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Home My WebLink AboutEngineer's Report 07.15.05112 Yeh and Associates, Inc. Geotechnical Engineering Consultants 5700 E. Evans Avenue Denver, CO 80222 Tel.: (303) 781-9590 Fax: (303) 781-9583 0170 Mel Ray Road Glenwood Springs, CO 81601 Tel: (970) 384-1500 Fax: (970) 384-1501 July 15, 2005 Project No. 25-106 Mr. Dan Penny Grace Homes, Inc. 786 Valley Court Grand Junction, CO 81505 Subject: Test Pit Observations, 110-116 Angelica Circle 142-144 Angelica Circle, 14-20 Jessica Lane, 15-21 Jessica Lane and 85-91ngelica Circle, Valley View Village, Phase I, Garfield County, Colorado. Reference: HP Geotech, "Preliminary Geotechnical Study, Proposed Roan Cliff Village Development, Parcels 2-5 and 2-6, Battlement Mesa, Garfield County, Colorado", dated September 16, 2002. Dear Mr. Penny: As requested, a representative of Yeh and Associates, Inc. observed backhoe test pits at the subject site to investigate near surface conditions in order to provide recommendations for shallow foundation design and construction. The findings of our investigation and recommendations for construction of residences on the subject lots are presented in this letter. A preliminary geotechnical report was conducted by HP Geotech in 2002, as referenced above. Yeh and Associates, Inc. work was done in accordance with our agreement for geotechnical engineering services for Grace Homes, Inc. dated November 5, 2004. Based on conversations with the client, single-family residences are planned on these lots. We anticipate the foundations will consist of a concrete mat with thickened edges. Basements are not planned for these residences. The lots are rough graded and curb and gutter is installed. Streets were not paved at the time of our investigation. Based on site observations, the lots are near construction grade and fill placement should be negligible, if necessary. We observed excavation of test pits located adjacent to the proposed townhome sites as shown on Figure 1. The soils exposed in test pits TP -2, 4 and 5 consisted of 3 to 4 feet of clay or sand fill underlain by natural clay and sand to the maximum explored depths of approximately 6 to 7 feet. Yeh and Associates observed fill placement in 2003. Soils encountered in test pits TP -1 and 3 consisted of clay and gravel, respectively, to the maximum explored depth of 5 feet. Test pit logs are presented on Figure 2. The sand and gravel classified as SC and GP -GM and clay classified as CL based on the Unified Soil Classification System. Laboratory test results are presented on Figures 3 through 9. Groundwater was not encountered in the excavations and the soils were slightly moist to moist. Based on our investigation, spread footings or a mat foundation constructed on the undisturbed natural soils can be designed for an allowable soil pressure of 1,500 psf for the above Project No. 25-106 referenced units. Soils encountered on adjacent Tots near anticipated foundation level exhibited compression during laboratory testing. Increases in moisture content due to irrigation or other sources could cause