HomeMy WebLinkAboutISDS System Design 12.10.2006ffi
CRONK
CONSTBUCTION
INCOFPORATED
lr2S -24- Foad
Grand rlunctionr CO 815O5
970.245.057 7, 97 0-257 -7 4 53 (l axl
I
INDIVIDUAL SE\ryAGE DISPOSAL SYSTEM DESIGN
Date Dccenrber 10,2006
Preparecl by:Thomas A. Cronk, P.E.
Cronk Construction Inc.
I129 -24- Raad
Grand Jurtction, CO 81505
245-4s77
Type of Design: new residence
Owner;William and Arianna Lightfoot
224 A Eldora D¡ive
Battlement Mesa, CO 81635
97 0 -28 5 - t22s, 97 0 -6 4Q-97 A3
Property address: 25 Monument Ridge Road, Batflement Mesa, CO 8l 636
Tax schedule No
Legal Descript.: Lot 9, Monunlent Ridge Subdivision
Page I of8
lJO._Sj¿tHistorv
The site çonsists of opproxirnately 6.355 acres of uncultivated native soil. Drainage is approximately 2"/,
to the west. A percolation test/soils evaiuation was conducted on the property of reference o¡t 12/07106
by Tom A, Cronk; registered professional engineer (R,P.E.), A perc excavation trench (excavation A)
rvas f ocared approximately 201'northwest of the well serving the property and 160' east of County Road
300. Additional perc holes were located 50'southwest of the trench (excavation B), 30'¡rorthwest olfhe
trench (excavation C), and 50'south of the trench (excavation D).
The ¡rørr: test was intended to provide subsurface design parameters for design of alr individual setvage
disposal system (ISDS) for residential use. As based on results fiom this subsurface investigation, the
following ISDS design lras been prepared. Results from the 12107106 perc tesúisoils evaluation are
attached for rel'erence as Appendix A. The locations øf the perc testlsoils observation excavations a¡'e
shown on the artached plot plan.
2J0 .Deyelopment of DeSi gl Parqlngters
A perc excavation trench (excavation A) was extended to a depth of 120" below ground surface {BGS).
There was no evidence of ground water or high seasonal water table in the open exçavafion to a depth of
120'BGS. The soils evaluation indicates three distinct soil horizons underlie the site. A lithological
description follows:
dqpl¡_{i_ÐJ descripJiol
0" - 18"
18" - 42"
42 - 120"
sandy clay, light brownish tan; blocþ; hard
clayey sand,liglrt tan; low density; hard; friable
gravcl (4mnr-5Omm) to cobble to bouiders in light brown to tan clayey sand
matrix
As based on the perc test results (Appendix A), a designperc rate of 25 min/in. is chosen for overall
system sìzing,
Page 2 of8
3-0 Svstgnlesisn
A INFILTR.âTOR absorption trench is proposed lbr discharge of septic efïluent al the site. Construction
of the system will consist of excavating level trenches in the area conprising the absorption field. The
initial excavation shall be continued to a rnaxinrurn deptlt of 48" (see abso¡ption field cross-section).
Follorving conrpletion of the inifial push-out, INFILTRATARS wilt be used to conslruct a sepf ic effluenl
distribrrtion system in the open excavations, The INFILTRATOR e|{1uent distribution system will be
instailed in accordance with fhe "[nlìltrator Technical Manual"n available from Infiltrator Systenrs Inc.,
123 Elrn Street, Suite 12, OId Saybrook, Connecticut06475. AdjacenlINF{LTRÅTORS shallbe tàstened
rvirh a minimunr of four (4) 314'x #8 self-tapping sheet metal or bright brass deck screws to prevent
moventent and separation during backlilling. As shown in the Construction Detail, the bottom oi the
INFTLTR¿TOR seepage trenches wiil be located a maximum of 48" below ground level.
After the INFILTRT4TOR,.! are installed, the absorption field will be covered rvith a soil cap. The soil cap
will consjst of approximately 36" of native soil mounded 50lo to promote surface run olTaway tiom the
absorption field.
