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Home My WebLink AboutWILLIAMSON #3 BLK 2 LT 35Williamson Block 2 Lot 35 #015-074-31 MUNICIPALITY OF ANCHORAGE Community Development Department Development Services Division On-Site Water & Wastewater Program ~ Phone:907-343-7904 Fax:907-343-7997 ON-SITE SEWER/WELL PERMIT APPLICATION Parcel I.D. 015-074-31 Property owner(s) Shaun Kimberley and James Lane Mailing address 5130 E. 98th Avenue Anchorage, AK 99507 Day phone Site address East 98th Avenue Anchorage, AK 99507 Legal description (Sub'd., Block & Lot) Williamson #3, Block 2, Lot 35 Legal description (Township, Range & Section) Lot Size 40,875 Sq. Ft. Number of Bedrooms Five (5) APPLICATION IS FOR: (~;~ all that apply) Absorption Field [] Septic Tank [] Holding Tank [] Privy [] Private Well [] Water Storage [] APPLICATION IS AN: Initial [] Upgrade [] Renewal [] TYPE OF DWELLING: Single Family (SF) [] (w/wo ADU) Duplex (D) [] Multiple Dwellings [] (SF and/or D) THIS APPLICATION INCLUDES A VARIANCE / WAIVER REQUEST FOR.' Distance: I certify that the above information is correct. I further certify that this is in accordance with applicable Municipal Codes. (Signature of property owner or authorized agent) Permit/Rush Fees: Date of Payment: Receipt Number: Permit No. Cr ¢t t Waiver Fees: Date of Payment: Receipt Number: Waiver No. April 2, 2013 Municipality of Anchorage Development Services Department On-Site Water and Wastewater Program 4700 South Bragaw Street Anchorage, AK 99519-6650 ,Subject: Lot 35, Block 2, Williamson Subdivision No. 3 Septic System Design and Permit Application Impacts to Adjacent Properties Dear Onsite Services Engineer: The owner of Lot 35, Block 2, Williamson Subdivision No. 3 intends to construct a new five-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. Aisc identified on the plans are the existing wells in the area and septic systems on surrounding lots. No conflicts exist between the proposed septic system and well or septic systems and wells on adjacent lots. 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 test hole placed on the lot in the area of the absorption trenches and alternate site indicate silty sand with gravel (SM/GM). The percolation rate of the soil was determined to be 6.15 minutes per inch. No groundwater was found during the placement of the test hole and none was noted during the monitoring period. An application rate of .8 gallons per day per square foot was used in the design of the absorption system. We are proposing to place a new 1,500-gallon septic tank and 2- 40' long by 3' wide by 6' effective depth absorption trenches to treat and dispose of the effluent generated in the house. The elevation of the distribution line in the absorption trench will be 2' below the surface and the total depth will be 8'. A flow splitter valve will be placed to insure even flow to each trench. A minimum of 3' of fill or 2" of insulation and 2' of fill will be placed over the absorption trench and 4' over the septic tank. The ground surface on the lot in the area of the septic system slopes to the northwest Lot 35, Block 2, Williamson No. 3 April 2, 2013 Page Two at grades between 15% and 20%. The new trenches will be constructed parallel with the contours of the slope as much as possible in conformance with Municipal requirements. The new septic system will be constructed a minimum of 100' from all wells and any surface water and 10' 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. 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. 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. 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 d O0 J _J %. I / / / / n / LOT 35, BLOCK 2, WlLLIAMSON SUBDIVISION NO. 3 DESIGN FACTORS: SYSTEM REQUIREMENTS: Five Bedroom Home Deep Trench System Perc. Rate: 6-15 Min./Inch 1,500 Gallon Septic Tank Application Rate: .8 GPD/SF 6' Drainfield Rock 5 Bedrooms X 150 GPD/.8 GPD/SF (Application Rate) = 937.5 SF Absorption Area 937.5 SF/12 SF/LF = 78.13 LF Trench Length THEREFORE: Construct 2-40' Long x 3' Wide x 6' Effective Depth Absorption Trenches at the Location Shown. Flow Line Elevation in Trenches to be 2' Below Odginal Ground Surface. Total Depth to be 8' Below Existing Ground. Provide 4' Cover Over Septic Tank and 3' Cover Over Absorption Trench. Place Flow Splitter Valve to Insure Even Flow to Each Trench. Natural Backfill Geotextile Fabric 4" Perforated PVC (Holes Down) Drainfield Rock TYPICAL DEEP TRENCH SECTION (NO SCALE) ~..;. ~.'~ .......... NOTE: Grade Area Over Trench to Drain Away. :.~ M n mum ' ' - .-" 49th 6 Separation From Bedrock. m......~.. .......................... ,.~.~.....~ Minimum 4' Separation From Groundwater. t ~ Minimum 200' Separat on From Class A Well in the Area A'~"~'"~'~'~i'~;;~';~'~'~""'.'-"'~.'~ Minimum 100 Separat on From Surface Water or Streams~ ~?.~,~ No 3- 5, ? 8, g, I3- 15. $7-