HomeMy WebLinkAboutFile Documents.1300 Riverside Dr.0309.2017 (8).ARBK H.p,-Ku MAR 5020 County Road 154
Glenwood Springs, CO 81601
Geotechnical Engineering I Engineering Geology Phone: (970)945-7988
Materials Testing I Environmental Fax: (970)945-8454
Email: hpkglenwood@kumarusa.com
Office Locations: Parker, Glenwood Springs, and Silverthorne, Colorado
November 13, 2017
Revised November 16, 2017
S2 Architects
Attn: Joseph Spears
215 South Monarch Street
Aspen, Colorado 81611
(joseph@s2architects.com) Project No. 17-7-501
Subject: Percolation Testing, Lot 6, Block 1, Riverside Subdivision, 1300 Riverside Drive,
Aspen, Colorado
Gentlemen:
As requested, H-P/Kumar performed percolation testing at the subject site on November 7, 2017
for surface water runoff disposal system design. The findings of our subsurface exploration and
percolation test results are presented in this report. The test was performed as additional services
to and in accordance with our proposal for professional engineering services with S2 Architects
dated June 16, 2017.
The percolation test was requested to be performed in a landscape area off Riverside Drive as
shown on Figure 1 to meet City of Aspen requirements. An exploratory boring was drilled down
into the natural silty sand and gravel soils and percolation testing was performed in the
completed borehole, 11 feet deep. We returned to the site on November 15 and deepened the
boring to below the groundwater level. A log of the exploratory boring is presented on Figure 2
and laboratory gradation test results are shown on Figure 3.
The Natural Resources Conservation Service has identified four hydrologic soil groups in the
Aspen area. The project site is located in Type B soil area having a moderate infiltration rate.
Results of percolation testing performed at the test location are summarized in Table 1 and
indicate a rate of about 5 minutes per inch. The groundwater level was encountered at a depth of
161 feet immediately following drilling and when checked the next day, the borehole was dry
and had caved at 13 feet. In our experience, the caved depth is close to the groundwater level.
If you have any questions or need further assistance,please call our office.
Sincerely,
•H-P.KUMAR c• .PA
40
Steven L. Pawlak, P ' I 6 2.2 2
SLP/kac
. . 7//,
Attachments: Figure : ' ''. t, •ratory Borings RECEIVED
Figure 2�`` Off tr 'S- s tory Boring
Figure 3—Gra• . • est Results 12/11/2 017
Table 1 —Percolation Test Results
cc: Woody Creek Engineering—Josh Rice (josh@woodycreekengineering.com) ASPEN
BUILDING DEPARTMENT
LOT 71.99
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i LEGEND:
• BORING FOR CURRENT STUDY.
' 10 0 10 20 0 BORING FOR PREVIOUS STUDY
APPROXIMATE SCALE—FEET DATED 7/5/17. RECE
����
iE
€g 17-7-501 H—P-� MAR LOCATION OF EXPLORATORY BORINGS /111 /2017
ASPEN
BUILDING DEPARTMENT
BORING 2 LEGEND
EL. 8001'
0 ,� ti TOPSOIL; ORGANIC SANDY SILT AND CLAY, DARK BROWN.
a.
- GRAVEL AND SAND (GM-SM); SILTY, SCATTERED
— II 27/12 COBBLES, MEDIUMDENSETODENS , SLIGHTLY MOIST TO
o MOIST WITH DEPTH, LIGHT BROWN.
5 , 26/12 — DRIVE SAMPLE, 2-INCH I.D. CALIFORNIA LINER SAMPLE.
WC=4.0 J
DD=�81 /27 12 DRIVE SAMPLE BLOW COUNT. INDICATES THAT 27 BLOWS OF
—
-200-13 A 140-POUND HAMMER FALLING 30 INCHES WERE REQUIRED
ag0
TO DRIVE THE SAMPLER 12 INCHES.
10 Q DEPTH TO WATER LEVEL AND NUMBER OF DAYS AFTER
w— i
, 35/12 - DRILLING MEASUREMENT WAS MADE.
— PRACTICAL AUGER REFUSAL. WHERE SHOWN ABOVE BOTTOM
-t OF BORING, INDICATES THAT MULTIPLE ATTEMPTS WHERE
a— MADE TO ADVANCE THE HOLE.
w_
o —► DEPTH AT WHICH BORING CAVED WHEN CHECKED ON
15 NOVEMBER 16, 2017.
S °
NOTES
1. THE EXPLORATORY BORING WAS DRILLED ON NOVEMBER 7,
2017 TO 11 FEET THEN DEEPENED TO 25 FEET ON NOVEMBER
20 15, 2017 WITH A 4-INCH DIAMETER CONTINUOUS FLIGHT
POWER AUGER.
