HomeMy WebLinkAboutSHANGRI-LA LT 9On -Site Water & Wastewater System Permit
Permit Number:
OSP131242
Tax Code Number:
02004327000
Work Type:
WellSeptic
Permit Effective Dates: July 30, 2013
MUNICIPALITY OF ANCHORAGE
Development Services Department
On -Site Water & Wastewater Program
4700 Elmore Road, PO Box 196650
Anchorage, AK 99519-6650
Telephone: (907) 343-7904
to July30,2014
Design Engineer: SPURKLAND ENGINEERING
Subdivision: SHANGRI-LA
Site Legal Address: SHANGRI-LA LT 9G:3239
Owner/Address: GARDNER CAMERON
12621 BONA KIM LP ANCHORAGE AK 995150000
Site Mailing Address: 16400 SANDPIPER DR, Anchorage
This permit is for the construction of:
Lot Size in Sq Ft: 47791
Total Bedrooms: 4
Y Disposal Field Y Septic Tank N Holding Tank N Privy Y Private Well N Water Storage
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 (18AAC80).
3. The wastewater code requires inspections during the installation. The engineer must notify the Development Services
Department at least 2 hours prior to each inspection. Provide notification by calling (907) 343-7904 (24 hours).
4. From October 15 to April 15, a subsurface soil absorption system under construction during freezing weather must either:
A. Open and Close on the same day.
B. Covered, sealed, and heated to prevent freezing.
Received
Issued By
MUNICIPALITY OF ANCHORAGE
Community Development Department Phone: 907-343-7904
Development Services Division Fax: 907-343-7997
On -Site Water & Wastewater Program
ON-SITE SEWER/WELL PERMIT APPLICATION
Parcel I.D. 020-043-27
Property owner(s) CAMERON GARDNER Day phone 887-9520
Mailing address 12621 BONA KIM LP., ANCHORAGE, AK 99515
Site address 16400 SANDPIPER DR., ANCHORAGE, AK 99516
Legal description (Sub'd., Block & Lot) SHANGRI-LA LOT 9
Legal description (Township, Range & Section)
Lot Size Sq. Ft. Number of Bedrooms 4
APPLICATION IS FOR: APPLICATION IS AN: TYPE OF DWELLING:
(® all that apply)
Absorption Field Fx� Initial ❑ Single Family (SF)
0
(w/wo ADU)
Septic Tank Upgrade ,®
Duplex (D)
❑
Holding Tank ❑ Renewal Multiple Dwellings
❑
Privy ❑ (SF and/or D)
Private Well n
Water Storage ❑
THIS APPLICATION INCLUDES A VARIANCE / WAIVER REQUEST FOR:
NONE Distance:
I certify that the above information is correct. I further certify that this is in accordance with
applicable Municipal Codes.
of property owner or authorized agent)
Permit/Rush Fees:II P
Date of�Rayreen4� 1 l !3
Receipt Number: N / A
Permit No. OSP 1 31aya
Permit App_9-1-12.doe
Waiver Fees:
Date of Payment:
Receipt Number:
Waiver No.
A-Ak SpuMalmd
Environmental Consulting and Design
Municipality of Anchorage July 24, 2013
Development Services Department
On Site Water and Wastewater Program
4700 Elmore Road
Anchorage, Alaska 99519
Subject: Well & Septic System Installation Permit
16400 Sand Piper Drive
Ladies and Gentlemen:
I am writing to renew the well & septic system installation permit for Shangri-La Subdivision
Lot 9. The original permit application was prepared by Flat Top Technical Services in 2009.
The permit was last renewed on Feb. 2"d, 2010 and expired 12 months later. During a visual
inspection of the site on June 5`b, 2013 the test hole #1 monitoring pipe from 2006 was located.
It appears that the well and septic system can be installed without any modifications to the
approved design.
If you have any questions or concerns, please contact me at 279-3916.
Sincerely,
t.
Lars Spurkand, P.E.
