HomeMy WebLinkAbout93-05 DAVID & RUTH MANTHEI REZ (6)UNMASKED?Ni, E RATIVE AREA fp/linear 1t.
Documented research has clearly dem-
onstrated that the INFILTRATOR' chamber
provides an apfimum Infiltrative surface for
leaching system& Mal -W states have already
recognized this and granted system size Te-
ductions accordingly.
The graph showsthatlNFLTRATORr have
twice the effective infiltrative surface area
per linear foot., This is based on a 36" wide
trench with 61 of gravel below the pipe,
assuming 50% gravel masking, compared to
Standard c_hdHigh-Capacity lNFITTRATORV
with 50% masking for INFILTRATOV sidewall,
and no bottom mashing.
1. Excavate 3' wide trenches and prepare infiltrative surface.
2. Screw the end plates In place and slip INFILTRATOr units
together to form desired trench length.
3. Run inlet pipe thru inlet end plate (pipe does not extend the
entire length of the system), andbackfillwith native material
(18" depth for -H-20 and 12" for H-10)
(Detailedinstructions available)
INFILTRATOR" CHAMBERS ARE CRERT
FOR MOUNDS AND PRESSURE.
DISTRIBUTION TOO'
MOUNDS
,ti •
INFILTRATORV can easily
replace the gravel in mound„
or fill systems, in either cr trench a
or bed configuration,
Instaiiafi on is much easier with no damage
to the infiltrative surface. The, site preparation,
design and construction of the mound system Is
prescribed by state code. and INFILTRAT IR Pcessufe
SYSTEMS'` installation instructions.Origin,Dishi"�ution Pipe
PRESSURE DISTRIBUTION,ply suspend a
INFILTRATOR` chambers are easily adapted .a pressure distribution. Sim hangers.
predrilled pressure pipe in mplastic-pipe
e top of the units with simple. foolproof
Supplemental installation instructions are available for complete details.
Strata
A Grade
°` chambers are maided from. a high density POW
1NFiLTRF70R rvious to all components of wastewater
ethelena and are ivmcPe rally tested by a Registered i -I0 (t.00 l
of H -'f0 (1 t.000
They have been HTO rating axle
Engieerand are available coed - or 0-20 (32.000 lbs,/
Ibs.(axVe wit" 1Z, of comp
with 18"' of. cover).
A,tiiigh rfort-nance, state of the art system. aced to
DOL! -
the unmasked soil interface area comp
gravet Wele"ns- tructc
Complete system delivered' in one pickup
® Fast & easy Instaiiatian•
Reduced labor & Machine costs, effect and mess caused
isEll-ninates compaction, sl
adold from gravel.
Easy i pecffon.
■ St;uctufoI Y s ong. K_10 and H -2G load ratings.
Department of Housing and Urban
� Approved byU.S. Depa t -
Development - Federal : lousing Authority.
Ig Completetechnicat back-up' information is available-
,,�tattee;r�r
fiaatcuchaatinlo8 1/D� itvfATRA10R s ben
� to theork
prdorrcn vAth rna tureen Inshucttons. p t« one year
eoi punt arraogd-tr ieetiw ujdtoc aUWnipd;'"tm6ntno+�t-'
foto d"W I 'metro tmS«syste dtncr �t � trait-
tureen ts} bOeT=1u0W1ttycostdrerrroor,d!«.
Trot«sr.
kutottof'Motibeuruts.-... . .f/)mXCum:;?Ei�35 .0 9
sterns approach to stormwater
The INFILTRATOR'" Is a=complete sY "inept tremendous design free -
management that gives the eng
or deep Systems that ml,
omtomeettheneedsoftheInda �ualsita. (heengineer can use
d require, no heavy
units combined with stors for and treatment, req cost
any requirement fa► storage
to backhoe for install'ation,,and citeliable
highly
equipment except
ffecir <e. A detailed Stormwater brochure_ is ova
il'abie upon
e
-equiesta If sty
ial problems or questions
you have
SYSiErJIS or your focal c+.istribufcr.
;,alt INFIL3RAj012'
• 221.4436 er FAX 203.388.6810
S`PSTE
r 38a • 6539 ffi
Suite 12 Old Saybrook, CT 06475 ea°203 8 . • .
123 Elm Street 3- -
• .. Systems tnc-
. LEACHiNGCHAMBE11:" atradomc�xsotlnflltroto�
INFILTRATOR "and MICRO-
r r:
ENGINEERING
CMI Engineers • Planners • Siweyors
December,' 13, '1993
Craig Sande:. s
Department -of Development Services'
7' County Center Drive
Orov.i lle, C, 95965`
Re: 'Oak. ,Highlands` PUD
Dear Craigs,
Asr you are: aware, Steve Lotti ispurchasing the Oak highlands
proJeat from David ,Manthe. Steve is fully aware of Conditions of
Approval that the project is subject to, and, is working to satisfy
these conditions:in every way., in order. to make the project more
feasible and, hopefully more acceptable to all.- parties concerned,.
he: would; Like to make. a few minor changes to, the. approved Flan. r',
is his hope: that these changes can be made administratively and
thatthe time delay of. additional public hearings can be avoided.
Therchanges,are as follows::
Revise. the Phase line so that Phase; One consists of Lots T,
2, 5, 6 &7'. The remaining eleven. lots would be: developed in
Phase Two. All a.Plicale: conditions of: approval would be-
satisfied
esatisfied during zhase one. A fire hydrant will: be Located. at
Lot One: in tine Lira*' phase and at Lot Sixteen in the second
phase, as approved by the Fire Department..
Enlarge the size of the existing "stock pond" located near
the center of the property and maintain itfull all year with
the aid of a. well and. pump located ,adjacent to the pond. This
should'. be an aesthetic improvement that is acceptable to
everyone.. Naturally, we will obtain all necessary approvals
including the: Army Corp and Fish. and Game. With the approval
of the: Fire- Department, the pond will, be used for fire water'
storage in, lieu of a tank or high output well (the common area
well locations would be deleted);
With the approval pp of Water, Quality, the Reclaimed Wastewater
Winter Storage: pond will be eliminated. Instead, an.
underground storage facility will be constructed near the
disposal area.. This should be a huge aesthetic improvement
acceptable to all. Underground storage will. be provided in
"Infiltrator." type units:.: Literature describing these units
are attached.
20 OECLARAi ION DR�dE
CHICO. CALIFORNIA 95926
91&8934609
Screw closed end plate in downstream end of lost unit
e'xcavofe and level 3` wide trenches to hold in place. NOTE: For serial distribution, or to loop tha
E'Prepare trench bottom and sides Tn, accordance with
trenches together. use an, open end plate- at e dow>>-
state and local regulations. (InfilfratE7r Systems reccmmes for the next trench.tronch, and run a pipe from the opening.
rcking stdewail and. bottom Infiltrative surfaces to eliminate:
smearing) Fill side wallarea to
screw splash. plate on bottom of open end plate. top of slots with native still.
"Walk" fill Into place to
`Screw 01 -ANI end; plate= Into inlet end (without interlocks) give proper support of
of first iNFILTRATOW' chamber with' splash; plate extending sides- THIS IS VERY
&i' pCRTs434T TO ACHIEVE
Into unit. FULL TiRENGM
Backfill to' a; Minimum
of t2" of cover often
C,,,Mpacfion and sending:
for T w tO unit: qnd 18" fc�r
— unit-. A`,'Ct i largo
rocW, it-, -The bockfiil Ma-
terial. CAUTION; Avoid-
vehicle, traffic on system
during construction since
soil has not settled. This 1-5
particularly important In
sand, since loose sand
offers very little structural
support. Most states advise
nvniriina vehicle traffic to prevent compaction of the nfit-
tace first ural: in the inlet end Oftrench with fn �rlocks trative surface. (After proper depm or cov�� w,..., , ,� ,, .•
clown iacG f i� cnd settled, INFiLTRATORT' leaching chambers will then
is
support vehtcie weight not to exceed 6,000 Ibs per axle for
distribution pipe through inlet opening in end': plate H-10 units and 32,tJt70 lbs., per axle for H-20 units)
Run
but not beyond` splash plate. Single screw maybe used to
hold in. place. Pipe does' not' normally rur. the length of
system..
® slip-INRLTRATOR`"'
units together, fully en-
gaging tnierlocksto form
desired d trench length,
a, To keep joints from
coming oport during'
construction and: yr
maximum strength joints
may be fcrewed together
with A seif drilling screws.
b Trench grade can be
checked withl a level` or
surveying. equipment:
r
Excavate and tevelcresignated area.
Line perimeter of excavatlon with geofexr,Ie and
place base layer of stone as specified by design.
MCut appropriate size hole laclosed-end plate for
distribution. pipe:
Screw endplate Into inlet end (without interlocks)
of first INFILTRATOR'" chamber.
a. End plates are stepped to fit in. either end" of trench.
Upper step fits into! inlet end and towers epin
downstream end. (vrith interlocks)
b. A. cordless drill andself drilling screwsworkweltfor all
connections..
Place first INFILTRATOR"` unitin the r3'et end of
excavation with lnterlocks.downstream, Placr<}rows,of
tNFiLTRATORS'" next to each other to achteve, daslrect' bed
width. Run distributionr pipe to rows of INFILTRATORS'"
according to design requirements Run distribution pipe
through inlet opening in endplate Fi�eC' r,ytrurr ;t c
length of the system.
Slip INFILTRATOR' units together, fully engaging
interlocks to form desired bed' length.
a: To keep joints from coming apart during construction,
joints may screwed together,
b. fled laterals may be kepi from shifting by tying bottom
flanges of INFILTRATOR" units together, using plastic
wire ties thru molded holes at random locations along
rows.
Fill side wall area to desired depth over top of units
with stone and cover entire in.;tallation with geotextile as
ped lied by design.
Backfill to a minimum of W of cover after
compaction and settling for H-10 units and 18" for H-20
units, Avoid large rocks in the bac-LTHI material, CAUTION:
Avoid vehicle traffic on system during construction since soil
has not settled. This is particularly important in sand; since
loose sand otters very tittle structural support. For a large
bed that cannot be filled from. the sides, use a light tracked
vehicle end be sure to maintain the proper minimum of
compacted cover beneath tracks at all times DO NOT USE
WHEELEDVVEHICLES ON THE BED DURING CONSTRUCTION
INFILTRATOR SYSTEMS'" recommends uskng a well graded
soil for backfill to maximize load carrying capability. NOTE --
A we-j';
OTEAweii graded: soil contains an even distribution of about
10% fines; ranging from silt through sand to gravel.
c.
