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Home My WebLink AboutWOOD CLIFF Plat# 98-14 Expired 02-27-98 S-10059\OC) DEPT. OF ENVIRONMENT/~L CONSERVATION ANCHORAGE/WESTERN PUBLIC SERVICE OFFICE 555 CORDOVA STREET ANCHORAGE, ALASKA 99501 August 4, 1997 TONY KNOWLE$, GOVEF~NOR R[CEIVED AUG 1,5 1997 Municipalily o~ Anchorago [)ept. Health & Human Services (907) 269-7521 Mr. Kenneth G. Lang 173I George Bell Circle Anchorage, AK 99515-3957 RE: Wood Cliff Subdivision, A Portion of BLM Lot 3 Sec.9 T12N R4W S.M. - West Dimond Boulevard; Stormwater Plan Review. AWPSA Project No. 9821-WW-183- 003. Dear Mr. Lang: This letter is to acknowledge receipt of your submittal, received in this office July 2, 1997, concerning the management and treatrnent of stormwater runoff from the above project. The Department has completed its review of the submitted information which included a cover letter, runoff design calculations, site grading plans, and a completed stormwater pollution prevention and plan review checklist. Based upon this review, it appears that steps will be taken to provide treatment and management of stormwater runoff during the construction and operational phases of this project which satisfies the concern of this Department. Therefore, in accordance with State Wastewater Disposal Regulations (18 AAC 72.600) the Department has no objection to above development subject to the following comments: Installation of all items used to treat or convey stormwater runoff during either the construction or operational phaoeo of t,,,.., project will need to be monitored under the supervision of a P.E. As-built drawings under the stamp of a P.E. will need to be submitted to this office within 90 days of completion of this project. Disturbed surfaces which are to be revegetated (i.e. swales) will need to be stabilized with a jute matting, excelsior blanket, soil binder, etc. before the onset of winter. Construction of on-site well and septic systems for these lots will need to be reviewed and approved by the Municipality of Anchorage, Department of Health and Human Services, On-Site Services Program. Request for Comments on Cases Due: April 18, 1997 Page 2 S-10055: S-10056: S-10057: S-10058: S-10059: S-10060: Iliamna Acres. The permitting and approval of the existing on-site wastewater disposal system on this property must be completed prior to approval by this department. Sand Lake Subdivision/ti. No objections. Bell Estates Phase 2. No objections provided all development is served by public water and sewer. International East. No objections provided all development is served by public water and sewer. Wood CliFE 1. Soils testing, percolation testing and ground water monitoring to confirm the suitability f~or development using on-site wastewater disposal systems. ~ f,.~ 2. Areas designated for the o~'iginal and replacement waste ~vater system disposal sites must be identified and must meet all criteria specified in AMC 15.65, including slope and slope setback requirements. ~, ~b~_,,/ 3. Supporting document~ation on water availability must be provided. ~) ~,,~ Cronquist. 1. Lot 1 Block 2 of Hett Subdivision shall be served by public water and sewer. 2. The existing on-site wastewater disposal system and well serving the office and shop located on the proposed Lot 1 Block I Cronquist Subdivision shall be shown to meet all ADEC requirements. 