HomeMy WebLinkAboutMARVINS GARDEN S12404Onsite File
GARNESS ENGINEERING GROUP, Ltd
ENGINEERING SALES CONSULTING
October 30th, 2018
Municipality of Anchorage
Development Service Department
On -Site Water & Wastewater Program
4700 Elmore Road
Anchorage, AK 99507
Advanced T-rarment Sys[o-r?
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Subject: Soil Investigation report and Septic Reserve Area for the Proposed Subdivision
Nash Subdivision; Lots 1, 2 and 3 in Anchorage, Alaska (A Subdivision of T12N R3W
Section 21 Lot 12 — S12404 Nash Subdivision)
To whom it may concern:
The referenced property is located off Hane Street in Anchorage, Alaska. Based upon a
preliminary plat drawing provided to us by Farpoint Land Services, LLC, T12N R3W Section 21
Lot 12 is proposed to be subdivided into three lots, Nash Subdivision; Lot 1, Lot 2, Lot 3. The
current lot (T12N R3W Section 21 Lot 12) has a MOA approved well and septic system. We
have excavated and logged two testholes on each proposed undeveloped lot (four testholes
total) that have been used to establish the septic reserve areas for the proposed subdivision.
PROPOSED SEPTIC RESERVE AREAS:
We have soil logs for the test holes (see attached). Per MOA Wastewater ordinance AMC
15.65.180, we are required to provide a site map showing a septic reserve area that meets the
requirements set forth in Table 7 shown below:
Table 7. Reserved Area Requirements
Percolation Rate
(minutes/inch)
Reserved Area
(square feet)
1 -5
10,000
6-12
12,000
13-24
14,000
25-60
16,000
The percolation rate for proposed Lot 2 was 10 and 13 min/inch. Based upon Table 7, the
proposed Lot 2 requires a septic reserve area of 12-14,000 ft2. Additionally, the percolation rate
for the proposed Lot 3 was less than 1 min/inch. Based upon Table 7, the proposed Lot 3 would
require a reserve Area of 10,000 ft2. Attached is a site plan which shows the septic reserve
areas for the proposed lots. Additionally, attached is the "plot plan" which has the topography
information provided by Farpoint Land Services, LLC. that has been transposed onto our site
3701 East Tudor Road, Suite 101 * Anchorage, Alaska 99507-1259
Phone: (907) 337-6179 * Fax: (907) 338-3246 * Website: www.garnessengineering.com
Page 2 of 2
plan. As can be seen on the attached drawing, there are slopes greater than 25%, however,
there are no slopes greater than 46%.
WATER AVAILABILITY:
As can be seen on the attached site plans, a private well is being proposed for water service to
each property. The well will be drilled to supply water to the house. Per the COSA inspection for
the adjacent lots Hane S/D; Tract 2 the well production is 5+ gpm and approximately 216 feet in
depth. Additionally, per the COSA inspection report for the adjacent lot Blacktree; Lot 1, the well
production was 4.2+ gpm with a total depth of 201 feet. Also, attached are the water sample
results in MOA records for the adjacent lot nitrate levels. In short, we do not suspect any issues
with regards to water availability or quality.
NITRATE ANALYSIS:
Attached is the water sample results for adjacent lots (Ptarmigan View Estates; Lot 8 - 2005,
Hane S/D; Tract 2 - 2011, Blacktree; Lot 1 — 2011, Fireweed; Block 1, Lot 2 - 2014) from MOA
records. As can be seen, nitrate levels were non-detectable for the 4hraa lots. In short, we do
not anticipate water quality issues. t.{.�
Sincerely, /A
Jeffrly 1 „ r ess E., M.S.
