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Home My WebLink AboutBIRCH TREE ESTATES BLK 1 LT 7E T. Lo I I /V unicipality Anchorage P.O. BOX 6650 ANCHORAGE, ALASKA 99502-0650 (907) 264-4111 TONY KNOWLES, MA YOR DEPARTMENT OF HEALTH & HUMAN SERVICES September 30, 1986 Mr. Hank Peck Anchorage, Alaska Subject: Lot 7 Block 1 Birch Tree Estates Subdivision Dear Mr. Peck: We regret to inform you that in the opinion of this department your property will not support a conventional on-site septic system. After careful examination of the information provided by your engineer and following an in-field investigation, we found the following factors in your case: The present of shallow groundwater: per Anchorage Ordinance 15.65.060 A 3, a four foot vertical separation is required above groundwater. Concerning this, your engineer suggested construction of a curtain drain to intercept the shallow water, however, Section 15.65.060 B 3, would require such a drainage to be 100 foot downslope of your neighbor's septic system and 30 feet upslope of your own. Thus, effectively reducing your reserve area for the original and one replacement site. Me The presence of a natural slope greater than 25%: per Anchorage Ordinance 15.65.040 I 2 and 15.65.060 B 2, no system may be constructed within 50 feet upslope of such a break in the terrain, whether natural or man made. Be The presence of surface water: per Alaska Statute 05.25.100 (5) and Anchorage Ordinance 15.65.060 B 1, a septic system must be 100 feet from any surface water. This would preclude, not only the western half of your property but portions of the southern half as well, for the purpose of an on-site septic system. Mr. Hank Peck Lot 7 Block 1 Birch Tree Estates Subdivision September 30, 1986 Page Two These factors, as well as the restrictions listed under Section 15.65.020, A, C of the Anchorage Ordinance, prevent the issuance of a permit for a conventional on-site septic system. We regret having to deny your application and the problems this obviously presents. Sincergly, . Dan Bolles Engineering Tech On-site Services DB/ljw TECHNICAL CIVIL & ENVIRONMENTAL ENGINEERING * ENERGY CONSERVATION & ANALYSIS TttEODORE F. MOORE, P.E. 14530 ECHO ST. PH: (907) 345-1355 September 12, 1986 ANCHORAGE, ALASKA 99516 M.O.A. Dep't. of Health and Human Services P.O. Box 6-650 Anchorage, AK 99516 Attn: Dan Bolles RE: Proposed drainfield - Lot 7, Blk.1, Birch Tree Estates Dear Mr. Bolles: Per your request to Mr. Hank Peck for additional information regarding the proposed drainfield for the subject property, I am submitting the enclosed Plan and Crossection and narrative. 1. Based on the soils test results, the proposed alignment parallels the crest of an indistinct break in slope, as shown on the crossections. Due to poorer soils further up-slope, it is not feasible to stay 50 feet away from the steeper portion of this slope which equals or exceeds 25% in some locations, nor does there appear to be a good engineering reason to do so. 2. While the soils below the toe of the steeper portion of the slope are poorly drained, there is no surface water in undisturbed portions uphill from the manmade cut above the house on Lot 8 where there is some seepage. While, of course, I cannot guarantee that septic effluent will not surface at the toe of the slope, I see no reason to be overly concerned that it will do so. 3. Through careful layout, it does appear possible to maintain the required 100 foot separation from all presently existing surface water. While digging test hole #2 a small amount of seepage was noted at approximately 5 feet, however this did not influence the stabilized water level which was measured to be at 7 feet in the monitor tube. 4. This lot does have a lot of subsurface water, particular- ly on the north half, and well designed curtain drainage along the east boundary connecting to an improved drainage ditch beside Riverton Avenue is recommended. 