HomeMy WebLinkAboutSPRING FOREST S-5757
MEMOaANDUM
DATE: January 7, 1983
'10: Jerry Weaver, Planning Division
FROM: John Lynn, Environmental Specialist
SUBJECT: Spring Forest Subdivision y7 ~7
The Department has reviewed additional soil test and percolation
data. The three soil logs and percolation indicate dense soil
with percolation rates of 48 m/in 40 m/in 38 m/in.
The lots of this size in Spring Forest Subdivision will support
on site septic.
John Lynn
Environmental Specialist
91.010 (5/78)
SOILS LOG
MUNICIPALITY OF ANCHORAGE
DEPARTMENT OF HEALTH AND ENVIRONMENTAL PROTECTION
82E L. Street, Anchorage, Alaska 99501 264-4720
SOILS LOG- PERCOLATION TEST
PERCOLATION
TEST
PERFORMED FOR:
.7
9
10
11
12
5
6
DATE PERFORMED:
13
14
15
16
17
18
19
2O
WAS GROUND WATER $
ENCOUNTERED? N O L
0
P
E
IF YES, AT WHAT
DEPTH?
ubd{visio < r A')
SITE PLAN
Gross Net Depth to Net
Reading Date Time Time Water Drop
H'.4O ~ '/~ s/g
~: JO q'/4~ ~ .5/8
Z: IO ~ ~t8 5/B
PERCOLATION RATE '~l ~ (minutes/inch)
I'EST RUN BEI'WEEN "~' ~ ,, FT AND ~';'~P'~ FT
COMMENTS
PERFORMED BY:
CERTIFIEDEY: ~'~
DATE:
72.008 (6/79)
~OIL~ LOG
MUNICIPALITY OF ANCHORAGE
OEPARTMENT OF HEALTtJ AN[) ENVII1ONMENTAL PROTECTION
· ~ [. St~'eel, Anchorage, Alaska 99501 264-4720
· ~OILS LOG - PERCOLATION TEST
PERCOLATION
'fEST
I~ERFORMED FOR:. _~"O.'
LEGAL DESCRIPTION:
!
2
.3
4
5
6
.7
8
9
i0'-
11----
12
13-
14-
15-
16-
17-'
18---
19-
20-
COMMENTS
P£RFORMED
DATE ~ERFORMED: '~c~ ~'~.SJf- IZI3O/~?.
'Subd;vislom
SITE PLAN
WAS GROUND WATER
ENCOUNTERED?
IF YES. AT WHAT
DEPTH?
' Gross Ne~ Depth to Net
Reading Date Time Time Water Drop
(minutes/inch)
No, 4113.E
C( r,l'lll F, [ D Il ¥:: ~-{ ~'~/J~',--)
MUNICIPALITY OF ANCNORAGE
DEPARTMENT OF HEALTH AND ENVIRONMENTAL PROTECTION
825 t. Street, Anchormle, Alaska 99501 264.4720
SOILS LOG- PERCOLATION TEST
SOILS LOG
PERCOLATION
TEST
PERFORMED FOR:
LEGAL DESCRIPTION:
1
2
3-
4-
5-
6-
7
8
9-
14
20
COMMENTS
SLOPE
DATE PERFORMED:
0
SITE PLAN
PERFORMED DY:'
WAS GROUND WATER 9
ENCOUNTERED? ~'~ (-~
L
O
P
E
IF YES, AT WHAT ....
DEPTH?
¢ Gross Net Depth to Net
Reading Date Time Time Water Drop
_~ l ~/~.~ '. z ~, ^~. ..... .0 ....... 8.73, '~ ............
PERCOLATION RATE Z~- 0 {minutes/inch)
'EST RUN .E~EE" -- 0 FTAND . l& FT
Melvin R, Nichols
MUNICIPAt. ITY OF ANCilonA'GE
DEPARTMENT OF' HEALTII AND ENVIRONMENTAL PRO?ECTION
125 L, St~e.I, Anchor.ge, Al.~h~ 99501 264~720
~OILS LOG- PERCOLATION TEST
PERCOLATION
TEST
PERFORMED FOR'
LEGAL
2
:3
4
6-
6-
?-
8-
9-
"I'~ -
11
'12
13-
14-
15
16
17
19
SLOPE
.. 0
,~ITE PLAN
IF YES. AT WHAT _._.._-
DEPTH?
