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Home My WebLink AboutT15N R2W SEC 25 LT 112T15N R2W Sec. 25 Lot 112 #051-283-19 MUNICIPALITY OF ANCHORAGE Community Development Department ~//.~ Phone: 907-343-7904 Development Services Division ~ Fax: 907-343-7997 On-Site Water & Wastewater Program Mayor Dan SulEvat~ ON-SITE SEWER/VVELL PERMIT APPLICATION FOR A SINGLE FAMILY DWELLING Parcel I.D. 05t-283-19 Property owner(s): Troy Davis Homes, Inc. Day phone: 357-9394 Mailing address: t66 E. Parks Highway, Wasilla, AK 99654 Site address: 17765 Almdale Avenue Eagle River, A.~ Legal description (Sub'd., Block & Lot): B.,J, JYrLot 112, Sect[on 25, TtSN, R2W Legal description (Township, Range & Section) Lot Size: 108,900 Acres Number of Bedrooms: Four (4) THIS APPLICATION IS FOR: (~;~ all that apply) Absorption Field X Septic Tank X Holding Tank [] Privy [] Private Well X Water Storage [] THIS APPLICATION IS AN: Initial X Upgrade [] Renewal [] THIS APPLICATION INCLUDES A VARIANCE / WAIVER REQUEST FOR: I certify that the above information is correct. I further certify that this application is being made for a Single Family Dwelling and is in accordance with applicable Municipal Codes. (Signature of property owner or authorized agent) Permit/Rush Fees: Date of Payment: Receipt Number: Permit No. *¢ 171/ Waiver Fees: Date of Payment: Receipt Number: Waiver No. C:~,Users~And Eng\Desktop\Mike\T15N Lot 112\Permit Application Lot 112.d ocC:\Users~AndEng\Desktop~Mike\Tl5N Lo[ 112\Permit Application Lot 112.doc ANDERSON ENGINEERING P,O, BOX 240773 ANCHO~GEi AK 99524 7766 (F~) 522-7773 677~ August 21, 2012 Municipality of Anchorage Development Services Department On-Site Water and Wastewater Program 4700 South Bragaw Street Anchorage, AK 99519-6650 Subject: Lot 112, T15N, R2W, Section 25 Septic System Design and Permit Application Impacts to Adjacent Properties Dear Onsite Services Engineer: The owner of Lot 112, T15N, R2W, Section 25 intends to construct a four bedroom home on the lot. We are therefore requesting a permit be issued for the construction of a new well and septic system to accommodate the home. The attached Site Plan and backup documentation identify the location and configuration of the proposed well and septic system along with the alternate site. No existing wells are closer than 100' from the proposed septic system. Drainage arrows are shown on the site plan showing the grade and direction of flow on the lot. The drainage pattern will not be changed as a result of this project. The new septic system will be placed more than 25' outside the area identified as Class D Wetlands. No final determination has been made regarding the presence of wetlands on this lot, but is currently ongoing. The test holes placed on the lot in the area of the absorption trenches indicated gravel with sand and silt (GM). The percolation rate of the soil was determined to be 1.2 to 13.3 minutes per inch. Groundwater was found during the placement of the test holes at depths of 8' and 10' and stabilized at these levels during the monitoring period. An application rate of .8 gallons per day per square foot was used in the design of the absorption system and the trenches will be centered around Test Hole No. 2. We are proposing to place a new 1,500-gallon STEP tank and a total of 106' long by 5' wide by 2' effective depth absorption trenches to treat and dispose of the effluent generated in the house. The elevation of the distribution line in the absorption trenches will be 1' below the surface and the total depth will be 3'. A minimum of 3' of fill or 2" of insulation and 2' of fill will be placed over the absorption trenches and 4' over the STEP tank. The ground surface on the Jot in the area of the absorption trenches slopes to the south Lot 112, T15N, R2W, Section 25 August 2'1, 2012 Page Tw~ and wes~at a~appro~imating 2%. The new trenches will be constructed parallel with th~slop~'s"~'d'ch a~' possible in conformance wit,h, Municipal requirements. The new sep~[l~.~~constructed a minimum of 100 from all wells and any surface water and 10' r~m the proposed and existing water services in the area. If the system is constructed in accordance with our design the following statements apply: ]. The system, if constructed as designed, will have no adverse impact on the wells in the area or those to be constructed in the future. 2. The system, if constructed as designed, will have no adverse impact on existing septic systems in the area or those to be constructed in the future. 