Engineering designs may require a multilayer system. Fallow Eliminate the problem sung ,�krater on lawns and keep
previous instructions, adding additional tie.sofINFILTRATORS" stormwoferaway from foundationsvothanINFiLTRATOR'"
separated by a stone layer in asimilar manner. Tiers- must be chamber downspout system. The system also meets (where
perpendicular to each other and must be constructed using applicable) stormwater recharge regulations.
14-201 units. To insure proper support of the system and to
prevent settling. 1'h" to 2" crushed stone or 2" to 2'h" gravel
must be used:
a. Run distribution- to the top tier onty, wil h gravity
distribution to the lower tiem
b. Distribution: need only be rurx to rcmrs Tr' Dr
engineering design and' not L- -�
c. Single tayer systems maximize a
minimize construction costs.
d; Multiple tiers may be used to achleve .any
storagejretentlon gaa..wi,h minImuntsysiom footprint.
e. Oeotextile ls.generotly-no= used beneattisysterm
�.
INFILTRATOt2 - - GRAVELOR' SINGLETIER
�.
UNITS GEOTW.VE cRm[D5TONE
s
nom.,
r. T
5TriB9CE F� -
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LIMITW WARMTY
Cal Ttx,un,etwot uSlWrirydooctl W+FG.tRATOTY'orut wtsoeiuutalkfltaaeeaaericewitntr�oc- -
twWs. inStnxii9rlS "s w<aronfoii t� tna pnavrd fxnClla%or 000?ast deloclN+r rnater101s an0
Wou n=0up W one Voar ftcen- Wo dMervoctwo- st"Id a t1efoct oDo97r Wim this
wc=ntp Ponca. wo-Mw mur ,storm tr ilworsystitrns n'a d ttxr aotocT nnitaa fila xt (T5�
u.ar�i,on f teas arartncvlralnitalcG�diottixxIgiratorSy:toms Itaadit�SFeraalF€
W ME WAMAMY IN SIOPARAM"t(a) 6 ExCILt:IVE (HERE ARE NO OTHEk WARRAr7TIES WITH
RESPECTTOTHEUNMINCLUDING1,00WARRAd1TIE5C MERCNANTABTUTY'OROFFICNESSFQI?A-
PARTtCUiAR PURPOSE THEWAMANTY SPE
GwtOR kIMPEctgMMGE5 TFECOMPANrSAUN0T9ELV�8tEFOR PENALTIESOR 119U(AATED
DAMAGE£- IXDNGLOSSOFFROCtiCSKNtANDFROFiiStA80RAF>D E2ATEPLVS OVERHEAD
COSTA rSR0Ft M tOSSOR E)LPEF1SE INCURlrEe 6V WYER: `SEGFICALLY fxCLttgEO FROM YlArt
- RMrfCORAGEAMPE-DAMA.C-ETAtitEUtMo
IWCwiS[x1EtOORq�w�mWF3UtAkE1iFARaiITERA
ACCOMr.ISE. AMSE OR NEGIECECr FHE tlNtrfe TRE UrIIFS ITEINCrSUTUECFEe TO sTRE'�-+Ei
GREATERr M0KX,ETV=t55ED r7 ti PUTA4UtttOrrR+SCRticrif7r,S FHEF3ACEMft7rBVEk rErt
COMPAJOPER MATERVii ; WTTG WYER YSTiM OR ANY OTHErf EYFNj NOT PAU'Ei18 THE
FURTKMAORE,rtaiOEV'cW ILFTECOWAWBERESPONSMLEFORAW',OS.�ORDAr�tl,,ETO'
THE[fUYETLtHEUN1TSORNJY.1ft1RDPMTYREA:tu7G FROM R5IWAr1AT;OMORSM MWt-AffM
SFtALLUSOEELYTTESPONW FCAENSUR.NGD4ATHv ALLATIONOFTHEtYSRA4*COMPI'TEDIN
ACCORDANCEwTHALL Ar'. YtAVaCODES MES.ANORECAMTIONS;
Cadt,"NNERVAWAT50EVERORTOEX1E D14SWAAARAWNOWARRANTYTMAMESIOAW, RAtM tN AW
PARrY
OTHEIZ TIM TaTK
X ;a
t Oaf
lk
SYS F M INS
r �
,: � ty �.H�y.a�t � aati s.`t1t ii. Zt'..i E`n ••..>Yi� isr
�4, i�.:a,s ' 4�S`ix ♦ ,d ` t 1¢ `� t � c a � t a3�gtit1C3�'�
s4.'^ r 1i ni �i : cti a i -.�� %l;�r<'?� TF :,`�% ati-�+t : r• .a: °:t r`
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2 ••i 4n -i: r
AC ESS -PORT,
Access port at the top center of each unit may be cut nut and:
used for venting. inspection or manifold connection. Insert 4"1
pipe through hole and use a coupling, ring as shown to keep
the pipe from dropping into the- chamber.
If you have special problems or questions call Infiltrator
Systems, Inc oryour local distributor.
383-6039 FAX (203) 388-6810
PAM. NOS: Q, 754 b6h and,5 O T, tk11 Can oon and ether Wtenj� Pendine
WRLTRATOR`
GRAVEL 04
DOUBLE TiER
- GEOMME
MIS
CRU241151W
Mir
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suttAUtE nnSE
LIMITW WARMTY
Cal Ttx,un,etwot uSlWrirydooctl W+FG.tRATOTY'orut wtsoeiuutalkfltaaeeaaericewitntr�oc- -
twWs. inStnxii9rlS "s w<aronfoii t� tna pnavrd fxnClla%or 000?ast deloclN+r rnater101s an0
Wou n=0up W one Voar ftcen- Wo dMervoctwo- st"Id a t1efoct oDo97r Wim this
wc=ntp Ponca. wo-Mw mur ,storm tr ilworsystitrns n'a d ttxr aotocT nnitaa fila xt (T5�
u.ar�i,on f teas arartncvlralnitalcG�diottixxIgiratorSy:toms Itaadit�SFeraalF€
W ME WAMAMY IN SIOPARAM"t(a) 6 ExCILt:IVE (HERE ARE NO OTHEk WARRAr7TIES WITH
RESPECTTOTHEUNMINCLUDING1,00WARRAd1TIE5C MERCNANTABTUTY'OROFFICNESSFQI?A-
PARTtCUiAR PURPOSE THEWAMANTY SPE
GwtOR kIMPEctgMMGE5 TFECOMPANrSAUN0T9ELV�8tEFOR PENALTIESOR 119U(AATED
DAMAGE£- IXDNGLOSSOFFROCtiCSKNtANDFROFiiStA80RAF>D E2ATEPLVS OVERHEAD
COSTA rSR0Ft M tOSSOR E)LPEF1SE INCURlrEe 6V WYER: `SEGFICALLY fxCLttgEO FROM YlArt
- RMrfCORAGEAMPE-DAMA.C-ETAtitEUtMo
IWCwiS[x1EtOORq�w�mWF3UtAkE1iFARaiITERA
ACCOMr.ISE. AMSE OR NEGIECECr FHE tlNtrfe TRE UrIIFS ITEINCrSUTUECFEe TO sTRE'�-+Ei
GREATERr M0KX,ETV=t55ED r7 ti PUTA4UtttOrrR+SCRticrif7r,S FHEF3ACEMft7rBVEk rErt
COMPAJOPER MATERVii ; WTTG WYER YSTiM OR ANY OTHErf EYFNj NOT PAU'Ei18 THE
FURTKMAORE,rtaiOEV'cW ILFTECOWAWBERESPONSMLEFORAW',OS.�ORDAr�tl,,ETO'
THE[fUYETLtHEUN1TSORNJY.1ft1RDPMTYREA:tu7G FROM R5IWAr1AT;OMORSM MWt-AffM
SFtALLUSOEELYTTESPONW FCAENSUR.NGD4ATHv ALLATIONOFTHEtYSRA4*COMPI'TEDIN
ACCORDANCEwTHALL Ar'. YtAVaCODES MES.ANORECAMTIONS;
Cadt,"NNERVAWAT50EVERORTOEX1E D14SWAAARAWNOWARRANTYTMAMESIOAW, RAtM tN AW
PARrY
OTHEIZ TIM TaTK
X ;a
t Oaf
lk
SYS F M INS
r �
,: � ty �.H�y.a�t � aati s.`t1t ii. Zt'..i E`n ••..>Yi� isr
�4, i�.:a,s ' 4�S`ix ♦ ,d ` t 1¢ `� t � c a � t a3�gtit1C3�'�
s4.'^ r 1i ni �i : cti a i -.�� %l;�r<'?� TF :,`�% ati-�+t : r• .a: °:t r`
ys s
c
2 ••i 4n -i: r
AC ESS -PORT,
Access port at the top center of each unit may be cut nut and:
used for venting. inspection or manifold connection. Insert 4"1
pipe through hole and use a coupling, ring as shown to keep
the pipe from dropping into the- chamber.
If you have special problems or questions call Infiltrator
Systems, Inc oryour local distributor.
383-6039 FAX (203) 388-6810
PAM. NOS: Q, 754 b6h and,5 O T, tk11 Can oon and ether Wtenj� Pendine
9
1 4,
�� �rng:neE
otal Storrnv
Im
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•. !
lity�101ouu��
�rt 1
t"�1)AU�nnu Ia Will aWWIPIIIIOHW�Ii
1 fSiS��r't�L� ... bllig111 iiil��6t ..
