HomeMy WebLinkAboutSANDHILL LT 3 Municipality of Anchorage UB
On-Site Water and Wastewater Program • (907) 343-7904 loillagee
ON-SITE WASTEWATER INSPECTION REPORT NOV 2 j 2018
•
Permit Number OSP181033 PID Number: 050-522-05
Dwelling: El Single Family (SF) ❑ Duplex(D) ❑ Multiple(SF and/or D) Project: ❑ New 0 Upgrade
Name:
Ray A. & Lori Jarvis ABSORPTION FIELD
Address ❑ Deep Trench 0 Shallow Trench ❑ Bed ❑ Mound
24864 Eagle River Rd. Eagle River, AK 99577 ❑ Other
Phone Number of Bedrooms Soil Rating Total depth from original grade
4 0.8 GPD/SF 9.2 Ft.
LEGAL DESCRIPTION Depth to pipe invert from original grade Gravel depth beneath pipe
Subdivision Block Lot 6.2 Ft. 3.0 Ft.
Sandhill 3 Fill added above original grade Gravel length
Township Range Section 2.0 Ft. 20 (Extension) Ft.
Gravel width Beds: Number of Lines Distance between lines
SEPARATION DISTANCES 5.0 Ft. Ft.
To Septic Absorption Lift Station Holding Sewer Total absorption area NumberFt.
of trenches Dist.between trenches
From I Tank Field Tank Line Ft s
Well >100' >100' N/A N/A >25' TANK Septic ❑S.T.E.P. ❑Holding ❑Other
Manufacturer Capacity
Surface Water >100' >100' N/A N/A Anchorage Tank 1250 Gal.
Material Number of compartments
Lot Line >10' >10' N/A ! N/A Steel 2
I NA
Foundation >10' >10' N/A N/A LIFT STATION
Manufacturer Capacity
Curtain Drain None Noted Gal.
Remarks Insulation was not used in this project Pump on level at Pump off level at High water alarm at
in. in. in.
*Total absorption area of full trench is 758 SF Pump make and model Electrical Inspections performed by
PIPE MATERIAL House to tank D3034- Tank to D3034
Installer drainfield
Northern Excavation Drainfield D3034 CO/MT D3034
Inspector J. Millette BENCH MARK (Assumed elevation) 100 ft
Inspection
1s' 5/24/18 2nd 5/25/18 Location and description
dates:
3'd 5/26/18 4th Top of lower level slab.
COMMUNITY DEVELOPMENT DEPARTMENT APPROVAL Engineer's Stamp
kk
Conditional Approval: Date r...kr•'' ' .c4,f.i,�
*. 49 TH /\ • *9
�
y ' Benja• chiller '
0+ �<4'... CE 12592 .•.`��/�
{ dT 11/21/18•,•' V�,�
Approved lti--r� Date l (' Z7-(� ,t���pROFESSIO'-
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Inspection Report_9-1-12.doc
i
SANDHILL LOT 3
PERMIT # OSP181033 PID # 050-522-05
N 0
O 5 > 0
N
- - 101.0 - - -
/- 95.8
95.2 1250 GAL 95.0
SEPTIC TANK
1
N'''''"— 90.9
5 98.5 FINISH GRADE NN
�� 96.5 ORIGINAL GRADE 20
0
90.3
."-------- 87.3 87.3 -------.4.'
68' I 20
EXISTING TRENCH NEW EXTENSION
80.5
= NO GROUNDWATER 4/23/18
I—
l
*. 49 TH )•1 .0
7..-:* .</j:-.
