HomeMy WebLinkAboutLAKE RIDGE TERRACE #1 BLK 8 LT 7is
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awl
Lot 7
#051 -322-23
MUNICIPALITY OF ANCHORAGE
On -Site Water & Wastewater Program
PO Box 196650 4700 Elmore Road
Anchorage, Alaska 99519-6650 Phone: (907) 343-7904 Fax: (907) 343-7997
http://www.muni.org/onsite
On -Site Wastewater Disposal System Permit
Permit Number: OSP251388
Work Type: SepticTank Upgrade
Tax Code Number: 05132223000
Site Legal Address: LAKE RIDGE TERRACE #1 BLK 8 LT 7 G:0553
Site Mailing Address: 14407 W LAKE RIDGE DR, Eagle River
Owner: COBB CHARLES F & KAREN D TRUST
Design Engineer: FROSTED GROUND ENGINEERING SSERVICES LLC
This permit is for the construction of:
❑ Disposal Field Q Septic Tank ❑ Holding Tank ❑ Privy
Effective Date:
Expiration Date:
10/22/2025
10/22/2026
Lot Size in Sq Ft: 17815
Total Bedrooms:
Non -Public
❑ Water Well ❑ Water Storage
All construction shall 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 shall notify the Development
Services Department per AMC 15.65. Coodinate with On -Site staff regarding preferred method.
4. From October 15 to April 15, a subsurface soil absorption system under construction during freezing weather
shall be either:
a. Opened and Closed on the same day, or
b. Covered, sealed, and heated to prevent freezing
Special Provisions:
1. Confirm property line to septic field and apply for a waiver if required prior to a future COSA.
2. WRO10051 waived tank to well separation. This waiver is renewed with this permit approval and assigned
OSV251043 as a new number. This waiver has been in place now for 24+ years and water quality has not
been affected as seen by the 2025 water samples provided with this permit.
Issued To: FROSTED GROUND ENGINEERING SSERVICES LLC
Issued By:
Date: 10/22/2025
Date:
10/22/2025
MUNICIPALITY OF ANCHORAGE
0 1-
Development Services Department Phone: 907-343-7904
On -Site Water & Wastewater Section Xk- *t--::
ON -SITE SEPTIC/WELL PERMIT APPLICATION
Parcel I.D. 05132223000
Property owner(s) Charles and Karen Cobb Day phone 907-748-2942
Mailing address 175 Hells Hollow Drive, Blue Ridge, GA 30513
Site address 14407 W Lake Ridge Drive, Eagle River, AK, 99577
Legal description
Lake Ridge Terrace #1 Block 8 Lot 7
Number of Bedrooms
Engineering Firm Frosted Ground Engineering Services
Building Permit Number
Not Applicable F01
APPLICATION IS FOR: APPLICATION IS AN:
(N all that apply)
Disposal Field
E] Initial E]
Septic Tank
El Upgrade El
Holding Tank
0 Renewal ❑
Privy
❑
Well
❑
Water Storage
❑
THIS APPLICATION INCLUDES A WAIVER REQUEST FOR:
Well to Tank, T-,�_- Took4o-Foundeben- Distance:
Designing for a 4-Bedroom Capacity, see waiver narrative for distances
Permit/Rush Fees: W 5 Waiver Fees: $145
Date of Payment: to/1/45 Date of Payment: 1012-1l)-f
Permit No. GSM] W Waiver No. OWWol
May 2025
Frosted Ground Engineering Services, LLC Project No. P20250902
MOA Development Services, On-Site Water & Wastewater Program
4700 Elmore Road
Anchorage, AK 99507
Lake Ridge Terrace #1 Block 8 Lot 7 – 14407 W Lakeridge Drive Septic
Tank Replacement
To whom it may concern,
The owner of the aforementioned lot has a 3-bedroom home on the property with a septic
system that is nearing the end of its life. The current system consists of a steel 1,000-gallon
tank (installed in 1997, an undocumented system), a 700-gallon steel lift station, and a
pressurized 90’ deep trench (uphill of the tank with all monitoring tubes and cleanouts verified
during the September 2025 COSA) being utilized. Due to the age and uncertainty surrounding
the installation of the tank, the owner has elected to pursue a tank replacement. The
replacement tank shall be a 1,500-gallon polyethylene MOA-approved tank with a lift station
incorporated, sizing the system to support a 4-bedroom home. During the COSA, the following
deficiencies were noted, and waivers are being requested.
1. Lift Station to Well Waiver: Similar to the septic tank waiver in the 2001 Permit, the new
septic tank requires a waiver for being approximately 88’ from the well. We are
requesting that a similar logical application for the septic tank to well be applied to the lift
station as well. As stated in that application, effluent is treated well within the native
substrate in a short distance, and the homeowners daylight basement would serve as an
obstacle for the path of flow.
2. Lift Station to Surface Water (Fire Lake) The new septic tank is approximately 96’ from
the surface water (Fire Lake). However, the current residential structure is obstructing
the path of overland flow. This makes the shortest path approximately 110’ of surface
travel, going around the northeast portion of the home.
3. Tank to Foundation: Please see the second sheet of the replacement plans for the tank
for a diagram of the proposed new tank placement. The tank is expected to be shifted to
the north, allowing for more distance between the bottom of the home’s foundation and
the tank. If installed to these specifications, the tank should be entirely outside a 1:1 load
distribution prism from the foundation.