P- "8/21x%!!11'•^JfaSse
r a �� t � d �� . � •e ',fir
5;.19 Arf F! .t.�t t. ♦''��+ rleg
— — —sig
f} ` n+17-
,. < :....d f�.r � '.' i .}: •.' :q ,¢ _. � :o .",C fir.' -';v r
INFILTRAT °' , 59 4and5*{�4'��!�dIdncndOtfierP4tentsPendtng
OR tsairaderin4tkc4fnfllfictorS�sternsk�c PA%N0547� v x ,f Y-
• ..•----rte--=-
IN,
ari
and Installed In
units have been spe6tfle;d
3t. JNFI�TRATOR -6d man engineers
Complete storipwatef-system that and are preferr - bY r
The INFILTRATOR:` ls�a COMO me( I tremendous design h0hdreds Of systems,, icallysuped
community tle jsonrrios and tegujajo� becouse thoy provide a techn
provides the engineering com t Wsterlatasignifi-
tfle drainage onmentallY sound storMWOW,
jrr�6mto effectively handle T, - -4 r1r.lGenvit
n, stone
t
tfni, INFIGRATOr ChOmbers-wfien comill rgs
cant, cost savi over tradl Ional
-6 er trench or
provide a-nyjxIMurn storage Vold ratio4n-eii6
bed config, I uratlonst&satl'sfy- both ret6n.tt. . J.
ar tI3 of storage)
deslgnboalsv'�lhe shallow IN1q9RXTbVr,6hdTnberccn.be lative cost comporlson (cosi p -
Re
bjrdrnen
dous,
-,�deslgned in 'a :slnglb- I( I �1 - - 1, �A '-'�
I ; s6r(cde area for rnayJrnLJrn.-d4,1JX,6tjon wh1I6 01-
Infiltrat Ve *j'n`d�4aterwhlch
crea�edsojjsepartlon ogro'
- 4 Mai
)� fly -Into -th
.10�Mhgfcicqln -nt and f
fits -PE
rYiQxinizqspOII;jtanttreatM(
- i--'--'
O'
'MPt environmental protpqtIonIssu6S Of3h sJNTOR
chambersnaolsotd eilgnedi��It1-tjetcdng6r6+Ions
th IliNfe'd ares and
onsitesvA..,
e
t6. maximize storage VOlUMe These syserns' MUST be
IncreasI depths� to groundwater. , , , T -
rididula 0 R
rt -,ach
-Instalted'using H-20unitsvAthiciyer'4pe,rPe
STANDARD
HIGH CAPACITY
SPECIFICATIONS INFILTRATOR"m
other as shMAIM INFILTRATOR"m
SINGLIETIER
kkz--
3'x 6 1/4" x 1' 3x 6 114'X I i
SIZE /3'
WEIGHT
3016s. V4 25 lbs.
1...!f u! -
J.
STOP.AGE 10.3 to (77 gal.) 15.3 (122 gal.
Fk
.. ....... $t'—:
r Utb�17Ep
17,
W4�
7-1617SI
II h INFIC10404-1j'J'-
won ft -
1r cvn-'4&[) BY sF'E0RcIIW :1-LUL)W M-11
DTOSaSES
... ..........
.? ... ...........
-------- SOHE PLAMI BY BUYER
"'F
5i .. ......... AMORNEC
ALLAMON i41RLCTK)t
EVENrNOTcXJSEDBYM
'2V
2te- zinc-49,ravel 4��MfORAWLOSSOR
-N07ICE: jA to 2 Inch crushed stone 0 - r EVENT S"I THE COWAJW BE RESPIC GMOM9ST5WLq"-
RhWERMOM IN W IRDWgWMWN
MUST be used. -,DAMAGET01HEBUYER.TWUNITSORAWTHMMEFORDMMNGTWINSW.LAIIONOF
ORSHpmENT.BUYERSMLLBE SOLELY REPOLAMOODMRULES
SWtSCON4PLETEDINACCM6MMWT14ALLAM"C"
WMMNS.
VJrIEOFTHECOMPINYHMlVEAUMMnyl'OCKANGETMWARRMW
-�% VArA*WApPUEST0
Vffi4EE'R TOE=NDT1jtSWRRNW-*-'O"
TY OTHr RIGiNaBuYER.
the TOR
are impervious to, most of . Orr qUeStIons call INHUM
INFIGRATOW0 chambers structurally if you have sPec101 Problems
chemicalsfound,instormwater-TheyhoVe been all_ SySTEMS- or your local disiributor.
p—nntEnnineetandareav
jastedbya Registered 0 lbs/ Mde with; V'ofoornoacted
able In both 14-iQ (16-00
cover) and -ft -20 (32,000 lbs/aIi 18'' of compacted
cover} W.0 ratings.
- It S`*Vt=i I t -1V in �c
(703) 388-6639 FAX (203) 338-68k0 t .
19 Old ScOrook, C7 Ob4�5
r=
FILe 6OPY
SEpBER,.1992
j
Project Description
and Discussion of Issues
for the Proposed
Oak Highlands
Planned Unit Development
Applicant: David &.Ruth Manthei
c% Heritage Partners
426 Broadway, Suite 305
Chico, CA 95928:
(916) 893-8982
Contact: Tom DiGiovann
O
Project Description
and; Discussion of Issues
for the Proposed
Oak Highlands
PLANNED UNIT 1DEVEILOPMENT
Introduction
This package presents a description, of the proposed Oak highlands planned unit
development (PUD) project along Oohasset Road, north: ofChico, which proposes to
create 16 single- family homesites and open space on 81 acres. The PUD design is
intended to minimize or eliminate k -tent; -1 impacts to the natural environment and to
provide a. fiscally responsible and well managed residential project. This project
application package is comprised of the fallowing elements--
• Proiect Description and Discussion of Issues: An articulation of project goals,
project description, and general pjan. consistency are presented along with a.
summary of prior regulatory actions on the prop;:rty. A table detailing project
issues and planning responses is presented.
Rezone Application.° A completed standard application.forim.
• WastewaterTreatment Plan: This plan describes the collection, treatment, disposal
and winter storage of wastewater generated by the project. it includes hydraulic
mass balance calculations for a reclaimed wastewater storage facility.
• `oils SurvgX : The purpose of the:survey was to locate suitable soil: for wastewater
treatment and disposal'. for the 16 single family homes,
• Botanicat Survev: Prepared in June, 199.1 following a systematic botanical
examination.. The survey covered -forested areas. as well as drainages > and wetlands,
and identifiedspecial status species.
• Devel`opmentPl 3e Ve�tin�Tentative. Subdivision This map comprehensively
S
d,scribes the PUD plan and: serves as the tentative map for the project.
Summary of ]Prior Regulatory Actions
The property has been the subject of previous eititlement actions and requests during the
last several years. In 1957, the property owner applied to the County to rezone the land
from; "U" (Unclassified) to "PR -T' (Foothill -Recreational, 3 -acre minimum.). This rezone
petition was initially accompanied by a tentative subdivision map application for 27 lots;
the map was later withdrawn_ Following environmental analysis. comments from
responsible agencies and departments -.'he Butte County Board of Supervisors voted in
August, 1988to rezone the property to "FR -5" (Foothill Recreational, 5 -acre minimum).
Sebsequently, an application for a tentative subdivision map for sixteen. S -acre lots was
submitted in 1989. It was later amended to a. first phase comprised of five -5 -acre lots.
Comments from county departmenand other responsible agerci`
tss exprmsed concern
OAK, HIGHLANDS PLANNrD UNIT DEVELOPMENT
-I_
OAK Ht.oR.LAN'D-s II.ANNED UNIT DE FLO?MENT
-2-
I
over such: issues as wildlife impacts (specifically winter deer range habitat), appropriate
noise from CohassetRoad, grading, soil erosion, and. scenic quality.
wastewater. treatment,
In the course of processing the tentative subdivision map, the applicant proposed. an
which required a use permit In March,.
I
evaporation pond for wastewater disposal purposes
1991 the: Butte County Planning Commission denied the use permit application, citing
incomplete infor.,ration regarding Ns method of wastewater.treatment:
L
Goals & Approach of the New Pan
IFollowing
a review of the project files regarding this parcel, Heritage Partners undertook
departure froi i, previous efforts at property subdivision,.
to plan the land with; a, significant
Several basic planning goal's informett,the new approach:
I,
1) Use PUD piannina to minimize my The clustering allowed b}? file PUD
enables the avoidance and minimization of development impacts. For
■'
method
example, the more compact character of the developedarea minimizes impacts on.
PUD establish permanent open space to
the winter deer range. Addis=orally, a can
the benefit of residents .nd the general public.
I
�t fl �,,s to wastewater treatment: A functional and aesthetically
2) �
nd disposal system is essential for any development to occur;
acceptable !xeau
in : A legally binding structure should
3) pTq i . r • ni ir�m at�c€ doer s 1 tli
be established to operate he commonly -owned facilities and systems of the
interest, a County Service Area
development. Also, to fully protect the public
(CSA) will be proposed to provide oversight to insure that these .facilities are
I
operated properlyF
Project Description
Lands
The Oa'h Highlands project is a 16-unitPlanned Unit Development (PUD) on $1 acres
limits on Cohasset Road. The proposed land use is
I'
located 1 mile north. of the; Chico city
ftButte County General Plan which designates the site as Agricultural-
consistentwith
Residential. Current zoning is FR -5 (Foothill Recreational 5 -acre minimum) which.
than 16 residential dwellings on lots of not less than 5 acres each:
would allow not more
The proposed project clusters the allowable number of dwellings under the FR. -5 zone
onto 25% of the property, preserving nearly 61 acres as open space. With the exception
road; all other
I
of the wastewater treatmentidisposal/storage areas and a portion of access
open space areas are to remain in their natural state.
I
The open spaces are to be owned in common for the benefit of, the residents. Other than
open. space, allowable uses shall be restricted tc
as natural wildlife habitat and. scenic
treatment where indicated;. seasonal wastewater storage, storm water
wastewater
detention, and.fire protection activities.
Adjacent land, use consists of rural residential: to the northwest and. west (Keefer Ridge
uses are to the south and east.
■
Estates Subdivision), and seasonal grazing,
OAK Ht.oR.LAN'D-s II.ANNED UNIT DE FLO?MENT
-2-
The project is to be developed in two phases as indicated on the development plan map.
The first phase will have 9 lots; the second phase 7.
Due to proximity to Chico Municipal Airport (approximately 2, miles to the southwest) an
avigation easement will be, recorded alerting allparties to periodic overflight occurrences.
Theproposed developed area lies within the conical surface of the Chico Nlunicipal
Airport as established in the Airport Environs Plan. Accordingly, due to the proximity of
the conical surface to the ground elevations, several lots wilt be subject to building height
restrictions as shown on the development plan. Contours will be verified prior to the
recordation of the map.
