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Home My WebLink AboutCLOUD 9 Lots 1A & 1B S-11723Cloud Nine Lot 1A & 1B 511723 LOT lA, CLOUD NINE SUBDIVISION DESIGN FACTORS: SYSTEM REQUIREMENTS: Four Bedroom Home 5' Wide Trench System Perc. Rate: 39 Min./Inch 4 Bedroom Advantex Treatment System Application Rate: 2 GPD/SF 2' DrainfJeld Rock 4 Bedrooms X 150 GPD/2 GPD/SF (Application Rate) = 300 SF Absorption Area 300 SF/5 SF/LF*.7 (Red. Factor) = 42 LF Trench Length THEREFORE: Construct a Trench 42' Long x 5' Wide x 2' Effective Depth. Flow Line Elevation in Trench to be 2' Below Original Ground Surface. Total Depth to be 4' Below Existing Ground. Provide 4' Cover Over Septic Tank and 3' Cover Over Absorption Trench, Backfill Geotaxtile Fabdc I" Perforated PVC (Holes Down) 3/16"Holes @ 2' Spacing -- Drainfield Rock TYPICAL DEEP TRENCH SECTION (NO SCALE) NOTE: Grade Area Over Trench to Drain Away. .~.~ Minimum 6' Separat on From Bedrock ~ Mm,mum 4 S~paratlon From Groundwater. ~. ~'~ ~"~ Mini ......... mum 200 Sepa~tlon From Wells in the Area. ~At MICHAEL Minimum 100' Separation From Su~ace Water or Streams. ~:~% No. 4700 DEPTH (f=~0 1 2 3 4 5 6 7 8-- 9-- 11 MUNICIPALITY OF ANCHORAGE DEVELOPMENT SERVICES DEPARTMENT BRAGAW STREET ANCHORAGE, AK 99519-0650 SOILS LOG - PERCOLATION TEST LEGAL DESCRIPTION: LOT IA, CLOUD NINE SUBDIVISION PERFORMED FOR: CHARLES LEKITES DATE: 6/27/2002 PROJECT No.: PARCEL ID#: TECHNICIAN: OB/OG A. HARALA SLOPE SILTY GRAVEL WITH SAND GP/GM WAS GROUND WATER ENCOLEqTERED? YEs BOH @ 15.5' BEDROCK READING SiTE PLAN SEE SITE PLAN GROSS TIME NET TIME DwE,~-I~RTO INET DROF (MINUTES) (MINUTES) (INCHES) (INCHES) TES- HOLE PRESOAKED PRIOR TO TESTING: 1 16:26 0.00 2 16:41 15 0.50 0.50" 3 4 5 6 20 7/8 16:43 16~5R 17:03 17:18 17:24/17:39 lq 15 0.00 0.44 0.00 0.38 0.00/0.38 0.44" 0.38" 0.38" PERCOLATION RATE: 39 ,(MrN/rNCH) PERC. HOLE DIA. 6" (n~ci-ms) TEST RUN BETWEEN: 5 FT. and 6 FT. COMMENTS: TEST HOLE PRE SOAKED PRIOR TO TEST. TEST PERFORMED BY ANDERSON ENGINEERING. I, MICHAEL E. ANDERSON CERTIFY THAT THIS WAS PERFORMED 1N ACCORDANCE WITH ALL STATE AND MUNICIPLE GUIDELINES IN EFFECT ON THIS DATE: 7/16/2002 LOT lB, CLOUD NINE SUBDIVISION DESIGN FACTORS: SYSTEM REQUIREMENTS: Four Bedroom Home 5' Wide Trench System Parc. Rate: 3.2 Min./Inch 4 Bedroom Advantex Treatment System Application Rate: 4 GPD/SF 3' Drainfield Rock 4 Bedrooms X 150 GPD/4 GPD/SF (Application Rate) = 150 SF Absorption Area 150 SFI5 SF/LF*.58 (Red. Factor) = 17.4 LF Trench Length THEREFORE: Construct an Oversized Trench 20' Long x 5' Wide x 3' Effective Depth. Flow Line Elevation in Trench to be 2' Below Original Ground Surface. Total Depth to be 5' Below Existing Ground. Provide 4' Cover Over Septic Tank and 3' Cover Over Absorption Trenches. Natural Backfill 0 Geotextile Fabric 1" Perforated PVC (Holes Down) 3/16" Holes @ 2' Spacing Drainfield Rock TYPICAL DEEP TRENCH SECTION -- NOTE: Grade Area Over Trench to Dra~n Away. Minimum 6' Separation From Bedrock. F.....J.....2~::....~..~.~....