HomeMy WebLinkAboutPROSPECT HEIGHTS J.M. Lambe & Associates
SOIL AND MATERIALS
ENGINEERING
AND TESTING
John M. Lambe, P.E.
April 24, 1981
4101 Arctic Boulevard · Suite 205 ,, Anchorage, Alaska 99503
907-276-4113
Alaska Land Development Services, Inc.
4546 Business Park Blvd.
Anchorage, Alaska 99503
Attention: Mr. Steven Brown
Subject: Soils Investigation - Prospect Heights Subdivision
Dear Mr. Brown,
This letter presents the results of the soils investigation that we per-
formed on the 70 acre parcel bounded by Kasilof Hills Subdivision, Prospect
Heights Subdivision and Chugiak State Park..This work was performed in accor-
dance with our proposal dated March 17, 1981. This report supercedes all pre-
vious transmittals.
In response to your request, nine borings were performed on the subject
property. The borings were drilled by Denali Drilling, Inc. with a Nodwell
mounted, Mobile B-50 drill fitted with 6" O.D. continuous flight auger. The
borings were located by reference to the preliminary topographic information
that you provided. The site is fairly steep and access, even with the Nodwell,
was difficult. As directed, the borings were located where access allowed
without damage to significant trees. The approximate locations of the borings
are shown on the Boring Locati~on Sketch attached as Plate 1. The borings were
logged by Mr. Roy McDonald, technician of our staff. Mr. McDonald's field logs
were provided to you on April 24, 1981, as requested.
Samples were taken in each boring at intervals of five feet by removing
the auger from the boring then removing the sample.from the flights of the auger
from near the bit. The samples were sealed in plastic bags and transported to
our laboratory where the moisture content of each sample was determined. The
samples were visually classified by a laboratory technician, then sorted into
groups according to similarities in color and texture. Each group was assigned
an arbitrary letter designation. Selected samples of the group were. analyzed
for particle size distribution. The distribution of the samples within the
groups and the schedule of particle size analyses are as follows:
1
I
!
1
1
GROUP
A
B
C
E
F
G
"BORING
1
6
1
1
2
2
3
3
3
4
4
4
8
9
2
9
6
7
9
4
4
1
5
7
7
7
7
8
8
8
PROSPECT HEIGHTS
DEPTH
5.0'*
7.0'*
10.0'
5.0'
7.0'
10.0'
15.0'*
6.0'
8.5'
5.0'
7.5'
3.0'
10.0'*
5.0'
7.0'
20.0'
5.0'
15.0'
20.0'
3.0'
10.0'
14.0'
2.5'
5.0'
3.0'*
5.0'
7.0'
10.0'*
7.5'
10.0'*
15.0'
20.0'
15.0'
3.0'
3.5'*
7,0'
10.0'*
15.0'
18.0'
5.0'
7.5'
10.0'
page 2
Ak. Land Development Svcs.
Prospect Heights
CLASSIFICATION
SILTY SANDY GRAVEL, GM
SILTY SAND, SM
SILTY SANDY GRAVEL, GM to
SILTY GRAVELLY SAND, SM
SILTY SAND, SM
SILTY SAND, SM
SILTY SAND, SM
SILTY SAND, SM
SILTY SAND, SM
SILTY GRAVELLY ~AND, SM
GROUP
J
*Particle Size
BORING DEPTH
i 13.0'
8 15.0'
8 20.0'
9 18.0'*
Analyses Performed
:~age 3
Ak. Land Development Services
Prospect Heights
CLASSIFICATION
SILTY SAND, SM
The field logs were modified by the laboratory analyses. The flights of
the auger used by Denali Drilling, Inc. were worn smaller than the bit of the
auger. This, coupled with the method of sampling, may not have returned all
of the coarse fractions of the soil matrix to the surface for sampling and
analysis. Consequently, the interpretation of the lab and field data is biased
toward the field observations with regard to gravel content. Due to the glacial
origin of the soils, cobbles and boulders can be expected to occur frequently
throughout the area. The logs of the borings are presented as Plates 2 through
9. The results of the particle size analyses are presented on Plates 10 through
19. A1 field and laboratory classification were performed according to the
Textural Classification System presented on Plate 20 and the Unified Soils Classi-
fication System presented on Plate 21.