. Benja In Schiller
PROFILE AS-BUILT �i���;slq CNov E22�94 �••�,;,-
(NO SCALE) ll>>�\\"`�4
SAN DH I LL LOT 3
S' PERMIT # 0SP181033 PID # 050-522-05
\ \
\ \ � -
I • ---, � y ,
NI .40'ACCESS \ ` \ \ `
EASEMENT —�/ \ \
/ \
\ / . \ ` .... / . \\ \
/�l ` / / \ \� \ \\ II
/ \\ \ `\ \ \\
.„
NEW 1250-GAL SEPTIC TANK •\I ; , \ \
/ •
\ N. \ \ -� „ \,
N
__ _ _ _ .. \ ,,
LOT 1 \
FC•<Q
coi ZCQ•��Vt <'
4-BDRM HOME EXISTING WELL \ \
N,T4... / \ \ \
EXISTING 68 LF x 5'WIDE x 3' :
EFFECTIVE SEPTIC TRENCH 1H#40 • N \
• TH 1 �:.•• • N 15'LANDSCAPE
ALTERNATE SITE:CAT III SYSTEM > BUFFER EASEMENT
14 LF x 5'WIDE x 3'EFFECTIVE �' ` \ ---..- — —
CO2 r — —
.�• .o•.. •
MT2
\-
, 20L•F EXTENSION T.0 0
\ \ EXISTING TRENCH •
TH02
A B
\ FCO 2.8 46.6_
SV1 12.1 54.9
15'UTIL EASMENT )4 �' - SV2 19.4 57.9
2C0 22.2 59.2
LOT 3- - C01 53.9 88.1
MT1 54,9 88.0
CO2 71.8 33.0
LOT 4
LOT 2 MT2 73.6 35.1
WELL>100'FROM PROPERTY LINE
NOTE: '
O• F!4L..,9 0 ALL WELLS ON SURROUNDING LOTS WITH IMPACTS TO THIS LEGEND
,igtP• `4 �,9 11 PROPERTY ARE SHOWN.NO CONFLICTS WITH WELLS OR SEPTIC CO.CLEANOUT
*: 49 TH /\ *r, SYSTEMS. 200-DOUBLE CLEANOUT
• / FCO-FOUNDATION CLEANOUT
OA' AFS-FLOW SPLITTER VALVE
" Benj in Schiller5 MH MANHOLE
0'�F,/•. CnE 2T 0 50 100 MT-MONITORING TUBE
MI MI I♦ FEET SV-SEPTIC VENT
,l�iF�PROFESSIO�, 1°=50'
\\Xx��- TH-TEST HOLE
MUNICIPALITY OF ANCHORAGE ,-;.--.4, ,q� l+
DEVELOPMENT SERVICES DEPARTMENT *�49 TM �; ..A
4700 ELMORE ROAD ANCHORAGE, AK 99519-6650 / ,
SOILS LOG AND PERCOLATION TEST / �
8enja in Schiller ' /
4,fc'''. CE 12592 •A44,%
4 Ifl'., Ploy 2.2018 `'�
LEGAL DESCRIPTION: SANDH ILL LOT 3 'k>1% ROFESSIC.W:c7:
PERFORMED FOR: ROY JARVIS
U, FESS
Professional Engineers Stamp:
DATE: 4/13/2018 PROJECT No.:
PARCEL ID#: 050-522-05 TECHNICIAN: J. MILLETTE
DEPTH TEST HOLE 1
(feet)
1
OB SLOPE SITE PLAN
..;:
2 ..j."';.•..,
5 _;;% .*y;': SEE SITE PLAN
:E :
• ..`
7 ',, ;`w' SANDY SILTY GRAVEL
.7 4
, '.••H•.,..-
g }:.: Y;:
9 .;j.`M.:
10
:/:::-';'•:;• ,,. WAS GROUND WATER ENCOUNTERED? NO
"•"'•`' '^•J•• IF YES!WHAT DEPTH? -
11 ` ' DEPTH OF WATER AFTER MONITORING: NONE
"_• i' �:• DATE OF MONITORING: 4/23/18
L•,ti.r4�
12 e.'—',u =;..:`
':K.... .' DATE READING GROSS TIME NET TIME DEPTH TO
NET DROP
13 : :;.•:i (MINUTES) (MINUTES) (INCHES) (INCHES)
:
14 :'!t 4/13 TEST HOLE PRESOAKED PRIOR TO TESTING:
15 v.`,' ,:.;1?ti" 1 17:04 4 a
!...:.:".•::.:::.: :; 2 17:34 30 6 2 1 4
BOH 3 17:35 4 4
17
4 18:05 30 6 a 1 s
18 5 18:0644
19 6 18:36 30 6 s 1 s
20
PERCOLATION RATE: 18.5 (MIN/INCH) PERC. HOLE DIA. 6 (INCHES)
TEST RUN BETWEEN: 5 FT. and 6 FT.