Civil Engineer
203 West 15th Avenue Suite 203, Anchorage, AK 99501, Phone: (907) 279-3916
Fax: (866) 354-1597, Lspurkland@gci.net
MUNICIPALITY OF ANCHORAGE
Development Services Department
On-Site Water & Wastewater Program
4700 South Bragaw Street
P.O. Box 196650, Anchorage, AK 99519-6650
(907) 343-7904
ON-SITE WASTEWATER DISPOSAL SYSTEM / WATER SUPPLY PERMIT
Initial
Date Issued: Feb 02, 2010
Expiration Date: Feb 02, 2011
Permit Number: SW100006
Legal Description: SHANGRI-LA LOT 9
Design Engineer: 0019 FLATTOP TECHNICAL SERVICES
Owner Name: JASON EVERARD
Owner Address: 11803 N. HUMPHREYS PL
BOISE, ID 83714-
Parcel ID: 020-043-27
Site Address: SANDPIPER DR
Lot Size: 0 SQ. FT.
Total Bedrooms: 4 Permit Bedrooms: 4
This permit is for the construction of:
[] Disposal Field [] SepticTank [] Holding Tank [] Privy
[] Private Well
[] Water Storage
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 ( 18AAC80 ).
3. The engineer must notify DSD at least 2 hours prior to each inspection. Provide notification by calling
(907) 343-7904 ( 24 hours ). ( Not required for a Water Supply Permit only ).
4. From October 15 to April 15, a subsurface soil absorption system under construction during freezing weather
must be either: A. Open and closed on the same day.
B. Covered, sealed, and heated to prevent freezing.
Received By: '~~ ¢¢'~ Date: 3~/¢'¢'//~
Issued By: /~)~ ~/{~I~/ Date:
?'
?
Municipality ~'age
p.O. Box 196650 4700 Elmore Road
Anchoraqe, Alaska 99519-6650 · {907) 343-7904 · Fax {g07) 343-7997
htt p:l/www.munLorRIOnsite
,Development Services Department
On-Site Water end Wastewater Proqram
l)epartment
**** VARIANCE/WAIVER REVIEW ****
WP#: '~00002 HAg: Permit~: $W100006
PID#: 020-043-27
Legal Description: Shanqrl-la Estates Lot 9
Engineer:. Flattop Technical Services
Applicant: ,Jason Everard
Your request for a waiver of thc required $0 fcct horizontal separation from thc absorption field
to a slope greater than 25% has been approved. The approved separation distance is 32.0 feet.
This waiver approval applies to the proposed absorption field only. Any future upgrade to the
on-site wastewater disposal system will require all separation distances be met or another
approval from this department.
Waiver is Granted: ;~ Waiver is not Granted:
Date: ~/'~//f~7 Approved by:
Name o'~ RevieweL.~/
Rec#: 05596C Amount: $200.00 Date Paid:11/19/09
**** VARIANCE/WAIVER REVIEW ****
Municipality of Anchorage
Development Services Department
Building Safety Division
On-Site Water and Wastewater Program
4700 Elmore Road
P.O. Box 196650
Anchorage, Alaska 99507
www.muni.org/onsite
(907) 343-7904
ON-SITE SEWER/VVELL PERMIT APPLICATION
FOR A SINGLE FAMILY DWELLING
Parcel I.D.
Properly owner(s)
Mailing address
Site address
Day phone
I~'~,,.~ "~'~ip Code
Zip Code
Legal description (Sub'd., Block & Lot) ~..~./. o/.~ ~ ~7'''~' -
Legal description (Township, Range & Section)
Lot Size ~'~ -/-/~ Sq. Ft. Number of Bedrooms
THIS APPLICATION IS FOR (~;~ all that apply): THIS APPLICATION IS AN:
Absorption Field [] Initial
Septic Tank [] Upgrade
Holding Tank [] Renewal
Privy []
Private Well []
Water Storage []
[]
[]
[]
I certify that the above information is correct. I further certify that this application is being made for a
Single Family Dwelling and is in accordance with applicable Municipal Codes.
(Signature of property owner or authorized agent)
Permit/Rush Fees:
Date of Payment:
Receipt Number:
(Rev. 11/05)
Waiver Fees:
Date of Payment:
Receipt Number.