In addition to logging and analyses of the soil types encountered in our
exploration, percolation testing was performed adjacent to each boring in the
seemingly most likely strata for the development of on-si~e sewer systems as
dictated by soils, free water or bedrock. The percolation test procedure was
to drill a shallow percolation test hole to the desired depth approximately
five to ten feet away from the test boring, placing gravel in the bottom of
the percolation hole then placing four inch perforated pipe in the hole. Gravel
was then placed around the perforated pipe and the pipe was filled with water.
The soils were allowed to saturate overnight then Mr. Mark Hall of our staff
monitored the drop in the water level within the percolation hole over a period
of one to four hours on the following day. Water was added to the percolation
test as required to try to maintain six inches of water over the gravel in the
bottom of the percolation hole. The results of Mr. Hall's percolation testing
are attached as Plates 22 and 23.
All borings were left open. When Mr. Mark Hall viewed each boring subsequent
to drilling, observations to the depth of the free water level, if any, were re-
corded. These data are presented on the boring logs and on the field percolation
test results presented on Plates 23 and 23. The wording "no free water observed
above 5'7"" means that the boring sloughed below 5'7" and the hole appeared dry.
Page 4
Ak. Land Development Service~
Prospect Heights
This subdivision is influenced by numerous factors. The soils were generally
silty sandy gravel to silty sand. This agrees well with the Generalized Geologic
Map prepared by Schmoll and Dobrovolny which maps the area generally as morainal
deposits marking the margins of former glaciers. The east'boundary of the site
is mapped as colluvium. With the exception of Borings 3,4 & 6, the remaining
soils tested appeared to percolate. Locating these borings by survey methods
and plotting them on the topographic map of the area may indicate a topographic,
i.e. drainage:,related explanation for these boring's poor percolation rate.
Free water was observed in Boring 1 at 5'5", Boring 8 at 7'10" and Boring 9
at 12'10". No free water was observed in the remaining borings during drilling
or to the depth to which the boring remained open subsequent to drilling. It
should be noted however, tha~t
annually in response to seasonal run-off or he~rain~f_a~l~ The data presented
on our logs is only intended to represent the level of the free water observed
in the borings at the time of the observations.
Shallow bedrock is assumed in Boring i at 11½ to 13' Boring 2 at 14½ to 15',
Boring 5 a~.?~, Boring 7 at 18' and Boring 9 at 17'. However, the drilling often
got very difficult above refusal to drilling at which depth competent bedrock was
assumed. This difficult drilling is noted on the logs and may represent a weathered
bedrock zone above the assumed depth of more competent rock.
This report is intended to be a preliminary transmittal of the field observa-
tions and soils analyses that were performed on the subject property. The scope
of this effort was determined by discussing the project with Mr. Steve Brown of
Alaska Land Development Services and Mr. Les Buchholz of the Department of Health
and Environmental Protection (DHEP). As we discussed, the purpose of this in-
vestigation was to provide preliminary data with which to assess the suitability
of the property for subdivision and the development of on-site sewer systems and
to define areas where additional analyses may be required. To this end, rigorous
field percolation testing was performed. We trust the foregoing is sufficient to
'your immediate needs. While intended to be comprehensive, it may not be exhaustive
of the possibilities. If questions arise or if we can be of further service, please
feel free to call.
Very Truly Yours,
John M. Lambe, P.E.
Civil Engineer 4254-E
TEST HOLE LOCATION DIAGRAM
PROSPECT HEIGHTS SUBDIVISION
/
T.H. 8
T.H. 2
N
· PLATE
TEST HOLES HOT LOCATED
BY SUI~VEY METHODS
TEST HOLE; LOCATION DIAGRAM
PROSPECT HEIGHTS SUBDIVISION
r.H.G
T.H. 4
r.H. 9
-- ' .... ' PLATE
HO{-£S NOT LOCATED 1
TEST
BY SURVEY METHODS
Laboratory Tesl~
Percolation Test 2.5 - 3.0'
Sieve Analysis 14.6% - #200
H 27.2
A 13.6
Sieve Analysis 31.0% - #200 B 16.1
Percolation Test 5.5 - 6.0'
B 9.9 10-
J 15.2
D 11.8
C 8.6 5
C 5.9
15.