The insraller should confirm the feasibility of gravity discharge of sewage effluent fron: the strr¡cture to
the absorption field by field verificalion of assumed design paramefers. Assumed design parameters with
respect to gr-avily discharge include:
r distance fronr exit of sewage pÍpe at foirndation line to absorption field - I 50' or less,
. elevation ofground surface at entry to absorpfion field nrust be aÌ or below the invert
elevation of sewage pipe at exit from foundation line.
If fìeld measurements do not confrrm these design assumptions, gravity discharge of septic effluent fiom
the proposecl structure ca¡t not be assured and a lift station may be required. Please contact the design
engineer to address any desigrr modifications necessâry if lhese design assumptions are not upheld,
The insialler nlus( âlso confirm the setbacks from property lines, building enrielopes, and existing
easernents shorvn in the attached graphics are maintained. Four inch clean outs shall be provided at
maxinrum i00'intervals in alleffluent lines exceeding 100'in length. Vehicle traffic and parking is to be
prevenled over ihe absorption and repair area. Provide minimunl schedule 40 PVC under all traf l¡c areas
Additionally, effluent piping in traffic areas with less than 24" of cover shall be encased in ó" CMP or
flow fìll ancl covered with ¡ninimunr 2" high density blue board insulation. Finalìy, any unknorvn utilíty
lines, easenrents, or otheradvel¡e conditions disclosed durrngconsTructio¡l nlust tlraintain tlie requrreil
setbacks listed on page 5 of th¡s docutnent.
A 1,250 gallon septic tank is required for rctention of septic effluent from fhe proposed lour bedroonl
residence. A non-conodible Orenco iìlter (model # FTW0444-364) shall be installed al the lìnal or¡tlet
Tee of the septic tank or in the effluent line between the septic tank and the absorption field to limi¡ the
size of solids and sludge passing into the absorption fields. The lìlter must be accessible for cleaning and
rc'placement t'orn the ground stlrface.
A distribr¡tion box is required to provide equal distribution of septic effluent from the sep¡ic tank to the
absorption field. The distribution box must be placed on stable native soil or conpacted structural fill to
Page 3 of I
prev€nt setliing ând assure equal distribution ofseptic effluent^
As discussed above, INFILTRATOR absorption trenehes are proposed lo discharge septic e ,fluerìt lo the
underlying su¡b-soils. As shorvn.in the attached gra¡rhics, the absorption lrr:nches will consist of three (3)
rrsnches J' rvide x 4'max. deep x 100'long with twenty five (25) QtllCK4 INFILTUI'OÂ (or'eqrrrvalent)
units each for a total of seventy five (75) units, The absorption flreld willencoìl1påss a gross area cl.900
square t'eet with an effective area ( 19.74 sq. ft. allowed areslINFíLTRÅTOfl of I,480.50 sq. ft.
Calculations and design pafameters used to size the absorption fieìd folloiv.
DESIGN CALCULATIONS
,ArE&4GE FLAW FOR 4 BEDROOM HOME @ ßA GAL,IBEDRAOM'ÐAY
4 X ßA = 600 6¿lL./Ð'4Y
PEÅK FLA\'Y' 150% ÛF A\/ER4GE = 900 GAL.ID'4'Y
DESIGN PERCOLATION RATE = Z5,O MIN.IINCH
o = \rt,uHERE,
5
A = ABSORPTION FIELD AREA
I'PEAK FLOW
| = PERC TIMÊIINCH
a = e?.9¡7¡ = eoo.oo sguARE FEET
5
TNCRE,4SE ABSARPTÍON AREA 8Y 4O% FOR CLOTHES W'4SHER
INCREÅSE AßSORPTTON AREA 8Y 2Q% FOR GÁRBAGE GRTNÐER
DESIGN ARE,4, = 900¡'1.6 = 1440 S?UÁRE FEET
SIZE ,4DJUSTMENT FACTOR OF 0,5 FOR INFILTR.{TOR TRENCH SYSTEM
AÐJUSTED ARE.Á " 1440 X 0.5 = 720 SSUARE FEË,T
LlsE 7s ?UICK4 INFILT\¿TORS @¡ 9,8? SQ. FT. EACH
FOR TCITAL ABSORPTIVE AREÃ, AF 75 X 9.87 = 740.2s SQ. l"T.
