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HomeMy WebLinkAboutSKYHILLS PH 3 BLK 2 LT 55kyhills Block Lot 5 #011 - 122-47 '" Municipality ofAnchomge Page ! of 3 Department of Health and Human Services Division of Environmental Se~tces On-Site Se~tces Section 825 'L' Street Room 502 P.O. Box 196650 Anchorage. AK 99519-6650 ~ww.cLanchorage.ak.us (907) 343-4744 ON-SITE WASTEWATER DISPOSAL SYSTEM AND/OR WELL INSPECTION REPORT Permit Number: SW000266 PID Number:. 021-122-47 Name: Wesley Nakamoto WastewaterSystem: New P.O. Box 222041 Anch. AK 99522 ABSORPTION FIELD Four (4) Deep Trench LEGAL DESCRIPTION 1.2 c. oo~ 10 n. r2-'-'~ 5 * Skyhills No. 3 3 .. 7 2 F,. 37 Well: City Water 3 n. I N/A 'n. n. 518 Fe ASTM D3034 PVC n. Spinell Homes 8/17-22/00 "~: c,~ In'~s~"':.. ic.~, .~--o,,~,:F, TANK SEPARATION DISTANCES ~ septic n Holding D S.T.E.P. I-I O~he~:. Tank Field Station Tank Se,,~U~ Anchorage Tank 1,250 w,, >200' >200' N/A N/A >25' Steel Two (2) s~,.w..>100' >200' N/A N/A ~ j - LIFT STATION - NONE ON LOT Mu. >5' >10' N/A N/A F~,~. >5' >10' N/A N/A -n~,.~- ~...,:.,~,,~ ~,~,.,. c,~,~o,,~ None ~loted ~"P~'~'~ """"~: 'BENCH MARK Garage Slab 100.0 Engineer's Stamp Inspections performed by: Mike Anderson Dates: 1" 8/17/00 ~':',. 4S-LU l"~,., '.~.~ 2~ 8/18/00 Department of Health and Human Services approval . ... ~ Municip~lit~ of Ancl~°['age DEVELOPMENT SERVICES DEPARTMENT 4700 South Bragaw Street Anchorage, AK 99519-6650 - 343-7904 On-Site Wastewater Disposal System or Well Inspection Report Permit Number SW000266 PID No. 011-122-47 EV£NSON COURT· S 89'54'50" W 159.O3' Pag6 2 of 3 LOT 4 A B S1 40.0 71.0 S2 49.0 78.0 M1 77.2 106.8 C4 76.8 106.7 ; C5 58.9 76.5 LOT 5 Four Bedroom Home '. CaAV~a. DRIVE bJ LOT 6 : Municipality of Anchorage DEVELOPMENT SERVICES DEPARTMENT 4700 South Bragaw Street Anchorage, AK 99519-6650 - 343-7904 On-Site Wastewater Disposal System or Well Inspection Report Permit Number SW000266 PID No. 011.122-47 Page3 of 3 ~ 95.6 ~ Ou I U A~, ~so __ 91.1 /ISePt.~c Ta~l~ 89,. 9 ~OteXtile Fabric.. ~ Drainfteld Rock 79.7 91.7 ~ /-- " 37' I 86.7 MUNICIPALITY OF ANCHORA GE Department of Health and Human Services On-Site Services Program 825 L Street, Room 502 P.O. Box 196650, Anchorage, AK 99519-6650 (907) 343-4744 ON-SITE WASTEWATER DISPOSAL SYSTEM PERMIT Initial Date Issued: Jul 28, 2000 Expiration Date: Jul 28, 2001 Permit Number: SW000266 Legal Description: SKYHILLS PH 3 BLK 2 LT 5 Design Engineer: 0014 Anderson Engineering Owner Name: Wesley Nakamoto Owner Address: PO Box 222041 Anchorage, AK 99522- Parcel ID: 011-122-47 Site Address: 007976 SKYHILLS DR Lot Size: 42401 SQ. FT. Total Bedrooms: 4 Permit Bedrooms: 4 This permit is for the construction of; [] Disposal Field [] SepticTank [] Holding Tank [] Privy [] Private Well [] Water Storage Ail 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 DHHS at least 2 hours prior to each inspection. Provide notification by calling (907) 043-4744 ( 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. Issued By:~-4~. ~ Date: ANDERSON-ENGINEERING' · ~' P.O. BOX240773' '. . . ',' ANCHORAGE, AK 99524 ~ 522-7773 · 522-6779 (FAX) · ! July 10, 2000 Municipality of Anchora'ge Department of Health and Human Services 825 "L" Street Anchorage, AK 99502-0650 Subject: Lot 5, Block 2, Skyhills Subdivision Phase III Septic System Design and Permit Application Impacts to Adjacent Properties · Dear Onsite Services Engineer: The owner of Lot 5, Block 2, Skyhills Subdivision Phase III intends to construct a four- bedroom home on the lot. We are therefore applying for a permit to construct a new septic system on the lot to serve the new house. The attached Site Plan and backup documentation identify the location and configuration of the new septic system and the parameters used in the design.. The lot is served by the Municipal water system and the system will be constructed a minimum of 10'~ from the water service line. The test holes placed on the lot in October of last year at the locations shown revealed poorly graded sand with some silt with a percolation rate'of 2 minutes per inch. No groundwater was encountered in either test hole and none was found-during the ensuing water-monitoring period. We are therefore proposing to construct a deep. trench system with a maximum depth of 10' below the original ground surface. The length of the trench will be 36' with an effective depth of 7' The ground surface on the lot slopes from north to south at varying grades sometimes as steep as 20%. The new trench will be constructed parallel to the contours in conformance with Municipal requirements. Some grading will be required to 'flatten slopes in the area during construction of the home site and the driveway. Grading will 'also be accomplished once the system is completed so drainage is away'from the trench and septic tank but in the direction of the current drainage pattern.. No surface water will accumulate in the trench 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 subdivision is currently served by the Municipal water system. The.system, if constructed as designed, will have no adverse ir~pact on existing sepbc systems in the area or those to be constructed in the future. . Eot 5, Block 2, Skyhills Phase III 'July 10, 2000 Page Two The system, if constructed as designed, will have no adverse impact on reserve space, either surfac? Or subsurface, on any lots located in the area. The system, if constructed as designed, will have no adverse impact on dra!nage patterns in the area. The currentdrainage )attem will be maintained. -4. Sincerely, Michael E. Anderson, P.E. Attachments ':1 THIS PROJECT' ~9.o~'- .... .. ,~,., 8 I.. '1, ' ., ' ~" S~ILL~ . ~o.~2~ ~.~' ' 45.m~ ~ · ' W ~ · f' :I ' - X ' .. I" · 2o z ~s= ~ 23 ' ' I0 - · .~ . -~- - ~ . · .... ,..~ ~ ~.,~ · ' .'.m . ,. · ~" 25-. ' I' .--.: ''".ao · · '" .... , ..,.. ~. . - ,o.~, ~,~ · ~' '26 ~ - .. - .: ~ .- .~ 20 . · . ' ~ ~o.,, ~ ' -' -'. g~ ~" '... .. ... .~ - . . . .~_~. -..~ 4 J EVENSON COURT S89"54'50'W 159.05 42,4 q.ft. / Four Bedtoon~ House 6 Sept: '' " ;3 Long X X 7 Eff. Site. ~ate ' .~?' '.. SITE PLAN · SCALE 1" = 40' LOT 5, BLOCK 2, SKYHILLS PHASE III DESIGN FACTORS: SYSTEM REQUIREMENTS: Four Bedroom Home Perc. Rate: 2 Min./Inch Application Rate: 1.2 GPDISF Deep Trench System 1,250 Gallon Septic Tank 7' Drainfield Rock 4 Bedrooms X 150 GPD 11.2 GPDISF '= 500 SF of Absorption Area 500 SFI14 SF/LF = 35.7 LF Trench Length Therefore: Construct a New Absorption Trench 36' in Length With 7' of Drainfleld Rock Beneath the Distribution Lateral. Distribution Lateral to Be Placed 3' Below Existing Ground. Total Depth of Trench to Be 10' from Existing Surface. Mound Over Trench to Provided Minimum Cover of 3'. Maintain 10' Separation From Water Service Line. 216II '7 ' 0". · Nat~al Backfill J Geotextile · Fabric Perfo~ate~ PVC (Slots ield Rock NOTE: TYPICAL WIDE TRENCH SECTION _"~"'~ ~F'~, '~'~-' Grade Area Over Trench ,o Drain Away. ~--,~ '~", Minimum 6' Sepamtion From Bedrock. "~' ~~. ,n :%%% Minimum 10' S epa ration From Lot Line. ~~~ ~inimum 4' 8opamtlon From Groundwater. ~inimum ~0' Separation ~rom ~ater 8e~ice Line. Municipality of Anci~orage Department of Health & Human Services 825 L Street, AnchOrage, AK 99502-0650 SOILS LOG - PERCOLATION TEST' Performed For: Bob Klein Legal Description: Let 5 Block ~ Slcv ~lills. Phase Ill SLOPE I OG~T 2 · TESTtiOLE NO. 5-2-A Fine Sand Some Silt 12 .13 14 15 Was Groundwater Encountered'~ No If Yet, What D&pth? · Depth to Water After Monitoring None Date: 10/11/99 i6 17 18 Bottom of Hole R~.ading Date ~ Gross Net Depth To Net . Time Time .: Water Drop I .4-Oct. 10:20 1.25" .I · . 