LOG OF BORING 1
Equipment 6" O.D. CONTINUOUS FLIGHT AUG[
Elevation Exi~¢inq Grn~.Date .4/17/81
-- Brown, PEAT, PT
wet
Brown SILTY GRAVELLY SAND, SM
wet
Brown SILTY SANDY GRAVEL, GM
wet, brown & dark brown mottling
Black SILTY SAND, SM to SILTY
GRAVELLY SAND, SM
drills very stiff, may be
weathered bedrock.
REFUSAL @ 11.5,13.0 & 13.5' Assume
Bedrock
-- Grey GRAVELLY SANDY SILT, ML ........ ~,~
saturated, very dense drilling, may
be weathered bedrock.
TOTAL DEPTH OF BORING - 13.0' 7
Free Water Observed @ 5'5" on
April 20, 1981
_LOG OF BORING 2
Equipment 6" O.D. CONTINUOUS FLIGHT AUGEF
Elevation ExistinQ Grnd.Date 4/17/81
Brown SILT, ML
w/fibrous organics, wet
Seasonal Frost to 1.5'
Brown SILTY SANDY GRAVEL, GM to
SILTY GRAVELLY SAND, SM
Sieve Analysis 33.9% - #200 D 6.1 10
D 5.5
REFUSAL @ 14.5 & 15.0' Assume Bedrock
TOTAL DEPTH OF BORING - 15.0'
No Free Water Observed, Boring
Sloughed Below 10.0'
JOHN M LAMBE P.E.
LOG OF BORINGS i & 2 PLATE
ALASKA LAND DEVELOPMENT SERVICES
PROSPECT HEIGHTS SUBD. 2
ANCHORAGE,
JobNo. 81-274.10 /kaf~: WEP Date 4/24/81
Loborofory Tests
E
LOG .OF BORING 3
Equipment 6" O.D.CONTINUOUS FLIGHTAUGE
ElevotionExisting Grnd. Dote 4/17/81
Brown PEAT, PT
Seasonal Frost to 1.0'
Percolation Test 5.5 - 6.0'
D 12.3
D 10.9
Brown SILTY SANDY GRAVEL, GM to
SILTY GRAVELLY SAND, SM
moist to wet
C 6.5
Sieve Analysis 28.4% - #200 C 7.2
15_
D 9.3
30-
JOHN M. LAtABE, P.E.
4C
Brown SILTY GRAVELLY SAND, SM
moist
TOTAL DEPTH OF BORING -20.0'
No Free Water Observed, Boring
Sloughed Below 15.0'
LOG OF BORING 3
ALASKA LAND DEVELOPMENT SERVI. CES
PROSPECT HEIGHTS SUBD.
ANCHORAGE~ ALASKA
PLATE
3
~No. 81-274.10 Appr:WEP Date 4/24/81
Percolation Test 4'10" to D 9.0
5'5"
F 12.1
Sieve Analysis 41.6% - #200 F 12.1
LOG .OF
BORING 4
Equipment 6" O.D.CONTINUOUS FLIGHT AUGEI
ElevatlonExistinq Grnd. Date 4/~7/81
PEAT, PT
3rown SANDY SILT, ML
saturated
Seasonal Frost to 1.0'
Brown SILTY GRAVELLY SAND, SM
moist
Brown, SILTY SAND,.SM to
SANDY SILT, ML
moist
D 8.8 15.
Brown SILTY GRAVELLY SAND, SM
moist w/cobbles below 17.5'
D 7.9
__ TOTAL DEPTH OF BORING - 20.0'
NO Free Water Observed, Boring
Sloughed Below 14.0'
JOHN M. LAMBE, P.E.
No. 81-274.10 At)pr: WEP .Date 4/24/81
LOG OF B ORING 4
A L A S-~ N ~'--~E ~ ~--S-~R V ICES
PROSPECT HEIGHTS SUBD. ALASKA
NCHORAGE?
