina`nt on the Slopes of the site, is: typ?cal]y a brolwn, slightly hard, cobb.ly loam, It 'tends to be fess than 2ft thick, but pockets of greater depth are present. Clay contend is variable. Toomes soil tends to have moderate subsoil 'permeabiSity; medium to rapid .�.�noff, high erosion hazard, low shr-ink=swell behavior. , and a ',',severe 1ir�itation rating' for suitability a n septic-tank, leach f�it�lds� Differetit soils are developed' Onthe D'oe N it p, dge upland and on the Chico Formation and Lovejoy Basalt (see geologic 'map for distribti.tiox of hese uri ;'ts � . ; Soil on Toe ': ill P,idge is typically a Stony, reddish-brawn'Cla1v 1oarn, which .in places is overlain by a shallow brok-rt loam. ` Th clay ,load gr_-odes "dQwri- r ward into w°eathezed volcanic= Lydon pare tour October 1�, 1981 1)entz to Bluff* through thte Tuscan Formation from near near Red recent study of this zone (ar=crood et al. 1981) Leads to those conclusions: (1) Faulting occurred after deposition of the -Tuscan Formation, and offset rock.,:; that have been radio- metrically, elated at 1.1 Million years; (2) The ',age of the most recent fault movement in tho zone is not known- (3) However the existence of fault: scarps 1 meter 'high near Red B1u£f suggests that some fault `rr %Tern ent "undoubtedly took place in the past- million years"; and (4) Folding oY •the Chico, mdnoc Ane and formation of its zrany Small faults probably' occurred in response to movement on larger brit deeply-buried Laults GEOLOGY OF THE SITE Three geological units, all gently inclined toward the southwest, are exposed oni the parcels (see' geological trap),. From oldest to youngest they are: C (l)' Tart, sometimes sandy or pebbly, claystane and clayey, �. sil:tstone of, tno Chico Formation. This sort and easily-eroded unit tends to be covered by rock arid. :soil debris ��ash, :do�,rn; onto i t fr,zt1 adjacent.adj4cent. slopes: �2) >arac.tuted black Lovejoy Basalt-. This unit is hard and resistant to ,er,'os. on:; consequently, it Zorms either steop bluffs r where Cut by a stream, or else broad; flat, benches near Little Chico Creek> Tb.(--':rock is,heavily f'rac:tured but nonetheless is relataveiy xpermoable, so that small Seops, spring , and boggy Spots farm at t1 e base of the overlying Tuscan Formation. (3), Tuscan 'Formation. corzs�stin a t,erna+ nc� :layers 0 volcanic=t�4udlow debris (tuft breccia} and ,volcanic sand.Ston:e and conglomerate. `�"hc much- to s are relativxely `in�pe meable ar�d inter =c' in layers cif volcanic sedimert� aro, rel 4 l�- perml�?1e as '.a result., trees .and brush a,licdtx t%cmSel�res in alixiost= hoizonta.l, strives on ,cat-c�n lnthor walls; fo',lowig e ?�me blr� rock. volcatxic-sedimerxt' layers predominat ix the loc,�er, part of',the Tuscan Format ion �rher;eas udr;low layers are domittan in, the upper part: Lydon page: Si x October 13, 1981 _ . Y y g � Y ) are i elativel young movoment within the last million ears. ; and ( 4) Modern recorded" earthquake activity within the zone show*.s that breaking of rock;-- at least at depths of a ` few kilometers-- isan activity occurring intermittently at- the present time. hydrological assessment of the parcels t,731_11 be made by Jori Anderson, so a fpm' general remarks here willsuffice. The �l only permanent stream on the site; is Little Chico Creek, but all the 'Major gulches and many OIL- the smaller ones can be expected: to carry l:ow floes of water intermittentlyduring the rainy season. Ancient crystalline racks of the Sierra., the Chica Formation, and the Lovejoy Basalt generally yield no or only 8--211 flows Of water to wells, chiefly from intersecting fractures or perm- eable layers of limited extent. Because the Chico Formation s4 -as 1, ' deposited in an ocean, containea stater might be saline or brack- ish, although flushing of any ,permeable. layers by groundwater movement. might have replaced. some .:of the otiginal salty pore:: i at€ t with fre$b water. Tile Tuscan 'Formation contains interlayered permeabl c � sedi- mentary) and impermeable (mudflow) Layers, 'faith: the 'permeable ones being more abundant in the lower part of the unit. Because the undte,rl.ying Lovejoy .basalt tends to bE. impermeable, water in the lowest part o.f' the 'L'uscan usually X4,11 -'not leak t:hrouch the Lavejoys! but will be transmitted' laterally, until it intercepts, canyon Walts. This r eneraZ observation is borne 'out by the presence o several small: springs in the lower part of the Tu can, wi t', nd autsici,e the parcels, and by the fact that a s h`n a well nea.'r th,e pond in IN V4 See . 7 yields a subs tariti a l f l�ov,= of water Trot a depth of Zpdt Mays, oral cammtnication ,, ictober 1981) . ;3inc ;e the well is` apt a.n eleva ti on a about, 1''6�i(} ft, it pEnett atc�cl to Within'l(10 �t . -0 the ptd ecto subsurface e:Leuati n of'! the LpVejoy aasa t, or within ZOOt ft of the pro'- jecte eV 04 o the Chico Formation..) 