2 10:30 10' ~ 6.25" 5' · 3 10:31 1.25" 4 10:41 10 6.25' 5' 5 10:42 1.25". 6 10:52 · 10 6.25" Perc. Rate: 2 MinJInch Perc. Hole Diameter. .6" ' Test Run Between 6 Ft. and 7 FL Comments: Percolalion Cavity.Presoaked Prior to Testing. Performed By: Ed Sandemqn, I, ~ · Certify That This'Test Was Performed In Accordance With Ail State and Municipal Guidelines In Effect On Thls. Dale: 10/'20/99 SOILS LOG - PERCOLATION TEST Performed For:. Bob Klein Date L~I ~cription: Lot 5_ Bh:x~k 2. Sky Hills_ Phase II1 -.,~\,~,,~.~.,~'"~ SLOPE ' SITE PLAN ~:.,.., o ' OG, T 7' · " ' i ... omes,,t ///!I · -' .F, Y/,;/,," (. ,~a,. .. sP ' . l//*._.~'. ..'~-! Was Groundwater 9 Encountered? No . . If Yet, What Depth? 10 Depth t? Water ' .. After Monitoring None 11 Date: 10111/99 ." .. . Reading Date Gross Net. · Depth To. Net Time Time Water Drop I · ! 4-Oct '13:10 · ,75T 2 · I 13:20 10 5.75' - 5' 3 .' '1 13:21 - 1,25' *' · 4 13:31 10 * 6.25" 5" 5 '. 13:32 . 1' · 6 . 13:42 10 6" 5' · 6 18 Bottom of HSle · · Perc. Raie: 2 Min./Inch ' ' .'Perc.'Hole Diamete;:: 6", : ' Test Run Between 7 Ft. and 8 Ft. ,. Comments: Percolation Cavity Presoaked Prior lo Testing. :. - Performed By:. ~ . I, ~ Ce~Jfy That This Test Was ~erf~me~' In Accordance With Ail State and Municipal Gdidelines In El'fect On This Date: 10/20/99 ON-SITE WASTEWATER DISPOSAL SYSTEM CONSTRUCTION AND MATERIAL SPECIFICATIONS SUBJECT: LOT 5, BLOCK 2, SKYHILLS, PHASE III GENERAL: The scope of this project includes the procurement and placement of a new 1,250 gallon septic tank at the location shown on the Site Plan. It also includes the construction of a new 36' long X 3' wide X 7' effective depth absorption trench. Distribution pipe will be placed at 3.0' below the odginal greund surface. The total depth of the trench from original ground will be 10.0'. All components of the system must be a minimum of 10' from the water line serving the new house on the lot. Construction shall be in accordance with the appreved site plan, design drawings, Municipal Permit with any special previsions or conditions, and all applicable State and Municipal Wastewater Disposal Regulations. The Contractor shall be responsible for obtaining all underground utility locates and for the layout of the septic system and verification of the location of all lot lines. Unless specifically agreed otherwise, the contractor shall be responsible for final grading areas subsequently depressed from soil settling. Preperty owner shall be responsible for revegetation of affected areas unless specifically agreed otherwise. Contractors installing wastewater disposal systems must be certified by the Municipal Department of Health and Human Services for system installations. Owners installing their own systems must receive prior approval from D.H.H.S. before beginning system installation. SEPTIC TANK INSTALLATION 1. The new 1,250 gallon septic tank must be procured from an approved source and installed at the location shown on the plans. A septic tank is to be constructed by a certified septic tank manufacturer. Construction shall include two 4" cleanouts for pumping access. 