HomeMy WebLinkAboutNEAR POINT S12022Onsite File
Near Point
Lot 1B-1 &Lot 1B-2
#512022
ANDERSON ENGINEERING
P.O. BOX 240773
ANCHORAGE, AK 99524
522-7773 677-7766 (FAX)
December 9, 2013
Building Safety Division
On Site Water and Wastewater Program
4700 Elmore Street
Anchorage, AK 99507
Attention: Debbie Wockenfuss
Subject: Nearpoint Subdivision — S12022-1
Septic System Feasibility Study
Dear Debbie:
The owner of Lot 1B, Near Point Subdivision intends to subdivide the lot into two lots.
The two lots are fronted by Nearpoint Drive in the Stuckagain Heights area of
Anchorage. The new subdivision will be known as Nearpoint Subdivision. Lot 113 is
currently developed with a well and septic system constructed years ago under a permit
from the State of Alaska Department of Environmental Conservation (ADEC). The
Certificates to Operate both the well and septic system are attached for your review.
The ground surface of the lots slopes to the west and northwest in the areas proposed
for septic system development. The slope varies and ranges from 10% to 20%. No
surface water is found in the area and sufficient area is available on each lot for the
septic system reserve areas and the wells either in place or proposed for construction.
Test holes were placed on the proposed lots in August of 2013. Water monitoring has
been ongoing with readings last taken on October 15, 2013. At that time both test holes
were dry. 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 depths of 14' 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 3.0' to 4.0' 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 well graded
gravel (GW) with varying degrees of sand was encountered to the bottom of each test
hole. The percolation rate in this material ranged from 1.4 to 1.5 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
Nearpoint Subdivision
December 9, 2012
Page 2
as the water monitoring results. No groundwater was found in either test hole and
none has been detected during the monitoring period.
Based on our field study and water monitoring completed to date it appears both lots of
the proposed subdivision are capable of supporting an onsite septic system and well.
We hereby request your approval of the subdivision as designed with the septic
systems and reserve area at the locations shown.
Sincerely,
Michael E. Anderson, P.E.
Attachments
2
R
ur Interval 2'
LE
B Well Location with top' Prolective Radius
,C ® Test Hole Designation and Location
A
1
/1
NEAR POINT SUBDIVISION
LOTS 1131 AND 1132
1\
p7
�C)
WELL AND SEPTIC SYSTEM PLAN •I fM'C No. EE -.381 DERSOM
-- �e Jam•.••.. T' S•'' 4
SCALE 1" = 100'
MUNICIPALITY OF ANCHORAGE
DEVELOPMENT SERVICES DEPARTMENT
4700 BRAGAW STREET ANCHORAGE, AK 99519-6650
DEPTH
Irmo
1-
2
3
4
5-
6
7
8
9
10-
11
12-
13-
14-
15-
16-
17-
18-
19 -
SOILS LOG - PERCOLATION TEST
LEGAL DESCRIPTION: LOT IB -I, NEAR POINT SUBDIVISION
PERFORMED FOR: JOE HENRI
DATE: 8/14/2013 PROJECTNo.:
PARCELID#: TECHNICIAN: M. ANDERSON
TEST HOLE 1
OB/OG
d
O
4
d
d
e
d
a
WELL GRADED GRAVEL
WITH SAND
a GW/GP
e
d _
a
e
BOH @ 14'
SLOHE
2%
49th
i1EL E. ANDERSON
No. CE -4381
Pmlessioml
SITE PLAN
SEE SITE PLAN
i
WAS GROUND WATER ENCOUNTERED"
IF YES @ WHAT DEPTH? .S
DEPTH OF WATER AFTER MONITORING: Nur+: (EPL) 5%
DATE OF MONITORING: 10, 3, 2013
DATE
READING
GROSS TIME
(MINUTES)
NET TIME
(MINUTES)
DEPTH TO
(INCHES)
NET DROP
(INCHES)
TEST HOLE PRESOAKED PRIOR TO TESTING:
8/16
1
8:13/8:23
10
.75"/7.50"
6.75"
2
8:24/8:34
10
.63"/7.38"
6.75"
3
8:35/8:45
10
.75"/7.38"
6.63"
4
8:46/8:56
10
.63"/7.38"
6.75"
5
8:57/9:07
10
.63"/7.38"
6.75"
6
9:08/9:18
10
.75"/7.50"
6.75"
PERCOLATION RATE:1.5 (MIN/INCH) PERC. HOLE DIA. g (INCHES)
TEST RUN BETWEEN: 3.0 FT. and 4.0 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: 8/23/13
MUNICIPALITY OF ANCHORAGE
DEVELOPMENT SERVICES DEPARTMENT
4700 BRAGAW STREET ANCHORAGE, AK 99519-6650
DEPTH
(feet)
1-
2
i -
4
6
7
8
9
10
11
12
13
14
15
16
17
18
19
SOILS LOG - PERCOLATION TEST
LEGAL DESCRIPTION: LOT IB -2, NEAR POINT SUBDIVISION
PERFORMED FOR: JOE HENRI
DATE: 8/14/2013 PROJECTNo.:
PARCEL ID#: TECHNICIAN: M. ANDERSON
TEST HOLE 2
OB/OG
a
a
e
b
D
4
a
WELL GRADED GRAVEL
WITH SAND
a GW/GP
a
a
a
a
BOH @ 14'
SLOPE
2%
49th_•:
MICHAEL E. ANDERSON
NO. CE -4381
SI I L KLAN
SFF SITE PLAN Y
i
9
WAS GROUND WATER ENCOUNTERED? NO
IF YES @ WHAT DEPTH?