4. Drainfield under Driveway Waiver: Using measured values collected from the 2025
COSA, the following depths for the monitoring tubes are as follows:
Monitoring Tube ID Depth from top of casing (ft)
MT1 16.0
MT2 16.5
MT3 18.3
The effective depth of the trench is listed at 8.0 feet, per the 2001 inspection report. Both
MT2 and MT3, the closest monitoring tubes to the driveway, had one foot of stick-up.
Municipality of Anchorage
On-site Water and Wastewater
REVIEWED FOR CODE COMPLIANCE
OSP251388, Curtis Townsend, 10/22/25
Frosted Ground Engineering Services, LLC Project No. P20250902
This would put the depth of the pressurized distribution pipe at approximately 7’ below
the ground surface at MT2 and approximately 8.3’ below the ground surface near MT3.
Additionally, there is insulation installed over the drainfield. Given a minimum of six feet
of cover and insulation board placed over the drainfield, the load distribution of the traffic
activity dissipates prior to reaching the PVC pipe. This makes it a minimal concern for
the system.
Granting a new tank replacement and these waivers should not cause any eminent health
hazard concerns or adverse effects to the homeowners or neighboring lots. Additionally, the
home is currently not occupied and is not anticipated to be occupied before the replacement of
the septic tank.
If there are any questions, comments, or concerns, please do not hesitate to contact via phone:
(907) 398-5272 or email: Eli@fg-eng.com.
October 21, 2025
Sincerely,
Eli D. Ward, PE
Principal Engineer
LAKE RIDGE TERRACE
ADDITION 1
BLOCK 8
LOT 6A
LAKE RIDGE TERRACE
ADDITION 1
BLOCK 8
LOT 8
LAKE RIDGE TERRACE
BLOCK 8
LOT 5
R100
'
NEI
GH
B
O
R
S WE
L
L
:
R100'
W L
AK
E
R IDGE
D
R
I
V
E
GL
ENN
HW
Y
N
O
R
T
H
EST. WATER SEPARATION: 96'
LOWER FIRE LAKE
(E) LIFT STATION
AND SEPTIC TANK,
TO BE REMOVED
NEW 1500 GALLON TANK
EST. WELL SEPARATION
DISTANCE: 88'
L
O
T
W
E
L
L
:
R
1
0
0
'
MOA PROVIDED
LAKE SHORELINE
GRAVEL DRIVEWAY EXTENTS
MOA PARCEL
LOT LINES
(E) STRUCTURES
(E) DRAINFIELD
MT1
MT2
MT3
TANK
OVERFLOW
ANTICIPATED
TRAVEL
PROJECT:
SHEET TITLE:
DESIGNED BY:
C:\USERS\AKEDW\ONEDRIVE\DESKTOP\FGES\PROJECTS\20250902 - FIRE RIDGE COSA\FIRE RIDGE SITE PLAN.DWG
PUBLISHED CTBDRAWING LOCATION DATE TIME SCALE
SHEET OF
YEAR
PROJ.
NO.
AS NOTED
CHECKED BY:
DRAFTED BY:
CLIENT:
FGES_2025
LOT LEGAL DESCRIPTION:
ELI D. WARD
CE 105859REGISTEREDPROFESSIONAL E N GINEER
October 21, 2025
10/21/2025 1:45 PM
02
EDW
EDW
EDW
01
2025
2025050902
LAKE RIDGE TERRACE ADDITION 1 BLOCK 8 LOT 7
CHARLES AND KAREN COBB
14407 LAKE RIDGE DRIVE TANK REPLACEMENT
VICINITY MAP
ALL STRUCTURES, WELLS, AND SEPTIC SYSTEM FEATURES ON ADJACENT PROPERTIES ARE BASED ON PUBLICLY AVAILABLE INFORMATION OBTAINED FR
MOA RECORDS AND/OR AS-BUILT SURVEYS.
(FEET)
0 25
50 100
MT - MONITORING TUBES
Municipality of Anchorage
On-site Water and Wastewater
REVIEWED FOR CODE COMPLIANCE
OSP251388, Curtis Townsend, 10/22/25
INLET
OUTLET (CONNECT
TO EXISTING)
1:1 PROJECTION
FOUNDATION TO INLET
FOUNDATION BLOCK WALL
CONSTRUCTION NOTES:
1. FGES WILL BE GIVEN A MINIMUM OF 72 HOURS NOTICE PRIOR TO ANY CONSTRUCTION EFFORTS.
2. REMOVED EXISTING SEPTIC TANK PER MOA 15.65 STANDARDS. ALL CONSTRUCTION SHALL ADHERE TO MOA 15.65
3. NEW 1,500 GALLON SEPTIC TANK AND LIFT STATION SHALL CONNECT TO EXISTING PIPE BETWEEN FOUNDATION CLEANOUT AND EXISTING TANK.
4. COVER OVER DRAINFIELD SHALL BE GREATER THAN OR EQUAL TO THREE FEET, WHILE COVER OVER THE SEPTIC TANK WILL BE GREATER THAN OR EQU
FOUR FEET. IF UNDER THE MINIMUM AMOUNT COVER, TWO INCHES OF INSULATION MAY BE SUBSTITUTED FOR UP TO TWO FEET OF COVER (ONE FOOT P
OF INSULATION).
5. ALL PIPE SHALL BE SCHEDULE 40 ABS AND/OR PVC CONFORMING TO ASTM F628 AND ASTM 3034 AS APPLICABLE OR ENGINEER APPROVED EQUAL.
