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September 28,2007
David Hunsicker
2665Balnmas Way
Grand JunctiorL Colorado 81506
Job No. 107
Subsoil Study for Foundation Desþ and Percolation Test, Proposed
Residence, County Road 3ll @ivide Creek Road), About 8 Miles
of Silt, Garfield County, Colorado
Dear Mr. Hunsicker:
As requestd Hepworth-Paw¡ak Geotechnic{ Inc. performed a subsoil study for
of foundations and percolation test for an on-site wastewat€r freatment system at the
subject site. The study was conducted in accordanc€ with our agreement for
engineering services to David Hrmsicker dated August 14,2007. The dataobtained
our reconrmendations based on the proposed constn¡ction and subsr¡rface conditions
encountered ar€ pres€nted in this r€,poft. Evaluation ofpotential geologic hazar.d
to developmeirt of the site is beyond the scope of this study.
Proposed Construction: The proposed residenc€ will be a single story modular
building over a partial garden level basement with an attached garage located on the site
as shown on Figure l. The basement floor will be slab-on-grade. Cut de'pths are
expected to range between about 4 to 6 feet. Foundation loadings a¡e assumed to be
relatively ligbt and typical of the proposed type of construction. fui on-site wastewater
treament syste¡n is proposed to be located to the west, downhill of the proposed
residence.
If building conditions or foundation loadings are significantly different ûom those
described above, we should be notified to re-evaluate the recommendations presented in
this report-
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HEPVúORTH - PAWLAK GEOTEC|ìNTCAL
Subject
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Site Conditions: The lot was vacant at the time of our field exploration and is located on
the sor¡th (downhill) side of County Road 311 (Divide Creek Road) approximately 8
rniles south of Silt. Divide Creek is located in a relatively shallow, steeply sided channel
about 200 feet west of the proposd building area, The water level in the creek was on
the order of 15 to 20 fú.below the proposed building rirea at the time ofor¡r field
exploration and the creek sides were t¡,pically about 10 feet hrgh. A dry e,phemeral
drainage is located roughly along the south propøty line. An existing water well is
locatod just west ofthe proposed buitding area. The g¡ound zurface in the proposed
buitding area is relatively flat ûo sliglrtly irregular and gently to moderately sloping down
to the west. Vegøation consists mainly of weeds with scattered juniper trees and mature
trees abng the creek sides. Large boulders are located along the creek channel.
Subeurface Conditions: The subsurface conditions at the site were evaluated by
orcavating two exploratory pits in the area ofthe proposod building and one profile pit in
the proposed on-site wastewaterfieatment site as sbown on Figure 1. The logs ofthe pits
are preseirted on Figure 2, Thrc subsoils enoounterod, below aboutYz foot oftopsoil (root
zone), t¡pically consist of medium stif[, sandy silty clay dov.'n to the maximum explored
depth of 8 fu. A medium dense layer, approximateþ 2 feet thiclq of silty to clayey
sandy gravel with cobbles and small boulders rÃ'as encountered at a dqth of 3 feet in Pit 2
and just below the topsoil (root zone) in P-3. Results of swell-consolidation testing
performed on relatively undistr¡rbed samples ofthe clay, presented on Figrnes 3 and 4,
indicate low cornpressibility under existing moisture conditions and light loading, and a
low collapse potential (settlement under constant load) after \A'etting. The samples
showed moderate to high compressibilþ with increased loading afrer wetting. No ftee
water was observed in the pits at the time of excavation and the soils were slightly moist
to moist. A well construction and test report for the water well drilled on the lot prepared
by Shelton Drilling and provided by Mr. Hunsicker indicates Wasatch Formation bedrock
at a depth of 20 feet below the site.