Utilifes & Services
Domestic Water: Common well and distribution
system to public water system
standards. A mutual water company will be formed to operate the
domestic water and emergency fire flow systems, subject to oversight
by a county service area
Fire Flow: System designed to meet county and state fire flow requirements of
500 gallons per minute for two hours (60,000 gal.). Well locations and
hydrants schematically shown on development plan map; actual
locations to be dictated by field conditions.
Storm Drainage: Runoff wilt remain in. natural overland flows, except where channeled
at roadsides and diverted in open cobble -lined ditches past downslope
homesites. Small rock dams will be utilized for detention and velocity
control. There will be sufficient detention to avoid an increase in peak
period flow,
Electricity Pacific Gas & Elecu-ic Co.. via underground joint utility trench from
existing overhead facilities adjacent to site.
Telephone:PacificBell. via underground joint utility trench from existing
telephone facilities.
Wastewater°`i'reatmenf
Collection: Standard septic tank at each lot, with effluent screen to retain solids.
Transported sp rted to centrale. treatment site via STEP (Septic Tank Effluent
Pump) to address grade differences.
Treatment: Primary -treated effluent from individual septic tanks treated to
secondary level by a central, subterranean recirculating gravel filter.
Treatment will include chlorination. Treated effluent piped to disposal
area.
Disposal: Effluent distributed over anapproximately 14 acre area by shallow
subsurface irrigation lines. Disposal by evapotranspiration via a
plantedgrass such as tall fescue.
Storage: Storage of treated effluent during negative evapotranspiration period
of December through February in approximately 1.5 acre pond sized to
accommodate a I00 -year storm:. event.
OAK HIGHLANDS PLANNED UNIT DE.VELOP.N ENT
�`
-3-
stem operation by licensed and bonded maintenance coni
Operation: Sy homeowners association. Maintenance program
Contracted by
approved by Butte County Health 'Department and overseen by ne"v Y
formed county service area.
yr i, i n h r� ins* ; r all
Hm n_
A homeowner association s proposed
including the wastewatese r er treatment faCtl )f owning and. tie nand domestic
1 111 in
common areas and and to administer rovisions as set
documents. other pwater and emergency fire system to common facilitieother
to be owned and main ained.
the governing. eva ,
by the homeowner association include onsite street; streetlights, common area and
commonarta landscaping, signage and similar facilities.
General Pian Consistency
The Butte County Genera Plan designation for the area, iand usesfo along his designhasset ation are oad ah of
Chico is agricultural Residential. The pr+.mary
agricultural uses and single family dwellings as isltt erefore eons proposed
with. elect :is a
single Family residential use at a rural density
underlying.land use.
pcelis FRSzrifc 5 -acre, nimur) which
itfothe z The zoningdisuzone. The.cri� or ns tency
is a conditionally consistent
The, neighboring Y
1) Cvnipatib City with neighboring amt alttUra d is essentially compatible with the
agricultural use is light seasonal .grazinb,
compact PUD plan_ acAdjacent rural
Evidence of adequate. water ad 9 and seluage disposal a pacty of water supply. A table.
residential uses at similar densities indicate the
and map of wells rovided below. The wastewater
serving nearby resi e the PUD plan Th
disposal system is an intee system is described in
g'al feature
an attached section.
3) Availability of adequate fire piand iS described above a d sacilities'. An gchematically sh, fire, flow own on
is proposed. as part of the p
the Development Plan and Vesting T .ntati e Map.
cess Ivtil, fF •.capacity
4) Adequately u:uintainel approved road acltassetrRaad and Twill be built and
project will contain an. access road off Co
maintained to county standards. 01 . commercial
5) Rease-nuble accessibility to co fu Viler soutcial h on Coh asset ices and Road; schools are.located
;eivices ale located 2-3 miles
A:: mile:; south on East Avenue.
OAK HIGHLANDS: PLARNED'UKIs^ DEVELOPMENT
-4
DeVelopmelntIssues & Project Responses;
le- serves to illustrate the differences between the current PUD
The following tab A e The PUD approach clea:y
application and earlier attempts to subdivide the property.
res onse to environmental issues a�pd potential impactsz. and provides a
enables, a -planning. P
solution to wastewater treatment and, common facility operation and management_
suer'Itipuctrrlihal<?xtt9ect
1>t3lli.t'lan
incompletely ad Used pond for System completely addressed and solved.
Wastewater lncomp y � Collection, treatment, disposal
Treatment disposal of wastewater. accomplished with common, accepted
'r<iGtices. Reclaimed Water Storitgc
facility for winter.:montiu only.
$PCID clusters dwelling units, minimizes
VJlldlife Development covert d ent rc S T acres;
concern cxpresscd by DCPt. CtCFislt and impacts on winter deer range, of total
Impacts 1, lands 1556 remain in permancnt open
Game.
clustering enables effective, etiicient
Storm:Uraiaage htrt address.il by subdivision gropos[= i_� ry of rock lined ciitehes and detention
&Erosion accornptislt goal. of no increase in
Control 'at; tloW.
Subdivision covered entire site, inctudir M� e
'e!lables complete, of
Wetlands
Impacts �cene wetland habitat; likely signiticantimpas, t-� �'•'etlancl.areas on the site.
uali Subdivision coverectsctc withone h--., Squapty is preserved. Most homes
Scenic Q 4Y
per 5 acres. Most would be visibiz Siam wou:�` oe screened by oak trees. others
CohassetRoad.� -.�
PUD establishes 3Wtbackfrom
..
Noise from, Lots.designed withoutsetbacl. trc n Cobasset Road:
Cobasset Collasset Road. .._
i, roach used all la end PUD approach -uses clustering yielding
Site Planning Previous app ace; one: access point,
required two access polo' fvt't;a` !'hassetti majority oC open sp
--"'_ 1 2: 3 16 15 14
5'4
fi ( 2, 3 4 5 / loll 1213
V I�s6
z
t i i
11 I, 10 t g g I' t
t t Open Space;
1213� 1�1�-15
1
16
rOAK ,;' GH HLA PLA14NBD UNIT DPV>JLOP`Mlirt I
k
I
Airplane: traffic from Chico Municipal Airport was regular, and relatively
non--intrusive, The primary flight line approaches for landing and takeoff are
over five S miles from the pr*;�osed subdivision. The nearest overflight path
appeared to be over three miles away. Lb~;.�Y a3 craft were heard in flight
paths to the east, but did not produce any erxec'� Ole noise meter.
Automobile „"ise was ,averaged by the Lucas CEL, wh ,.,lz also ,Lorded the
peak noise even$ aria duration at each measurement period, The ambient noise
Vitas 42 dB during the measurement period periods with no vehicles or aircraft,.
A five minute interval, was sampled at the first NAP. It produced an equivalent
noise level (Lnq) of 59 M. The peak event was a light truck at 76 dB. Since
there seemed to be a high tire noise component, the SLM was switched to "C"
4,ica.le and this produced an L,,q of 63A dBC. Aircraft overflights produced
obort term episode: of 60:8 to .64 dBA.. Larger aircraft fling east of the
area produced noise levels in the range of 30± dBA,
3 The vederal Highway Administration (FHWA) model for estimating day-night
noise levels (Ldn) from traffic volumes was used to compare with the mid-
! morning measurement:. Traffic volumes for 1.591 and earlier years were obtained
from the Butte County Department of Public 'Rorks, public Works engineers were
interviewed about variations in traffic, especially with respect to heavy-duty
trucks Heavy-duty trucks use this road at irregular intervals depending upon
timber harvest and ronstruction activities, but do rAot constitute a signifi-
cant fraction of normal traffic, volwras.
The FHWA.model, produced an.Ldn of 57 dB for: current traffic at the
rock wall and 46 dB at 300 feet from the 0,,Ie of the nearest traffic lane.
i ppTUPt NOISE ENVIROMaiE
Use of the FHW;A model produced 1995 values of 57 and 47 dB for the gate
area and nearest edge of a residential lot. Traffic levels would have to
increase to over 6000 vehicles per day to reach an Lda of over 55 dBA,
Aircraft operations are unlikely to have significant effect in the tuture
unless large multi-engined jets begin operations in the evening and night
hours.
CONCLUSIONS
The noise environment icer lots in the proposed subdivision is currently
47-48 dBA,, well 'below that of an urbanizedarea and Will remain at satisfact-
ory levels unless urban devoloptent encroaches to it boundaries,, or industrial
uses develop in the immediate vicinity,
d?
Albe t J. Be'ck,� Ph,b,
Prinoi.gal Analyst
S v.,a
PFVat
(jt64/6 JS Pub
e
1;.L -;e As se"ment ruldek�nes
;i. `itat'{stalicllCl.C"
Page 1
Worksheet C.
page Not. A.&USamenl Autdotlris-e
,
WROad(4ilty Noise
Roadway Noise
. llst alt •hhliu'' loads Within lcoo (;-s��•l ol'it SAG..
Ad(ablmenis for Autome6l4 Tame .. .
is la
.. `�+�" (V( SSG t�f/ti
t
9 to
5 Avera
tt A l tx
NOM. Aor
Tae AGT Adatstad Oamsr cm
01!It�
Kt„ �
TAOM] Tebte t.
(DNLwo
"Table 3.Autu ADT rWa�ticha'f t) Ai:snwtkln
Road Nc.2
twd2
IjtudescsllKylnlutmallan
Hai�� H Road
Raed'4
HaadNod'---.._.X
G y
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Ill"tige al the load)
C �I .,.
:Aa(ustm*nts Ibr Nsaay7ruckTramG.
a'Itutimstfaho
..
3 Yom_ -.-----
_
17 to
Avmsge Tarr
tr
SDeeo n
,. 22 23 24 25 26 zT
Seed N�ht• Agus".M CJ"1
Tana Tare FarN.al
B.
tY,'.tudhc"tland.
Vat.
Tat5a6 'Tabte't
Ada.
T� Tatae3 - AnT cutt2} Atm.
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upha
i irnPceloslopslgn
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Haad fln. �l
Add._.,... x _.. % -• . - .�.� - ,.�_ ...:.
r
31
Fdtut pfadentInpercert
a� Avr, vpG aiaed {n apt+uph4
- X..._.y-. X --
r
� �. ;ttoznohles _
L.
-
et/
owit;i l
b% Imdvy trucks • uphill
n Hrmvytruc6s dcwnhN
Radd No a
Ada % -x
�''�.kltrau•BVefdQ4 rA1G11:07'�aLtarndbPGS
- stit":inad1utntruo'sIibelts C�eettLwtA>a'F}.