3. The septic tank shall be sufficiently bedded to prevent settling or shifting of the tank. 4. All standpipes on the septic tank shall extend a minimum of 12 inches above final grade. 5. Tanks installed without 4' of cover shall have a minimum of 2" of direct burial insulation. A foundation cleanout shall be installed one to four feet from the building foundation. Two cleanouts are required between the tank and the drainfield. · Lot 5, Block 2, Skyhills Phase III July 10, 2000 Page 2 of 3 7. Final grading over the tank shall be such that a positive slope exists away from the septic tank. DRAINFIELD CONSTRUCTION: 1. The drainfield shall be constructed to the dimensions shown on the design. The bottom of the trench shall be within 2" of level. Distribution piping must be placed level with perforations down atop a level bed of drainfield rock. Rock should then be placed over the pipe to provide a minimum of 2" of cover. 3. A silt barrier or geotextile fabdc must be placed between the drainfield rock and the natural soil backfill. 4. Monitor tubes must be 4" in diameter and installed at the locations shown on the design. The portion below ground must be perforated. Contractor shall vedfy the septic tank and drainfield are a minimum 100' away from any private water wells in the area, 150' from a Class 'C" Well or 200' from any community well. Direct bury insulation must be placed over the distribution system if less than 3' Of backfill depth is available. Finish grade over the trench must be mounded to prevent settlement or depressions. 7. Grade area surrounding the absorption trenches to drain away. A minimum 2' of accepting soil is required below the drainfield rock for a 5' wide trench. Contractor shall verify this condition prior to placement of the rock. All pockets of unacceptable materials must be removed and replaced. MATERIAL SPECIFICATIONS: 1. Septic tanks must be constructed by a municipally approved septic tank manufacturer. 2. The following pipe materials are approved for use in septic system installations in the Municipality of Anchorage: Cast Iron (perforated and solid), ASTM D3034 or P.V.C. (perforated and solid), ASTM F810 or H.D.P.E. (perforated, but not solid) and ASTM D2662 or A.B.S. (perforated and solid). 3. Insulation shall be at least 2" thick extruded direct burial polystyrene (Dow Chemical Co. Styrofoam HI or equal). 4. Septic tank inlets and outlets shall be fitted with watertight couplings (Caulder, Femco, or equal). ' Lot 5, Block 2, Skyhills Phase III July 10, 2000 Page 3 of 3 5. A permeable geotextile fabric (Typar, Mirafi or equal) must be installed between the final drain rock layer and the native soil layer. 6. All drain rock shall be .5" to 2.5" in diameter with less than 3% passing the #200 sieve. INSPECTIONS: Municipal Ordinance requires a minimum of two inspections. These inspections must be conducted under the supervision of a professional engineer registered in the State of Alaska. The first inspection must be conducted after the excavation of trenches, beds or pits and before the installation of any gravel. A septic tank may be set in place, but may not be backfllled. The second inspection must be conducted after the placement of the geotextile fabric, gravel, distribution piping, standpipes, cleanouts and insulation. No backfill should be in place at the time of inspection. · Contractor shall provide a copy of all field survey layout and construction notes for use in preparing the certified as-built of the completed system.