'Lydon page Eight -0ct4ber T�, a9�1 Under natural conditions, erosion activity is high in the soft sediments of the Chicoaxttation, very ;lo~rr in the Lovejoy Easa.lt, and low to moderate on thc� ,�usc n Formation. The lower part of the Tuscan, -where sedimentary rock predominates, is more susceptible to erosion than is the upper part. The upland surfaces on Doe 1 -,ill Ridge and in S-4 1/4 Sec. 2 have low erosion activity. Under conditions of development activity, the relative levels o= erosion. activity should remain the same, but erosion in all areas -except the Lovejoy should increase.. 1 F t ung Erosion activity can be mitigat- by Za]lo: proper design and construction practice. This includes use of IOW cuts, proper grading, and adequate wat,et-carrying and di$posa,l features on roads,, prompt reve4e4,ation Of construction sites, and-adequa to compaction o� fill material. �Jolcan? sin. gerieral.zed analysis of volcanic hazards in. the United States (�Iiu-7.lznoau'z ;1976) inoy'Chat what the site might be sub:jec.t- to d'_to 20 cm (2 to 12 inches) of ash, from a"lar!ge, eruption in the Lassen peak, area. A "large" eruption would be -1 one than erupts about four times as much. material as taus :erupted in the ;_A.� 1980 erupt an of ?it, St. Helens. The probabi;,Lity that 'such an event will affect the 's.its�' is verb* `low, because it would; require that a large erupt'on> unusual 'in itself, ca= incide vitt unusual daze -north high-level wirtds. hazards that, nx pos,e a s, niLicant prablem Expansive sail. hr W, behavior 0 Toames soil is classed as 3ati: ,(Soil' conservation aervice 1r� 7a . That or cy soil .on the C hi ca `orma t. an sliouI oe h gh;; , Cin the' izpl anti ' r, ages ; the sail inos :, ravel.-. , shrinkage `cracks scattererrresence o txnd, arid in soil indicate ,that; shrink-stael, , activity is rnoder te. - Eoi; in place, bud tends to %e so thi.tx that on theov'ejoy i _ clad*ey t- its' Shrink-sS,*e11 capaci ty "is immaterial. Eapartsiye soil can .cause data" 'e' to'bui.ldl n foundations , utility .cor►tz tions, and slab �rivek+rads. kitiaations "that can Lydon page ten October. 13 , 1981' if by _ rock type that is either, impermeable or, fractured a Y'P Buff i cierntly ; lacks absorptive_ capacity. Soil derived from the Gh---o Formation probably ie unsuitable dor leach fields because of,its high clay content., M% itigations that can be used in Soils that are only marginal-- y fields include using greater length of 1 suitable �. car leach leach pipe than otherwise would bo done, excavation of the leach field to a greater depth than assumed by the Soi,1 Oonservation Service e.ri teria , and' i f necessary', use of imported to Se improve filtration characteristics rockfalls. The Count? General. Plan ra°tes the Landslides and rock .relative risk from ,landslides on the site as "'modera S±e" Examination of low-level air Photos, and coverage of most of the 3 o Land - property on the round , failed to xeve� l any evzdence' slides. Even on the steeper parts o.c" canyon walls,- the strength of rock units appears to be great enough to prevent slides from developing. ra Rockfalls do occur, however. A rckfall is the rapid fall, z _ at least partly, through air, of single or multiPie blocks' of rock,. : rosiorj-res.Lstant, C1if -forming layers of mudfl.oW" debris irr the Tuscan Formation are underlain by softer more -erodible sedimentary 1aYers. As erosion of the soi=t material uncicrcuts the hard.` layers, material in small cli.fis breaks a•ay along .- 1 Fractures and tumbles downhill. near - material In places:, sma11 boulder -sized pieces of mudflow'trater.ial are scattered ever the sur`ace 'of the locY.er, gentler -sloping sedmer�tary 1a�rers; such rock rebris must have fallen and then rolled or slid to, its present posit*ioa�. ®" Large roc�:fal1 blocks tti=ere noL-ed a t; t.wo ,places, Wiest of I.itt,le �:hieo reek. `S`hey ire ,4bove the access road to the property, about 1200 a i7bb ft southt�fcut of -ltd JtalnctlO;r1 wl b the Cha}�s-property access road.: fi13 northerly spat ;gas two large blocks (the larger is about 10 ;z 12 �t S3 ft) `est ng at the down - ill edges of `a uma 11 im la.t bench Tho slop leaccS to the road below is' moderately steep:' Juclgnc from the qro<<wth of t,t'ees at L'Ydon nage twelve Jctoher, 13 , The se-verity ofU1 atnd shalr.ing depends ma,a nl an the dt star7c to the causative oarthqtaa3e, the str e ength o,, the eafth uzike, and the nature Qr, the soil and roc*k at the a Ffpoted sit(.