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HomeMy WebLinkAboutTIMBERLUX #4 Block 1 Lots 10 & 11 S-5400L.c T /o-II ~..~.~.~ MUNICIPALITY OF ANCHORAGE · i~I DEPARTMENT OF HEALTH & ENVIRONMENTAL PROTECTION ENVIRONMENTAL H E A L T H C~SE~R'~7[-I~'~W~R'K- S H _.E E T [] PLAT~!~~-~] pLANNING & ZONING CASE NUMBER / NAME ~'~ S-5400 / Lots 10, 11 Block 'f Timberlux S/D June 2, 1980 ;' ,, .~,,~ ~:::, ,,.~, , ~PUB~IC WATER~VAILABLE TO PETITION AREA ~PUBLIC SEWER NO. AVAILABLE TO PETITION AREA REV;EWER'S COMMENTS: 71-014 (Rev, 2/78) DEPARTMENT OF HEALTH & ENVIRONMENTAL PROTECTION ENVIRONMENTAL HEALTH CASE REVIEW WORK SHEET ~ [~ PLATTING BOARD [~] PLANNING & ZONING S-5335 Lots 10, 11, 12 Block I Timberlux Subdivision February 27, 1980 COMMENT TO PLANNING BY March 17, 1980 '~ [] PUBLIC WATER NOT AVAILABLE TOv~TITIO? AREA ~ PUBLIC SEWER NoT AVAILABLE T~PETITION'~REA REVIEWER'S COMMENTS: / ~ ~ 71-014 (Rev. 2/78) 825 "L" STREET ANCHORAGE, ALASKA 99501 (907) 264-4111 GEORGE M. SULLIVAN, MAYOR DEPARTMENT OF HEALTH AND ENVIRONMENTAL PROTECTION September 29, 1980 Leslie L. Brattain, P.E. Tryck, Nyman & Hayes 740 I Street Anchorage, Alaska 99501 Subject: S-5400 - Timberlux Subdivision This department has reviewed the soils of September 18, 1980, as submitted for the above subject and finds the tests adequate to support on-site sewer systems. If there are any further questions, please call this department at 264-4720. Sincerely, John W. Lynn Environmental Specialist JWL/ljw TRYCK ~ office/74(x~.~}reet Anchorage, Alaska 9950L /907-279-0543/,~..ble TNHANCAK/Telex 090-25332 NYMAN ~HAYE% ENQINEERS / PLANNERS / SURVEYORS 8195.0 September 24, 1980 Municipality of Anchorage Dept. of Health & Environmental Protection 825 L Street Anchorage, Alaska 99501 MUNICIPALITY OF ANCHORAGE DEPT. OF HEALTH & ENVIRONMENTAL PROTECTION. SEP ,~ ,~ RE~CEIVE. D ATTENT I ON: Mr. John ~.L._y_nn SUBJECT: ~. Timberlux Subdivision, (Case S-5400) Dear John: ~ - .......... - Attached please find a copy of the soils report from Alaska Test Lab, dated September 18, 1980, in which they state the proposed sub- division does have practical building sites in areas which have soils suitable for a disposal system. This report should allow you to forward a memo to the planning department which would satisfy condition 4 of the plat approval which requires providing acceptable soils information for lots 10 and 11 of the proposed subdivision. If you have any questions or comments on this matter or require any further information, please contact us. Very truly yours, TRYCK, NYMAN & HAYES Leslie L. Brattain, P.E. dhs cc: Scott and Kathy Ulmer 278-1551j~UNICIPALITY OF A~E 4040 "B" STREET ANCHORAGE, ALASKA 99503 (907) DEPT. OF HEALTH & ENVIRONMENTAL PROTECT[ON September 18, W.O. #A19372 Grid 3136 1980 SEP 2 4 1980 R CEIVED Box 520 Homer, AK Scott Ulmer 99603 :Subject: Subsurface Investigation for Suitability of On-Site Waste Water Disposal System Timberlux Addition #4, Lot 11, Block I Dear Mr. & ¥~s. Ulmer: Transmitted herein in accordance with your instructions are the results of the above referenced investigation as performed by us on July 23, 1980 and September 8, 1980. The scope of this project is to investigate the suitability of the area for an on-site waste water disposal system. Lot 11 is the north half of a 5 acre tract that is being subdivided into two lots. It is our understanding that there is an existing home and an existing system that is functioning already on Lot 10 which comprises of the south half of the parcel. Included in this transmittal are: Test Hole Location Sketch Test Hole Logs Standard Explanatory Information Figure 1 Tables A-F Sheets 1-3 The exploration was conducting using a continuous flight solid stem auger. The rig is owned and operated by Denali Drilling, Inc. There were two phases of the exploration. The first phase conducted on July 23, 1980 included the placement of three holes (Test holes #1, #2 and #3). That work was supervised and the test holes logged and percola- tion run by Mr.'Terry L. Barber engineering geologist for Alaska Testlab. The results of these tests were unsatis- factory. Though the soils were fairly permeable, the ground water table was quite high. Therefore, the area where the .test holes were placed was unacceptable for placement of on- site sewage disposal system. At that point, we then carefully walked the lot, looking at the topography of the entire parcel to identify the most likely building sites. There seem to be two. The first is Mr. & Mrs~ Scot~ lmer September 18, Page 2 along the eastern edge of .the property and the second is along a ridge that runs in a northwesterly direction in the southwest quarter of the property. On September 8, 1980, three additional test holes were drilled, Test Holes A, B, and C. They are located on the enclosed test hole location sketch. Test Holes A and B were placed along the eastern ridge near the 30' access easement and Test Hole C was placed in the middle of the ridge to the west in the southwest quadrant of the property. Good, practical building sites and area to place an on-site sewage disposal system are available at both locations. The logs of the test holes are included as Tables A-F of this report. In interpreting these logs, it would be helpful to utilize the standard explanatory information obtained on Sheets 1-3 of this report. Test Holes 1, 2 and 3 were placed in the swale between the two ridges. The water table in those holes was at 10", 40", and 46" respectively. No on-site sewage disposal system ' should be placed in this area. The swale runs generally from the southeast corner of Lot 11 to the northwest corner of Lot 11. Slotted 3/4" plastic pipe were placed in Test Holes A and C and a percolation test run in each hole. The tests were conducted by filling the hole full of water and leaving it overnight to saturated. UD0n returning the next day, the hole was refilled with water and the rate at which the water level fell inside the perforated pipe was measured at 10 minute intervals over an hour and twenty minutes. The percolation rate was then calculated as the rate for the last 30 minutes of the test. Percolation rate for Test Hole A is 10 minutes per inch, which is valid for the brown Sil~y Sandy Gravel soil layer from 6' to 16'. This material is a dense gl-~al till. The percolation rate for Test Hole ~ was 20 minutes per inch. The soil layer tested was the brown, Silty Sandy Gravel, from 3' to 16', whose unified classi~-i-~ion is GM. This material is a dense glacial till. We hope this report is satisfactory to your present needs. Should you have any questions with regard to any item con- tained within this report, please do not hesitate to contact Very sincerely, ALASKA TESTLAB MRN:rb Melvin R. Nichols~ P.E. Enclosures Laboratory Manager GR££N?OINT ~Test .Hole A Depth in Feet From To 0.0' 0.5' 0.5' - 1.0' 1.0' - 6.0' 6.0' - 16.0' Table D mO #Al 9372 :Date: 9/8/80 Logged By: O.M. Soil Description Brown Peat, PT, moist, soft. F-4, brown Sil~, ML, NP, soft, moist.. F-4, brown Gravelly Sandy Silt, ML, moist, very stiff, NP, subrounded particles to ~". F-l, brown Silty Sandy Gravel, GM, moist, dense, poorly graded, ~aximum subrounded particle to 3". Hatch Bottom of Test Hole: Frost Line: Free Water Level: Remarks: 16.0' None Observed None Observed Percolation test run on 6.0'-16.0' Results of 10 min/inch. soil layer from final 30 minutes Sa. No. Depth Type of Dry 'BlowsJ6" M% Sample Strength Group Unified I 5.0' -- - G - - ML 2 10.0' -- - G - - GM 3 15.0' -- - G - - GM Remarks: 1. 3. 4. 5. 6. Type of Sample, G=Grab, SPT = Standard Penetration, U = Undisturbed. Dry Strength, N=None, L=Low, M=Medium, H=High. Group refers to similar material, this study only. General Information, see Sheet 1. Frost and Textural Classification, see Sheet 2. Unified Classification, see Sheet 3. !Test Hole B Table E WO #A19372 Date: 9/8/80 Logged By: O.M. Hatch Depth in Feet From To 0.0' - 0.5' 0.5' - 1.0' 1.0' - 16.0' Soil Description Brown Peat, PT, moist, soft. F-4, brown Silt, ML, NP, soft~ moist. F-4, brown Gravelly Sandy Silt, ML, NP, stiff, moist, becoming more gravelly with depth, maximum subrounded particle size 3". Bottom of Test Hole: Frost Line: Free Water Level: Remarks: 16.0' None Observed None Observed No percolation test run. Sa. No. Depth 5.0' 10.0' 15.0' Type of Dry Blows/6" M% Sample Strength Group Unified -- - G - - ML -- - G - - ML -- - G -. - ML Remarks: 2. 3. 4. 5. 6. Type of sample, U = Undisturbed. Dry Strength, N=None, L=Low, M=Medium, Group refers to similar material, this General Information, see Sheet 1. Frost and Textural Classification, see Unified classification, see Sheet 3. G=Grab, SPT = Standard Penetration, H=High. study only. Sheet 2. ,Test Hole C Table F WO #A19372 Date: 9/8/80 Logged By: O.M. Hatch Depth in Feet From To 0.0' - 0.5' 0.5' - 1.0' 1.0' - 3.~' 3.0' - 16.0' Soil Description Brown Peat, PT, moist, soft. F-4, brown Silt, ML, NP, soft, moist. F-4, brown Gravelly Sandy Silt, ML, NP, stiff, moist. F-l, brown Silty Sandy Gravel, GM, with few cobbles, moist, poorly graded, medium dense, 6" maximum particle size. Bottom of Test Hole: Frost Line: Free Water Level: Remarks: 16.0' None Observed None Observed Percolation test run on soil layer from 3.0' .to 16.0'. Result~ of final 30 minutes 20 min/inch. Sa. No. Depth I 5.0' 2 10.0' 3 15.0' Type of Dry Blowsy6" M% Sample Strength Group Unified -- - G - - GM -- - G - - GM -- - G - GM Remarks: 1. 3. 4. 5. 6. Type of Sample, G=Grab, SPT = Standard Penetration, U = Undisturbed. Dry Strength, N=None, L=Low, M=Medium, H=High. Group refers to similar material, this study only. General Information, see Sheet 1. Frost and Textural Classification, see Sheet 2. Unified Classification, see Sheet 3. Hole ~able A WO #Al 9372 Date: 7/23/80 Logged by: T.L. Barber Depth in Feet From To 0.0' - 1.5' 1.5' - 5.0' 'Soil Description Topsoil. F-l, grey Silty Sandy Gravel, subrounded 1-1/2", gravel, saturated, dense. Bottom of Test Hole: Frost Line: Free Water Level: 5.0~ .None Observed 10" Test Hole #2 Depth in Feet F~om To 0.0' - 1.5' 1.5' - 10.0' Table A ~0 #A19372 ~Date: 7/23/80 .Logged by: T.L. Barber Soil Description F-4, Topsoil. F-l, grey Silty'Sandy Gravel, 2" subrounded gravel, well graded, wet to saturated, very dense, GM. Bottom of Test Hole: Frost Line: Free Water Level: 10.0' None 3'4" Observed Test ~Hole ~3 Table A WO #A19372 Date: 7/23/80 Logged by: T.L. Barber Depth in Feet From To 0.0' - 1.5' 1.5' - 15.0' Soil Description Topsoil. Olive very Silty Sandy Gravel, 1-1/2" subrounded gravel, moist to saturated, dense, GM. Bottom of Test Hole: Frost Line: Free Water Level: 15.0' None Observed 3~10"