HomeMy WebLinkAboutPROSPECT HEIGHTS #4 BLK 2 LT 14MUNICIPALITY OF ANCHORAGE
Development Services Department Phone: 907-343-7904
On-Site Water & Wastewater Section Fax: 907-343-7997
Pump Installation Log
Well Drilling Permit Number: _______________ Date of Issue: ____-____-____
Parcel Identification Number: ____-____-____
Legal Description Block Lot Property Owner Name & Address:
Pump Installation Date: _____-_____-_____
Pump Intake Depth Below Top of Well Casing: __________ feet
Pump Manufacturer’s Name: ___________________________ Pump
Model: _____________________________________
Pump Size: ____________hp
Pitless Adapter Burial Depth: _________ feet
Pitless Adapter Manufacturer’s Name: _________________________
Pitless Adapter Installer: ____________________________
Well Disinfected Upon Completion? XX Yes No
Method of Disinfection: _____________________________
Comments:
Pump Installer Name: __________________________________
Company: ___________________________________________
Mailing Address: ______________________________________
City: ___________________ State: __________Zip: _________
Attention: The pump installer shall provide a pump installation log to On-site within 30 days of pump installation.
September 23, 1997
Municipality of Anchorage
Department of Heath & Human Services
825 "L" Street
Anchorage, AK 99502-0650
Subject: Lot 14, Block 2, Prospect Heights No. 2"Subdivision
Septic System Design
Impacts to Adjacent Properties
Dear On Site Services Engineer:
We are hereby applying for a permit to construct a well and septic system
on the subject lot. The lot is currently vacant and the owner intends to
construct a four bedroom home on the property this year. The attached
Site Plan shows the area where the new and alternate absorption trenches
are to be placed. It also shows the location of the new well.
The testholes placed in the area of the proposed absorption trenches
revealed silty gravel with percolation rates between 11 and 17 minutes
per inch. No groundwater was encountered in Testhole No. 3 which is
closest to the absorption trenches, but water was noted in Testhole No. 2
at a depth of 10'. We are therefore proposing placement of two 50' long by
5' wide by 4' effective depth absorption trenches for disposal of septic
effluent. 3' of cover will be placed over the trenches once construction is
complete to prevent freezing. The maximum depth of the trench will be 6'
below the ground surface. A splitter valve will be placed to equally
distribute effluent to the two trenches.
The ground surface of the lot slopes from east to west at grades of from
12% to 25%. The absorption trench will be constructed parallel to the
ground contours consistent with Municipal requirements. We are confident
the trenches can be suc, cessfully placed on this lot.
A stream crosses the lot from east to west and all components of the
septic system will be placed a minimum distance of 100' from this
'Lot 14, Block 2, Prospect Heights No. 2 Subdivision
September 23, 1997
Page Two
stream. In addition, the owner of the house intends to place footing drains
around the house to protect the foundation. This drain will be developed
into a curtain drain to also protect the absorption trenches. The septic
tank and trenches will be constructed a minimum of 20' down slope from
the curtain drain.
If the system is constructed as designed the following statements apply:
1. The system, if constructed as designed, will have no adverse impact
on the wells in the area or those to be constructed in the future.
The system, if constructed as designed, will have no adverse impact
on existing septic systems in the area or those to be constructed in
the future.
The system, if constructed as designed, will have no adverse
impact on reserved space, either surface or subsurface, on any lots
located in the area.
on drainage patterns
be maintained.
The system, if constructed as designed, will have no adverse impact
in the area. The current drainage pattern will
Sincerely,
Michael E. Anderson, P.E.
Attachments
.~ -' . . .~t
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...~~:..--:-s,oo,~o~.- _~._,._
SCALE 1" = 100'
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Lot 14, Blk.
JOB -
SHEET NO,.,
CALCULAI~ED BY
CHECKED BY--
SCALE.
Prospect Hghts.
