HomeMy WebLinkAboutBIRCH PARK S11995 Onsite File
Birch Park
#511995
ANDERSON ENGINEERING
P.O. BOX 240773
ANCHORAGE, AK 99524
522-7773 677-7766 (FAX)
Municipality of Anchorage
Building Safety Division
On Site Water and Wastewater Program
4700 Elmore Street
Anchorage, AK 99507
Attention: Debbie Wockenfuss
Subject: Birch Park Subdivision S-11995
Septic System Feasibility Study
Dear Debbie:
We recently reviewed the proposed plat for Birch Park Subdivision with the intent of
completing a subsurface soils study to identify areas suitable for the construction of on
site septic system to dispose of septic effluent to be generated from the houses
proposed for construction on the newly created lots. Birch Park Subdivision is located
near the intersection of East 112th Avenue and Birch Road. The parcel will be divided
into 3 individual lots with the remaining land added to the existing lot to the south which
will become Lot 4. The tract is currently identified as Tract A, BLM Lot 40 and BLM Lot
33. The new subdivision will be known as Birch Park Subdivision, Lots 1 through 4.
Access to the new lots will be off of Birch Road and East 112th Avenue.
The ground surface of the lots slopes from the east to the west at a grade
approximating 10% to 15%. Flatter areas were located on all of the proposed lots for
home sites and septic systems. Lot sizes are all in excess of 40,000 square feet in
surface area and sufficient space is available for placement of wells and septic systems
to meet the 100' setback requirement.
Test holes were placed on the proposed lots between March 18 and March 22, 2013.
Soil assessment and percolation testing continued during that period. Water monitoring
has been ongoing with readings last taken on May 15, 2013. To date no water has
been noted in any of the test holes to depths of over 20'. The purpose of the test holes
was to assess the underlying soil conditions and to determine whether septic systems
could be placed on the lots to serve single-family homes. The test holes were placed to
various depths ranging from 16' to 20.5' with no bedrock or impermeable lenses of
material encountered. The locations of the test holes were determined in the field for
use in the future for developing septic systems. Percolation benches were constructed
at various depths in the holes, but primarily 3' to 4' below the original ground surface. A
percolation cavity was prepared to determine the absorptive characteristics of the soils
encountered. The cavity was presoaked in accordance with Municipal requirements
and a percolation test performed. The results of the tests are included in the attached
documentation. In every case silty sand (SM) with varying degrees of silt was
Birch Park Subdivision S-11995
July 24, 2013
Page 2
encountered full depth except in Test Hole Nos. 3 and 5 where poorly graded gravel
with silt (GM/GP) was noted at 11' to 12'. This lense extended to the bottom of each
hole. The percolation rate in the SM material ranged from 48 minutes to 60 minutes per
inch. The GM/GP percolated much faster at 5 minutes per inch.
All work was completed under the direction of technicians and engineers at Anderson
Engineering. The results of the percolation tests and test hole logs are included as well
as the water monitoring results.
Based on our field study and water monitoring completed to date it appears all lots of
the proposed subdivision are capable of supporting an onsite septic system. A 16,000
square foot reserve area is shown on each of the proposed lots for septic system
construction. In addition, Test Hole Logs and a Location Map are included which
illustrate soils encountered, percolation rates and their respective location on the
individual lots.
Sincerely,
C-CL-6f
Michael E. Anderson, P.E.
Attachments
.7 OF 44'44*
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0,0"?i,". MICHAEL E. ANDERSON
•!rf's,• NO. CE-4381 ;'�
......................
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MUNICIPALITY OF ANCHORAGE 'i���a rrvi,a/
iv
DEVELOPMENT SERVICES DEPARTMENT •��zP�• ......••• •...