: ;I AT'Top EGHNICAL SERvIcES
ClVtk & ENVIRONMENTAL ENGINEERING * ENERGY CONSERVATION & ANALYSIS
TED MOORE, P.E. 14530 ECHO CANYON ROAD
PHJFAX: (907)345-1355 ANCHORAGE, AK 99516
E-Mall: tgmoore~gcLnet November ! 8, 2009
M.O.A. DSD
P.O. Box 19-6650
Anchorage, AK 99~ 19
Dear Sirs:
The purpose of this letter is to provide the required design narrative in support of our application for a
permit to construct water supply and wastewater disposal facilities on Lot 9 of Shangri-La Estates,
located on Sandpiper Drive. We are also requesting a waiver allowing the proposed drainfield to be 32
feet axvay from a slope that exceeds 25%. Soils logs, a site plan, design drawings and construction
specifications are enclosed for your review.
Soils testing conducted on this lot in June of 2006 revealed the presence of shallow bedrock throughout
the lot, with the most suitable area for on-site wastewater disposal system construction being in the
vicinity of test hole # 1. As you can be seen from the log for test hole # I, the soils in this area include a
stratum of relatively clean silty gravel extending from 0.75' to 3 feet below ground level, which has a
measured percolation rate of 2 minutes per inch. While moist soil was observed at the bedrock
interface, no significant groundwater ever built up in subsequent monitoring. Using a somewhat
conservative soil application rate of 4 gpd/square foot for a Category Ill advanced treatment system the
required absorption area is (4 x 150)/4 = 150 square feet, which can be achieved by constructing a 5-foot
wide by 30-foot long soil absorption drainfield.
The natural topography in the area of proposed construction slopes down towards the northwest at an
average slope of 15% for a distance of 30-35 feet from the test hole, after which point the land drops
down towards the existing driveway at a 50% slope. We plan to locate the drainfield no closer than 32
feet from this break in slope. As illustrated on the cross-section view, an imaginary line descending at
25% from a point 2 feet above the distribution pipe would not exit original ground until a distance of 35
feet from the edge of the drainfield had been achieved. Given this configuration, there should be no
concem regarding the potential for effluent from this bed to daylight laterally through the side slope.
Because this is an advanced treatment system I am requesting the property owner to come in to your
office in order to execute the required maintenance agreement prior to final issuance ofthe permit.
A potential site for a similar replacement drainfield is illustrated on the site plan. Please give me a call
at 345-1355 if you have any questions on this submittal.
Sincerely,
Ted Moore, P.E.
cc: Jason Everard
Wocken~ss, Deborah M.
From:
Sent:
To:
Subject:
tgmoore@gci.net on behalf of Ted Moore [tgmoore@gci.net]
Friday, December 04, 2009 1:18 PM
Wockenfuss, Deborah M.
RE: Shangri-la Estates, L9.doc
Debbie~
This is in response to your "pink sheet" dated 12/1/09 on the subject lot. The following
numbers correspond to your expressed concerns.
(1) As noted in my cover letter to you, the property owner has been made aware of this
requirement and will sign the required maintenance agreement prior to issuance and pick-up
of the approved permit.
(2) I delivered revised drawings to you yesterday that, I believe, correct minor
discrepancies between the various drawings.
(3) I believe that all accepting soil did have the required percolation test. Please note
that 15.65.060.G.3 specifies that the minimum receiving soil stratum of concern is 24
inches below the sewer gravel, not 48 inches as you had suggested.
(4) I agree with you that the method outlined in Jim Cross's 2004 memo for evaluating
waivers of the 50-foot required setback from slopes in excess of 25% does not make a lot
of sense, as evidenced by this configuration (or any mounded system). I am open to any
suggestion you may offer regarding a preferred method. Basically, I feel that this code
required setback, in general, is way more conservative than can be justified from an
engineering point of view, so it is difficult for me to provide a site-specific
engineering rationale as to why issuance of a waiver should in a particular instance, but
not in general.
Perhaps you could consider the following information in assessing this waiver request.
(a) The ML stratum underlying the GM receiving soils is not impermeable as evidenced by
the minor wetness observed at the bottom of the test hole. As the effluent passes through
the receiving GM soils into the ML it will have an opportunity to fan out over a far wider
(7 times as wide) area of the underlying ML stratum and have ample opportunity to
percolate through that stratum prior to reaching the steeper slopes. (b) The effluent in
this case is Category III Advanced Treatment System effluent being applied at a
significantly more conservative application rate than called for in the code, which gives
it an enhanced ability to percolate downwards without creating a public health hazard.
I hope the foregoing is useful. Please let me know if and when your concerns #2 through
5 have been satisfactorily address and I will remind the property owner of the need to
come in and sign the maintenance agreement.