ABSORPTTON FIELD SÍZEÐ AT THREE (3) TRËNCIIES 3 FT. x 100 F'?ì = 900 s0. Fl
Page 4 of I
4-0 Si te Spgç i fic. ln qtgl þ!¡94{Qperatig:n Requi rçme¿ts
-l'he orvner and sysrenr rontractor shall be aware and cornply rvith the following installation and syslenr
operation requ irements.
4 ., I ltsg I I a1l:c f¡ -. 9e tb:lc ks. Noli fiçqJion s. a n d Inspect ¡gns-
Al! ingt3llatiqn.a.ctiviÍicq qhall be -cond.uqle¡lin ac¡:ordancg with -cy¡lelt Çoloradg
De¡:ar-tÐ:¡:¡t o-f lleeìth /¿S-0$-¡lgg¿itç¡Lot,f .a.s wellgspny ¡e!eyqnr.Qarfield-CounfJ
Lqgqlations. alrd requirements. If et AIly timq d$rine cofistfucti@. sRÞsurface U!Ê
conditis¡¡Is are gncountçred:vhjch differ-from thg:&siÊu.par¿Eeters de:elqped jn Sggtign
2.0.jQ¡stniç;tio-rlactiqitleswi!! stop-gBd thg-de-sie4-eqlgineer qill bç Sontåcted $ address
a:ly ne g¿ç"sa¡v desi ell-mo{ifi ggtj çtt s.
Installation ¡rrocedures includìng grade, location, setbacks, sçptjc tank size, and
absorption held size shall confonn with the attached graphic details. Construction
activities and system components will not encroach upon existing casernenls or utility
corridors. A minimr¡m of 6 ft of undisturbed soil shall be naintained between indívidual
absorptiorr elements and the septic tank and/or adjacent absorptian elements. Mittinrunt
sile specifìc setbacks tbr system components are:
a
Ò
[opçe
water li¡re
donrestic well
domestic cistçrn
occupied bldng
propeny lirres
subsoiì drairrs
draínage channel
irrigation ditch
ûpen
linedlgaterl
solid pipe
&pticïank
l0'
50'
â(t¿J
5',
10'
l0'
IO'
50'
l0'
l0'
Abso¡ttion Fielrl
25'
100'
2s',
20'
l0'
25'
J<l
Bujldjgg Seu,€¡
t0'
5û'
50'
,<t
¡û'
t To avoid surface flow infiltration and saturâtion of the new absorption system,
abandonrrrent of irrigalion in the vicìni$ cf the disposal systeni is required, Dir,ersiorl
clitchcs necessâry to divert surfâce florvs around the new absorption tred ¡rust urainta¡¡r
¡he mininru¡rl setbacks listed above,
A11 sewer lines and efflue¡rt dislribution piping shal] be 4 inches in diarneter and have
glued joints. INFI!.TRÁTORI shall be placed tevel in the absorption fìeld. All lines
discharging sewage from the r€side¡rce to the septic tank shall maintain fall of between
l/8 i¡r. and ll4 in. per tbot and shall employ sweep 90's or 2-45's at all turns, Server lines
fi'om the drvelling to the septic fank and at least 6 ft from the septic tank outlet musl mee¡
mininum standard ASTM-3034. Sewer lines under driveways shall always nreet
minimum Schedule 40 PVC standards and shall be encased with con'ugated metal pipe or
fì<lw fill and covered with minimum ?" high density blue board insulation when covered
witli less than 24" of soil.
a
Page 5 ol I
a
The installel shall llot place fill in the open excavatiorl unfil inspected and approved by
the design engineer. Additionally, the fìnal cover shall not be placed on sewer lines,
septic tank, ol the absorpfjon area until the systenì has been inspecled and approved by
the design engirreer. Provide 48 hour notice for all required inspections.
Four inch clean outs shall be provided at naximurn 100'intervals in alleffluent Iirres
exceeding 100' in length.
Prevent vehisle traffìc and parking over the absorption field and repair area.
A non-corrodible Orenco fitter (rnodel # FTW0444-364) shall be installed at the final
outlet Tee of the septic tank or in the effluent linç betweerr the septic tank and the
absorption field to limit the size of solids and sludge passing into the absorption field,
The filrer must be accessibìe for cleaning and replacentent from the ground surface.
