HomeMy WebLinkAboutCOHOE LT 5
Municipality of Anchorage Page
DEPARTMENT OF HEALTH AND HUMAN SERVICES
ENVIRONMENTAL SERVI'CES DIVISION
P.O. Box 196650 · Anchorage, Alaska 99519-6650 · Telephone: 343-4744
On-Site Wastewater Disposal System and/or Well Inspection Report
Permit Number: -~/,0' 95'0 P_t y PID Number: o 15'o5'11 "'l
Name: Wastewater System: Q New ~ Upgrade
*UUr~,~: ABSORPTION FIELD
Phone: ~ K '~ Z Y~ [ No. of Bedrooms:
~ ~ Deep Trench ~ Shallow Trench ~ Bed ~ Mound ~ Other
Total Depth from original grade:
LEGAL DESCRIPTION SoilRating: ~', ~5' GPD/Sq. Ft.
Lot: ~ Block:-- Subdiv~ion:~o~O~ Depth to pipe bottom~,~from original grade: Ft. Gravel depth~,j~beneath~,o~pipe Ft.
Township: I Range: I Section: Fill added above origlna[grade: Gravel length:
~ Ft. ~ ~ ~ ~' ~ /~0 ~Ft,
I
I
WELL: ~N, ~.~ Q New ~ Upgrade Gravelwidth: Number of lines: 1Oistancebetweenl[nes:
Classification (Private, A,B,C): Total Depth: Cased To: Total absorption area: Pipe material:
Driller: Date Drilled: Static Water Level: Installer: Date installed:
Yield: GPM J.um. Se,~: F,. Icasing He'ghtAb°v. Gr°u"u:Ft. TANK
SEPARATION DISTANCES ~ s.pti~ ~ Ho,~ing ~ S.T.E.,.
TO Septic Absorption Lift Holding Public/PrivateManufacturer: Capacity in gallons:
From Tank Field Station Tank ' Sewer Lines ~ ~ ~ ~ ~ ~ /
Material: Number of Compartments:
Surface LIFT STAT I 0 N
Lot Size in gallons: ~ Manufacturer:
I
Curtain Pump Make & Model I Electrical Inspections performed by:
Drain
Remarks: ~c ~n~ m~c~ ~ ~n~ ~ BENCH MARK
~ ~1 ~ ~ ~ (O~'~,~u~j ~ ~ ~ Location and Descriptio~
Inspections performed by: W/aArp Wech f~r Dates: 1st p/ /~/gs' ~ w p ~= ~' ~ . '~.: '~
Reviewed and approved ~¢ ] rV ~v~ Date:
~ ~ , .... V ~:'
72-013 (Rev. 9/91) MOA 25
PERMIT NO: SW950214 PAGE 2 OF 2
PID NO: 01505117
~ FROM: COR."A" COR."B" COR."C" /
/
SWING TIES
TO"
M.T. "E" 46' 43.5'
-- C.O. "F" 78' 47' ~ STRUTZ
C 0 "G" 77' 84'
T.H. M~T~ "H" 75.5' 82' ~ AVENUE
. ~ ORIGINAL \ \
"F"~ '~-TRENCH ~"B'' 4BDRM~ IL'- ~
TRENCH ~o. "BULL RUN"
o~,.,,~,, X~,~,~ ~ ~_mv~RL~E~,~ HOUSE X LOTS
Or-%~lVlr-,~l I_.~.,~ X ~, XVALVE'I"
WITH 8.1' ~,~ '~,,,,~.c--~
IT') WITH 9,o' GRAVEL INSPECTED AND FOUND TO BE OKAY
IL_
PLAN VIEW
SCALE: 1" = 30' - 0"
/ 27' TRENCH
SEGMENT T.H. #1 "
ELEV, 84.2 M,T. DRY ~"~J'
18' B.G.L
PROFILE VIEW
NOT TO SCALE
EXISTING FIBERG~SS
SEPTIC TANK
LOT 5, COHOE S/D
SEPTIC SYSTEM UPGRADE
AS-BUILT INSPECTION REPORT
FLATTOP TECHNICAL SERVICES SCALE: AS-SHOWN
14530 ECHO STREET DRAWN BY TFM
ANCHORAGE, ALASKA 99516 OCTOBER. 1995
PAGE 1 OF 1
MUNICIPALITY OF ANCHORAGE
DEPARTMENT OF HEALTH AND HUMAN SERVICES
P.O. BOX 196650, 825 "L" STREET, ROOM 502
ANCHORAGE, ALASKA 99519-6650
ON-SITE WASTEWATER DISPOSAL SYSTEM (UPGRADE) PERMIT
PERMIT NUMBER:SW950214
DESIGN ENGINEER:FLATTOP TECHNICAL SERVICES
OWNER NAME:EDMONDSON TIMOTHY L & KAREN A
OWNER ADDRESS:9360 STRUTZ AVE
ANCHORAGE, AK 995=7
PARCEL ID:01505117
DATE ISSUED: 8/11/95
EXPIRATION DATE: 8/11/96
LEGAL DESCRIPTIOM:
COHOE LT 5
LOT SIZE: 19017 (SQ. FT.)