DEPTH OF WATER AFTER MONITORING'. NONE 5%
DATE OF MONITORING'. 10/3/2013
DATE
READING
GROSS TIME
(MINUTES)
NET TIME
(MINUTES)
WATER D
(INCHES)
NET DROP
I (INCHES)
TEST HOLE PRESOAKED PRIOR TO TESTING:
8/16
1
10:02/10:12
10
.50"/7.75"
7.25"
2
10:13/10:23
10
.38"/7.50"
7.12"
3
10:24/10:44
10
.50"/7.62"
7.12"
4
10:45/10:55
10
.63"/7.75"
7.12"
5
10:56/11:06
10
.38"/7.50"
7.12"
6
11:07/11:17
10
.50"/7.62"
7.12"
PERCOLATION RATE: 1.4 (MINANCH) PERC. HOLE DIA. 611 (INCHES)
TEST RUN BETWEEN: 2.5 FT. and 3.5 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: 8/23/13
;/- I --� Municipality of Anchorage "` s,�
P.O. Box 196650 • 4700 Elmore Road n
i"
Anchorage, Alaska 99519-6650 • (90 3437904 • Fax 907) 343-7997
71 -ax ( 'n
9 lli p.0 anent
hftp:/Iwww.muni.org/Onsite
Development Services Division
On -Site Water and Wastewater Program
**** VARIANCE/WAIVER REVIEW ****
Waiver#: OSP141038 COSA#: Permit#: _
PID#:
Legal Description: 512022-1 proposed Nearpoint Lot 113
Engineer: Anderson Engineering
Applicant:
Your request for a waiver of the required 10 feet horizontal separation from the existing
absorption field for Lot 1B-2 to the proposed property line has been approved. The approved
separation distance is 2.0 feet. In addition, the proposed subdivision septic reserved area is
approved to be within 50' of an excessive slope. See the engineers letter and site plan.
Any future upgrade to the on-site wastewater disposal system will require all separation
distances be met or another approval from this department.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I
Waiver is Granted: X Waiver is not Granted:
Date: /( / Approved by: a
Name of Revie r
.......................................................... ...................
**** VARIANCE/WAIVER REVIEW ****
ANDERSON ENGINEERING
P.O. BOX 240773
ANCHORAGE, AK 99524
522-7773 677.7766 (FAX)
March 9, 2014
Municipality of Anchorage
Development Services Department
On -Site Water and Wastewater Program
P.O. Box 196650
Anchorage, AK 99519-6650
Subject: Nearpoint Subdivision — S12022-1
Separation Distance Waiver
Absorption Trench to Lot Line
Dear On Site Services Engineer:
The existing absorption trench on Lot 113-2 of the proposed Nearpoint Subdivision is
located 2' from the southwest corner of Lot 1 B-1. A lot line waiver is therefore required.
Soils on these lots are clean gravel with sand and silt with percolation rates less than 5
minutes per inch. Migration of effluent is unlikely. Placement of the trench in this area
does not impact Lot 1 B-1 as the septic reserve area is more than 35' from the trench.
In addition, the location of the trench does not impact the proposed location of the well
on that lot. We recommend a waiver be issued allowing the trench to be 2' from the
property line.
Sincerely, n
Michael E. Anderson, P.E.
ANDERSON ENGINEERING
P.O. BOX 240773
ANCHORAGE, AK 99524
522-7773 677-7766(FAX)
March 7, 2014
Building Safety Division
On Site Water and Wastewater Program
4700 Elmore Street
Anchorage, AK 99507
Attention: Debbie Wockenfuss
Subject: Nearpoint Subdivision — S12022-1
Septic System Feasibility Study
Reserve Area to Slope Waiver
Dear Debbie:
Test holes placed in the proposed Nearpoint Subdivision for Lots 1 B1 and 1 B2 indicate
clean well graded gravel with sand (GW/GP) and no groundwater. This material is
typically considered excellent for the treatment and disposal of septic effluent. We
have therefore established a 10,000 square foot reserve area for septic systems on
each lot. Unfortunately a small portion of the reserve area on Lot 1 B1 is less than 50'
from a break in grade greater than 25%. We are therefore requesting a waiver be
granted allowing the reserve area to be at the location proposed.