The djstribution box shall be set level on undisturbed native soil or a structural pad (e,g.,
compacted fìll or concl'eÍe) [o prevent settling and promote uniform distribution of f]orv
tô the âbsorprion field. A 45 degree bend shallbe turned clo"vn on the septic iniJuent lirte
to clamp surge lìorvs fi'om the septic tånk and promo(e equal distribution.
The e ffluent distribution system shall be constructed in acctrdance lvith the "lnliltrator
Technical Manual" available from Infiltrator Systems Inc., 123 Elm S¡reet, Suite 12. Old
Saybrook, Connecticut 4647 5.
The surface cap shall corrsist of natìve soil mounded 5olo ov¡"'r the absorption freld to
promÇte surface runoff.
The systenr contractor shall be aware of the potential for consÍuction activities lo reduce
soil permeabilitics at the site fhrough compaction, snrearing, and shearing. The
following precautions and conshuction procedures shouìd be employed duling
installa¡ion to minimize disturbance to native soils:
o
a
a
I
o
I
I.Excavalion should proceed only when tl'¡e moisturc content of the soil is belorv
tlre plastic limil. If a sample of soil forms a rope instead ol'crumbling when
rnlled between the hands it is too wet and should be allowed to dly beiore
excavation conlinues,
Excav¿tion and backûll equipment should work ft'onr the surface where at all
practioal to avoid compaction of the soils at depth.
The bottom and sidewalls of the excavation shotrld be lelt with a rough, open
surface. 'fhe appearance should be that ofbroken or rippecl soil as opposed to a
sheared, smeared, or troweled surface. Any smoothecl or srneared surfaces
should be removed with a toothed rake or shallow ripper taking care to renlove
loose residucs from the bottom ofthe trench by hand ifnecessary,
Care should be takcn in placing fill materials in the excavation to avoid
darnaging the exposed soil surfaces,
tt¡
)v
Page 6 of 8
{,_2 Qper"ajiqì --M:unlen
The owner shall install a structural barrier if necessary and take precautions 10 prevent
vehicular traffic, exçessive surface walering, accidental flooding, or other aclivilies in
the vicinity of the ahsorption field which may compart, sa[urale, or ütherwise alter thc
subsurface soil parameters used ín designing the sepcic system.
The owner will plant and mai¿tain grâss or other shallow rooted cover crop to preveñt
erosion and promole evapotranspiratiÒn over the absorption field.
The owner will inspect and maintain the required rnounding and drainage away from the
absorption fìsld to prevent saturation from precipitation a¡rd surlàce florvs.
To rrritigate ttre generation of preferential flow channels rvhich nray conrpronrisc the
operation of the system, the owner will inspect and prevent intrusiûn of btrrro"ving
anim¿ls and deep rooted plants into tlre absorption field'
o The septrc effluent fìlter shall be inspecfed and cleaned as necessary every six {ó)
months.
The owner will conduct periodic maintenance of the septic system by removing
accunrulated sludge lio¡rr the septic tânk every 3-4 years ao prevent clogging of the
absorption field.
a
o
a
a
a
Page 7 of I
5,0. Linrilatigl$
This report is a site specific design for installatjon of an individuai sewãge disposal system and is
applicable only lor the client for whom our rvork was performed. Use of this repôrt r¡nder other
circumstances is not an appropriate application of this dscument. This report is a product of'Cronk
Constructjon Incorporated and is to be taken in its entirety. Excerpts from this report mây be taken otrl ol'
context and may not ôonvey the true intent of the repofl. It is the ûlryner's and owner's agen¡s
responsibility to read this report and becomc familiar with the recommendations and design guidelitres
coutaincd herein,
|]rc recomnrendations and design guidelines outlined in this report are bascd on: ¡) lhe proposed site
development and plot plan as furnished to Cronk Construction Incorporated by the client, and 2) lhe site
condif ions disclosed ât Íhe specific time of the site investigation of reference. Cronk Construc(ion
Inco4rorated assumes no liability lor the accuracy or completeness ol information ltrrnjshed by the cliettt,
Site conditions are subject to external environnrental etfects and may change over time. Use of thrs plan
under different site co¡lditions is inapplopriate, If it becomes appârent that current site conditions vary
fì.om those anticipated, the design engineer should be cont¿cted to develop any required design
rrroclifìcations. Çrorrk Co¡struction incorporated is not responsible and âccepts no liability lor any
valiaf ion in assunrec{ design pammeters.