W 7uttama t' les. -
220
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.
b irtbdlumiruck4
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? 10 20 40 60 100 210 400600 1000G 2000 4000
•Ar
4
e
i
r -
September 8, 19921
Mr. Too DiGiOvanni
HeritagePartners
P. 0o Box 3665
Chico, CA 95927-3669
bear Mr. DiGiovannis
OAK HIGHLANDS PUD PRELIMINARY GROUNDWATER SUPPLY ASSESSMENT
In accordance with your letter of August 31
-Prepared this letter regarding the , 1992, w�+ have
vicinity of the Oak Highlands groundwater suPPly in the
for the property include a domesticrWaterwsupplyrfornl6 dwelling units, _ng
We have reviewed all drillers reports for domestic supply We11s
available from the California Department of Water Resources and
Public supply well records from California Water Servic,•t Company
within a one mile radius of the property the p Y,
y to as
availability of groundwater.
Domestic wells along K6efer Road west of the property are 125
220 feet deep, have static water levels of 38 to 200 feet`heloto
grade, and 'have produced 25 to 70 w
gallons per 'minute (gpm).
One --half mile north of the sub `ect
and Cvhasset Highway, Property, ,
g Yr a 155 -foot deep aomec 10 Well with static
'water level of 83 feet below c '
at approkimately the same elevationpasdthe dsub`ee30 ct This well is.
subject Property,
,7A 560 -foot deep public supply well, call Water Service
venueStatiroximateon l is located at Marauder Street and R
.Pp y 1-i/4 miles southwest of the subject
Property. This well produces water at 900
capacity Of greater than 2500 well and has a rated
gte This well has a 16 inch
gstatic Water level of 118 feet.
diameter eosin and �,
Accordingto the tette Couhty Enviro p
the minimum re irements for roan
al Health Department,
on the subject 5 dwetersuppl
property is 5 gpm in the Wintery end dwelling unit
summer. Ord in the
1
4
I
fix'. Tota Dialovanni
septertber s, 2992
Page 2;
Based on
CWSgrin information obta had prom edVi ' t
drillers reports,secoids, .and. assessmentew t�E' �ht�
elsewhere in the Chino foothills, We believe hat there
Performed b
sufficient
groundwater for domestic use ,at ould bei
the subject. property. :
.M&E appreciates this o�'
y
pport34it to asiaist you with this
Pleaie contact me $t (9Z6j 342-6958 if pro sot.
information or if you require an additional'
you have an.
y ques#� rrs regarding this letter.
Very truly yours,..
i METCALP & py
�a
a.
Bill Bei r�Y� is
gmann
Senior Hydrogeclogst Reviewed by;E,V
Ron Lubke,
Techni al specialist �y ,
1.
X14 � r
h�
,y
v41
s,
PsiI
�r
+tip `.'�,.-�`^-•,:.
-` .07
suite coun
LAND DEVELOPMENT DIVISIOIN
DEPARTMENT OF DEVELOPMENT SERVICES
7 COUNTY CENTER DRIVE OROVILLE, CALWORN1A 90905�3397
TELEPHONE. 19161538.72GG
FA`! WO 538-2140
January 1.1, 1993
David and Ruth Manthei RE: AP 47-23-59
c/o Heritage Partner; vesting PUD
426 Broadway, Suite 265
Chico, CA 95928
Dear 14r, and mrs . Manthei i
At the regular meeting of the Butte County Development Review
Committee held on January 11 1993, the committee reviewed the
above referenced Planned Unit Development, As a result of this
meating, the Development Review Committee will recommend the
enUlosed list Of conditions to the Planning Commission.
Should. you have any questions regarding this matter, please contact
this office at 533-7256.
Very truly yours,,
Stuart Edell
Manager,Land bevelopment Division
Department Of Development Services
SE/ds
coEnvironmental Health Department
Planning Division
Heritage Partners, 426 Broadway; Suite 2o5 Chico, CA 95928
_.
Oak Highlands Vesting PUO, AP 47--23--59 and 60 on the east aide of
cohasset ,woad, approx. 1/4 mile north of Ric
Chico. hardson Springs Road.
i
;Land Development Division conditions:
I Submit road and drainage plans to the Department of Public
Corks for approval and install the required facilities:
2 Provide 20 feet radius property line returns at all street
intersections.
Indicate a 55 ft. building setback .line from the centerline
Of Cohasset Road,
4 Street signs shall be provided by the developer at all street
intersections per County requirements.
mit 5 alt
names for each street to the County addressbcoordinatornate for
approval of street names.
5 Construct full street section on interior street to section
shown on tentative map. Recommend 24 ;ft. minimum paved width.
6 Provide monumentation as re
Works in accordance with accept d standa the ds artrient of Public
7 Provide permanent solution for drainage:
s All easements of record to be shown on the final map.
9 Meet requirements of the Butte County Fire Department or other
responsible agency.
10 Street lighting shall' be
Count Y qureirements provided in accordance with .Butte
accepted design criteria, and
recommendations of PG&E
11 Construct a standard left turn lane at the intersection of
access road, and Cohasset Road,
12 Construct standard S-18 public road approach at
intersection Of Cdhasset Road and access road, the
13 Provide 1 ft, no accessstrip on C
ohas t Road .frontage 'with
opening at access road.
se
14 Meet the requirements of the 'utility companies (i. e., PG&E,
Pacific'Teiephone, water, sewer:
15 Pay any delincpaent tastes or current taxes as
required,
15 Developer shall PrOlVide all required traffic safety sig
including stop signs. ns,
I, �
Health Dept. conditionsr
17 Provide community sewage collection treatment and disposal
facilities in compliance with California State Regional, Wator.
Quality Control Board, Code of Butte County, California .health
and Safety Code, and other applicable codes and regulations
governing the design,, construction and
facilities. operation of the
is Provide verification of final wastewater plan approval by the
Regional 'WaterQuali'
ty Control Hoard prior to construct,l.on of
site improvements
19 Provide a legal (government) entity adequate to insure the
operation, maintenance or 'repair of the sewage
treatment and dispL al facilit.ies. As a minimum creationoof
the entity shall:
a. Insure financing of operation, repair and maintenance.
rj
b. Provide ualifi ed individuals and operai-ional procedures
for facility operational, repair and ma-.,.,.enance.
c. Provide adequate resources to comply with all monitoring'
and other Regional Water Quality Control Board: Waste Discharge
requirements.
d.. Provide adequate resources for -facility inspections and
reports for a County Service Area or other, maintenance entity iy
e Provide adequate resources and/or mechanism to insure
adequate funding of a major sewage treatment and disposal
facility replacement or reconstruction of necessary.
f - If a County Service ,Area is 'utilized; provide a Liability
risthekassessment for county of Butte rand County hService of Butte. ,Indemnify
Y
a .r
may occur relative.to the sewage disposal facilities.
Area for claims that
20 Meet mosquito abatemE�t requirements for control of mosquitos
and nuisance insects in the wastewater ponds
21 Comply with all sewage
stadisposal facility constructi011
ndarr'; and health and safety requirements of the code of
Butte County, California State and Federal Law.
22 Provide adequate quantities of domestic water for each parcel
by provision of a community water supply in compliance with
the California Stage Safe Drinking Water Act or bir the
provision of an approved individual well
Parcel site are for each
.
; - g"�nar�me►�t
JAN 05
993
LA orovIll
LAND OF NA-1,111.AL WEALTH A', D BEAUTY
DEPARTMENT OF PUBLIC HEALTH
DIVISION OF ENVIRONMFNTAI HEALTH
THOMAS REID, DIRECTOR
18-8 County Center Drive
Oroville, California 95965
December 31, 1992 Telephone: (916) 538-7282
FAX: (916) 538-2155
A:✓
David anthei
c/o Thomas DGiovann
Heritage Partners
P.O. Box 3669
Chico, CA 95927
RE Oak Highlands PUD - Cohasset Road, Chico - AP# 4?-23-059, 060
Dear Mr. DiGovanni
This department has advised the .Butte CountyDepartment of Development Services, Laird
Development Division that we are prepared to act on the above application.
.Based on. present information, we can recommend approval or conditional approval;
Recommended Conditions for Approval'
1. Provide community sewage collection, treatment and disposal facilities in compliance
with California State Regional Water Quality Control Board, Code of Butte County,
California Health and SafetyCode, and other applicable codes and regulations
governing the design, construction and operation of the facilities.
2i Provide verification of final wastewater plan appAoval by the Regional Water Quality
Control Board prior to construction of site improvements,
3 Provide a legal (government) entity adequate to insure the operation,
maintenance. or
repair of the sewage collection, treatment and disposal facilities. As a mirdmu n
creation of the entity shall;
a. Insure financing of operation, repair and maintenance.
b, repde air and maintenance, uatified individuals and operational procedures for facility operational;
C: Provide adequate resource to comply with all monitoring and other Regional
Water Quality Control Board Waste Discharge requirements.
�� A CLEAN INDOOR AIR ENVIRONMENT FOR A HEALTHIER TOMORROW
David Manthei
December 8, 1992
Page 2
d. Provide adequate resources for facility
Service Area or other maintenance e tinspections and reports for a County
e. :Provide adequate resources and/or mechanism to insure adequate funding ofa
nrxessary,
major sewage treatment and disposal facility to
or reconstruction if
Ifa
Sec
f by the Countyoe'Area is utilized
, provide a liability risk assessment for review .
Butte. Indemnify the Coun
Area for claims that may occur _relative to the seWageOf ud Butte
facilService
ities.
in the wastewater 4. Meet uito y�-�onds atet requirements for control of mosquitos id nuisance insects
S. Comply with all sewage disposal facility construction standards
and health and
requirements of the Code of Butte County, California State and Federal Law. safety
6. community pwater su uantities of domestic water for each parcel by provision of a
Act or by the provis ny i an approved individual well StRte Safe Drinking c Water
area for each parcel.
If you have any questions regarding this letter, Please .contact the Chico Office at the above
listed address or telephone number between 8:00- 9 OOa.m. Weekdays.
Verytruly y
y .yours,
Thomas Reid, Director.
