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Home My WebLink AboutLAKE RIDGE TERRACE #1 BLK 8 LT 7is ke Ridg rr awl Lot 7 #051 -322-23 35.5' 30.5' 35.5' 30.5' 20.3' 24.3' 20.3' 24.3' SAUNA SHE D GARAGE RESIDENCE LEGEND FOUND 5/8" REBAR, NO CAP EDGE OF GRAVEL DRIVEWAY DECK FENCE OVERHEAD UTILITIES POWER POLE EDGE OF ASPHALT FOUND CONCRETE ROW MON. RECORD DATA PER PLAT #64-82 SEPTIC PIPE WELL SEPTIC TANK LID EDGE OF WATER ELECTRIC METER GUY WIRE GABION WALL TIMBERLINE SURVEYING AND MAPPING 17035 BARONOFF AVE EAGLE RIVER, AK 99577 907-242-5320 ryan@timberlinealaska.com FILE NO.: 25.268 SCALE: 1" = 20 FEET DATE: 12/21/2025 SHEET: 1 of 1 MOA GRID: NW0553 SCALE: 1" = 20 FEET(11"x17") 20'0' 40' AS-BUILT OF: ADDRESS: 14407 W LAKE RIDGE DR, EAGLE RIVER, AK LOCATED IN: ANCHORAGE RECORDING DISTRICT PORTION OF LOT 7, BLOCK 8LAKE RIDGE TERRACE SUBD.FIRST ADDN., PLAT #64-82 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 //� �1! /'rt C ` 0() Gal. Yam% �( } ( o �( <0.t `^. Material: LIFT STATION Number of Compartments: KF,pntk �'3 �0— { /� `� Size:Manufacture '% G�"�_Pump on" level aka( Pump off level at: 7 Wgh water alarm at: in —� - —� ` Pump Make & Model 5:1atl�i,S4,2Gk� Electrical Inspect,iopps perlo ed by. .�Vr,.c'2all 2 f F P ,; av� _NSWicl: rr T 7 LOT 6A 7 3 6 .;TKO 2:z_ 1 T 3 AAAJ\p4_. 30.113 04 _T X �4 1, iiAi LOS HOUSE ti TI vP 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 J 3 FIS_-Ugf 3 Lr3T 7ASS S A - A/ 78,(, LOWER FIK5 LA IBC Z A-'15IN6� 72,71 SC-Prl& 2- Z 71,6 7 7 75' T-2- 7,5; Hopu-4-owrAL _'SCALE k V i G lh' Lo Cl 'A 4 CHAR a 0 3B '§,')32 700 AZI� olv 41j--rs7A'r1O1V A / '>/L FILL OVER ORi6-INAL AFAC(� MIN. WLK b, L � �Zz_J 7 7,7 _2 5 r L 71 S V\'A 7,11- P, i-, F. vE I- 701 19,0, c F / 6Z , t VER-rIG-A L (-,'-ALE I "/= Zo' * 1'qblci\-TES PR'bjt�_:c-tioN 576 UT- 1-01 MON 10:01 AM ORENCO FAX NO, 541 459 2884 P. 1 a } `� o"o'��- ` w iri � m = I t"s 0 O a. m N m EL m $ m co m io N N to to U 0 n � 2 it g u N 0 0 o -qn 4 � 2. a m o L^ a m $ O Nt tCn IN 0 4 9 G O S G O O iD 4 0 pi N 0? Total Dynamic Head (TDH), feet Cn post•it* Fax Note 7671 r0 t>s A,11 f L ro r+ O 4� (9 CD fNt), CL »,..,.---^-.p�..^�.��/"��`j_��"_—_ _Phone k 1G D 7- �91�L� 11?-- �y. Fax k 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 10 00 CAR OUSE top Lot 5 Fvf. wpu I App1-o1,V\IjI (OC4�-, Ir cr� /PI 0 cl� F,t - F v,+ , o Y,, 5 6 a- s -, 4 0,.V co C>4- Lof A Arh+mrw AJ .. � = 1hn44 rake S" rc, � 0 40 80 ft i - ---4— i SCALE 0 i Aq 0 . ............ 1 c r8 i:3 32 �— cm 0. F E s Fl�axc K-11 kV` Lb t 1 ?y fo Kect-ve co vj�t H-b tt5 INA of Lc�-T 7 C—Rr6S '_5EC_T(Dk/ A —A' LD VVER F I K 5 LA RC 78, it �00 4AI- A60 ON 41FTVARON (bF_fs_f5_r) H DRFU NTAL5 CALE t>IL lip AAW_ I JE L 7 t,,T VERMCA L S'CALE I "/= 2.0' *_ imblcATES PROJECTION 70 5-6 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 6 i _, J 5 iA 7 � limy 8 9 =0 =s =3 �A i 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 NYnifrrinpl @� l4jj(�j 1 1-%) =6 -I =7 =8 fmplwm G'3� mKRAm �:am I� Am mmlmmlgwm 20 -[__j . ... 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 3 t 1�� fi �lrot.JML ,.AcND W1 4- mvk- 5 t n i> i - , l t yn tiny GJ 11af'" ue Sof t 65 — Wi Vl �' v eh� 6 A VVOW vt - q y,Q Kg� 9 10 11 12 13 14 1G. 16, 17- 18• 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 % U - 9 0 10 v. n 12 v; 13 i 14 t 15 c;:, e---^- -►'e'' 16 z a. rioa��.ouro�e��q?e�'i5 17 i►'—N ao or coe`' "¢'�,Tiy` Jac•-,1 18 t�0 •e°. ,i aa�Y eo ^a:en uses«u o'c- - �r �j t� 1^' ti ��c V�u 6A01ee9 �vao•vR Ode eo ¢-+-i �� Y- Loui; A. Eut2ra •+ �L 20 COMMENTS 0 4� WAS GROUND WATER L ENCOUNTERED? /" 0 P E IF YES, AT WHAT DEPTH? 