Foundation Recommendaûons: Considering the subsoil conditions encountered in the
exploratory pits and the nature ofthe proposed mnstructior¡ it should be feasible to
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support the propsed residence on spread footings or a mat foundation placed on the
undisturbed natural soil desþed ôr an allowable soil bearing presr¡ure of 1,000 psf with
a risk ofdifferential foundation settlement. A mat foundation a¡rd continuor¡s perimeter
walls would make the fourdation more rigid and 'box-likd', and help to lirnit differential
settleme¡rt across the building footprint. A dee,p foundatbn'systerr¡ such as helical piers
or scrsw pileg that extend down into the rurderlying bedrock would provide npderate
load capacity with arelatively low risk of differential settlement. 'We should be contac'ted
to provide additional analysis and recommendations if a deep foundation s¡ntern is
proposed.
The upper clay soils tend to oompress under load afrer wetting and there oould be some
post-construction differential settlement for the spread ñoting or mat foundation
altematives. The settlement oould be on the order of I to 2 inches depending the depth
and extent of any wetting. Footings should be a minimum width of 20 inches for
continuous walls and 2 feet for columns. Topsoil and loose or disturbed soils
encounterod at the br¡ndation bearing level within the excavation should be removed and
the foundation bearing level exte,lrded down to undisturbed natural soils. Exterior
footings or edges ofmats should be provided with adequate cover above their bearing
elevations for frost protectbn Placemeirt of for¡ndations at least 36 inches below the
exterior grade is t¡pioally usd in this area- A shallow frost protection system consisting
ofrigid foam insulation could be r.¡sed in the mat foundation altemative. Continuous
foundation walls should be reinforced top and bottomto span local anomalies such as by
assuming an unsupported length of at least 12 fú'.
Foundation ¡nd Ret¡ining \ilalls: Foundation walls and retaining structures which are
lateraþ supported and can be expected to undergo only a slight amount of deflection
should be designed for a lateral earth pressure computed on the basis of an equivale'nt
fluid unit weight of at least 55 pcf for backñtl consisting of the on-site soils. Cantilevered
retaining stn¡ctures which are separate from the building and can be expected to deflect
sufñcientlyto mobilize the full active earth pressure condition should bc designed for a
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lateral earth presstue computed on the basis of an equivalent fluid r¡nit weight of at least
45 pcf for backfill consisting ofthe on-sÍte soils.
All foundation and retaining struc'tures should be designed for appropriate hydrostatic and
surcharge pressures such as adjacent footings, trafüg construction rnaterials and
equipment. The pressures recornmended above assume drained conditions behind the
walls and a horizontal baokfill surface. The buildup ofwater behind a wall or an upward
sloping backfill surface will increase the lateral pressure imposed on a foundation wall or
retaining stn¡ctt¡re. An underdrain should be provided to prevent hydrostatic pres{¡ure
buildup behindwalls.
Backfill should be placed in uniform lifrs and compactod to at least 90% of the maximum
standa¡d Proctor deirsity at near optimum moisture contenl Backfill in pavement and
walkway areas should be cornpacted to at least 95% ofthe maximum standard Proctor
density. Care should be taken not to overcompact the backfill or ̡se large equipment
near the wall, since this could cause excessive lateral pressufe on the wall. Some
settlement of dee,p for¡ndatbn wall backñll should be expected, even ifthe material is
placed correctly, and could result in distress to facilities constructed on the backfill.
The lateral resistance of for¡rdation or retaining wall footings will be a combinæion ofthe
sliding resistance of the footing on the foundation materials and passive earth pressure
against the side ofthe footing. Resistance to sliding at the bottoms of the footings can be
calculated based on a coefficient of ûiction of 0.35. Passive pressì¡re of compacted
backfill against the sides ofthe footings can be calculatod using an equivalent fluid unit
weight of 300 pcf. The coefficient of füction and passive pressure valuæ recommended
above assume ulti¡nate soil strengh. Suitable factots of safety should be included in the
design to limit the strain which will occur at the ultirnate strengtb, particularly in the case
of passive resistarice, Fill placed against the sides ofthe footings to resist lateral loads
should be compactod to at least 95% ofthe maximum standard Proctor density at near
optimum moisture @ntent.