NUMBER OF BEDROOMS: 4 THIS PERMIT:
THIS PERMIT IS FOR THE CONSTRUCTION OF:
DISPOSAL FIELD /SEPTIC TANK SYSTEM
ALL CONSTRUCTION MUST BE IN ACCORDANCE WITH:
1. THE ATTACHED APPROVED DESIGN.
2. ALL REQUIREMENTS SPECIFIED IN ANCHORAGE MUNICIPAL CODE CHAPTERS
15.55 AND 15.65 AND THE STATE OF ALASKA WASTEWATER DISPOSAL
REGULATIONS (18AAC72) AND DRINKING WATER REGULATIONS (iSAAC80) .
3. THE ENGINEER MUST NOTIFY DHHS AT LEAST 2 HOURS
PRIOR TO EACH INSPECTION. PROVIDE NOTIFICATION BY
CALLING 343-4744 ( 24 HOURS ) (NOT REQUIRED FOR WELL ONLY PERMIT)
4. FROM OCTOBER 15 TO APRIL 15 A SUBSURFACE SOIL
ABSORPTION SYSTEM UNDER CONSTRUCTION DURING FREEZING
WEATHER MUST BE EITHER:
A. OPENED AND CLOSED ON THE SAME DAY
B. COVERED, SEALED AND HEATED TO PREVENT FREEZING
5. THE FOLLOWING SPECIAL PROVISIONS.
SPECIAL PROVISIONS:
CIVIL & ENVIRONMENTAl, ENGINEERING * ENERGY CONSERVATION & ANALYSIS
THEODORE F. MOORE, P.E. 14530 ECHO ST.
PH: (907) 345-1355 August ?, 1995 ANCHORAGE, ALASKA 99516
M.O.A. DHHS
P.O. Box 19-6650
Anchorage, AK 99519
Dear Sirs:
The purpose of this letter is to provide the required design narrative in support of our application for a
permit to upgrade the wastewater disposal facilities on Lot 5 of Cohoe S/D, located at 9360 Strutz Avenue.
The present soil absorption trench is no longer able to accept the effluent emanating from the residence.
Soils logs, perc test results, a site plan, design drawings and specifications are enclosed for your review.
The proposed system will be constructed between test holes/ti and #2. As can be seen from the soil
log for test hole #1, the native material between 3.5' and 18' below ground level is a gravelly silt with a
perc rate of 20 minutes per inch. Because the permeability of this stratum is quite variable, we have
designed the soil absorption trench on the basis of a perc rate of 60 minutes per inch which correlates to a
soil application rate of 0.45 gpd/square foot. Thus, this 4 bedroom residence requires a total absorption
area of (4 x 150)/0.45 = 1334 square feet. The proposed trench has been designed for maximum
utilization of the readily available area and has a total effective absorption area of 1600 square feet.
The topography of the lot slopes gently towards the west at approximately 2%. Test hole #1 has a total
depth of 18 feet and the monitor tube was dry two weeks later, despite several days of rain and the fact that
the test hole excavation had not been completely backfllled. In the course of excavating test hole g2 to
verify the continuity of soils in that area small seeps of septic tank effluent were encountered at
approximately 12 feet. The monitor tube in for this test hole did accumulate some fluid at the 13 foot
depth, however this appears to be effluent from the existing septic system rather than groundwater.
