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HomeMy WebLinkAboutSKYHILLS PH 3 BLK 3 LT 225kyhills Ph 3 Block 3 Lot 22 #011-122-54 MUNICIPALITY OF ANCHORAGE Community Development Department Development Services Division On-Site Water & Wastewater Program R U£,' ;'! ON-SITE SEWEPJWELL PERMIT APPLICATION Phone: 907-343-7904 ~ Fax: 907-343,7997 Mailing address P.O. Box 100384 Anchorage, AK 99510 Day phone Site address 7943 Skyhil]s Drive Anchorage, AK Legal description (Sub'd., Block & Lot) Skyhills PH3, Block 3, Lot 22 Legal description (Township, Range & Section) Lot Size 40,525 .S q. Ft. Number of Bedrooms ~) APPLICATION IS FOR: ([~] all that apply) Absorption Field [] Septic Tank [] Holding Tank [] Privy [] Private Well [] Water Storage [] APPLICATION IS AN: TYPE OF DWELLING: Initial [] Single Family (SF) (w/wo ADU) Upgrade [] Duplex (D) Renewal [] Multiple Dwellings (SF and/or D) THIS APPLICATION INCLUDES A VARIANCE / WAIVER REQUEST FOR: Dis tance: 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: ~ ~-- ~\~'-~.,~'~aiver Fees: Date of Payment: ~'1 ~ ~ I ~ ~ Date of Payment: Receipt Number: OL~(~ & ~ Receipt Number: Permit No. 05¢ ~ ~ t ~ ~t Waiver No. Permit App_9-1-12.doc ANDERSON ENGINEERING P.O~ BOX 240773 ANCHORAGE, AK 99524 522-7773 677-7766 (FAX) August 3, 2013 Municipality of Anchorage Development Services Department On-Site Water and Wastewater Program 4700 South Bragaw Street Anchorage, AK 99519-6650 Subject: Lot 22, Block 3, Skyhills Subdivision No 3 Septic System Design and Permit Application Impacts to Adjacent Properties Dear Onsite Services Engineer: The owner of Lot 22, Block 3, Skyhills 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 septic system to accommodate the home. The subdivision is served by the AWWU water system. The attached Site Plan and backup documentation identify the location and configuration of the proposed septic system along with the alternate site. Existing septic systems in the area are also shown on the attached plans. 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 holes placed on the lot in the area of the absorption trench and alternate site indicated sand and silt with some gravel (SPIGPIGM) material. The percolation rate of the soil was determined to be 1 to 5 minutes per inch. No groundwater was found during the placement of the test holes and none was noted during the monitoring period. An application rate of 1.2 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 a 40' long by 3' wide by 8' effective depth absorption trench to treat and dispose of the effluent generated in the house. The elevation of the distribution line in the absorption trench will be 2.0' below the surface and the total depth will be 10.0'. 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 absorption trench slopes to the west at 25% but flattens out west of the trench location. The new trench will be constructed parallel with the slope as much as possible in conformance with Municipal requirements. The new septic system will be constructed a minimum of 100' from all Lot 22, Block 3, Skyhills No. 3 August 3, 2013 Page Two wells and any surface water and 10' from the proposed and existing water services in the area. If the apply: system is constructed in accordance with our design the following statements ]. 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 ./ PLAT NO. 99-140 SKYHILLS SUBD., PHASE LOT 22, BLOCK 3 40,525 S.F. 5 SITE PLAN SCALE 1' = 40' TH - Test Hole CO - Clean Out MT - Monitor Tube 2C0 - Double Clean Out FCO - Foundation Clean Out LOT 22, BLOCK 3, SKYHILLS SUBDIVISION NO.3 DESIGN FACTORS: SYSTEM REQUIREMENTS: Five Bedroom Home Deep Trench System Perc. Rate:l to 5 Min./Inch 1,500 Gallon Septic Tank Application Rate: 1.2 GPD/SF 8' Drainfield Rock 5 Bedrooms X 150 GPD/1.2 GPD/SF (Application Rate) = 625 SF Absorption Area 625 SF/16 SF/LF= 39.06 LF Trench Length THEREFORE: Construct an Absorption Trench 40' Long x 3' Wide x 8' Effective Depth. Flow Line Elevation in Trench to be 2' Below Original Ground Surface. Total Depth to be 10' Below Existing Ground. Place Minimum 3' of Cover Over Absorption Trench and 4' Cover Over Septic Tank. Natural Backfill ..