-. The strer.,,,th of t,,arthaua�zes is expressed as magnitude g (Pxchter ' scale end the severity at damage in inhahi.ted ar(�as Od as intens' r`I Is eXpress- Y ( odi�led "Iercallt s=a1e) Sign ;Zicailt earthqua)ies I•:%thira about 2.7ttti O,. f the site in- elude one o� �I (magnitude) 5-7 near Stix liizc in '194 0 4, 5 north of Bidwell kark east of hico in 196, and?I 5.'7! in 1975. a t'-palermo n addition, earthgQa:kes havij.jq an, i.nteansi ty of �.I a:t k�cir soLrGe (rnacrnittxd Y304. recorded) occurred .11 in 192 east rf Stirling City and 19415 sout'zi of paradise (Pealet' al 1978, gitl Mines and Geology 1978) . [k-arap'irasinQ part cf the 1-Todifi,M„ 14'ercalli scale: V1: 'creak plaster and unreinxorced auobe ,crack; �rn.cia�t�s break:. I'll: peakrtaasariry damaged., same cracks in goad but, unreinforc- ed masonry, VZZT: Good but unreinforced masonry damaged; some- damn C to reinforced strLictures -;ithoad q Mortar and workrratj;iip loosc- panel walls throe. h ou,t.. Several smaller eatthquahes Tai than �6 mi:o : the site, to theeast mainly a occl3rrM follawi.ng the 1975 orovi.11o e rthquake (ma,-:Cs, and tlindh 1976) • }�i1e not' signi.f cant in Lean$ of damage, thio;= indicate that the zone o lineaments. «ithi nrhi ch the site lzes is an. area of or,, - xigr seismic a, A.n i nfcrred £atilt shown ona pI-1 of thol trout Plan is, tht sa�tc as the lineament thaw e toi'ids soa ' hiVo tni rom the center o` the north aline 6f:8 ti 1. 8 e auso t.ho site, lies 'Vithzn the rorthcrti x>�ton ion of he Foothills alt3t -��Fst na, and k�ecau�e tr�ic �3y4teRt Vis' q':�nera 11z cotas>_dered , capa�.l].e o� praucirg al 'macrnit earth uak q exp, e ��=art� t,uxa�erroszs. �.�^i,va�:�anal� llC pll ;9tQdi01S AMMclr .y ]n n#s and- oloctr :�taf 1979'x,1 is reasonable plantyin to e�:peGt �,k3C? site a be subjt*c:t ,to a m��grrit.`ttcie . Lydon page f.outte'o'n. < OctOctober 13 1981 o. ,. kcal, C,R. , et al. , 1973, D. rthquake epic:ente� map of Cali fog Calif . Div. Xin e:s and Geology Map sheet 39 scale .1 1, 000 , 000 . Soil Conservation Service, 1967, Report and general Soil map, Bunte County, Cal.ifarnia: 40-3, Dept. Agricultureo 33 pn plus appendices; map scale 3.:12S,00O: M i t philip Al,. Lydon California Registered Geologist 144 attached- :+sap- Geology of an area along Little � Chico. Creek and. Doe ?dill, Ridge ISI tl _ ` ,1 f � ,: f5 �'�-. %f t �. � u� tl'� �' � � r � q 1 l Vie•'. •.. ,. ... .. ..... .. 'A �. �,. ..�.�'..` page Ronk exposures generally conform with the 10-2o westerly did or have. had outcio,pz e r,,osed by fluvial processes. These exposures are gener, typically gray- :all,} limited to the. bluff areal and axe hued py.�oclastic tuff breccias consisting of endesitic and c.index fragments incorporated within a welded-ash or mudflow matrix. 'Vory 'Minor, if any; residual, soil has developed on these relatively- young,extrusive rocks. The safety and sei.-smic-safety elements of th`: Butte County General Plan indicate that:; 1. This project is ,adjacent to the location of an inferred' abou, four fault of unknotan actis�ity. It is also Located t miles from a histori"c:l earthquake epicenter of #.0 to 4.9 Richter 2i;gnitude; 2. The lir uefaction potential ai- these "soil, is generally loF�"; 3. This project is not 3vithin a potential subsidence area; 4. The landslide potential of this area is love to ,;moderate,• 5. The erosion potential of these soils is high; _ potenti 6. These soils :exhibit C low al mor expans veno:ss. r - tha s recronnaissance and av"a1-able jnfarnation the in, view of . r (in lieu special fcllowi.ng limitations should be ;impl;emented of site-4pecific i;nvest:Lgations) to insure the establishment of structurally-sound residential building-foundations: w .1. Construction should be limited to, ares of less than 25% slope; 2. Building foundationsshould not b`e est?ab1iWhed partially on so5.l snd partially on rock 3. Foundations 'sho"uld not encroach on upper-bluff 'areas ( %qi thin '75 feet ' and. should notbe 1oc ted downslope of nezr-verticcl bluffs;: " - lineaments `z. Foundations' should no,t be aevclou_rd on, rrac,ure (fau? t or,. ,j`o in 11. 4 y i7ursuant tv recomm. endetions in the geological-h.azarcls rf- -r- t (P. Lydon, 100 . Th, locations ox these IIheament= shown,on the enclosed i ?J Cs Appendix 3) ; 5.. Slaw foundation^ et,cludod unless they are total- ly, founded an ta.s, ".k. Al though such foundations J would j:robably pi o`y atisfsctory in,,most instances �rrithin the protect area:,, urrent i�ndetarmi,nant circ metan- ces (e, I 'i g, unc scove.reo- surf ac.e expos ze5 of cl ti C7ep' � s; f I si 4e-grcairg, operations that could' potentially remove the to mler :�«ur ce .rs0! 1'q' exposi, g- clay= e2 subsoa.l-- 'rl:�te,ricJ:i; and the *ride` ranre 'o-'; individual sites a•a:ilable for r�uild- ing : !'oc�;tz,on )" neces imitate this e:'clus"o�i " to:; avo.id e moderate' potential ar expansie-s,ai cone axon's". � ` h:. t 4 � .. . l .-. !• ' ` � i �' '• .Y /- � y a LI �(.. .. 1� f' W , � . ;♦ `. a ,. Hyl � i �0_ i ; �.A L .�! 1� . 0 -' �yy "'� 1, I' 4 N . �'' ./ ' �.� l �;. I i � � •� .l ',i I i I K �, � '' �.. e ' • • ' r d '. I T � 1�:. .fir, .� ft 1' i ��-0Y n ' � Jori K ANb'E:Rs©t,i . G`Ot SO;i TINS pivlL tf'la1NFCp :. . MYRTLE AVCt44''£,' "T LCF�WU.fJ�. old) a:.ta•7:19. CHICO CAL1F"ORNIA Wt5OV6 EXPLORATOR r, �t• sc * �: 'k xk �' �' Yc yt * 9; �' �' 1; 3• �: 9; �r''k do k �-'� �' �„ � �t �r * :f � 7r � z � * Y, it is k �` a@ : '!: of �'r it � 'k '�"•l''i: h4' ;� �• �' Y �' � it �' �: � � � � �: k *: �k yc' project �^ .y File - o. Date-, � .