The lots in this subdivision and the adjoining Hanshew Heights subdivision are served by community
water systems for which the wells are greater than 200 feet away.
The proposed project will have no significant impact on present or futm'e water supply and wastewater
disposal systems serving adjacent properties, nor will it have any significant impact on reserved space-
surface and subsurface, or on drainage.
Please give me a call at 345-1355 if you have any questions on this submittal.
Ted Moore, P.E.
O
SEPTIC
SYSTEM
O
O
LOT 3
LOT 4
ILl
LOT8 I ~-
LOT 7
LOT 4E ) ~k_
HANSHEW HTS. ~-EXISTING SOIL ABS. TRENCH ~,
SYSTEM ~'
, ' LOT 5
HANSHEWHT. ~ ' ~.H. - ~ ,,.'
DIVERTER VALVE- ¢1 %NEW 1250 GALLON SEPTIC TANK
UNDEVELOPED LAND
LOT 5, COHOE S/D
SEPTIC SYSTEM UPGRADE
SITE PLAN
FLATTOP TECHNICAL SERVICES
14530 ECHO STREET
ANCHORAGE, ALASKA 99516
1 INCH = 4O FEET
DRAWN BY TFM
AUGUST, 1995
NOTE: THIS IS NOT A SURVEYED PLAT.
ALL LOCATIONS SHOWN ARE APPROXIMATE.
OF TRENCH EXCAVATION
CLEANOUT
(TYPICAL)
4" DIA. ASTM
F-810 PERF PIPE
DIA. ASTM D-3034 PIPE
MONITOR
"A"
NEW 1250 GALLON
SEPTIC TANK
PLAN VIEW
SCALE: 1" = 15' - 0"
MONITOR TUBE
.CLEANOUT
-- MOUND BACKFILL 12"
GROUND
-- BACKFILL MATERIAL
-- FILTER FABRIC
DIA. F-810 PERF. PIPE
-- 1/2" - 2 1/2" SEWER GRAVEL
OFTRENCH
SECTION "A - A"
SCALE: 1" = 5'- 0"
LOT 5, COHOE S/D
SEPTIC SYSTEM UPGRADE
PLAN AND CROSS-SECTION
FLATTOP TECHNICAL SERVICES
14530 ECHO STREET
ANCHORAGE, AK, 99516
SCALE: AS SHOWN
DRAWN BY: TFM
AUGUST, 1995
Flattop Technical Services
14530 Echo Street, Anchorage, AK99516
Phone (907) 345-1355
Lot 5, Cohoe S/D
9360 Strutz Avenue
Wastewater disposal system installation
Specifications
1.0 General:
1.1 The scope of the project consists of installation of a new 1250 gallon septic tank followed by 100
lineal feet of soil absorption trench containing a total of 8.5 feet of sewer gravel.
1.2 Construction shall be as depicted on the approved site plan'and design drawings. Minor
deviations from these drawings may be allowed or required by the engineer conducting the inspections.
All construction procedures and material specifications shall confmzn with Municipal and State
requirements. All separation distances shall be in conformance with Municipal requirements, unless
specifically waived.
1.3 The contractor shall be responsible to obtain any necessary utility locates, and to work around any
buried utilities.
1.4 The contractor shall provide adequate cover material and rough grading over all system
components to ensure that proper drainage is achieved after settlement and that there are no residual
depressions. Insofar as possible the contractor shall minimize damage to trees and existing lawn areas.
1.5 Unless specifically agreed otherwise, the homeowner shall be responsible for finish grading after
the soil is compacted, as well as placement of topsoil and reseeding all areas disturbed by the construction.
1.6 The property owner shall be responsible for determining the location of property lines so as to
achieve the required 10 foot separation distance.
2.0 Septic Tank:
2.1 The existing septic tank may be retained in service, only if it's structural integrity has been verified
by the inspecting engineer, and if it has functional cleanout pipes with airtight caps, allowing pumping
access to each compartment. Any existing septic tank or seepage pit which is not retained in service must
be properly abandoned by thoroughly pumping, removing the top and backfilling with soil.
