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HomeMy WebLinkAboutSTUCKAGAIN MANOR Block 1 Lots 3, 4, and 7 Block 2 Lots 3, 6, 9, and 12 Soil Information 4040 "B' Stree! Anchorage, Alaska 99503 Phone (~7)27~,15~t (Telecopier~7)272-5742) 3, 1981 ~D13370 1135 W. 8th Avenue Anchorage, Alaska 99501 Subject: Subsurface investigation for sewage disposal, Lots 3, 4, 12 Block 2, Stuckaga n Manor Dear Mr. Bachner: OCT 2 1 1981 RECEIVED suitabi ity of on-site 7 Block t; Lots 3, 6, 9, Transmitted herein are the so boring logs and percolation test resu'ts for the test holes placed on the subject ~ots. Also included are results of laboratory testing on selected samples, and a ocation sketch for the test holes. A previous soils investigation was performed for this area by Alaska Test ab, which consisteo of 9 test holes, 3 of which had percolation tests run n them. A copy of this report is attached. This recent'investigation was initiated by a re- quest from the Municipa'ity of Anchorage Department of Health and Environmental Proection to supplement the previous inves- tigation. Conclusions The permeability of the site soils appear to be adequate for on-site sewage disposal. Soil types encountered were fairly consistent with the previous 'nvestigation. A hign groundwater table does not appear to be a problem on the site. Groundwater was encountered only on Lot 12, Block 2 (T.H. A) and was likely a local perched condition over the silt layer. However, these test holes were gen- erally placed in higher ground; any gullies or Iow areas may have shallow groundwater and should be avoided. Also, is noted for having intermittent spring activ- rates this area ity; these should also be avoided if encountered. 3. The roi owing table gives the measured percolation I for' the subject lots. Melvin R. Ni~ Jmls BACHNER COMPAN?TM ~-'Septembe~ 3, 1981 Mr Karl Bachner Page 2 Block 1 Lot. PercolaLion Rate 3 (T.H. C) 5.5 minuLes/inch 4 less than 1.O minutes/:nch 7 (T.H. A) less than 1 g minuges/incn 5 (T.H. B) 2.g minutes/inch 6 3.8 mirutes/inch 9 10.0 minutes/inch 12 (T.N. B) 2.0 minutes/inch Discussion The test holes of this exploration were dri led on August 17 and 18, 1981, and were a inches in diameter and about 16 feet deep. The drilling was done using a Nodwell ~ounted, Mobile B-50 drill fitted with a hollow stem auger, owned and operated by Denali Dri I 'ng, Inc. The drilling was supervised and the test holes were logged by Mr. Terry Barber, geologist with Alaska Testlab. Grab samples were obtained at about 5-foot intervals, were visually classified, and were sea'ed in con- tainers for further testing. Laboratory testing consisted of grain size dis[r'bution analysis of selected samoles. The upper sol s at Ehis site are ~argely sands aha gravels with liLtle si t, and therefore have gooa percolation characteris- tics. However, some silt avers were encounterea on LOt Block 1 and LOt 12, Block 2. This silt should be avoiaec, if possible, in the construction of seepage fields. Systems placed near Test Hole C of L-3, B-I, and T.H.B., L-12, B-2, should encounter the more favorable conditions. The percolation test was performed by filling the test hole with water and allowing it to soak for 2~ hours. The hole was then refilled with water, and the drop in the water eve was monitored for one nour. The percolation rate isted in this report was computed from the last 10 minutes of the test and was obtained for a depth of 8 to 1~ feet in the test hole If you have any questions regarding our investigation, or if we may be of further service, please feel free to call. Very truly yours, DOWL Engineers Carl A. Bassler Geotechnical Engineer Approved by: Melvin R Nichols, P.E. Partner ~.'MUNICIPALtTy. OF ANCHoi~AGE '' ' ' '~ DEPT. OF FIE L.~ENVIRONME,. ALT/-/ & ,-//'~ OCT 2 '~ 1981 ECEIVED Test Hole A Lot 3, Block 1 W.O. ~D13370 Date: 8/17/81 Logged by; TB .?epth in Feet From To 0 2.0 2.0 6.0 6.0 10.0 10.0 15.0 Soi Description Brown Peat, (Pt) NFS. Grey-Brown Gravelly Sand, ('SP), trace silt, subrounded gravel, 3/4"% moist, aense F-2, Brown Gravelly Sand (SP-SM), trace silt, wet by 7' F-2, Brown Si ty~ Gravelly Sara, (SM), l"+, wet to sat., dense MUNICIPALITY OF ANCHORAGE DEPT, OF HEALTll & ENVIRONMENTAL PRGTECTION OCT 2 1 1981 RECEIVED Bottom of Test Hole: Frost Line: Free Water Level: 15.0 ft, none observed none observed Sa. No. Depth Type of Sample Unified I 5' G SP 2 10~ G SP-SM 3 15~ G SM Remarks: 1. Type of Sample¢ G:Grab, SPT = Standard Penetration, U = Undisturbed. 