hydro -collapse of the subsoils resulting in foundation settlement. Care should be taken to provide drainage away from the residences. Recommendations for surface drainage are presented in the referenced report. Loose, disturbed soils encountered at foundation level should be removed and replaced with compacted fill or the foundation should be extended to undisturbed soils. Other design and construction recommendations presented in the above referenced geotechnical report should be followed. This study was conducted in accordance with generally accepted geotechnical engineering practices in this area at the time the investigation was performed for use by the client for design and construction purposes. The recommendations submitted in this fetter are based on our observations of the subsoils encountered in the test pits and laboratory test results. This study is based on the assumption that soils at other portions of the lot are similar to the conditions encountered in the pits to the depths excavated. The risk of foundation movement may be greater than indicated in this report because of possible variations in the subsurface conditions. Expansive soils may occur on this site. If expansive clays are encountered in building areas, they may need to be removed or the footings designed with a minimum dead load pressure to reduce foundation and slab -on -grade movements. If the conditions encountered in foundation excavations vary from what is described in this report, we should be notified to re-evaluate our recommendations. We recommend on-site observation of excavations and foundation bearing strata by a representative of the geotechnical engineer. Please call if you have any questions. YEH AND ASSOCIATES, INC. 04)9. 5.7'04.;' .7'- :0 35832 Richard D. Johnson, P.E. `;a?lrs/os' Senior Geotechnical Engineer o 9 .,. 5/ONAL�, 2 of 2 85-91 Angelica Cfrde TEST PIT 5 TEST PIT 2 14-20 Jessica Lane 110-118 Angelica Circle TEST PIT 3 ,7' V��i Indicates building not included in this investigation Indicates approximate test pit locations 142-144 Angelica Circle -411F Not to Scale Approximate Test Pit Locations Figure 1 TP -1 10 12 14 16 18 20 24 TP -2 TP -3 TP -4 TP -5 —Ms= -43:7-%- #200= 71 % LL= 29 PL= 19 __PL 1Q. USCS: CL MC= 13 % 8200= 61 % LL= 37 —P[= 't9 P7= 18 USCS: CL - a * 200= 88 % LL= 29 PL= 19 _F iQ USCS: CL --M6=-1 2-%- #200= 49 % LL= 29 PL= 19 _Pia% uscs:sc - ue=$4-96 -- #200= 9.1 % LL= 36 PL= 25 U- SCS: GP -GM -Me= 48.8 #200= 63 % LL= 38 PL= 22 2f=1� USCS: CL -N16. +5 #200= 82 % LL= 28 PL= 20 l _eI=8 USCS: CL tlF -Me- +4 S-%— — — — #200= 45 % LL= 40 PL= 22 2.1= USCS: SC MC= 9.4 % j' #200= 24 % PL= 20 USCS: SC 0 2 4 6 8 10 12 14 16 18 20 22 24 TEST PIT LOGS Valley View Village, Phase! Project No. 25-106 Figure 2 In YEH AND ASSOCIATES, INC. GEOTECHNICAL ENGINEERING CONSULTANTS Project: Valley View Village Project Number: 25-106 Legend for Symbols Used on Test Pit Logs Soil Lithology sandy CLAY (CL) sandy, clay FELL sandy CLAY with gravel clayey, sand FILL Lab Test Abbreviations MC -Moisture Content #200 -Percent Passing #200 Sieve LL -Liquid Limit PL -Plastic Limit PI -Plastic Index USCS-USCS Classification clayey SAND (SC) silty GRAVEL with sand (GP -GM) Percent Passing 100 Sieve Analysis Sieve Opening in Inches U.S. Standard Sieves iHydrometer Analysis Size of Particles in mm 12" 6" 3" 2" 1" 314" 12" 318'• 4 8 10 16 30 40 50 100 200 -I-i.l_I 90 i 80 �E4-....