PLATE
4
La~ratory TesH ~ ~
Percolation Test 2.0 - 3.0'
Sieve Analysis 37% - #200 H 26.4
C 7.4
C 7.0
LOG .OF BORING 5
Equipment 6" O.D.CONTINUOUS FLIGHT AUGE~
ElevatlonExistinq Grnd. Date 4/18/81
Brown PEAT, PT
Brown SILTY SAND, SM
wet
Brown StTLY SANDY GRAVEL, GM
w/frequent cobbles, moist
--REFUSAL @ 9.5' & 9.8' Assume Bedrock
No Free Water Observed, Boring
Sloughed Below 5.5'
JOHN M. LAtABE,
Job No. 81-274.10
2/24/81
LOG OF BORING 5
ALASKA LAND DEVELOPMENT SERVICES
PROSPECT HEIGHTS SUBD.
iNCHORAGE, ALASKA
PLATE
5
La~:x:)ro for y Tests
Percolation Test 4.0-4.5'
Sieve Analysis 42% - #200
A
G
G
G
G
11.1
8.7
10.1
11.1
8.8
10.2
15.
LOG .OF BORING 6
Equipment6" O.D.CONTINUOUS FLIGHT AUGEi
Elevati°nExisting Grnd.Date 4/18/81
Brown PEAT, PT
Brown SILTY SANDY GRAVEL, GM
moist
Brown SILTY GRAVELLY SAND, SM
moist
Brown SILTY SAND, SM
moist, w/gravelly layers
Dark Brown GRAVELLY SANDY SILT, ML
moist, very tight drilling, may be
weathered bedYock
TOTAL DEPTH OF BORING - 20.0~
No Free Water Observed, Boring
Sloughed Below 15.0'
3~
JOHN M. LAMBE,
Job No. ~1-274.10
Appr: WEP Date 4/24/81
LOG OF BORING 6
ALASICA LAND DEVELOPMENT SERVICES
PROSPECT HEIGHTS SUBD.
A~CHORAGE ALASKA
PLATE
6
Laboratory Tests
LOG .OF BORING 7
Equipment 6"0. D. CONTINUOUS FL [GHT AUGE.R
ElevatlonExistinq Grnd. Date 4/18/81
Brown PEAT, PT
Sieve Analysis 20% - #200
Percolation Test 2.5-5.0'
E 13.3
C 8.7
I 3.4
Sieve Analysis 16.7% - #200 I 3.1 10.
Brown SILTY SAND, SM
moist
BrOwn SILTY SANDY GRAVEL, GM to
SILTY GRAVELLY SAND, SM
w/ numerous cobbles
Drilling becoming very tight w/less
cobbles @ 10.0'
I 4.3 15_
7.4
Dark Brown SILTY GRAVELLY SAND, SM
moist,very dense drilling @ 16.0'
may be weathered bedrock.
REFUSAL AT 18.0'.
No Free Water Observed, Boring
Sloughed Below 13.5'
3O-
JOltN M. LAN BE, P.E.
40-
LOG OF BORING 7 PLATE
ALASKA LAND DEVELOPMENT SERVICES
PROSPECT HEIGHTS SUBD.'=~r'
Job No. 81-274.10 ANCHORAGE, ALASKA
La~oratory Tests
LOG .OF BORING 8
Equipment6" O.D.CONTINUOUS FLIGHT AUGEI
ElevaHonExistinq Grnd. Date 4/18/81
PEAT, PT
Percolation Test 1'5'!-2'10" D 21.0
I 4.3
I 5.3
5
Brown SILTY GRAVELLY SAND,
moist to saturated
SM
I 4.9 10,
Drilling tight below 11.0'
J 16.4
15_
J(~o No
J 15.1
30-
JOHN M. LAMBE, EE.
81-274.10 Appr: WEP D~te
4O-
4/24/81
--TOTAL DEPTH OF BORING - 20.0'
Free Water Observed @ 5.5' while
drilling, 7!10' after drilling 4/21/81
LOG OF BORING8
PLATE
ALASKA
ALASKA LAND DEVELOPMENT SERVI.CES
PROSPECT HEIGHTS SUBD. ~
~aboratory Tes~
LOG .OF BORING 8
Equipment 6'~' O.D.CONTINUOUS FLIGHT AUG.EF
Elevat~onExistina Grnd. Date 4/18/81
rown PEAT, PT
Percolation Test 1'5'!-2'10"
D 21.0
I 4.3
I 5.3
5
rown SILTY GRAVELLY SAN~
saturated
I 4.9 10.