114 Reading Date Gross Time Net Time Depth to Water Net Drop Sri y 5 o a y �i t , 3d 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 '/ D& E FIE R)F,6C F 57 U 0D. PI-0 Ck 8 4 6 7- 0 I 0 WAIVER /?EQUE.5r 4114AIVER WI401005-1 IPA I VE)? )? E47 U f 5-1- FOR 0//- L 07- WA MR WF4t ZO 7-4#V,,k' OF Fa FEET. — SEPTtC *fi'+Alk P)97A— .f Ewa T14#vAe Is coA,,.f 1 %rkc7-,CJ9 i A, A j-o I L. rle A r A PP R 0 41 M r5 L Y At A111 Ao'. 014 T Y P Y ri? 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PoCu T.s a.Orrn r�r�iE w rtt 4 7 37, _ x 4.o 0 iN ri aav coo 17/ AAA pr ?mCA61-1TY 0 + I.S t(T7 7 7 TER %dLE' GRAIENT poi? 1 z aiv r#L se hr9 9 Wrl ON � 13" ( 0 AICL u j'l ®kv fir ? mwr w)+r✓s )c 4.7 mr i 2.9 0 AT 4.4, Lal . fr tv;lz Yd"e-A 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: MUNICIPALITY OF ANCHORAGE Development Services Department Phone: (907)343-7904 On -Site Water & Wastewater Section Fax: (907)343-7997 Parcel ID 051 -322-23 Certificate of On -Site Systems Approval OSC251421 Expiration Date: 91112026 Legal description LAKE RIDGE TERRACE #1 BLK 8 LT 7 Site address 14407 W LAKE RIDGE DR Current property owner(s) COBB CHARLES F & KAREN D TRUST X The On-site system(s) is/are approved for 3 bedrooms Conditional approval for bedrooms, with the following stipulations: Comments or conditions: By: Original Certificate Date: 1/27/2026 This,96dificate of On -Site Systems Approval (COSA) is intended to demonstrate the subject s em(s) is/are in substantial compliance with municipal code. The Municipality of Anchorage, Development Service Department (DSD) issues COSAs based upon representations provided by an independent professional engineer. The Municipality of Anchorage is not responsible for errors or omissions in the professional engineer's submittal. ATTACHMENTS: COSA Checklist X Absorption Field Advisory Tank Age Advisory X Other Well Flow Advisory X Nitrate Advisory Arsenic Advisory MUNICIPALITY OF ANCHORAGE X \ Development Services Department Phone: 907-343-7904 On -Site Water & Wastewater Section Fax: 907-343-7997 Certificate of On -Site Systems Approval Application 1. GENERAL INFORMATION Parcel I.D. 05132223000 Complete legal description Lake Ridge Terrace #1 Block 8 Lot 7 Location (site address) 14407 Lake Ridge Drive Current property owner(s) Charles Cobb 2. ON-SITE SYSTEMS SIZED FOR 3 BEDROOMS 3. TYPE OF WATER SUPPLY: FN� Private Well serving #_1 Day phone 907-748-2942 dwelling units ❑ Other Non-public well as regulated by MOA ❑ Water Storage ❑ Community Well or Public 4. TYPE OF WASTEWATER DISPOSAL: Fo� Private Septic ❑ Private Septic serving 2 dwelling units ❑ Holding Tank ❑ Community Septic or Public Sewer 5. SEPTIC TANK:❑ Steel ❑ Plastic ❑ Concrete ❑ Fiberglass Age - See advisory if steel or fiberglass older than 20 years 6. ABSORPTION FIELD: ❑ AWWTS ❑ Bed 0 Deep Trench ❑ Wide Trench ❑ Seepage Pit Waiver request for: Expedited review requested: ❑ Distance: By applying for this entitlement, this property is subject to inspection by municipal On-site staff to verify the accuracy of the information provided. COSA Fee $ S50 Waiver Fee $ Date of Payment Y115 1zS COSA # 05(25/1-(2-/ Date of Payment Waiver # COSA Applicafion_Apr2025.doc COSA Checklist_May2025.docx COSA Checklist Legal Description: Parcel ID: If more than 1 well and/or septic system on lot, provide separate checklist. Structure served by this system ____ A. WELL DATA Well log is filed with Onsite (or attached) Date drilled Total depth ft Cased to ft Sanitary seal is functioning correctly Wires are properly protected Casing height (above ground) in. Date of flow test for COSA Static water level at beginning of test ft. Well production at time of test gpm Water storage tank volume gallons Well disinfected for coliform test? Yes No Coliform bacteria is Negative Nitrate mg/L Nitrate less than MRL (ND) Arsenic ug/L Arsenic less than MRL (ND) Collected by Date Comments __________________________________________________________________________________ B. TANK DATA Measured operating fluid level in septic tank Date of pumping Required maintenance completed, if AWWTS Comments: C. LIFT STATION Required maintenance completed Age of lift station years Lift station material Comments: D.DISPOSAL FIELD DATA Which system tested (date installed) ALL standpipes present per record drawing Total measured depth from grade ft (max) Measured depth to pipe invert from grade ft (min) N/A – pressurized field. Per record drawings, field is insulated. Monitor tubes go to bottom of effective. If not, state depth into effective Presoaked required if (Required if house vacant or field not used for more than 30 days prior to date of test) Gallons introduced gallons date Any rejuvenation treatment (past 12 months) If yes, enter date Adequacy test date Results Pass Fluid depth prior to test in Water added gal New fluid depth in Elapsed time min Final fluid depth in Absorption rate gpd FIELD STATUS – POST RECOVERY Effective depth (per record drawings) in Effective depth used in Effective depth remaining in Comments/Deficiencies: COSA Checklist_May2025.docx E. SEPARATION DISTANCES From Well on Lot to: (Please enter distances if less than required) Septic Tank/Lift Station on Lot > 100’ Yes if No ft Neighboring Tank > 100’ Yes if No ft Disposal Field on Lot > 100’ Yes if No ft Neighboring Disposal Fields > 100’ Yes if No ft Sewer Line/Main > 100’ Yes if No ft Sewer Manhole/Cleanout > 100’ Yes if No ft Sewer Service/Septic Line > 25’ Yes if No ft Holding Tank > 100’ Yes if No ft Animal Containment > 50’ Yes if No ft Manure/Animal Excreta Storage > 100’ Yes if No ft N/A – Served by Community Well (not on lot) or Public Water From Septic/Holding Tank and Disposal Field(s) on Lot to: (Please enter distances if less than required) Tank to Foundation > 10’ Yes if No ft Field to Foundation > 10’ Yes if No ft Tank to Property Line > 5’ Yes if No ft Field to Property Line > 10’ Yes if No ft Water Main/Service Line > 10’ Yes if No ft Surface Water > 100’ Yes if No ft Wells on Adjacent Lots: Wells > 100’ Yes if No ft Community Wells > 200’ Yes if No ft If tank or field is under driveway comment below F.ENGINEER’S COMMENTS G.CERTIFICATION & 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, indicates that the on-site water supply and/or wastewater disposal system appears to comply with applicable Municipal and State codes, ordinances, and regulations in effect at the time of installation, unless noted otherwise. Name of Firm Phone Engineer’s Printed Name Date 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 Tank Age Justification 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, a currently undocumented system), a 700-gallon steel lift station (installed in under the 2001 permit). This letter is to serve the purpose of address the current 1,000-gallon tank’s age and integrity. During the COSA on September 6th, 2025, the operating water level for the septic tank remained at a fluid level of