HomeMy WebLinkAboutWALSH S-10852Walsh
#5-10852
Platting Officer:
There is no Muni Topo available for the proposed Walsh Subdivision area.
Attached please find the U.S.G.S. Anchorage (B6) NW, Alaska 1:25,000 Quad.
The subject property is predominately an alpine slope covered with medium density Cottonwood;
Birch and Spruce trees.
The topography ranges from very steep in the N.E. comer of Lot 2, to less than 5% in the S.W.
corner of lot one. Both lots have adequate areas with topography less than 25% suitable to
construct D.E.C. approved septic systems.
Sincerely,
Jack King
Alaska Land Development Services Inc.
,S 10 8 5 2 Lvov 2 6 2001
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OE2 THETA ENVIRONMENTAL ENGINEERING
23254 Northwoods Drive
Chugiak, Alaska 99567
(907) 688-0755
June 25, 2002
On -Site Services Program
Dept of Health & Human Services �1�f
Municipality of Anchorage
P.O. Box 196650
Anchorage, Alaska 99519-6650
Re: Walsh Subdivision, Lot 2, Short Plat, Summary of Action, 11/26/01, S-10852, Para 7
The information required by the subject Summary of Action, for Lot 2 is provided below.
The information for Lot 2 was provided under a separate cover.
1. The subject property currently has a dilapidated house trailer with structures added.
It is in poor condition and appears to be inhabitable. The trailer was served with a
pit privy and a surface water source. The pit privy is in poor condition and appears
to be unusable. The surface water was provided by an HDPE line lying on the
ground from a stream/spring source over a mile away from the trailer. The HDPE
line appears to terminate near the pit privy and does not appear to be connected to
the trailer.
2. The property lies adjacent to Eklutna Road and is located in Section 35, Township
16 North, Range 1 East, Seward Meridian. The lot is in the shape of an irregular
polygon with the southwest lot line, which is common with the Eklutna Lake Road
Right of Way.
3. The property is on the northeast slope of the Eklutna River valley and is
approximately 3 miles from Eklutna Lake. Eklutna Lake Road is cut into the slope
and the property has a series of natural and manmade slopes and terraces which
step-up the mountain and away from the Eklutna River. In general, the property
slopes southwest approximately a 60% slope with a 5 to 6 fool cutbank to the
northeast of the trailer and a vertical cutbank of approximately 8 feet between the
trailer and the road. The cutbank is followed by a 60% slope down to the ditch area
of Eklutna Lake Road. The slope from the south to the north appears to be variable
with a 25% slope to the south to a 10% slope to the north. The area in the vicinity
between the trailer and the upslope cutbank is generally flat.
4. The area, where soils absorption systems can be installed is located at the top of
the terrace adjacent to the upper cutbank. There is sufficient area for an original
and two replacement systems on the terrace. These systems will meet the slope
criteria for trenches and will be at least 50 feet away from a natural or manmade
slope of 25% or more.
6!25/02
HansonL2MuniLtrl
5. The soils found during the soils test were sandy silty gravel and silty sand. No
water was observed in the test holes, or in subsequent monitoring. These test
holes were installed and monitored in May 2002 and copies are attached. An
attempt to perform percolation tests near test holes # 1,2, & 3 was made. However,
the soils percolated faster than 1 minute per inch. It appears the percolation rate is
approximately 40 seconds per inch. A representative sample of the silty soil was
taken and analyzed by Alaska Test Lab, 6/10/02. The sieve test, copy attached,
indicates there is 58% sand and 8.1 % silt. This satisfies the requirement for the
sand to be at least 51%, if the percolation rate is less than 1 minute per inch.
6. For purposes of design, a percolation rate of 5 minutes per inch is assumed.
Based upon this percolation rate, a loading rate of 1.0 gal/day/S.F. is assumed. The
effective depth of a trench could be 7.0 to 9.0 feet below the distribution pipe,
depending upon where the septic tank was located. Based upon a 3 bedroom
dwelling, the area required for a 7.0 foot trench would be approximately 33 feet
long. This will allow the bottom of the trench to be at least 6 feet above an
impermeable layer or bedrock and at least 4 feet above seasonally high ground
water. Based upon this design, there is ample room for an original and two
replacement on-site wastewater disposal systems on this lot which will meet all the
requirements of AMC 15.65
7. There is an existing well and on-site wastewater disposal system on Lot 1, Walsh
Subdivision, which is across Eklutna Lake Road from the lot. There are no existing
wells, wastewater systems or surface waters within 200 feet of the area reserved
for an original and two replacement on-site wastewater disposal systems on Lot 2.