COMMENTS: MEASUREMENTS TAKEN TO THE 1/16"
• MUNICIPALITY OF ANCHORAGE ,�• •.qs it
DEVELOPMENT SERVICES DEPARTMENT *'�P�TM �77*�/
4700ELMORE ROAD ANCHORAGE, AK 99519-6650 /
SOILS LOG AND PERCOLATION TEST • Benj;in Schiller
`,04...N0,2,......",..-.`r 2 �
LEGAL DESCRIPTION: SANDH ILL LOT 3 ll\\\\\``=�4=
PERFORMED FOR: ROY JARVIS
DATE: 4./13/2 018 PROJECT No.: Professional Engineers Stamp:
PARCEL ID#: 050-522-05 TECHNICIAN: J. M ILLETTE
1)171'1I TEST HOLE 2
(feel)
I' OB SLOPE SITE PLAN
5 '!a�• SEE S TE F_AN
7 • ' ::'.:,. • SANDY SILTY GRAVEL
:
8v.
:,r
.:
l0 _►•k .'.',.• WAS GROUND WATER ENCOUNTERED? NO
f;�';:�,.`,j,.
.
`;
is,,•;{•j IF YES C WHAT DEPTH? -
11 3'i"? DEPTH OF WATER AFTER MONITORING: NONE
i )?, DATE OF MONITORING: 4/23/18
12 "`
`=';';�-4' DEPTH To
''`•
' " ' DATE READING GROSS TIME NET TIME WATER NET DROP
13 %: ;� -.�t (MINUTES) (MINUTES) (INCHES) (INCHES)
,..• /.:.sir,..
14 •q.,t ":`'•` 4/13 TEST HOLE PRESOAKED PRIOR TO TESTING:
1...-,.:!..:4".,;:::. 1 19:18/19:28 10 5 - 10 4 5 4
't:' 2 19:29/19:39 10 5- 10 4 5 4
BOH 3 19:40/19:50 10 5- 10 8 5 8
17 4 19:51/20:01 10 5 - 108 58
18 5 20:02/20:12 105- 10158
19 6 20:13/20:23 10 5 - 10 8 5 8
20
PERCOLATION RATE: 1.8 (MIN/INCH) PERC. HOLE DIA. 6 (INCHES)
TEST RUN BETWEEN: 4 FT. and 5 FT.
COMMENTS: MEASUREMENTS TAKEN TO THE I/16"
EPL A#JS
MUNICIPALITY OF ANCHORAGE _&Slit I
•
Development Services Department Phone: 907-343-7904
On-Site Water & Wastewater Section Fax: 907-343-7997
Certificate of On-Site Systems Approval r,
050-522-05 p
Parcel I.D. Expiration Date:
1. GENERAL INFORMATION
Complete legal description Sandhill Lot 3
Location (site address) 24864 Eagle River Road
Current property owner(s) Roy & Lori Jarvis Day phone
Mailing address 24864 Eagle River Road, Anchorage, AK 99577
Real estate agent Day phone
2. TYPE OF DWELLING:
• Single Family (w/wo ADU)
• Duplex
❑ Multiple Dwellings (Single Family and/or Duplex)
3. NUMBER OF BEDROOMS: 4
4. TYPE OF WATER SUPPLY: TYPE OF WASTEWATER DISPOSAL:
Private Well Private Septic Ix
Water Storage ❑ Holding Tank [—I
Community Well Community n
Public Water System ❑ Public Sewer n
Waiver request for Distance:
Received by: Date:
COSA to be released to the engineer,unless otherwise requested by the engineer.