Cronk Construction lncorporated represents this report has been prepared within the limíts prescribed by
the orvner alld in accordance with the current accepted practice of the civil engineering prof'ession in the
area. No wa:-ranty or representation either expressed or implied is included or intended in this report or
in any ofour centracts,
SEAL
Thomas A. Cronk, P.E.?r'"0
,rLy ::f1..,*,-( %=
nu,.jr*, ll,).1ç;;L
NOTE: This inrtivitlual servage disposal plau is meant to include the t'ollorving I'our pages of
grnp¡ics incluiling: l) plot plen, ?) septic layout plan,3) absorption lield plan view, anrl 4)
absorption fîelrl cross section. The plan is not to be lmplemented ln the absence of fbese related
grapftics, In addition, results from the percolafion test and solls evaluation lre includetl lbr
refcrence as A¡lpentllx A.
Page I of8
perc test
exçqvûtlôn, typ,
c0
,e
stope ?f
6.355 qcres
*^\'-{2o'¡s
----*
7,5'¡Jt¡t¡ty &
drqinogP FûsPnânt
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E{tfu
f-z¡cl
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//
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drolnoge eoseñent
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ve
LIGHIFI]OT PROJECT
E5 Í'IBNUTENT RIDGE R¡,
SATTLElIËNT ¡,lESA
PLBÍ PLAN
DECEI.IBËR 9, ¿006
SCALT' l'-!00'
{
fi
NORTH
Qn
"4Ò
NTIETHE TOLLNVIÑG SETBAC(S TqUsT Ee MAINIAINEÐISEPTIc ABSoRPTJ0NTANK ÊIÊt NSPRINGS,/VELLS - 50,LAKÊ/S TRÊAM./¡RRIG, ÐITCH - 50,GATED PÍPq/TNI. IRRIG. DITCH- rO.DOMESTTC I*IATER LINT100'50,ê5'NOTrA8éNDEN FLOBD iRRlGAli{IN\rIT|-{IN :0, t!Ê ANY iSDSÊLÊ',IENT, ÎYPICâLslèFê ?1.N0fËPRÛV]DE 4' CLEAN OUIS AT MAXI¡,lUI1lOO' INÌERVALS ¡N ALL EFTLUENTLINES EXCETDING IOO' IN LENGTHM]IECALL I-8OO-98¿-I987 FT¡R UTILITYLOCATES BEFI]RE EXCAVATINGobsôrpt¡Ön fietd consisting oF3 trenches yith 25 Qu¡ckiinF¡ttro.tons (or equivolent) eochfor o toto( of 75 uñitsPerC testexcovût¡ûñ, typ.NOT€GRAV¡IY ÐISCHARGE TF SE\JAGTETFLUÊ!¡I FROÍ'Î THE RESIDENCEÏ0 THE DISPOSAL SYSI:f,t isBAS€D ÛN TIJE TELLOVTNG DESIGNASSUMPTITINSILENGTH OF SEL'A6[ PIP¡NGFROH EXII AT FOUNDATITNLINE TB €NTRY IÛ ABSORP¡IÛNFIELD = I50'OR L€SSELIVAT¡ON I]F GROUND SURFACEAT INTRY TG ABSORPTITN FIELD= AT OR BÊLOìr' ¡NVERTELEVATION tìF SEVAGE PIPC ATCXiÏ FROM FEUNDATIÍ]N LTNEDISCLAiMERIF IHËSE DESIrN ASSUITPIIBNS ARENTT UPNELD DURING CONSTRUCTJBN.GRAVITY DISCHARGE CAN NOT EEASSUREO 4ND A LTFI STAITII.