+. ... 4L_�. 70 — .1. �it I ' it _1 t 40 — 30 20 ■ Olin i 4 I_ - .. a —•>E • ■■.t ■■ ■. • ming ingsmoim lingli 111 ■ommeniliMunimm ••• •.i�lllllllllll IME IMI INSII:==■� `iii �� TIE iii NM MM. 1111 ..0 �.._ 10 — MINIMIi■EnEllMl.�.■IG�:: Hamm nip I:: :l.. mmu- i■.0 lir � T it • 4' 1000 100 10 Particle Size (mm) 1 01 0.01 Sieve Size % Passing 311 _ 2%%" - 2" - 1/211 - 111 - 3/ 11 _ �2,1 -, 3/$„ - #4 99 #1O 98 #40 91 #200 71 Gravel (%) 1 LL e 29 Project Name: Valley View Village Sand (%) 28 PL 19 Sample ID: TP -1 Yeh & Associates, Inc. Geotechnical Engineering Consultants Fines (%) 71 PI ! 10 Sample Depth (ft.): 0-2 SIEVE ANALYSIS Sample Description: sandy CLAY (CL) Drawn By: RDJ Checked By: RDJ Project No.: 25-106 Figure No.: 3 Revised 04/27/2004 Percent Passing Sieve Analysis Hydrometer Analysis Sieve Opening in Inches U.S. Standard Sieves Size of Particles in mm 12" 100 — _ -tet. 6" 1" 314" 112" 318" 4 8 10 16 30 40 50 100 200 ill ; I 90- -ri l -I-1- 80 .1 i I -r +-- -- 1 I 1 , :I. r 1--- 70 .4. -4 ,.. ..4 , 1 1- -----71' F --- __+. —tit- - -- .. 60 — C 1- 50-- 40—t r_ 30 20 10 0 11 I 1 1000 100 10 Particle Size (mm) 0 1 0.01 Sieve Size % Passing 3" - 21/2" - 2" - 1 1/2" - 1" - 3/4 „ - /z" 97 3/g" 96 #4 94 #10 91 #40 80 #200 61 Gravel (%) i 6 LL 37 Project Name: Valley View Village Sand (%) 33 PL 19 Sample ID: TP -1 )A Yeh & Associates, Inc. Geotechnical Engineering Consultants Fines (%) 61 PI 18 Sample Depth (ft.): 2-5 SIEVE ANALYSIS Sample Description: sandy CLAY (CL) Drawn By: RDJ Checked By: RDJ Project No.: 25-106 Figure No.: 4 Revised 04/27/2004 Percent Passing 100 90 80 12" 6" 3" 2- 1" 3!4" i12" 318" 4 8 10 16 30 40 50 100 200 D 1 1- 40 40 _ ... _ r._a... i • 30 20 0 1000 t.�. 4:1 _ - t Emu mom LIME ■■NI 100 10 Particle Size (mm) 0 1 0.01 Sieve . Size Sieve Analysis 3" Hydrometer Analysis Sieve Opening in Inches - U.S. Standard Sieves Size of Particles in mm 12" 6" 3" 2- 1" 3!4" i12" 318" 4 8 10 16 30 40 50 100 200 D 1 1- 40 40 _ ... _ r._a... i • 30 20 0 1000 t.�. 4:1 _ - t Emu mom LIME ■■NI 100 10 Particle Size (mm) 0 1 0.01 Sieve . Size Passing 3" - 2%" - 2" - 1 1/2" - 1" - 3/4„ - /2" - #4 100 #10 100 #40 97 #200 88 Gravel (%) 0 LL 29 Project Name: Valley View Village Sand (%) 12 PL 19 Sample ID: TP -2 Yeh & Associates, Inc. Geotechnical Engineering Consultants Fines (%) i 88 P1 10 Sample Depth (ft.): 2-5 SIEVE ANALYSIS Sample Description: silty CLAY (CL) Drawn By: RDJ Checked By: RDJ Project No.: 25-106 Figure No.: 4 Revised 04/27/2004 Percent Passing 100 Sieve Analysis Hydrometer Analysis Sieve Opening in Inches U.S. Standard Sieves Size of Particles in mm 12:• 6" r 314" 112" 3/8" 4 8 10 16 30 40 50 100 200 __ +.- s F ,._, !. i .. i. 90 Hr -, ;,, - F-a..�...1 i. _-_. i .. 7 i k . I i 80 4 - -a- 4 it__ 1 70 -1-.� ] 4- I- E 4.. 50--. . . . -- ... I ' 1 i -F- _, .., .. 1 I 40 t .