COSA Fee $ ct!�'S .5t Waiver Fee $
Date of Payment /11.210115$ Date of Payment
Receipt Number OG(35Zb Receipt Number
COSA# D5Gl 21441 Waiver#
5. STATEMENT OF INSPECTION BY ENGINEER
As certified by my seal affixed hereto and as of the validation date shown below, I verify that my investigation, based
on procedures outlined in the Certificate of On-Site Systems Approval Guidelines for this application, shows that the
on-site water supply and/or wastewater disposal system is (are) safe, functional and adequate for the number of
bedrooms and type of structure indicated herein. I further verify that based on the information obtained from the
Municipality of Anchorage files and from my investigation and inspection, the on-site water supply and/or wastewater
disposal system is (are) in compliance with all applicable Municipal and State codes, ordinances, and regulations in
effect at the time of installation.
Name of Firm Forge Engineering Phone 907-522-7773
Address PO Box 240773, Anchorage, AK 99524
Engineer's Printed Name Benjamin Schiller, PE Date 11/20/18
...' .of!aCi�lil
i*. 49Di /� . •.* /
6. DSD SIGNATURE �•. • '�
System #1 Approved for — bedrooms i Benjark chiller :� fisi
�+ e . CE 12592 ``
System #2 Approved for bedroomsslF•, 11/20/18,••���,r
OW
9�pPROFESStiO�P„��-:
Disapproved
Conditional approval for bedrooms, with the following stipulations:
ON SITEG�
WATER AND
WASTEWATEK
1? PROGRAM 4
Arr F
By: Original Certificate Date: I
The Municipality of Anchorage Development Services Division (DSD) issues Certificates of On-Site Systems Approval (COSA) based only upon the
representations given in paragraph 5 by an independent professional civil engineer registered in the State of Alaska. The Municipality of Anchorage is
not responsible for errors or omissions in the professional engineer's work.
7. ATTACHMENTS:
COSA Checklist X Nitrate Advisory
Septic System Advisory Arsenic Advisory
Well Flow Advisory Other
COSA Checklist blue sheet
If more than 1 septic system is on the lot:
COSA Checklist# of
Structure served by this system
Certificate of On-Site Systems Approval Checklist
Legal Description: Sandhill Lot 3 Parcel ID:050-522-05
A. WELL DATA
Well type Private If A, B, or C provide PWSID# Well Log (YIN) Y
Date completed 4/23/02 Sanitary seal (YIN) Y Wires properly protected (Y/N) Y
Total depth 420 ft. Cased to 115 ft. Casing height(above ground) 24 in.
FROM WELL LOG AT INSPECTION
Date of test 4/23/02 11/19/18
Static water level 216 ft. 228 ft.
Well production 3 g.p.m. 1 •14 g.p.m.
WATER SAMPLE RESULTS:
Coliform Neg**colonies/100 mL Nitrate 0.139 mg/L
Arsenic ND ug/L Date of sample: 11/14/18 Collected by: Forge Engineering
B. SEPTIC/HOLDING TANK DATA
Tank Type/Material Septic/Steel Date installed 5/24/18
Tank size 1250 gal. Number of Compartments 2 Cleanouts (Y/N) Y
Foundation cleanout(Y/N) Y Depression over tank(Y/N) N High water alarm (Y/N) N
Date of pumping Pumper New Tank
C. ABSORPTION FIELD DATA
Date installed *5/17/02 Soil rating (g.p.d./ft2 or ft2/bdrm) 0.8 GPD/SF System type Shallow Trench
Length 68 + *20 ft. Width 5 ft. Gravel below pipe 3 ft.
Total depth 11 •2 ft. Eff. absorption area 759 ft2 Monitoring tube Y Depression over field N
Date of adequacy test 11/20/18 Results (Pass/Fail) Pass For 4 bedrooms
Fluid depth in absorption field before test 0 in. Water added 679 gal. New depth 4 in.
