The URL can be used to link to this page

Home My WebLink AboutDEER HORN Plat# 84-179 S-6787Onx ckAcycn S LC c-- (D"--.) Us' w(-- n9 DATE: TO: FROM: SUBJECT: nicipality of Ancl,' . ge MEMORANDUM May 30, 1984 Community Planning Department Health and Environmental Protection Case #S-6787A Lots 1, 2 Deer Horn Subdivision This department requires a note on the plat adressing an engineered designed mound sewer system and lift station being required for Lots 1 and 2 Block 1. This is due to a high water table condition. With the above note on this plat, this Department can sign off the proposed subdivision. John W.~ Lynn Environmental Specialist JWL/ljw · ,~:IU~ICIP'=~LITY OF ANCHORAGES% Departmen ~, ~f Health & Environmental' :otection Environmental Health Division Case Review Worksheet Case Number) I Date Received S-6787 ~/ February 2, 1983 SubdiviSion or Project Title: Deer Horn Subdivision Comments Due By February 17, 1983 ( ~ublic sewer available ~ Community water available CoComments~ DEER HORN SUBDIVISION contour map FROM MUNICIPAL CONTOUR MAP 1977: Scale 1"--200' ~; 6 7 8 7 I,,~AR 1. 6 '1983 N ~ ." /{.~ l; \' DEER HORN SUBDIVISION slope analysis for septic systems: LOT BLOCK AREA (LESS THAN 25~)~ 2 ! 12,000 SF 3 2 11,000 SF 4 2. 2O,000 SF 5 2 12,000 SF October S A & ENGINEERS, INC. $ 7125 OLD SEWARD HIGHWAY ° ANCHORAGE, ALASKA 99502 22,. tgg2 DEER HORN SUBDIVISION SOILS INVESTIGATION Site Conditions: The proposed project is located in the Peters Cre~k area, more specifically located in the SE l/~, SE l/~, NW 1/4 of Sec. ~, Township l~ N, Range I West, Seward Meridian. The parcel is t0.0 acres. The vegetation is birch trees and alder. Proposed Construction: The proposed residential subdivision will consist of a minimum of 1/2 acre lots with a community water system. The water will be supplied by the adjoining subdivision of North- woods. The zoning in this area is "U" - unrestricted. Deer Horn Subdivision is within the special study rural development area. Field Exploration and Soils Condition: The soils investigation was performed by S & 5 Engi- neers, Inc. The project engineer for the soils investiga- tion was 3ames Sawhill. Eight test .holes were excavated with..a Case backhoe. The test hole logs and their locations are attached. Recommendations: m Ali test hole~, excavated in Block 2 indicate that these lots are suitable for septic systems. Ground water was encountered in one hole, but it is at a depth that will allow the septic system to function properly. Ground water was encountered at shallow depths in Lots I and 3, Block 1. We propose to install a curtain drain system to intercept the water riding on the dense gravel/sand encountered at 6~. This will lower the water. table in Block [ and allow the septic system to function .properly. We propose to install the curtain drain system this year, so that we may verify the water elevations on ruction on these lots. these lots next year~ prior to con~t 3ohh-E. Swan~"n, F.E. 8 7 MAR ]. 6 1983 EAGLE RIVER ANCHORAGE HOMER :.& ENGINEERS, INC. s 7125 OLD SEWARD HW~'. ANCHORAGE, ALASKA 99503 349 -6561 SOILS LOG - PERCOLATION TEST I I PEftCOLATION TEST LEGAL DESCRIPTION; ~ I~¥v~,, ~'' SLOPE 10 12 14 IS 16 17 18 19- COMMENTS TEST RUN OETWEEN "3'/-~ //' 'Ye,-,, c.;~,,~, / DATE: · ENGINEERS, INC, 7125 OLD SEWARD HWY. ANCHORAGE, ALASKA 99503 549 -6561 II PERCOLATION SOILS LOG - PERCOLATION TEST PE;IFORMEO FOR: LEGAL DE SCI[I IP 1'ION: I 5 6 7 8 9 10 11 12 !'