HomeMy WebLinkAboutObservation of Basement Level Subgrade 05.28.18H.PVKUMAR
Geotechnical Engineering I Engineering Geology
Materials Testing I Environmenlal
. 5020 County Road 154
Glenwood Springs, CO 81601
Phone: {970) 945-7988
Fax: (970) 945-8454
Email: hpkglenwood@kumarusa.com
Ofäce Locations: Denver {HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, Summit County, Colorado
May 28, 2018
RM Construction
Attn: Blake Piland
5030 County Road 154
Glenwood Springs, Colorado 81601
blake @buildwithrm.com Project No. l7-7-236.4
Subject: Observation of Basement Level Subgrade, Proposed Sageser Residence, Lot 80,
konbridge, 1102 River Bend Way, Garfield County, Coloraclo
Gentlemen:
As requested, we have evaluated the basement level subgrade exposed in the excavation for
suitability to support the floor slab. The evaluation was performed in accordance wirh our
agreenrent for professional se¡vices with RM Construction dated May 3,2A18. We previously
conducted a subsoil study for design offoundations at the site and plesented our findings in a
repCIn dated April 5,2A17, Project No. 17-7-236.
The basement floor is proposed to be conventional slab-on-gratle construction. We had
recommended in the previous report to sub-excavate the compressible silt and clay soils down 2
feet and teplace thetn compacted to help reduce the settlement potential of the slab mainly if the
bearing soils are wetted. Additional testing of the silt ancl clay soils at subgrade level, results
presented on Figure I and in Table 1, confinn the compressibility potential of the natural soils.
The depth of compressibie soils is around 6 to I feet. Based CIn this depth, we expect at least 1
inch of slab settlement if the subgrade soils are wetted. If the risk of settlement and distress is
acceptable, the sub-excavation and compaction can be eliminated. The north part of the
basement slab area has already beeu replaced compacted. The remaining subgrade area as a
minimum will need to be moistened to near optimum and compacted to at least 95Vo of standard
Proctor density.
If you have any questions or need further assistance, please call our office.
Sincerely,
H-P\ KUMAR
Steven L. Pawiak,
SLP/kac
Attachments: Figure Test Results
Table I - S of Laboratory Test Results
I
0
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ADDITIONAL COMPRESSION
UNDER CONSTANT PRESSURE
DUE TO WETTINc
-6
-7
*8
-9
t,0
SAIYIPLE OF: Sondy Silt ond Cloy
FROM: Lower Level Subgrode S/1A/18
WC = 8.6 ?(, DÐ = 96 pcf
17 -7 -236.A H-PryKU]VIAR SWELL-CONSOLIDATION TEST RTSULTS Fig. 1
M-r*KUIVII\KTABLÊ 1SUMMARY OF LABORATORY TEST RESULTSProject No. 17-7-236.4sorL cRBEDROCKTYPËSandy Silt and ClaySandy Silt and ClaySandy Silt and ClayTTERBERGPERCENTPASSINGNO.200S¡EVELIQUIDLIMITFLASTICINDEXUNCONFINEDCOMPRËSSIVESTRENGTH72NATURALMOISTURECONTÊNTNATURALDRYDENSITYGRAVËLSAND(%)(%\9I98963.15.08.5SAMPLE LOCATIONBOTTOM OF LOWËRLEVELMiddleNortheastNorthwest
Proctor
Lab No.
Depth or
Elev.
Field Dry
Density
(pc0
Field
Moisture
Content
o/o
Field
Comp
(Yo)
Min.
Comp
Req.
(o/o\
Test
No.
Location
10.6 96 95 057-t8subgrade103.91
10'southeast of northwest corner
of building
057-18subgrade{04.3 10.9
Lab No.
96 952
Method Description
25 southeast of northwest corner
of bu
Max. Ðry
Dens.
opt.