~ (]ross Net Depth to Net
Reading Dale Time T~rne Water Drop
7:58
· Z¢/-' ,0 ' . {minute,/inch)
,[~ SOILS LOG
MUNICIPALITY OF ANCHORAGE
DEPARTMENT OF HEALTH AND ENVIRONMENTAL PROTECTION
825 L. Street, Anchorago, Ainska 99501 264-4720
SOILS LOG - PERCOLATION TEST
10
11
12
d,~m~ b7 ~
PERCOLATION
TEST
SLOPE SITE PLAN
~AS GROUND WATER ~/~ ~
ENCOUNTEREd?
O
P
E
IF YES, AT WHAT
DEPTH?
13
14
15
16
17
18
19
20
COMMENTS
PERFORMED BY:
72-008 (6/79)
Gross Net Depth to Net
Reading Date
Time Time Water Drop
lz/~o/~Z Io:oo ^~', o I(b" 0
................ ~,~o -
(minutes/inch)
~ ET
~)
soils LO'~
MUNICIPALITY OF ANCHORAGE
DEPARTMENT OF HEALTH AND ENVIRONMENTAL PROTECTION
~ L. ~tre~t, Ar~horzgg, Ati~k, 09501 264-4720
~31LS LOG- PERCOLATION TEST
1
3
4 5~ ~'-.G rav~l/v
10
WAS GROUND WATER
12
IF YES, AT WHAT
OEPTI4?
13
14
18
19
' ~ ~ v,;._'_. ~ ', .
~~_~_L~:d~,,,~.,¢ _ ; ........
~ '~ , ;' 4 : ",'" ~/
PERCOLATION
TEST
5~5 Fo~sF %,b~',v;~;o~
SLOPE SITE PLAN
-F
Reading Date Gross Net Depth to Net
Time Time Water Drop
I 2 / :3e/52 10 :oo h~" 0 10" 0
~,, ",PERCOI~A~DN RATE {mlnutes/inchl
MUNICIPALITY OF ANCttORAGE
DEPARTMENT OF HEALTH & ENVIRONMENTAL PROTECTION
ENVIRONMENTAL HEALTFI CASE REVIEW WORK SHEET
[] PLATTING BOARD [] PLANNING & ZONING
CASE NUMBER NAME
S-5757 Spring Forest Subdivision
DATE RECEIVED
May 27, 1981
COMMENT TO PLANNING BY
June 19, 1981
FOR MEETING OF CASE OF
[] PUBLIC WATER ~1~ AVAILABLE TO PETITION AREA
~ PUBLIC SEWER J~7~-AVAILABLE TO PETITION AREA
71-014 IRev, 2L78)
May 20, 1981-~
W.O. ~A19732
Grid 92538
Joe Cange
400 West 76th Avenue
Anchorage, Alaska 99502
Attention:
Subject:
Joe Cange
Subsurface Investigation for Suitability Of On-Site
Sewage Disposal, Lots 3, 6, 8, 10, 13, 22, 24, 25,
28, and 31/32; Tract B, Spring Forest Subdivision
(Forsythe Property)
Dear Mr. Cange:
Test Holes were drilled on the subject lots to determine sub-
soil conditions and to determine suitability for on-site sewage
dlsposal. Transmitted herein are the soil l~gs for the test
holes with accompanying laboratory testing, and results of per-
colation tests rub in these holes. Also attached is a test
hole location sketch. The locations shown are approximate.
They were located using topographic features and by pacing
distances. We recommend strongly that they be located by sur-
vey as soon as possible to avoid confusion later.
The test holes were drilled on April 21 and 22, 1981, using a
Nodwell mounted, Mobile B-50 drill fitted with a solid flight
auger. The drill rig is owned and operated by benali Drilling,
Inc. The drilling was supervised and the test holes were
logged by Mr. O.M. Hatch, geologist with Alaska Testlab. Grab
samples were obtained at f.ive foot intervals in each test hole,
were visually identified, and were sealed in plastic bags to
preserve the natural moisture content. After drilling, a per-
forated, 3/4 inch PVC pipe was'placed in each test hole to
monitor water table elevations and to run the percolation test.