FOUNDATION TO TANK CROSS-SECTION
02
A
NOTES:
1. LIFT STATION COMPONENTS NOT SHOWN FOR DRAWING CLARITY.
2. TANK IS SIZED FOR A 4-BEDROOM HOME (1,250 GALLONS) AND A LIFT STATION (250 GALLONS) FOR A TOTAL SIZE OF 1,500 GALLONS.
3. TANK IS ASSUMED TO BE A POLYETHYLENE 1,500 GALLON EFFLUENT TANK WITH LIFT STATION OR EQUIVALENT UPON ENGINEER APPROVAL. PLEASE SE
ATTACHED SUBMITTAL DATA SHEET FROM ANCHORAGE TANK.
4. TANK SHALL CONNECT TO EXISTING PIPING INFRASTRUCTURE. LINE MAY BE SHORTENED TO ACCOMMODATE NEW TANK ALIGNMENT.
5. GRADE FILL ABOVE TANK AWAY FROM THE TANK TO DISCOURAGE SURFACE PONDING.
PROJECT:
SHEET TITLE:
DESIGNED BY:
C:\USERS\AKEDW\ONEDRIVE\DESKTOP\FGES\PROJECTS\20250902 - FIRE RIDGE COSA\FIRE RIDGE SITE PLAN.DWG
PUBLISHED CTBDRAWING LOCATION DATE TIME SCALE
SHEET OF
YEAR
PROJ.
NO.
AS NOTED
CHECKED BY:
DRAFTED BY:
CLIENT:
FGES_2025
LOT LEGAL DESCRIPTION:
ELI D. WARD
CE 105859REGISTEREDPROFESSIONAL E N GINEER
October 21, 2025
10/21/2025 1:45 PM
02
EDW
EDW
EDW
02
2025
2025050902
LAKE RIDGE TERRACE ADDITION 1 BLOCK 8 LOT 7
CHARLES AND KAREN COBB
14407 LAKE RIDGE DRIVE TANK REPLACEMENT
FOUNDATION CROSS SECTION AND CONSTRUCTION NOTES
(FEET)
0 2.5
5 10
8'
Received Date/Time 09/02/2025 10:55
09/01/2025 13:53Collected Date/Time
1254599001
Matrix
SGS Ref.#
Client Sample ID C. Cobb Kitchen Sink
Client Name
Project Name/#
Printed Date/Time 09/10/2025 10:01Residential Testing - Cash Account
Technical Director Stephen C. Ede
Eli Ward -Client: Charles Cobb
Drinking Water
Sample Remarks:
Parameter Results LOQ Units Method
Allowable
Limits
Prep
Date
Analysis
Date InitContainer ID
Metals by ICP/MS
HBL09/04/25EP200.8ug/LArsenic 09/03/25ND5.00 (<10)B
Waters Department
MCP09/08/25SM21 4500NO3-Fmg/LTotal Nitrate/Nitrite-N ND 0.200 (<10)C
Microbiology Laboratory
HBL09/02/25SM21 9223B100mLE. Coli Negative 1 A
HBL09/02/25SM21 9223B100mLTotal Coliform Negative 1 A
2 of 5
Municipality of Anchorage
Development Services Department
Building Safety Division ` s1,
On -Site Water and Wastewater Program, 4700 S. Bragaw St.
P.O. Box 196650 Anchorage, AK 99519-6650 Pagel Of 3
www.ci.anchorage.ak.us (907) 343-7904
ON -SITE WASTEWATER DISPOSAL SYSTEM AND/OR WELL INSPECTION REPORT
Permit Number: S 010 32- PID Number: O,�7t— y 2Z
Name: ff Jj
Wastewater System: ❑ New Upgrade
Address: -
40 11 a 6f- ABSORPTION FIELD
Phon
Number of Bedrooms:
( A Deep Trench ❑ Shallow Trench ❑ Bed ❑ Mound ❑ Other.
LEGAL DESCRIPTION Soil Rating: Total Depth from ori ginal grade: Block, L4t:� GPD/Ft1 Ft.
., ubdlwst t"wDepth to pipe bottom from original grade: Gravel depth beneath pipe:
Township: Ft. /,,— w� Range: Section: Fill added above original grade: Gravel Length:
Ft.
We ❑ New ❑ Upgra Gravel width: Numberof/lines: Distance between lines:
Classification (Private, A, Fl. / FL.
Total Depth: Cased to: Total absorption area: Pipe Mate k
IlM
Driller. Da d: Static Water Level: Ins(aller.
Date In lallesi:
Ft. C<
Yield: Pump Set at: Casing Heig ve Ground:
GPM FL TANK
SEPARATION DISTANCES
eptic
ank
Absorption
Field
Lift
Station
Holding
Tank
Public/Privat Manufacturer.
Sewer Line AA
LJ Other:
Capacity
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Material:
LIFT STATION
Number of Compartments:
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{
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Size:Manufacture
'% G�"�_Pump
on" level aka(
Pump off level at: 7
Wgh water alarm at:
in
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Pump Make & Model
5:1atl�i,S4,2Gk�
Electrical Inspect,iopps perlo ed by.
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rr
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LOT 7
ARAGE
48.6' 23'
26.S
Ljj 32.5'
RECORDED ACCESS
DEED 76-040994. R100.0
rj LOT 8
f
LEGEND:
CLEANOUT •
NOTES: DRAINLINE
1) Two Inches Insulation over main log of drainlins. LIFT STATION 0
2) Four inches of insulation over main leg of pressure line. SEPTIC TANK
3) Pressure line in four Inch PVC secondary containment pipe CONCRETE
from lift station to edge of drain trench. MONUMENT EL'loo
WOOD DECKS
GRAVEL DRIVE
SCALE: I INCH = 40 FEET WATER WELL
A' POWER POLE
•. . ........