3. The on-site wastewater disposal system serving the cabin on proposed Lot 2 Block 1 Cronquist Subdivision must be docmnented and shown to meet all requirements of AMC 15.65. 4. The on-site wastewater disposal system serving the wood frame house located on proposed Lot 1 Block i Cronquist Subdivision must be documented and shown to meet all requirements of AIvIC 15.65. WATER RESOURCES ENGINEERS RECEIVED ~,,1AR 21 199'{ Municipality ol Aachorage Oept, Health & Human 8er¥icf/? 7321 Foxndge. ~2 , Anchorage, Alaska 99518 * (907)344~48Z WOOD CLIFF SUBDIVISION Drainage Analysis Rainfall: Fig. 2-2 Fig. 2-5 Modified Intensity Multiplier Intensity 3 hr. 10 yr. 0.22 1.00 0.22 3 hr. 100 yr. 0.31 1.00 0,31 Rational Method "C" 0.20 Location Area (Ac.) QlO(cfs) QtO0(cfs) Area 1 Off Site 3.15 0.14 0.20 Area 2 On Site 7.70 0.34 0.48 Total runoff from site 0,48 0.68 Hydrology/Ominage * Hydropower * Eromlon Control. River and Roodpllln tiyd~aullcl ,, ;¥ltlr Supply WATER RESOURC, ES ENGINEERS 7321 ~xr,~e. ~2. A~cnofa;e. Alaska 99518. (907)344~$Z I.lydr~og'f ! Dmlna~ · Ryclropower ,, Eroelon Control * River and Flooclplain Hydraullca - Water Stlpply MUNICIPALITY OF ANCHORAGE COMMUNITY pLANNING AND DEVELOPMENT P.O, Box 196550 Anchorage,-Alaeka 95619-6650 PRELIMINARY PLAT APPLICATION A. Please fill in the information requested below. Print one letter or number per block. OFFICE USE REC'D BY: 1. Vacation Code 2. Tax identification No. 3. Street Address 4. NEW abbreviated legal description (T12N R2W SEC 2 LOT 45 OR SHORT SUB BLK 3 LOTS 34). EXISTING abbreviated legal description (T12N R2W SEC 2 LOT 45 OR SHORT SUB BLK 3 LOTS 34~ full legal on back page. !1 i III IIIIIlIIIIII/lll ll l!l!i!"lllli!l 6. Petitioner's Name (Last - First) / I Address _ ~.~ · ~'~:~y City ,Z~.s~'~'~fu~,c-~ State 8. Petition Area Acreage !l[,l,I 13. Fee $ ~,,~,~_oo_ 7. Petitioner's Representative 9. Proposed Number Lots City_ ~,~r'z_~C~-~ State P one # 4'%-¢ (o zip 10. ~isting~, 11. Gdd Number 12. Zone Number Lots ~4. Gommuni~ Gouncil ~M~ ~ i,, I I hereby oartify that ([ am) (I have been authorized to act for) the owner of the property described above and that I desire to subdivide it in conformance with Chapter 21 of the Anchorage Municipal Code of Ordinance-~. I understand that payment of the basic subdivision fee is nonrefundable and is to cover the costs associated with processing this application1 that it does not assure approval of the subdivision, I also understand that additional fees may be assessed if the Municipality's costs to process this application exceed the basic fee. I further understand that assigned headng dates are tentative and may have to be postponed by Planning Staff. Platting Board, Planning Commission. or the Assembly due to administrative reasons. Signature *Agents must provide written proof of authonzatJon. Please check or fill in the following: 1. Comprehensive Plan -- Land Use Classification Residential Commercial Parks/Open Space Transoortation Related 2. Comprehensive Plan -- Land Use Intensity Special Study MaCginal Land Commercial/Industrial Public Lands/~nstitutions Dwelling Units per Acre Alpine/Slope Affected Industrial Special Study Alpine/Slope Affected Environmental Fa'ctors (if any): \ a, Wetland '~ 1. Developable \ 2. Conservation 3. Preservation b. Avalanche c. Floodplain d. Seismic Zone (Harding/Lawson) D. Please