3701 East Tudor Road, Suite 101 * Anchorage, Alaska 99507-1259
Phone: (907) 337-6179 * Fax: (907) 338-3246 * Website: www. garnessengineering.com
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PREPARED FOR: PHONE NUMBER: PAGE NUMBER: 0 �,J • •rey A. Garr eSS •.:• W ■
WESTON NASH 907-748-5181 1 OF 1 ♦j�. CE T�35 �e
PROJECT/LEGAL DESCRIPTION: DRAWN BY: •�♦�(�. 7(j I Ci•'���0
PROPOSED SUBDIVISION OF T12N, R3W, SECTION 21, LOT 12 D.J.G. ♦ c��''••••••.....•. •• �, •
TYPE OF WORK: DATE: LICEN�#,e"ROFESNllvilkw``J� ••
�, SITE PLAN FOR SEPTIC RESERVE AREA AND WELL SITE 10/23/2018 #AECc884
EXISTING 4
BEDROOM HOUSE
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GARAGE
ALTERNATE SITE DESIGN CRITERIA:
NUMBER OF BEDROOMS: 4
GALLONS PER DAY (GPD): 600 GPD
PERCOLATION RATE/S: 40
PROPOSED APPLICATION RATE: 2 GPDBEDROOM
MINIMUM DRAINFIELD SQ.FT.: 300 FT'
'CAT III ADVANCED TREATMENT
ALTERNATE SITE DRAINFIELD DESIGN:
MAXIMUM DEPTH: 11 FEET
WIDTH: 2.5 FEET
LENGTH: 20 FEET
EFFECTIVE: 6 FEET
ACTUAL SQ.FT.: 320 FT'
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\\ ALTERNATE SITE /
SEPTIC SYSTEM
20XIMATE LOCATION OF T.H. BY STE
R. PANNONE, P.E. IN MOA RECORDS
GARNESS ENGINEERING GROUP, Ltd
ENGINIFFRINGoSALFSorONSUITING _
3701 E. TUDOR ROAD, SUITE 101 -ANCHORAGE, AK 99507' PHONE (907) 337.6179' FAX (907) 338-3246 • WEBSITE: v .gamessengineenng.com
PREPARED FOR: PHONE NUMBER: PAGE NUMBER:
WESTON NASH 907-748-5181 1 OF 1
PROJECT/LEGAL DESCRIPTION: DRAWN BY:
T12N R3W SECTION 21 LOT 12; ALTERNATE SITE LOT 1 D.J.G.
TYPE OF*WORK: DATE:
�, PROPOSED SEPTIC RESERVE AREA FOR LOT 1 10/30/2018
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David Garness
From:
Weston <westonnash@gmail.com>
Sent:
Wednesday, October 17, 2018 11:41 PM
To:
David Garness
Subject:
Re: T12N R3W Section 21 Lot 12
David,
Disconnected the water supply right at the well head.
On Wed, Oct 17, 2018 at 4:54 PM David Garness <David@garnessengineering.com> wrote:
Yes, please provide a picture when complete and if the MOA requires I can come by and inspect it also.
Sent from my iPhone
On Oct 17, 2018, at 4:49 PM, Weston <westonnash@gmail.com> wrote:
Easy as pie! The well is in my primary house. With a clearly labeled supply line to the cabin. I will
disconnect and cap it. DO I need to provide a picture or any evidence?
Weston
On Wed, Oct 17, 2018 at 4:38 PM David Garness <David@garnessengineering.com> wrote:
Weston,
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GARNESS ENGINEERING GROUP, Ltd
FNGINFFRING o RAI F..9 o CONSII TING : -
3701 E. TUDOR ROAD, SUITE 101 'ANCHORAGE, AK 99507' PHONE (907)337-6179 ' FAX (907)338-3246 - WEBSITE: w gamessengineenng.com
SOIL LOG - PERCOLATION TEST
LEGAL DESCRIPTION: Tl 2N R3W SECTION 21 LOT 12
PERFORMED FOR: _
DEPTH
WESTON NASH
I, feet)
11111111
0
ORGANICS
1
161111'1
7/6/2018
DRY
2
W,YY
LOAM
3
I����,���`7���1
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•
4
6
7
8
9
10
11
12
13
14
15
16
17
18
GP TO SP
HEAVY SLOUGHING
DURING CONSTRUCTION
DATE: 6/28/2018
TEST HOLE #1
SOIL CLASSIFICATIONS
•
11111111
0
DRY
6/28/2018
161111'1
7/6/2018
DRY
10/4/2018
W,YY
IIIIIIIII
I����,���`7���1
7/Y�
•
DEPTH TO
GROUNDWATER
DATE
DRY
6/28/2018
DRY
7/6/2018
DRY
10/4/2018
SITE PLAN
DATE READING
CLOCK
TIME
NET TIME
(MINUTES)
WATER LEVEL
READING
NET DROP ,
(INCHES)
6/29/2018 ABSORBED 5 GALLONS IN —2 MINUTES (FASTER THAN 1 MIN/INCH)
19 PERCOLATION RATE <1 (MIN./INCH) PERC. HOLE DIA. _
TEST RUN BETWEEN 4 FT. AND 5 FT.