Moist.
siltv clav with sand r08.3 15.3057-t8 ASTM D 698
H-P*KUMAR 5020 County Road 154
Glenwood Springs, CO 81601
Phone: (970) 945-7988
Fax (970) 945-8454
Email: hokqlenwood@kumarusa.com
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Office Locations: Parker, Glenwood Springs, and Silverthorne, Colorado
Client:
Earthwork Gompaction Testing Report
RM Construction Project No.: 17-7-236.4' Day:
Attn: Blake Piland Date:
5030 County Road 154 Page:
Glenwood Springs, Golorado 81602
Monday
5t21t18lofl
Project:Observation of Drilled Piers and Gonstruction Observation and Testing, Proposed Residence,
l{02 River Bend , Garfield Cou , Colorado
Weather: Partly cloudy, light wind, dry Temperature:82o al4:40 pm
Earthwork Contractor: Rllll Construction
Equipment Used:
Description of Earthwork
Tested:
Sample(s) Obtained:
Verbal Communication:
trackhoe, walk behind roller, jumping jack tamper
Underslab backfillwas tested with acceptable results. The tested area was
reportedly sub-excavated 2 feet and replaced compacted in lifts.
Brian with Rll[ Construction was informed.
Placement and Compaction Procedure: Not observed by H-PlKumar
Lift Thickness:
Compactor(s) Used:
Max. Rock Size Moisture
Conditioning:
Number of Passes
Nuclear e Moisture/Dens Test Resulb
Proctor Sam Reference:
THIS REPORT
COMPACTIVE
WE HAVE RELIED THE
EFFORT AND MOISTURE TO FILI DURING THE TIMÊS WHEN OUR OESERVER OBSERVING OPERATIONS
THE NUCLEAR DENSOMETÊR METHOD OF TESTING WAS USEO IN SUBSTANTIAL ACCORDANCE WITH ASTM D 6938.
Distribution:
RM Construction - Blake Piland (þle¡e@bgjlgqlthrm.com)
Hill Builders, lnc. - Nathan Moffatt@)
Thomas Westhoff Steven L. Pawlak, P.E.
lkac Field Technician Reviewed By
COMPACTION TEST REPORT
108.7
108.2
(J
o.;'ı
L
c,E
¿-o
147.7
1A7.2
'106.7 ZAVfor
SP.G. =
2.47
106.2
16
Water content, %
Tesi specification: ASTM D 698-12 Method A Standard
\
l
/\
/\
/I/\
/
/
//
Elevl
Depth
Classification Nat.
Moist.sp.G LL PI
o/o >
#4
o/o <
No.200USCSAASHTO
CL.ML A-4(5)26 4 89
TEST RESULTS MATERIAL DESCRIPTION
Maximum dry density: 108.3 pcf
Optimum moisture : 15.3 %
Silty Clay ìvith Sand
Project No. 17-7-236.A Client: RM Construction
Project: I102 River Bend Way, Garfield County, Colorado
Location: On Site Sam Number:057-18
& Associates, lnc.
Colorado
Remarks:
See Figure lA for classification results.
ure I
Tested By:KO Checked By :SLPILE
Particle Size Distribution Report
c oaocoTo
@FFNItlÈtt*
I
É.tuz
lJ.
Fzt!t
O
É.tlj
90
80
70
EO
50
40
30
2A
10
o-
GRAIN SIZE - mm
Jtll\
I
I
il
Yo +3*% Gravel % Sand % Fines
Coarse Fine Coarse Med¡um Fine sitt Clay
0 0 0 0 0 1t 89
(no specifi cation provided)
Location: On Site
Sample Number: 057-18 Date:511812018
SIEVE
slzE
PERCENT
FINER
sPEC.*
PERCENT
PASS?
(X=NO)
#30
#50
#100
#200
100
99
97
89
Material Description
Silty CIay with Sand
PL= l9
Atterberg Limits
LL= 26 Pl= 4
GoefficientsPas= P6o=P3q= Pts=UU= UC=
Classification
AASHTO= A-4(5)
Don= 0.0824
Bi3=
USCS= CL-ML
Remarks
See Figure 1 for standard Proctor compaction results.
