HomeMy WebLinkAboutEngineer's OWTS Design ReportI}TOUNT¡IIN CROSS
ENGINEERING" [NC.
Civil and Env¡ronmental Consulting and Dasign
September 28,2023
Dan and Shonna Scott
0080 North Meadow Drive
Rifle, CO 81650
RE: O\ilTS Repair,0080 N. Meadow Dr., Garfield County' CO -OWTS Report
Dear Dan & Shonna:
The purpose of this correspondence is to inform you about the replacement onsite wastewater
treatment system (OWTS) designed for the failing one of your Residence.
The project is located in Garfield County, between Silt and Rifle at 0080 North Meadow Drive.
Interior plumbing will remain the same and drain by gravity to the OWTS. The residence is served
by an existing water system. The OWTS is not within a 1O0-year flood plain boundary. There are
practical constraints thatyou should be aware of when considering the proper design, construction,
and operation.
Subsurface
The soil was assumed to be Type 3 soils with an LTAR value approximated as 0.35 gallons per
day per square foot (GPD/sq.ft.). This is based on previous percolation test results on file at
Garfield County Environmental Health Department. To verif that this assumption is correct, two
profile holes will need to be excavated and an inspection performed to veriff this assumption and
that no bedrock or high groundwater table is within an 8' depth of the leaching area. The
Contractor will need excavate these holes in the approximate locations shown on the plans prior
to beginning construction. Coordinate with this office for an inspection of the profile holes to
veriff soil type. Changes to the design may be warcanted based on these results.
Desisn Calculations
The residence has 3 bedrooms and using Garfield Counfy Table 6-1 for a 4-bedroom residence,
this yields 450 gallons per day (GPD) total. The design calculations for sizing of the septic system
and the leach field follow:
o Scott Residence: 3 bedrooms:450 GPD
o Based on soil evaluation and percolation tests results, LTAR: 0.35 GPD/sq.ft.
o Minimum absorption aÍea:450 GPD / 0.35 : I,286 sq.ft.
o Required septic tank volume: 1,000 gallons per Garfield County Table 9-1. Although, a
three-compartment tank of 1,250 may be used instead, depending on availability.
o Dosing frequency : 4 doses per day; dose volume: 450 GPD /4 doses : 173 gal./dose
o Orenco Siphon Model #310 should be used to draw down liquid 10" in the dosing area of
the three-compartment septic tank.
826%Grand Avenue, Glenwood Springs, CO 81601
P: 970.945.5544 F; 970.945.5558 www.mountaincross-eng.com
Sçræëøidr'æe
September,2023
Page2 of3
The component manufacturers are tvptcal for ihç arca, Älternatlvos may be constdøed by
contacting this office. Construction must be in accordance with the specifïcations of Garfield
Çounty EnvironmenJal Health= the OV/TS permit ard úis de'eiga.
Topsoil should be placed over the OWTS and planted with native grasses, No large vegetation
ans!¡+-r ptrants with taproots shor-rld be planted over the absorption area nor grasse€ tha{ req+ire
excessive irrigation. Calculæions ¡ne affashed.
Sètb&eks
The location for the septic and dosing tanks are limited by setback requirements per Garfield
County and the State of Colorado. These include:
o 50' FROM WELL
r 10' FROM WATER SUPPLY LINE
o 5' FROM BUILDING WITH BASEMENT
o 10' FROM PROPERTY LINE
o 10' FROM LINED POND, DITCH, OR STREAM
o 50' FROM WATER BODY
o 10' FROM CREST OF BANK
o 5, FROM LEACH FIELD
The leach fìeld setback requirements are:
r 100' FROM WELL
t 25' FROM WATER SUPPLY LINE
o 20, FROM BUILDING WITH BASEMENT
o 10' FROM PROPERTY LINE
o 10' FROM LINED POND, DITCH, OR STREAM
. 50' FROM WATER BODY
c 25'FROM CREST OF BANK
o 5' FROM SEPTIC TANK
The setback requirements deal primarily with buildings and potential contamination from the
septic tank, dosing tank, and leach field to either culinary water or surface water. These setbacks
have been included on the plans for reference.
Two rows of the leaching area will be within the25' setback from the crest of the bank. The code
allows this setback to be less if a 30-mil PVC liner is used to direct flows downward. This liner
has been shown on the plans lining the trenches within the25'.
Operation Information and Maintenance
The Owner will need to be responsible for the operation and management of the OWTS. Geo-
fabrics or plastics should not be used over the absorption area. No heavy equipment, parking of
machinery, or materials should be placed on the absorption area. Livestock should not graze on
the absorption area. Plumbing fixtures should be checked to ensure that no additional water is
Mountain Cross Engineering. lnc.
Gþll and Envlronnrental Conauttlng and Dealgn
826y"Grand Aventte, Glenwood Springs, CO 8160't
P: 970.945.5 544 F : 970.945.5558 www.mountaincross-eng.com
Scott Residence
Septembe:;2023
Page 3 of3
being discharged to O'$/TS; for example, running toilets ot leaky faucets can discharge hundreds
of gallons of water a day and harm the absorpion area'
Garbage disposal use should be minimized, and non-biodegradable matedals should not be placed
into the OV/TS. Grease should not be placed in drains and grease tmps should be installed
upstream of the septic tank but downstream fi'om any kitchen. Loading from a water softener
should not be discharged into the OWTS. No hazardous wastes should be directed into the O\MTS.
The OWTS is engineered for domestic waste only.
The Owner will likely need to conh'act with a septic system cleaner to clean the septic tank every
two years, ol as needed gauged by measutement of solids in the tank. The standards of
performancs for the sepic system cleaner are recoiltmended to be the following, at a minimurn:
1. The Systems Cleaner shall be licensed.
2. The Systems Cleaner, when cleaning a septic tank, shall lemovs the liquid, sludge, and
scum) leaving no mole than three (3) inches depth of sewage in a septic tank.
3.. The Systems Cleaner shall maintain his equipment so as to ensure that no spillage of
se\ryage will occur during transportation, and that its employees are not sulrject to undue
health hazards.
4. The Systems Cleaner shall dispose of the collected sewage only at a designatecl site
recognized by the Board of Health.
Construction Observation
Pr-ior to being backfilled, the construction of the OV/TS and all of the components will need to be
observed by representatives of Mountain Cross Engineering, Inc-
The conclusions and opinions that are exprcssed above are based on the information available at
t}e time of preparation of this report. Any additional infounation presented afterward may require
that these opinions and the design be modified.
Tharik you for the opporttrnity to provide this report. Feel fi'ee to call if you have any questions,
concetÏS, 01' comments.
Sincerely,
Mountain Cross
Chds Hale, PE
Inc.
ej.*
llñquntain Cross Ensineerins. lnc'
Civil and Environmantal Consulting and Design
8261/zGrand Avenue, Glenwood Springs, CO 81601
P: 970.945.5544 F: 970.945.5558 www.mountaincross-eng-com
Attachments
Cdhle Ped^fal
î@fotuq
Druinqe
NÔI
t
å
d
(J
SaNorlh !üodw M{afw$oryWoodlwHM
ña&äLt[mffimumffiryDGUSEþSËEÑæEEñffi8ruMMEbüresffistaEsEÑeDmmslñlRmElswsttw.
I
Aærølt DÌitqry
4¡*
\I-¡q
!òb
\
$!à
q
MütM
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
'Étru
dlmhffiffi
ffiUBMEMPFffiNÈffiGffi
m|Effgffiû
Hf,]&ßFW
Føttà *5 Rùø & t-1/ 4t
YeIlþÐ PIash¿Clç, g@Wd
'IROP COR¡\ER PIS 36572'
aùs
La
I
o
'ls
Bq)\r
Ë.o
R
CINSIRUCTION SPEOtrCATONS
@dk@.
sm rr¡f¡blþf.
Callrrm¡or¡¡¡.
cpffi
1
ff
- lo¡-oas
SoottÉrffil
c. M[
ffi
Eg
q,
th
oË
EËoË
E.E Ff,)FF
Ë *.s
+r Ë trt
EËør=
.Eu]
Êo
s5E
åiË
tåË
¡r I
¡åfr
ÊËt
¡rI
Ð
8zÉ-uPa-
=É€E¡
Ér E¡z.z,
EE
F
gË
rÞ
*
I
u
f
$
r
Eã "2ú
å;ååfrË
=Ê
H5
TE
a6
fc
dEÊ
Êrtu!¡
Er*tlã
g
4
ãg
eè
äì
5
flr
"lta 3,Er
ul
ø)
3-ozU
É
zUU
7U6.
=!É
q
=-ozU
È
z
HJ7
I
ø
J
=Ioz
vts
zU
=Fûe-E
U
ô
óÉ
lts
ızf
Io
z
z.
N@
I
Ê
å
mfuåiffiir¡å¡ffffi
!t---¡
¿
ô
mÉ
P
Ø.ozÞ
o
+
o
ÕÉ
ftsq.
zl
ËI
ältrll
dı5
a
äf
iäI'
t
åËË¡*
d
d
dFlr(rr
H;i4
å
¿
ti4
;Ëå
ËtE.ù*
ä
drgt,
Hêl
E;H:Ë
åigË¡
$
I
*!.¡
:ä
Ë
2
>
F
ä¡¡fiff*¡Í***
i
;i
It
t t
T¡!!
;l
¡!Irll
$
Ë
II¡lttð¡
Ë¡¡l
¡t
rì¡¡
rr3
{Ear
ËEËg
J
É
flr
lt
ä
I
I
I
I
T-|-
-LII
I
I
I-f_
¡
¡
I
I
I
t
I
I
I
I
IIt
I
I
lII
I
I
I
I
I
I
I
I
I
I
I
I
I
¡
II
II
I
TIfI
¡I
I-|-
I-t-
I
I-L
I
II-r
I
¡
¡\
¡
I-r
I
I
I
I
IlI
I
¡II
II I
Il
I
II
¡
¡
I{-
I
I
¡
f
I
t
t
t
t
I
I
I
I
I
I
I
II
I
I
I
¡
I
I
I
I
I
I
I
I
I
lC
I
I¿I
I
IT
I
I+
I
I
I
I
I
I
I
I
I
I
I
II
I
I
t
É
rË
ãzgf
gF
*E
1^
aHúEtct
H
dád
Å6
ã
(\II*-e
q!4e(l
ure¡sÁg luau¡leo¡I ¡q?âiqseJn aUS-uO
ecuaplsaH ilocs
nB@5{qatp@æyF4AOüqqFr{lqr@F@'JNt 'ÐNlugitNlÐNil
SSOUJ NIV¡Nnürl éÐ\y t¡tl
!l
Þ"t$tıo
ôg
7-ã{àfr€
{---- -Y , ,, lllt'nrl*s fs)
GARFIEI.D GOT'IITY BUILT'IilG Affi' ôA¡IITATI{}I EPARTNEilT
f0û Elgùür Srsct, Sulte 2l)i
Ghrsood Spiqgn, Cdor.dof 8{001
Phone (97019r5.ûjl.ll
Þrimlt 4U' 2
Atlctror'r hrcd l{o.
Thi¿ doæ not con$ilult
e building or ulo pËrmit.ITIDIUIDT'AL gEWACE OISFOSAL PEBXT
PSOPEETî 7
PræËltt
q ll')-1
"*"" B?{o- 543ı
Oyrnu.¡5LL+Sy¡trm
Itgd ltËctlptlon ott
SYSTEI DESIìT
]{}a -
fÐ' F\- -t-ir rLQ- þ*r,*
1
{ /*rl Srptic lenk Ctpacily {gdlonl
Fll{AL SYStEt lÌlSPEgflOI{ AllD APPFOVAL {as ¡nsltllsd}
C¡ll for lnspàction {24 hourc nðtlcÈ} Bclora tovering lnstalletion
I f-éÊ-Perc,*i'r Fete {minuleeli *n, ,rTiVYT:
RcquircdAbsorptionArcc-SèÇAlttchÇd 816ü i .: Z ü
.7 tþSpecial Setbeck RùguironrontÐ: I
on .?"7'¡< "l¡",'r{'t Ì'".n Å.
ÐlËtom
Soptic Tank ñlanulaclurcr or Tr¡dã l{lmû '* t"ryu^[
Septic Teok
Srptlc TeßÌ åccrss within 8"
åblorption
^rüe
Abcorgt¡on Àrcr Typc mdlor i¡l¡nulacturur or Tndr tt l[ ì í'r
Ad.quf¡¡ êomphrñc/Ê uilh Couôty ¡nrl Sste reguleli0n#lrqui|Ünìdlls-
ùhe¡
lr6pec-tûr Itr ,it ¿t
RETAIN wlTH RECEIPT RECORTS AT CONSTHT.ETION SITE
rêollDlTloì13:
l. A|| ínrte¡lst¡on mtEt cornply with dl rcquiromonts ol tho Oobildo Statc Bo¡rd qf Hrilth hd¡Y¡duel Sowroc Dlrpoorl Sy¡rcm¡ thætar
25. Arliclo 10 C.F.S. t9?3. Rüti!€d 1S4"
Z. This p€rrñ¡t is y¡l¡d orúy for connrction lo ltructuro¡ whlch hrr'r tully complied wit} Coutty zðn¡ng ¡rld bu¡tding requifrmtnta. CoÞ
nectlon to or usaw¡thiny dwelling ordrucluruo notapprûúËrlBtnd auil(lingandZoning.ollicaühtl¡tr¡tomltlcrllyþÜrYlo¡rtion ors
rÐquirô¡¡r€nt ol lho porm¡t and ciuse to,r Þolh þgtl iËtion rr¡d rüùocslion ol lhc parmlt.
S- Ànypersonwhocon¡tructgelt€r8,or¡nst¡llrrnindividudæUiûtdigpottllyslanlnem¡nnüsftlÊ{línÞlvcúltnovt^¡îg-rndrllllÈrlrl
yrr¡üt¡on lrom ifn tcrml or'spåg{tic.r¡oni cortdnðld tn fhc rpf¡Gatlón ot pármlt commiü¡ ¡ Gl¡¡s l. Fdty Ollanrr {350Û-Û0llor - 6
month¡ in i¡il or both).