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Floor Sl¡bs: The natural on-site soils, exclusive oftopsoil, are suitable to support lightly
loaded slab-on-grade construction. To reduce the effects of sorne differential movement,
floor slabs should be separated from all bearing walls and columns with expansion joints
which allow unrestrained vertical movement. Floor slab control joints should be r¡sed to
reduce damage due to shrinkage cracking, The requirements for joint spacing and slab
reinforcement should be established by the designer based on experience and the intendd
slab use. A minimum 4 inch layer of freedraining gravel should be placed be'lreath
basement level slabs to facilitate drainage. This material should oonsist of minus 2 inch
aggregate with less than 50% passing the No. 4 sieve and less tlw2o/o passing the No.
200 sieve.
All fill rnaterials for support of floor slabs should be compacted to at least 95% of
mæ<imum standard Proctor density at near optimum moisture content. Required fill can
consist of the on-site soils devoid of vegetation, topsoil and oversized rock.
Underdrain System: Afthough ûee water \ras not encountered during our exploration, it
has been our experie,nce in the area that local perched groundwater can develop dtning
times of heavy precipitation or seasonal n¡noff Frozen ground during spring runoffcan
create a perched condition, We recommend below-grade constructior¡ such as fetaining
wallso crawlspace and basement areas, be protected ûom wetting and hydrostatic pressure
buildup by an underdrain systert
The drains should consist ofdrainpipe placed in the bottom ofthe wall backfill
surrounded above the invert level with ûee-draining granular material. The drain should
be placed at each level of excavation and at least 1 foot below lowest adjacent finish
grade and sloped at a minimum lo/oto asuitable gravityoutlet. Freedraining granular
material used in the underdrain system should contain less than 2o/o passtttgthe No. 200
sieve, less than 5tr/o passing the No. 4 sieve ard have a maximum size of 2 inches. The
drain gfavel backfilt should be at least lYzfeet deep, An impervious membrang such as a
20 or 30 mil PVC liner, should be placed beneath the drain gravel in a trough shape and
attached to the foundation wall with mastic to prevent wetting ofthe bearing soils.
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Surf¡ce Drainage: The following drainage precautions should be observed during
construction and maintained at alltimes afrer the residence has been completed:
l) Inundation of the foundation excavations and r¡r¡derslab areas should be
avo ided druing constn¡ction.
2) Exterior backfill should be adjusted to near optimum moistwe and
compacted to at least 95% ofthe maximum standard Proctor density in
pavement and slab areas and to at least 90% ofthe maximum standard
proctor densþ in landscape areas. Free-draining wall backfill should be
capped with about 2 feet ofthe on-sitg finer graded soils to reduce surface
water infiltr*ion.
3) The ground surface surrounding the exterior of tbe building should be
sloped to drain away from the formdation in all directions. we
recommend a minimum slope of 12 inches in the first 10 feet in unpaved
areas and a minimum stope of 3 inches in the first l0 feet in pavement and
walkrray areas. A swale may be needed uphill to direct sr¡rfaoe runof[
around the residence.
4) Roofdownspouts and drains should discharge well beyond the limits of all
backfill.
5) Sprinkter heads and landscaping which requires regular heavy inigatiorL
such as sod, should be located at leåst l0 feet from the buildìng.
Consideration should be givento theuse of xeriscape to limit potential
wetting of soils below the for¡ndation caused by irrigation'
Percolation Testing: Percolation tests were conducted on Se'ptember 19,2007 to
er¡aluate the feasibility of an on-site wastewater treatment system at'the site. One profile
pit and tl¡ee percolation test holes were dug at the locations shown on Figure I' The test
holes (nominal 12 inch diameter by 12 inch deep) were hand dug at the bottom of shallow
backhoe pits and soaked with water one day prior to testing. The soils exposod in the
percolation holes are similar to those exposed in the Profile Pit shown on Figure 2 and
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Job No. 107 0623
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typically consist of sandy silty clay with occasional gravel. A medium dense gtavel layer,
about 2 feet thicþ was encountered just below the topsoil (root zone) at P-3.