Ted Moore, P.E.
345-1355
..... Original Message .....
From: Wockenfuss, Deborah M. [mailto:WockenfussDM@ci.anchorage.ak.us]
Sent: Tuesday, December 01, 2009 10:19 AM
To: Ted Moore (tgmoore@gci.net)
Subject: Shangri-la Estates, L9.doc
WELL---° LOT 3 LOT 4 �E L
--------------
SANDPIPER DRIVE
.6'-Wbx iii' LONG �
SOIL ABS. D -_- IFI L
----------------------- ---M'{FILTER SAND & ----- - 15%
------------------------------ --- ....
�'
0.8' SEWER GRAVEL 50%
T.H.
SEPTIC
PUMP BASIN 15°l0
AREA
1500 -GALLON
ADVANTEX TANK ,
& ORENCa -20 t
TREATMENT POD PROPOSED'
REVISED DRIVEWAY
SITE FOR SIMILAR
�.'.��REPL. DRAINFIELD
� PROPOSED
i5% R = 9{)t}' 4-BDRM
R 100,
s R Imo' WELL
WELL T.N.42
\
LOT `.
LOT TO
LOT 8 ;
SNANGRI-LA SID SHANGRI-LA SI[
ra
:- t-00"von ;.
- A
LOT 14 EXISTING ';"4T�:
BIOCYCLE
Z-
SOIL ABS. a .'
MOUND-
CE 3,5V LOT 13
SEPTIC
NOTE.r AREA
PRIOR TO DRILLING SQL
LOT 9, SHlANGR14-A SID
THE WELL THE PROPOSED WELL & SEPTIC SYSTEM
OWNER AND DRILLER
SHALL MAKE SURE Gfl� SITE PLAN
THAT THE NEW SITEf'
IS GREATER THAN 100' FLATTOP TECHNICAL SERVICES I INCH = 50 FEET
FROM THE $IOCYC'LE 14530 ECHO CANYON ROAD DRAWN BY TFM
TANK AND ABS. BED V&L ANCHORAGE, ALASKA 99516 REV. NOV., 20110
ON LOT14
NOTE. THIS IS NOT A SURVEYED PLAT.
ALL LOCATIONS SHOWN ARE APPROXIMATE.
LOT 3
WELL ~ ~ / '~. LOT4 WELl.
,, SANDPIPER DRIVE
5'-WIDE x 30' LONG ' ' - -...
5. DRAINFIELD
~ FILTER SAND & --
'E~ SEWER GRAVEL
50%\ T.H.
: O o~X SEPTIC
';-,h ~' ., PUMP BASIN 15% AREA
1500-GALLON
', .,' "..~.. ADVANTEX'
. ' ' ,&ORENCOAX-20
":!'~: ' ~:" ", TREATMENT POD "
,
~ PROPOSED
~, s'., DRIVEWAY
,
, T,H.
, 25'x, , R 100'
,
; LOT 9 ~ ,, R 100'
,' SHANGRI-LA SID ,~ '
R100'
WELL
LOT 8
SHANGRI-LA S/D
LOT 14 ." · EXISTING
· BIOCYCLE
. , ,,
SOIL ABS. '
SYSTEM
SITE FOR SIMILAR ..
REPL. DRAINFIELD
--WELL
LOT 10
NOTE: THIS IS NOT A SURVEYED PLAT.
ALL LOCATIONS SHOWN ARE APPROXIMATE.
LOT 9, SHANGRI-LA SID
PROPOSED WELL & SEPTIC SYSTEM
SITE PLAN
FLATTOP TECI[NICAL SERVICES I I INCH = 50 FEET
145.30 ECIIO CANYON ROAD DRAWN BY TFM
ANCIIOR. AGE, ALASKA 99516 NOVEMBER. 2009
_ RECOMMENDED
SITE FOR WELL
AREA
ORENCO
PUMP BASIN
"A"F / 1.25' DIA. SCHED 40 PVC
30 w. 3/16' HOLES ~ 18" O.C.