Elapsed Time: 1440 min. Final fluid depth 0 in. Absorption rate >= 600 g p d
None
Any rejuvenation treatment(past 12 mo.) (Y/N &type) If yes, give date
D. LIFT STATION
Date installed Size in gallons Manhole/Access (Y/N)
"Pump on" level at in. "Pump off" level at in. High water alarm level at in.
Datum Cycles tested Meets alarm&circuit requirements?
E. SEPARATION DISTANCES
WELL ON LOT TO:
Septic tank/lift station on lot >100' On adjacent lots >100'
Absorption field on lot >100On adjacent lots �100
Public sewer main >75' _ Public sewer manhole/cleanout >100'
Sewer/septic service line >25' Holding tank 100'
Animal containment areas >50' Manure/animal excrete storage areas >100'
SEPTIC/HOLDING TANK ON LOT TO:
Building foundation Property line >5 Absorption field >5
Water main Water service line Surface water 100
Wells on adjacent lots 100
ABSORPTION FIELD ON LOT TO:
Property line >10 Building foundation >10 Water main >10
Water Service line >1 Surface water 00 Driveway, parking/vehicle storage X10
Curtain drain None Noted Wells on adjacent lots >100�
F. COMMENTS
*20 feet was added to South end of field on 5/25/18 to accommodate 4 bedrooms.
**Separate sample taken for choliform on 11/26/18 after disinfecting well
G. ENGINEER'S CERTIFICATION ����VQ\\
OF Aiq\ill
I certify that I have determined through field inspections and .•� '1001
review of Municipal records that the above systems are in /jg3. `4 ''-v%
i
conformance with MOA COSA guidelines in effect on this date. %*:• 9:fl 1' ••* 6
Benjamin Schiller, PE -
Engineer's Printed Name ''�
11/26/18 ' 'PP'. ••' " " '
Date /r Benja •hiller : •/
I0 /' CE 12592 ...4 .1
•c`v//
#�FJJ�' 11/26/18 '...4
Il`it pROFESSO. ..4�+
COSA brown sheet 10-10-12.doc
\ H_ OUSE DETAIL
SCALE: 1"=20' i
\ s IIIP \
\ \ -1.5'x8.2' CANT
\ \"\ ��
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9.
\ \ £ 1,5'x4,9' CANT �0^ ,� re ti' ��
\ F�
L1O� 2 STORY RESIDENCE yes
�1" w/ WALKOUT BSMT.
\ 9 ,,,,.•-t,j
\ \ Se. \40
3.1'x3.3' DECKS ?o
\ 36 E 3 \ r _ O� ti s9 10.
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40' COMMON ACCESS E \ •• \ / °o, \ \ '+' cy o
\ \ .7,0� \
Lot 1 '' o
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C I
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`•? SEE HOUSE
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°j 1r • • DETAIL \/ \�! NOTE:
\ /� DUE TO SNOW & ICE COVER, THE
IIP �� 15' I EASEMENT Y \ DRNEWAY LOCATION IS APPROXIMATE
..a 11111k BUFFER EASEMENT /\
h
2 SEPT-C J. 8.0'x'1.5' SHED
j
PIPcS . ry'� 8.3'x12.3' SHED
\ APLOT PLAN _ AS BUILT X SCALE _1" .. 50'_ GRID SW 0262_ Project No. 18-078/55
Lot 3 y° 11500 Daryl Avenue. Anchorage, Alaska 99515-3049
\ \ 56,215 s.f. �' (907) 522-6476 Phone
Lang & Associates, inc.
, (907) 522-4625 Fox p
\\ c Professional Land Surveyors kenOlangsurvey.00m �` OFA(
jonathanOlongsurvey.com `''•' ' 9S
I herebycertifythat I have surveyed the followingdescribed property:
�� •••.'f-v0
( P P rtY i* 49� " ,\y�
LOT 3, SANDHILL SUBDIVISION (PLAT No. 93-116)'l'6.2.j..