The percolation test results are presented in Table 2. Peroolation test resuhs indicate a
infiltration rate of 60 minutes per inch. Based on the subsurface conditions encountered
and the percolation test results, the test area should be suitable for an on-site wastewater
treatment systern 'We recommend the inñltration area be oversized due to the relativeþ
slow percolation rate. A registerd professional engineer should design the infiltration
se,ptic disposal systeÍt
LÍmitations: This study has been conducted in accordance with generally accçtod
geotechnical engineering principles and practices in this trea atthis tima We make no
warranty either express or implied. The conclusions and recommendations submitted in
this report are based upon the data obtained ûom the exploratory pits excavated at the
locations indicated on Figure I and to the depths shown on Figure 2, the proposed $pe of
construction, laboratory and percolation test results and our experience in the a¡ea. Our
services do not include determining the ptesencg prevention or possibility of mold or
other biological contaminants (MOBC) developing in the future. Ifthe client is
concerned about MOBC, then a professional in this special field ofpractice should be
consulted. Our findings include interpolation and extapolation of the subsurface
conditions identiñed at the exploratory pits and variations in the subsurface conditions
may not become evident rmtil excavation is performed. If conditions encountered during
construction appear different from those described in this report, we should be notified at
once so re-evaluation of the recommendations may be made.
This report has been prepared for the exclusive use by our client for desþ purposes- We
are not responsible for technical interpretations by others of oru information. As the
project evolves, we should provide continued consultation and field services during
construction to review and monitor the implementation of our recomme,lrdations, and to
verifu that the recommendations have been appropriately interpretod. Significant design
changes may require additional analysis or modifications to the recommendations
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presented herein We recommend on-site observation of excavations and foundation
bearing strata and tasting of stn¡ctural fill by a rqresentative ofthe geotechnical
ørgineer.
If you have airy questions, or if we may be of fi¡rther assistancg please let us know.
Respectfirlly Submitted,
HEPWORTH. PA INC.
Trevor L.
Reviewed by:Th/
Steven L. Pawlak, P.E.
TLKJcay
attaohments Figure 1 - Loc¿tions of Exploratory Pits and Percolation Test Holes
Figtne 2 - Logs of Exploratory Pits
Figrrres 3 and 4 - Swell-Consolidation Test Results
Table 1 - Summary of Laboratory Test Results
T able 2 - Peroolation Test Results
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HEPì¡'OFIH.PAWLAI( G:O'iECII|SCAT
LOCATIONS OF Ð(PLORATOBY PITS AND
PERCOTATION TEST HOLES FIGURE 1
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TOPSOIL; sandy s¡lty clay, root zonê, f¡rm, mo¡st, dark brou,m.
CIAY (CL): sandy to very sandy, sÍlty, with occasional gravd, med¡um sl¡ff to st¡ff, sliglttly moist to moist,
broun, low plaslicity.
GRAVEL (GC-GM); silty to clayey, with cobUes and smâll boulders, medium dense, slighdy moist to moist,
brown.
þ Relatively undisturbed hard ddve sample.
NOÏES:
1. Exploratory p¡ts were excavated on September 13,2007 with a backhoe.
2. Locations of exploratory p¡ts were measured approximately by pacing from features sholvn on the site plan prwided.
3. Elevations of exploratory pits were not measured and the logs of exploratory p¡ts are dratrtn to depth.
¿. The exploratory pit locations and elevations should be considered accurate only to the degree implied by the method
used.
5. The lines bdween materials shown on the exploratory pit logs represent the approximate boundaries between
materialtypes and transitions may be grâdual.
ô. No free water was encountered ¡n the pits at the time of digging. Fluctuation in water level may occur with time.