/
........ · ~! ..... '~.'"',~":'~'. ,~: .I /
ORENCO AX-20 ~ SOIL ABS. DRAINFIELD
TREATMENT POD ~. O.'~$ ' w-*-~-~-- - ILTER SAND
&~ SEWER GRAVEL
1500~ALLON ¢~ ,'xg' '
ADVANTEX TANK
4" DI~ l%3034
FROM HOUSE
PLAN VIEW
SCALE 1" = 10'
EXISTING
-- GROUND
@ 50%
IMAGINARY
SLOPE
LINE
2" RIGID
FILTER FABRI(
O.75' SEWER GVL
) 15% (0.5' UNDER PIPE)
0.75' FILTER SAND --
32
35
1.25" DIA.
SCHED. 40 PVC
18" O.C.
CROSS-SECTION "A - A"
SCALE: 1" = 6'
LOT 9, SHANGRI-LA ESTATES
SEPTIC SYSTEM INSTALLATION
PLAN AND CROSS-SECTION
FLATTOP TECI INICAL SERVICES
14530 ECIIO CANYON ROAD
ANCIIORAGE, AK, 99516
SCALE: AS SIIOWN
DP.AWN BY: TFM
NOVEMBER, 200~
FLA'I-rOP TECHNICAL SERVICES
14530 ECHO ST.
ANCHORAGE, ALASKA 99516
SOILS LOG - PERCOLATION TEST
LEGAL DESCRIPTION: _Lot 9, Shangfi:-La S~)
DATE PERFORMED: __June 23, 2006
PERFORMED FOR: .... Gene BP/her._
DEPTH
(feet)
1-
2-
8-¸
20"
GM Reddish silty gravel
ML Gray gravelly silt
J)d
GP/GM Somewhat silty gravel
Variable thickness
ML Gray gravelly silt - w~t at bottom
B.H. (Hard bedrock)
Depffl to Grour~water
.:w,~t @ 6.5..__
_83'bgl. --
_Monitor_ ~b~:d~'-
COMMENTS:
SLOPE
.See
Slope
Arrows
',...,'.,
SITE PLAN
SANDPIPER DRIVE
[ · ng T~me (minutes) J Reading
I-~3o-i-1'2 -'Presoak ........ '~'--31----
/- -, :!2"_Resoak: ......... q' --'31 ....
[ .... 1 _Add water & start '--:12:38::15 ............ -'I--27-
L--~I .... #1 _ ----12:43:15 ...... 5 .......-'I--23 7/8
[ __] _Add water .... 12:43:50 ........... ~'--27 -
/I #2 .... 12:48:50 5 ........ 24 i/8 ---'
[_---__.~j -Add Water -- --12:49:20 ............ 27 ---
[----~ .... #3 '-------- --i2:54:20 ..... 5 ......... 24 3/8 --
I'~--~ -Add Water--1 --12 55 15 .............. 27 ' ---
['-- --[ ..... #4 ...... 1'00'15 ........ 5 ....... 24 9/16 --
[ .... [ Add Water '1- '- 1i00140 ............. ;--27
[--'---[' - - #5 '~ --1'05'40 .... 5 ........ 24 9/16
.... £.: .. ..............
N~t Drop
---'3'1/8
.... 2 7/8--
--25/8----
---2 7116 --
2 7/16--
PERCOLATION RATE 2__ (minutes/mc:h) PERCHOLEDIA,M~r.J~
TEST RUN BETWEEN__2.0..__ Fl' AND_ 2.5 .... FT
PERFORMED BY FLATTOP TECHNICAL SERVICES. I_~.,(.,~/' ~ CERTIFY THAT THIS TEST WAS PERFORMED IN
ACCORDANCE WITH AU. STATE AND MUNICIPAL GUIDELINES IN EFFECT ON THIS DATE. DATE: _ l__/. /_~/_ ~'/' ~
q:lattop Tec~nicalSemice~
14550 P_zbo $treet, Ancborage, AK 99516
Pl~one (907,) $45-1355
Lot 9, Shangri-La Estates
Sandpiper Drive
Wastewater disposal system installation
Specifications
1.0 General:
I.I The seope of the project consists of installing an "Advantex' advanced treatment system consisting
ora ! 500-gallon steel Anchorage tank with an Orenco AX-20 treatment pod and an "Orenco" discharge
pump basin. The filtered effluent is to be pumped up into a 5-foot wide by 30-foot long residual
disposal dminfield located adjacent to test hole #1.
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 conform to Municipal and State requirements.