2.2 The new 1250 gallon, 2 compartment septic tank shall be Municipally approved and shall be set
level on undisturbed soil. Each compartment shall be equipped with a watertight manhole cover and a 4"
cleanout. If the tank is buried less than 4 feet, it shall be insulated with 2 inches of approved burial type,
rigid insulation.
2.3 All pipe connections to the tank shall be equipped with waterproof mechanical couplings. The
waste line from the residence to the septic tank shall have a minimum slope of 1/4'" per foot, and the waste
line between the tank and the soil absorption system shall have a minimum slope of 1/8" per foot. A
cleanout shall be installed within 5 feet of the building foundation, and a double cleanout shall be installed
within 5 feet downstream of the septic tank.
2.4 A "Bull Run" diverter valve shall be installed downstream of the septic tank allowing subsequent
reconnection to the original U'ench at a future date, if desh'ed.
3.0 Soil absorption system:
3.1 The soil absorption system shall be constructed by excavating 100 lineal feet of soil absorption
trenches to a depth of 12 feet below original ground level in the vicinity of test hole :gl. The exact
orientation of the trenches shall be field adjusted to minimize damage to existing U'ees.
3.2 The bottom of the excavation shall be level. Any compacted or smeared surfaces shall be raked to
promote maximum infiltration.
3.3 A total of 8.5 feet of approved sewer gravel shall be placed in the bottom of the excavation with
the perforated disu'ibution pipes'laid level such that the pipe inverts are no less than 8.0 feet above the
bottom of the sewer gravel. Sewer gavel shall be 0.5" - 2.5" screened gravel, with less than 3% passing
the #200 sieve.
3.4 Monitor tubes and cleanout pipes shall be of 4" diameter and installed in the locations shown on
the design drawings. The portion of the monitor tube extending through the sewer gravel shall be
perforated.
3.5 Approved filter fabric shall be placed over the entire top surface of the sewer gravel. A minimum
of 2 feet of soil cover is to be placed over the filter fabric. If the soil cover thickness is less than 3 feet,
two inches of rigid, burial type insulation is to be placed over the entire top surface of the gravel, in
addition to the filter fabric.
3.6 The top surface of the cover material shall be raised a minimum of 12 inches higher than the
surrounding terrain to allow for subsequent settlement, and shall be graded to smooth contours. Fill
slopes shall be no steeper than 3:1.
3.7 Unless specifically agreed otherwise the homeowner shall be responsible for mu'anging to have the
site finish graded after the backfill material has stabilized, and for placement of adequate topsoil and seed
to promote revegetation of areas disturbed by the construction.
4.0 Inspections:
4.1 A minimum of 4 engineering inspections will be required during the course of the project: (1)
initial stakeout with the contractor to establish the location of the system and to discuss the plans,
specifications and construction procedures, (2) after the native material has been excavated to expose the
infiltrative surface to ensure that it is level and at the right elevation, and conforms with the soil test
information, (3) after the sewer gravel is in place and the distribution pipes have been laid and connected
up to the septic tank, but prior to placement of insulation or filter fabric, and (4) after rough backfill and
grading is complete. The septic tank requires one inspection after iris set level and the piping connected,
but prior to backfill. This inspection may be incorporated with any of the above inspections.
4.2 The installer shall coordinate the timing of the inspections with the engineer sufficiently far in
advance to ensure the availability of the engineer.
TEST HOLE #
LEGAL DESCRIPTION:
DATE PERFORMED:
PERFORMED FOR:
DEPTH
(feel
1
8
COMMENTS:
FLATTOP TECHNICAL SERVICES
14530 ECHO ST.
ANCHORAGE, ALASKA 99516
SOILS LOG -- PERCOLATION lEST
Lot 5~ Cohoe S/D
July 19, 1995
Tim Edmondson
Pt
SLOPE
GM Brown silty sandy gravel
ML Gray/Brown gravelly silt
Sidewalls do not smear
Becomes denser with depth
Depth to Groundwater Date
No groundwater 7/19/95
Moaitor tube dry 8/1/95
B.H.