approximately 4.1 feet for the duration of the test. After this test, the home became vacant and has remained vacant to current day. On January 9th, 2026, the water level in the tank was measured to be approximately 4.0 feet, which is consistent with the water level during the COSA. Additionally, the owner provided a document stating that the tank was placed in 1997. Given the findings of the COSA and this document, it appears that the tank is approximately 28 years old, rather than the previously recorded tank installed in 1973. MOA’s Policy W.05 states that a steel septic tank with a conventional coating that is more than 20 years old, but less than 30 years old, will be issued an Advisory Notice explaining that the tank may be near the end of its life. In this situation, it is appropriate to issue that advisory and we are seeking an Unconditional Cosa. In the future, if the tank were to need replacement, the owners may also utilize the current tank replacement permit after re-issuance of the permit (if more than a year has elapsed from October of 2025. 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. Sincerely, Eli D. Ward, PE Principal Engineer 1/13/2026 Affidavit regarding On-Site Permit Number SW010332 and the respective application Lot 7, Block 8, Lake Ridge Terrace 1 of 2 Eagle River, Alaska The permit application and permit number SW010332 describe and include the existing septic tank and a new lift station and drain field. The existing septic tank was installed in 1997 by Mike Kowaleski, the property owner at the time, and a contractor, a 1000 gallon steel tank manufactured by Anchorage Tank, as indicated in the On-Site Wastewater Disposal System Inspection Report dated September 20, 2001. The tank was observed during construction in accordance with Item 3 of Specification B.1 included in Section 2 of the permit application and found to be in good condition, as seen in the attached photographs. The liquid level in the septic tank was observed at 4.1 feet above the bottom during the recent COSA inspection on September 6, 2025, indicating that the septic tank continues to perform according to the requirements of the design and the respective municipal regulations. Attested to this day, September 12, 2025 Charles F. Cobb, P. E. Alaska Registration AELC8332 Attachments: Photo 1 Septic tank at Lot 7, Block 8, Lake Ridge Terrace Photo 2 Close-up of septic tank at Lot 7, Block 8, Lake Ridge Terrace Affidavit regarding On-Site Permit Number SW010332 and the respective application Lot 7, Block 8, Lake Ridge Terrace 2 of 2 Photo 1 Septic tank at Lot 7, Block 8, Lake Ridge Terrace Photo 2 Close-up of septic tank at Lot 7, Block 8, Lake Ridge Terrace POST IN A CONSPICUOUS PLACE ALL WORK MUST BE INSPECTED Field Inspection Request required 2 working days in advance of starting work and 2 working days in advance for final inspection. Call (907) 343-8206 (voice recorder) for scheduling. Permit is not valid without the call-in and also must include the one -call ticket (utility locate) number. MUNICIPALITY OF ANCHORAGE - RIGHT OF WAY DIVISION 4700 ELMORE ROAD TELEPHONE (907) 343-8240 EMAIL: moarowrequests@muni.org RIGHT OF WAY PERMIT -NtI'C11r `0 .Sri �r. 1)cI>art111c11t R261090 Type: Encrchmnt Status: Issued Grid: NW0553 Date Applied: 01/23/2026 Date Issued: 01/23/2026 Issued By: PWMSW Construction Start Date: 01/23/2026 Last Updated: 01/23/2026 Last Updated By: PWMSW Permittee: COBB CHARLES F & KAREN D TRUST Work Order: Utility: Contact Person: Eli Ward, 907-398-5272 