7. Laboratory Testing Results:
WC : WaterContent (% )
DD = DU Density ( pcl)
-200 = Percent passing No. 200 sieve
107 0623 e&Ftecrr
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LOGS OF EXPLORATORY PTS FIGURE 2
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HEPWORTH-PAWLAK GEOTECH NICAL, INC.TABLE 1SUMMARY OF LABORATORY TEST RESULTSJob No. 107 0623oÈ8()lLTYPESandy silty clay withSandy silty claySandy silty cþUI{OONFINEDcoitPREssrvESlRENGTH(PSF}A TERBERG LIT¡llÏSPLASTþINDÊXlo/olL|QUTOLllrllT(oÁlPEROENTPASSINGNO.2@SIEVE5965SANDeh,GRAVELlo/olNATURALDRYOENSITYlocfì929798NATURALI,IOISTURECONÏÉNTl%ol8.69.6I1SATIPLE LOCATIONDEPTHtñl265PITNO.12ÈoG¡oFoooLÈfE
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TABLE 2
PERCOI.ATION TEST RESU LTS
Note: Percolation test holes were hand dug in the bottom of backhoe pits and soakedon September 19, 2oo7. Percolation-tests were conducted
"n däpt"rber lg,2oo7. The average percolation rates were based on the las[tr"ã ieadings ofeach tesL
JOB NO. 107 0623
HOLENO HOLE
DEPTH
(rNcHES)
LENGTH OF
INTERVAL
(frilN)
WATER
DEPTH AT
STARTOF
INTERVAL
(rNcHES)
WATER
DEPTH AT
ENDOF
INTERVAL
(rNcHEs)
OROP ¡N
WATER
LEVEL
(rNcHES)
AVERAGE
PERCOTâTþN
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(MtN.flNCH)
P-1 ß 16 7 6t/t %
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6%6%%
6%6 Y.
6 6t/¿Y.
ít/t l/t %
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6Y.6 Yz
6 5%Y.
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An Emdoyac Oryned Compsny
5020 County Road 154
Glenwood Springs, CO 81601
phone: (970) 945-7988
fax: (970) 945-8454
email : kaglenwood@kumarusa.com
www.kumarusa.com
Office L¡cations: Denver (HQ), Parke¡ Colorado Springs, Fon Collins, Glenwood Springs, and Summit County, Colorado
December 15,2021
Trevor Ruonavaara
160 Spring Ridge Drive
Glenwood Springs, Colorado 81601
trfinishes@gmail.com
Project No.2I-7-923
Subject: Update of Subsoil Study Report, Proposed Residence, TBD County Road 311,
8 Miles South of Silt, Garfield County, Colorado
Trevor:
As requested, a representative of Kumar & Associates reviewed the subject site conditions and
the current proposed development plans for geotechnical conditions. The findings of our review
and recommendations for design of the residence are presented in this report. Hepworth-Pawlak
Geotechnical (now Kumar & Associates) previously conducted a subsoil study for a proposed
residence at the subject site and presented the findings in a report dated September 28,2007, Job
No. 107 623. The findings presented in the previous report have been used as the basis for the
current review and report update. The update was conducted in accordance with our professional
services agreement with you dated December 9,2021.
Development Plans and Site Conditions: Current development plans are for a single-family
residence located within the area evaluated for geotechnical conditions by the previous
subsurface study, see attached location plan from the previous subsoil study report. Based on
our literature review and recent site visit, the proposed development area conditions appear
similar to those when the previous subsoil study report was provided in Septernber 2007. The
property is currently vacant with relatively natural ground surface of weeds and scattered juniper
trees. The subsurface conditions identified at the site by the previous exploratory pits to the
depth excavated of about 8 feet, below the topsoil, consisted mainly of sandy silty clays with
silty clayey gravel with cobbles layers and no groundwater level.
Conclusions and Recommendations: The current site conditions are generally consistent with
those described in the previous report and we anticipate the subsurface conditions to also be
essentially the same in the current proposed building area to those described in the previous
report. Therefore, the recommendations presented in the September 28,2007 report can be used
for the current proposed site development and building foundation design.
If you have any questions or need further assistance, please call our office.
Sincerely,
Kumar & Associates, Inc.