7EST NOIJE
J% C B
AS —BUILT DRAWING
LOT 7 BLOCK 8 LAKE RIDGE TERRACE SUBDIVISION
44
C
EAGLE RIVER, ALASKA
A
3332
PERMIT NUMBER SW010332
DRAWN BY. CHARLES F COBB,P.E. PID NUMBER 051-322-23
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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 PERMIT
Upgrade
47`2- 7`ol O.�r
Date Issued: Aug 23, 2001
Expiration Date: Aug 23, 2002
Permit Number: SWO10332 Parcel ID: 051-322-23
Legal Description: LAKE RIDGE TERRACE #1 BLK 8 LT 7
Design Engineer: 0821 Eberle Engineering Services Site Address: 014407 LAKE RIDGE DR W
Owner Name: CHARLES F. COBB Lot Size: 17815 SQ. FT.
Owner Address: 14407 WEST LAKE RIDGE DRIVE Total Bedrooms: 3 Permit Bedrooms: 3
EAGLE RIVER , AK 99577-
This permit is for the construction of:
- Disposal Field ? Septic Tank Holding Tank (_' Privy F_ Private Well Water Storage
-- -J --
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:
Issued By:
Date:
Date: g^ z,3 .--0/
Municipality ®f Anchorage
Development Services Department
Building Safety Division Z:
On -Site Water and Wastewater Program
4700 South Bragaw St.
P.O. Box 196650 Anchorage, AK 99519-6650
www.ci.anchorage.ak.us
(907) 343-7904
ON -SITE SEWERIWELL PERMIT APPLICATION
FOR A SINGLE FAMILY DWELLING
Parcel I.D. -' _ Permit Number SWO / ® 33 2
Property owner(s) r Day phone -2-f - 063 G
Mailing address (1) 0 - L
E
Mailing address (2) Zip Code
Legal description (Lot, Block & Sub'd.) Lod 7,
Legal description (Section, Township & Range)
Lot Size I 1 Acres Number of Bedrooms __
THIS APPLICATION IS FOR:
Sewer Only ❑ Well Only ❑
Sewer and Well ❑ Water Storage ❑
Sewer Upgrade (K
THIS PROPERTY CONTAINS:
Hot Tub ❑ Jacuzzi ❑
Swimming Pool ❑ Water Softening Unit ❑
Therapy Pool ❑
Vo,
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.
V _ ,
C:-_ rl
(Signature of property owner or authorized agent)
Permit Fees: 3 Z.." Waiver Fees: i f S;
Date of Payment: C?/2 0 Date of Payment: I E
Receipt Number: _ 0( j ) Receipt Number. 7 0 9
(Rev. 12/00)
PERMIT APPLICATION
FOR
ON SITE WASTEWATER DISPOSAL SYSTEM
AT
LOT 7, BLOCK 8
LAKE RIDGE TERRACE
Prepared and submitted by:
Charles F. Cobb, P. E.
Alaska CE 8332
14407 W. Lake Ridge Drive
Eagle River, AK 99577
(907) 696-0191
u
a..ua
Eberle Engineering Services
Greg Eberle, P. E.
3875 Mariah Drive
Eagle River, AK 99577
(907) 694-0402
Lot 7, Block 8, Lake Ridge Terrace
TABLE OF CONTENTS
Section 1 Site Plans
Figure 1— Lot 7 Block 8, Lake Ridge Terrace and Adjacent Lots 6A and 8
Figure 2 — Lot 7 Detail
Figure 3 — Lot 7 Cross Section A -A'
Section 2 System Design and Specifications
Deep trench disposal field design for 4 bedroom home
Specifications for on -site wastewater disposal system
MOA Standards and Specifications for Component Parts...
Section 3 Geotechnical Investigation
Test Pit Log
Boring P-1 with Percolation Test
Boring MW-1 with Piezometer and Monitoring Data
Lot 6A Test Pit Log with Percolation Test
Section 4 Narrative and. Request for Waiver
Lot 7, Block 8, Lake Ridge Terrace
Section 1 Site Plans
Figure 1— Lot 7 Block 8, Lake Ridge Terrace and Adjacent Lots 6A and 8
Figure 2 — Lot 7 Detail
Figure 3 — Lot 7 Cross Section A -A'
Lot 7, Block 8, Lake Ridge Terrace
Lot -7 B[oc-6- 81 L-c�
-74 r, \J
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OUSE
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Section 2 System. Design and Specifications
Deep trench disposal field design for 4 bedroom home
Specifications for on -site wastewater disposal system
MOA Standards and Specifications for Component Parts...
Lot 7, Block 8, Lake Ridge Terrace
SPECIFICATIONS
FOR
ON SITE WASTEWATER DISPOSAL SYSTEM
AT
LOT 7, BLOCK 8
LAKE RIDGE TERRACE
Section A — General
1. Site plans and cross section in Section 1 are included in this Specification.
2. All materials and workmanship shall be of good quality and in accordance with
minimum requirements of AMC 15.65, Wastewater Disposal.
3. Soil conditions shall be verified by the contractor at the time of construction. The
engineer shall be notified of any changes.
4. The existing cribbing seepage pit is to be abandoned in place.
Section B — Materials
B.l Septic Tank and Lift Station
1. The septic tank, lift station and piping shall be in accordance with the Standard
Specifications for Component Parts and Material Used in Construction of On Site
Waste Water Disposal Systems dated February, 1999 by the Municipality of
Anchorage, Department of Health and Human Services.