It is my professional opinion that the subject lot is suitable for on-site water and
wastewater disposal systems, and there is ample room for an original and two
replacement on-site wastewater disposal systems which meet all the requirements of AMC
15.65
If there are any questions, please feel free to contact me at (907) 242-0755.
in
/ U
Ronald . Godden, P.E.
Enclosures: Soils Logs, Test hole #1 through #5
Alaska Test Lab Sieve Analysis
Plan View Drawing
6/25/02
HansonUMunktrl
T Municipality of Anchorage
DEPARTMENT OF HEALTH & HUMAN SERVICES
825 "L" Street, Anchorage, Alaska 99502-0650
SOILS LOG - PERCOLATION TEST
PERFORMED FOR: Richard Hanson TH#1 DATE PERF
LEGAL DESCRIPTION LT 2 Walsh Subdivision Township, Range, Section: T16N, RIE, SEC 35
SLOPE SITE PLAN
DEPTH
(Feet)
Organics and loose small cobbles
1_
N
SM – Tan silty gravel with cobbles and boulders
2-
—7
e
3_
1 1 1 1 1
11111
11111
3%
4
11111
11111
1 1 1 1 1
SM –Grey silty gravely sand with cobbles and
5 _
i i i i
occasional boulders. Occasional silt lens LT 6 -
inches, sluffs easily.
g_
11 i I I
7- i i i i i No change.
11111
11111
6 11111
11111
11111
11111
11111
9 11111
11111
11111
10
IIIII
IIIII
11 _
11111
IIIII
12-
13-
14-
15-
16-
17-
18_
2 13 14 15 16 17-18_ i Damp
11111
11111
19
' ' ' ' Bottom of hole
WAS GROUND WATER
ENCOUNTERED? No
IF YES, AT WHAT L
DEPTH? NA o
P
E
Depth W Water After 5/28102
Monhoring? None atB1
on REMENEIN
20
PERCOLATION RATE LT1 (minutesrinch) PERC HOLE DIAMETER 6 inches
TEST RUN BETWEEN 3.0 FTAND 4.0 FT
COMMENTS Pre soak 45 gallons in 1.5 hours. Unable to perc.
PERFORMED BY: R. Godden I CERTIFY THAT THIS TEST WAS PERFORMED IN
ACCORDANCE WITH ALL STATE AND MUNICIPAL GUIDELINES IN EFFECT ON THIS DATE. DATE: 5/17/02
72-008 (Rev. 4/85)
Municipality of Anchorage
DEPARTMENT OF HEALTH & HUMAN SERVICES
825 "L" Street, Anchorage, Alaska 99502-0650
SOILS LOG - PERCOLATION TEST
PERFORMED FOR: Richard Hanson TH#2 DATE
LEGAL DESCRIPTION LT 2 Walsh Subdivision Township, Range, Section: T16N, R1 E, SEC 35
SLOPE SITE PLAN
DEPTH
5
p 3e
P 600
E 0" H#2
Reading Date Gross
Time (min)
Net Depth to Net
Time(mim Water (ft) Drop (ft)
NOT PERFORMED
(Feet)
Organics and loose rock
1_
2
GM — Tan silty gravel with cobbles and boulders
3
occasional silt lens LT 6 inches.
4
5
3e/
6-
11111
V I I I
7 -
V I I I
Iltll
i i i i i
SM —Grey silty gravely sand with cobbles and
I I I
occasional boulders. Occasional silt lens LT
g
V I I
1 1 1 1 1
6 inches.
V I I I
I111I
11111
g
I n t l
III1I
V I I I
10 I i i i WAS GROUND WATER
No
IIIIIIIII
18_ I I I I I Bottom of hole
19
IF YES, AT WHAT
DEPTH? NA
Depth to water After 5/28/02
xonrtoeoga None Dea;
5
p 3e
P 600
E 0" H#2
Reading Date Gross
Time (min)
Net Depth to Net
Time(mim Water (ft) Drop (ft)
NOT PERFORMED
20
PERCOLATION RATE LTi (minutes/inch) PERC HOLE DIAMETER 6 Inches
TEST RUN BETWEEN 6.0 FT AND 7.0 FT
COMMENTS Pre soak 45 gallons in 1.5 hours. Unable to oerc.