The percolation tests were performed by filling the test holes
with water and allowing them to saturate. The following day,
the holes were refilled with water, and the elevations of water
in the holes were measurd at 10 minute intervals for a one hour
period. The percolation rate given in this report was computed
using the minimum 20 minute absorption recorded in the perco!a-
tion test. The following table lists the measured percolation
rates.
Joe Cange
May 20, 1981
Page 2
Recommended Design
Lot Test Hole Percolation Rate
3 1 10.0
6 4 7.3
8 5 10.0
10 6 7.6
13 7 16.0
22 8 10.0
24 3 10.0
25 2 4.2
28 10 (High Ground Water)
31/32 9 3.2,
The measured percolation rates in Test Holes 1, 3, 5, and 8
were ~ctually less than 10.0 minutes/inch; however, we recom-
mend using this more conservative value due to the silty nature
of the soil. A perc test was not run in Test Hole 10, because
the h~.gh water (less than one foot) makes this area unsuitable
for on-site sewage disposal.
Disposal systems should be placed between 5 and 12 feet below
the surface except for Lots 31 and 32 where the systems should
be kept as shallow as possible to maintain the necessary separ-
ation from the seasonal high ground water level.
If you have any questions regarding these tests, please fee].
free to call.
Very truly yours,
ALASKA TESTLAB
Carl A. Bassler
Geotechnical Engineer
CAI~/mg
Attachments
Approved by:
Melvin R. Nichols, P.E.
Manager
T,H. tO
/?->O' 2. '~
F'-~GURE. I
Test Hole 1
Table A
Date: 4/21/81
Logged by: O. Hatch
WoO. #A19732
Depth in Feet
From To
Soil Description
0.0 0.5
Brown Peat, (Pt)
0.5 1.0
F-4, brown Sandy Siltf (ML)
1.0 3.0
F-4, brown Gravelly Sandy Silt, (ML)
~3.0 7.0
F-4, brown very Sandy Silt, (ML), moist,
stiff, non-plastic
7.0 12.5
F-4, brown Silt, (ML), trace sand, moist,
stiff, non-plastic
12.5 14.0
F-4, brown Gravelly Sandy Silt, (ML),
moist, stiff, non-plastic, 2"+
14.0 20.0
F-4, brown Sandy Silt, trace gravel, stiff,
moist, non-plastic
Set 3/4" perforated PVC pipe to monitor
water table elevation and run perc test.
Perc Rate = .0 lnutes/lnch.
Recommended%Design Perc Rate = 10.0
min/inch
Bottom of Test Hole:
20.0 Feet
Frost Depth:
3.0 Feet
Free Water Level:
None Observed
Type of Dry
Sample Depti] M% Sample Strength Group Unified
1 5' 14.1 G L A ML
2 10' 14.3 G N A ML
3 15' 14.5 G N A ML
4 20' 13.8 G N A ML
Remarks:
1. Type of Sample, G = Grab, SPT = Standard Penetration,
U = Undisturbed.
2. Dry Strength, N = None, L :~ Low, M = Medium, }{ = High.
3. Group refers to similar material, this study only.
4. General Informati. oa, see Sheet 1.
5. Frost and Textural Classifications, see Sheet 2.
Unifi. ed Classification, see Sheet 3.
Test Hole 2
Table B
Date: 4/21/81
Logged by: O. Hatch
W.O. #A19732
Depth in Feet
From To
0.0 1.0
1.0 2.0
2.0 8.0
8.0 16.0
Bottom of Test Hole:
Frost Depth:
Free Water Level:
...Soil Description
Brown Peat, (Pt)
F-4, brown Sandy Silt, (ML)
F-4, brown Gravelly Sandy Si!~, (ML),
moist, stiff, slightly plastic, 2"+
F-2/F-4, brown Silty Sand, (SM), moist,
medium dense, poorly graded, non-plastic,
with a 1' silt layer at 12'
Set 3/4" perforated PVC pipe to monitor
water table elevation and run perc test.