2. The septic tank and t; ft station shall have a rnirAirt to combined storage capacity
of 1250 gallons for a 4 bedroom home, plus 250 gallons for the lift station.
3. The downstream end of the existing 1000 gallon septic tank shall be excavated
and inspected for integrity, and replaced only if necessary,
4. If the existing septic tank is adequate, a 500 gallon lift station shall be installed at
the location shown in Figure 2.
5. All new components shall be Anchorage Tank& Welding Inc. or approved equal.
6. All lift station components including switches, alarms, and wiring shall be in
accordance with manufacturer's specifications.
B.2 Piping
1. Effluent distribution piping shall be in accordance with lift station manufacturer's
recommendations.
2. Monitoring standpipes shall be L5 inch (minimum nominal diameter) ASTM
D3034 PVC. End caps shall be included and the bottom 7 feet shall be slotted or
perforated.
Lot 7, Block 8, Lake Ridge Terrace
B.3 Backfdl, Insulation and Geotextile
1. Drain gravel shall be 0.5 inch to 2.5 inch, screened, with a maximum of 3%
passing the #200 sieve.
2. Insulation shall be in accordance with the Standard Specifications for Component
Parts and Material Used in Construction of On Site Waste Water Disposal
Systems dated February, 1999 by the Municipality of Anchorage, Department of
Health and Human Services.
3. Geotextile shall be a woven, polyester fabric, Amoco 2004, supplied by owner.
Section C — Execution
CA Septic Tank and Lift Station
l . All excavations for subsurface features are to be in the exact areas shown on the
plans. Any deviations must be approved in advance by the engineer.
2. All loose soil shall be removed from the excavation and the septic tank and lift
station shall be placed on undisturbed soil.
3. The bottom of the excavation shall be prepared to properly bed the tanks and
graded in accordance with manufacturer's recommendations.
C.2 Piping
1. Effluent distribution pipe installed within the trench shall be installed level,
perforated in accordance with the lift station manufacturer's
recommendations, and installed with the pPrfnratinnc tintx u.
2. Effluent distribution piping between the lift station and the trench shall be non
perforated.
3. Pipe connecting the existing septic tank to the lift station add -on shall be
sealed and installed in accordance with lift station manufacturer's
recommendations.
4. All effluent distribution piping shall be properly bedded to prevent excessive
deflection or damage upon backfill.
5. One monitoring standpipe shall be installed vertical at each end of the trench
and at the bend, for a total of three monitoring standpipes. The standpipe shall
be installed to the bottom of the trench and in such a manner as to limit
deflection upon backfill.
6. At least 18 inches of stickup shall be provided above finish grade for all
monitoring tubes or cleanouts.
7. A 4 inch minimum nominal diameter steel protective casing shall be installed
over each monitoring tube
Lot 7, Block 8, Lake Ridge Terrace
C.3 Trench Excavation
i. The total surface area of the trench under the effluent line shall be
approximately 1.333 square feet.
2. The bottom of the trench shall be level, plus or minus 1.3 inches. The design
elevation of the trench bottom is 75.8 feet based on the site datum described
on Figure 1. The lowest elevation of the trench shall not be below 75.5 feet.
3. The total depth of the trench shall range from approximately 9.9 feet to 17.2
feet.
4. The sidewalls of the trench shall be inspected for slick or compacted surfaces,
and scarified with a steel rake if necessary.
C.4 Backfill, Geotextile, and Insulation
1. Drain gravel shall be installed to the minimum depth necessary to obtain the
required surface area specified in the previous section. An additional 2 inches
of drain gravel shall be placed after the effluent pipe is installed.
2. Drain gravel shall be installed in such a manner as to prevent contamination
with excavated material.
3. Drain gravel shall be installed in 12 to 18 inch lifts and tamped with the
excavator bucket to reduce settlement.
4. Owner supplied, woven geotextile fabric shall be placed over the entire length
and width of the drain gravel.
5. A minimum of 24 inches of native material will be backfilled over the drain
gravel. Four inches of insulation shall be placed in all areas with less than 36
inches of cover.
6. The area over the trenches is to be slightly mounded and finish graded to
prevent ponding of surface water.
Section D — Quality Assurance
1. The on site disposal system construction shall be inspected and documented in
accordance with AMC 15,65.150.
2. A minimum of two inspections shall be conducted.
3. At least on inspection shall occur after the trench is excavated and prior to the
placement of any backfill. If the trench cannot be excavated in its entirety
prior to backfill, then additional inspections will be conducted as necessary.
No trench backfill shall be placed unless the trench has been inspected by the
engineer.
4. An additional inspection shall occur after the placement of the effluent piping,
2 inch gravel cover, and geotextile and prior to the placement of any
insulation or soil cover.
5. An additional inspection shall occur as necessary to observe the condition of
the existing septic tank and to inspect the installation of the lift station add on.