PERFORMED BY: R. Godden I Ronald E. Godden CERTIFY THAT THIS TEST WAS PERFORMED IN
ACCORDANCE WITH ALLSTATE AND MUNICIPAL GUIDELINES IN EFFECT ON THIS DATE. DATE: 5/18/02
72-008 (Rev. 4/85)
T Municipality of Anchorage
DEPARTMENT OF HEALTH & HUMAN SERVICES
625 "L" Street, Anchorage, Alaska 99502-0650
SOILS LOG - PERCOLATION TEST
PERFORMED FOR: Richard Hanson TH#3
DATE PERFORMED: 5/18/02
LEGAL DESCRIPTION LT 2 Walsh Subdivision Township, Range, Section: T16N, R1E, SEC 35
SLOPE SITE PLAN
DEPTH
(Feet)
Organics and loose rock
1 -
GM — Tan silty gravel with cobbles.
2
3-
4
5
Boulders 1 ft -2 ft.
5e/
6-
11111
11111
V I I I
7
111[1
l l t l
SM — Grey silty gravely sand with cobbles and
occasional boulders. Occasional silt lens LT
6_
1
6 inches.
II111
V I I 1
V I I 1
g
V I I I
IIItI
tWAS GROUND WATER
P,�r.�uwypvpnq No
■■■■■■■■N■
■■■EMEINW+ME
ORRUMMENNE
UNN■■■■■■.'.
11
12
13
14
15
16
17
1
1
Bottom of hole.
s
IF YES, AT WHAT L
DEPTH? NA 0
P
E
Depth to water After $126/02
Monitoring? None Date:
20 {
lul PERCOLATION RATE LT1 (minutes/inch) PERC HOLE DIAMETER 6 IfICheS
TEST RUN BETWEEN 6.0 FT AND 7.0 FT
COMMENTS Pre soak 45 gallons in 1.5 hours Unable to perc.
PERFORMED BY: R. Godden 1 Ronald E. Godden CERTIFY THAT THIS TEST WAS PERFORMED IN
ACCORDANCE WITH ALLSTATE AND MUNICIPAL GUIDELINES IN EFFECT ON THIS DATE. DATE: 5118/02
72-008 (Rev. 4/85)
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Municipality of Anchorage • • — •'
DEPARTMENT OF HEALTH & HUMAN SERVICES
825 %2' Street, Anchorage, Alaska 99502-0650 E •
SOILS LOG -PERCOLATION TEST �%, •••.P,.��i�i
PERFORMED FOR: Richard Hanson TH#4 DATE PERFORMED: 5M9f(72""
LEGAL DESCRIPTION LT 2 Walsh Subdivision Township, Range, Section: T16N, R1 E, SEC 35
SLOPE SITE PLAN
DEPTH
(Feet)
Organics and loose rock
1 _
2
— Tan silty gravel with cobbles and boulders.
3-Z3 -GM
H#4
III11
III11
III11
4
I I I 1 1
30�
III11
5
III11
III11
6-
V I I I
V I I I
V I I I
V I I I
SM —Grey silty gravely sand with cobbles and
ocasional boulders. Occasional silt lens LT
8
i i i i i
6 inches.
1 1 1 1 1
V I I I
I
9
V I I
11111
11111
11111
WAS GROUND WATER
10 - 1 1 1 1 1 PmC_nl INTFRFrI? No
11
12
13
14
15
16
17
18
19
Bottom of hole.