Primary Inspector: ROW Lead Address/Loc: 14407 W LAKE RIDGE DR, Eagle River - @ Old Glenn Legal Description: LAKE RIDGE TERRACE #1 BLK 8 LT 7 G:0553 Original Work Drain field & stand pipe encroaches V into the West Lake Ridge Drive Right of Way. Description: Fee Description Permit Summarized Financial Transactions See reverse for requirements/remarks. Quantity Amount 1 $120.00 Total Fees: $120.00 I have read and understand both sides of this permit. I agree to the terms and conditions; and I certify that all work will comply with federal, state, and municipal codes and regulations and the provisions of this permit. Signature: 6&a Karen D. Cobb Trustees Date: 01/24/2026 ,1�ent. MUNICIPALITY OF ANCHORAGE s� Development Services Department q Right of Way Section Ucpartmcnr ENCROACHMENT PERMIT R261090 THIS AGREEMENT made this 23th day of January 2026, by and between Charles F & Karen D Cobb and their heirs, administrators, and assigns, hereinafter called "PERMITTEE", and the Municipality of Anchorage, a municipal corporation organized and existing under its Charter and the laws of the State of Alaska, hereinafter called the "PERMITTER". WITNESSETH: WHEREAS, PERMITTEE is the owner of the following described real property: LAKE RIDGE TERRACE #1, BLK 8, LT 7, according to the official records thereof, on file in the office of the District Recorder, Anchorage Recording District, Alaska, and; WHEREAS, PERMITTER owns and/or maintains the real property more particularly described as follows: The 60 FOOT RIGHT OF WAY OF WEST LAKE RIDGE DRIVE, immediately on the south side of PERMITTEES property as shown on Plat No. 64-82, on file in the office of the District Recorder, Anchorage Recording District, Alaska, and; WHEREAS, PERMITTEE has placed a leach field & standpipe upon the referenced real property which encroaches 1' upon the PERMITTER'S West Lake Ridge Drive Right of Way. NOW, THEREFORE, it is mutually agreed between the parties hereto that: The PERMITTER, acting through the Director of Development Services Department, hereby grants to the PERMITTEE the privilege of allowing the leach field & standpipe to encroach 1' upon the PERMITTER'S 60' Right of Way, as shown on "Attachment A," included herewith. 2. The PERMITTEE agrees forever to indemnify, defend, save and hold harmless, the Municipality, its officers and employees, from any and all lawsuits, claims or actions brought to any person for or on account of damage to property or injury, disease, illness or death of persons, including all costs and expenses incident thereto, arising wholly or in part from or in connection with the existence of, alterations, maintenance, repair, renewal, reconstruction, operation, use or removal of the encroaching leach field & standpipe, as placed upon the PERMITTER'S 60' Right of Way. 3. The PERMITTEE shall not assign or transfer any of the rights granted herein to another individual or company without first notifying and securing the approval of the Director of Development Services Department. 4. This Agreement and Permit grants PERMITTEE no interest in PERMITTER'S real property whatsoever. except only the encroachment rights described herein. 