Drilling tight.below 11.0'
j 16.4 15-
J 15.1
JOHN M. LAt BE, P.E.
Job No.__81-274'i'0
__ TOTAL DEPTH OF BORING - 20.0'
Free Water Observed @ 5.5' while
drilling, 7~10' after drilling 4/21/81
30
ApDr: WEeP Date~
'LOG OF BORING8
ALASKA LAND DEVELOPMENT SERVI.CES
PROSPECT HEIGHTS SUBD.
ALASKA
PLATE
8
Laboratory Tests
Percolation Test 4'5"-5.0
D 9.3
E 6.8
~
LOG ,OF BORING 9
Equ;pment6. O.D.CONTINUOUS FLIGHT AUGE
Elevati°nExistinq Grnd.Date 4/18/81
Brown PEAT, PT
Brown SILTY SANDY GRAVEL, GM to
SILTY GRAVELLY SAND, SM
moist to wet
C 9.5
D 6.7
Brown SILTY SAND, SM
wet to saturated w/cobbles & boulders
G 4.1
Sieve Analysis 30.4% - #200 J 14.0
15_
Boulder or Bedrock @ 17.0'
Grey SILTY SAND, SM
very dense drilling, may be weathered
bedrock
Free Water Observed @ 12'10" 4/22/81
JOHN M. LAN BE, P.E.
3c~oNo. fi1~774.10 Al:~r: WFP Date_4/24/81
LOG OF BORING 9 PLATE
ALASKA LAND DEVELOPMENT SERVI. CES
PROSPECT HEIGHTS SUBD.
ANCHORAGE. ALASY~q
y Tests
D 9.3
Percolation Test 4'5"-5.0' E 6.8
C 9.5
D 6.7
LOG .OF BORING g
Equipment6" O,D.CONTINUOUS FLIGHT AUGE
ElevatlonExisting Grnd. Date 4/18/81
Brown PEAT, PT
Brown SILTY SANDY GRA~ZF~GM to
SILTY GRAVELLY SA~D, SM~
m~ist to_~t ~
Brown SILTY SAN , SD~
wet to saturated w/cobbles & boulders
G 4.1
Sieve Analysis 30.4% - #200 J 14.0
15
20.
3O-
4~
JOHN M. LAMBE; P.E.
JobNo R1 .~74.10 Appr: w_~5..P__ Date 4/24/81
Boulder or Bedrock @ 17.0'
Grey SILTY SAND, SM
very dense drilling, may be weathered
bedrock
Free Water Observed @ 12'10" 4/22/81
LOG OF BORING 9
Tv L6T YE VICES
PROSPECT HEIGHTS .SUBD. '
ANCHORAGE? ALASKA
PLATE
U. S. Stondord Sieve Opening Size J U.S.Slandord Sieve Numbers I 'Hydrometer
'*Jlltl ~ ~'rl~l ''11'111 '' "11II
""'
I
IIitl IIIII
,olllll
G~AIN SIZ~ IN MIlLIMeTerS
J ~RAVEL COARS* SAND
COBBLES COARSE J FINE MEDIUM J FINE SILT OE CLAY
SymbolSomple Source Classificotion
BORING [, Samp3e ~ ~ 5.0' SILTY SANDY GRAVEL, GM
PARTICLE SIZE ANALYSIS PLATE
JOHN M. LAMBE P.E. , ALAS~ LAND DEVELOP~]ENT SERVICES
~No 81-274.10 Appr: WEP Date 4/24/81 ~NCHORAGE, ALASKA
U. S. Stondord Sieve Opening Size I U.S.Stondard Sieve Numbers J 'Hydrometer
"""" """' ""Ill,Ill
,lll, ,,,,Ill .