Steven L. Pawlak, P
SLPlkac
1r,ßn2
Attachment: Building 2007 Report)
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107 0623 LOCATIONS OF Ð(PLORATORY PITS AND
PERCOI.ATION TEST HOLES FIGUBE 1
Ruonavaara PropertyWrite a description for your mapDivideCreek
GDqPublic,nef" Garfield County, CO
Account
Number
Parcel Number
Acres
Land SqFt
Tax Area
2019 Mill levy
R042346
240172400263
2
o
023
73.8920
Physical
Address
Owner Address
0
srLT 81652
RUONAVAARATREVOR
483óAPUUWAIROAD
KALAHEO HI9674t
2019Total Actual
Value
Overuiew
Legend
! Parcels
Roads
Parcel/Account
Numbers
Highways
: LimitedAccess
- Highway
' Major Road
- ' Local Road
'' Minor Road
Other Road
Ramp
-- Ferry
Pedestrian Way
Owner Name
I i Lakes&Rivers
- CountyBoundary
Line
$125,000 Last2Sales
Date Price
77/2U2O27 $1ós,oo0
7O/18/2O1O $s0,000
Date üeatediu23/2022
Last Data Uploaded 2/23/2022 2:O7 :24 AM
Devero'edotC)F."¡F""^,rqRI
2123122, 11:26 AM
Account
Parcel
Property
Address
Legal
Descrlptlon
Acres
Land SqFt
Tax Area
MillLew
Subdlvision
qPublic.net - Garfield County, CO - Property Record Card: R042346
G)qPublic,nef" Garfield County, CO
Summary
RO42346
2407724ñ263
_srLT.co 81ó52
Section: 12 Township: 7 Range: 92 A PCL OF LAND lN THE NWSE. AKA
LOT 2 JOSEF P LANGEGGER SUB.DIV EXEMPTION
2.259
0
23
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@,llep
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RUONAVAARA,TREVOR
483óA PUUWAI ROAD
KALAHEO HI 9ó741
Land
UnitType 1AC TO t-lT 5 AC - 0520 (VACANT LAND)
Square Feet 0
Actual Values
Assessed Year
Land Actual
lmprovement Actual
Total Actual
Assessed Values
Assessed Year
Land Assessed
lmprovement Assessed
Total Assessed
Tax History
TaxYear
Taxes BÌlled
202L
$2,678.60
2020 2079
$r,282.28
2027
$125,000.00
$o.oo
$125,000.00
202t
$3ó,250.00
$o.oo
$3ó,2s0.q)
20ta
$7,032.76
2020
$70,000.00
$o.oo
$70,æ0.00
2020
$20,300.00
$o.oo
$20,3æ.00
2077
$923.96$7,361,.96
Clìck here to v¡ew the tax information for this Þarcel on the Garñeld Countv Treasurer's website.
Transfers
Sele Date
17/22/2027
to/78/20ro
6/77/2æ9
5/30/2006
5/30/20o6
5/U2005
70/70/2004
4/5/2004
3t8/2004
9/11/2003
7t24/1986
r/7/7900
7/t/1900
7/1.tLgoo
7/U79æ
Reception Number
967198
793103
787898
699647
699646
673466
662069
649785
649786
ó3803ó
Book - Page Sale Price
$1ós,000
$so,ooo
$o
$o
$1¿10,000
$7o,ooo
$o
$o
$o
$o
$o
$o
$o
$o
$o
Deed Type
SPECIALWARRANTY DEED
Warranty Deed
QuitClaim Deed
WARRANTYDEED
WARRANWDEED
WARRANTYDEED
DECLARATION
RESOLUTION
EASEMENT
AGREEMENT
Deeds
Deeds
Deeds
Deeds
Deeds
1808-ó9ó
1808-ó95
1684-672
7632-785
7575-667
7575-672
7526-277
0692-æO2
0564-0025
o54r'-O343
0544-0057
os47-o669
Property Related Public Documents
Click here to view PropS!!y lCj¡!ed.¡CþIç_89çCmgn'þ
No data available for thefollowing modules: Buildings, Photos, Sketches.
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