Subd. No./~
DATE' ~/~/~ ~
DATE
PROPOSED
WELL
=,SITE PLAF,
SOALE 1" = 50'
.t
SEPTIC TANK
DOWNSTREAM FROM CURTAIN DRAIN
FLOW spLITTER
VALVE
~- 50' X ~; WIDE X 4'
EFFECTIVE DEPTH
ABSORPTION TRENCHES
ROM ~ROPERT¥ LINE ,. . . PROPERTY LINE
'SYSTEM PLAN
SCALE 1' = 20'
LOT 14, BLOCK 2, PROSPECT HEIGHTS
SUBDIVISION NO. ~
DESIGN FACTORS: ~ SYSTEM REQUIREMENTS:
Four Bedroom Home
Perc. Rate: 17 Min./Inch
Application Rate: .6 GPD/SF
Wide Trench System
1,250 Gallon Septic Tank
4'. Drainfield Rock
4 Bedrooms X 150 GPD / .6 GPD/SF' = 1,000 SF of Absorption Area
1,000 SF/$ SF(Width) X .5 (Red. Factor) -- 100 LF Trench Length
Therefore: Construct 'a Wide Absorption Trench System With Two
Laterals Each 50' in Length with 4' of Drainfield Rock Beneath the
Lateral. Distribution Pipe in Trenches Placed at 2.0' Below the Original
Ground Surface. Mound Over Trenches to Provide 3.0' of Cover or
Provide 2" of Direct Bury Insulation.
NOTE:
TypiCAL wIDE TRENCH
(.o SC L )
Grade Area Over Trench to Drain Away
Minimum 3' of Cover over Seatic Svst;m
Minimum 4 Separation From Groundwater.
Municil~lily of Anchorage
DEPARTMENT OF HEALTH & HUMAN SERVICES
825 "L" Street, Anchorage, Alaska 99502-0650
SOILS LOG -- PERCOLATION TEST
PERFORMED FOR:__
LEGAL DESCRIPTION: Lot '~ 4 ~, S.].k. 2
Prospect .ghts.
1
AOR~AGF SYSTEMS, INC.
DATE PERFORMED:
Township, Range, Section:
Subd. #~ ELOPE
II, I
SITE PLA'~'-'--"--
WAS GROUND WATE~
ENCOUNTERED?
IF YE~. AT WHAT
' TH T T IS TEET WAS PERFO
CORDANCE WITH ALL STATE AND MUNICIPAL GUIDELI ........... ' ~-~ I~ RMED IN
r~r.~ I~ ~:PPECT ON THI TE: /~7
'~'~ ~"ev. 4/.~) · . S DATE. DA
Municipality of Anchorage
DEPARTMENT OF HEALTH &'HUMAN SERVICES
825 'L" Street, Anchorage, Alaska 99502-0550
SOILS LOG -- PERCOLATION TEST
PERFORMED FOR: ACREAGE SYSTEMS,
LEGAL DE.eCRIPTION:.T.ot 1 4 r B.].k. ~
! N.C.
I0,
12
15
Prospect Hgts. Subd.#~.
.1
DATE PERFORMED:
WAS GROUND WATER
ENCOUNTERED? .
Township, Range, Sectiom
SLOPE
IF YES. AT WHAT pO
SITE Pi. AN
.......... ~T~Y T~T THI~ ~T WN P~FORM~ IN
ACCORDANCE ~TH ~ ~A~ AND MUNICIP~ GUID~N~ IN ~FECT ON THIS DA~ DA~ ' ~/~/~ 7
F~AND [=1'
TEST RUN BETWEEN
Rmdlng ' Da~ Grm~ Net Dm~n to Net
'rime Time Wat~ Dine
.-j
Municipality of Anchorage
DEPARTMENT OF HEALTH & HUMAN SERVICES.
825 "L" Street, Anchorage, Alaska 99502-0650
SOILS LOG -- PERCOLATION TEST
PERFORMED FOR:
LEGAl. DESCRIPTION:
ACREAGE SYSTEHS, ]NC.
T.ot 1 4, Blk. 2 Township, Flange,
Prospect Hgts. Subd.#~ SLOPe
SITE PLAN
WAS GROUND WATER x /
ENCOUNTERED? -, /V
,P¥~.^'rw.^'r · , I ~~
r.~.~.,~~~;/~,/~ I ! I t I I I
PERCOLATION RATE' . .
~ RUN B~
J e Immule~m~fl) PERC HOLE DIAMETER
ON-SITE WASTEWATER DISPOSAL SYSTEM
CONSTRUCTION AND MATERIAL SPECIFICATIONS
SUBJECT: LOT 14, BLOCK 2, PROSPECT HTS. NO. ~ SUB.
GENERAL:
1. The scope of this project includes the procurement and
placement of a new 1,250 gallon septic tank and the
construction of two new 50' long by 5' wide by 4' effective
depth absorption trenches. The distribution pipe in the
trench to be placed 2.0' below the existing ground surface.