It is likely the septic absorption trench will be constructed more than 50' from the break
in grade and further assessment can be made with the permit for development of the
lot. The 25% slope from 2.5' above the invert of a distribution line of a trench
constructed at the limit of the reserve area will not daylight. This is the worst case
condition along the reserve area boundary. We therefore recommend the waiver be
issued allowing the reserve area as shown on the attached drawing.
Sincerely,
Michael E. Anderson, P.E.
:'• 49th S.
MICHAEL E ANCER50N
No CE -4781 1
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70' 65' 60' 55' 50' 45' 40'
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NEAR POINT
SUBDIVISION
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LOTS 1131
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ANDERSON ENGINEERING
P.O. BOX 240773
ANCHORAGE, AK 99524
522-7773 677-7766 (FAX)
November 17, 2013
Municipality of Anchorage
Building Safety Division
On Site Water and Wastewater Program
4700 Elmore Street
Anchorage, AK 99507
Attention: Debbie Wockenfuss
Subject: Near Point Subdivision, S-12022-1
Water Availability Study
Dear Debbie:
We have collected information on several wells in the area of the proposed Near Point
Subdivision to estimate the possible depths and production rates of wells to be
constructed in the future on Lots 1 B1 and 1 B2. A well is currently in place on Lot 1 B2
and is producing sufficient water to serve the home on the lot. The lot is currently
identified as Lot 1 B, Near Point Subdivision. Our study indicates 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'.
NEARPOINT SUBDIVISION
WATER AVAILABILITY STUDY
WELL
LEGAL DESCRIPTION
DEPTH
PRODUCTION - LOG
COMMENTS
Hillside North #7,Block 2,
Not Stated on Well
Bedrock from 19' to
Lot 6
400'
Log
400'.
Stuckagain Heights,
Bedrock from 37' to
Block 2, Lot 4C
128'
2.5 GPM
128'.
Stuckagain Heights,
Well Deepened from
Block 2, Lot 5
595'
2.9 GPM
300' to Improve GPM
Bedrock from 88' to
Stuckagain Heights # 2
370'. Well Flow Test
Block 1, Lot 8
1 129'
2.5-3 GPM
1997 - 2.0 GPM
Neat: Point Subdivision
November 17, 2013
Page 2
Stuckagain Heights # 2
Bedrock from 87' to
Block 1, Lot 7
300'
2 GPM
300'.
Stuckagain Heights # 2
Bedrock from 99' to
Block 1, Lot 6
305'
4.5-5 GPM
305'.
Stuckagain Heights # 2
Weathered Bedrock
Block 1, Lot 5
124'
20 GPM
from 115' to 124'.
Bedrock from 46' to
Near Point, Lot 1 B
355'
3.5 GPM
355'.
Stuckagain Heights # 2
Well Flow Test 2009 —
Block 2, Lot 2
1 294'+'
No Well Log
2.6 GPM
It is difficult from our study to predict the depth of the well to be constructed on Lot 1B1,
Near Point Subdivision. Lots to the east are shallow to depths from 124' to 129' with
production rates of 2.5 GPM to 20 GPM. Other wells in the area are up to 400' in depth
and constructed primarily in bedrock. The production rates in these wells range from 2.9
to 3.0 GPM. We estimate the well on Lot 161 will range in depth from 160' to 350' and
will produce approximately 2.0 GPM. The production rate will be sufficient to support a
four bedroom home.
Sincerely,
ww"'.d E Com,
Michael E. Anderson, P.E.
Attachments
VIA
41
� J
0 49th '•
••"
MICHAEL EANDER30N. �
n
No cE-a}ai ff
���
E
r
3
ur Interval 2
Well Location with 100' Protective Radius
® Test Hole Designation and Location
1
NEAR POINT SUBDIVISION
LOTS 1131 AND 1132
A SUBDIVISION OF TRACT A, BLM LOT 40 (PLAT NO. 70-377), AND BLM LOT 33, LOCATED
WITHIN THE NE 1/4, SECTION 22, T12N, R3W, S.M., ALASKA, ANCHORAGE RECORDING
DISTRICT, THIRD JUDICIAL DISTRICT, AND CONTAINING 5.41 ACRES, MORE OR LESS.
WELL AND SEPTIC SYSTEM PLAN
SCALE 1" = 100'
11
t■
2
4,.° 49th ! y . . *
REL E. MIDERSON
No. CE -4381