6. Electric components shall be inspected by a licensed electrician.
Lot 7, Block 8, Lake Ridge Terrace
Section 3 Geotechnical Investigation
Test Pit Log
Boring P-1 with Percolation Test
Boring MW-1 with Piezometer and Monitoring Data
Lot 6A Test Pit Log with Percolation Test
Lot 7, Block 8, Lake Ridge Terrace
Municipality of Anchorage _
DEPARTMENT OF HEALTH & HUMAN SERVICES
825 "L7 Street, Anchorage, Alaska 99502-0650
SOILS LOG -- PERCOLATION TEST
PERFORMED FOR: Y CIS y DATE PER
LEGAL DESCRIPTION:_ _ �" , .r dd,k�oWnship, Range. Section:
E" I—\L.& ke �. �i��G/PACe SLOPE y
2 r "lfli5� 1�Vrow00
SPt N W t Tn. i -a-in k
3 �V7,,Ve_ '� DGC0.rj jaina1
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8
9
=0
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9
i
MENES in
ROM
f 'p Cglt/ lh 5 t iC�1 L.I i iHH
% WAS GROUND WATER ?'
W`I r� 50,V\A ENCOUNTERED?
( l S
cGG�S�Ovlct CD�D(Q IF YES, AT WHAT �L / 0
DEPTH?
i E
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=6 -I
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PERCOLATION RATE .L_ (rn nuts sraich), PERC HOLE DIAMETER 6v I
TEST RUN BETWEEN 1. 5 FT AND 17-5 FT 13(a5
COMMENTS
PERFORMED BY: I CERTIFY THAT THIS TEST WAS PERFORMED IN
ACCORDANCE WITH ALL STATE AND MUNICIPAL GUIDELINES IN EFFECT ON THIS DATE. DATE
72-M Mac 4/85)
3z
3,4,
31
3 q
3y
• .,� Municipality of Anchorage -
DEPARTMENT OF HEALTH & HUMAN SERVICES` '
825 "L" Street, Anchorage, Alaska 99502-0650
SOILS LOG -- PERCOLATION TEST
f1ElaC�i?Y fiLM flEfil E ,r
1 �S %j ° N e s r" P i3J. au
PERFORMED FOR: v
DATE PERFORMED:-
�t ,
LEGAL DESCRIPTION: �Let13lk e .l Irdd h oWnshlp, Range, Section.
�tcjT ,'(—�j k� �c�q � (@ vt Ace_ SLOPE SITE PLAN
1 Looses 1 bro ry 5 i t,1
2 y, ®vy AIC5 , Woody 9 i�5 ) -r fs,�LL
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9
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11
12
13
14
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16,
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19.
20.
WAS GROUND WATER
50 Il2Q5-t- F7 +ENCOUNTERED?
IF YES, AT WHAT L
DEPTH? P
Degh to WAW After
Momaritg? -oft
E
a
UPERCOLATION RATE (minutew"xh) pERC HOLE DIAMETER
TEST RUN BETWEEN FT AND _FT 1
COMMENTS Eyi C.O
PERFORMED BY. 1 CERTIFY THAT THIS TEST WAS PERFORMED IN
ACCORDANCE WITH ALLSTATE AND MUNICIPAL GUIDELINES IN EFFECT ON THIS DATE. DATE
72-ON (Rev. 4/85)
Municipality of Anchorage .
DEPARTMENT OF HEALTH & HUMAN SERVICES
825 "L" Street, Anchorage. Alaska 99502-0650
a veK01 SOILS LOG -- PERCOLATION TEST
�e B M i"
PERFORMED FOR:
LEGAL
cl-SF(.
ION: L.o'fi �� Cyr it� 8 , l dd'
'��a�i
',,. 9
m
GREGORY ALAN ERERLE
t o ® CE 90-1
DATE PERFORMED
Range, Section.
PERFORMED BY: i CERTIFY THAT THIS TEST WAS PERFORMED IN
ACCORDANCE WITH ALL STATE AND MUNICIPAL GUIDELINES IN EFFECT ON THIS DATE DATE
72-M 119ay. M85)
W SOILS LOG
MUNICIPALITY OF ANCHORAGE
• ►.� DEPARTMENT OF HEALTH AND ENVIRONMENTAL PROTECTION PERCOLATION
+ 825 L. Street, Anchorage, Alaska 99501 264-4720 TEST
SOILS LOG — PERCOLATION TEST
PERFORMED FOR:
DATE PERFORMED: 'F/?/f I
LEGAL DESCRIPTION: —1/0 f 6 %a l
P'IHSLOPE SITE PLAN
2
3
4
5
6
L
7
t
8
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9
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12
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13
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COMMENTS
0
4�
WAS GROUND WATER L
ENCOUNTERED? /"
0
P
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IF YES, AT WHAT
DEPTH?
114
Reading
Date
Gross
Time
Net
Time
Depth to
Water
Net
Drop
Sri y
5
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PERCOLATION RATE (minutes/inch) 75
TEST RUN BETWEEN FT AND 7 FT
Eagle River Engineering Services
PERFORMED BY: Pg B0x 773294 CERTIFIED BY: —�"" .Z'; DATE: /a
Eagle River, AK 99577
694-5195
72-008 (6/79)
Section 4 Narrative and Request for Waiver
The proposed design consists of a deep trench subsurface disposal field with a 1000
gallon septic tank and a 500 gallon lift station added on to the existing tank. The
proposed system is being designed for a 4 bedroom home and replaces the cribbing
seepage pit previously installed in accordance with municipal regulations current at that
time.
The Lake Ridge Terrace subdivision is located in Eagle River, southeast of the Knik Arm
near the transition between the Upper Cook Inlet-Susitna Lowlands and the Matanuska
Valley. Lower Fire Lake, which adjoins the site, is located in a glacial trough cut into
bedrock. The slopes east of the lake at the lower elevations are lateral moraine from the
Naptowne Glaciation period'. The area west of the lake near the site is believed to be
dominated by relatively shallow deposits of glacial outwash and till overlying bedrock.