All separation distances shall be in conformance with Municipal requirements, unless specifically
waived.
1.3 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.
!.4 The contractor shall be responsible for finish grading after the soil is compacted, as well as
placement of 6 inches of topsoil and reseeding all areas disturbed by the construction.
2.0 "Advantex' AX-20 Advanced Treatment System:
2.1 The "Advantex' treatment unit major components include (I) a 1500-gallon, 2-comparlment coated
steel tank, (2) an "Orenco' AX-20 filter pod, and (3) an "Orenco" fiberglass pump discharge basin. All
components shall be Municipally approved and shall be set level on undisturbed soil and backfilled in
accordance with Municipal requirements as well as Orenco's and the supplier's instructions.
2.2 All pipe connections to the tank shall be equipped with waterproof mechanical couplings. The
waste line from the residence to the tank shall have a minimum slope of I/4" per foot. A foundation
cleanout shall be installed within I' -4' from the building.
2.3 The contractor shall be responsible to obtain the necessary Municipal electric permit and inspection,
and shall provide a copy of the electrical inspector's report to the engineer overseeing the construction
of the svastewater disposal system.
2.4 The second compartment ofthe tank shall be equipped with a watertight, insulated manhole riser
and cover extending a minimum of 6" above final grade with positive surt~ace drainage away from the
manhole. The Advantex AX-20 treatment pod shall be installed over the tank with the cover extending
a minimum of 3 inches a.g.I. The contractor shall be responsible for determining the necessary length of
the manhole riser, and for properly positioning lhe Reeirculating Splitter Valve (RSV) in the riser.
2.5 An "Orenco" pump basin shall be installed downstream ofthe Advantex tank. The lift station
manhole riser shall extend a minimum of 6 inches above final grade.
2.6 The control and alarm floats shall be set at the elevations specified by the supplier, and their proper
operations shall be verified by the contractor.
2.7 The treatment unit shall be set up with a "VeriComm" remote monitoring system as supplied by the
distributor, and the control panel for the unit shall be mounted at an approved location.
3.0 Residual soil absorption system:
3.1 The 5' x 30' residual soil absorption drainfield shall be constructed in the vicinity of test hole #1.
Particular care shall be taken to ensure that the drainfield excavation ~ no closer titan 32feet from
the brea~ in slope above the drivewa): The initial step will be to remove the native peat and upper
portion of the silty gravel to create a level surface at a depth of 1.75 feet below original ground level at
the uphill side of the excavation.
3.2 Next, a total of 0.75 feet of ISF filter sand (<2% passing the #100 sieve and < 1% passing the 0200
sieve) shall be placed in the excavation (as illustrated on the cross-section) to create a 5' by 30' level
surface i.0 feet below ground level on the uphill side of the excavation. The filter sand shall be
compacted by foot as it is being placed. Next, a total of 0.75 feet of sewer gravel shall be placed on top
of the sand filter material with the perforated distribution pipe laid level such that the pipe invert is no
less than 0.5 feet above the bottom ofthe sewer gravel. Sewer gravel shall be 0.5" - 2.5" washed gravel.
The distribution pipe shall be fabricated from !.25" diameter Schedule 40 PVC with 3/16" diameter
holes drilled in the bottom at 18-inch intervals.
3.3 The monitor tube shall be of 4" diameter and installed in the location shown on the design drawings.
The portion ofthe monitor tube extending through the sewer gravel shall be perforated.
3.4 Approved filter fabric, two inches of figid insulation and a minimum of 2.0 feet of soil cover shall
be placed over the entire top surface ofthe sewer gravel. Fill slopes shall be no steeper than 3:1. The
finish grading shall include 6 inches of topsoil and seeding to promote rapid revegetation of all areas
disturbed by the construction.
4.0 Inspections:
4.1 A minimum of 5 engineering inspections will be required during the course ofthe project: (i)
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 fight elevation, and conforms with the soil test
information, (3) after the filter material has been placed, (4) after the sewer gravel is in place and the
distribution pipe has been laid and connected up to the septic tank, but prior to placement of insulation
or filter fabric, and (5) after rough backfill and grading is complete. The "Advantex' treatment unit and
Orenco pump basin requires one inspection after the lank is set level and the piping connected, but prior
to backfill. This inspection may be incorporated with any ofthe above inspections.