~ Minimum 4' Separation From G~undwater. M n mum 200' Sepa~tion From Wells in the Area ~'~;;~;~"'~:'~ M'n'mum 100' Separation From Su~ Water or'Streams-~,~t 4700 MUNICIPALITY OF ANCHORAGE DEVELOPMENT SERVICES DEPARTMENT BRAGAW STREET ANCHORAGE, AK 99519-6650 SOILS LOG - PERCOLATION TEST LEGAL DESCRIPTION: LOT lB, CLOUD NINE SUBDIVISION PERFORMED FOR: CHARLES LEKITES DATE: 6/27/2002 PROIECT No.: PARCEL ID#: DEPTH 1 2 3-- 4-- 5 6 7 8 9 TECHNICIAN: 0B/0G SILTY GRAVEL WITH SAND GM SILT/GRAY SILTY GRAVEL WITH SAND GM >20% SILT 11 BOH @ 11.5' BEOROCK A, HARALA SLOPE WAS GROUND WATER ENCOLFI'YFERED? NO 20 SITE PLAN SEE SITE PLAN DEPTH TO GROSS TIME NET TIME WATER NET DROP READING (MINUTES) (MINUTES) (INCHES) (INCHES) TEST HOLE PRESOAKED PRIOR TO TESTING: 1 17:10 0.00 2 17:20 15 3.56 3.56" 3 4 5 6 17:21 17:36 17:38 17:53 15 15 0.00 4.69 0.00 4.75 4.69" 4.75" PERCOLATION RATE: 3.2 (MrNnNCH) PERC. HOLE DIA. 6" aNCH~S TEST RUN BETWEEN: 4.5 .FT. and 5.5 FT. COMMENTS: TEST HOLE PRE SOAKED PRIOR TO TEST. TEST.PERFORMED BY ANDERSON ENGINEERING. I, MICHAEL E. ANDERSON CERTIFY THAT THIS WAS PERFORMED 1N ACCORDANCE WITH ALL STATE AND MUNICIPLE GUIDELINES IN EFFECT ON THIS DATE: 7/16/2002 4700 MUNICIPALITY OF ANCHORAGE DEVELOPMENT SERVICES DEPARTMENT BRAGAW STREET ANCHORAGE, AK 99519-6650 SOILS LOG - PERCOLATION TEST LEGAL DESCRIPTiON: LOT IA, CLOUD NINE SUBDIVISION PERFORMED FOR: CHARLES LEKIT5$ DATE: 6/27/2002 PROIECT No.: PARCEL ID#: DEPTIq (feet) 1 2 6 7 11 TECHNICIAN: I r s .oL lO I OB/OG GP A. HARALA SLOPE SILTY GRAVEL WITH SAND GH WAS GROLrND WATER ENCOUNTBKBD? Y~S IF YES @ WRAT DEFTH% 9'__. DEPTH OF WATER APT]~ MONITORRqG: 7' DATB OF MONITORING: 5/~1/06 BOH @ 15' SITE PLAN SEE SIT~ PLAN DATE, 7/11/02 DEPTH TO READ NG GR. 0SS TIUE .NET TIH.EIWATER NET DROF (INCHES) (,MINUTES) J (.MINUTES) J (INCHES) TEST HOLE PRESOAKED PRIOR TO TESTING: 1 13:36 0.00 2 13:46 15 2.00 2.00" 3 13:48 4 0.00 2.56 2.56" 14:03 15 5 14:12 0.00 6 14:27 15 2.50 2.50" PERCOLATION RATE: 6 ,(M~N/n~CH) PERC. HOLEDIA. 6" 0NCHES TEST RUN BETWEEN: 5 FT. and 6 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 MLTNICIPLE GUIDELINES IN EFFECT ON THIS DATE: 7/16/02 ANDERSON ENGINEERING P.O. BOX 240773 ANCHORAGE, AK 99524 522-7773 September 1, 2010 Municipality of Anchorage Building Safety Division On Site Water and Wastewater Program 4700 Elmore Street Anchorage, AK 99507 Attention: Debbie Wockenfuss Subject: Cloud Nine Subdivision, S-11723 Water Availability Study Dear Debbie: We have collected information on several wells in the area of the proposed Seclusion Subdivision to estimate the possible depths and production rates of wells to be constructed in the future on Lots lA and lB of Cloud Nine Subdivision. Field investigations indicate a combination of wells constructed without the presence of bedrock and others indicating bedrock at depths exceeding 40'. In all cases the well are shallow in comparison to most wells in the Anchorage area with the deepest at 183' and the shallowest at 55'. No information is available on Lot 2, Paine Subdivision which falls close to Cloud Nine Subdivision. It is thought to be fairly shallow with sufficient production to support the house. The well on Lot 1, Gallagher Subdivision directly east of Cloud Nine is cased to a depth of 111'. No exact depth of the well is known, but a recent production test indicated a yield of 5.6 gallons per minute. The well on Lot 3, Gallagher