r/ llll ,,,,,,
t 0.5 OI 005 OOI 000~
GR~IN SIZE IN MILLIMETERS
COBBLES GRAVEL I SAND
COARSE J FINE COARS~ MEDIUM 'J FINE SILT OR CLAY
SymbolSomple Source Clossificolion
BORING 1, Sample ~3 ~ 7.0' SILTY SAND, SM
PARTICLE SIZE ANALYSIS PLATE
JOHN
-,v,. LA,BE P.E. ALAS~ LAND DEVELOPMENT SERVICES --
~No. 81-274.10 Appr: WEP Date 4/24/81 ANCHORAGEPROSPECT, HEIGHTS SUBD. ALAS~ //
U. S. Stondard Sieve Opening Size I U.S.Stondard Sieve Numbers J 'Hydrometer
'U~111~1111' ~i' ri I r ' ' ' 'l I' ' ' ' IIIIIII I
Jllllll I ~1111111 I IIIIIII I IIIIII IIIIII I
"'"" '
~o111 III II1~11 I' II
IIIIIIII IIII1~1 ~ II/I-
~o I I I ~ III IIIIIII
IIIIlll I IIIIII I I~, IIIIII
~ IIIIIIII
GRAIN SIZE IN MILLIMETERS
COBBLES COARSE I FINE COARS~ MEDIUM ~ FINE SILT OR CLAY
Symbol 5omple Source ¢lassificotion
BORING 2, Sample ~4 ~ 10.0' SILTY SAND, SM
PARTICLE SIZE ANALYSIS PLATE
JOHN M. LAMBE P.E.
ALAS~ LA~ ~[VELO~[~T S[~VZC[S 12
PROSPECT H[[GHTS SUBD.
~No. 81-274.]0 Appr:~EP Date 4/24/8~ ANCHORAGE~ ALA5~
U. S. Standard Sieve~. ~.Opening Size I U.S.Stondnrd Sieve Numbers I 'Hydrometer
4 3 2,./72,1 ~'4 i. Y2~8 4 810 16 2030405060 100 200270
0.~ O'l 005 OOI 0005 O001
GRAIN SIZE IN MILLIMETERS
COBBLES COARSE I FINE COARSE~ MEDIUM j FINE SiLT OE CLAY
Symbol Sample Source Classification
BORING 3, Sample #4 @ 15.0' SILTY GRAVELLY SAND, SH
PARTICLE SIZE ANALYSIS PLATE
JOHN M. LAMBE P.E. ALAS~ LAND DEVELOPNENT SERVICES --
13
~No. 81-Z74.10 Appr: ~EP Date 4/24/81 , ANCHORAGE~ ALASKA
0.5 OI 005 001 0005 000
GRAIN SIZE IN MILLIMETERS
SAND
GRAVEL COARSE~ MEDIUM J FINE
COBBLESI COARSE I F,NE t S,LT OR CLAY
SymbolSomple Source CIossificolion
BORING 4, Sample #3 @ 10.0' SILTY SAND, SM
PARTICLE SIZE ANALYSIS PLATE
JOHN A4. [AA4BE P.E.
ALASKA LAND DEVELOPMENT SERVICES
PROSPECT ,RIG,TS SUB°. 14
J(93No. B1-274.10 Appr: WFP Date 4/24/B1 _ ),NCHORAGE, ALASKA
U. S. Sfondord Sieve Opening Size U.S.Stondord Sieve Numbers /00 ?00 ~'~0ydrOmetet
~llllll I Ill~l Illllll IIIIIIII
,o,,,,,, ,,,,,, ,,,,,,,
IIIIIII1' IIIIIII I ~1 IIIIIII
Illllill Illllll I IIII1~
IlIJiii'
~oll ,11~Jl I I~I '~ III IIIIIlll Ill
GRAIN SIZE IN MILLIMETERS
SAND
GRAVEL ~COARS~ MEDIUM J FINE
Symbol Somple Source Closslficotion
BORING 5, Sample ~1 ~ 3.5' SILTY SAND, SM
PARTICLE SIZE ANALYSIS PLATE
JOHN ~. [A~E P.E.
ALAS~ LAND DEVELOPMENT SERVICES
PROSPECT HEIGHTS SUBD.