Perc Rate = 4.2 minutes/inch.
16.0 Feet
2.0 Feet
None Observed
Type of Dry
Sample Depth M% Sample Strength Group Unified
1 5' 13.2 G L B ML
2 10' 8.4 G N C SM
3 15' 9.4 G N C SM
Re ma rk s:
1. Type of Sample, G = Grab, SPT = Standard Penetration,
U = Undisturbed.
2. Dry Strength, N = None, L = Low, M = Medium, H = High.
3. Group refers to similar material, this study only.
4. General Information, see Sheet 1.
5. Frost and Textural Classification, see Sheet 2.
6. Unified Classification, see Sheet 3.
Test Hole ~3
Table C
WO %A19732
Date: 4/21/81
Logged by: OMH
Depth in Feet
From To
0.0 I .0
1.0 2.0
2.0 4.0
4.0 7.5
7.5 12.0
12.0 18.0
18.0 20.0
Bottom of Test Hole:
Frost Line:
Free Water Level:
Soil Description
Brown Peat, (Pt)
F-4, Brown Sandy Silt, (ML), moist, stiff, NP
F-l/F-3, Brown Silty Sandy Gravel, (GM), moist,
medium dense, p.g., 3" +
F-4, Brown Sandy Silt, (ML), moist, stiff
F-3/F-4, Brown Gravelly Sandy Silt, (ML), moist,
stiff, p.g., 3" +
F-4, Brown Sandy Silt, (ML), trace gravel,
moist, stiff-hard, 2" +
F-2/F-4, Brown SiXty fine Sand, (SM), moist,
stiff, medium dense
Set 3/4" perforated PVC pipe to monitor water
table e].evation and run perc test.
Perc Rate =~minutes/inch
Recommended Design Perc Rate = 10.0 minutes/inch
20.0'
2.0'
None Observed
Sa.
No. Depth
1 5'
2 10'
3 15'
4 20'
Type of Dry
M% Sample Strength Group Unified
19.3 Grab L B ML
10.7 Grab N B ML
12.2 Grab N A ML
13.1 Grab N C SM
~est Hole 4
Table D
Date: 4/21/81
Logged by: O. Hatch
W.O. #A19732
Depth in Feet
From To
0.0 1.0
1.0 8.0
8.0 11.0
11.0 15.0
15.0 16.0
Bottom of Test Hole:
Frost Depth:
Free Water Level:
Soil Description
Brown Peat, (Pt)
F-4, brown Gravelly Sandy Silt, (ML),
moist, stiff, non-plastic, 3"+
F-2, brown Silty fine Sand, (SM), moist,
medium dense, poorly graded
NFS/F-2, brown Sand, (SP), moist, medium
dense, poorly graded
F-2, brown Silty fine Sand, (SM), moist,
medium dense, poorly graded
Set 3/4" perforated PVC pipe to monitor
water table elevation and run perc test.
Perc Rate = 7.3 ~inutes/inch.
16.0 Feet
1.5 Feet
None Observed
Type of Dry
Sample Depth M% Sample Strength Group Unified
1 5 13.5 G N B ML
2 l0 8.3 - G N C SM
3 15 8.6 G N C SM
Re ma rk s:
1. Type of Sampler G = Grab, SPT = Standard Penetration,
U = Undisturbed.
2. Dry Strength, N = None, L = Low, M = Medium, H = High.
3. Group refers to similar material, this study only.
4. General Information, see Sheet 1.
5. Frost and Textural Classification, see Sheet 2.
6. Unified Classification, see Sheet 3.
Test Hole 5
Table E
Date: 4/21/81
Logged by: O. Hatch
W.Oo 9A19732
Depth in Feet
From To
Soil Description
0.0 1.0
1.0 2.0
2.0 4.0
4.0 15.0
15.0 20.0
Brown Peat, (Pt)
F-4, brown Sandy Silt, (ML), non-plastic
F-4, brown Gravelly Sandy Silt, (ML)
F-4, brown Sandy Silt, (ML), trace gravel,
moist, stiff
F-4, brown Gravelly Sandy Silt, (ML),
occasional cobbles, moist, stiff to hard,
non.-plastic, 12"+
Set 3/4" perforated PVC pipe to monitor
water table elevation and run perc test.