— 2. THE LOCATION OF THE EXPLORATORY BORING WAS MEASURED
APPROXIMATELY 3. THE ELEVATOXIMA ION OFBY THEPACING EXPLORATORYFROMFEATURES BORINGSHOWN WAS OBTAINEDONTHE
25
BY INTERPOLATION BETWEEN CONTOURS ON THE SITE PLAN
PROVIDED.
4. THE EXPLORATORY BORING LOCATION AND ELEVATION SHOULD
BE CONSIDERED ACCURATE ONLY TO THE DEGREE IMPLIED BY
THE METHOD USED.
5. THE LINES BETWEEN MATERIALS SHOWN ON THE EXPLORATORY
BORING LOG REPRESENT THE APPROXIMATE BOUNDARIES
BETWEEN MATERIAL TYPES AND THE TRANSITIONS MAY BE
GRADUAL.
6. GROUNDWATER WAS NOT INITIALLY ENCOUNTERED IN THE
BORING AT THE TIME OF DRILLING BUT WAS ENCOUNTERED
WHEN THE BORING WAS DEEPENED. FLUCTUATIONS IN WATER
LEVEL MAY OCCURRED WITH TIME.
7. LABORATORY TEST RESULTS:
WC = WATER CONTENT (%) (ASTM D 2216);
DD = DRY DENSITY (pcf) (ASTM O 2216);
+4 = PERCENTAGE RETAINED ON NO. 4 SIEVE (ASTM D 422);
-200 = PERCENTAGE PASSING NO. 200 SIEVE (ASTM D 1140).
P
PECFVED
17-7-501 H-P--�KUMAR LOG OF EXPLORATORY BORING FiQ. 2
12/11 '2017
ASPEN
BUILDING DEPARTMENT
HYDROMETER ANALYSIS SIEVE ANALYSIS
TINE READINGS U.S.STANDARD SERIES I CLEAR SQUARE OPENINGS
24 HR5 7 HRS
100 45 MIN )5 MIN SWAIN 19MIN 4MIN 1MJN /w0 /1D0 /SO/4a/30 /6 /1016 /4 3/Jf' 3 4' 1 2' �' Tr Q'0
r II
I 1
90
ZiIII
10
BO20
70 30
6040P 250 50
4060
3070
2080
I
10 1 I 90
I
0 I I t I 1 I 1 I I ! till I 1I I I III I I I / I I III 11 I I I I l i i i I 100
.001 .002 .005 .009 .019 .037 .075 .150 .300 I .600 1.18 12.36 4.75 9.5 10 38.1 76.2 127 200
.425 2.0 152
I DIAMETER OF PARTICLES IN MILLIMETERS
CLAY TO SILT SAND GRAVEL
FINE MEDIUM COARSE FINE COARSE COBBLES
GRAVEL 18 X SAND 69 X SILT AND CLAY 13 X
LIQUID LIMIT PLASTICITY INDEX
SAMPLE OF: Silty Sand with Gravel FROM: Boring 2 0 5'
g
1
R
3
1
i
These test results apply only to the
samples which were tested. The
E testing report shall not be reproduced,
n except In full, without the written
Siaieve analysis lasting Iroval of Kumar& MP.so at I
o accordance with ASTM D42j VED
"EE and/or ASTM D1140. ``
4 C
11 17-7-501 H-P-WUMAR GRADATION TEST RESULTS 0 4,/11/2017
ASPEN
BUILDING DEPARTMENT
P [CJMAQ?
TABLE 1
PERCOLATION TEST RESULTS
PROJECT NO. 17-7-501
HOLE NO. HOLE LENGTH OF WATER WATER DROP IN AVERAGE
DEPTH INTERVAL DEPTH AT DEPTH AT WATER PERCOLATION
(INCHES) (MIN) START OF END OF LEVEL RATE
INTERVAL INTERVAL (INCHES) (MAIN./INCH)
(INCHES) (INCHES)
B-2 134 5 41 37 4 1 ---
.3
37 34'/4 2% 1.8
34'/4 32 2%
2.2
32 30'/4 13/4 2.9
301/4 29 1'/4
4
29 273/4 11/4 4
273/4 263/4 1 5
263/4 253/4 1 5
J
- - 253/4 243/4 1 5
Note: The percolation test was conducted in the completed 4-inch diameter borehole
on November 7, 2017.
RECEIVED
12/11/2017
ASPEN
BUILDING DEPARTMENT