IF YES, AT WHAT
DEPTH? NA
Depth to Water After 5/28/02
monhorine? None Dal•,
S
L
0
P
E
20 I
lul PERCOLATION RATE LT1 (minutes/inch) PERC HOLE DIAMETER
TESTRUNBETWEEN -- FTAND — FT
COMMENTS Not perced based upon other holes
PERFORMED BY: R. Godden I Ronald E. Godden CERTIFY THAT THIS TEST WAS PERFORMED IN
ACCORDANCE WITH ALL STATE AND MUNICIPAL GUIDELINES IN EFFECT ON THIS DATE. DATE: 5/19/02
72-008 (Rev. 4/85)
• ae
T Municipality of Anchorage
DEPARTMENT OF HEALTH & HUMAN SERVICES
825 "L" Street, Anchorage, Alaska 99502-0650
SOILS LOG — PERCOLATION TEST
PERFORMED FOR: Richard Hanson TH#5
A-11 I
(EN SEAQ
• E a
•• '•IZCI•L�
DATE PERFORMED: 5119/02
LEGAL DESCRIPTION LT 2 Walsh Subdivision Township, Range, Section: T16N, R1E, SEC 35
SLOPE SITE PLAN
DEPTH
(Feet)
1 -
2
45°
s
0 5016 60
P
E !!L—V 5° THP
Organics and loose rock
GM - Grey silty sandy gravel with cobbles.
Net Depth to Net
Time(min) Water (ft) Drop (ft)
NOT PE FORMED
3 -I
H#5
4
3e/(
GM -Tan silty gravel with occasional cobbles
5
and boulders.
6-
IIIII
I
7 -
V I I
V I I I
iii
SM - Grey silty gravely sand with cobbles and
l i i l
occasional boulders. Occasional silt lens LT
g
i
6 inches.
Ilii)
II111
III11
9
Iltll
V I 1 1
10 j l l l I WAS GROUND WATER
- Illjl ENCOUNTERED? No
V I I I
V I I I
11 I iii 1
V I I 1
12-
13-
14-
15-
16
2 13 14 15 16
111II
V I I I
V I I I
17-
18-
19
7-
18-19
I Bottom of hole.
IF YES, AT WHAT
DEPTH? NA
Depth to Water After 5128!02
MonManno? None Date:
45°
s
0 5016 60
P
E !!L—V 5° THP
Reading Date Gross
Time (min)
Net Depth to Net
Time(min) Water (ft) Drop (ft)
NOT PE FORMED
20
PERCOLATION RATE LT1 (minutes inch) PERC HOLE DIAMETER --
TEST RUN BETWEEN -- FT AND -- FT
COMMENTS Notnerced based upon other holes
based upon other holes.
PERFORMED BY: R. Godden I Ronald E. Godden CERTIFY THAT THIS TEST WAS PERFORMED IN
ACCORDANCE WITH ALL STATE AND MUNICIPAL GUIDELINES IN EFFECT ON THIS DATE. DATE: 5/19/02
72-008 (Rev. 4/85)
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OE2 THETA ENVIRONMENTAL ENGINEERING
23254 Northwoods Drive
Chugiak, Alaska 99567
(907)688-0755
August 14, 2002
On -Site Services Program
Dept of Health & Human Services
Municipality of Anchorage
P.O. Box 196650
Anchorage, Alaska 99519-6650
To Whom It May Concern:
Re: Lot 1 & 2, Walsh Subdivision Reserve Areas
Attached is a drawing, which shows the reserve areas for Lot 1 & 2, Walsh Subdivision.
These areas comprise 10,000 square feet on each lot. It is my professional opinion
that, with site preparation, on-site soils absorption systems can be placed in any portion
of the reserve areas. These systems will meet all requirements in the current MOA
code, concerning the placement and separation distances required for such systems.
Further, the pit privy, which existed on Lot 2, has been removed and the remainder
appears to be properly abandoned in accordance with appropriate sanitary practices.
A CD containing photo JPG files shows the areas and the site of the abandoned pit
privy. It is my hope the drawing, this letter, and these photos will provide adequate
information to grant the completion of the platting process.
If you have any questions, or desire further information, please contact me at either
688-0755 or, 242-0755.
Attachments:1
2
3
8/14102
WelshPlatlLtrl
Drawing, Lot 1 & 2, Walsh Subdivision, Reserve Areas
CD with JPG files # 41 through 48
List of Photos
Photo List
Lot 2
1. # 41 Looking at former pit privy area.
2. # 42 At pit privy area, looking NW towards TH # 1
3. # 43 At TH # 1, looking NW at TH # 2 & 3.
4. # 44 At TH # 3, looking NW at TH # 4 & 5.
5. # 45 At TH # 5, looking SE at TH # 4 through 1.
Lot 1
6. # 46 At Point A, looking at existing system and reserve area.
7. # 47 At Point B, looking at existing system and reserve area.
8. # 48 SW of Point A, looking at existing system and reserve area.
8/14/02
WelshPlafttrl
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