Anchorage Recording District. Alaska, and that the Improvements situated thereon are /
3 Lot 4 within the property lines and do not encroach onto the properly adjacent thereto, that
S),, no Improvements on the property lying adjacent thereto encroach on the surveyed (/'s" KENNETH C. a0
/SS premises and that there are no roadways, transmission lines or other visible .•• ,f
Lot 2 easements on said properly except as Indicated hereon. wy, 11.11M i$ ••'1
1,%."..11.14(18
°A 520 .
Dated this the '4ti _ Day of h=,>-_, is , •.', .,••• at Anchorage, Alaska It gyp. — •• 2�,�8
1 Ro ONN,•�l'o
f It is the responsibility of the owner to determine the existence of any easements, \\`,........
covenants, or restrictions which do not appear on the recorded subdivision plot. AECC963
j
PO BOX 240773
ANCHORAGE, AK 99524
522-7773 677-7766 (FAX)
March 26, 2018
Municipality of Anchorage
Development Services Dept- On-Site Water & Wastewater Program
4700 Elmore Rd
Anchorage, AK 99507
Subject: Sandhill Lot 3 – 24864 Eagle River Road
Septic system design and permit application
Dear On-Site Services Engineer:
The home on the above lot was destroyed, and the owner intends to build a new 4-bedroom home.
There is an existing well and an approved septic system sized for 3-bedrooms, so we are submitting
this application for the upgrade of the septic system to accommodate 4 bedrooms. The attached site
plan identifies the location of the new home, septic location and alternate site, as well as the existing
well. No conflicts exist between this proposed system and any other well or septic system, whether
on this lot or adjacent lots.
The ground surface on the lot away from the road steeply at first, and then flattens out a bit. Below
the home, it slopes downhill moderately, between 15-25%, before flattening out again. The existing
system is located just downslope from the home, above the flatter area. The design is to extend this
trench to accommodate the additional load. There are no slopes greater than 25% within 50 feet
downslope of either the primary or alternate site. Drainage arrows are shown on the site plan showing
the grade and direction of flow. Stormwater drainage will not impact this septic system.
The new trench will be constructed parallel to the slope as much as possible. It will be a minimum of
100’ from all wells and surface water, and more than 5’ away from the septic tank. The alternate site
is located more than 10’ away.
Please refer to the attached test hole logs, soils lab analysis, plan and profile pages for the septic
design. If this design is followed, there will be no adverse impacts to adjacent properties.
Sincerely,
Benjamin Schiller, PE
3/21/18
Municipality of Anchorage
On-site Water and Wastewater
REVIEWED FOR CODE COMPLIANCE
OSP181033, Rebecca Carroll, 03/28/18
22.4%18.4%22.7%22.8%18.6%18.9%18.8%15' LANDSCAPE
BUFFER EASEMENT
FCO
10050 0
FEET
1"=50'
EXISTING 68 LF x 5' WIDE x 3'
EFFECTIVE SEPTIC TRENCH
4-BDRM HOME
EXISTING WELL
EXISTING 1000-GAL SEPTIC TANK
REMOVE AND HAUL AWAY
INSTALL NEW 1250-GAL SEPTIC TANK
NOTE:
NO SLOPES >25% WITHIN 50' OR SURFACE WATER WITHIN 100' OF THE
PROPOSED SEPTIC SYSTEM
ALL WELLS ON SURROUNDING LOTS WITH IMPACTS TO THIS
PROPERTY ARE SHOWN. NO CONFLICTS WITH WELLS OR SEPTIC
SYSTEMS.