Division of Environmental health
TRlmlf
cc, NorthStar -Engineering
Planning
Public Works
Ron Dykstray RWQCB
August 21, 1992
r. Tom DiPiovanni
1 LRITAGE PARTNERS
P,,0. Box 3659
. Chico, CA. 95927
a Subject: Water supply for the Oak Highlands Project
Dear Tom,
At your request we investigated the requirements and
Alternatives for supplying water to the Oak Highlands project. We
requirementsa for sm 13 watE Environmental Health requirements and the
reviewed the Cottnt. Enviro
systems contained in Title 22 of the
State Health and safety code. Several alternatives exist for
providing water supply to this project. We looked at three of the
most feasible and have included them in this report. The cost
' tr estuuates are very preliminary in nature, especially the well
construction cost. We used recent experience on a project within
T two miles of the project site, however drilling and groundwater
a, conditions could vary;
i The least cost alternative is to
provide fire protection only.
The additional relative cost however to provide both fire and
domestic water is estimated to be on the order of $4200 per lot
which is comparable to the cost of a single domestic well. The
combined system of fire and domestic may be a positive marketing
and sales item. -
I have enclosed photos of a system similar to Alternative III.
The site in the photos clearly could use some maintenance or
landscaping hovrever the basic components are readily visible.
Please feel free to call me if you have any questions or
comments or would like to review: You input and critique are
valuable to me
Very Truly Yours,
NORTHR'TAR RF Jr.` ?JV.Pti7TMrI_ �,
COUNTY REOUIRE24ENT5
16 Lots; 0.77 Acres to 2.36 Acres
if preagcured su].ply (domestic and fire) is proposed;
Per County Chart 1, 3.6 Lois Q=180 g.p.m. 1/3
source, '2/3 storages
2 hrs min.imimm flow required. Minimum well requirement = 60 g.p.m.
;Stora e Required. quixed - 12.0 g.p.m. x120 min,,.
= 14,,400 ;gallons.
Fere Flow Requirement
hrs. x 500 g.p.m. = 120 x 500 = 60,000 gal.
+ average day demand.
Deoign system for average: day demand. Fire
flows and 'maximum day
damand to be supplied from storage:
Minimum supply and storage requirements
to meet all County-
requirements;,
Minimum well supply: 60 g.p.m.
Storage requirements: 60,000 gal.
TITLE 22 RECUIREMENTS•
For systems with fewer than 200 connections
,Source Requirement = Maximum day demand
Chart 2 = 40
40 g.p.n.< 60 g.p.m. (County)
Storage Requirement = 3'5,000 gallons.
Since Title 22 requirements are less than
County requirements;
County requirements control.
Supply = 60 g.p.m,
Storage = 60,000 gallons
$4ATER SYSTEM ALTERNATIVES
T. Fire Supply 0 ly
A small well would be drilled to provide a source of water for a
60,000 gallon storage tank. The storage tank would be kept full at
all times. A pressure system capable: of providing 500 g.p.m• would
be required. A standby generator may be .required. A distribution
oystem with 6" (minimum) mains and fire hydrants is required. The -
operations and maintenance could be provided by a County Service
,
Area (C.S.A.) or possibly Homeowners Association. No domestic
water world b. provided, This means that the individual homeowners
would be responsible for drilling 'their own well.
TI. Domestic and Fire: One Well_ nlus Storacre
A well would be ,provided that meets the average dt. y do°nand of 60
.. g.p.m. minimum. A., storage tank with 60,000 gallon capacity would
provide emergency and fire storage. A pressure system with a
backup generator would provide pressure for both domestic and fire
flows . !Typically 2 or 3 pumps aace used in the pressure system;
.one or tiuo to provide domestic flows (60 g.p.m.) and one to meet
fire flow (500 g.p.m.) A large 3,000 - 5,000 pressure tank or
,several smaller Hydrop.xteumati.c tanks are used to maintain pressure
in the system.
III._ Domestic and Fire: Two Wells
With this system, typically no static storage is provided and the
well pumps are used to pressurize the system. One well and pump
are provided for domestic flows (60 g.p.m.) and one larger well and
pump provide fire flows (500 9 -P.M.) . Each well can also be used
when ,repairs (ie. pump replacement) i.s being done on the other.
The 'system is, of course, interconnected. Standby power, generator
is provided.
.4
.. SYSTEMS COMPARISON
System I
vant7res Lower initial cosi: due to smaller well. and pump. Lola
energy cost. No domestic water requirements. Simpler regal
entity.
10 sadvantages -No domestic supply, therefore, each homeowner needs
individual well. Distribution system costs are nearly the same if
-� hydrants are provided. Requires storage tank and pressure system._
'. TEM 'I
X vantaQese Provided fire and .domestic supply. Only one well to
drill (60 g.p;.m. )
DisadvantagesRequires storage tank (aesthetics) and 'pressure
;system. May require standby generator'. Requires legal, entity;
C.S.A. or Mutual Water Company.
;SYSTEM III.
Advantages: Provides 'fire and domestic supply. Does not require
a storage tank, nor does it require additional pumps to pressure
ystem Second well in place in case of problems with primary one
'Disadvantages: Requires second, larger (deeper?) well with larger.
pump. Standby chargesfor
large pump (P.G. & E.) More costly in
areas where water supply is questionable. Requires pressure
tank(s) ,and standby generator Requires legal, entity like System
2I.
,POSSIBLE OPERATING ENTITIES
SYSTEM T.
HOMEOWNERS ASSOCIATION
Homeowners Association res onsible for
p paying energy costs,
replacemr,'�:t and reserve fund, occasional. maintenance. County
Service Area most likely would be required to oversee homeowners
Association to assure operation and Maintenance are accomplished,
testing is done as requirod
f
12UANTITY ESTIMATE
SYSTEM I.
I*
Well 200 feet deep*
1/2 hp pump
Controls
2.
60,000 Gallon Storage tank
3.
611 diameter Main: 300, + 360, + 420r
1080 1.f.
'Fire Hydrants: 2 ea
5
Misc. Hlowoffs, Air Relief Valves, Gate Valves.
6
Pressure System
i
Small building enclosure for pressure
system.
B.
Trench excavation: 1000 l.f.
*
level
Possibly use domestic well from lot, backflow preventer, liquid
gauge to verify tank is full.
SYSTEM iI'.
.,
Well 400 feet deep, 811 diameter _
Pump
Controls
2.
60,000 Gallon Storage Tank..
3.
Booster Pump System
a. Shall Ry'dro Tanks:
b. One, 3000 Gallon Tank:
4.
Building:
5.
5tanaua* Generatok,-.
6
diameter t ai n. 1090,
3" diameter. Maip 300'
/.
Single Service
Double Service G
8 .
Trench oxdavatior 1.380 1. f
S.
disc tlowoffs,, Air relief Valves, Gate
Vftives.
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13.00 FIRE STANDARDS
13.,01 Appl icat,ion -,
Tho type and size of to project dictates the fire department requirements for
viater,. The following chart will lead
_ poc l f t c requirement:
the planner/Interested party to the
M!L`TTIr"t
REOUIREA�Eh7
FAMILY
RES
PROPOSED CAERCIAL.
USE
REQUIREMENT 3'
IW JSTRIAL
4 OR REQUIREMENT 5
LESS
WITHIN 51NG1E=
1000 FT. FAMILY5
LOT 2.99 ACRES
512E
OF OR REQUIREMENT 3
RES,
OR LESS
COTS t:AEATEO MIRE
'F'FtESSU,tIZEL)
,WATER W ?LY
3 `MS RECUtREWW 1
OR JURE
0E THAN MITI-FMILYAJhf3EA OF
s
r 1000 FT.14LOTSt REQUIREMENT 4
RES: CRCIAL
LOTS CItEATEO
I M)IISTR I,il.
..
IO PLUS REQUIREMENT 3
PROPOSED
USE
REQUIREMENT 1
LESS
SINGLE-
LOT
2.99 ACRES 1d A.6iR Of
FAIdIIY-RES,
SIZE OR LESS� LOTS CREATED 5-29
REGtIIREMEKf 2
S 30 OR REQUIREMENT a f
OE
REOUIREJOff I
*' or Units
A pressurized Vater
foraged or private water
system is deflned as an
service y Public, mutual locally
lurlsdlctlon
having water capable of
adequately supplyl,ng fire hytl"rants'..
113,,-01 —1 h�I eqU I remen Class 1
i
`rept for those areas deslgnatea
bndex map' a pressurized water'su
as ex-trenie hazards on the.. hazard se4erlty
I a
KO ever, 2,500 gal Ions of water
musty be
�parcel ill tcreatetl iced.
.'per,
�1 be determined
aividedafOr eiachOn
The
(built Z
b the.,.,fIre
i,rt lleUcOf bearing the coast
to S--2 standards)
department In
� .con.,
of InstalI'Ing a static Walter supply systeftiopthe
46
j
U'
oVe IO'Por may pay Into the fire department WATER TEN09 FUND. The amount paid
r
j based on the number of parcels created. Calculated at a rate of $260 per
-Tj parcel
:%kbdlv(sions In those areas designated as extreme hazard on the fire hazard
lev.erlty Index where the lot site is less than 10 acres will require a
pressurized community water system.
IZ.01-2 Requirement Class 2
4 pressurized water system with adequate numbers of hydrants is preferred, but
if this is not feasible, the following options Wit satisfy the fire department
r,equl rement for water.
a. Water storage tanks with a capacity of 10,000 gal ions or more,
equ I pped w I t'h d rect a I I `weather access or f i re department connection
(S-29).
b. In ground swimming pools equipped with a drafting connection or
drafting access, or
C. A dry standplpe system plumbed to a reliable Water source. Such
standpipe system will not exceed 1,000 feet In length.
=here must be as least 10,000 gallons of water available and strategl,cally
located for each 1.0 dwellings, or portions thereof (Example: 11 dwelIIngs Would
tI re two separated Provisions
must emade to ensure that
soredIs alwaysavalIable and accessib eor use under allweather conditions, ndItions,
13.01-31Requirement Class 3
A pressurized community water system Is required,, See the general raqulrement
section for the hydrant spacing, hydrant site and fire flow requirements. The
specific location of the fire hydrants Will be made by the fire department In
consultttlon with the developer,
I� t3.0i-4 Requirement Class 4
ti Water for f Ire protection Is regUl.red. the preferable system is a hydrant system
capable of meeting the f"Ire flow requirements, if this Is not feasible, a system
Involving Independent pumps; static water storage and dry standpipes may be
substituted', Such a system is subject to the approval of the flee'department,
The avallavle WZ'tar flaw from such a system must meet the gr.nera
I flow
requirement. The Minimum volume of Water In storage must equal the fire flow
for the type of project times 20 minUtes. Provisions must be made to ensure the
a system provided is maintained to its design capacity.