indicate below if any of these events have occurred in the last five years on the property, Rezoning Subdivision Conditional Use Zoning Vadance Enforcement Action For Building/Land Use Permit For Army Corp of Engineers Permit Case Number Case Number Case Number Case Number Legal description for advertising. Checklist ,4'0 Copies of Plat (Long Plat) 30 Copies of Plat (Short Plat) Reduced Copy of Plat (8 ~/z x 11 ) Certificate to Plat Aedal Photo Housing Stock Map Zoning Map Water: Sewer; ~/' Pdvate Wells t,/' . Private Septic Drainage Plan Topo Map 4 Copies Soils Report 4 Copies Pedestrian Walkways Landscaping Requirer;nents Communi:b/Well Community Sys. Waiver Public Utility Public Utility · R[CI!IVED APR 2 3 1997 Municipality of Anchorage , Dept. Health & Human Services P.O. Box IBO22B I{~BL D, H~NNI txnc~ s r ( (907) ~48-094~ (lox) · . DHI ~2 Civil CON SULTING ' Surveying April 7, 1997 W.O.: 97307 Mr. Karl I-lanni P.o. Box 190228 Anchorage, Alaska 99519-0228 ENGINEERS · P 1 a n n i n g RECEIVED APR ?~ 5 1997 Municipality el Ancherag. e Oept, HeaLth & Human Serwoes RE: Soils Investigation/Wood Cliff Subdivision Dear Mr. Hanni, The following is a summary of thr., soils investigation for the proposed Wood Cliff Subdivision. The subdivision consists of approximately 13.8 acres and is located on west Dimond Boulevard just west of Sand Lake Road. The parcel is to be subdivided into 5 lots. An effort was made to place the test pits in a location were the septic system will most likely be built, after consideration was given to property lines, building sites and topography of the property. The vegelation consists or a medium 1o dense growth of spruce, cottonwood, and birch trees. The ground bas an organic overburden of about 1' of material. The soils investigation was completed on March 25, 1997. There was approximately 30" of snow covering the site. Using a large track backhoe, a total of 8 test pits were dug. Their location is shown on FigureA. The north half of the property has 7' to 9' of silty sand overlaying a nonfrost susceptible (NFS) sandy gravel/gravelly sand with rocks to 8". On the south half of the property, the depth of tile silty saad is generally deeper ranging between 13' to 16'. Below the silty sands lay NFS sandy gravel/gravelly sand with rocks to 8". With the exception of test hole // 8 which lies in the center of tile proposed cul de sac, a percolalion test was run at each of the test pits. All percolation tests were run on the silty sand material about 4' to 6' below the ground surface. The soils were presoaked prior to running the tests. Percolation rates ranged between 3 to 15 minules per inch. No water was noted in any of the test pits at the time we dug the pits. All soils were very dry. Monitoring tubes were set in the test pits 1 through 7. As of April 7, 1997 (14 days), no seasonal water table has been noted. In accordance with Municipality Ordinance 15.65.180, a reserve area between 12,000 to 14,000 square feet is required for each Iol. Figure A is a schematic drawing showing the test hole locations, reserve area (14,000 s.f.) and possible locations for residential wells. Figure A clearly Dimm. I I'r, nl,,r Tmvm', 51.h INI..' ' ;lira I';, l)imond Blwl,q ' , ;t-545 * /\n,'h..'