Total depth of the absorption trench will be 6' below the
existing ground surface. Mounding over the trenches to
provide 3' of cover or 2" of direct bury insulation will be
required.
2. Construction shall be in accordance with the approved site
plan, design drawings, Municipal Permit with any special
provisions or conditions, and all applicable State and
Municipal Wastewater Disposal Regulations.
3. The Contractor shall be responsible for obtaining all
underground utility locates and for the layout of the septic
system and verification of the location of ail lot lines.
4. Unless specifically agreed otherwise, the contractor shall
be responsible for final grading areas subsequently
depressed from soil settling. Property owner shall be
responsible for revegetation of affected areas unless
specifically agreed otherwise.
5. Contractors installing wastewater disposal systems must
be certified by the Municipal Department of Health and
Human Services for system installations. Owners installing
their own systems must receive prior approval from D.H.H.S.
before beginning system installation.
SEPTIC TANK INSTALLATION
1.A new 1,250 gallon septic tank must be procured from an
approved source and installed at the location shown on the
pl~n~.
Lot 14, Block 2, Prospect Heights No. ~ Subdivision
September 23, 1997
Page Two
2. A septic tank is to be constructed by a certified septic tank
manufacturer. Construction shall include two 4" cleanouts
for pumping access.
3. The septic tank shall be sufficiently bedded to prevent
settling or shifting of the tank.
4. All standpipes on the septic tank shall extend a minimum of
12 inches above final grade.
5. Tanks installed without 4' of cover shall have a minimum of
2" of direct burial insulation.
6. A foundation cleanout shall be installed one to four feet
from the building foundation. Two cleanouts are required
between the tank and the drainfield.
7. Final grading over the tank shall be such that a positive
slope exists away from the septic tank.
DRAINFIELD CONSTRUCTION:
1. The drainfield shall be constructed to the dimensions shown
on the design. The bottom of the trench shall be within 2"
of level.
2. Distribution piping must be placed level with perforations
down atop a level bed of drainfield rock. Rock should then
be placed over the pipe to provide a minimum of 2" of cover.
3. A silt barrier or geotextile fabric must be placed between
the drainfield rock and the natural soil backfill.
4. Monitor tubes must be 4" in diameter and installed at the
locations shown on the design. The portion below ground
must be perforated.
4-
Lot 14, Block 2, Prospect Heights No. ~ Subdivision
September 23, 1997
Page Three
5. Contractor shall verify the septic tank and drainfield are a
minimum 100' away from any private water wells in the
area, 150' from a Class "C" Well or 200' from any community
well.
6. Direct bury insulation must be placed over the distribution
system if less than 3' of backfill depth is available. Finish
grade over the trench must be mounded to prevent
settlement or depressions.
7. Grade area surrounding the absorption trenches to drain
away.
8. A minimum 2' of accepting soil is required below the
drainfield rock for a 5' wide trench. Contractor shall verify
this condition prior to placement of the rock. All pockets of
unacceptable materials must be removed and replaced.
MATERIAL SPECIFICATIONS:
1. Septic tanks 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:
Cast Iron (perforated and solid), ASTM D3034 or P.V.C.
(perforated and solid), ASTM F810 or H.D.P.E. (perforated,
but not solid) and ASTM D2662 or A.B.S. (perforated and
solid).
3. Insulation shall be at least 2" thick extruded direct burial
polystyrene (Dow Chemical Co. Styrofoam HI or equal).
4. Septic tank inlets and outlets shall be fitted
watertight couplings (Caulder, Fernco, or equal).
with
4
Lot 14, Block 2, Prospect Heights No. ~ Subdivision
September 23, 1997
Page Four
5. A permeable geotextile fabric (Typar, Mirafi or equal)must
be installed between the final drain rock layer and the
native soil layer.
6. All drain rock shall be .5" to 2.5" in diameter with less than
3% passing the #200 sieve.
INSPECTIONS:
A minimum of two inspections are required by Municipal
Ordinance. These inspections must be conducted under the
supervision of a professional engineer registered in the State
of Alaska. The first inspection must be conducted after the
excavation of trenches, beds or pits and before the installation
of any gravel. A septic tank may be set in place, but may not
be backfilled.
The second inspection must be conducted after the placement
of the geotextile fabric, gravel, distribution piping,
standpipes, cleanouts and insulation. No backfill should be in
place at the time of inspection.
Contractor shall provide a copy of all field survey layout and
construction notes for use in preparing the certified as-built
of the completed system.
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