Kumar & Associates, lnc.
Glenwood Springs, Colorado
Client: RM Construction
Project: I102 River Bend Way, Garfìeld County, Colorado
No: t7-7-236.A
:KOTested By Checked By:SLP/IF
H.PNKUMAR
Ëeotechnical Engineering I Engineering Geology
Materials Testing I Environmental
5020 County Road 154
Glenwood Springs, C0 S1601
Phone: {970) 94S-79SS
_ Fax: (970) 94S-84S4
Email: hpkglenwood@kumarusa.com
Office Locations: Denver {HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, Summit County, Colorado
May 31, 2018
RM Construction
Attn: Blake Piland
5030 County Road 154
Glenwood Springs, Colorado 81601
(blake @buildwithrm.com)
Project No. 17-7-236.4
Subject:observation of Drilled Pie¡ Installation, proposed Residence, Lot g0, konbridge,
1102 River Bend Way, Garfield County, Colorado
Gentlemen:
As requested, a representative of H-P/Kumar observed the drilled pier installations at the subject
site betweeri May 14 and 18, 2018 for suitability to support rhe building foundation. The
findings of our observations are presented in this report. The observations were performed in
acco¡dance with our agreement for professional services with RM Construction dated May 3,
201 8.
The foundation is designed to be supported on forty-eight drilled piers of 24-inch diameter. The
pier location plan is shown on Figure 1. our observations of the pier hole drilling are presented
in the attached Drilled Pier Observation Reports. The pier holes were observed to have
penetrated the alluvial fan deposits and adequately embedded into the underlying river gravel
deposit. Due to potential caving of the gravel, the practical driliing limit was 1 to 2 feet into the
deposit' but temporary casing was used to limit caving and achieve greater penetration depth.
Based on the previous st¡bsurface exploration and our current observations at the site, the
installed piers appear adequate to suppof the recommended design values. Some of the pier
holes were around one foot or less short of the recommended 10 feet minimum total depth
because the river gravel penetration depth far exceeded the minimum specified depth of one foot.
The findings submitted in this letter are based on our observation of the pier hole drilling, our
experience in the area and the previous subsurface exploration at the site. Variations in the
subsurface conditions below the piers could increase the risk of foundation movement. Our
services do not include determining the presence, prevention or possibility of mold or other
RM Constmction
May 31,2018
Page2
biological contaminants (MOBC) developing in the ftiture. ffthe client is concerned about
MOBC, then a professional in this special field of practice should be consulted.
If you have any questions or need further assistance, please call our office.
Sincerely
H-P* KUMAR
Steven L. Pawlak, P.E.
slP/ljf
Attachments: Figure 1- Locations of Drilled pier Holes
Drilled pier observation Reports, May 14 thro'gh May rg, 201g
â &x.ftre
H-P*g¡¡y¡q¡
Project No. 17-7-236.4
Fig. 1LOCÂTIONS OF DRILTTD PITR HOLTStoT 80, tRoNSRt0cEKumar & Associates':.. ';-+48' r.,''' ..-t^-*--**--*r'*-,-.*.-*.,,40'.:.....ì'..Á5ia23957å{$i?Ì¡4-*.,:! j1r,rI,ËW¡F:?,scÁtË-a¿et'11'tð3@:*.!:ÉzD".,;i.l2E0ri *i' l" -. . .,... ¡JOJSI1S1 7-7-236.Ä
