HomeMy WebLinkAboutAMUNDSEN Lots 1 & 2 Tract A S-8348
MUNICIPALITY OF ANCHORAGE
DEPARTMENT OF HEALTH & ENVIRONMENTAL PROTECTION
Environmental Health Division
CASE REVIEW WORKSHEET
CASE NUMBER:
S-8348
DATE RECEIVED:
November 27, 1985
COMMENTS DUE BY:
December 20, ']985
SUBDIVISION OR PROJECT TITLE:
Lots 1 & 2 and Tract A Amundsen Subdivision.
) PUBLIC WATER AVAILABLE
) COMMUNITY WATER AVAILABLE
COMMENTS: /2..~ ~.~,, ~ ,.~ .~...,.~
) PUBLIC SEWER AVAILABLE
71-014 (Rev. 5/83)
ALASKA B UIRO meE1TAL C,-O TROL SeRUlCe$, I C.
September 26, 1985
Jim Dowling
Dowling & Associates
804 East 15th Avenue
Anchoragef Alaska 99501
SOIL REPORT FOR THE PROPOSED AMUNDSEN SUBDIVISION
Dear Mr. Dowling:
Enclosed are the results of soil testing performed by Alaska Environmental
Control Services, Inc. (AECS), on W 1/2, NE 1/4, SE 1/4, Section 23, T12N
R3W Seward Meridian.
BACKGROUNB:
This area lies in the foothills of the Chugach Mountains, West of Hillside
Drive and North of Alatna'Avenue. General slope and drainage is to the
north-west. Elevations range from 814 to 924.
Vegetation is primarily black and white spruce and'alder, more well drained
locations, generally in the east, have occasional white birch. Much of
Tract A has visible surface water from recent heavy rains. In general,
areas with less slope are more poorly drained.
The soils encountered grade from thin seams of SANDY GRAVEL (GP) TO SANDY
SILT (ML).
DISCUSSION:
Tests were performed in conjunction with the requirements set forth in'
"Design Manual for On-site Wastewater Treatment and Disposal Systems"
(1980) published by the U. S. Environmental Protection Agency. The
testholes were dug by an INSLEY tracked backhoe on September 19, 1985.
The objective of our testing was to determine the soil suitability for
on-site septic systems. The important soil characteristics are 1) soil
depth (depth to bedrock);.2) depth to groundwater; and 3) soil percolation
rate.
Refer to the Appendix for individual testhole soil logs.
SHALLOW SOIL:
The results of our testing indicate that bedrock depths will not be a-
limitation in design.and installation of on-site systems. No bedrock was
encountered in our testholes.
SOIL WATER:
Water was encountered in testhole #1 at 13 feet. This depth should not be
a problem in installation of conventional septic systems. However, both
testholes were chosen in locally well drained areas. Much of TRACT A had
surface water ponding from recent heavy rains.
SOIL PERCOLATION RATE:
Both testholes encountered soils with good percolation rates (less than 150
square feet/bedroom.)
CONCLUSIONS:
Based on our testing we conclude that the soils identified in the two
testholes are suitable for on-site septic absorption systems. Caution
should be exercised in the design of building sites, access roads, and well
locations in order not to eliminate the suitable soil described. Much of
the site is visibly much more poorly drained. More testholes are suggested
before further subdivision of Tract A.
If you have any questions, please feel free to call me at 561-5040.
Sincerely,
Dennis Roe
Soils Scientist
Approved by:
Preside~ff
PhD, P.E.
Attachments - Testhole Location Plan
Boring Logs
ALASKA ENVIRONMENTAL
CONTROL SERVICES, INC.
! 200'West 33rd Avenue. Suite B
ANCHORAGE, ALASKA 99503
(907) 561.5040
F, SHEET NO, OF
CHECKEO BY. DATE
SC^LE I/': ~00 ~
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~ /...~.~' ~,~. J ~.....~' . ~ ~ ~ ~ ~ J ~ ~ ..............................
................ ~ : t / ~ [
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....................... ~ ............. : ............. 4 ............ ~ ........................... ~ ............. [ ................. ~ ............... ~ ..................
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........... ~ ............. ~ ............. L.~c~.A ' ' ' ~ ' · ~ '
Il
.... ~ ............. l ........................... ' ..................................... ~ ............. "' .............. ~ ........... ~ ........
........................................................................... ' ...................................................... ~ .............. ~ ............. ~ .............. [ ............
Municipality of Anchorage
DEPARTMENT OF HEALTH & HUMAN SERVICES
825 "L" Street, Anchorage, Alas ka 99502-0650
SOIL~ LOG -- PERCOLATION TEST
2
3
4
7
g
10
11
12
13
14
15
16
17
18
19
2O
WAS GROUNI
ENCOUNTERED?
Township, Range, Section:
SLOPE SITE PLAN
,/
Depth 10 Waor kltlr /~, ~.~.'~.
s
rF YES, AT WHAT /,~, O
DEPTH? ' "'" P
E
Monitoring? DiI~
Gross Net Depth to Net
Reading Date Time Time Water Drop
~., ~,-(~ ,~:~ ~ ~,~ .. 0 . '
~ ~:~ /0 D,
PERCOLATION RATE "~"'~"~ {minutes/inch) PERC HOLE DIAMETER
ACCORDANCE WITH ALL STATE AND MUNICIPAL GUIDELINES IN EFFECT ON THIS DATE.
GERT,FY THAT T.,S TEST WAS PERFORMED N
DATE: ~--~'~'--
PERFORMED FOR:
LEGAL DESCRIPTION:
Municipality of Anchorage
DEPARTMENT OF HEALTH & HUMAN SERVICES
825 "L" Street, Anchorage, Alaska 99502-0650
SOILS LOG -- PERCOLATION TEST
/'
2
3
4
6
7
8
9
10
11-
12-
13-
14-
15-
16
17
18
19
20-
Township, Range, Section: (,3 ~'J, '~'~, .~. ~"~ 7'/'~- 9
SLOPE S~TE PLAIN -
WAS G ROUND WATER
ENCOUNTERED? -
S
L
IF YES, AT WHAT 0
DEPTH? P
E
Depth 'to Water After
Monitoring? Date:
Gross Net Depth to Net
Reading Date Time Time Water Drop
/ ~ ,,., '~:~- , _
4 ~0 ~.'5~- ~.~o ~-~
PERCOLATION RATE ¢' '~ tminutes/inch) PERC HOLE DIAMETER ~'- /!
/' ,/TEST RUN BETWEEN ~oO FT AND ~:~' ~ FT
ACCORDANCE WITH ALL STATE AND MUNICIPAL GUIDELINES IN EFFECT ON THIS DATE,
CERTIFY THAT THIS TEST WAS PERFORMED IN
DATE: ~7_/~'_ ¢~""'" ·