Clock Net Time Percometer Not Drop
Date Reading Time (minutes) Reading (inches)
,7/19 12" Presoak 4:35
7/20 Start 3:13 23 9/16
#1 3:43 30 21 1/4 2 5/16
Add water 3:43:30 23 9/16
~- #2 4:13:30 30 21 11/16 1 7/8
Add water 4:14:00 23 5/8
#3 4:44:00 30 22 0/16 1 5/8
Add water 4:44:15 23 5/8
#4 5:14:15 30 22 1/16 1 9/16
PERCOLATION RATE 20 (minutes/inch) PERC HOLE DIAMETER 6"
TEST RUN BETWEEN 6.0 FT AND 6.5 FT
Recommend designing on basis of 60 minutes/inch, because another perc test at this same depth was slower than 60 rain/inch,
PERFORMED BY FLATTOP TECHNICAL SERVICES. I
ACCORDANCE WITH ALL STATE AND MUNICIPAL GUIDELINES IN EFFECT ON THIS DATE,
CERTIFY THAT THIS TEST WAS PERFORMED IN
TEST HOLE #
FLA'I-rOP TECHNICAL SERVICES
14530 ECHO ST.
ANCHORAGE, ALASKA 99516
SOILS LOG -- PERCOLATION TEST
LEGAL DESCRIPTION: Lot 5, Cohoe S/D
DATE PERFORMED: July 19, 1995
PERFORMED FOR: Tim Fdmondson
DEPTH
(feet) Pt
SM Reddish sandy loam
GM Sandy silty gravel
Dense, very hard digging
11
ML Gravelly silt
Similar to test hole #1
Hard digging
Small seeps of effluent
at east end of test hole
'~--at 12' - 13' below ground
(from original trench)
B.H.
SLOPE
Depth to Groundwater Date
No groundwater 7/19/95
Fluid at 13' b.g.1. 8/1/95
o,
T.H.
Clock Net Time Percometer Net Drop
Date Reading Time (minutes) Reading (inches)
7/20 12" Presoak
Start 4:06:30 22 1/4
#1 4:16:30 10 24 3/8 2 5/8
Add water 4:17:20 21 3/4
#2 4:27:20 10 24 1/8 2 3/8
Add water 4:28:00 22 1/4
#3 4:38:00 10 24 0/8 1 3/4
PERCOLATION RATE 6 (minutes/inch) PERC HOLE DIAMETER 6"
TEST RUN BE'I'WEEN 2.0 FT AND 2.5 FT
COMMENTS: This pew test was conducted in a shallow, hand dug. test hole located approximately 20 feet west of test hole #1,
The fluid which was monitored in this test hole is almost surely not groundwater - rather effluent from original trench. See monitoring of deeper T,H.#1
FLATTOP TECHNICAL SERVICES, I~--'~,,.,~ ~ CERTIFY THAT THIS TEST WAS PERFORMED IN
PERFORMED
BY
ACCORDANCE WITH ALL STATE AND MUNICIPAL GUIDELINES IN EFFECT ON THIS DATE. DATE:
GREA R ANCHORAGE AREA BOR( SH
Department of Environmental Quality
3330 C Street
Anchorage, Alaska 99503
INSPECTION REPORT ON-SITE SEWAGE DISPOSAL SYSTEM
NAME ~
LOCATION
MAILING ADDRESS
LEGAL DESCRIPTION
SEPTIC TANK:
DISTANCE
FROM WELL
INSIDE LENGTH
MANUFACTURER ~'UL k ~,~' .~' MATERIAL
INSIDE WIDTH ""'- LIQUID DEPTH
NUMBER OF
COMPARTMENTS
LIQUID CAPACITY/~-5~ GALLONS.
:;
DISTANCE FROM WELL ~--OO¢'¢' FOUNDATION
NEAREST LOT LINE__
TOTAL LENGTH /
OF LINES ~t... ?
NUMBER OF LINES I DISTANCE BETWEEN LINES ~ TRENCH WIDTH ~IN. TOTAL EFFECTIVE
ABSORPTION AREA t~' ~oO SQ. FT. LENGTH OF EACH LINE ~'~'/
DEPTH OF FILTER
DEPTH: TOP OF TILE TO FINISH GRADE,~.I ~ I MATERIAL BENEATH TILE (~t
~ _ 14~> ABOVE TILE ¢ IN.