~No. 81-274.10 Ap~: WEP Date 4/24/81 ANCHO~GE, ALAS~
U S. Slondord Sieve Opening Size J U.S.Sfenderd Sieve Numbers I 'Hydrom~fer
"'"" """
OOI 0005
GRAIN SIZE IN MILLIMETERS
COBSL[S COARSE J FINE COARS~ ~[DIUM J F~N/ SILT OR CLAY
Symbol Somple Source Clossification
BOEING 6, Semp]e ~4 ~ ~0.0' SILTY SAND, SH
PARTICLE SIZE ANALYSIS PLATE
PROSPECT HEIGHTS SUBD.
~No. 81-274.10 Appr: WEP .Date 4/24/81 ANCHORAGE, ALAS~
U'S. StandardSieveOpeningSize J U.S.Sfandord SieYe Numbers I 'Hydromefer
I0 16 2030405060 ~ 200270
,o,,,,, ,,,,il II
GRAIN SIZE IN MILLIMETERS
COBBLES COARSE I FINE COARSE~ MEDIUM J FINE SILT 0,~ CLAY
Symbol Somple Source Clossificolion
BORING ?, Sample #! @ 3.0' SILTY SAND, SH
PARTICLE SIZE ANALYSIS PLATE
JOHN M. LAMBE P.E.
ALASI~ LAND DEVELOPHENT SERVICES
PROSPECT HEIGHTS SUBD. 17
Job No._81-274.10 Appr:WEP Date 4/24/81 ANCHORAGE,. ALASKA
U. S. Standord Sieve Opening Size I U.S.Sfandord Sieve Numbers I 'Hydrometer
5 I 0.5 OI 005 001 0005 0~
GRAIN SIZE IN MILLIMETERS
GRAVEL
I
SAND
]COARS~ MEDIUM I FINE
COBBLESI COARSE , F,NE I SILT OR CLAY
Symbol Somple Source Clossificollon
BORING 7, Sample ~4 e 10.0' S[LTY GRAVELLY SAND, S~
PARTICLE SIZE ANALYSIS PLATE
JOHN ~. lA'BE P.E.
ALAS~ LAND DEVELOPHENT SERVICES ~0
mu
PROSPECT HEIGHTS SU~D.
~No 81-274.10 Appr~EP Date4/24/81 ANCHORAGE, ALAS~
U. S. Stondard Sieve Opening Size J U.S.Sfandard Sieve Numbers I 'Hydrometer
~ I 0.5 OI 005 001 0005 0~1
G~AIN SIZE IN MILLIMETERS
I GEAV[L COARS~ SAND 1
COBBLES COARSE J FINE M[DIUM J FINE SILT OR CLAY
Symbol Somple Source Clossificalion
BORING 9 ~ IS.O' SILTY SAND, SH
PARTICLE SIZE ANALYSIS PLATE
JOHN M. lAMBE RE.
ALAS~ LAND D[VELOPH[NT SERVICES
PROSPECT HEIGHTS SUBD. l=
~No, 81-274.10 Appr:WEP Date 4/24/81 ANCHORAGE~ ALAS~
John M. Lambe, P.E. 4101 Arctic Boulevard · Suite 205 · Anchoraee. Alaska99503_
SOIL CLASSIFICATION CHAR T
OR
\
OR\ CLAY
SOIL AND MATERIALS
ENGINEERING
AND TESTING
907-276-4113
CLAYEY
\
CLA3
'OR
SAND
SI LTY
~xGR
'GRAVELLY \
20 30 40 50 60 70 80 90
GRAVEL (-ffl:4SCREEN) % BY WEIGHT
CORPS OF ENGINEERS FROST DESIGN SOIL CLASSIFICATION
AND USCS EQUIVALENT GROUPING'
IuO
F1 Gravelly soils 3 to 10 GW, GP. GW-GM, GP-GM
F2 (a) Gravelly ~oil~ 10 Io 20 GM, GW~GM. GP-GM
(b) Sands 3 to 15 SW. SP, SM. SW-SM, SP-SM
~ (a) Gravelly ~s ~20 GM, GC
(b) Sands, except vc~ fine ~ 15 SM. ~
silty ~nfls ~
(c) Cla~.PI~ 12 ~ C~CH
F4 (a) All sil~ -- M~ MH
(b) Ve~ fine s~ty ~n~ ~15 SM PLATE
(c) Clays, PI < 12 -- CL CL-ML ~
(d) Va~ cla~ a~ ~ CL ~nd ML;
ZU
' other fine-g~in~, C~ M~ and SM;
MAdOR DIVISIONS _...l TYFqCAL NAMES
~ ~ ~ILTS AND CLAY~ IN~GANIC C~ OF t~ ~ ~O]~ P~Cl~,
UNIFIED SOIL CLASSIFICATION SYSTEM
320 (2600)
320 (2600)
2750 (2000)
470
2000
700
KEY TO TEST DATA
dob No.