4700 BRAGAW STREET ANCHORAGE, AK 99519-6650 ''49th l' .,:**,.
SOILS LOG - PERCOLATION TEST i Ea -, ••
•
7, '.NICHAEL E. ANDERSON Vi
LOT I, BIRCH PARK SUB. �•J/ ;% NO. CE-4381 ;•;��
LEGAL DESCRIPTION: �J
q: i
PERFORMED FOR: JAMIE DITTRICH �• .< ▪�FES;�1���•
DATE: 3/18/13 PROJECT No.:
PARCEL ID#: TECHNICIAN: A. HARALA Professional Engineers Stamp:
DLI' I I TEST HOLE 1
(redo
OB/OG SLOPE SITE PLAN
1
4
2 a
4
G.
4 2%
SM
5
SEE SITE PLAN �,
4
I
6 4 3
7 a
d
8 •
9 —4 a
4
10 WAS GROUND WATER ENCOUNTERED? No
IF YES n WHAT DEPTH?
DEPTH OF WATER AFTER MONITORING: NONE c%
1 1 G DATE OF MONITORING: 5/15,13
• E
12 4
GROSS TIME NET TIME DEPTH TO NET DROP
13 n DATE READING (MINUTES) (MINUTES) WATER (INCHES)
(INCHES)
14 ° . • TEST HOLE PRESOAKED PRIOR TO TESTING:
15 3/18 1 9:40 5.75"
4
2 10:10 30 6.375" .625"
16
3 10:11 5.69"
17 a 4 10:41 30 6.315" .625"
18 • • " BOH @ 18.5'
5 10:42 5.75"
19 6 11 :12 30 6.375" .625"
20
PERCOLATION RATE: 48 (MIN/INCH) PERC. HOLE DIA. 8" (INCHES)
TEST RUN BETWEEN: 3 FT. and 4 FT.
COMMENTS: TEST HOLE PRE SOAKED PRIOR TO TEST.
TEST PERFORMED BY ANDERSON ENGINEERING. I, MICHAEL E. ANDERSON CERTIFY THAT
THIS WAS PERFORMED IN ACCORDANCE WITH ALL STATE AND MUNICIPLE GUIDELINES IN EFFECT ON THIS
DATE: 7/24/13
MUNICIPALITY OF ANCHORAGE ..�� tilki,a'•
DEVELOPMENT SERVICES DEPARTMENT =4,, P.•..• "'• 5,1s
4700 BRAGAW STREET ANCHORAGE, AK 99519-6650 :
:4./ 49th ", 1' *•
�%
SOILS LOG - PERCOLATION TEST 1>vt.-4,/,E . ••
•
.g.11 MICHAEL E. ANDERSON I Z,
LEGAL DESCRIPTION: LOT I, BIRCH PARK SUB. ��'�+' No. ��aaet ; iti,
•
PERFORMED FOR: JAMIE DITTRICH ••%titPROFESS COV
DATE: 3/18/13 PROJECT No.: Illesusix4
PARCEL ID#: TECHNICIAN:
A. HARALA Professional Engineers Stamp:
I)I?PTII TEST HOLE 2
(feet)
OB/OG SLOPE SITE PLAN
1
4
2
3 a
4
4 2%
SM
5 SEE SITE PLAN
4 ?
6 4
7 a
d
8 • .
9d :a
10
WAS GROUND WATER ENCOUNTERED? No
IF YES @ WHAT DEPTH?
DEPTH OF WATER AFTER MONITORING NONE 5%
11 DATE OF MONITORING: 5/15/13
• d
12 . .° •�
GROSS TIME NET TIME DEPTH TO
(INCHES) NET DROP
13 d DATE READING (MINUTES) (MINUTES) WATER (INCHES)
14 .° • TEST HOLE PRESOAKED PRIOR TO TESTING:
15 3/18 1 11:51 5.44"
4
2 12:21 30 5.94" .50"
16 5.375"
3 12:22
17
4 12:52 30 5.875" .50"
18 BOH @ 16.0'
5 12:53 5.50"
19 6 1:23 30 6.00" .50"
20
PERCOLATION RATE: 60 (MIN/INCH) PERC. HOLE DIA. 8" (INCHES)
TEST RUN BETWEEN: 3 FT. and 4 FT.
COMMENTS: TEST HOLE PRE SOAKED PRIOR TO TEST.
