HomeMy WebLinkAboutDONALD C SCHROEDER #3 UNIT 1 S-4052
Russell Oyster
694-2774
Civil Engineering
Soils ~ Foundations
Performed for: Name:
Legal
Depth
0
1
2
,TNEERING 6' DEVELC,
Box 90, Davis St., Eagle River, Alaska 99577
694-2774 or 333-5240
SOIL LOG
Mai 1 ing Address: =;:=.,%~_., ,. % ~\_ ~'~
Description: k~... '~_\ ~>~ ',.~:%
(feet) Soil
.lENT CO.
Tel. No. ~/~ m
Characteristics
Earl Ellis
333-524O
Surveying
Lan d Development
4
5
6
7
8
lO
ll
Ground Water Encountered: Yes
Proposed Installation: Seepage Pit
Comments: , , =' ~.>,~.)~ ~-~,
No v~ If yes, what depth
Drain Field
Performed by:
8)27b ,JANI7 1974
4839 Tampa Circle
Anchorage, Alaska 99504
June 2, 1974
Greater Anchorage Area Borough
Planning Department
3500 Tudor Road
Anchorage, Alaska 99507
Attention: !~. Wayne Mabry
Subject-.
Soils Evaluation and Related Items - Bacon Subdivision,
Unit ~2, Donald C. Schroeder Subdivision 93
Subdivision of TR 9, Donald C. Schroeder Subdivision ~2'
Dear }tr. Mabry:
The following information concerning the soils conditions for the
Proposed Bacon Subdivision located near the Eagle River Road in
.Eagle River, is submitted to satisfy the requirements of GAAB Ordi-
nance No. 112-72A, Chapter 21; and Title 18, Environmental Conser-
vation, 18 AAC 72.060 of the State of Alaska. Test Hole logs and
project location maps follow the text.
SITE LOCATION ~ND DESCRIPTION. The approximately 34 acre parcel
to be 'sUbdivided is located five miles east of the Glenn Highway
north of the Eagle River Road. The property is overgrown with
Birch, Fir and Cottonwood. The topography is steeply sloping to
the south over the entire acreage.
EXISTING WELLS AND SUBSURFACE DRAIN FIELDS. Existing wells near
the parcel to'be subdivided are not shot. a% on the project location
map. Water has been located in this area approximately 85' to
110' below the surface in fractured bedrock. Neighboring sub-
divisions (not shown on maP) have wells of sufficient capacity to
supply domestic needs. The existance of reliable water sources in
this geological area has been proven sufficiently to Borough
Officials in the immediate past. Previous chemical and bacterio-
logical testing of existing water sources has indicated that
drinking water quality standards are satisfied. ~
FIELD EXPLORATION: On },~y 27, 1974, five (5) testholes ~ere
excavated on site to depths of 16', 12-1/2', 12' , 7' , and 12-I/2'
respectively. The hole locations are sho%~n on the location map.
All holes were excavated by Hamann Construction Company of Eagle
River, Alaska, using a D-8 Cat Bulldozer and a Case Backhoe with
a 1/2 CY bucket. Direct observations were made on soil strata
and grab samples were taken both during and after excavation.
Testhole placement was made at sufficient locations to insure that
soil conditions were as expected.. There is more than sufficient
room on the tracts to locate water and wastewater facilities.
Greater Anchorage Area Borough
Page 2
June 2, 1974
GEOLOGY: The Eagle River drainage area is located within the Chugach
Mountains that border Cook Inlet. These mountains are a complex
mixture of deformed and metamorphosed sedimentary and igneous
rocks deposited during the late Paleozoic and Mesozoic Eras.
Five major Pleistocine glacial advances along the consequent or
subsequent lacustrine and alluvial deposits greatly influenced the
present topography of the area.
The surficial geologic unit of the site appears to be' part of
the Ea~le River cut as it worked through the late Pleistocene
lateral moraine deposits. The till of this deposit is commonly
sandy and stoney with cobbles common. Broken rock and sand pre-
dominate but silt and rock dust are ever present. Cobbles and
rocks are rounded rather than angular except for the shale deposits.
SUBSUR_~ACE CONDITIONS. The ground cover over the site generally
consists of a few inches of organic°cover underlain with silty
sandy gravel with a trace of organics for another four to six feet.
The surficial deposits of silty gravels or sandy silty gravels are
inter-spersed with cobbles. The upper layer of material is of
medium density and the lower level of harder density as evidenced
by the effort of the backhoe during excavation. Well graded
gravel was found in three holes, poorly graded sand or gravel in
the other two holes. The soils in general can be classified as
GW/GP/G~ by the Unified Soil' Classification System. The hardpan
appears to be a GP soil. Bedrock is found near the surface and
is sometimes exposed in the northern most portions of this tract.
~he gravelly soils contain about 70% by weight gravel or. cobbles
with the remainder sand and/or silt.
GrOundwater was encountered in only one hole as a'seeping flow
just above the hardpan layer and not as a saturated level. The
water was flowing through the soil and not p°nding. The ground
water level is probably at the surface of the hardpan. There is
no visible evidence of ponded water, rather the soil appeared
to be well drained, but compact.
CONCLUSION: Sufficient exploration has been accomplished on this
subdiviS£0n for the intended use with individual on-site water and
sewer facilities. Each lot has sufficient acreage to allow for
replacement soil absorption systems should the initial system fail.
The northernmost lots have almost three acres each. ~
The soils are suitable with respect to ~oundation bearing capacity
within the range of conventionally applied bearing pressures for
residential continuous concrete footings. If other than convent-
ional loads are anticipated, professional help may be required to
!8 !97(]
Greater Anchorage Area Borough
Page 3
June 2, 1974
design the foundation. The steep slopes must be considered in
any foundation system and road access will be difficult and only
possible with the large frontage provided.
Please/contact the undersigned if any expansion or clarification
of these data is necessary.
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