20 A FOUR HOUR PRESOAK WAS PERFORMED:
❑ YES N NO
SOILS LOGGED BY: JODY MAUS PERCOLATION TEST PERFORMED BY: ERIK WIDGER
COMMENTS: PERCOLATION READINGS ARE WITHIN 1/16 OF INCH.
PERFORMED BY GEG, Ltd. I, JEFFREY A. GARNESS, CERTIFY THAT THIS WAS PE FORM D IN ACCORDANCE
WITH ALL STATE AND MUNICIPAL GUIDELINES IN EFFECT ON THIS DATE: 'Z 8
6 (INCHES)
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GARNESS ENGINEERING GROUP, Ltd
EN6INFlFRINGc.SAl FSo QQNS111 TIN —
3701 E. TUDOR ROAD. SUITE 101 -ANCHORAGE. AN 99507' PHONE (907) 337-6179' FAX (907)33"246 ' WEBSITE: wanv.gamessengineenng.cam
SOIL LOG - PERCOLATION TEST
LEGAL DESCRIPTION: Tl 2N R3W SECTION 21 LOT 12
PERFORMED FOR: _
DEPTH
WESTON NASH
(feet)
DATE
ORGANICS
1
161111wII
7/6/2018
2
10/4/2018
LOAM
3
..�.
IIII"I'I
•
5
6
7
8
9
10
11
12
13
14
15
16
17
18
GP TO SP
SIDEWALLS HELD
DURING CONSTRUCTION
DATE: 6/28/2018
TEST HOLE #2
SOIL CLASSIFICATIONS
DEPTH TO
GROUNDWATER
DATE
111111111
am
161111wII
7/6/2018
DRY
10/4/2018
..�.
IIII"I'I
DEPTH TO
GROUNDWATER
DATE
DRY
6/28/2018
DRY
7/6/2018
DRY
10/4/2018
SITE PLAN
DATE READING CLOCK NET TIME I WATER LEVEL I NET DROP
TIME (MINUTES) READING (INCHES)
6/29/2018 ABSORBED 5 GALLONS IN -1.5 MINUTES (FASTER THAN 1 MIN/INCH)
19 PERCOLATION RATE <1 (MIN./INCH) PERC. HOLE DIA. _
TEST RUN BETWEEN 4 FT. AND 5 FT.
20 A FOUR HOUR PRESOAK WAS PERFORMED: ❑ YES NO
SOILS LOGGED BY: JODY MAUS PERCOLATION TEST PERFORMED BY: ERIK WIDGER
COMMENTS: PERCOLATION READINGS ARE WITHIN 1/16 OF INCH.
PERFORMED BY GEG, Ltd. I, JEFFREY A. GARNESS, CERTIFY THAT THIS WAS PERF RME IN ACCORDANCE
WITH ALL STATE AND MUNICIPAL GUIDELINES IN EFFECT ON THIS DATE: o
6 (INCHES)
GARNESS ENGEN EERING GROUP, Ltd
EN ,INEERIN , SAI FS - ('ONSI t TIN — -- -
3701 E. TUDOR ROAD, SUITE 101 -ANCHORAGE. AK 99507 -PHONE (907) 337-6179 -FAX (907)338-3246 'WEBSITE:-gamessengineenng.com
SOIL LOG - PERCOLATION TEST
LEGAL DESCRIPTION: Tl 2N R3W SECTION 21 LOT 12
PERFORMED FOR: WESTON NASH DATE: 6/28/2018
DEPTH
(feet)
11111"'1
DRY
ORGANICS
VZZZA
%�710f,y
Hull •
111111111
10/4/2018
1
�yp�i
0111111
-
2
3:22
LOAM
2-
3"
3
3:22
-
6"
3-
34567sSM
4
3:52
30
4-
3"
5
3:52
5-
6"
-
6
6-
30
3"
3"
7-
8—
SM TO ML
9
W/SOME GRAVEL
10
11
12
13
14
15
B.O.H.