TEST PERFORMED BY ANDERSON ENGINEERING. I, MICHAEL E. ANDERSON CERTIFY THAT
THIS WAS PERFORMED IN ACCORDANCE WITH ALL STATE AND MUNICIPLE GUIDELINES IN EFFECT ON THIS
DATE: 7/24/13
MUNICIPALITY OF ANCHORAGE .��,,�a_trvi,ll�i,�/
DEVELOPMENT SERVICES DEPARTMENT �'.*** 444%.
DEVELOPMENT
4700 BRAGAW STREET ANCHORAGE, AK 99519-6650 �,•' "�;' �1•
i 49th
SOILS LOG - PERCOLATION TEST •
,ig .dL.ELL"-, ;
MUNICIPALITY OF ANCHORAGE .411+11rrrit_
DEVELOPMENT SERVICES DEPARTMENT •.��P�� S♦1♦
4700 BRAGAW STREET ANCHORAGE, AK 99519-6650 moi, .0.
(,4j. L
49thSOILS LOG - PERCOLATION TEST Ea-4A
MICHAEL E. ANDERSON
LEGAL DESCRIPTION LOT 2, BIRCH PARK SUB. 1♦�,�+�.. No. CE-4381 ��
PERFORMED FOR: JAMIE DITTRICH ♦♦♦ R. G� �•
DATE: 3/18/13 PROJECT No.: ♦,,1� sim*-4••
PARCEL ID#: TECHNICIAN: A. HARALA Professional Engineers Stamp:
DEFriI TEST HOLE 4
(feet)
OB/OG SLOPE SITE PLAN
1 .
4
2
3
O.
4 2%
SM
5 ° s;
SEE SITE PLAN v
4
6
7
• G
8
9 a
4 '
0 WAS GROUND WATER ENCOUNTERED? NO
1
° IF YES @ WHAT DEPTH? S
DEPTH OF WATER AFTER MONITORING: NONE 5%
1 1 DATE OF MONITORING: 5/15'13
• G
12 • .° 4
GROSS TIME NET TIME DEPTH To NET DROP
13 n DATE READING (MINUTES) (MINUTES) WATER (INCHES)
(INCHES)
14 ° TEST HOLE PRESOAKED PRIOR TO TESTING:
15 3/19 1 10:12 7.25"
xl
2 10:42 30 7.81" .56"
16 3 10:43 7.31"
17 • a
4 11:13 30 7.875" .56"
18 BOH @ 18.7' 5 11:14 7.375"
19 6 11:44 30 7.935" .56"
20
PERCOLATION RATE: 54 (MIN/INCH) PERC. HOLE DIA. 8" (INCHES)
TEST RUN BETWEEN: 3 FT. and 4 FT.
COMMENTS: TEST HOLE PRE SOAKED PRIOR TO TEST.
TEST PERFORMED BY ANDERSON ENGINEERING. I, MICHAEL E. ANDERSON CERTIFY THAT
THIS WAS PERFORMED IN ACCORDANCE WITH ALL STATE AND MUNICIPLE GUIDELINES IN EFFECT ON THIS
DATE: 7/24/13
MUNICIPALITY OF ANCHORAGE 440,1k yar>,i,,
DEVELOPMENT SERVICES DEPARTMENT ••� -..... .....
'• �♦14•
4700 BRAGAW STREET ANCHORAGE, AK 99519-6650 10
49th
•SOILS LOG - PERCOLATION TEST i�� F s
/.1.MICHAEL E. ANDERSON : t
LEGAL DESCRIPTION: LOT 3, BIRCH PARK SUB. �V�:1>'.. No. CE-4381
��, ti
PERFORMED FOR: JAMIE DITTRICH �• * DRLE si P
DATE: 3/18/13 PROJECT No.: ',1�psssi�••
PARCEL ID#: TECHNICIAN: A. HARALA Professional Engineers Stamp:
DHPTII TEST HOLE 5
(feet)
OB/OG SLOPE SITE PLAN
1
A
2
3
A.