Boring logs for water wells on Lot 5, Lot 6A, Lot 7 and Lot 8 were reviewed, as well as a
test pit log from the Lot 6A septic system design. The site water well located on the west
edge of the site below improvements shows shale bedrock near 60 feet below ground
surface (bgs) overlain by interbedded gravels and "clay". Soils within 30 feet of the
surface are described as "medium gravel and some clay" with a static water level 24 feet
bgs. The total depth of the well is 210 feet bgs. The water well log on adjacent Lot 8 is
within 35 feet at a similar elevation and is consistent. The water well for Lot 6A is
located approximately 90 feet from the Lot 7 line and at least 115 feet from the proposed
deep trench drain field. The well log shows clay and gravel to 18 feet bgs and
interbedded sandstone, shale and "rock ledges" to a depth of 260 feet bgs. The water
well log for Lot 5 is over 110 feet from the Lot 7 line and shows "clay sand & gravel" to
a total depth of 196 feet bgs. The Lot 6A test pit located near the north corner of Lot 7
shows "dense, dry, sandy gravel with silt (GM)" to a depth of 16 feet, with a percolation
rate of 32 minutes per inch. Locations of Lot 5, 6A, 7 and 8 water wells, and the Lot 6A
test pit are shown on Figure 1.
This information combined with the on site geotechnical investigation confirms that the
area is dominated by glacial till, which can be expected to exhibit low permeabilities.
Because of this characteristic and because minimum separation distances for the deep
trench, subsurface disposal field are achieved between all water wells and subsurface
disposal fields on adjacent lots, no adverse impacts from the proposed replacement
system are likely.
Groundwater encountered in MW-1 is most likely perched within the silty sand layer
interbedded with glacial till shown in the deeper water well logs, and is not an aquifer
used for water supply by any of the adjacent lots. Nevertheless, the proposed design
maintains the 4 foot minimum separation distance, requiring that a lift station be installed
in order to provide gravity service to the basement level of the improvements.
' Guidebook to Permafrost and Quaternary Geology along the Richardson and Glenn Highways between
Fairbanks and Anchorage, Alaska by T. L. Pewe and R. D. Reger, Division of Geological and geophysical
Surveys, Alaska Department of Natural Resources, 1983.
Lot 7, Block 8, Lake Ridge Terrace
Because of the relatively steep topography on the Lower Fire Lake side of the lot ( as
well as the 100 ft clearance required for surface water), a limited area is available for the
proposed subsurface disposal field and the alternate field outside of the 100 foot
clearances to the Lot 7 & 8 water wells. Consequently, the Lot 7 septic tank and lift
station located between the house and the primary deep trench requires a waiver to the
Lot 7 water well only. The revised offset distance is approximately 90 feet. No adverse
impacts are likely because of the low permeabilities on site, because the water well is
cased to bedrock and is very deep, and because the septic tank and lift station are sealed
systems.
An alternative deep trench disposal field location is shown on Figure 2 and 3.
A check in the amount of $625.00 for the proposed waiver is attached.
The proposed design described herein is certified to be in general compliance with the
requirements of AMC 15.65.
Certified by Charles F. Cobb, P. E.
Alaska CE 8332
Signature
9/' /Z- Z4.01
to
exA-8
332
o-
Seal
Lot 7, Block 8, Lake Ridge Terrace
Mtmiciof Anchorage
George P. jVuerch, Mayor
Building Safety Division
P.O. Box 196650 • 4700 S. Braga -a Street
Anchoragc, Alaska 99519-6650 • (907) 343-8301
iittp: ci.ancIioragc.ak.us
8/23/2001
Greg Eberle P.E.
Eberle Engineering Services
3875 Mariah Dr. Eagle River, AK 99577
Subject: Waiver Request for Lake Ridge Terrace #1 Block 8 Lot 7
Waiver Request #WR010051
Parcel ID #051-322-23
Permit #SW010332
Dear Greg Eberle:
Department of
Public Works
Your request for a waiver of the required 100 feet horizontal separation from the
septic tank to private well has been approved. The approved separation distance is 90.0
feet.
This waiver approval applies to the existing septic tank to private well separation only.
1> ny f"Lure upgrade to the on -site wastewater disposal system will require all separation
distances be met or another approval from this department.
If there are any further concerns or questions regarding this waiver, please call our office
at 343-7904.
Sincerely,
Daniel J. Ro
Civil Engineer
On -Site Water & Wastewater Program
Municipality of Anchorage o p Auf�
Development Services Department,'
• '` Building Safety Division
On -Site Water and Wastewater Program " 11
4700 Bragaw Street s r r
P.O. Box 196650 Anchorage, AK 99519-6650
www.ci.anchorage.ak.us
(907)343-7904
Waiver Review Worksheet
1
WR#: WRO10051 PlD#: 051-3 2-23 HA#: Permit#:
Date Received: 7111/01
01
Legal Description: Lake Ridge Terrace Blk 8 Lot 7
Engineer: Greer Eberle, F.E. - Eberle Engineering Services
3875 Mariah Dr. Eagle River, AK 99577
Applicant: Charles F. Cobb
Waiver Requested: 90 Feet Tank to Well
Criteria: Geology Points:
A. Water Table
u. 1Jull:'JVI PLIUI I
C. Permeability
D. Water Table Gradient
E. Horizontal Separation
Total:
■•ra'rrrrr'■rrrr"rrrrr'■rrrr�rrrr■rrrr�rrrr�'■rrrr`rrrrrarrrr�rrrrLrrrrsrrrr�rrrrrrr�
Waiver is Granted: Waiver is not Granted:
List Conditions or Reasons for above: 5164 ' if ffAlch4050
Dater " 2- 3 —,! / By: 19AAI
Name of Reviewer
r�r'rrrr'riarrrr`•rrrrrrr�l�r���■rr���rrrr�'■rrr�■rrr'■lrrr'i•rrr�Lr�rPr�rr�ir�r■'�rr�
Rec#: 7097 Amount: $625.00 Date Paid: 7/11/01
WAIVER REQUES
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NORTHERN TESLABORATORIES, INC.