., 14 · 15 16 17 18 19 20 SLOPE II ",, I I ' '"'"k ' I/I.. III III III 114 I,r¢ II. SITE PLAN WAS GROUND WATER ENCOUNTERED? IF YES, AT WHAT DEPTH? PERCOLATION RATE Iminulellie~ch J TEST RUN OETWEEN ~* . FT AND t~T ' F~I' COMMENTS PERFORMED CERTIFIED 0¥: DATE: "' & ENGINEERS, INC. 7t25 OLD SEWAR0 HWY?~;'' ANCHORAGE, ALASKA 99503 549-6561 SOILS I.()(; I'EIICOI.AI'I(IN I'1'SI 4 6 7 8 9 10 12 13 14 15 16 17 18 19 '20- COMMON'rs ..Department,of Health & Environmental ~4otection Environmental Health Division Case Review Worksheet Case N-mher I Date Received S-6567~ September 28, 1982 ' Subdivision or Project Title: Comments Due By October 20, 1982 Blocks 1, 2 Deer Horn subdivision with Vacation Public sewer available ( ) Community water available Comments: MEMORANDUM DATE: TO: FROM: SUBJECT: November 15, 1982 Planning Department llealth and Environmental Protection S-6567~ Deer Horn Subdivision ~l~ This department received the redesign(November 15, 1982) for the subject case. The department can approve this design. However, the 100 foot creek setback just north of Lots 4 and 5 must be shown on the plat. Also, mentioned in previous comments regarding monitoring water table and submitting to this department the monitoring data, with as-builts of curtain drain for Lots 1 and 2 prior to final approval. John T';. Lynn Environmental Specialist/ L/1jw ' ' 91-010 (5/78) Municipality of Anchorage Planning Dept, Pouch 6 650 Anchorage, Alaska Regarding: DeerHorn Subdivision Case No. S 6567 SE ~,SEZ NWl Sec~ TI§N R1W S.M. Slope Calculations Cul de saC 1ST. ?Oft.drops 18ft. in elevation. This equals a 26% slope Entire 135ft. drops 20 ft in elevation. This equals a IS%slope. LOTS 1North North .200ft. alon.t East line. 70 % of lot length drops 6l ft. This equals a 32% slope. North 130ft. along west line. 52% of 'lot length drops lOft. This equals a 31% slope. Average Slope is 18% throughout entire lot length. 2North North 130 ft. along east line. 52% of lot length drops lOft. This equals a 31% slope. North lO0ft, along I/est line. 17% of lot length drops 25ft. This equals a 25?0 slope. Average Mope is 15% throughout entire lot length. 3N North llOft, along east line. 51% of lot length drops equals a 23% slope. North 135ft along I/est line. 65% of lot length drops 22ft. a 17% slope. Average Slope is 13% thrughout entire lot length. 25ft. This This equals lN North 130ft. along East line. 65% of lot length equals a 17% slope. South 1/.Oft along West line. 100% of lot length equals a 16% slope. Average slope is 1/.% throughout entire lot length. drops 22ft. drops 22ft. This This 5N Average slope is 22%. 6N South 19Oft. along East line. 81% of lot length drops 46ft. 23% slope. South I80ft. along west line. 72% of lot length drops 48ft. 27% slope. Average slope is 20% through entire lot length. This equals a This equals a 7N South 180ft. along Uest line. 72% of lot length drops &gft. 27% slope. Average slope is 20% throughout entire lot length, This equals a gN Average slope is 3Z through entire lot length. 9N Average slope is 2% through entire lot length. Average slope is 0% 1S Average slope is 0%. 2S Average slope is 6Z. 3S Average slope is 8%. ~CROUND WATER LEVELS Soil test holes were dug on approx. Oct. 15, 1982 on lots # 1S and 3S. With in 30 hours after the test holes were dug, ground water was observed stand- ing in both holes approx. 3ft. below the ground level. On October 25, 1982, standing ground water was measured at 34 inches below ground level in test hole 1S and llin. below ground level in testhole 3S. PROJECTIONS FROM TEST RESULTS IN NEARBY TESTS IS, 2S, & 3S 2ft-6ft belou surface. 1N, 2N, 3N, 4N, 9N, & ION- §ft. to 8ft. below surface. 5N, 6N, 7N, 2fi to 4fi below surface. On site septic systems could not be installed on the less then half acre lots, under these severe ground water conditions. DRAINAGE The North half of lots 5N, 6N, and 7N, lie within the lowest portion of one of the major east to west drainage courses in the North half of Section 4. This drainage course also serves the North half of the Northwoods 320 acre subdivision and the majority of the Deer Park I and Deer Park 2 subdivisions. This drainage course has been designated "Green Belt" in the Northwoods subdivision to the East. ESTABLISHED DEVELOPMENT TREND Deer Park 1 and Deer Park 2 Subdivisions, adjoining the proposed sub~ division to the North, Northwest, and West ts 1 to 1% acres per (26 lots on 40 Acres, or 1.54 acres per lot overall.) Foxhlll Subdivision, adjoining the proposed subdivision to the South is I to acres per lot. (25 lots on 30 acres, or 1.2 acres per lot) Recent request for subdivision of Knik View Estates, located 132Ofc North, and 66Oft. West of proposed Deer I{orn Subdivision was denied for basically the same reasons. There is presently a petition underway by 60~ of the land owners in the area to have the NW/4 of Section 4 zoned R-7. ROADS The Deer Itorn Subdivision will be served by a segment of Deer Park Drive . which is not dedicated. This portion of Deer Park Drive is extremely narrow and has not been improved or upgraded due to its undedicated status. RECObIMENDATIONS The preliminary plot be redrawn to take ground water, slope, terrain, top- ography, drainage, groundwater, and existing development norms, into con- sideration. Taking all of these criteria into consideration, the subject 10 acre parcel cannot be subdivided into the 13 lots as proposed. September & ENGINEERS, INC. S W L,~UN!CIPAU'D~ CF ANCHORAG~ 7125 OLD S~ARD HIGHWAY · ANCHORAG~ A~S~ ~2 22, 1982 c~ .R. ECEI.V. ED DEER HORN SUBDIVISION PRELIMINARY SOILS INVESTIGATION Site Conditions: The proposed project is located in the Peters Creek area, more specifically located in the SE 1/~ SE l/~ NW 1/~ o! Section ~ Township 15 N~ Range I West~ Seward Meri- dian. The parcel is 10.0 acres. The vegetation is birch trees and alder. Proposed Construction: The proposed residential subdivision will consist of a minimum of 1/2 acre lots with a community water system. The water will be supplied by the adjoining subdivision of North:- woods. The zoning in this area is "U" - unrestricted. Field Exploration and Soils Condition: The soils investigation was performed by,S & S Engi- neers, Inc. The project engineer for the soils investiga- tion was 3ames Sawhill. Two test holes were excavated with a Case backhoe. The test hole logs and their;locations are attached. Recommendations: The gravel and sandy gravel soils in Deer Horn Subdivi- sion are suitable for septic systems. A more detailed soils investigation will have to be performed after preliminary plat approval to verify the suitability o! each lot. No problems are expected. 3 1982 e ~GLE RIVER ANCHO~GE HOMER '265 0 t:::~E 27· October 22, & ENGINEERS, INC. S W 7125 OLD SEWARD HIGHWAY · ANCHORAGE, ALASKA 99502 1982 DEER HORN SUBDIVISION IdUNICIPALITY OF ANCHORAOI~ DFPT. Ct: I'.e,'LT:! ENVIR 9;.l,',~.~l' jA_ GOT P, 8 lg82 RECEIVED SOILS INVESTIGATION Site Conditions: · ,..,.:-- .The proposed.,p~oject 'iS.,~:~!°ca~ed .in. the,,<Peters,..Creek.-.:....~:::; ..... . ' '"area, more specifically located- ln.the-SE;,l/~, SE 1]~ of Sec. 4, Township 1§ N, Range I West, Seward Meridian. The parcel is 10.0 acres. The vegetation is birch trees and alder. · · 'Proposed Construction: '- ........ .' ' '" ''* The proposed residential subdivisT6n'will Eo'nslst"ola ........ 'minimum o! 1/2 acre lots with a community water system. The ;': water will be supplied by the adjoining subdivision o! North- woods. The zoning in this area is 'U" - unrestricted. Deer Horn Subdivision is within the special study rural development area. Field Exploration and Soils Condition: The soils-investigation was periormed by 5 & S neers, Inc. . The project engineer for the soils tion was 3ames Sawhill.. Eight test holes were with a Case backhoe. The test hole logs and their are attached. Engi2' investigao.. excavated.,'' locations'. Recommendat ions: All test holes excavated in Block 2 indicate that these lots are suitable for septic systems. Ground water was encountered in one. hole, :but, it', is at a depth that will allow the septic system'to' function properly. Ground water was encountered.at.shallow depths in Lots I and 3, BloCk 1. We propose to install a curtain drain system to intercept ~the · water riding on the 'dens& gravel/sand encountered, a't :':6e:'' '.This will.:..lower the water · table in Block I and allow.;.~the ,septic sy,stem to function .... "." :. properly. .We' propose,' tb ..'install'-the curtain drain '.system .~:.'. ,..., · ~ '.this year, so that we'rn~.:.'verify', the wat~'r .'.'el'evatlbns,~',on;-.. these lots next 'year, .prior; to co.n~tructlon on these lots. .u,;~': · . -~ · . .. ,. , .o : .~;'.Q :~?. & ENGINEERS, INC. s 7125 OLD SEWARD 'H~/~';:" ':':":'; .... u' '%~L'S'rOG' '?'"'"'"~' ANCHORAGE, ALASKA 99503 349 - 6561 13 PEnCOLAT~ON TEST SOILS LOG - PERCOLATION TEST PERFORMED FOR: I~EGAL DESCRIPTION: 9 $ SLOPE SITE PLAN 10- WAS GROUND WATER 11 ~_~r&,~t ~ ~a/ ENCOUNTERED? 15- 16- 17- 18- 19- -- ' PERFORME~O... BY: ' Date Time PERCOLATION RATE '- ; Vi.~;,! (t~ .I Net & .'ENGINEERS, INC. s ANCHORAGE, ALASKA 99503 349 - 6561 '"" --I--- PERCOLATION TEST SOILS LOG - PERCOLATION TEST PERFORMED FOR: LEGAL DESCRIPTION: I 5 7 " 8 10 11 12 SL SITE PLAN 'II ~ l{ ~11 :' 1~1 I1~1. I11 -Ill 'Ill' ILl =ILL II. WAS GROUND WATER ENCOUNTERED? IF YES, AT WHAT OEPTH? Read;rig Date Time I LO' 'l I JOHN [. SWANSON..' 1834-E & ENGINEERS, INC. · t~ 7125 OLD SEWARD .H'WYJ.*'J f"~. ,, '.-,--= LU. . '' ANCHORAGE, ALAS~:A 99~03 ' ' = 349-6561 e.c( lat.~N .. SOILS LC)C; PEIiCOLATIC)N TES1 .~, 7 8 9- 10- 11 12 13 IF YES. AT WHAT DEPTH~ " S 1834-[ ,o .. ,,-... ..,.:~:;¢~-/;) ' ,~s~ ,~, ,,w,, ~. ' . ' Z'-:'_ ..... ' ENGINEERS, INC. ANCHORAGE, ALASKA 9'9503 ...... *:' :" ..... 349-6561 "' ;~/' .Encot^:nO~ ~ rEST S 7 8 ,9 10 I! '12 ~,. SOILS LOG -- PERCOLATION TEST PE.,o.~o ,o,,' ~...... t%o,-~, ,, _, ~ ,,^,E ,.,,OR,~EO: ~..,~__-'.'.'.'.'.'.'.'.'.~__ / SLOPE SITE PLAN I WAS GROUND WATER ENCOUNTEREO? P E ,,, f.O' txt/_' · .. 19 ' q"~ F'//O~" O'A~: '1' ' : ' ' ' ' '*"" :;" ~-~,,,,___//_... .:. . . ........ '.....i'~:'", & ENGINEERS, INC. ANCHORAGE, ALASKA'99503 - s ~ 349-656~ SOILS LOG -PERCOLATION TEST / SLOPE · o'- z' ~,'~ .~/So.~- 5 6 7 8 9 10 11 '12 SITE PLAN IF YES, AT WHAT 20 ~ ' ' FT '~lJ~J~k ~ 7125 OLD SEWARD .'WY, ENGINEERS, INC, ANCHORAGE, ALASKA 99503 ~ 349 - 6561 '/~"E'COCAhON tEST SOILS LOG -PERCOLATION TGSI SITE PLAN ENCOUNTERED) ! I · WAS GROUND WATER '12 IF YES. AT WHAT ENGINEERS, INC. 7125 OLD SEWARD HWY.. ANCHORAGE° ALASKA 99503 549 -6561 · SOILS LO(3 -PERCOLATION TEST rEST I 5 6 7 8 9 SLOPE SITE PLAN 11 '12 WAS GROUNO WATER ENCOUNTERED~ IF YES. AT WHAT Time ':' & ENGINEERS, INC. 7125 OLD SEWARD H'WY. ANCHORAGE, ALASKA 9950:5 349 -6561 SOILS LOG .- PERCOLATION TE$1 I 2 3 7 8 9 10 II '12 13- 14 15 16 !7 18 19 20- SITE PLAN WAS GROUND WATER ~)_ S ENCOUNTERED? S/~/~ ~ ,F'ES. ATW.AT DEPTH) .... JOHN £ SWANSON 1834-E '"' ' ~< ~ 7 '"'" · :.' TEST RUN BETWEEN FT AND , ~T · '-. : ~ · , .. . ,..,. . ..:~.,.~,' ] COMMENTS '." ' ' ...... ' ' '~ ': · ' ' ' ~ = ~ ' :~'~ ' ';'~," , .......... ....' . ~" ; ". .... ' /0/'~.~-/~' " " & ENGINEERS, INC. $ 7125 OLD SEWARD HIGHWAY · ANCHORAGE, ALASKA 99502 October 22~ 19g2 Municipality of Anchorage Platting Section ..- 632 W. 6th Ave, Anchorage~ Alaska 99501 ATTN: RE: Christine Broders Deer Horn Subdivision Dear Christine: This letter is in response to your request for addition- al information concerning the water system for Deer Horn Sub- division, The water will be supplied by Chugiak Utilities~ Inc. This utility company is currently supplying water for North Woods Subdivision which is adjacent to Deer Horn Sub- division to the west. The well is located in Tract "A"~ of North Woods Subdivision~ approximately gOO feet from Deer Horn Subdivision. Enclosed is a letter from George C. Wilmoth~ President o! Chugiak Utilities~ inc.~ stating they will supply water to this subdivision. This must be approved by Alaska Public Utilities. We have verbal approval from the commission. If you have any further questions~ please call me at 3t~9-6561. TRS:dd 3ob 2623 EAGLE RIVER ANCHORAGE ' HOMER {907) 694.9846 {907) 349.6561 (907) 235-8179 George C. Wilmoth 308 G Street, Suite 211 Anchorage, AK 99501 S & S Engineers Inc ATrN: Jim Sawhill 7125 Old Seward Anchorage, AK 99502 October 21, 1982 This is to inform you of our intentions to extend our present water service to inclt, a~ the property described as T15N R1W Sec 4 S.M. which is proposed to be known as Deer Horn Subdivision. Our existing system at Northwoods Subdivision will acco~odate the pro- posed subdivision. However, this offer is subject to the extension approval of the Alaska Public Utilities. Sincerely, George C. ~Wilmoth President Chugiak Utilities Inc. De r n MUNICIP'~LITY OF ANCHORAGE Departme~hof Health & Environmenta]'~otection · ~vironmental Health Divisi~ Case Review Worksheet S-6673 December 2, 1982 Subdivision or Project Title: Comments Due By December 17, 1982 Deer IIorn Subdivision ( ) Community water available October 22, & ENGINEERS, INC. S - 7125 OLD SEWARD HIGHWAY * ANCHORAGE, ALASKA 99502 SOILS INVESTIGATION Site Conditions: The proposed project is located in the Peters Creek area, .more specifically located in the 5E l/~, 5E 1/~, NW t/q of Sec. q~ Township 15 N~ Range ! West~ Seward Meridian. The parcel is lO.0 acres. The vegetation is birch trees and alder. Proposed Construction: The proposed residential subdivision will consist o! a minimum o! 1/2 acre lots with a community water system. The water will be supplied by the adjoining subdivision of North- woods. The zoning in this area is "U" - unrestricted. Deer Horn Subdivision is within the special study rural development area. Field Exploration and Soils Condition: The soils investigation was performed by S & 5 Engi- neers, Inc. The project engineer for the soils investiga- tion was 3ames Sawhill. Eight test holes were excavated with a Case backhoe. The test hole logs and their locations are attached. Recommendations: All test holes excavated in Block 2 indicate that these lots are suitable for septic systems. Ground water was encountered in one hole, but it is at a depth that will allow the septic system to function properly. Ground water was encountered at shallow depths in-Lots I and ~3, Block 1. We propose to install a curtain drain system to intercept the water riding on the dense gravel/sand encountered at 6t. This will lower the water table in Block I and allow the septic system to function properly. We propose to install the curtain drain system this year, so that we may verify the water elevations on these lots next year~ prior to construction on these lots. 3oh~-/i E. Swan~'~ 3~fl~ 2'23 . (~__I~C./ ~ S b b7 3 EAGLE RIVER ANCHORAGE HOMER (907) 694.9846 (907) 34~6561 (907) 2358179 '* '& 'ENGINEERS, INC, 7125 OLD SEWARD HW~', ANCHORAGE~ ALASKA 99503 349-6561 SOILS LOG - PERCOLATION TEST PERCOLATION TEST 8 SLOPE SITE PLAN 10- I1 ~ROFESSIO~ 20- WAS GROUND WATER /) t"} S E ~<o.~., $;1~ IFYES, ATWHAT OEPTH, /~A. __ Reedlng Oate Time Time Net S, '. & *ENGINEERS, INC. 7125 OLD SEWARD HWY. ANCHORAGE' ALASKA 99503 349 -6561 PERCOLATION TEST SOILS LOG - PERCOLATION TEST LEGAL DESCRIPTION: ~,, .) ~. '- ~'~o*~-- I 5' 6- 7- 8- 9- 10- 11- 12 :'., 14 15- 16 SLOPE '7.~'- Iq' WAS GROUND WATER ENCOUNTEREO~ IF YES. AT WHAT OEPTH? SITE PLAN P E 17, 18 19 20 JOHN E SWANSON..' 1834-E .5" /: :52 PERCOLATION RATE (mlnuleslinch I TEST RUN 8ETWEEN ~-"~° . FT ANO ~ ' . F.T COMMENTS PE~F~flMEO 0¥: ' · &' ENGINEERS, INC. ANCHORAGE, ALASKA 99503 SC)ILS LOG PEr{COLATI[)N TESI 3 7 8 9 tO Il 12 I :~ 14 SLOPI SITE PlAN 15 16 17 18 19 JOHN E SWANSON 1834-E 20 PERCOLATION RATE TEST RUN OETWEEN COMMENTS PE RI:ORMEI) 0¥: ', &* ENGINEERS, INC. s 7125 OLD SEWARD H'WY, ANCHORAGE, ALASKA 99503 349 -6561 PERCOLATION tEST PEHFOHMED FOR LEGAL OE$CfIIPTION I 5' 6 7 8 9 10 11 '12 14 , 16 19 '20 SOILS LOG -- PERCOLATION TEST SLOPE SITE PLAN P E IF YES. AT WHAT : ~ ! Read;rig Dale Time P'EflCOLATION RATE Time (minute$11nchl FT &'ENGINEERS, INC. 7125 OLD SEWARD H'WY. ANCHORAGE, ALASKA 99503 349 -6561 SOILS LOG -PERCOLATION TEST LEGAL DESCRIPTION __ I 2 3 4 5 6- 7- 8- 9- 10- 11 14- 20- COMMENTS PERFORMED BY: < ,z'7o $; t~ / %,o.,.,~ PERCOLATION RATE d/'*~ ('~g~' {m;fluUlllinCh! TEST'RUN 6ETWEEN , FT AND ~ * FT ~- ~-~ =~: .... ,,.~..,..~ · .. & ENGINEERS, INC. 7125 OLD SEWARD H'WY. ANCHORAGE, ALASKA 99503 3~9-esm TEST SOILS LOG -PERCOLATION TEST I 5 6 7- 8- 9- 1'1 I.I Iii Ill III Ill III II1~ I I1~ II1' /Il t_11 /.?J t ,. ,~, ~,fl I -~ ' ./,, ~ Kill 10- I1 14- 15- 16- ~- / 18- 19- 20- COMMENTS PE~FORMEO 8¥: WAS GROUND WATER ENCOUNTERED~ IF YES. AT WHAT DEPTH) fle~d;ng TEST'RUN OET1NEEN ,~t ,- FT AND "'7' . FT /,~..//j..;..,~ ~,.,,D,..~..~.~ . ~-_~, .* &' ENGINEERS, INC. 7125 OLD SEWARD H'WY. ANCHORAGE, ALASKA 99503 349 -6561 · SOILS LOG .- PERCOLATION TEST I I PERCOLATION TEST SLOPE SITE PLAN I 5 6 7 8 9 I0 II '12 '13 14 15 16 !7 18- 20- WAS GROUND WATER ENCOUNTERED? IF YES. AT WHAT DEPTH~ Read;rig 4 COMMENTS PERCOLATION RATE TEST'RUN BETWEEN Time Time /:/o I1-;. I,'.~ o I~_~;.. I : q7 ~7~;.. ;T ANO (m;nule$llnch) FT · - ' : ENGINEERS, INC. s 7125 OLD SEWARD HWY. ANCHORAGE, ALASKA 99503 349 -6561 SOILS LOG -- PERCOLATION TEST 7 8 9 I0 11 '12 '13 14 PLAN WAS GROUND WATER ENCOUNTERED? IF YES, AT WHAT DEPTH~ P Net Depth to " Ntt T~me Water D,oP 15 16 ~7 18- '19 - 20- COMMENTS , ". J01 . SWANSON )ROFESSIO~ PERCOLATION RATE TEST'RUN BETWEEN unicipa i of POUCH 6-650 ANCHORAGE, ALASKA 99502-0650 (907) 264-4111 TONY KNOWLES. ~fA YOII DEPARTMENT OF HEALTH AND ENVIRONMENTAL PROTECTION March 16, 1983 James Sawhill S & S Engineers, Inc. 7125 Old Seward Highway Anchorage, Alaska 99502 Subject: S-6673 Dee~ Horn Subdivision This will continue correspondence concerning the proposed Deer }lorn Subdivision(S-6673) ending with your letter of January 27, 1983. We appreciate receiving the additional information contained in your above referenced letter, and submit herewith the following comments: (1) The curtain drain design and configuration should mitigate the ground water problems in the southeast portion of the proposed subdivision. We do suggest, however, that the outfall of the curtain drain be extended well into the drop-off portion of Lot 1,.which is approximately 150 feet north of the south line of Lot i instead of the 80 feet shown on y6ur map. There should also be a water monitoring station on Lot 1 to determine if the curtain drain has had any detrimental effect on Lot 1. (2) Your area and slope summary and plat coupled with the available topography maps does indicate that there are areas on Lots 3, 4, and 5 of sufficient size to support the on-site disposal systems and replacements. This assumption, of course, is contingent upon there being no shallow groundwater underlying these areas. Assuming that these areas(shaded areas) are to be used for on-site disposal, then there can be no driveways, parking areas or construction within these areas. This could present problems of access to Lots 4 and 5 and to the building site on Lot 4, particularly with the 100 foot creek setback restriction.' James Sawhill S & S Engineers, March 16, 1983 Page Two Inc. (3) Prior to final plat approval, monitoring of the ground water(using the 1" perforated standpipe or other means acceptable to the DHEP) in all eight(8) perc holes(or monitoring stations) must be conducted at least once each month for a three(3) month period. The final month of this three(3) month period must fall between June 1 and October 15. Should you have any further questions concerning our comments, please contact this office at 264-4720. Sincerely, Robby Robinson Environmental Engineering Program Manager RWR/ljw cc: Jerry Weaver Planning Department Note: we are in dire need of the topography map for this area T15N R1W Section 4 January 27, S & ENGINEERS, INC. S W 7125 OLD SEWARD HIGHWAY · ANCHORAGE, ALASKA 99502 1983 John Lynn Department of Health & Environmental Protection 825 L Street Anchorage, Alaska 99501 REs Deer Horn Subdivision Preliminary Plat Dear John: Enclosed is the information you requested for approving the prelim~nary plat of Deer Horn Subdivision. We have slightly modified the plat to address the platting staff's concerns on slope. We have completed an area and slope table which we have also enclosed. We have provided a curtain drain design sheet which indicates our groundwater monitoring locations. My under- standing is that a member of your staff noted groundwater at a higher elevation on Lot 3, Block 2 than is noted on our soils logs. We intend to install a monitoring pipe at this location to verify this. If higher water is indeed noted we will install a curtain drain in this area to handle the problem. We have provided a topo sheet which indicates areas that meet the health requirements for septic systems. Each/ slope-effected lot has an area greater than 10,000 sgua~e feet which is less than 25% slope. If you have any questions or require any additional information please call me at 349-6561. Sincerely, E~n~TnSeeSrawhill JS:mbs Job 2623 EAGLE RIVER ANCHORAGE HOMER N DEER HORN SUBDIVISION contour map N DEER HORN SUBDIVISION slope analysis for septic systems: LOT BLOCK AREA (LESS THAN 25~} 2 i 12,000 SF 3 2 11,000 SF .4 2. 20,000 SF 5 2 12,000 SF DEER HORN SUBDIVISION AREA AND SLOPE SUMMARY LOT 2 1 2 3 4 5 6' 7 BLK 1 1 2 2 2 2' 2 2 2 AREA R-W AREA TOTAL AREA SLOPE (SQ. FT.) (ACRES) 29,000 12,150 41,150 .94 3.33 25,500 13,000 38,000 .87 12.57 27,715 3,450 31,165 .71 13.57 26,800 ·3,345 30,145 .69 10.85 39,000~9.__~_ _7,500 29,000 12,129 51,129 1.17' 14.51 ~A ~'8i 68,481 ~1.'57-+~.~____1_6__.33~ 3,250 32,250 .74· 2.98 28,000 9,270 37,270 .86 3.21 SLOPE CALCULATED USING R-10 FORMU'LA' S = lXLX.0023 A .... 5::'-'z.: .. ./ DATE: TO: FROM: SUBJECT: vt[, m p hty of MEMORANDUM February 4, 1983 Planning Department - Jo Ann Health and Environmental Protection Case #S-6673: Deer Horn Subdivision - Prelimimary Approval This department has reviewed the revision of the subdivision with the curtain drain design on the plat and other data, as monitoring of water table, also, data addressing topography and slope as to assure lots can support on-iste sewer systems. This department can now approve the preliminary plat for Deer tlorn Subdivision. John W. Lynn Environmental Specialist JWL/ljw 91-010 (5/78} Jan. 5, 1983 Mr. Jerry %;eaver, Planning Dept. 5-6567 l~er }lorn S Ad(]~-n~ua to Comments of ll/15~q~_ This Department recommends a 100' setback easement from the existing drainage course along thc northern boundary of the proposed subdivision. This drainage course serves as the primary drainage for a portion of the Deer Park Subdivision and all of the Morth%~oods Subdivision. The relnaining l~rtion of lots 4 and 5 lying outside of the 100' setback is situated on a 25% slope· Conventional on- site waste water disposal facilities could not be utilized under this severe slope condition. There appear to be some discrepancies concerning the presence of shallow ground water under a sizeable l~rtion of the pro- posed subdivision. Thc Department reco~menns that additional tests and ground water levels bc r~nitored on each proposed lot at a test site approved by thc Department· These omserT ~shp~.~d_be_gond~ed duri_~3__thO-~er.iOd__Q~_Ap~ 1 ~~Pt- 1, at a fr~-~a~-~%~y not to exceed 16 day~, so as to allo%~ fo~-~tabilization of ground %;ater conditions. This Department recommends that held until the above conditions preliminary approval be with- are completely satisfied. RCP.~I1/su/D29 Robert C. Pratt, Acting ..J M L LABORATORIES, INC. · · 7127 Old Seward Highway · Anchorage, Alaska 99502 .'. SOIL AND MATERIALS TESTING 907-344-8551 " LETTER OF TRANSMITTAL ............ :--TO: ....... ALASKA DEVELOPMENI CONSULTANTS: ATTENTION: SUBJECT: OUR JOB NO. An6horage, AK STEVE WEATHERMAN FOX'HILL (Triad) 83-347.39 (46A) . Transmitted herewith is/are the following: 'Two Daily Reports - 347,39 da~ed 7/26/83: 347.46A dated 1119/83 -TRIAD ENGINEERING JML LABORATORIES, INC. DATE 12/28/83: IIIGIIEBUIIo:'* = ~ ' ~':*: '"'?*~' "' ''-''~ - '** ':~ * *: :-,=-' ,',. ',., :.~ , i AND ~SOCIATES INC.':~,~'::=~;~'";" .... '~ asn,~ ........ . ...... r I · .:.,- I ' ~ ~ F~t"~ ' * -~--._.~.,, ~' -,:,'~--=-~.,, ".:. DATE. - ..~ *- ' ':- F R 0 M DATE MESSAGE REPLY " ' - ' ' · SIGNED ......... ~ ............... ~, ...... , ' DETACH AND FILE FOR FOLLOW-UP