HomeMy WebLinkAboutFile Documents.110 Coach Rd.0079.2018 (39).ARBK H-p Ku MAR 5020 County Road 154
Glenwood Springs,CO 81601
Geotechnical Engineering J Engineering Geology Phone: (970)945-7988
Materials Testing Environmental Fax: (970)945-8454
Email: hpkglenwood@kumarusa.cam
Office Locations: Parker,Glenwood Springs,and Silverlhome, Colorado
February 26, 2018
Revised July 3, 2018
Oyster Shores, LLC
400 East Main Street
As en Colorad
Project No. 18-7-153
Subject: Percolation Testing, Lot 7, Double Bar X Ranch, Coach Road,Aspen, Colorado
Gentlemen:
As requested, H-P/Kumar performed percolation testing at the subject site on February 23, 2018
for surface water runoff system design. The findings of our subsurface exploration and
percolation testing are presented in this report. The percolation test was performed according to
our agreement for professional services with Oyster Shores, LLC dated February 7, 2018.
The percolation test was requested to be performed at a proposed drywell near the northwest
corner of the building envelope as shown on Figure 1 to meet City of Aspen requirements. An
exploratory boring was drilled down into the natural silty clayey sandy gravel and cobble soils
and percolation testing was performed in the completed borehole. A log of the exploratory
boring is shown on Figures 2.
Results of percolation testing performed at the boring location are summarized in Table 1 and
indicate a rate of about 5 minutes per inch. The groundwater level and bedrock in this area are
generally known to be relatively deep and should not adversely impact the drywell design.
If you have any questions or need further assistance, please call our office.
Sincerely,
H—P; KUMAR NA-. qj7,7tc? • • 1,Y
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Steven L. Pawlak, P.E.
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Attachments: Figure 1 - Location ofiE.xpl:ratory Boring
Figure 2 - Log of Exploratory Boring
Table 1 - Percolation Test Results
cc: Zone 4 Architects- Jeff McCollum(imccollum(a?zone4architects.com)
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LOT 7, BAR X RANCH
LEGEND:
elBORING FOR CURRENT STUDY.
$ 0 BORING FOR PREVIOUS STUDY BY
HP GEOTECH JOB No. 109110A
DATED MAY 22, 2009.
30 0 30 60
j APPROXIMATE SCALE-FEET
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.11 18-7-153 H-P WUMAR LOCATION OF EXPLORATORY BORING Fig. 1
BORING 1 LEGEND
EL. 7776'
-tea
TOPSOIL; ORGANIC SANDY SILT AND CLAY WITH GRAVEL.
0 POSSIBLE FILL SOILS.
• ••• GRAVEL (GM—GC); SILTY, CLAYEY, SANDY, COBBLES, POSSIBLE
r — BOULDERS, DENSE, MOIST, RED—BROWN.
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36 11
5 • / DRIVE SAMPLE, 1 3/B—INCH I.D. SPLIT SPOON STANDARD
PENETRATION TEST.
w� ' +
36/12 DRIVE SAMPLE BLOW COUNT. INDICATES THAT 36 BLOWS OF
A 140—POUND HAMMER FAWNG 30 INCHES WERE REQUIRED
TO DRIVE THE SAMPLER 12 INCHES.
50/5
10
NOTES
I. THE EXPLORATORY BORING WAS DRILLED ON FEBRUARY 23, 2018
WITH A 4—INCH DIAMETER CONTINUOUS FLIGHT POWER AUGER.
2. THE LOCATION OF THE EXPLORATORY BORING WAS MEASURED
APPROXIMATELY BY PACING FROM FEATURES SHOWN ON THE
SITE PLAN PROVIDED.
3. THE ELEVATION OF THE EXPLORATORY BORING WAS OBTAINED
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 ENCOUNTERED IN THE BORING AT THE
TIME OF DRILLING.
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18-7-153 H-P <UMAR LOG OF EXPLORATORY BORING Fig. 2
H- P1<UMAR
TABLE 1
PERCOLATION TEST RESULTS
PROJECT NO. 18-7-153
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) (MIN./INCH)
(INCHES) (INCHES)
B-4 120 5 32'/z 29 31/2 1.4
29 271/2 11/2 3.3
271/2 26 1'/z 3.3
26 25 1 5
25 231/2 1'/z 3.3
231/2 22% 1 5
Note: The percolation test was conducted in the completed 4-inch diameter borehole
on February 23, 2018.