1 3330 INDUSTRIAL AVENUE FAIRBANKS, ALASKA 99701 (907) 456-3116 • FAX 456-3125
0 8005 SCHOON STREET ANCHORAGE, ALASKA 99518 (907) 349-1000 • FAX 349-1016
POUCH 340043 PRUDHOE BAY, ALASKA 99734 (907) 659-2145 • FAX 659-2146
Charles & Karen Cobb 1 ' t. � —` "" ' 8 "1" KC RJ `��� ���.1����,-� Report Date: 10/4/00
P.O. Box 771955 Date Arrived: 9/8/00
Eagle River, AK 99577 Sample Date: 9/8/00
Attn:
Sample Time: 8:30
Collected By:
Client ID: Bathtub ** Legend **
Client Project #: MRL = Method Report Level
Source:
MCL = Max. Contaminant Level
B = Present In Method Blank
NTL Lab#: A168425 E = Estimated Value
Sample Matrix: Water M = Matrix Interference
Comments: H = Above MCL
D = Lost To Dilution
Method Parameter Units Result Date Date
MRL Prepared Analyzed
EPA 150.1
pH
SM 2320 B
Alkalinity (CaCO3)
SM 2330 B
Langelier Index (cry, 10 Degree C
SM 2540 C
Total Dissolved Solids
SM 4500 E
Nitrate-N
.
Reported By: Wendy M. MitcheIl
Anchorage Chemistry Supervisor
Unit 8.93 9/8/00
mg/L 242 1.00 9/16/00
-0.55 10/4/00
mg/L 302 10.0 9/9/00
mg/L <MRL 0.10 9/9/00
GRE I ANCHORAGE AREA BO" "'7*H
Department of Environmental Quality
3330 C Street
Anchorage, Alaska 99503
INSPECTION REPORT ON -SITE SEWAGE
DISPOSAL
SYSTEM
NAME
MAILING ADDRESS
PHONE
LOCATION_Cjv ttLik%.,e_ —LEGAL DESCRIPTION
T
SEPTIC TANK:
DISTANCE
Ste-c—
NUMBER OF
FROM WELL —MANUFACTURER
«c MATERIAL
—COMPARTMENTS
INSIDE LENGTH
—INSIDE WIDTH —LIQUID DEPTH
—LIQUID CAPACITY
N00 GALLONS.
4449-710-01FUN
I
NUMBEROFPITS—. DIAMETER _ OR WIDTH _k!�, LENGTH-131, DEPTH It
LINING MATERIAL 1-0i
CRIB SIZE: DIAMETERDEPTH DISTANCE FROM: WELL
TOTAL EFFECTIVE
BUILDING FOUNDATION NEAREST LOT LINE 7-14 . ABSORPTION AREA (WALL AREA) 3q(4 SQ. FT.
ADDITIONAL ABSORPTION
L
WELL, �j.4 i
TYPE CONSTRUCTION DEPTH DISTANCE FROM:
BUILDING NEAREST NEAREST SEPTIC SEEPAGF
FOUNDATION LOT LINE SEWER LINE—, TANK—, SYSTEM
CESSPOOL — , OTHER SOURCES
APPROVED— DISAPPROVED
DISTANCES:
INSTALLED BY:
PIPE MATERIAL:
e "r
r C;-r 1'ret'g,
LOT SLOPE:
REMARKS:
REMAR
DIAGRAM OF SYSTEM
Form No. EQ-031
G.A.A.B.
GRL, ..R ANCHORAGE AREA BOROUGh
DEPARTMENT OF ENVTRONMFNTAL a s
QUALITY UAL
Q � �.)� � _
3330 ""C"" Street ° ' 60RO1G1
ANCHORAGE, ALASKA 99503 CI{ORAGEAREA
GREAiEU� E RphME TA CIUALIiY
OVA
Performed For Berg Underground Construction Dated Performed November 2, 1973
Legal Description: Lot 7 Block 8 Subdivision fake Ridge Terrace. Add. #i
This Form Reports Soils Log xx Percolation Test
- Depth Soil Test Must Be Logged To 4' Below Proposed Seepage System -
Feet Soil Characteristics
2 --
4 Brown Silty Gravel
6
8 with sand pockets and seams by 6'
0 1— with sandy gravel seams below 10'
2
4'
6
8
0
(GW)
Was Ground Water Encountered? No
If Yes, At What Depth?
0.
v`0'6
Reading
1
Date
Gross Time
Net Time Depth to H2O
Net Dropl
PprrniAtinn
Rato
Proposed Installation: Seepage Pit xx Drain Field
Depth of Inlet Depth to Bottom of or Trencf
COMMENTS: 190 sq. ft. of draina a area is required per bedroom'
Pest Performed BY R. E. Carlisle
—_ r. Date Certified BY:
ALASKA MINERAL & MATERIALS LAB Date: