HomeMy WebLinkAboutEngineer's Report 11.08.2013November 8, 2013 High Country Engineering, Inc. 1517 Blake Avenue, Suite 101 Glenwood Springs, CO 81601 Attention: Mr. Matt Langhorst, P.E. Subject: Gradation Analysis and Percolation
Testing Pura Vida Ranch Garfield County, Colorado Project No. GS05690.002-145 7 CTLITHOMPSON We visited the site on October 31, 2013 to excavate one profile and two percolation pits
at the approximate locations shown on Figure 1. We also obtained a soil sample from a pit excavated in the area of a new septic system. We performed gradation and hydrometer testing
on the soil sample. Graphic logs of the soils encountered in our pits are shown on Figure 2. The sample tested contained 25 percent gravel and 31 percent sand size particles. The part
of the soil sample with diameters smaller than sand were subjected to hydrometer analysis. Hydrometer analysis determined that the samples contained 40 percent silt and 8 percent clay
size particles. Gradation test results are shown on Figure 3. We also performed percolation testing on the soils encountered in our pits. Percolation testing was performed on the silty
sand soil in P-1, and on the gravel soil in P-2. The pits were presoaked the night before testing. Testing was performed on November 7, 2013. Results of the testing indicated that the
percolation rate for the sand was 8.5 minutes per inch, and the percolation rate for the gravel was 7 minutes per inch. We appreciate the opportunity to work with you on this project.
If you have questions or we can be of further service, please call. 234 Center Drive I Glenwood Springs, Colorado 81601 Telephone: 970-945-2809 Fax: 970-945-7411
Very Truly Yours CTL I THOMPSON, INC. ~Kz/fl-Edward R. White, PE. Project Engineer ERW:cd cc via email toMatt@hceng.com HIGH COUNTRY ENGINEERING, INC. PURA VIDA RANCH PROJECT NO. GS05690.002
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, <tID , SCALE: l' = 30' j .J ; <-fi, "1//' I NOTE: LOCATIONS 0 PERCOLATION F pirROFILE AND APPROXnolATE S ARE HIGHCOUN • pM, VlDA RAN1,I,'!Y ENGINEERING INC rOJect No. GS05690.002'-14~
/Locations of Percolation and Profile Pits Fig. 1
LEGEND: Profile 0 1> ..C.D. .!: 5 -.r. a. CD c 10 Sandy clay "topsoil". organics. moist. brown. Sand. silty. occasional gravel. dense. moist. tan. (Sid) Gravel. clean to slightly silty.
cobbles. dense. moist. brown. rust. (GP-Gt.4) Indicates bulk sample. P-l ~':',': P-2 0 ~':',,: 1:1 , 0 'CtDI :-:+.-5 :; ... Z -+ 10 NOTES: 1. Percolation pits were excavated with a mlnl-trackhae
on October 31. 2013. 2. No free ground water was found In the percolation pIts at the tIme of excavatIon. 3. LocatIons of percolatIon pIts shown on FIgure 1 are approximate. 4. These
percolation pits are subject to the explanations. limitatIons and conclusions as contaIned In thIs report. SUMMARY LOGS OF PERCOLATION PITS Project No. GS05690.002 145 Fig. 2
25HR. 7liR 45 M(N 15 M!t1 lOG TiME READiNGS 6\1 MIN 1'.1 MlN. 4 M N .. MIN. '2(\0 US. STANDARD SERIES r.LEN~ SQUARF. OP('JJINGS '100 '::'0 '4 '3; '.~ '10 '8 '4 :: '~;:~i::E:~!!~~~L:j~~~[].~~;:+F~~Et~
~ ::, .001 0.002 .005 .009 .OHI 037 .074 .149 .2910.425SO 1.19 202.38 'l.76 9.52 19,' 361 76.2 \2~5iOO ,--------------1 DIAMETER OF PARTICLE IN MilliMETERS SANDS CLAY (PlASTIC) TO SIl.T
(NON·PlASTiC) Sample of SAND. SILTY (SM) From P·1 AT 1·3 FEET [ 25 HR. 1 HR. 451.11,'1 151-.11,'1 100 HYDROMETEH ANALYSIS liME READINGS to MIN. 19 MIN. .: M:N 1 MIN Z') ". ·:.F.. ,.
.. ,.,. .., .. .• ,.. . ,.. .,..: L··.··, T·.·., :ii)1 '200 FINE GRAVEL 21 % SILT & CLAY 48 % PLASTICITY INDEX COR8LES SAND liQUID LIMIT 31 % % % ---~ U.S. STANDARD SERIES CLEAR S~UARE
OPENINGS '\00 '50 '40 '30 "16 '10 '0 '4 ,"'. ;~JD.42 .5'i'.' 1.~9 2'3 2:~il 4 ,~, DIAMET£:R OF PARllCLE IN MILLIMETERS 31B" 314" 1 y," T 40 60 ,00 • i" ;00 ',52 ""z' I'";; " ~ z "'"
"w ~ CLAY (PLASTIC) TO SILT (NON.PLASTIC) SANDS GRAVEL ~---CFI~NF.~.----TC~V~.E~O~IU~M---rC~O~A~RS·~---oFI~N~E---T CC~O~A~.R~SEc--r-C~O~BB~I~,F.;iS Sample of From HIGH COUNTRY ENGINEERING,
INC. PURA VIDA RANCH PROJECT NO, 0505690.002·145 S;\GSQS690.00Z\14516. CslcsIGS{}S690,OG2 145 Gradation,xls GRAVEL SILT & CLAY PLASTICITY INDEX % SAND % LIQUID LIMIT Gradation Test Results
I.'/D % % FIG.3