�, a 7 ryry taXCaVa E ion "' e: u e c xe�.. pit trenen oadctli, ' ch.a.nne� bare drif t type 4t 1E:,x F}ip slope: ' ". "� .r. � k ;t; � yr yc �, :� �c � :l• * � :E x r �: �• * 3: 'f: 5'r � -� � ;F •� 9c � 5� �: �' �; � x 3: Nc' 'j: ;: t 7r Ar lc De��h fihic���e ir0IM c.o- Glas i ic;at? Descri'i3:a rx! N F ��•a, �"1 1 !w i\ .w.r",,.s. . lzWrN'm �. : . : rwrrww�� .—.r.�.:,r,r�.r e:z.f'- r v A • au .. :. .. x. wr..« '�r._:�H .,"fir ene.+. •> .y, . x �.li �.: : �: �w AIR -;QUALITY EACICGktCt\iD. AZ CALCUL,-. ViONS r Ga'bdn f Atinoxtde 8 In AMBIENT AIR' QUAOTY STANDARDS -- lalifornia Standards' National Standards' Pollutant Averaging Timm Concentration' Method' reduce the ptevatlr60 visibility Priinaryr s Secondaiv ° Method' 1 hour 0 10 ppm ultraviolet — a Oxidantic (200 ug/ml) Photometr�r Ozone 1 hour g/m (0 Same as Prima � Chomtlu 12 ppm) Standard hoescerif Metftod Carbon Monoitde 12 hour �' 10 PPM —^ Flon £?isperslvP Sarno as Non -Dispersive i ft hour �- fn€rated Spectroscopy 10 mg/mt (9 ppm) Primary, Standards infrared Spectroscopy Ota mg/ms 1 hour 40 ppm. f` r (46 "/m') (6 ppm) Nitrogen Dioitide Annual Average -- (0.05 ppm) 100 u Same Primary Gas Phase Ghemtfurntnescence 1 hour 0,25 ppm 541tzmata Method as Standards (4'70 U91,W) Sulfur Did*ide Annual Average — 80 ug/m� (0:03 ppm) -- 24 hour 0.06 ppm (131 ug/m3)� 365 ug/mz (0;14 ppm) Conductimetric ParaosanilIna Method Method 3 hour 1300 ug/ml (0.5 ppm) i, 1 hour'(1510 r 0 5 ppm ug,r"mi) Suspended lr�,nnual Geometric 60 ugrm' 75 ug/ml 60 uy/W Particulate Mean High Volume �_ �_ High 11 fume 2=i hour 100 ug/m' 26Q ug/111) 1.50 ug�'m3 _ Matter Samplino Sampling p Sulfates 24 hour 25 ug/ma AlK.Metiiod No, 61 Lead 30 day 1.5 ug/mJ AIM Method Average No 54 ; Calendar — 1.5 ugrrttr 1.5 ugrm' Atomic Quarter Absorptiot, Hydrogen 1 r 003 ppm Cadmium Sulfide (h= ug,/mr1 ydroxide Stroeta Method Hydrocarbons for 3,hour l 160 ug/W (0 2.4 pprn)s Sarre as primary Flame ionization Detecupn Using (Corrected (6>9 a,m Standards Methane) - _ Gas Chromatography Vinyl Chloride 24 hour 6?016,�ppm Gas Ghromatoa- �! (Chloraothene} (26 ug/m�) raphy (AAS staff ; report "78.8,-3) Ethylene 8 haur_ 0.t ppm _ 1 hour 0,5 ppm Visibility1 -observation In, suff client am oht to (8i 116dUttn9'reduce the prava> gngj Visibility .' �; Part clos to Ioss: than 10 titles .hen the - �rctatwahumrdttYrts APPLICABLE ONLY IN TltE. LAO, -'H 0, A) BASIN: In d petitN01€1 ►i trig teat) -- Visibility I obsovation )n auffictent amottrti to � �8) Reducing, reduce the ptevatlr60 visibility Panicles Vr to less than 30 :miles ben the toiatwo humidity is.lessthan 74 APPENDIX D, AIRQUALITY CALCULATIONS Proj'e7t i;Ilissions and Impact ® �I Calculations of vehicle emissions from proposed residential subdivision in foothills about 7 I'll E of ChicOj Cts Assumptions: I. Subdivision would not be fully "built out" until about 1:990 or after; -1.990 used as year of analysis. 2. A ratio of 80 percent ears (LDP) and 20 percent pickup trucks (LDT) was used to reflect a rural lifestyle. 3. All post -1975 catalytic-confrall.ed vehicles are assumed, 4; Average seed of each p commuto trip is 45 mph (55+ mph on highway, 3a- mph or less in town): 5,, Average trip length -- 10.75 miles (7 miles from project to Chico, 3.5 miles j average Within - Chico trip, based on a T. Ferrara tri porigin-destination study daze for' City of Chico in 1970'x} R,riund to 10 miles even for ease its calculations. 6. 'hat . > Each trip has emissions from either a or cold s art. ;: rune ih exhaust,' and'a hot soak at the trip end. 7. Project would generate 2700 trips/day. . 385 Dt,x 7 trips/,DU (Using cauting trip generation figure). 1,. Number of Chips Wftl fiat or cold at t�'tis A.: Cars (LDP) 2700- trips/day x 0.3 (� t'at°5). � ,2160 x0:5"7',(tractoqofc0ld starts from of CA RBivapl. 2j w 6;6° 0.527 = 11351.3 oald start tri srda 3 2160 x 0.473 (fmcE .7ho.t start tr pslda w B. Trucks (,DT) 2700 trips/day x 0.2 '(% trucks) ='540 540 x 0.519 (from p. E-7) = `280.3 cold start tr ps/day 540 x 0.481 = .259.7 hot start trips/day 2. Punning Exhaust Emissions Factors (b/mi) - from pp. E-143-148 CO THC I�OY Cars COS 0.30 1.06 Trucks 4.33 0130, 1.12, 3. Hot -Start ineremental Emissions £actors (g/trip) > from p. E-1:50 Cars 12.20 4.09 0.46 Trucks 13.02" 4.13 0„49' 4 Cold-Start Incremental Emissions Factors (g/trip) . friag p. E,.151 Cars 103.67 7A2 1.38 Trucks 111.06 - 7.41 1.45 5. Hot Soak Emissions factors (am/tri p) -from P. E-153 Cars 0 0.83. 0 Trucks under 2-t tr t ' on` ucis. _2.. INCREMENTAL IJOT AND COLD START EMISSIONS First cab's (1JDP), then pickup trucks (LDT) CARS 1 trip: (cold start or hot start + running exhaust + hot soak) CO THC iia,. UNITS Cold S''tart Trips L, Cold Start 103,67 7.32 1.38 2. Running Exhaust 40,5 30.0 10.6 (gtri/ml x'!0 miltrip) 3. Hot soak 144,17 38.15 1:.98... gm/trip.J 11 °d.;i cold start, trips/day - 164,108.7 121692.0 13,636.8 gm/day Hot Start Trips 1. Hot -,Start . 12.20 4.09 0.46 2. Running exhaust 40.5; 30.0 1Q.6 3.