Ulttih- fppl lnflll V4ì- tìtÞ¡9'rrrtr¡?
¡
INDTVIDUAL SETAGE DISPOS,åL SYSTEM,APPLICATION
!PHONE t-rt S,zz o
.\
pHONE Bìt S¿"'J
PERMIT REQI]EST FûR (Ð NEW INSTALLATION ( ) ALTERÀTION { } REPAIR
Attach separate sheets or rqnrt showing cntire area with reqpect ¡o s¡¡lgunding arcas, topogaphy of arca, habitable
building loc¿tion of potable water wells, soil percolation test holes, soil profiles in test holes (See page 4).
LOC^ATION OF PRO.POSED FACILITY:
Nearwhat City ofTown :S\r Q,izp of ?-.oot
Lo fT
Legal Description orAddress ÕEÕ
1VASTES TYPE:0o DIryELLING ( ) TRÂNSIENT USE æt4f-e Ð
( ) coMMERCIAt OR INDUSTRIAL ( ) NON-DOMESTIC WASTES
( ) CrruER-DESCRIBE
BUILDING OR SERVICE
Numberof Bed¡oomr 3 NumberofPersons--:IÈÞ-
Sfr.
(¡) GaüageGrinder (Ã),4.utomaticlf,fasher
SIURCE ÀND TYPE ûF 1VATER SIJPPLY: {X) wEtL
Qc) Dishwasher
( ) SPRTNG
If supplied by Community'Water, give name of supplier: \*,,r
{ )STREAMORCREEK
C'"t-Jncs
DISTANCE TO NE.A,REST COMMI.'MTY SEWER SYSTEM:L{ I ,r,*.\.r
Was an etrort made to connect to the Community Systcm?frtrY ¿:rr:tçIc.tL
A$i!e pl¡n is reggired to be sqþ-¡pitted that indicales thc followln&MIMMUM distances:
Le¡ch Fietd to Well: I00 feet
Septíc Tank to !ilell: 50 feet
teach Field to Irrigetion Ditches, Strenm or lVeter Course¡ 50 feet
Septic System (septic t¡nk & disposel field) to Property Lines: l0 feet
youB lhrprvll}ìtAl, sEwacE prsposAL SYSTEM PERMIT \ilIl,t NOT BE I$SIUED 1VITHOJT
å, srTE PLAFI.
GRO-UND CO]'IDITIONS:
Depth to firstGround lVater Table
Fercentfüound Slope
t
TYTE OF INDTVIDU.AL SEWÂCE DISPOSÅL SYSTEM PROPOSED:
{)s sEPrlcrÁ}fK ( ) AERÂTION PLAÌ.IT
( ) vAr,rLT PRrlry ( ) COMPOSTING TOITET
( ) PrT PRIVY ( ) INCINER.ATION TOILET
( ) CHEMICALTOILET{ )
FINAL DISPOSAL BY:
(/() ABSORPTION TRENCII, BED OR PIT
{ ) t NDERGR0UI,{DDISPERSAL
{ ) ^å,BOVE GROUND DISPERSÅL
()
lTfiLL EFFLUNT.IT BE DISCIIARGED DIRECTLY INTO WATERS OF TTIE STATE?
PERCQLATIO¡{ TEST RESIJLTS: (To be completed by Registered Professional Engineer, ifthc Engineer docs the
PercolationTest)
inch inholeNo- I Minutes inholeNo.3
Minutes ¿LLwinch inholeNo. 2
Name, address and tclephone of RPE who made soil absorption tests:
Namq ddress and telephone of RPE responsible for design of the systcrn:
Åpplicant acknowledges that the comple*cnes of the arpplication is conditional upon such fi¡rther mandatory and
additional tests and reports as may be requircd by the local health deparhneirt to be mde and firmishd by the applicant
or by the toc¿l health departrnent for purposod of thc evaluation of thc application; and the issuance of the pcrmit is
subjcct to sl¡ch tcrms and couditions as deemed æresssry to insure complianoe with rulcs and regulations made,
information and reports submitted herewith and required to be submitted by the applicant are or \t'ill be rçresented to
be tn¡e and corrcct to the b€$t of my knowldgc and Hief and arc designd to be relied on by the local deparrnent of
heatth in evaluating thc same for purposcs of issuing üre pennit applied for herein. I fi¡rther undsstaod that any
falsification or misrepresentation may result in the deniat of the application or revocafion of any permit graûtd based
upon said in tcgal action forperjuryas provided þ law
Date
()
{}
()
()
()
()
VAULT
RECYCLING, POTABLE USE
RECYCLTNG, OTHER USE
EVAPOTRA}.¡SPIR.ATION
SA}TD FILTËR
\T¡ASTEWÅTER POND
Signed
MAP TO YOUR PROPERTY!!