CO - CLEANOUT
2CO - DOUBLE CLEANOUT
FCO - FOUNDATION CLEANOUT
FS - FLOW SPLITTER VALVE
MH - MANHOLE
MT - MONITORING TUBE
SV - SEPTIC VENT
TH - TEST HOLE
LEGEND
MT
TH#4
E
A
G
L
E
RI
V
E
R
R
O
A
D
SANDHILL LOT 3
Mar 26, 2018
EXTEND TRENCH BY 20 LF
ALTERNATE SITE: CAT III SYSTEM
14 LF x 5' WIDE x 3' EFFECTIVE
CO
CO
2CO
40' ACCESS
EASEMENT
15' UTIL EASMENT
WELL >100' FROM PROPERTY LINE
Municipality of Anchorage
On-site Water and Wastewater
REVIEWED FOR CODE COMPLIANCE
OSP181033, Rebecca Carroll, 03/28/18
SANDHILL LOT 3
5-WIDE TRENCH SECTION
(NO SCALE)
4" PERFORATED PVC (HOLES DOWN)
DRAINFIELD ROCK
5'
1'-6"
1'
3'
Mar 26, 2018
NOTES:
1. GRADE AREA OVER TRENCH TO DRAIN AWAY
2. PROVIDE 3' OF COVER OVER TRENCHES AND 4' OVER SEPTIC TANK, OR 2'
WITH 2" OF INSULATION
3. CHECK GROUNDWATER AT TIME OF CONSTRUCTION. IF LEVEL IS HIGHER
THAN PREVIOUSLY OBSERVED, CALL ENGINEER IMMEDIATELY
BOTTOM OF TRENCH: 4' BELOW GRADE
FLOW LINE ELEVATION: 1' BELOW GRADE
TOP OF TRENCH ELEVATION: 1.5' ABOVE GRADE
DESIGN FACTORS: SYSTEM SPECIFICATIONS:
4 BEDROOM: 600 GPD PEAK FLOW
PERK RATE: 12 MIN/IN
APPLICATION RATE: 0.8 GPD/SF
5' WIDE SHALLOW TRENCH SYSTEM
1250-GAL SEPTIC TANK
600 GPD / 0.8 GPD/SF / 5' WIDE * 0.58 REDUCTION = 87.5 LF TRENCH REQUIRED
68LF EXISTING TRENCH: EXTEND TRENCH BY 20LF
INSULATION
Municipality of Anchorage
On-site Water and Wastewater
REVIEWED FOR CODE COMPLIANCE
OSP181033, Rebecca Carroll, 03/28/18
REFERENCE:
GENERAL:
1.
ON-SITE WASTEWATER DISPOSAL SYSTEM
CONSTRUCTION PRACTICES
and
MATERIAL SPECIFICATIONS
Lot 3, Sandhill Subdivision
April 15, 2002
ROBERT C. COWAN. P.E.
CML ENGINEERS
(907) 694-2979
FAX (907) 694-1211
The scope of this project includes the installation of a 1000 gallon t tt:.Pl:
septic tank and dminfield to serve the proposed three bedroom residence
located on the referenced property.
Construction shall be in accordance with the approved site plan and design
drawings, Municipal permit with any special provisions or conditions, and
all applicable State and Municipal Wastewater Disposal Regulations.
The contractor shall be responsible for obtaining any necessary
underground utility locates.
Unless specifically agreed otherwise, the property owner shall be
responsible for final grading areas subsequently depressed from soil
settling.
Contractors installing wastewater disposal systems must be certified by the
Municipal Health Department for system installations. Owners installing
their own systems must also receive prior approval from the Municipal
Health Department.
SEPTIC TANK INSTALLATION:
A septic tank is to be constructed by a certified septic tank manufacturer.
Construction shall include two 4" cleanouts for pumping access.
The septic tank shall be sufficiently bedded to prevent settling or shifting of
the tank.
All standpipes on the septic tank shall extend a minimum of 12 inches
above final grade.
17034 NORTH EAGLE RIVER LOOP · SUITE 204 * EAGLE FINER. ALASKA 99577
Page 2
Lot 3, Sandhill
Ap[fl 15, 2002
4. Septic tanks installed with less than 4 fl. ofcover shall be insulated.
A foundation cleanout shall be installed one to four feet from the building foundation.
Final grading over the septic tank shall be such that a positive slope exists away from
the septic tank.
ABSORPTION TRENCH/DRAINFIELD INSTALLATION:
Excavate the proposed trench to the dimensions shown on the design. The bottom of
the excavation shall be within 2 inches of level. If the sidewalls of the excavation
become smeared, they must be raked or scratched (ruffed-up) before gravel (sewer
rock) placement.