4 2%
° SM
5 SEE SITE PLAN
A DENSE Z
6 • 4 •
7 a
8
94
d
10 WAS GROUND WATER ENCOUNTERED? NO
IF YES @ WHAT DEPTH? S
DEPTH OF WATER AFTER MONITORING NONE 5%
11 DATE OF MONITORING: 5/15/13
A
12 .° •4
GROSS TIME NET TIME DEPTH TO NET DROP
13— . • DATE READING (MINUTES) (MINUTES) WATER (INCHES)
n GM/GP (INCHES)
14 •° • COBBLES TO 8" TEST HOLE PRESOAKED PRIOR TO TESTING:
15 3/22 1 11:18 3.375"
2 11:48 30 9.50" 6.125"
16 3 11:49 3.50"
17 d 4 12:19 30 9.50" 6.00"
18 • - 5 12:20 3.25"
19 6 12:50 30 9.25" 6.00"
20
BOH @ 20.5' PERCOLATION RATE: 5 (MIN/INCH) PERC. HOLE DIA. 8" (INCHES)
TEST RUN BETWEEN: 1 1 FT. and 12 FT.
COMMENTS: TEST HOLE PRE SOAKED PRIOR TO TEST.
TEST PERFORMED BY ANDERSON ENGINEERING. I, MICHAEL E. ANDERSON CERTIFY THAT
THIS WAS PERFORMED IN ACCORDANCE WITH ALL STATE AND MUNICIPLE GUIDELINES IN EFFECT ON THIS
DATE: 7/24/13
MUNICIPALITY OF ANCHORAGE .00+tvnniiiii,,
DEVELOPMENT SERVICES DEPARTMENT ���P�E � •t•
4700 BRAGAW STREET ANCHORAGE, AK 99519-6650 i .' •1•,
49th
SOILS LOG - PERCOLATION TEST i7�' ,,.,,-,-L �-�I,�....J-
77,p,%MICHAEL E. ANDERSON i
LEGAL DESCRIPTION: LOT 3, BIRCH PARK SUB. ���:›;,., NO. CE-4381 .'�tiC':
r�,
PERFORMED FOR: JAMIE DITTRICH 7-x:0 *',v..
DATE: 3/18/13 PROJECT No.: ♦♦••,il� �5ivis-4
PARCEL ID#: TECHNICIAN: A. HARALA Professional Engineers Stamp:
I)FPrll TEST HOLE 6
(feet)
OB/OG SLOPE SITE PLAN
1 .
4
2
3
d.
4 2%
SM
'it
5 SEE SITE PLAN
. .4 2
6 4
7 a
A
8
9a
d
WAS GROUND WATER ENCOUNTERED? NO
10
° IF YES a WHAT DEPTH?
DEPTH OF WATER AFTER MONITORING: NONE 5%
11 DATE OF MONITORING: 5/15/13
• d
12 L
GROSS TIME NET TIME DEPTH TO NET DROP
13 . • DATE READING (MINUTES) (MINUTES) WATER (INCHES)
(INCHES)
14 ° • TEST HOLE PRESOAKED PRIOR TO TESTING:
15 • 3/18 1 10:29 5.25"
4
2 10:59 30 5.875 .625"
16 • 3 11:00 5.50"
17 °
d 4 11:30 30 6.125" .625"
18 BOH @ 18.7' 5 11 :31 5.375"
19 6 12:01 30 6.00" .625"
20
PERCOLATION RATE: 48 (MIN/INCH) PERC. HOLE DIA. 8" (INCHES)
TEST RUN BETWEEN: 3 FT. and 4 FT.
COMMENTS: TEST HOLE PRE SOAKED PRIOR TO TEST.
TEST PERFORMED BY ANDERSON ENGINEERING. 1, MICHAEL E. ANDERSON CERTIFY THAT
THIS WAS PERFORMED IN ACCORDANCE WITH ALL STATE AND MUNICIPLE GUIDELINES IN EFFECT ON THIS
DATE: 7/2[4/13
MUNICIPALITY OF ANCHORAGE '.00pin iviit_'
DEVELOPMENT SERVICES DEPARTMENT �*�p� •••"••• s�1�
4700 BRAGAW STREET ANCHORAGE, AK 99519-6650 i ,1� •• .j.
•
SOILS LOG - PERCOLATION TEST t / ••
-O. '.MICHAEL E. ANDERSON ,r�vi
r NO. CE-4381 C!