© Geotextile -- Fabric 4" Perforated PVC (Holes Down) Drainfield Rock NOTE: TYPICAL DEEP TRENCH SECTION Minimum 6' Separation From Bedrock. (NO SCALE) Grade Area Over Trench to Drain Away. Minimum 4' Separation From Groundwater. Minimum 100' Separation From Wells in the Area. Minimum 100' Separation From Surface Water or Streams. 4700 DEPTH 1 7-- MUNICIPALITY OF ANCHORAGE DEVELOPMENT SERVICES DEPARTMENT BRAGAW STREET ANCHORAGE, AK 9951g-6650 SOILS LOG - PERCOLATION TEST LEGAL DESCRIPTION: Lot 22, Block 3, Shyhills Ph. 3 PERFORMED FOR: Colony Builders DATE: 7/30/13 PROJECT No.: PARCEL ID#: TECHNICIAN: JB 0B/0G 20 B.O.H. I TESTHOLE 1 [ SLOPE ~' No WAS GROUND WATER ENCOUNTERED? __ IF YES ~ WHAT DEPTH?.__ DEPTH OF WATER AFTER MONITORING: None GATE OF MONITORING: 8/6/13 Prof~sional Engineers Stamp: SITE PLAN See Site Plan DEPTH TO DATE READING GROSS TIME NET TINE WATER NET DROP (MINUTES) (MINUTES) (INCHES) (INCHES) 7/30/1! TEST HOLE PRESOAKED PRIOR TO TESTING: 1 4:50/5:00 10 2.50"/5.00" 2.50" 2 5:01/5:11 10 2.25"/4.75" 2.50" 3 5:12/5:21 l0 2.50"/4.875" 2.375" 4 5:22/5:32 10 2.25"/4.625" 2.375" 5 5:33/5:43 l0 2.375"/4.75" 2.375" 6 5:53/6:03 10 2.25"/4.625" 2.375" PERCOLATION RATE: 4.2 .(MIN/INCH) PERC. HOLE DIA. 6 _(INCHES TEST RUN BETWEEN: 4 FT. and 5 FT. COMMENTS: TEST HOLE PRE SOAKED PRIOR TO TEST. TEST PERFORMED BY ANDERSON ENGINEERING. 1, MICHAEL E. ANDERSON CERTIFY THAT THIS WAS PERFORMED IN ACCORDANCE WITH ALL STATE AND MUNICIPLE GUIDELINES IN EFFECT ON THIS DATE: 8/5/13 4700 MUNICIPALITY OF ANCHORAGE DEVELOPMENT SERVICES DEPARTMENT BRAGAW STREET ANCHORAGE, AK 99519-0650 SOILS LOG - PERCOLATION TEST LEGAL DESCRIPTION: Lot 22, Block 3, Shyhills Ph. 3 PERFORMED FOR: Colony Builders DATE: 7/30/13 PROJECT No.: PARCEL ID#: TECHNICIAN: JB DEPTH (feet) OB/OG ! 4 5 6 8 9 20 B.O.H. WAS GROUND WATER ENCOUNTERED? __ IF YES ~ WHAT DEPTHS__ DEPTH OF WATER AFTER MONITORING: DATE OF MONITORING: SLOPE No None 8/5/13 Professional E~ineers Stamp: SITE PLAN See Site Plan DEPTH TO DATE READING GROSS TIHE NET TIME WATER NET DROP (MINUTES) (MINUTES) (INCHES) (INCHES) 7/30/1~ TEST HOLE PRESOAKED PRIOR TO TESTING: 1 4:43/4:53 l0 9.00,vn.5o,, 2.5" 2 4:54/5:04 10 9.25,711.625,, 2.375" 3 5:05/5:15 10 ,9.25"/11.625" 2.375" 4 5:16/5:26 10 9.00"/11.25- 2.25" 5 5:27/5:37 10 9.00'?I 1.25" 2.25" 6 5:38/5:48 10 9.25"/11.50" 2.25" PERCOLATION RATE: 4.4 (MIN/INCH) PERC. HOLE DIA. 6 (INCHES) TEST RUN BETWEEN: 4 FT. and 5 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: 8/5/13 II BI II il II II II II II II II II II II Il il Performed For: Bob Klein Legal Description: Lot.23. Block 3. Sky Hills· Phase III 9 10 12 13 14 15 16 17 18 19 OGIPT Municipality of Ancho~ge Depadment of Health & Human Se~ices 825 L Street, Anchorage, AK 99502-0650 SOILS LOG - PERCO~TION TEST Fine Sand Some Silt SP Was Groundwater Encountered? No If Yet, What Depth? ' Depth to Water After Monitodng None Date: 10/10/'99 Bottom of Hole SLOPE SITE PLAN S L O P E 10%+ 2% Reading Date Gross Net Depth To Net Time Time Water Drop 1 25-Sep 9:10 .75" 2 9:20 I0 5.75" 5" 3 9:21 .625" 4 9:31 10 5.625" 5" 5 9:32 .75" 6 9:42 10 5.75" 5" Perc. Rate: 2 Min./Inch Perc. Hole Diameter: 6" Test Run Between 6 Ft. and 7 Ft. Comments: Percolation Cavity Presoaked Prior to Testing. Performed By: Ed Sanderson. I, ' r Certify That This Test Was Performed In Accordance With All State and Municipal Guidelines In Effect On This Date: 10/20199 · Mumc~pai,ty OT Ancnorage Depa~ment of Health & Human ~e~lces AK SOILS LOG - PERCO~TION TEST Pedormed For: Dob Klein Date Legal Description: Lot 22. ~look 3. Sky Hills. Phase OGIPT Fine Sand Some Silt 15 16 17 ;LOPE SITE PLAN SP Was GroundWater Encountered? · No If Yet, What Depth? Depth to Water After Monitoring None Date: 10/10/99 2% Reading Date Gross Net Depth TO Net Time Time Water Drop I 24-Sep 13:10 .625" 2 13:20 10 5.625" 5" 3 13:21 .625" 4 13:31 10 5.625" 5" 5. 13:32 .75" 6 :13:42 10 5.75" 5" Bottom of Hole Perc. Rate: 2 Min./inch Perc. Hole Diameter: 6" Test Run Between 7 Ft. and 8 Ft. Comments: Percolation Cavity Presoaked Prior to Testihg. Performed By: Ed Sanderson.· I, ' . Certify That This Test Was Performed In Accordance With All State and Municipal Guidelines In Effect On This Date: 10120199