5. As noted in the specifications, the proposed site for the soil absorption system displays significant local variations in both soil stratification and depth to groundwater. During construction, field adjustment of the design should be expected based on additional soils information. Please questions. feel free to call me if you have any additional cc. Hank Peck Sincerely, Ted Moore, P.E. MUNICIPALITY OF ANCHORAGE DEPT. OF HEALTH & ENVIRONMENTAL PROTECTION SEP ~gfj~ RECEIVED Lot 7, Block 1, Birch Tree Estates On-Site 3-Bedroom Wastewater Disposal System SPECIFICATIONS 1. Septic tank to be 1000 gallons and Municipally approved. 2. Ail pipe and monitor tubes to conform with Municipal requirements. 3. The area proposed for the soil absorption system is characterized by significant local variation both i~n soil stratification and in depth to ground water. Field adjustment of the design may be required at the time of construction based on additional test hole data. 4. The proposed system consists of a 5 foot wide drainfield at a depth of 3 feet with no imported sand in the vicinity of T.H. #1, and 4 feet of imported sand in the vicinity of T.H. #2 to provide vertical separation from the water table. The total length should be 75 feet based on an average soil rate of 125 s.f./bdrm. A minimum of 6" gravel shall be placed beneath distribution pipes, with an additional 6" surrounding and covering them. 5. A gravity flow system is intended. If final building location necessitates a lift station, this would require an engineered design and prior approval of the Municipality. 6. Cleanouts, monitor tubes, insulation and barrier shall be per Municipal requirements. permeable silt 14530 Echo Street Anchorage, Alaska 995t.~ IR= I00~ ~ ~q I -I-' ~ P 1.. ,~ IX[ LOT PIatt0~ Techhic~! S~VlC~.~ 14530 Echo Street Anchororge, Al~ska 9n.c,n 8 MUNICIPALITY OF ANCHORAGE MEMORANDUM 91-015(Revo1/81) SOILS LOG MUNICIPALITY OF ANCHORAGE DEPARTMENT OF HEALTH AND ENVIRONMENTAL PROTECTION 825 L. Street. Anchorage, Alaska 99501 264-4720 SOILS LOG - PERCOLATION TEST PERCOLATION TEST PERFORMED FOR: LEGAL DESCRIPTION: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 2O SLOPE SP DATE PERFORMED: 7'//17 //~" SITE PLAN WAS GROUND WATER V S ENCOUNTERED? ~f L E IF YES, AT WHAT _l i! _ DEPTH? ,~-.~ ~l,~i' [ ',.Reading Date Gross Net (~1 ~) Depth,o Net (i ,, Time Time i ! Water Drop (minutes/inch) ~ ~/'~, FT CERTIFIED BY: ~~ ~~.DATE: COMMENTS PERFORMED BY: FI 'i f Fec ic.f CE- 3589 · ....'('(..:';~ CO LATt O N RATE I VV TEST RUN BETWEEN ~'~ FT AND 72-008 (6/79) MUNICIPALITY OF ANCHORAGE DEPARTMENT OF HEALTH AND ENVIRONMENTAL PROTECTION 825 L. Street, Anchorage, Alaska 99501 264-4720 SOILS LOG - PERCOLATION TEST SOILS LOG [] PERCOLATION TEST PERFORMED FOR: H~ ~' P~-~ ~' LEGAL DESCRIPTION: Lo~ ~ 8 lock .1 .,, Pf 1 2 3 4 5 6 7 8 F~-.t 9 lO 11 12 13 DATE PERFORMED: SLOPE 14 16 ~7 ~ THEODORE F. MOORE 18 CE-3589 19 20 COMMENTS PERFORMED BY: SITE PLAN WAS GROUND WATER S ENCOUNTERED? y L '0 P IF YES, AT WHAT DEPTH? ~Y" ~ ?~ O&~ Gross Net Depth to Net Reading Date Time Time Water Drop PERCOLATION RATE (minutes/inch) TEST RUN BETWEEN FT AND ~ FT CERTIFIED BY: ~~ ~ ~DATE: 72-008 (6/79) SOILS LOG MUNICIPALITY OF ANCHORAGE DEPARTMENT OF HEALTH AND ENVIRONMENTAL PROTECTION 825 L. Street, Anchorage, Alaska 99501 264-4720 SOILS LOG - PERCOLATION TEST PERCOLATION TEST PERFORMED FOR: LEGAL DESCRIPTION: Pt. DATE PERFORMED: SLOPE SITE PLAN 10- 11- 12- 13- 14- 17- 18- 19.- 20- COMMENTS WAS GROUND WATER ENCOUNTER ED? IF YES, AT WHAT DEPTH? :~,,~. t THEODORE F. MOORE "CE- 3589 ., . ........ Reading Date Gross Net Depth to Net Time Time Water Drop PERCOLATION RATE (minutes/inch) TEST RUN BETWEEN FT AND / FT PERFORMED BY: F~t~l~f '~c4,~;,,,l CERTIFIED BY: ~~ ~1~- DATE: 72-00S (6/79) MUNICIPALITY OF ANCHORAGE DEPARTMENT OF HEALTH AND ENVIRONMENTAL PROTECTION 825 L. Street, Anchorage, Alaska 99501 264-4720 SOILS LOG - PERCOLATION TEST SOILS LOG PERCOLATION TEST PERFORMED FOR: LEGAL DESCRIPTION: L~*~ '~ 1 2 SLOPE DATE PERFORMED: SITE PLAN 10 11 12 13 14 15 16 17 18 19, 20 COMMENTS THEODORE F. MOORE · . CE- 3589 WAS GROUND WATER ENCOUNTERED? IF YES, AT WHAT DEPTH? Reading Date Gross Net Depth to Net Time Time Water Drop PERCOLATION RATE (minutes/inch) TEST RUN BETWEEN FT AND FT PERFORMED BY: 72-008 (6/79)