Perc Rate ~'~o6 minutes/inch.
Recommended Des'i n Perc Rate = 10.0
min/inch.
Bottom of Test Hole:
20.0 Feet
Frost Depth:
Free Water Level:
2.0 Feet
None Observed
Type of Dry
Sample Depth M% ~ample Strength Group Unified
1 5 17.0 G N A ML
2 10 20.0 G L A ML
3 15 12.8 G N A ML
4 20 10.6 G N B ML
Reraarks:
1. Type of Sample, G = Grab, SPT = Standard Penetration,
U = Undisturbed.
2. Dry Strength, N = None, L = Low, M = Medium, H = High.
3. Group refers to similar material, this study only.
4. General Information, see Sheet 1.
5. Frost and Textural Classification, see Sheet 2.
6. Unified Classification, see Sheet 3.
Test Hole 6
Table F
Date: 4/21/81
Logged by: O. Hatch
W.O. 9A19732
Depth in Feet
From To
0.0 1.0
1.0 2.0
~.0 7.5
7.5 14.0
14.0 16.0
Bottom of Test Hole:
Frost Depth:
Free Water Level:
Soil Description
Brown Peat, (Pt)
F-4, brown Sandy Silt, (ML), moist, stiff,
non-plastic
F-4, brown Gravelly Sandy Silt, (ML),
occasional cobbles, moist, stiff, 6"+
F-2/F-4, brown Silty fine Sand, (SM),
moist, medium dense, poorlp graded
NFS/F-2, brown Sand, (SP/SM), trace silt,
medium dense, poorly graded
Set 3/4" perforated PVC pipe to monitor
water tabl~__.t~V%~ion and run perc test.
Perc Rate ~ 7.6 m~nutes/inch.
2.0 Feet
None Observed
Type of Dry
Sample Depth M% Sample Strength Group Unified
1 5 16.4 G L A ML
2 10 7.3 G N C SM
3 15 4.2 G N D SP/SM
Remark s:
1. Type of Sample, G = Grab, SPT = Standard Penetration,
U = Undisturbed.
2. Dry Strength, N = None, L = Low, M = Medium, H = High.
3. Group refers to similar material, this study only.
4. General Information, see Sheet 1.
5. Frost and Textural Classification, see Sheet 2:
6. Unific~d Classification, see Sheet 3.
Test Hole 7
Table G
Date: 4/22/81
Logged by: O. Hatch
W.O. ~A19732
.Depth in Feet
From To
Soil Description
0.0 1.0
Brown Peat, (Pt)
1.0 2.0
F-4, brown Sandy Silt, (ML), moist, stiff,
non-plastic
2.0 9.0
F-4, brown Gravelly Sandy Silt, (ML),
moist, stiff, non-plastic, 3"+
9.0 11.0
F-4, brown Sandy Silt, (ML), trace gravel,
moist, stiff, non-plastic
11.0 13.0
F-3/F-4, brown very Silty Sand, (SM), moist
to wet, medium dense, poorly graded
13.0 ° 20.0
F-4, brown Gravelly Sandy Silt, moist,
stiff, non-plastic, 2"+
Bottom of Test Hole:
Set 3/4" perforated PVC pipe to monitor
water table elevation and run perc test.
Perc Rate ~ 16.0/~i~utes/inch.
20.0 F~Le~t~
Frost Depth:
2.0 Feet
Free Water Level:
None Observed
Type of Dry
Sample Dept~ M% Sample Strength Group Unified
1 5 9.3 G N B ML
2 10 15.6 G N A ML
3 15 12.6 G N B ML
4 20 11.3 G N B ML
Remarks:
1. Type of Sample, G = Grab, SPT = Standard Penetration,
U = Undisturbed.
