HomeMy WebLinkAboutGeneral Information (27)ILLS
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... , ' R'ONALD L.I'HIEL. PL _
January 17, 1972
Mr. Robert C. Johnson
Box 456
Eagle River, Alaska
Re: BIRCH HILLS TERRACE SUBDIVISION
Dear Mr. Johnson:
Purs'uant to your request, information as required by the
Anchorage Area Borough for submissions for plat approval
Greater
follows:
1. Topographic data
A topographic map with 5 foot contours is
2. Soil conditions
enclosed.
An extensive analysis of the subdivision's subsurface
soil conditions was made by utilizing information gathered
through three different means. First, the available soil
classifications conducted by the undersigned on adjoining
properties were reviewed. These two soil c~assifications,
as shown on the accompanying topography map as "S" &-"R",
were made from test holes twelve foot in depth. The upper
one foot was top soil and the remainder consisted of a well
graded gravel with discontinuous silt lenses one inch in
thickness and less. Secondly, visible cut banks from road
construction were viewed. The snow was removed from the
cut banks by a back hoe. These prepared areas allowed the'
undersigned to view a well graded gravel to a depth of four
feet in each location. 'Thirdly, test holes were located an~
excavated in three intermediate areas .which were determined.
by topographic features and vegetal growth to truly repre-
sent the interior of.the subdivision. The results of each
test hole were identical, one foot of top soil Covering well
graded gravel with a low silt content the total depth of
each test hole (10' to 12'). No discontinuous silt lenses
were encountered.
The conclusion of the soil conditions from visual in-
spection of vegetal growth and actual subsurface viewing on
a spacing of 350 feet and less is that the entire subdivision
consists of a mantle of top soil averaging one foot in depth
grading to silty gravel for the second foot of depth and
.finally a well graded clean gravel with occasional boulders
up to 12" in diameter. The average soils classification for
this subdtgtston would be lO0 s.f, per bedroom which would
require a seepage pit 6 feet in depth and 12.5 feet on each
side for an average three bedroom home.
3. Well and sewer system.'lQyout
A restricted well and s~wer system locations layout
is shown on the accompanying final plat. The relatively
higher ground on the rear of each lot is selected for the
well locations to allow a greater area for sewer system
placement and positive drainage from the well to the sewer
system. The sewer system may be placed at the owner's
option at any point beyond the outer limits of the protective
one hundred foot radius circle shown at each well location.
The owner should be advised to locate the sewer system at
the highest point possible, however, to allow for future
expansion should a seepage pit fail to function properly.
4. Potable water
The general area of Eagle River within the Eagle River
Loop Road, Eagle River Road, and the old Glenn Highway has
provided adequate water of a'domestic quantity in nearly
every attempt by well drillers in the past. The nearest
well uphill of Birch Hills Terrace Subdivision. is 550 feet
distance and is reported to be 87 feet in depth and the near-
est wells downhill are approximately'lO0 feet distance and
range from 127 feet to 187 feet in'depth. The four wells'
as shown on the accompanying plat provide adequate water
for single residences. Future well drilling in this area
should expect production.base'd on available information
of water, wells averaging 150 feet in depth and approximately
l0 gpm of water and more.
5. Statment
Based on all available information presented herein
the sewer and water systems as shown on the accompanying
plat can be installed in accordance with Chapter 9, Article
6, Greater Anchorage Area Borough code of ordinance thus
creating a safe and adequately developed subdivision.
Sincerely,
" RO~ALD L..THIEL, P.E.