WELL:
BUILDING
FOUNDATION__
CESSPOOL
APPROVED
CONSTRUCTION ~ P f)//~ U ~' ~--"J DEPTH
NEAREST
LOT LINE_
DISTANCE FROM:
OTHER SOURCES
__ DISAPPROVED--
NEAREST SEPTIC SEEPAGE
, SEWER LINE__, TANK '~d)¢~' ,-+ SYSTEM ~(~) r .iF.
REMARKS
DISTANCES:
INSTALLED BY:
SEWER LINE DEPTH:
2t .- ,.¢ /
PIPE MATERIAL:
LOT SLOPE: ~0,,.,~.
REMARKS:
Form EQ-032
DIAGRAM OF SYSTEM
DATE <~' /'~¢ h~~"'APPROvED ~ ~'~ ~
G.A.A,B.
GRE. ;R ANCHORAGE AREA Bo,, JGH
DEPARTMENT OF gNVlRONM. ENTAL QUALITY PERMIT NO.
;3330 "C" STREET ANCHORAGE, ALASKA 99503
TELEPHONE 274-456 I
C ,. .,, .., SEWAGE DISPOSAL SYSTEM APPLICATION AND PERMIT
NAME OF APPL,OANT /2,¢/¢; 15'
~ SEEPAGE "it D"AiN FIELD OTHER
INSTALLATION OF: SEPTIC TANK
SO'L TEST RESULTS ~ 4/O fl NOTE: THIS PERMIT IS NOT VALID WITHOUT SOIL TEST
FINAL INSPECTION: 24, HOUR NOTICE REQUIRED. BACKFILLING OF ANY SYSTEM WITHOUT FINAL INSPECTION BY THE
DEPARTMENT OF ENVIRONMENTAL QUALITY AUTHORITY WILL BE SUBJECT TO PROSECUTION.
MINIMUM DISTANCES, REQUIREMENTS
FOUNDATION TO SEPTIC TANK J~' [
.. SEEPAGE AREA SIZE
DIAGRAM OF SYSTEM
FOUNDATION TO SEEPAGE PIT DRAIN FIELD
SEpT,,=TANKTOSEEPAGEP,TWALLb._./' .
SEPTIC TANK ~ O '" , SEEPAGE PIT ~ O . DRAIN FIELD
TO NEAREST LOT LINE.
WELL TO SEPTlC TaNk /~ SEEPage PIT
DRAIN FIELD / ~ ALSO CONSIDER AREA WELLS.
WATER MAIN TO SEPTIC TANK /~ / SEEPAGE PIT
DRAIN FIELD
~EPTIC TANK, , SEEPAGE PIT ~ , DRain FIELD./~ / ,
TO RIVER, LAKE, STREAM.
CAST IRON INTO AND OUT OF SEPTIC TANK AND INTO CRIBCROSSING GAP Of
EXCAVATION 5 Feet intO UNDISTURBed SOIL.
4 INCH D~AmETER CAST IRON SIPHON PIPES on SEPTIC TANK AND SEEPAGE Pit
FITTED WITH AIRTight REmOVA"LE CAPS. / ~ ~] K ~
OONFORM TO BOROU6M~EGObATIONS REGARDIN~ INsTALbATION.
DESCRIBED~SY~TE Mi~[S IN__ACCORDANCE WITH SAID CODE.
DATE ~ L~ APPLICANT'S SIGNATURE -
GREATER ANCtlORAGL AREA UORUUGi,
Department of Lnvi ronlnen La] Qual i ty
3330 "C" Street
Anchorage, Alaska 99503
lhis form reports: Soils log ..... ~ Percolation 'test
' [:[~1 ' / ..
I
10-
11 -
12-
13-
Was ground water encountered? . ~ ..... If yes, at what depth?
Reading Date Gross Time
Net Time
Depth to Water Net iJrop
Pe rcol a t i o n -r-aYe- ................. inYn'u-t-e-.
,.Proposed installat]~'~-n-i'-"S-e-e~a-'.qe Pit Drain Field
De i t trenct~
Deptti of Inlet _ _ p_tlT-~'¥OYt¥"-O:f% or __
COMMENTS: ..... ~,.~. a'~::
Performed '~}-.' - - :--dE-Z'" -~a~e :--~-t-I1-t~-'.~