LEGAL DESCRIPTION: LOT 4, BIRCH PARK SUB. ♦sT •. v~,
PERFORMED FOR: JAMIE DITTRICH ��♦14� .?" '��P� ��
DATE: 3/19/13 PROJECT No.: ,�� 5ss 6��•
PARCEL ID#: TECHNICIAN: A. HARALA Professional Engineers Stamp:
DEPTH TEST HOLE 7
(leer)
OB/OG SLOPE SITE PLAN
1
4
2 a
3
e.
4 2%
SM
5 SEE SITE PLAN
a
6 4
7 a
d
8
9d
d
1 0a WAS GROUND WATER ENCOUNTERED? NO
IF YES @ WHAT DEPTH? S
DEPTH OF WATER AFTER MONITORING NONE 5%
11 • DATE OF MONITORING: 5/15113
C
12 a '4
GROSS TIME NET TIME DEPTH TO NET DROP
13 e DATE READING (MINUTES) (MINUTES) WATER (INCHES)
(INCHES)
14 .a TEST HOLE PRESOAKED PRIOR TO TESTING:
15 • 3/20 1 11:14 5.75"
4
2 11:44 30 6.31" .56"
16
17 ••• a BOH @ 17.0 3 11:45 5.50"
4 12:15 30 6.06" .56"
18 5 12:16 5.75"
19 6 12:46 30 6.31" .56"
20
PERCOLATION RATE: 54 (MIN/INCH) PERC. HOLE DIA. 8" (INCHES)
TEST RUN BETWEEN: 3 FT. and 4 FT.
COMMENTS: TEST HOLE PRE SOAKED PRIOR TO TEST.
TEST PERFORMED BY ANDERSON ENGINEERING. I, MICHAEL E. ANDERSON CERTIFY THAT
THIS WAS PERFORMED IN ACCORDANCE WITH ALL STATE AND MUNICIPLE GUIDELINES IN EFFECT ON THIS
DATE: 7/24/13
MUNICIPALITY OF ANCHORAGE .++e++••rvii,a
DEVELOPMENT SERVICES DEPARTMENT **�� A(Q'�1
4700 BRAGAW STREET ANCHORAGE, AK 99519-6650 '/ �� '.'91t
SOILS LOG - PERCOLATION TEST ;1 E6j� s
�. '.MICHAEL E. ANDERSON •i
LEGAL DESCRIPTION:
LOT 4, BIRCH PARK SUB. 1��� No. CE-4381 '; ��
PERFORMED FOR: JAMIE DITTRICH �'44e x-� �� P����
DATE: 3/19/13 PROJECT No.: •,�� �S•+ +�•
PARCEL ID#: TECHNICIAN: A. HARALA Professional Engineers Stamp:
DEPTH TEST HOLE 8
(teet)
OB/OG SLOPE SITE PLAN
1 1
4
2
3
4.
4 2%
cli
5 ° SM SEE SITE PLAN
• 4
6 4
7 a
d
8
9 .4
4
1 O WAS GROUND WATER ENCOUNTERED? NO
IF YES @ WHAT DEPTH? S
DEPTH OF WATER AFTER MONITORING. NONE 5%
1 1 DATE OF MONITORING: 5/15%13
• d
12
GROSS TIME NET TIME DEPTH TO NET DROP
13 . •d DATE READING (MINUTES) (MINUTES) WATER (INCHES)
(INCHES)
14 .° • TEST HOLE PRESOAKED PRIOR TO TESTING:
15 • • 3/20 1 11:17 6.94"
d 2 11:47 30 7.50" .56"
16 6.75"
17 ... ° BOH @ 17.0' 3 11:49
4 12:19 30 7.31" .56"
18 5 12:21 6.50"
19 6 12:51 30 7.06" .56"
20
PERCOLATION RATE: 54 (MIN/INCH) PERC. HOLE DIA. 8" (INCHES)
TEST RUN BETWEEN: 3 FT. and 4 FT.