13:016 Reguiremen'. Class 5:
w
PressUelzed Nater for fire protection is avaltable within 1,000 feet of the
created oi�eddis. In 'I leu of bearing the cost of lnstal'iing a flee hydrant($)
the dove l r ep r. may pay into the fire department hydrant fund 'Thri amount paid
4
Is based on the length of the svredt frontage of the created parcels. The amount
paid Is established at $1.72 per frontage foot,
ullctlon 13.02 Tlminq,,rid Pinanclal R aPonslbllltyi
)tonic requirements must be met prior to construction of any buildingon the
croA ted parcels. The cond;tlon need not be met prior to the filing of the final
man, If this Is the case, the deveboper must show proof of a performance bond
or other financial arrangement to cover the cost of these requirements.
13.03 General Requirements:
—
13.03-1 Fire flow requirements for other than recreational vehicle or mobile
home parks:
� 0) r[q w
F� �S i � H 4 (1) W 0 4-)
3� �w �� 3r 5.1 �
Land Use. MtnlmUm Flow GPM
Ai Lot` density, of one :or less
single—family 'residential
unit per acre. 500 NA NA NA 4" 600`
B, Lot density more than one
andless than three single—
family residential Units
Per acre. 750 NA NA NA 41' 500`
C, Lot density of three or more
single—famity residentla'
Units per, arse, 1,000 NA' NA NA W1 600,
6 Duplex residential units,
neighborhood buslness of
one story,. 1,500 11250 1,000 750 6" 5000`
E Mutipie resldentlal con-
dam t n i ums ), one and ttvo
stories, tight commercial
or ilght industrial 24000 1,500 1,250 1,000 15 300,
F:, Multiple 'residential (con—
dominlums), three stories
car higher, he4vy commercial
di, heavy 'Industrial 2,560 2,000 1,500 1,250 6" 300,
11 Local water agency requlrem6nts for hydrants may be more restrictive,
48
h
�
I
VOWMI: WHEN 0 = too � FLAT RATE
WATEir� SYSTEMS
.,�--
NEtDED
STORAGE
-
100,000
MAXIMUM
MONTHLY? AIR
AVERAGE
TEMPE'I'Z1'�TU�E
80 F (i"•i"" C)& HIGHER
101000,000
_ .
_
700 F C,Itl C)
60' F( '
50° F ( 10* t,) Ek LOWE11
I5,000,000
10,000
ti.]
,.
w
il?
1,000,000
r1
500,000
1,000
�
Q
U
7
100,000
�
50,000
'
100
10,000
5j000
10
2;000
,,
10.0 500 WOO
to 000
i
2 3 45 10 ,�O
coNNECT� N
SERV1CF.
{UKT'rlt ��5a'r:F• IlrntlTlua•Ir.NTS
+IZit er >z:4jstelli-'. proposed' for subdivisions .shall meet the minimum Flows as follows;'
ttn^1at3:ria of Supply. (a) llie quantity of water available from all of the water sources and distribution storage reservoirs
s1 p9l lk.Is sufficient to supply adequately, detlondably, :Intl safely the total requirements of all customers under mlaximrun demand
co,i"..131iri o Maximum customer requirement may be determined from adequately suT)por'ted and documented system record or by chart
The :fl.i%v requirement indicated on Chart 1 is for average demands not including; fire flow. This flow shall he appropriately
,>,>;t-;7,rall v,onted; as required by the department, to take into consideration such factors as climate, community types, kinds of tits-'
t�sPer5,, ;nhd past experience, This flow shall he av,ailrible continuously for at least two hours; one third must be provided
fru;; xPa water source and the remainder may be provided from distribution storage,
(!! >} ik mister meter, or other suitable mr asurinl; device, shnll be pror+itled for each source of watter, supply.
r Y 2 3 A 5 -6-7- fliir 2 3 A 5 C, fl9'1 7 3 4 5 t;
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ry i
1laltrr Supply Rcqultements Chart
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i
BOTANI'CA14 SURVEY OF 80 ACRES, COHASSET ROAD, CHICO CA
Prepared by: Mary E. Meyer, Botanical Consultant
4095 Freedom Road
Oeoville CA 95965
(916)533-5449
1�repared for: HERITAQ2 PARTNERS,-P'lannin,g and Development
Mr. Stepheb Honeycutt
426 6roadway, Suite 305
Chico CA 95928
PROJECT DESCRIPTION
The client proposes to cohs'truct a residential subdivision on
approximately 80 acres of undeveloped grazing land. The property
is located about 4/10 of a mile SE of the junction cif Cohasset and
Keefer Roads. The t-;estern boundary abuts Cohasset Road, and the
southern boundary ec.ds just north of a powerline running NW by SE,
LEGAL DESCRIPTION
Township 23 N , Range 1 E , SW 1/4 of SW 1/4 of section 23
j
NW 1/4 of NW 1/4 of section 26
i
SETTING
The property consists of a low relief ridge and valley at the foot
of Coheetset Ridge at the base,of the Sierra Nevada, The site is
underlain by volcanic rook with very thin soils on the tops of ),he
low, ridges. Upland sites are dominated, by mima topography)
consisting of scattered clay lenses "inter,�persed with ►uplifted
volcanic rock. Islands of boulder-sized volcanic rock are
scattered throughout the northern upland area. A sharp rim of
volcanic boulders separatesthe northern Upland from the
valley/lowland area, and marks the eastern boundai+y. Elevations
range from �30o to 450 feet. The valley faces to the 'West. Slopes
are generally less than 20%, eXcept along the steep volcanic rim.
Numerous ephemeral/ihtermittent drainages converge in the central
valley/l'owland area. The property drains from east to ,west. An
artifical stockpond i:aptures some of the seasonal rolloff; and
appears to contain water at least through June. ,An Overflow`
channel directs surplus runoff around the south end of the stock
pond* One i'ntermitteht drainage West of the stockpond cohtaint a,
vernal pool about 16 feet long and 20 feet Wide.. Overflow from
,1
this draina9e enters the :drainage ditch along Cohasset Road. The
overflovi channel proceeds south and west of the stock pond, and
spreads out into a low clay f1at that appears to support saturated
soils during the rainy season.
Vegetation consists of Wildflower Fields and Non -Native Gr:jssland
SF with scattered Blue Oak Woodland. Upland sites Support
Woodland with a canopy closure from 1)-60%. Blue oak
Woodland Occupies the steeper areas along the easternrp pine -oak
volcanic rim, with a Nanoportior. and
vegetationcanopyWetland occupy the pools, ephemeral drainages an clay
flats. (Nomenclature taken from Tolland, ;.986);
VEGETATION MAP
An erYarged section of a U.S.G.S. topographic map is attached,
showing re't ief and general vegatation types in the
Project
The locations and extOht of ephermeral draina es rn
ve ooarea.
g
Clay flats are approximate. A color aerial photograph
pools, and
used to more accurately delineate onsite wetlands. �oyraph could be
SURVE' .MC— HOUOLOG`l
The site was examined on two occasions, June Z and June 14, 1991.
Ah intensive, systematic examinati-on
was condu6ted, using a
rtransect method for tho Wildflower Field and Grassland
areas, individual oaks and :groups of Oaksand forested areas
were examined as well.. All drainages and wetlands we
systematically surveyed, were
Surveys Were conducted about, six weeks after the primar spring Y prih9
blooming period. Therefore, surveys for early blooming species
were not conclusive. Potential habitat these species was
identified. A follow -Up survey in early March an early April of
next year will be required, unless avoidance of
Plant viabitat can be ehcorporatod into the project ds�gni.al rare
Field surveys Were floristic in stature. Al s
peci-es encountered
Weide identified to thy± eXtent necessary to determihe whether they
were rare or endangered'.
OTENUAL RARE PLAN` S
Table I shows la list of rare lasts that dould potentially occur
in the habitats and last commuhities present onsite and also
�hdicates the plant's status on various rare plant lists, Thke
majority of potential :species occur on the California Native plan
Society List 4- Plants of Limited Distribution- A Watch List (Smith
and Berg 1988) Thes species are uhCOMMoh ohough that their
status should be monitored and vulnerability' to threat8 a
ppeaet to
be low at this time, Under the California Environmental Quality
Act<, a species hot included on the state list shall nevertheless
be considered endangered if the spaces can be shown to meet the
t
�!I I
criteria for listing. CLAPS list 1A 1'B and 2
Plants are generally
recognized as meeting these cri'ter%a,
Table T. List of rare and endangered plants expected to occur in
t;.he project area. Includes presence or, absence onsite and
references to ONP8, State or Federal listing status,
Plant Name Present CNPS State Federal
Astragalus Pauperculus 4 / C3c
Balsamorhi7a rnacrole is v a r,nL, 3
Calycadenia OPPositifolia C
Fritellaria Pluriflora is C2
Hibiscus caaifornicus 18 / 02
Juncus bufonius var. congdon'i'i 4
.-uncus leios ermus var. 1„ 113 C2
Limnanthes flocossa ssp. cal:ifornca 1B F Proposed
Limnanthes f ocossa ssp. f 3
Mimulus lauc,escens d
Navarretia heterandra q,
�. Paronych.ia allarti1 16
Polygonum bi dlvel l i i - _ 4 / _ C3c
Quercus 1 obata3
Rhyncosnoraca.l i forn_i ca 1.9 / C2
Sidalcea robusta 18 C2
CLAPS List 1SPlants rare threatened or endangered in
Califorhia
CNPS List I w Plants about which we need more Viformatioh
CNPS List 4 = Plants of LimitedDistribution
State List E _ Endangered
Federal' Proposed= Proposed rule to list as endangered.
Federal List 02_- nata fnuufficient to support listing
Ing
Federal Li;t C3c= Too widespread or not threatened
i
SURVEY.RESULTS
The Tehema N.avarretia (Nawar.retia heterandra) was located along the
seasonally damp margins of ephemeral drainages; vernal pools and
clay flats throughout the 10WIAhd area. Occasional patches were
also found in low, draihage areas leading off the .,ou'therh upland.