-_ Hot soak - 0.63 52.70 34.92 11,06 gm/trip ` I 1021.7 hot; start tripsjday = 53,843:6 35,677.8 11:,300.0 ' gmJciay TOTAL CARS 217,952.3 79,103.9 24;936.8 gm day , n PICKUP TRUCKS Co THC _NO UNITS cpla Start Trips 1. Cold Start 111.06 7.41 1.45 2. Runing Exhaust 43.3 30:Q 11.2 3,. Hot Soak _ Q.88 - 1.5.4.36_ 38:29 12.65 gm/trip 280.3 cold start tripsjciay - 43,251.6 10,7313 3,545.8 gm/day IP start,Tr P_ TL 1. Hot Start 13.02 4.13 0.49 2. Running Exhaust 43:3 30.0 3 Hot Soak 0.88 56.32 35..01 11,,69 gm/trip 25.9.7 hot start trips/day = 14,626.;& 9092.1 3$035.9 gm/day TOTAL TWKS 5'X 883.5 19,824.5 6,581„6 gm/day TOTaAL GPc 4roin p, 3) 217,952.3 79,103,9 24,36:8 ; Trucks Gars = TO'PAL°E1iCLE EMISSIONS in gmjcay 27 5,835.9` 9&' �s28.4 31 581 4 a ��ll� tieh�cle ,a11 trips 0: 034 0 1Q88.�0.034 n 1ton5/day . , 4 _. _ _..gin 'EMISSIO NS IMPACT - 96 OF BUTTE. COUNTY EMISSION,w (Sac Valley Air Basin, VMFAC 6 C Data Project Increment - Air Basin - Vehicle Emissions Only % Projector 1990 Prediction # 1990 Calc. Est, Air Basin (T/day) ('I'/day) In Butte County' CO 3,2.13 0.3034 0:037 THC $.43 0.1088. _ 1..291 NOx 13.77 01i0347 ; 0.252 _ Source: CARl3 EMFAC6C run of Predicted California Vehicle Irmissions for ;Butte Co., Sacramento Valley Air Bashi Conversion 1 kg = .45 kg x 2000 lb = 909.1 kg (gym/day - T/daY) x 1 kg x IT - T day 1000 i 909 Factor 1 i� 09,1 0 n Y �5- I Sec, 24-1.63 SR -3: Zone. (a) Usos perm ttod 1'. One single-family dwelling per p;a.rcel, not - including tents, trailers or mobile homes, 2. Accessory buildings pertinent to the` permitted uses . 3. Agricultural uses excepting a minimum lot area of three (3) acres to be devoted to r;esidontzal use and the following a.dditional requirementsfor each animal kept on the premises: a. For each hors or head of cattle or swine over one yea.x of age - eight thousand :one hundred twenty- tive (3,125) square feet. b For each sheep or goat - two thousand (2,000) square feet, �.. The mi`nimuin lot area p er clt5e r Hing unfit shall not he less than 3 acres, -the provisions of Section 24-33 notwith- standing, S.; The minimum lot width shall not tie less than oiie hundred thirty ,(1.3 0) feet, the pxovisr ons 'of Suction 24-33 not�ti}th- standin. (b) fihe follos4�n uses subdcct to securing a use pertn'zt in eacY, case,. ® �l 1. Golf coursers and country clubs. 2 Publ.is and,tluas -pu} l is 'uses; incl,udin churd3 s, a�re�touse hosipit�1 i park, and p 1 ;� :ro�un;ds,,, schools and , publ i c utiO s .. 3. Saxes tract office. (c) Section 24-:i3shal1, ap11l.y 0xc0j t I ng lo lfadth 'end lot arca, 5. Sec. 24-1,26. PA -C (Planned Areal -Cluster) Zone. (A) Purpose. The'TA,=C" zone is intended to facilitate the development of centers of residential or ,light commercial activities or a combination thereof and related uses without �9 regard to the traditional limitations on lot size, road frontage,_ setback, side yards and rear yards, ,Said zone is to be applied only to areas determined to, be suitable for such uses, as evidenced by a development plan to be submitted by the ;appli- cant to the planning commission, and to be evaluated by reference to existing and °proposed land uses, the county gen. oral plan and any applicable ,precise plans, The final develop- ment plan, as approved by the board of supervisors, shall be bind iiig on the deveioper or subsequent o- hers as regulations for land uses `vithili the zone. Deviations from the said plan (except minor deviations wh 'ch do not increase the density or intensity of any use, change the character of any use or irtti,odu.ce any netiv uses) slialI require rezoning in accord.- ance �t tlz an amended development plait.. Further, said zone should be applied only where its peripheral boundaries can be adequately integrated with, the surroundin S puhlc road system.and surrounding zones without ereatii l; nuisances from noise, ,fumes, congestion or other causes. (B) Uses per�nittadr (l) Those uses �vhielt are permitted in the C4 (Light Com mercia') District without the necessity of securing a use permit ('2) Service stations; (C) uses prohibited: All other uses of land not specificallti� authorized under section 24-1.'261 (�i) above. are prohibited. (D) Lot rcgu.lcxtiO�8.. There shall be no ;setback, side yard,' rear yard, or lot width or frontage re- uirements in areas zoned PA -C; prodded; However, that v,'here a PA -4' zone Abuts a single- or multiple -fan il;T residential zone, the setback requirements of the, abutting residential -zone in existence. A at the time the t'A-G zone applicrftion is -acted upon by the planning commission shall apply tothat poi tion o'f the cluster zone; along the boundary common to the cluster and i'esid'entiAI zone; provided further, 17QNvever, that no sti'uCture within a PA -C zone shall ire located Within ten (10) feet of ,a common property line behveen the PA -C zone And. an abutting single; or, multiple residencial zone. ess s to eachlot or to:, the com- (E.) Aacredzzire»lents • Acces iron' area erti=ink said" tot shall- be provided in � accordance � , .NVjti the re(tuirernents ; of Chapter 20 of the Piiite County Code including improvement :standards set forth in the .the resolution .of standards. adopted pursuant thereto. " .., m veme;nt in said cluster Parcel 