CommentHole caved at9Y2'Not acceptedPlumb(Top ofHole)WaterTop ofPierElev.5938.8',GroundElev.5939.9'VariationOver/Under0Depthln Gravel1',ln Overburdenl0'TotalHoleDepth11',PierDia"24"Pier No.Location1H-P*KUMAR",.._ji;ï,i#:åå1ïåiphone: (970) g4S_79S8Fax; (970) 945-8454Email: hpkolenwood@kumarusa.comoffice Locations: Parker, Glenwood springs, and silverthorne, coloradoDRILLED PIER OBSERVATION REPORTClient:Attn:Project:GeneralContractor:RM ConstructionBlake Piland5030 County Road iS4Glenwood Springs, Golorado g1602ProposedProject No. 17-7-236.ADay:Date:Sheet:Rig Type: TruckMonday05-14-18l of IK, P.E.Residence, 1102 River Bend Way, Garfield County, ColoradoRM GonstructionDrillingContractor:Penley DrillingField Notes: AtI piers drilled with 24',diameter auger.Distribution:RM Construction * Blake. piland lblake@buildwíthrm,çom)Louis EllerField EngineerSteven L. PawlaReviewed ByAtr
H-P*KUMAR5020 County Road 154Gtenwood Spdngs, CO 91601phone: (970) 945-79SSFax: (970) 945-8454Email: ryOffìce Locations: Parker, Glenwood Springs, and Silverthorne, CoforadoDRILLED PIER OBSERVATION REPORTClient:Attn:GeneralContractor:RM ConstructionBlake Piland5030 County Road 154Glenwood Springs, Colorado 81602Project No. 17-7-236.A Day:Date:Sheet:Tuesday05-15-181at2P.E.Project Proposed Residence, r10z River Bend way, Garfietd county, coloradoRM ConstructionField Notes: Allpiers drilledwith 24" diameterauger. *Short pierDrillingContractor:Penley DrillingRig Type: Truckaccepted.Distribution:RM Construction - Btake piland (blaketôbuildwithrm.com)llJfLouis EllerField EngineerSteven L. Pawlak.Reviewed ByCommentcasedcasedcasedcasedGased,I'long piercasedcasedcasedcasedcasedPlumb(Top ofHole)plumbplumbplumbplumbplumbplumbplumbplumbplumbplumbWaterdrydrydrydrydrydrydrydrydrydryTop ofPierElev.5938.8'5938.8'5939'5939'5935',5938.8'5938.8',5938.8',5938.8'5938.8'GroundElev.5939.9'5938.8'5938.8'5938.9'5938.8',5938.9'5938.8'5938.8'5938.9'5939.9'VariationOver/Under0000* -l'00000Depthln Gravel1',1',1',1',3'2',1',1'1',1',ln Overburdenl0'gY2'gYz'109'8',1AY2'9Y2tl0'9'TotalHoleDepth11'1OY2'1ïYz'11',12',l0'11Y"'10Y2'11',l0'PierDia.24"24"24"24"24"24"24"24"24"24"Pier No.Location1234n567I910
H-P*KUMARDRILLED PIER OBSERVATION REPORTRM ConstructionBlake Piland5030 County Road 154Glenwood Springs, Golorado g1602Ploiect:Proposed Residence,llOZ River Bend Way, Garfield County, Golorado5020 County Road .t54Glenwood Springs, CO 81601Phone: (970) 945-798SFax: (970) 94S-84S4Email : hokolenwood@kumarusa.æmoffice Locations: Parker, Grenwood springs, and sirverthorne, cororadoGlient:Attn:GeneralContractor:RM ConstructionField Notes:Allpiers drilted with24" diameter auger.Distribution:RM Construction - Blake piland (blake@buildwithrm.com)Project No. 17-7-256.A Day:Date:Sheet:DrillingContractor:Penley DrillingRig Type: TruckSteven L. PawlaReviewed ByTuesday05-15-182ai2K, P.E.Louis EllerField EngineerrytCommentcasedcasedcasedcasedPlumb(Top ofHole)plumbplumbplumbplumbWaterdrydrydrydryTop ofPierElev.5938.9'5943.5'5938.9'5938.9'GroundElev.5938.8'5939.9'5939.9'5939.9'VariationOver/Under0000Depthln Gravel5'z',2'5'ln Overburden5'I'I'5',TotalHoleDepthl0'l0n10'10'PierDia.24"24'24"24"Pier No.Location11121314