3. The system, if constructed as designed, will have no adverse impact on reserve space, either surface or subsurface, on any lots located in the area. 4. The system, if constructed as designed, will have no adverse impact on drainage patterns in the area. The current drainage pattern will be maintained. Sincerely, Michael E. Anderson, P.E. Attachments 93 N89'49'lO"W 328.91 11 APPROXIMATE CLASS D WETLAND BOUNDARY ~ NOTE: No Separation Distance Conflicts Between the Well and Septic System on This Lot and ]hose on Adjacent Lots. NOTE'. Well Radius and Easement Une to be Staked by a Registered Land Surveyor Prior to Construction. 3 DPD/SF ApplicaUon Rate. / / 1,500 Gallon LEGEND MT - Monitor Tube FCO - Foundation Cleon Out TH - Test Hole CO - Clean Out MH - Man Hole \ \ \ \ / / / / / 8 S89'49'50"E 528.91 ALMDALE AVENUE NOTE: No Areas of Excessive Slope or Surface Water are WibS[n 100' of Any Par[ of the New Septic System. SITE PLAN i"~ ::: 49~:h MICHAEL E, ANDERSBN No, CE-438! SCALE 1' = 50' BLM LOT 198A, SECTION 18, T15N, R1W DESIGN FACTORS: SYSTEM REQUIREMENTS: Four Bedroom Home 5' Wide Trench System Perc, Rate: 13.3 Min./Inch 1,500 Gallon STEP Tank Application Rate: .8 GPD/SF 2' Drainfield Rock 4 Bedrooms X 150 GPD/.8 GPD/SF (Application Rate) = 750 SF Absorption Area 750 SF/5 SF/LF*.70 (Red. Factor) = 105 LF Trench Length THEREFORE: Construct a 2-53' Long x 5' Wide x 2' Effective Depth Aborption Trenches at the Location Shown. Flow Line Elevation in Trenches to be 1' Below Original Ground Surface. Total Depth to be 3' Below Existing Ground. Provide 3' of Cover Over Trenches and 4' Over Tank or Provide 2" of Insulation and 2' of Cover. Maintain 10' Separation From Water Services in the Area. Natural Backfill Topsoil and Seed -- Geotextile Fabric 4" Perforated -- PVC (Holes Down) -- Drainfield Rock 5~ TYPICAL DEEP TRENCH SECTION -- NOTE' Grade Area Over Trench to Dra'n Away ' . . , . Mlmmum 6 Separation From Bedrock. Minimum 4' Separation From Groundwater. Minimum 100' Separation From Private Wells in the Area. Mimmum. . 100, Separation. From Surface Water or Streams.. · Mlmmum 10 Separation From Water Service L~ne. ~700 MUNICIPALITY OF ANCHORAGE DEVELOPMENT SERVICES DEPARTMENT BRAGAW STREET ANCHORAGE, AK g951c)-6650 LEGAL DESCRIPTION: PERFORMED FOR: DATE: 7/50/12 PARCEL ID#: DEPTH (feet) OB/OG 1 2 3 4 5 SILTY SAND WITH GRAVEL 6 SM ? 8 9 SOILS LOG - PERCOLATION TEST BLh'I LOT 112, TISN, R2W, SECTION 25 1i TROY DAVIS HOMES. INC. PROJECT No.: TECHNICIAN: TEST HOLE 1 ] WAS GROUND WATER ENCOUNTERED? __ IF YES ~ WHAT DEPTHV DEPTH OF WATER AFTER MONITORING: 20¸ B0H @ 15' JKB SLOPE YES DATE OF MONITORING: 8/8/2012 ~ SITE PLAN SEE SITE PLAN DEPTH TO DATE READING GROSS TIME NET TIME WATER NET DROP (I'"IINUTES) (~'IINUTES) (INCHES) (INCHES) TEST HOLE PRESOAKED PRIOR TO TESTING: 8/3 1 1:12 3.00" 2 1:42 30 5.25" 2.25" 3 1:43 2.88" 4 2:13 30 5.13" 2.25" 5 2:14 2.50" 6 2:44 30 4.75" 2.25" PERCOLATIONSt&TE: 13.3 .C~rNnNCH) PERC. HOLE DIA. 6" (iNCHES) TEST RUN BETWEEN: 5.0 FT. and 6.0 FT. COMMENTS: TEST HOLE PRE SOAKED PRIOR TO TEST. TEST PERFORMED BY ANDERSON ENGINEERING. I, MICHAEL E. ANDERSON CERTIFY THAT THIS WAS PERFORMED IN ACCORDANCE WITH ALL STATE AND MUNICIPLE GUIDELINES IN EFFECT ON THIS DATE:. 8/8/12 A700 DEPTH (fe~t) 1 2 3 4 5 6 g 9 11 20¸ MUNICIPALITY OF ANCHORAGE DEVELOPMENT SERVICES DEPARTMENT BRAGAW STREET ANCHORAGE, AK 99519-6650 SOILS LOG - PERCOLATION TEST LEGAL DESCRIPTION: BLP1 LOT 112, TISN, R2W, SECTION 25 PERFORMED FOR: DATE: 7/30/12 PARCEL ID#: d K B OB/OG SILTY SAND WITH GRAVEL SH BOH @ I1' TROY DAVIS HOMES. INC. PROJECT No.: TECHNICIAN: TEST HOLE 2 ] WAS GROUND WATER ENCOUNTERED? __ IF YES ~ WHAT DEPTH? 8' DEPTH OF WATER AFTER MON]TOPdNG: 8' DATE OF MONITORING: 8/8/2012 SLOPE YES SITE PLAN SEE SITE PLAN DEPTH TO DATE READING GROSS TIME NET TIME WATER NET DROP (MINUTES) (MINUTES) (INCHES) (INCHES) TEST HOLE PRESOAKED PRIOR TO TESTING: 8/3 I 1:17/1:27 10 1.25"/9.75" 8.50" 2 1:28/1:38 10 1.5o"/]o.oo'8.50" 3 1:39/1:49 l0 1.25"/9.75" 8.50" 4 1:50/2:00 10 1.oo"/9.5o" 8.50" 5 2:01/2:11 10 l.SO"/lo.oo' 8.50" 6 2:12/2:22 10 1.oo"/9.5o" 8.50" PERCOLATION RATE:I.2 (MIN/INCH) PERC. HOLEDIA. 6" ~INCHES) TEST RUN BETWEEN: 3.0 FT. and 4.0 FT. COMlvlENTS: TEST HOLE PRE SOAKED PRIOR TO TEST. TEST PERFORMED BY ANDERSON ENGINEERING. I, MICHAEL E. ANDERSON CERTIFY THAT THIS WAS PERFORMED IN ACCORDANCE WITH ALL STATE AND MUNICIPLE GUIDELINES IN EFFECT ON THIS DATE 8/8/12