Once the gravel is installed, the distribution pipe is to be installed level with the holes
faced downward. The distribution piping is to be of PVC (ASTM D3034 or equal).
AIl joints are to be solvent cemented. Gravel is then to be placed over the distribution
pipe to provide a minimum of 2 inches of cover over the pipe.
A silt barrier must be installed between the final gravel layer and the native soil
backfill. Ensure the silt barrier covers the entire gravel surface before placing backfill.
Monitor tubes shall be of four (4) inch diameter, installed approximately in the
locations shown on the design, and extend a minimum of 12 inches above final grade.
The portion of the monitoring tube extending through the gravel shall be perforated
from the bettom of the trench to the invert of the distribution pipe. This is equivalent
to the effective depth of the gravel as noted on the design.
Backfill over the final gravel layer must not be less than twenty-four (24) inches.
Insulation must be installed when the backfill depth is less than thirty-six (36) inches.
The finish grade over the trench must be mounded to prevent the formation of a
depression after settling.
Lot 3, Sandhill
MINIMUM MATERIAL SPECIFICATIONS:
i. Any septic tank proposed for installation must be constructed by a Municipally
approved septic tank manufacturer.
2. The following pipe materials are approved for use in septic system installations in the
Municipality of Anchorage:
Type of Pir, e Perforated Solid
Cast Iron Yes Yes
ASTM D3034 (PVC) Yes' Yes
ASTM F810 0tDPE) Yes No
ASTM D2662 (ABS) Yes Yes
Use of a type of pipe other than listed above must be approved by the inspecting
engineer.
Insulation shall be at least 2" thick, extruded direct burial polystyrene (Dow Chemical
Company Styrofoam HI or equal).
Septic tank inlets and outlets shall be fitted with watertight couplings (Caulder, Femco,
or equal).
A permeable nontoxic silt barrier (Typar 3401, Mirafi 140N, or equal) must be installed
between the final leachfield gravel layer and the native soil backfill.
All leachfield gravel (sewer rock) shall be 0.5"-2.5" screened gravel with less than 3%
passing the #200 sieve.
When sand is being used as a filter material, its gradation specifications must conform
to current M.O.A. or D.E.C. requirements, which ever specifications applies.
Page 4
Lot 3, Sandhill S/D
April 15, 2002
INSPECTIONS:
Typically there will be a minimum of three (3) inspections required during the installation of
the wastesvater disposal system. These inspections will occur as follows:
The first inspection must be conducted after the excavation of ditches, pits,
trenches, or beds and before the installation ofany gravel. A septic tank may be
set in place, but may not be backfilled before this inspection.
The second inspection must be conducted after the placement of the silt barrier,
grovel, distribution lines, standpipes, cleanouts, and insulation, but before the
placement of any other backfill.
3. The final inspection is to occur upon final grading ofthe property.
Often there will be more than these 3 inspections required. Especially with the installation of
multiple trenches, sand filters, pressurized distribution systems, etc. Thus, the inspecting
engineer is to be contacted at least 24 hours prior to the start of construction. If necessary, a
pre-construction meeting will take place on-site. The inspecting engineer will not coordinate,
direct or control in any way the contractors activities.
The owner shall contract with the contractor to perform the work outlined in these
specifications and plans and in accordance with the attached M.O.A. permit. There will be no
contractual arrangement existing between the contractor and S & S Engineering. S & S
Engineering shall be the oxvner's representative and will inspect the xvork as stated above to
document the contractors activities. Final acceptance of the contractors work rests with the
owner and the M.O.A.
S & S Engineering shall have no liability to the owner or to others for acts or omissions of the
contractor or any other persons performing work on this project or the failure of the contractor
to carry out the work in accordance with these construction documents. S & S Engineering's
inspecting engineer will not be responsible for the construction means, methods, techniques,
sequence, procedures or the safety precautions incident to this project.
CONTRACTOR / INSTALLER