16
17
18
TEST HOLE #3
SOIL CLASSIFICATIONS
•
11111"'1
DRY
11311,91
VZZZA
%�710f,y
Hull •
111111111
10/4/2018
��YYYZ
�yp�i
0111111
-
2
DEPTH TO
GROUNDWATER
DATE
DRY
6/28/2018
DRY
7/6/2018
DRY
10/4/2018
2:52
-
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SITE PLAN
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N
SCALE:
DATE
READING
CLOCK
TIME
NET TIME
(MINUTES)
WATER LEVEL
READING
NET DROP
(INCHES)
6/29/2018
1
2:52
-
6"
-
2
3:22
30
3"
3"
3
3:22
-
6"
-
4
3:52
30
3"
3"
5
3:52
-
6"
-
6
4:22
30
3"
3"
19 PERCOLATION RATE 10 (MIN./INCH) PERC. HOLE DIA. _
TEST RUN BETWEEN 3 FT. AND 4 FT.
20 A FOUR HOUR PRESOAK WAS PERFORMED: ❑ YES NO
SOILS LOGGED BY: JODY MAUS PERCOLATION TEST PERFORMED BY: ERIK WIDGER
COMMENTS: PERCOLATION READINGS ARE WITHIN 1/16 OF INCH.
PERFORMED BY GEG, Ltd. I, JEFFREY A. GARNESS, CERTIFY THAT THIS WAS PERFORMED IN ACCORDANCE
WITH ALL STATE AND MUNICIPAL GUIDELINES IN EFFECT ON THIS DATE: Il: a ,
6 (INCHES)
GARNESS ENGINEERING GROUP, Ltd
- ___ __-I ENGINEERING SALES 2 CONSULTING
3701 E. TUDOR ROAD, SUITE 101 *ANCHORAGE. AK 99507 -PHONE (907) 3376179 -FAX (907) 338-3246 - WEBSITE: vxiw.gamessengineenng. m
SOIL LOG - PERCOLATION TEST
LEGAL DESCRIPTION: Tl 2N R3W SECTION 21 LOT 12
PERFORMED FOR: _
DEPTH
WESTON NASH
(feet) ORGANICS
1
LOAM
2-
34567 3-
4-
5-
6-
7
$ SM TO ML
W/SOME GRAVEL
9-
10
11
12
13
14
B.O.H.
15
16
17
18
19
DATE: 6/28/2018
TEST HOLE #4
SOIL CLASSIFICATIONS
•
111111111
T (WEEP)
6/28/2018
II�III!11
��/moi
DRY
10/4/2018
NNE
111111111
MORI
-
'll ME
� y
.S1Y51Y
01+1p111.1
���
•
30
3.875"
2.125"
DEPTH TO
GROUNDWATER
DATE
T (WEEP)
6/28/2018
13'
7/6/2018
DRY
10/4/2018
2:52
-
SITE PLAN
1" = 100'
DATE
READING
CLOCK
TIME
NET TIME
(MINUTES)
WATER LEVEL
READING
NET DROP
(INCHES)
6/29/2018
1
2:52
-
6"
-
2
3:22
30
3.875"
2.125"
3
3:22
-
6"
-
4
3:52
30
3.75"
2.25"
5
3:52
-
6"
6
4:22
30
3.75"
2.25"
PERCOLATION RATE 13.3 (MIN./INCH) PERC. HOLE DIA. 6 (INCHES)
TEST RUN BETWEEN 4 FT. AND 5 FT.
20 A FOUR HOUR PRESOAK WAS PERFORMED: ❑ YES NO
SOILS LOGGED BY: JODY MAUS PERCOLATION TEST PERFORMED BY: ERIK WIDGER
COMMENTS: PERCOLATION READINGS ARE WITHIN 1/160F INCH.
PERFORMED BY GEG, Ltd. I, JEFFREY A. GARNESS, CERTIFY THAT THIS WAS PER ORM D IN ACCORDANCE
WITH ALL STATE AND MUNICIPAL GUIDELINES IN EFFECT ON THIS DATE: p Z�/