H-PtlruMAR5020 County Road 154Glenwood Springs, CO 91601phone: (970) 94S-798SFax (970) 945-A454omce Locat¡ons: parker, o,""*"jîl;-mDRILLED PIER OBSERVATION REPORTClient:Attn:RM ConstructionBlake Piland5030 County Road 154Glenwood Springs, Colorado 91602Project: Proposed Residence, 11A2GeneralContractor:River Bend Way, Garfield County, ColoradoDrillingContractor:Penley Drillingpier aceepted.Louis EllerField EngineerProject No. 17-7-236.A Day:Date:Sheet:Rig Type: TruckWednesday05-16-181 ol2RM GonstructionFNotes: All piers drilled with 24"diameter auger. nshortDistributionRM Construction - Blake piland(blake@buildwithrm.com )ill'fSteven L. Pawlak, p.E.Reviewed ByCommentcasedcasedcasedcasedcasedBoulder atboftomcasedcasedcasedcasedPlumb(Top ofHole)plumbplumbplumbplumbplumbplumbplumbplumbplumbplumbWaterdrydrydrydrydrydrydrydrydrydryTop ofPierElev.5938.8'5938.8'5938.8'5938.9'5935'5935'5943.55938.8'5938.5's938.5'GroundElev.5938.8'5938.9'5938.9'5938.8'5938.8'5938.8'5939.8'5938.8'5938.8',5939.5'VariationOver/Under0+Yz'00n -1'n -1Yzt0000Depthln Gravel4',3y,,3'3',5.8'5.2'2't,1',1ln Overburden6'7',7',7',7',7',I'7t11'11'TotalHoleDepth10'10Yz'l0'10'12.8'12.2'l0'10'1z',12'PierDia.24"24"24"24"24"24"%,,fi"24"24"Pier No.Locatíon,l5l61718*19*2021222324
H-P*KUMAR5020 County Road 154Gtenwood Springs, CO 91601phone: (970) 945_79S8Fax: (970) 945-8454Email: hokqlenwood@kumarusa.comoffìce Locations; Parker, Glenwood springs, and silverthorne, coloradoDRILLED PIER OBSERVATION REPORTClient:Attn:Rllll ConstructionBlake Piland5030 County Road 1S4Glenwood Springs, Colorado gl602Project No. 17-7-2g6.A Day:Date:$heet:Wednesday05-t6-182of2Projeet: Proposed R,esidence,llOZ River BendGeneralContractor:RM ConstructionField Notes: Attpiers drilledwith 24" diameter auger.Distribution:RM Construction - Blake piland fblake@þgildwithrm.com)rytWay, Garfield County, ColoradoDrillingContractor:Penley DrillingRig Type: TruckLouis EllerSteven L. PawlaP.E.Field EngíneerReviewed ByCommentcasedcasedcasedcasedcasedPlumb(Top ofHole)plumbplumbplumbplumbplumbWaterdrydrydrydrydryïop ofPierElev.5938.8'5938.8'5939.9'5938.9'5938.8'GroundElev.5939.9'5938.8'5938.8'5939.9'5938.9'VariationOver/Under0(,000Depthln Gravel1',1',z',2',3',ln Overburden11',10'8'I'7',TotalHoleDepth1z',11',10'10,l0'PierDia.24"24"24"24"24"Pier No.Loeation2526272829
H-P*KUMAROffice LocationsDRILLED PIER OBSERVATION REPORT5020 County Road 154Glenwood Springs, CO 81601Phone: (970) 94S-798SFax: (970) 945-8454Email: hokqfenwood@kumarusa.Parker, Glenwood Springs, and Silverthorne, ColoradoClient:Attn:RM ConstructionBlake Piland5030 County Road 154Glenwood Springs, Colorado 8i602Project No. 17-7-236.A Day:Date:Sheet:ounty, ColoradoPenley DrillingRig Type: TruckLouis EllerSteven L. PawlaThursday05-r7-181 al2Project: Proposed Residence,ll0? River Bend Way, Garfield GGeneralContractor:RM GonstructionField Notes: Ail piers drilled with 24diameterDrillingContractor:auger. *Short pier acceptedDistribution:RM Construction - Blake piland @)t\'fCommentcasedcasedcasedcasedcasedcasedcasedcasedcasedcasedPlumb{Top ofHole)plumbplumbplumbplumbplumbplumbplumbplumbplumbplumbWaterdrydrydrydrydrydrydrydrydrydryTop ofPienElev.5938.8'5935'5935'5935',5934.5'5935'5935'5934.5'5935'5934.5'GroundElev.5938.8'5938.8'5938.9'5938.8'5938.8'5938.8'5938.8'5938.8'5939.9'5938.3VariationOver/Under0n -0.1'* -0.5'0* -1'* -0.8,* -0.9'* -1t* -0.5'* -1',Depthln Gravel1',3.7',5.5'6',4.2',44',4.2'4.3',4.2'ln Overburden11'l0'I'8'ot9',I'9',I'9'TotalHoleDepth12',13.7'13.5'14',13.2'l3'l3'13.2'f 3.3'13.2'PierDia.24"24"24"24"24"24"24"24"24"24"Pier No.Location30n3l"3233*34*35*36*37*38*39Field EngineerReviewed Byk, P.E.