5. The PERMITTER reserves the right to revoke this permit upon twenty (20) clays written notice to the PERMITTEE. The PERMITTEE agrees upon such notice of revocation, to move said encroachment(s) from the 60' Right of Way in which it is placed. Should the PERMITTEE refuse or fail to comply with said written notice, the PERMITTER may, without further notice to the PERMITTEE, remove or cause to be removed the encroachment(s). and the PERMITTEE hereby agrees to reimburse the PERMITTER for all costs incidental to the removal thereof. In addition to the nurtual promises heretofore made, the PERMITTEE has paid the PERMITTER a one-time permit application fee of $120.00. The PERMITTER hereby Nvaives the annual fee of $315.00. IN WITNESS WHEREOF, the parties hereto have hereunto set their hands and seal the day and year first hereinabove written. GRANTEE: 7 �� c � Charles F Cobb - Owner Karen 1) Cobb - Owner GRANTOR: MUNICIPALITY OF ANCHORAGE jt_ Right of Way Supervisor MUNICIPALITY OF ANCHORAGE Development Services Department Phone: 907-343-7904 On -Site Water & Wastewater SectionFax: 907-343-7997 Lift Station/Pump Vault Mntr!eet 'n e Log Owner 07 "5tvNAdr�� §eatic Tank: ASludge level inches -Pumping: required yes -Pumping completedX& no Lift station: ,!Pump basket cleaned a no -Effluent filter cleaned no i!Control floats cleaneda no •Proper float settings confirmed a no ,Operation satisfactory a no Alarm System: -Dedicated electrical alarm circuit 115N no -Audible and visual alarm inside dwelling 491 no -Alarm system operation satisfacto not satisfacto Manhole Riser -Ground water intrusion at riser to tank connection Les -Ground water intrusion around pipe penetrations o -Weep hole functional no ,Manhole lid: Functionales s o no Insulated eProperly Secured e the ?All manufacturer required inspections and maintenance completed pe no Comments: 1 0 _ 14 Qualified Maintenance Provider: Technician / Company Signature 6. Date of maintenance Date MUNICIPALITY OF ANCHORAGE DEVELOPMENT SERVICES DEPARTMENT f s }'°�� 907-343-7904 � a On -Site water and wastewater Section ;. Fax: 343-7997 www.muni.org/onsite � ---� Well Water Advisory Certificate of On -Site Systems Approval # OSC2551421 Subdivision: Lake Ridge Terrace #1, Block: 8, Lot: 7 This well's productivity was determined to be 0.5 gallons per minute. The recommended well productivity under (AMC 15.55) for a 3 -bedroom residence is 0.31 gallons per minute or 150 gallons per day per bedroom. Water storage may be necessary to accommodate your needs. This advisory must be attached to all copies of the subject Certificate of On -Site Systems Approval. MUNICIPALITY OF ANCHORAGE DEVELOPMENT SERVICES DEPARTMENT � 4 On -Site water and wastewater- Section www.muni.org/onsite Septic Tank Advisory Certificate of On -Site Systems Approval # OSC251421 Subdivision: Lake Ridge Terrace #1 Block:8, Lot: 7 NM The septic tank for this property is 29 years old. The average life of an asphalt coated steel septic tank is 20 years. Typical replacement costs are $15,000 or more, not including engineering, surveying, MOA permitting fees or site restoration. Steel septic tanks utilizing "Coal Tar Pitch" coatings are subject to corrosion as the steel reacts to water and rusts. These tanks have a finite lifespan buried in the ground. These tanks can become structurally compromised and pose a health risk. They could collapse and/or leak untreated wastewater directly into groundwater. In the interest of protecting public health and the environment, the Municipality of Anchorage Development Services Department has issued Policy W.05 Standard of Care Regarding the Inspection of Steel Septic Tanks when Performing COSA Inspection. Please request a copy of this policy from the Department if interested. This advisory must be attached to all copies of the subject Certificate of On -Site Systems Approval.