4elucula'r and,:pedestrian.,,,. a P . . atlecluate for the use in, ei, ded shall; be evidenced by' ,rights- � of-,ayorteasr'nfSITts granted 'on i4 final spbdivlsaon I; ap rIghtof-Way, o' -easements granted by separate.lnstroment purattant to approval of the kroard of supervisors. ])esirable ; minimum �1Fidth of any such easement is twenty c2, 0) feet.. (7i') Lot �coz e�d er Xo, lot (whon considwred together with its proportlonate share of any canumn space) shall be per- Igreater niitte4i building 'coverage than that permitted in the of used' for the: same pur pse , Yon for an Equal :,ire i . (G) Superseasion; In the event the xegulations for this zone clearly conflict with 'the terms of any other applicable or,d- bances of the Coling° of Butte except Will rig, electrical, plumbing and saWage codes, ilia Provisions inions hereof shall con- trol. The provisior*a of. this chapter shall be construed to he in harmony, with all such, ordinances unless clearly in conflict th'cra ith, AnY subdivision established in a cluster zone after the effactiVeL data of this chapter shall t.)e deemed- to be an "open space subdivision" for the purposes o section 20-3Q 2 of the Butte County "Code. (%.) Impro wnwi&q: All improvemen4s within said zone shall med the xequirements of Chapters 19, 96, 97' and 28 of the Butte County Code. (1) ? inkattm area: The minimum area: of any PA-0 district shall be three (8) acres. (J) Off-street: parking: Off-street parking shall be required pursuant to the following formula: (a) Residential uses: Two (2) harking spaces far each living," Unit. (b) Offices: One (1) parking space for each four hundred (400) square feet of ;gross floor area. (c) Retail stores: One (1) ,parking space ,for each three hundred (800) square feet of gross floor area. Said parking are« may be. owned individually, by the owners of more th;cn :one lot in common. (K) Prwdurahi Any application for rezoning to planned area-cluster shall be accompanied by a preliminary dei;elop- ment plan to be submitted: to the subdivision, committee for• review and report pursuant to section 2043 of the Butte County Code, As to form and content, the preliminary develop- merit elan rmw and 'the review process sliall conform to the, requirements of this Code fox a ten tace subdivision mob: Upon receipt of- the recommendations" of, the eommittce, the planning director shall set the application for hearings as , in, the case of other rezoning applicat Ens, (Ord. No. 17561, Sec. 24-1215, N-00('Neighl6orhood Commercial) 7,oue. (a') Uses permitted: TJses permitted shnil be l rpit P., d. to tha following: (1) Food stores, drugstores, hardware stares,- variety; stores, jewelry stores, boakstcres,.laundryy bar}►ar raid; beauty services,,"nnd sjmilar personal services. '(2)' Prof6gsrona1 offices. ' (8) One single 62nily dWel;ling "p'r' parcels not. including ; tents, trailers nlobtTr Nomas. (b) Other requirements: (1) copies of the site p.,1 an for the deN41.0 m,ent shall be, subzritted and 6pprove.y the public; works depart-, tnent, health depOrtmen., and the planning, corgmis- Bion. (2) :On ahy bouindary line which is a common property r line ith property classified; for uses in We R Category, a wall or - ew-obscuring fence not le,9s 'than five (5) feet or more than, six. (5) feet in height shall' be installed and maintained for screen purposes and controlling trespass; except where the wall ;of u building is on such. common property line, no separate; wall or fence need be installed along the portion of the Property line occupied by the wall ox building, (3) All buildings and s. ---.bares shall not be closer than fifty (50) feet from the center line of the street; except where the road is classified by the county as a Federal Aid Secondary Road, the rniniMum building setback requirement shall be fifty-sive (55) feet from the center line of said road. (c) Uses prohibited: All uses of land within the district not specifically ,author zed and permitted under subdivisions (a)(1) and (e')(2) [(a)(1) through (a)(3)j above are prohibited. (Ord- N). 1750, § .2, &31=M Ord, No. 0021,§ 2,6 -12 79) Sec. 24-129. P' -Q (Public, Quasi -Public) 7,00e. (a) Uses permitted: (1) Public schools;_ (2) Public parks; (3) Public playgrounds, (4) Publicly atiyner3 buildings and land; , (5) Public recreational areas; (b) J1 ifftmom lot area: None. r (c) 4161iv;t 0)i lot width; Nene. (d} hla�ti t4 tirt side ?hard., Note, except where the side of a lot abuts upon the side of a lot itt; att - distriti; in rel ic,h case the abutting $ide yard all be not less than. fig=e "5 feet and except Where the; side .yard on, the street side ds corner lot abutson an R dstrict, in which case the side yard apt the street side shall be one-half the correspond'i'ng fi ont yard required in suer 1� distri.ct. The`side yard requirements for resI eniial 'dwelli.ngs 'shall conform. to the T quirerteittsfor Any residential zone, ;(e) Alinilhizin, froltt'bard: None, except,buildings aid strue- tutu sltsll be fifty (i}Oj feet from the Ce'nt'er line of the