H-P*KUMAR5020 County Road 1S4Glenwood Springs, CO 91601phone: (970) 945-79SSFax; (970) 945-8454hokolenwood(ôkumarusa.comOffice Locations: Parker, Glenwood Springs, and Silverthorne, ColoradoDRILLED PIER OBSERVATION REPORTClient:Attn:RM ConstructionBlake Piland5030 County Road i54Glenwood Springs, Colorado 91602Project No. 17-T-296.A Day:Date:$heet:Count¡r, ColoradoPenley DrillingThursday05-17-182of2Project: Proposed Residence, 1102 River Bend way, GarfierdGeneralContractor:RM ConstructionField Notes: Allpiers drilled with24" diameter auger.Distribution:RM Construction - Blake piland (blak@buildwithrm.com)DrillingContractor:Rig Type: TruckLouis EllerSteven L.PawlaP.E.Field EngineerReviewed ByntfCommentcasedcasedP(Top ofHole)plumbplumbWaterdrydryTop ofPierElev.5943.5'5943.5'GroundElev.5943.5'5943.5'VariationOver/Under00Depthln Gravel1',1tln Overburden15'l5'TotalHoleDepth16'16PierDia.24"24"Pier No.Location4041
H-P*KUMAR5020 County Road 154Glenwood Springs, C0 91601Phone: (970) 945-7988Fax: (970) 945-8454Email: hpkolenwood@kumarusa.comOffice Localions; Parker, Glenwood Springs, and Silverthorne, ColoradoDRILLED PIER OBSERVATION REPORTClient:Attn:RM ConstructionBlake Piland5030 County Road 154Glenwood Springs, Colorado 91602Project No. 17-7-236.ADay:Date:Sheet:Friday05-18-18l of 1Project: Proposed Residence, l,,loz River Bend way, Garfield counþ, coloradoGeneralContractor:RM ConstructionDrillingContractor:Penley DrillingRig Type: TruckField Notes: Atlpiers drilled with24" diameter auger.Distribution:RM Construction - Blake piland lþlake@bqildrryithrm*com)Louis EllerSteven L. Pawlak, P.EField ËngineerReviewed ByGommentcasedcasedcasedcasedcasedcasedcasedPlumb(Top ofHole)plumbplumbplumbplumbplumbplumbplumbWaterdrydrydrydrydrydrydryTop ofPierElev.5943.5'5943.5'5943.5'5943.5'5943.5'5943.5',5943.5'GroundElev.5943.5'5943.5'5943.5'5943.5'5943.5'5943.5'5943.5'VariationOver/Under0000000Depthln Gravel11'1',,1,1',11',ln Overburden1'',15Y2'15Y2'14',14Yz'l6'14'TotalHoleDepth16',161/,',1614',1'',1sIz'17'15'PierDia.24"24"24"24"24"24"24"Pier No.Location4243u45464748iltr