¡ ¡AYÊÊ' REOUTRÊN(:)c)cr)aouF>fE(-J3'.tvp.-u-**--lrePtlroreqCIxsfû¡néoù(,6.-<éEtfò(vclecn out.os required\-\-L_*-JI\l?50 got(on sept¡c tonk r,/EÉFtyent Êitter (0SI Mode(FIv0444-36A) r\Sch€du(e 40 under ôlt trôFlicôreâsj if less thôn â4- coveeenco,se iñ 6'CMP or fto*Filtw/?'blueboord cÕve.,1u"{/ -o^/ orl/,:,Ê/9t/8/*1clernoqtresidenCe<49'x66')I6HIFI]TIT FRTJICTMENUMENT RIDGI RD.BATTLEMTNT I4TsASEPIIC LAYEUI PLANDecEffB€R 9. ¿0û6SCAL.C, l'=+0'NO*ÎHqe(t
{
I
Í
f
I
I
I
I
ô.bsorpt¡on Êletd cÖnsistlng ÕÊ
3 rô*s of ¿5 oulck4 fnÊ¡ttrttors (or equ¡votent)for o totol of 75 uñlts
Septic inÊlupnt
dis tribution box
v)fr,
Þrov¡de inspectlon./ventlng portsqt eqch end ol lnÊiltrotor
trenches os sho|n
ABSTRPTII]N FIELD - FLAN VIEU
SCALE¡ l'=?0'
L¡GHTFOI¡T PRNJECT
E5 MONUMENT RID6E RD
A¡SORPTION FIËLD . PLAN V¡EV
DECEI'iBIR 9. a006
SCALE' l'=?0'
aa
,['
8'. tvp.
¡a
6' nln,(10'-l?' rscor4fien€led)
a a
ßl
pe
!3
PROV¡IIE VENIIN6/¡NSPECTION
PORTS AS REOUIRED EY
INFIL TPATBR INSTALLAïIgN
6UIlELTNTS, IYP. EACH
ROV (ONE OF IHREE)
soIL cAP (¡'rouND 52)
OR SCAR¡FY UNDER
ÍNF]LIRATOR, TYP
INFIL ÏRAT
VIIH 'INF
EXISIINı 8ROUND SURFACf
o
- 4?'.
I i-- 3ó' ¡
l--- 6' MIN.,ryP, -_-*.1' (10'-12' PRTFpREt> '
¡NTILTRATI]R SYSTSMS
STREE¡, SUIIE IE, OLDctNNecrtcul 06475
iNc.. r¿3 rLò4
SAYBROOK,
ABSBRPTIBN F¡ELÐ - CROSS SECTION
SCALET l'=5'
- l¿0'
soILS LoC(SE[ NOTES)
OUTLEÌS AS REOU¡RII)
4'4s'-Bf,NO SURöE
FLOV SUPPRCSSOR
DiSTR¡BUTIÛN BOX DETAIL
SÇALE'l'*l'
SI]ILS LO6 NOTES
$l - SANDY CLAY, LI BR0VNISH TAN; 9LOCKY¡ HARD
He - CLAYIY SAN!, L1 IAN¡ LDV D€NSIIY; hARB & FRIABLC
13 - GRAVEL (4MM-sOI"IM) TÐ COBBLE TI] BTULÐERS tNLI BROVN TO TAN CLAYTY SAND HAIRÍX
NO GRTUNÐVATER OR HI6H SEASONAL VAIER
IABLE TO I¿O' 865
FI]OI PROJECT
HONUMENT R¡'6T ED.
I]ON FIELI} - CRTSS SECTIONR 9, ¿006
AS SHOVN
INLET
COMPACTIÐ NAT¡VE SO]L OR SÍRUCÏURAL
F¡LL TO PREVENT SITILJNC
APPENDIX A
SOILS AND PERCOL,ATTON REPORT
CRONK CONSTRUCTION INCORPORATED
CRONK
CONSTRUCTION
INCORPORATED
1l2g -24- Road
Grand Junction, CO 815O5
970.245.0577, 970.257.7453 (fax)
o
Date
SOILS AND PERCOLATION REPORT
December 7,2006
Prepared by Thonras A. Cronk, P,E.
