HomeMy WebLinkAboutDON JACK S12370 Onsite File
bon Jack
Tr A - 1 & A - 2
#512370
Rodney P KinnevAssociates,inc.
CeessItIuu MMus a farvevsrs
November 1,2017 17-1815.17
Municipality of Anchorage
4700 Elmore Road
Anchorage,AK 99507
Reference: Don Jack Subdivision Tract A-1
Rodney P. Kinney Associates, Inc. (RPKA)performed percolation testing,water level monitoring,and
soil test pit logging in the Don Jack Subdivision Tract A-1 and determined that there is sufficient septic
system area available to meet the requirements of MOA Code 15.65.180 and that required separation
distances from existing and proposed wells are met.
A signed and stamped percolation test log and a Site Plan to scale with contours that show the
percolation test location for the proposed subdivision are included with this letter.The Site Plan,Figure
1, shows and demonstrates the following.
1. There are no developments on the proposed Tract A-1.
2. Locations of existing wells, and septic systems within 100 feet of Tract A-1. The drawing
shows that wells and septic systems on neighboring lots are located at greater distances than
100 feet from proposed septic system.
3. There are no conflicts with existing surrounding water supply well and septic systems.
4. Sufficient existing reserved areas per MOA Code 15.65.180 meet separation requirements from
existing and proposed property lines, proposed wells, and existing wells.
5. Topography is sufficient to comply with MOA Code 15.65.060.
6. There are no surface waters within 100 feet of any of the proposed septic system areas.
The depths from surface to groundwater after the seven-day stabilization and monitoring period is
indicated on the percolation test log and summarized below along with the percolation test result.
TH-1: 14 feet soils investigation depth and 7-day groundwater stabilization and monitoring,
and seasonal high water level documented on October 31,2017.Percolation Rate=7.3 minutes
per inch(mpi)from 4.0 to 5.0 feet below the ground surface.No water was encountered while
digging, and but water was encountered in the standpipe to the bottom of the hole after seven
days. This is suspected to be the result of water from the 2 inch diameter vein of underground
flow found during excavation at roughly 5 feet below the surface accumulating in the disturbed
test pit soils.
Wastewater disposal system should be located as to avoid all underground water veins which
may be encountered during construction. Otherwise,the gravelly and sandy soils encountered
during test pit excavation should not require any abnormal considerations with regard to
foundation constructability since neither shallow groundwater nor ground ice conditions are
anticipated to be encountered.
16515 Ceeterllelll Drive ■ Suite 101 a Eagle River,Alaska ■ 99577
907.694.2332 ■ Fax 907.694.1807 ■ www.rpka.aet
Don Jack Subdivision Tract A-1
Soil Report and Septic System Area Investigation
Page 2 of 2
MOA Code 15.65.180 states a reserved area of 12,000 square feet is required with a percolation rate
in the range from 5 to 12 mpi. The septic reserve area indicated on Figure 1 is 12,000 square feet
(average 160' x 75').
If you have any questions, please contact me at 694-2332.
Sincerely,
RODNEY P. KINNEY ASSyOCIATES, INC.
-S
Simon Gilliland, PE
Project Engineer
TEST HOLE
LOCATION
164TH STREET
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V PROPOSED
/ /" 11-I / SEPTIC SYSTEM
' - / LOCATION
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PROPOSED i 4--
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PROPOSED ' /
— _ �' TRACT A-2 0 '
LOT 3 SEPTIC o
AREA � I
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LEGEND 1 L / ' — p
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580 CONTOUR (MAJOR)
CONTOUR (MINOR) ,����oF�Av\1
SUBDIVISION BOUNDARY S ro*:.'...',.4,p is
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PROPERTY LINE �*. 49 F` .:*ii
— — ADJACENT PROPERTY LINE 0 44*"."�-�" ,
slow C GIwurw: i
EASEMENT LINE i6 -._No.`Ez,o r �
STREAM MEANDER LINE �1�%��\\`l w. �� GRAPHICo SCALE 50 100
POND — um m
-0- EXISTING WELL 1 inch = 100 feet
i
DON JACK SUBDIVISION SOIL REPORT
R011ev P. Emmy Associates,int. SE1/4 SEC. 3, T11 N, R3W, S.M. LOCATION MAP
cSurittIU tool $ ANCHORAGE RECORDING DISTRICT 11/01/17 FIGURE 1
J
Municipality of Anchorage (En�•wLLI► AL)
Development Services Department �t •. •�.5��i
Building Safety Division .i y (,-.64_
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. On-Site Water and Wastewater Program j*; 49L+ /" .* °9
4700 Elmore Road /' �
.t P.O. Box 196650 Anchorage,AK 99507 / j+.NOlt d/t�� C
www.ci.anchorage.ak us y SIYON C GtllrlANa ;,r;
(907)343-7904 lVA-V•
•. No CEl1 T31 '• Wi
Soils Log - Percolation Test ,�4t��OFESSOt_
Performed For: Michael More Date Performed:08/25/2017
Legal Description: Don Jack Subdivision Track A-1 Township,Range, Section: T11 N, R3W,S3
C\
Slope Site Plan
i
Depth //
SFeet
1 O 1.5 Pt
2- i
3- '' 0
4-,o 1 5 _ , 5 C •
5-' . .0
6- '
,
7-
8- t
WAS GROUND WATER 6c,i'
9-" I ENCOUNTERED? No
S
10- IF YES,AT WHAT DEPTH? NA t _ __ __�
a ! rr M Depth to Water After P 5,j G
11 i ' I v ' I Monitoring? 11.25 ft E `L II v
12- Date: 09/01/2017
5(,c
13- I
Seas.r.sl tier, wa+er 9. son oh ocf 31, 2o/7
14- Reading Date Gross Time Net Time Depth to Water Net Drop
15- 12" 8/25/17 0 min 0 min 0" 0"
16- 10.25" 8/25/17 10 min 10 min 1.75" 1.75"
17- 8.75" 8/25/17 20 min 10 min 3.25" 1.5"
18- 7.375" 8/25/17 30 min 10 min 4.625" 1.375"
19- 6.0" 8/25/17 40 min 10 min 6.0" 1.375"
20- 4.625" 8/25/17 50 min 10 min 7.375" 1.375"
3.25" 8/25/17 60 min 10 min 8.75" 1.375"
PERCOLATION RATE 7.27 (m nutes+inch) PERC HOLE DIAMETER 6"
TEST RUN BETWEEN 4 FT AND 5 FT
COMMENTS Small underground stream(2"diameter vein)encountered when excavating. This along with surface runoff from up hill entering the loose
soils which were excavated is suspected to have contributed to ground water being found when monitored since not encountered during placement.
PERFORMED BY: Simon Gilliland I Simon Gilliland CERTIFY THAT THIS TEST WAS
PERFORMED IN ACCORDANCE WITH ALL STATE AND MUNICIPAL GUIDELINES IN EFFECT ON THIS DATE. DATE: 09/01/2017