•"-I--171--- 1 a+7 r 1 —.._ . -_ - -. _--1 -L _.. 30 20 10 0 �J J. 1000 100 10 Particle Size (mm) 01 0.01 Sieve Size % Passing 3" - 2 1/2" - 2" - �2" - 1" - / " - 1/2" 64 3/8u 64 #4 64 #10 64 #40 61 #200 49 Gravel (%) 36 LL 29 Project Name: Valley View Village Sand (%) 16 PL j 19 Sample ID: TP -2 IVA Yeh & Associates, Inc. Geotechnical Engineering Consultants Fines (%) 49 P1 10 Sample Depth (ft.): 4-7 SIEVE ANALYSIS Sample Description: clayey SAND (SC) with gravel Drawn By: RDJ Checked By: RDJ Project No.: 25-106 Figure No.: 5 Revised 04/27/2004 Percent Passing 100 12" 6" 3" 2" t" 314" 1/2" 3/6" 4 6 10 16 30 40 50 100 200 90 .-'- I - �.+ 80 70 60 50 40 30 20 10 1 _L_ L — -1 4 a - H 0 _1 1000 100 10 Particle Size (mm) 01 0.01 Sieve Size Sieve Analysis 3" Hydrometer Analysis Sieve Opening in Inches 45 U.S. Standard Sieves Size of Particles in mm 12" 6" 3" 2" t" 314" 1/2" 3/6" 4 6 10 16 30 40 50 100 200 90 .-'- I - �.+ 80 70 60 50 40 30 20 10 1 _L_ L — -1 4 a - H 0 _1 1000 100 10 Particle Size (mm) 01 0.01 Sieve Size Passing 3" - 21/" 45 J 2" - 1 1/2" - 1" 40 3/" 34 1/2 32 3/8" 31 #4 30 #10 27 #40 21 #200 9 Gravel (%) 70 LL 36 Project Name: Valley View Village Sand (%) 21 PL 25 Sample ID: TP -3 Yeh & Associates, Inc. Geotechnical Engineering Consultants Fines (%) Sample Description: 9 PI 1 11 Sample Depth (ft.): 0-5 SIEVE ANALYSIS silty GRAVEL with clay (GP -GM) Drawn By: RDJ Checked By: RDJ Project No.: 25-106 Figure No.: 6 Revised 04/27/2004 Percent Passing 100 12" 5" 3" 2" 1" 314" 1n" 319" - . 1.1. _ i-- . ,,. I . H. I, 90. - •-T---__1 1_� .._-_- --.__ti.-ri��f -__ _3 80 — l +- 4 B 19 16 30 40 50 100 200 + d.i- 1. -, 60 . F , f- - � t .... 4 . _.-t..-.;- -;-I - L -1 4 I_ .--1- _1_ . --f _ 30 .--it -, -Ii ____._.1..--� � �. .. i_..._... 50 40 "7-- 20 10 0 .., _.... ... _ —, 1...---T .. , 1000 100 10 Particle Size (mm) 01 0.01 Sieve Size Sieve Analysis 3" Hydrometer Analysis Sieve Opening in inches - U.S. Standard Sieves Size of Particles in mm 12" 5" 3" 2" 1" 314" 1n" 319" - . 1.1. _ i-- . ,,. I . H. I, 90. - •-T---__1 1_� .._-_- --.__ti.-ri��f -__ _3 80 — l +- 4 B 19 16 30 40 50 100 200 + d.i- 1. -, 60 . F , f- - � t .... 4 . _.-t..-.;- -;-I - L -1 4 I_ .--1- _1_ . --f _ 30 .--it -, -Ii ____._.1..--� � �. .. i_..._... 50 40 "7-- 20 10 0 .., _.... ... _ —, 1...---T .. , 1000 100 10 Particle Size (mm) 01 0.01 Sieve Size Passing 3" - 2 /f - 2" - 1 1/ " - 1" - 3/4 „ _ 1/2„ _ #4 100 #10 99 #40 95 #200 82 1 Gravel (%) 0 LL 28 Project Name: Valley View Village Sand (%) 18 PL 20 Fines (%) 82 P1 8 Sample ID: Sample Depth (ft.): TP -4 Yeh & Associates, Inc. Geotechnical Engineering Consultants 4-6 SIEVE ANALYSIS Sample Description: sandy CLAY (CL) Drawn By: RDJ Checked By: RDJ Project No.: 25-106 Figure No.: 7 Revised 04/27/2004 Percent Passing 100 90 80 12" 6" 3" 2" 1" 314" 1/2" 318" 4 8 10 16 30 40 50 100 200 3.1 - r- 70 _$ .... t - 60 + �.. . . i_ • 50 + -- T M 1000 100 10 Particle Size (mm) 0 1 0.01 Sieve Size Sieve Analysis 3" Hydrometer Analysis Sieve Opening in Inches 1 U.S. Standard Sieves Size of Particles in mm 12" 6" 3" 2" 1" 314" 1/2" 318" 4 8 10 16 30 40 50 100 200 