ll29 -24- Road
Grand Junction, CO 81505
24s-0577
Client;William and Arianna Lightfoot
2244 EIdora Drive
Battle ment Mesa, CO 81635
(e7 o) 28s - | 22s / (97 o) 640 -97 A3
Property address:
Tax schedule No.:
LegalDescript,:
L0 SoiLg_EValuation
25 Monument Ridge Road, Battlement Mesa, CO 81636
Lot 9, Monument Ridge Subdivision
The site co¡lsists of approximately 6.355 acres of uncultivated native soil. Drainage is approxinutely 2%
to the west, A percolation test/sojls evaluation was conducted on the property of reference on Dß7/A6
by Tom A. Cronk, registered professional engineer (R.P,E.), A perc axcavation trench (excavation A)
was located approximately 201' northwest of the well serving the property and 160'east of County Road
300. Additional ¡terc holes were located 50'southwest of the trench (excavation B), 30'northwest of the
trench (excavation C), and 50'south of the trench (excavation D).
A perc excavation trench (excavation A) rvas extended to a depth of 120" below ground surface (BCS).
There rvas no evídence of ground water or high seasonal water table in the open excavation to a depth of
I20" BGS. The soils evaluation indicates three distinct soil horizons underlie the site. A lithological
description follotvs:
denth lin.) descriution
0" - 18"
18 -42"
42" - l2A"
sandy clay, light brownish tan;blocþ; hard
clayey sand, Iight fan; low density; hard; friable
gravel (4rnnr-50nrm) to cobble to boulders in líght brown to tan clayey sand
matrix
Page A-l of A-3
Pe¡z holes were constructed in excavation A at a depth of approximatcly 80 in. Additional ¡rerz holes
were consh'ucted in excavation B at a depth of 42 in., in excavation C at a de¡rth of 38 in., antl in
excavation D at the suriace and at a depth of 38 in. The holes appeared to be wel¡saturated at the time of'
the tesf. Results of the percolation test are shown in Table L
TABLE I
Percolalion Test Results
2J Monunrenl Rírlge Road
t)epth Ti¡¡con l210?/0ó Tínle
Diop
Pe¡<
Rate
min/inl5:10 l5:50 ló; I0 l6:30
f^) 80" - 92'5.5 7.5 9.25 9.75 60/4.25 t4
(B)42 -5f 6.0 8,875 10.5 12,0
drv
ó0/ó.0 ¡0
(c) 18" - s0'{).75 8.75 t0.25 i I.J7t 60/4.62s t3
(f))0" - I2"5.J ?5 6.875 8.1 25 9,0 ()ùlJ.(r25 l]
{c) 38" . Jn'ó.1 ?5 ?.()25 9.û 9.5 ó0l-1.17-5 ¡8
2.0 Conch¡sions and Recommendations
Soils at the site åppear acceptable for inrpìementatio¡r of an indivídua¡ sewage disposal system (ISDS),
The fbllorving site-specilic considerations should be observed during intplenrentation of the ISDS:
The bottom of the ISDS absorption fìeld should be located no deeper than 48" BGS to
promote evapotrânsptration and maximize âerobic treatment of septic effluenf . A design
perc rcte of 25 minlin. is recommended for overâll system sizing.
Care should be taken during construction to avoid compaction and snrearing of the
exposed infiltratjve surfaces and preserve the natural permeâbility of the native soils,
I
a
Page A-2 of A-3
3-L Linit¡fío¡u
This reporl provides a professionalassessment of the tèasibility of implernenting an individual sewage
disposal sysrem on fhe prcperfy ofreference. The design parameters developed in this docuntent are
representarive of'the site conditions disclosed at the specific time of the site investigation. Site
co¡rditions ale subject to change from external events both mannrade (irrigatron or pond construction)
and naturally occurring (flooding or excessive precipitafion). Cronk Construction lncotporated is nol
responsible and accepts no liability for any variation in assumed design parämeters caused by extemal
events.
Cronk Construction Incorporated represents this report has been prepared within the limits prescríbed by
the orvner and in accordance with the current accepted practice ofthe civil engineering profession in the
area. No warranty or representation either expressed or implied is included or intended in this report or
in any ofour contracts.k
ly þ-$"
Thomas A. Cronk,
Date
lt 7d.>6.
Page A-3 of A-3