2. Dry Strength, N = None, L = Low, M = Medium, I1 = IIigh.
3. Group refers to similar material, this study only.
4. General Information, see Sheet 1.
5. Frost and Textural Classification, see Sheet 2.
6. Unified Classification, see Sheet 3.
Test Hole 8
Table H
Date: 4/22/81
Logged by: O. Hatch
W.Oo ~A19732
Depth in Feet
F rom To
Soil Description
0.0 1.0
1.0 2.0
2.0 17.0
17o0 20.0
Bottom of Test Hole:
Frost Depth:
Free Water Level:
Brown Peat, (Pt)
F-4, brown Sandy Silt, (ML), moist, stiff,
non-plastic
F-4, brown Gravelly Sandy Silt, (ML),
moist, stiff, non-plastic, 3"+
F-2/F-3, brown Gravelly Silty Sand, (SM),
moist, medium dense, poorly graded, 3"+
Set 3/4" perforated PVC pipe to monitor
water table elevation and run perc test.
Perc Rate = 7.0 mlnutes/lnc~/
Recommended Design Perc Rate ~--: 10.0
min/i nch.
20.0 Feet
2.5 Feet
None Observed~
Type of Dry
Sampl~ Depth M% Samp. le Strength Group Unified
1 5 8.8 G N B ML
2 10 10.1 G N B ML
3 15 7.5 G N B ML
4 20 8.4 G N B SM
Remark s:
1. Type of Sample, G = Grab, SPT = Standard Penetration,
U = Undisturbed.
2. Dry Strength, N = None, L = Low, M = Medium, H = High.
3. Group refers to similar material, this study only.
4. General Information, see Sheet 1.
5. Frost and Textural Classification, see Sheet 2.
6. Unified Classification, see Sheet 3.
Test Hole 9
Table
Date: 4/22/81
Logged by: O. Hatch
W.O. #A19732
Depth in Feet
From To
0.0 5.0
5.0 7.0
7.0 16.0
Bottom of Test Hole:
Frost Depth:
Free Water Level:
Soil Description
F-4, brown Peat, (Pt) and Organic Silt,
(OL), moist, soft
F-4, brown Gravelly Sandy Silt, (ML),
moist, stiff, plastic +
NFS/F-2, brown Gravelly Sand, (SP/SM),
trace silt, medium dense, poorly graded
Set 3/4" perforated PVC pipe to monitor
water table elevation and run perc test.
Perc Rate = 32 minutes/inch.
16.0 Feet
1.0 Foot
4/22/81
4/23/81
Type of Dry
Sample Depth M% Sample Strength Group Unified
1 6 31.3 G M B Pt/OL
2 10 7.1 G N E SP/SM
3 15 10.4 G N E SP/SM
Remark s:
1. Type of Sample, G = Grab, SPT = Standard Penetration,
U = Undisturbed.
2. Dry Strength, N = None, L = Low, M = Medium, H = High.
3. Group refers to similar material, this study only.
4. General ]information, see Sheet 1.
5. Frost and Textural Classification, see Sheet 2.
6. Unified Classification, see Sheet 3.
Test Hole 10
Table J
Date: 4/22/81
Logged by: O. Hatch
W.O. #A19732
Depth in Feet
From To
Soil Description
0.0 1.0
1.0 3.0
3.0 6.0
6.0 10.0
Brown Peat, (Pt)
F-4, brown Sandy Silt, (ML), moist, stiff,
non-plastic
F-I, brown Silty Sandy Gravel, (GM),
saturated, medium dense, poorly graded, 3"+
NFS/F-2, brown Sandy Gravel, (GP/GM) to
Gravelly Sand, (SP/SM), occasional cobbles,
saturated, medium dense, poorly graded, 6"+
Set 3/4" perforated PVC pipe to monitor
water table elevation and run perc test.
Perc..-~t Not Run
Bottom of Test Hole: / 10.0 Fe.et
Frost Depth: ~~iii.~iI~'! 31~0~~
Free Water Level: ,
Type of Dry
Sample Depth M% Sample Strength Group
1 5 19.5 G L --
2 10 7.3 G N E
Unified
GM
GP/GM
Remarks:
1. Type of Sample, G = Grab, SPT = Standard Penetration,
U = Undisturbed.
2. Dry Strength, N = None, L = Low, M = Medium, H = High.
3. Group refers to similar material, this study only.
General Information, see Sheet 1.
5. Frost and Textural Classification, see Sheet 2.
6. Unified Classification, see Sheet 3.
.I