3.1 - r- 70 _$ .... t - 60 + �.. . . i_ • 50 + -- T M 1000 100 10 Particle Size (mm) 0 1 0.01 Sieve Size Passing 3" - 2 1/2" - 2" 72 1 1/2" - 1" - 3/4„ _ 1/ „ - 3/$„ - #4 69 #10 67 #40 57 #200 45 1 Gravel (%) 31 LL 40 Project Name: Valley View Village Sand (%) 24 PL 22 Sample ID: TP -5 srA Yeh & Associates, Inc. MAN Geotechnical Engineering Consultants Fines (%) 45 PI 18 Sample Depth (ft.): 0-3 SIEVE ANALYSIS Sample Description: clayey SAND with grave (SC) Drawn By: RDJ Checked By: RDJ Project No.: 25-106 Figure No.: 8 Revised 04/27/2004 Percent Passing 100 90 80 70 60 50 40 30 20 10 0 Sieve Analysis Hydrometer Analysis Sieve Opening in Inches U.S. Standard Sieves Size of Particles in mm 12" 6" 3" 2,• 1" 314" 112" 318" 4 8 10 16 30 40 50 100 200 1000 100 10 Particle Size (mm) 01 0.01 Sieve Size % Passing 3" - 2 1" - 2" 55 11/^ 44 1" - 3/4„ - 1/2 ! 44 3/$° 43 #4 43 #10 41 #40 33 #200 24 IN III I I li Oli 1111 II 11 MNMr 1MEM - -ISM IIIIIIMM ■•■■•••••• • —L.--._._4.... _.,_ L. 11 _ ..--- I-- _ SinniMil - • _ • • ""ir•lIM �■ III ■■EMIL ■■■I�■r EM MEN.. IIIIIMENIIIII ow Ns ■r ■ _ 1000 100 10 Particle Size (mm) 01 0.01 Sieve Size % Passing 3" - 2 1" - 2" 55 11/^ 44 1" - 3/4„ - 1/2 ! 44 3/$° 43 #4 43 #10 41 #40 33 #200 24 Gravel (%) 57 LL 35 Project Name: Valley View Village Sand (%) 19 PL 20 Sample ID: TP -5 Yeh & Associates, Inc. Geotechnical Engineering Consultants Fines (%) 24 PI 15 Sample Depth (ft.): 3-6 SIEVE ANALYSIS Sample Description: clayey SAND with grave (SC) Drawn By: RDJ Checked By: RDJ Project No.: 25-106 Figure No.: 9 Revised 04/27/2004 ]� ¥EH & ASSOCIATES, INC Project No: 25-106 Summary of Laboratory Test Results Project Name: Valley View Village, Phase I Sample Location Moisture Content (%) Dry Density (pcf) Grain Size Analysis Atterberg Limits PH Water Soluble Sulfate % Swell (+) / Consoli- dation {-} Unconf. Comp. Strength (psf) R CLASSIFICATION Test Pit Depth (ft) Sample Type Gravel > #4 (%) Sand ° (/O) Fines < #200 (%) LL PL P1 -VALUE AASHTO USCS TP -1 0 - 2 Bulk 13.7 1 28 71 29 19 10 A-4(5) CL 2 - 5 Bulk 13.0 6 33 61 37 19 18 A-6(9) CL TP -2 0 - 4 Bulk 14.5 0 12 88 29 19 10 A-4(8) CL 4 - 7 Bulk 11.2 36 16 49 29 19 10 A-4(2) SC TP -3 0 - 5 Bulk 8.4 70 20 9 36 25 11 A-2-6 GP -GM TP -4 0 - 4 Bulk 18.8 3 34 63 38 22 16 A-6(8) CL 4 - 6 Bulk 15.0 0 18 82 28 20 8 A-4(5) CL TP -5 0 - 3 Bulk 11.5 31 23 45 40 22 18 A-6(5) SC 3 - 6 Bulk 9.4 57 19 24 35 20 15 A-2-6 SC r Rev 2 - 8/02 Page 1 of 1 Jul 03. 2000 7:16AM HP LASERJET FAX 1-0-0 4-0-0 0 0 5-0-0 25-1 -4 1 ROOF PITCH 2 75 1 1N 1-1 11 IlKi OEM 411 IBJ 1111 wrii or 1 1\ II Ai ■■ ■U 1,1, 1 111111111111615111111111 ■11111111 JIMMI■ AMEN PI LIB AIMS ■ IMMO. 11 9 0 `/d tisM1 g-8-8 J 11_6_0 1 1 -11-1 2 ov RIQ!J TRUSS Jul 03 2000 7:56AM HP LASERJET FAX 1' CA fel TlL1`vERE© p\/ R HANG AS 1D FCs F2A FT OAE3LE F' R FLAN HAIVG1-FZ TO BEAM A1sO‘,./E gAY_ 4-- L-1 f=2' E WITH 1JNI`T BE OVERH;1LT TRUSS U tr F-1 Z ROOF P1TCH 2.75 CEILING F71TC1--1 Telephone: rax: L.1.- EY' SET - W\ 1 SEE? WITH UN 1T "A" P. Nome; GRACE HOMES Address: Telephone: Job: �► bvik h6�K min Cp..lu• %IA 1., rr.n1n GH-UNITB 1 Mko• 11 /1RM!1C14 :Vnvn Av.