Subdivision approximately 1,400' east of Cloud Nine has a well 135' deep with a production rate of 1.5 gallons per minute. The ground elevation at the well head is similar to the elevation where wells would probably be constructed in Cloud Nine Subdivision. Little information could be found on the wells located immediately south of Paine Road. It is known the wells have been in use for many years and no shortage of water has been reported. Lot 10, Block 10 Rabbit Creek Heights Subdivision is directly across Paine Road from Lots 2 and 3, Seclusion Subdivision and adjacent to Cloud Nine. The well on this lot is 183' deep and produces 3.5 gallons per minute according to the well log. Lot 9 immediately west of this lot and directly across from Lot 2, Seclusion is 130' l:::loud Nine Subdivision September 1, 2010 Page 2 deep with a production rate of 4.0 gallons per minute noted on the well log. Two production tests have been performed in the past on the well, which indicate 3.8 and 3.0 gallons per minute. A breakdown of the wells in the area with their respective production rates follows: LOTS IA AND lB, CLOUD NINE SUBDIVISION WATER AVAILABILITY STUDY WELL LEGAL DESCRIPTION DEPTH PRODUCTION - LOG PRODUCTION - TEST Galla~lher, Lot 1 >111' 5.8 GPM Gallagher, Lot 3 135' 1.5 GPM King Heights, Lot 3 127' 8.0 GPM 5.25 GPM Hunter Heights, Tract 1 90' 5.0 GPM Cinerama, Lot 17 212' 40 GPM Mountain Vale, Lot 2A 83' 20 GPM Mountain Vale, Lot lA 83' 10 GPM Mountain Vale, Lot 4 >49' 3.5 GPM Mountain Vale, Lot 5 11.0 GPM 5.25 GPM Rabbit Creek Hfs, Lot 8A 160' Unknown Rabbit Creek Hts, Lot 10 183' 3.5 GPM Rabbit Creek Hts., Lot 9 130' 4.0 GPM 3.8/3.0 GPM No development has yet occurred to the immediate east of Cloud Nine Subdivision nor is there any development to the south or southwest. Grandeur Subdivision will soon be developed to the southwest which will provide further indications of the well depths and productions to be expected on Cloud Nine Subdivision. Surface water in the form of Rabbit Creek runs through the area and to the northeast of Cloud Nine Subdivision. The presence of Rabbit Creek and the watershed area surrounding the Bear Valley area contributes to the shallow aquifer apparently serving the area. Runoff from the mountains surrounding the area is noted year 'round constantly replenishing the aquifer. Cloud Nine Subdivision September 1, 2010 Page 2 It is obvious from our study that any wells to be constructed in Cloud Nine Subdivision in the future will be placed to depths of less than 200' and will probably be founded in bedrock. The depth of the bedrock is unknown, but may exceed 50'. It is also possible bedrock may not be found as noted on Lot 3, Gallagher Subdivision which indicated no bedrock to 135'. The production rates will be sufficient to support a four bedroom home and can be expected to be between 2 and 5 gallons per minute. Sincerely, Michael E. Anderson, P.E. Attachments 4A 16 Lof lB Lof lA Lof EABBIT CEEEK HEIGHT: BLOCK LOT 2 Lof 2 Lof 3 LOT 5A :REEK CINERAMA BLOCK 2 TR D Lof 4 LOT 7 MO /NTAIN LOT 6 LOT 5 PAINE ROAD LOT 1 GALl LOT2 VACANT LOT 4 VACANT LOT 4 LOT 3 VACANT LOT 2 LOT 1 LOT 5 .~ 0 TR 1 49'~ No, CE-4381 WATER AVAILABILITY SCALE 1" = 200' PLAN