.g.,. Ah,ska !)9515 ¢!H)'11 ;144-13R~ ', Fax :14,1.1:183 shows thai on-site septic systems and residential wells can be placed on each Io[ without adversely affecting adjacent land owners. sa/dh ,,,.,ery truly yours, HI Consulting Engi~]eers Dee Hi¢l, P.E( .' ~/ Principal / cc: Gail Iii!Ih, Dill 307dh31 re.lit Municil),~llly of Anch0NIge DEPARTMENI (~J I IFALTH & HUMAN SERVICES 825 "L" Shot, t, Am:horage, Almlka 99502-0650 SOILS LOG- PERCOLATION TEST LErsAI_ DFF~r:IHI'I I,,I,I 'LJ_O/)J)_~LIFF__~_d_6j)iVl, Inld 'I'.IL I Township, Range, Sec on: 1! 12 13 !4 15 17 18 hg 20- COMMENT S . ._~? t5 s I'llu ('1 AIION FIAI'I~ I~ t r';i lu ~I,~ RETWEEN ..~..~ ~ ~o :o~. _ 2 ' ,10; ,?0 / '"/.," ~_0: OO 2" Municipalily o! Alleh0ti~ge DEPAR1 MEN I ()1 I IFALTH & HUMAN SE,qVICES 825 "L" Shmfl. AnH~orage, Alask~ 99502~0650 SOILS LOG -- PEFICOLATION TEST I 3- 5 6 7 8 ID 1! 12 13 14 17 18 lg 20 Townslflp, Range. Sec on Time " 2~: 2 t Net Drop ']': l- t. 3 LEGAl. IH:~f:ltll'l Ir HI r'~2~qc OVe. RS~I~:D~,I ! I0 11 t2 13 14 15 ,'3-0. ~-/ 16- 18 20 Ir!;I m,r BEIWEEN H'~ F]AND Net Drop Munirdpalil¥ o! AtlohOt~lJ]le DEPAFITMEN I (91 I IEALTH & HUMAN SEI-tVICES 025 "L" Slmol. A~mhorage, Al~k~J 99502-0650 SOILS LOG .-- PERCOLATION TEST I 2 3 4 7 8 g 10- 11 12 13 14 16 18- 19 20 -L H. Township, Range, Seclion: SLOPE LOT [I Net Drop Mtmicilmlily of Atlehotage DEPARTMEN I' OII I[ALTH ~ HUMAN SEilVICES 825 "L" SII~I, Auchorage, Alaska 99502-0050 SOILS LOG -- PERCOLATION TEST 16 17 18- Town*hip, Range, Section: 20 ~ Net Drop ~o: 9_o_ .............. 30: O0 _~_o_.' __o.p_ ............ ~0: O0 l f r;t Iltlr,I BE?WEEN 6'O FTAND (~'~' Fl' TI-I, 1 2 3- 4 Municilmlily ol AIl~ll01'lige DEPARTMEN I OII FI:At. TH & HUMAN SERVICES 825 "L" StruM. An< horage, Ala~k~ 99.502-0650 SOILS LOG -. PERCOLATION TEST 7 g 13 14 Township, I'langr~, Seclion: SLOPE ,v Iff lit r)l ATION RAT~ ..~ , r rJ r, ~r,i BETWEEN ,, ,~' -~ Net Drop · FI AND 5 '0 Ff r~ LEGAL DES~:IIlPI I~IN _~L~_~ 2 3 Muni~:ipalily of Af~Jtotage DEPAPlTMEN'I OF I IEALTH & HUMAN SERVICES 825 "L" SIronl, Armhorage, Alaska gg502-0650 SOILS LOG -- PERCOLATION TEST HAWN! .... 7 8 11 12 13 14 16- 17 18 19 20 COMMEHTS _ 50zL~. r.,..,:.' ~' ;',A DATE "E"~ Town~hlp, Range, Section: f d F SLOPE SI I E PLAN INA'; ~;HOUND WATER II ',l : AfWItAT Net Time . ¢o:/c', ................ IF~;I nl~N RETWEEN ,. ~,0__ FTAND .....~, ,j AcconDANCI:WIHI^II ,qrA]~ANDMUNCIPAI (;~'~IqIn'W!~INE¢/:{~OI'ONTII~SDAIE DATE: T,H, 2 3- 5 6 ? 8. 10 11 12 13 14- 11]- 18 lg 20~ COMMENTS Municillnlily of Aliehol'age DEPARTMEN'! OF l iEALTH & HUMAN SERVICES 825 "L" StfeoL Anchorage, Alaska gg502-0650 SOILS LOG ~ PERCOLATION TEST H/~NI CLIFF gl/l~IpVt' ro~'l SLOPE SI1 E PI. AN --4'. N rrlm(a A]ION t:tAI'E ,,~ , IISI IHIN BETWEEN ....... PErlI:ORMED BY ACCOnI)ANCEWIIH^II SI^IEANDMUNICIPAI_(iiiii,ilff,q~SiNEFFI.:OTONTttlSDAiE. DATE: ~/~7~"'~ / / 0.~\ oo ~ 1 0 0 5 9 ~1~¥ 7 }99? ,r public limlfed ~d parka 19 '-~/lc'--~nify Mop Scale: 1" = 1 Mile KINCAID RD, , STR~ 8 ~ ~ 9 o I0 JIG COOK INLET ~ i ~th A~. P~T OF LOTS 1 THRU 5 WOOD GLIFF SUBDIVISION CONTAINING 13.78 ACRES A RESUBDIVISION OF A PORTION OF B.L.M. LOT LOCATED WIT~ SECTIO~ 9, T ~2 ~, R 4 W, S~WARD ~R~IA~, ALASKA ANCHORAGE RECORDING DISTRICT Kenneth 6, Long Anchorage, Alaska 99515 Registered Lond Su~eyor (9o7) 345-6476 GRID: 2322 SCALE: I" = 100' DATE: MARCH 1997 DRAWN: JCL SHEET ~ OF 1 PROJECT ~: 97-37 CHECKED: K~L JOB FILE: K97057PP.ord/.pI1/K97037Pl.pll CASE #: ~;~ ~ZO / / '~Sr/S 'S±H M3IAV3S b J_OV~I± /