JOHN M LAMBE P.E.
Appr:__ Date
SOIL
CLASSIFI(~ATION CHART
AND
KEY TO TE~iT DATA
PLATE
21
BORING DATE
PERCOLATION TEST RESULTS
TIME DEPTH TO
WATER
COMMENTS
I 4/20/81
2 4/20/81
3 4/20/81
4 4/22/81
5 4/21/81
9:30 3~5¼"
9:33 21-¼"
11:56 35-¼"
12:03 20-½"
12:33 23;¼"
1:03 25"
1:33 28"
Free Water Level 5'5"
Test @ 2.5 - 3.0'
Percolation hole dry after
overnight saturation period
Refill Percolation test
2-3/4" Drop/30 minutes
2-3/4" Drop/30 minutes
3" Drop/~s
Percolation Rate -(~11 minut_~e~'
9:47 58"
12:18 72"
12:20 54-½"
12:47 63-½"
1:12 70"
1:14 56"
1:17 57"
1:47 66"
9' ¼"
No Free Water Observed Above 9~
Test @ 5.5 - 6.0.'
10:04 64"
1:58 64"
No Free Water Obse[ved Above
Test@5'4" to 6'-5/8"
10:24 66~½''
10:54 66-½"
11:24 66-½"
No Free Water Observed Above 14'2"
Test @ 4'10½" to 5'5"
Added Water
Added Water
+9" Drop/30 minutes
Percolation Rate - 3 minutes/inch
Water in Percolation hole on
arrival ~
No Apparent Drop
Water in Percolation hole on
arrival
No Apparent Drop
3:30 18½"
4:00 25-1/8"
4:29 28"
4:30 16"
5:07 25-7/8"
5:30 28"
6:00 31"
6:30 33½"
7:00 35-3/4"
7:30 38"
~o Free Water Observed Above~'7"
Test @ 2.0 - 3.0'
Added Water
3" Drop/30 minutes
2½" Drop/30 minutes
2¼" Drop/30 minutes
2¼" Drop/30 minutes
Percolation Rate_13 minutes/_in_~h
PLATE
· - 22
BORING
DATE
4/21/81
PERCOLATION TEST RESULTS
TIME
DEPTH TO
WATER
COMMENTS
2:18 59½"
9
2:48 59½"
3:08 59½"
No Free Water Observed Above 14'10"
Test @ 4to4½' Below Surface
No Apparent Drop
4/21/81
9:56 37
10:26 41-3/4"
10:56 46
10:58 33½"
11:56 43½"
11:58 33
12:56 41½"
1:26 45
1:56 48~'
No Free Water Observed Above 13'4"
Test @ 2.5 to 5.0'
. Added Water
Added Water
3½" Drop/30 minutes
3½" Drop/30 minutes
Percolation Rate-9 minutes/inch
4/21/81 9:43 30-3/4"
10:t3 34½"
10:43 40½"
11:43 45½"
11:45 28
12:43 31
1:13 31-7/8"
1:43 32~"
Free Water Observed @ 7'10"
Test @ 1.5
Added Water
3" Drop/30 minutes
7/8" Drop/30 minutes*
3/8" Drop/30 minutes*
Percolation Rate - 48 minutes/inch*
to 2'10" Below Surface *Average Last Two Readings
4/22/81
9i00 47-3/4"
9:30 50"
10:00 51-3/4"
10:03 43"
12:00 54"
12:30 56-3/4"
1:00 58¼"
Free Water Observed @ 12't0"
Test @ 4'6" to 4'9z''
Added Water
2-3/4" Drop/30 minutes
1½' Drop/30 minutes
Percolation Rate - 20 minutes/inch
PLATE
23
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