HomeMy WebLinkAboutLot 19• TESTING
• EXPLORATION • CHEMICAL
0 MATERIALS 0 INSPECTION
4040 "B" Street
• Anchorage, Alaska
99503
Mr. John J. Huot
c/o DOWL Engineers
800 Cordova Street
Anchorage, Alaska 99501
ALIMA T[m1ti
October 28, 1974
W.O. #17097
ATTENTION: Mr. Tom Garrod
SUBJECT: Soils Investigation
LOCATION: Lot 19, U.S. Survey 3200 - DOWL W.O. #7812
Gentlemen:
279-2581
Transmitted herein are the results of the subsurface investigation performed
on the subject property on October 19, 1974. Exploration consisted of two
test holes drilled by Denali Drilling, Inc., employing a Truck mounted,
Mobile B-50 drill, fitted with a 6" continuous flight auger. Grab samples .
were taken at 5.0' intervals, by pulling the auger out of the test hole and
removing the sample from the flights of the auger from near the bit. The
soils were visually classified in the field in accordance with Sheets 2
through 4, following the text. The field classification was supplemented by
laboratory review of samples based on the same criteria. The drilling was
supervised and the test holes were logged by B.D. Kenworthy, technician, of
our staff.
The data is organized in this report as follows:
Test Hole Location Sketch
Typical Soils Group (This Study)
Test Hole Logs
Grain Size Distribution Curve
Standard Explanatory Data
Excerpts from GAAB and State
Regulations
DISCUSSION
Figure 1
Table A
Table B
Sheet 1
Sheets 2 to 4
Appendix A
The Greater Anchorage Area Borough has established the amount of seepage
area per bedroom required for a particular seepage pit based on the unified
Classification of the soil. We understand this criteria to be asfollows:
---continued---
Mr. John J. Huot
Page 2
October 28, 1974
Unified Soils Classification Seepage Area Required
GW -GP 85 ft.2/bedroom
GM 225 ft.2/bedroom
SW 125 ft.2/bedroom
SP 150 ft.2/bedroom
SM 250 ft.2/bedroom
ML 275 ft.2/bedroom
CL -CH 350 ft.2/bedroom
Soils with a seepage area value of greater than 250 ft.2/bedroom are gen-
erally considered not sufficiently permeable to accept effluent. Addition-
ally, the bottom of any seepage pit is required by State regulations to be
4 feet above the free water level.
The primary intent of this field effort was directed to the determination of
the unified soils classification of the soils encountered. To this end, the
soil samples were visually classified in the laboratory and grouped according
to their textural properties. The predominant group, and the soil generally
encountered at the depth of interest was a silty gravelly sand (SM), Group A.
A description of the various groups as well as their unified classification
is contained in Table A. The distribution of the groups, the unified soils
classification of each soil encountered and the observed free water level are
.contained in the test hole logs. Information further identifying the major
soil group encountered in this study is given in the grain size distribution
curve (Sheet 1) which immediately follows the hole logs.
We trust this is sufficient for your immediate needs. Please feel free to
call the writer should any questions arise or should we be of further service
as the project develops.
Very truly yours,
ALASKA TESTLAB
John M. Lambe
JML/vms
Enclosures
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TABLE A
TYPICAL SOILS GROUP (THIS STUDY ONLY)
UNIFIED
FROST SOIL
GROUP CLASS DESCRIPTION CLASSIFICATION REMARKS
.A F-2 Silty Gravelly Sand SM See Sheet
1 for Grain
Size Distribution
Curve
F-4 Gravelly Sandy Silt
ML Fill Material
F-1 Silty Sandy Gravel GM
4-
TABLE B
Test Hole 1 W.O. #17097
Elevation: Existing Ground
Depth in Feet
From To Soil Description
0.0' 2.5' F-1, brown, silty sandy gravel with many cobbles, damp,
medium density, 6"-, GM
2.5' I3.0' F-2, brown, silty gravelly sand with many cobbles, damp,
high density, 1-1/2"-, SM
Bottom of Test Hole: 13.0'
Frost Line: None Observed
Free Water Level: None Observed
Sample Depth
1 5.0'
2 10.0'
• 3 13.0'
Blows/6"
Type of Dry
M% Sample Strength Group
6.5 G L -N A
7.0 G L -N A
7.0 G M A*
Remarks: 1. Type of Sample, G = Grab
2. Dry Strength: N = None, L = Low, M = Medium, H - High
3. Group refers to similar material, this study only
4. Drilling refusal at 13.0'
"5. Slightly larger silt fraction 10.0' to 13.0'
6.. Date of Exploration: October 19, 1974
TA5LL s
Test Hole 2 W.O. #17097'
Elevation: Existing Ground
Depth in Feet
From To Sbil Description
0.0' 7.0' F-4, red -brown, gravelly sandy silt (fill), ML
7.0' 20.0' F-2, brown, silty gravelly sand with layer of silty
sandy ;ravel at 15.0', many cobbles, damp, high density,
SM
Bottom of Test Hole:
Frost Line:
Free Water Level:
Sample Depth
1 5.0'
2 10.0'
3 15.0'
4 20.0'
20.0'
None Observed
16.0'
Blows/6"
Type of Dry
M% Sample Strength Group
23.4 G L -N C
8.2 G N A
6.0 G N D
14.1 G M -L A
Remarks: 1. Type of Sample, G = Grab
2. Dry Strength: N = None, L = Low, M = Medium, H = High
3. Group refers to similar material, this study only
4. Date of Exploration: October 19, 1974
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