road, e"Oept irliere the xottd.is classified as a Federal Aid Secondary' lload, tlt,en the minimhn setbaclr.shall be fift�r-fi�'e (5a} fee f.om the:renter'.litie of the road, (drd, leo. `1750, 1 2. cocklebur, hedge nettle, and others, On thisparticular property. B. Rare and Endangered Species No officially recognized rare, and endangered species of vascular plants have previously beqft reported from this particular property, but several such species ihave been reporte, from within a. few miles of the area. Three: taxa currently recog- nized os 'hare but not endangered" have been reported from sites immediately ad- jacent to the project areo,: Parts of the property containing steep slopes potentially could support two species on "rare and endangered'" lists, but such stapes are not,, slated for coristrucfion at this time, and they were not observed during the survey. BidwelIIs know+reed ,,t;�olygonum'aidwell'iae), one of the taxa re',cognized as rare butnot endangered, was observed at, several locations in grassy openings on slopes throughout the prote'ct s e. T .is annual easi yreseeds itself and presumablyis not endangered by proposed development at this time. Mitigations for rare and endangered plants do not .appear to be necessary. 4t f I Kingsley R: Stern, Ph.D. Senior Field Botanist Deparfinent of BioIagicaI Sciences California State University Chicot 95929 CA (916) 895-5361' 3, CHECKLIST OF PLANTS THAT WERE IDENTIFIABLE DURING THE SURVEY FOR RARE AND ENDANGERED` SPECIES, CONDUCTED OCTOBER 2.,4ND 3, 1981. COMMOi~J NAME SCIENTIFIC Trees, Shrubs, ''dines poison oak Toxicodendron dlversilobum Arctostaphylos` yiscida Manzanita Parry marixanita Arctostaphylos manzanita Digger .nom Pi Pinus sabiniona ' Rzdbud C`ercis occidentalis Scrub oak Quercusdumosa Blueoak Quercus douglasii r,----- California black oak Quercus kelloggii Irnwrior I ive oak Qv� ecus wlsJ izeni.i `; Yerba santa Eriadic �, tsh _�,___ tyrr� Gc�l ifornicum Buckbrush Ceanothus cuneatus —. Deerbrush Ceon6fhus integereimus Silk tassel bush Ga a fremortitii - -- Cal iforniabay Umbellularia'cal1fcrni0i Heterorrieles arbufiifol icy T;oyon Willow Sal ix sp'o Wild grape vitis califo►rica ---• a Cottonwood Populus fremunIt, Wild blackberry Rubus ursinus _-------- Parish''s nigh'}shade. Solanumpar%strii Cierriatis lasantha Clematis :Californ'ia brlckeye, Aesculus colifornica Wild honeysuckle Lonicera sp, Flowering ash FroxInus dipetalo ' S's n owberr y rivuler'is h ." Bi leaf mg Acer rnaorophyi lum ` Mahorlia sp' eon ra e , r , 4,. COMMONNAME SCIENTIFIC NAME Herbaceous Plants N'dvarret'ia Navarre#ia sp Ci Thistle rsium sp. Klamath weed_ Hyperic'um perforatum Twining brodioea Brodiaea volubill's Many-flowered brodiaea Dichelostemmo multiflora_ Blue dicks Dichelostemma pulchella Harvest brodiaea Brodiaea: elegans Pitcher sage Lepechino calycino Small-flowered dwarf flan Linum drymarioldes Nutigll's bodstraw Galium nuttollti Paris' bedstraw Galium parislema Horso-weed Conyza canadensis . Stephanameria Step hanomeria sp. Turkey ollei;n Fremocarpus setlgeru Rofflesnake weed Daucus pusilfus Wild onion Allium"sp. Hedge nettle Stochys sp, Wi I lowherb Cpilobiurn sp. Star thistle Centaurea solsttlalis Canchalagua Centaur'ium venustum Opposite`-leaved calycodenio CaIycad'enia oppositifolia Tanveed- Calycadenia sp. Juncus sp,. Cocklebur Xarrt�tumstrumarium Blue" curls -rid- it nna I niceolafium; Shield-broc ted monkey flower titimulusg1,aucescens ` Cuclvreed' Gnpphaliurn spr Pursh's lotus Logs purshianus Slender cottonwe'edMicropus califomicus"; J - 5; COMMON NAME SCIENTIFIC NAME Herbaceous Plants (continued, , Goldback; fern Bidwe(IIt kn. veed Pi rogramma firion^ g� u'laris California sandwort-^"""-- Polygonum Bidwell ice Big heronbill AreAren_orip californica -- Purple goa'etia Erodium botrys _ _ Clar',cia Cl rkia purpurera ---- Wesferrk i-nGrni nd glory CI-- a� sp. California saaproot Calys� tom_occidentals -' -------� Hansen's spikemoss Chlarogalu m p ome"rid'a � -'~ ' i essinVitt Set9 a ella h .__ ansem Dwarf mistletoe Less i ng i a V, Tomcat clover Arceuthobi`um sp. Srniallhead clover Trifolium tridenfaturn — `—' ~-------_. . Hooker's plantain. TrifoL pi mi;croceplhaluri, :Spurge. Plantagohookeriano -�-- Prickly lettuce Euphorb i a sp., `�" — Lactuca sernola Wild buckwheat " "- Purdv's penstemon Eriogonum nudum -.""`; "_-- Tidy tips Penstemon heterop hylla vnr. pu_ rdyi `" `� _..La Yarroyr t. yea fr_�t�i Achilles Common hedge parsley, sp. SkullPOP Torilis heterop�a, ----- =-�--- Hendersonfssiooting stars Scut-- el-- Igrra sP• .Mine ears �" lheon .h�r�drsot�i i Wi'Iq sweet pe, e Wyethia rrrnol I iS Va Cath rus'latifo1,iatassels --�- -- ,Silver bush lupne Orf � r . 