COMMENTS: TEST HOLE PRE SOAKED PRIOR TO TEST.
TEST PERFORMED BY ANDERSON ENGINEERING. 1, MICHAEL E.ANDERSON CERTIFY THAT
THIS WAS PERFORMED IN ACCORDANCE WITH ALL STATE AND MUNICIPLE GUIDELINES IN EFFECT ON THIS
DATE: 7/24/13
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® Test Hole Designation and Location
Well Location with 100' Protective Radius
_ ____ J I I I s
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OF
ar C',/ ....:43qlt
1. BIRCH PARK SUBDIVISION
49th i‘ \*°01
;p:t41 `RSl)N 'W' WELL AND SEPTIC SYSTEM PLAN LOTS 1 THRU 4
#i%;.., No. CE-4381 ;°.� SCALE 1 = 100
• I A SUBDIVISION OF TRACT A, BLM LOT 40 (PLAT NO. 70-377), AND BLM LOT 33, LOCATED
•�,'<..' _j �' � �• WITHIN THE NE 1/4, SECTION 22, T12N, R3W, S.M., ALASKA, ANCHORAGE RECORDING
1144.PP........OC� 44•
DISTRICT, THIRD JUDICIAL DISTRICT, AND CONTAINING 5.41 ACRES, MORE OR LESS.
ANDERSON ENGINEERING
P.O. BOX 240773
ANCHORAGE, AK 99524
522-7773 677-7766 (FAX)
July 25, 2013
Municipality of Anchorage
Building Safety Division
On Site Water and Wastewater Program
4700 Elmore Street
Anchorage, AK 99507
Attention: Debbie Wockenfuss
Subject: Birch Park Subdivision, S-11752- It g q 6
Water Availability Study
Dear Debbie:
We have collected information on several wells in the area of the proposed Birch Park
Subdivision to estimate the possible depths and production rates of wells to be
constructed in the future on Lots 1 through 3. Lot 4 currently has a well in place. The
lot is currently identified as Lot 40, Tract A of T12N R3W Section 22. Field
investigations indicate all of the wells were constructed without the presence of bedrock
and cased the entire depth. In all cases the well are shallow in comparison to most
wells in the Anchorage area with the deepest at 197' and the shallowest at 120'.
SECLUSION SUBDIVISION
WATER AVAILABILITY STUDY
WELL
LEGAL DESCRIPTION DEPTH PRODUCTION - LOG PRODUCTION -TEST
Jodie Estates, Lot 1 134' 10 GPM 4.5 GPM
Jodie Estates, Lot 2 120' 8 GPM 4.03 GPM
Jodie Estates, Lot 3 128' 10 GPM
Jodie Estates, Lot 4 129' 10 GPM
Higgins, Lot 2 184' 40 GPM
Birch Park Subdivision
July 24, 2013
Page 2
T12N R3W SEC22 Lot 32
South 1/2 197' 60 GPM
Lot 40 Tract A(Fenwick
Circle) 146' 15 GPM 7.8GPM
T12N R3W SEC 22 Lot
40A 174' 7.8 GPM
Benslers Estates, Lot 1 138' 15 GPM 8.8 GPM
Benslers Estates, Lot 2 106' 7 GPM 4 GPM
Higgins Estates, Lot 1 148' 50 GPM
Thunderbrush, Lot 1 146' 15 GPM 5 GPM
It is obvious from our study that any wells to be constructed in Birch Park Subdivision in
the future will be placed to depths of less than 200' and will probably be cased the entire
depth. The production rates will be sufficient to support a four bedroom home and can
be expected to be between 4 and 8 gallons per minute.
Sincerely,
Michael E. Anderson, P.E.
Attachments
0 �• •49th •• ♦♦
•♦ Mic7f ANDERSON /4/
♦♦♦
---,•••?
,\ No. CE-4381 s����
1