Several hundred plants were 068erved. Occupied habitat is shown on
the topographic map ,as areasdjaceni: to nipped wetlands.
The 76w'iand areAj ihtlading epmer;4l ,
.her
dran,�ges, swales, vernal
p0018 and clay fla 8 contain suitablo habitat for 'three species,
the adobe lily (Friteliaria pluriflora ), wooly meadowfoam
(Limnanthes flocossa Ssp f10rossa ) and Butte County meadoWfoam
(Limnanthes flocossa ssp, californica ). Both meadowfoams and the
adobe lily bloom early in the spring, generally between late
February through the end of March. Livestock grazing and the late
survey season results in poor survey conditions for these species.
The adobe lily generally is dessicat..ed and broken up by early May.
Similarly, both meadowfoam species set seed by early April, and
their presence in wetlands favored [)y livestock generally resu1ta
in them being broken up and trampled by the end of May.
The iproject area generally lies within a transitional area for the
two meadowfoam species. The northern most known population of the
endangered Butte County Meadowfoam occurs l e;;s than 112 mile to the
south. The project area is outside of the Chico sphere of
influence, surveyed by Jeff Dole in 1988 for the City of Chico.
Therefore, the ,presence of the endangered Butte County Meadowfoam
cannot be ruled out, as suitable habitat is present onsite. The
wooly meadowfoam is known from adjacent areas, including properties
west of Cohasset along Keefer Road. Both species occur on the
proposed Rancho Arroyo project, 2 miles SE of the project area.
r
Wetlands, which are consideredSignficant Natural Communities
dominate the central lowland area. Rocky ephemeral drainages carry
surface runoff during the Winter months, converging in the lowland
area: The two main areas draining from east to `West etre ponded by
an artifical pond and berm. Livestock trampling of the-stockpond
margins have left the drying margins almost entirely free of
Vegetation, exdept for, weedy grasses that had not yet developed to
an identifiable condition. Runoff from the surrounding uplands
drains down to the lowland, leaving clay flats which :are dominated
by obligate and facultative wetland toocies such as coyote thistle
(Ervn , um vase i) , White n� tKrreti' a (Nava rtes i a l eucocebha l a )
stipitate popcorn flower Pl'�
cicboth s stitaitatus) hairgrass
(Deschampsla danthonioides) ana wooly marbles (Psi_locarphus
beeyissimus and P. tenel itis }. Vernal pools "-h--I ephemeral
drainages contain samilar .species, but also include speedwell
(Veronica Pereari na ) , gol df i e'i ds (�ast,htenia fremonti i ) and
Downingia, The topographic map, attached, showns the approximate
location of wetlands in the project area.
SURVEY IDISCUSSION
Oak Wotidland and Digger Pyne -Oak Woodland appear to contain
suitable habitat for the rare Butte County Checkermallow, but the
species Was hot observed, This finding is consistent with the
known range of the species- the northernmost population is found
in the L4i;g Chico Creek Canyon of Upper Bidwell Park about five
miles away.
Followup Surveys for the three early blooming rare plants should
be performed neXt March and Aori 1 Livestock grazing axnd Watering
in the lowland Area has
probably reduced the diversity of species
within wetland areas:. The, stockpond encourages livestock to
,congregate in the lowland and associated wetland habitats.
POTENTIAL IMPACTS
The client is proposing to divide the eighty acre parcel into
parcels for residential use, and the project lies within the
,CoUnty of Butte.
The change from winter livestock g'razin
have a profound affect upon 9 to residential use will
p the project area, soils, Vegetation and
wetlands. Direct and indirect impacts to rare plants, Wildlflower
Fields, wetlands, and oak woodlands are likely to occur from
construction' and subsequent post-project activities. careful
planning and mi'ttigation measures can reduce some of the impacts.
Trees onsite could be impacted by road and mousing construction and
subsequent landscaping and watering Firewood gathering could
deplete trees over time. Summer irrigation can result in loss of,
native vegetation not adapted to summer watering. irrigation and
.subsequent runoff into ephermeral drainages may change the na;,ure
of the vegetation, encouraging more weedy species which wo�xld
reduce the 'habitat quality for native wetland vegetation. These
'n changes would be the result of alterations in the amount, timio.9
and seasonality ,of runoff.
+ us surfaces} and: drainage
Road construction increases in impervio
alterations may impact downslope wetlands, causing increased peak
storm velocities during storm events and changes in runoff patterns'
Onsite.
Faze l breaks to protect t1,1e development from grassland fires can
cause accelerated erosion and direct impacts to woody vegetation
and. wetlands.
F'oilowing occupancy, additional impacts could include physical'
trampling of 'vegetation by occupants, P'',ets, bicycles and vehicles.
Exotic vegetation introduced for landscaping could spread; although
poor soils reduce tho liklihood of this event. The change from
winter cattle grazing to year .round pasture for horses; goats;
�I etc..,, could profoundly alter pastured areas, and it is likely that
vegetation in pastures will be largely eliminated or converted to
norl-palatable weeds: increasednutrients from introduced feed for
grazing animals could reduce water quality in onsite drainages and
ponds.
PtCOMMENDFd MiTIGATZON` MEASURES
Ngyar_rettia eterandra. The
,iikel to population of 1'ehema Navarretia is
y persist if�lowlying Wetlands remain largely unaltered;
Because this is a List 4 specles, spOCific mitigation measures are
5
not .required:.. However, the cumulative effect f these other
projects may result in the need to re-evaluate rarity andnthre,ats
'to the species.
etlands : Ephemeral drainages, the stock pond, swales, vernal
Pools and clay flats should be fully protected from direct and
indirect project impacts. If avoidance )f the lowland area is
incorporated into project not
j _ ct design , then a wetland delineation should
be performed to more adequately assess the extent and nature of
Wetlands. The California Departfie,nt of Fish and Game has adopted
a No-Net -Loss of wetlands, and any '
adequate rni t7 gati on wool �� be considered
impacts to wetlands without
Corp of Engineers has ,
would be requit-ed to fll �or�otherwhsritygantl�a sect' ion e404spermm
larger; in size. a alter wetlands one acre or
Impacts i:o wetlands withinthe lowlying area could be largel
avoided by placing this area in an open space easement; with
restricted use only Winter cattle
grazing, With light
utilization, should be a11oWad within the wetland areas. .Because.
the lowland area is ;mall in extent, Winter grazing might ,9.
g g
difficult to manage.
developed which directed not f naaa�ndo the centra l construction could be
drainage connec�ed to this Cohasset Road roadside ditchWland, with
disturbance is restricted to the 'i»w relief, u If ground
grading Would also help reduce , ' Aland areas, impacts
to Wetlands should be minimal. Li`m'itations �7n impervious slarfaces
and
impacts tc Wetlands
tential Rare Plant Habitat: Avoidance of impacts to wetlands
discussed above would provide
adobe lily and wooly meadowfoam,a should subsequent
on
for both the
find these species ohs i te: Avoidance of Wetland Spring
surveys
would
probably preclude the need for fol lo;
g, a adobe lily is negative impacted beat spring.
However, because
9razin it is recommended that winter livestock
grazing tobe
prohibited unless subsequent survey
present; s show the species is not
It is possible that the clieht coi.ila
tProceed With the project prior
o folloWup surveys
next spring for the endangered Butte County
Meadowfoam, but this Would require that the lowlyina areas be
treated as if they support the species , The Uri i t g of og i st J "i m
MhtSnowden (.Region 2 office of thi� !)apartment of Fish and Game)
g Ulted as to how he state would recommend Proceeding.
,i shouldbe
measures to avail
impacta to wetands may e suffpcient,
but _ in the citif3 of a verified state listed endangered s ec es
additional measures may be required, Because the But Count;
Meadowfoam is Proposed for l i sti h
Act, informal consultation With the Ijhde the Endangered Species
,mento office of the U . s
Fish and Wildlife Service would also be
necessa;•y,
oaks Pines Woodlat�tls aMd Generr3l' vegatatior It is important
'� S
i
I
' _
to understand
that the shallow, thin soils onsite underla.n by
volcanic rock; will be extremely difficult
to revegetate once
surface soil and plants are removed. Traditional landscaping Will
be very difficult to establ i
sl•r. Most of the trees onsite,
articular, in the upland and wooded
particularly p lowland
areas, occupy limited
areas where soils are deep enough to allow them to gain a foothold,
and are several hundred years old,
Therefore, it is recommended that native vegetation be preserved
onsite and incorporated into landscaping
schemes and project
design This can help reduce the noted to introduce exotic
species
and will help reduce water consumption; because natives require
little if any
summer watering.
Consider incorporating the following; measures ;into plans for the
development;
�'
-protect trees and shrubs from �dirert and indirect " �'
impacts,
- delimit areas for construction related pat -king, otherwic�r%
vehicles will tend, to park under the shad,
anc' rjs trees, damaging roots
Where development menu is to occur near existing trees and shrubs,
protect an area beneath the drip line from
any changes ingrad..e ,
filling, runo. f or watering. Utilize bark chips or small stone
-Tess than 3" deep beneath trees and ,hrubs within managed'
landscapes if
grasses are undesirable
- uti1'le temporary feuding, or conspicuous flagging and strong
stakes, ro protect trees and shrubs from
Constriction impacts, and
monitor compliance,
-maihtain dead` and or, downed trees r~nd shrubs in open space
areas, as they provide habitat for '_ . ,n
'wi lcil
ife species, including
Cavity nesti nd predatory birds such as ow1 s and insect eaters such
as woodpeckers and bats:
SP_EGIES IDENTIFIED
A list of plant, species faun& onsite is appended ti'S .this report,
ACUITIONAL SURVt:-Y NEEDS
As previously mentioned, followup surveys for three ing
,r
are Plants should be conducted next March
and Aprilarl Unless 'the
the
Potential habitat is treated through-ivdidance ($'ee discussion in
the previous sections ):
E?EFEf�ENCES CUED;
r
s
�1
` piss �11
Holland, R. F. 1986,
Preliminary Descriptions of the Terrestrial
Department of Fish
Natural al 'Communities
of California, California
and Game, unpublished manuscript.
Smith, J.P. and K.
Plants of
BCrg, 1988, Inventory of Rare and'Endangered
California. California Native Plant Society
Vascular
Special Publication
01 (4th ed).
4