5 a e P ftn-- fps Tumble mustard Cupinus c;lbifroits "-` Sis altissimum j. 6 COMMONNAME AME SClENTINC oo-AE Grasses Foxtoi! c:,hess BCOmUS rubens. Nit; grass Gostridium ventricosum Fescue Vulpino sp"; Smooth chess i Bromus mollis Beard grass Pplypagon monspessulanus Mediterranean barley', Hordeum hystrix Hai,Ygrass Aira coryophyllea Bunchgrass Muhlenbergia rigens VJ'ld oats Aveno sp Baby rottlesnoke grog$ Briza. minor Rescue gross Bromus catharticus t 9 ELI 'I Page 2 - Amphibians" Long-toed Salamander tlmliystona macxociaetylum California Newt Taricha torosa Rough-skinned Nawt Taricha ,granuXosa California Slender Salamander Batxnchbseps atrcnuatus Western Toad hufo boreas Pacific '1rae.1frog Hyla xegilla Faothil,l 'tiellovs-legged Frog, Rana boylci' Bullfrog Rana catesbe.ia,na Rep tiles Western rend Lizard Sceloporu occidentalis Gilbert's Skink i'+e.stern: Skink Bumcces gilberti Eumacai s}.iltonlianus S. alligator Lizard Gerrhoriutus multicarinatus N Alliga.tor;Lizard Gerrhonotu.,enerUleus Ringn,ec Snake Diadophus purietatus Racer Coluber constrictor Striped Racer Nlasticopb s l:atera.iis Gopher Snake Pi�.�.�ophiis rnelanoleucus Common Kiri�,srai'a Lampropeltis getulus Common Garter Snake Thamnois sirtalisJ 1"testern Rattlesnake Crotalusyiridis Bards *Turkey Vulture Catharte-. aura *Cooper's Raw accipiter. rooperi Red-tailed Hawk Buteo jamaicensis *American l:estral Falco sparverius *.California Qtzall Lophorty c�lifor;7:icus Turkey (Dan Hays, pers.'comm.) Meleagr.s gallopa'L'q * Band-tailed Pigeon Columba, fasciata bfournng Dove da nacraura Barn Owl Tyto alba Screech Owl 0tus. asio Great Horned QvI Btibo virgin anus Lo''ng-eared Owl Asio otus CommonX-ighthawk Ch'ot:deil.es minor Anna's Hummingbird Cal)Tte anna.> *Common Flicker Colace auratus , * keoxrt Avoodpect,mr, bielanerPC, for mi,c ons Downy Woadpecke*," Picoi ds pubesc.ens, ��uttall's, i'loadpec er Pi;co�des 'I I: i Westert �ingbi d. T Li verticali,s Black Phoebo: Sayox n� 5 ni gi;x V1oIet-green .5►.a 3'otti ''ichyczneta thalxssiwi *$orb J,1 Aphelocoma ciaerulese6ns Common . Ravon ' Cox vus cox ax Common Craw Coivu br" efiyrhyitchos Plant Tltm©u!e i?axufi i1no n41tus *Bushtat� [� aLti3 axuS' minimus � iv7tc t) reacted Nut�hat� lI Si'ttzi c'arcal�inen.�,�` *lfirentit Che` f.Ascato *Bewick',s 1`rxci Tltr}rottt.tite; bciw�a.cki Page Removal �r vegetation on'slope should e.spe i lly tie done Prudently since erosion potentialis,greatest there. ,In gene,: a.l., the best. Place for constrUction to occur twhieh wil.,l affect the wildlife habitat the least is in the level, pen areas. Fo—r the most ,Part, maintenance of All be beneficial to both wildlife and humin as much natural vegetata.on as Possible inhabitants. i i i , a.... ,. .. ., along the top of doe mill Ridge . Doe Mill Ridge is a north- east to south,vest trending ridge bounded on the vest by Little Chico Cres�,k Canyon and or. the east by Butte Creek Canyon. The majority of the project area, covers relatively level terrain which characterizes the ridge top, while small portions of the property area extend over the canyon rims and are characterized by moderately steep terrain. No permanent dra inagas are.: located within the pro ject area, but a series of intermittent and ephemeral drainages originate within the propertyarea that drain into Little Chico Creek, P small reservoir has; been constructed�rithin the central portion of the property tha 4 is ttil7 zzad to vrs.ter an orchard located to the west of the reservoir. Portions of the natural ve';etation had been, cleared at sometime in the toast that are now covered by chaparral., r The undisturbed. portions of the .. property indicate than the natural 'vege-ka-tion of the area was an oak -grassland with some pine and patches o+'chaparral.. Along the larger of the intermittent drainage charnels there are also various 'types of riparian vegetation., FrI L X I iA "lU� T�C% T UES ;' The focus of' -the survey vitas a visual 7nspec-ti,on of the ground surface for art ia.cts, topographic anoualies {e;� , mounds), differential .�xoil conditions, surface features and organic debris indicative ,, c:= prehistor�c,i a ive !merican actiyiuies anti for sucttzral remains and ar uifarcts end? cati'',e of early Buro-American a,cti_vitie The areas considered most sensitive for archaeological dues within tie pro` ect area were along the :drainage; c�hanr els and `along; the canyon rim: These, areas were examined as thorou-Ily as possible by th`e author.; The d,rAinage channels were examined by vra`! king a- tig-zagging transect along either side of the channel:�,e edge of the canyon r ,Y4 was exarnined' by walking contour transect i,s . along the, side. o the canyon wall, The canyon �N' Il was hxamined primarily r6r the presence ,of rock .ehelwers that ,z��ay ns�re`' been oocuup l ed bythe aboriginals pormlation of the area. The remainder of the property, :Loco ued l I g t�I rslat vely lei=e ridge mop, rva: di deo. r to 'three types of as:` those covered l)y dense; impene trade chaarralr,: 'bole areastha? V" ie disturbed by the ve e�`<a.ti ora clearinS a,c'tivities, and those covered by reiativel open oak -grass'_ Land :.f orIi'ms. of , vegeia s3. on. Talose, a"r, e s fliers ie.t'Y."tifia le on an aerial Pho t6, raph of :the area and hole cn a topography c Zap of the area,, The de�ss� chaparral areas and .the area di -tul ed by` t ve ei.ation is;les ring; were not ire estig ted'