2. Dry Strength, N=None, L=Low, M=Medium, H=High. 3. Group refers to similar material, this study only. 4. Genera Information, see Sheel: 1. 5. Frost and Textural Classification, see Sheet 2. 6. Unified Classification, see Sheet 3. 6A-1 Test Hole B Lot 3, Block 1 w.O. ~D13370 Date: 8/17/81 Logged by: TB Depth in Feet F rom To Soil Description 0 0.5 0.5 6.0 6.0 10.0 Topsoil F-4, Brown Sandy Silt, (ML), saturated F-2, Brown Silty Gravelly Sand (SM); saturated Bottom of Test Hole: Frost Line: Free Water Level: 10.0 ft. none observed none observed Sa. Type of No. Depth Sample Unified 1 5~ G IVlL 2 10~ G SM Remarks: 1. Type of Sample, G=Grab, SPT = Standard Penetration, U = Undisturbed. 2. Dry Stren§th, N=None, L=Low, M=Medium, H=High. 3. Group refers to similar material, this study only. 4. Genera Information, see Sheet 1. 5. Frost and Textural Classification, see Sheet 2. 6. Unified Classification, see Sheet 3. 6A-2 Test Hole C Lot 3, Block W.O. ,D13370 DaLe; 8/17/81 Logged by: TB Depth in Feet From To 0 0.3 0.3 16.0 Soil Description Brown Peat, (Pt) F-l, Brown Silty Sandy Gravel, (GP-GM), 2"+, moist, dense Percolation rate : 3.5 minutes/inch Rate determined for a water level at 10'. Bottom of Test Hole: Frost Line: Free Water Level: 16.0 ft. none oOserved none observed Sa. Type of No. Depth Sample Unified I 5' G GP-GM 2 10' G GP-GM 3 15' G GP-GM Remarks: 1. Type of Sample, G=Grab, SPT = Standard Penetration, U = Undisturbed. 2. Dry Strength, '~=None, L=Low, M=Medium, H=High. 3. Group refers to similar material, this study only. 4. General In~'ormaLion, see Sheet 1. 5. Frost ano Textural Classification, see Sheet 2. Unified Classification, see Sheet 3. GA -3 Lot 4, Block I W.O. ~D13370 Date: 8/18/81 Logged by: TB Depth in Feet From To Soil Description 0 0.5 0.5 12.0 12.0 16.0 Topsoi NFS, Grey Gravelly Sand, (SP), Subrounded gravel, 1~"+, moist to wet, dense NFS, Grey fine-med Sand~ (SP), moist, reed dense Percolation rate = 1.0 minutes/inch Water quickly seeped out of hole. Bottom of Test Hole: Frost Line: Free Water Level: 16.0 ft. none observed none observed Sa. No... Depth I 5' 2 10I 3 161 Type of .. Sample. Unified G SP G SP G SP Remarks: 1. Type of Sample, G=Grab, SPT = Standard Penetration, U = Undisturbed. 2. Dry Strength, N=Nbne, L=Low, M=Medium, H=High. 3. Group refers ~o similar material, this study only. 4. General Information, see Sheet 1. 5. Frost and Textural Classification, see Sheet 2. 6. Unified Classif'icaLion, see Sheet 3. 6A-4 Test Hole A Lot 7, Block 1 W.O. ~D13370 DaLe: 8/17/81 Logged by: TB Depth in Feet From To 0 1.0 1.0 7.0 ' 7.0 16.0 Soil Descriptior Topsoil ~IFS/F-2, Brown Gravelly Sand, (SP-SM), trace silt, moist-wet, mea. dense NFS, Grey Gravelly Sand, (SW), moist-wet, med. dense Percolation rate : 1.0 minutes/inch Water quickly seeped out of hole. Bottom of Test Hole: Frost Line: Free Water Level: 16.0 ft. none observed none observed Sa, No. Depth Type of Sample Unified 5' G SP-SM 10' G SW 16' G SW Remarks: I Type of Sample, G=Grab, SPT = Standard Penetration, U = Undisturbed. 2. Dry Strength, N=None, L=Low, Nl=Medium, H=High. 3. Group refers to similar materia , this study only. 4. General nformation, -see Sheet 1. Frost and Textural Classification, see Sheet 2. Unified Classification, see Sheet 3. 6A'5 Test Hole B Lot 7, Block 1 W.O. ~D13370 Date: 8/17/81 Logged by: TB Depth in Feet From To 0 7.0 7.0 8.0 8.0 16.0 Soil Description F-l/F-2, Brown Silty Gravelly Sand lo Silty Sandy Gravelt (SM-GM)~ moist to wet, NFS, Brown fine-med Sand, (SP) NFS, Brown Sandy Gravel to Gravelly Sand, (GW-SW), trace silt, 2u+ Bottom of Test Hole: Frost Line: Free Water Level: 16.0 ft none observed none observed Sa. Type of No. Depth Sample Unified I 5' G SM-GM 2 10' G GW-SW 3 16' G GW-SW Remarks: 1. Type of Sample, G=Grab, SPT = Standard Penetration, U = Undisturbed. 2. Dry Strength, N=None, L=Low, M=Medium, H=High. 3. Group refers to similar material, this study only. 4. General Information, see Sheet 1. 5. Frost and Textural Classification, see Sheet 2. 6. Unified Classification, see Sheet 3. 6A-6 Lot 6, Block W.O. ~D13370 Date: 8/18/81 Logged by: TB Depth in Feet From To Soil Description 0 1.0 1.0 10.5 10.5 16.0 Topsoil F-l, Brown Silty Sandy Gravel, (GM), Subrounded gravel, 2"+, moist, dense F2, Brown Silty Gravelly Sand, (SM), Subrounded gravel, 2'~+, moist, dense Percolation rate = 3.8 minutes/inch Rate determined for a water level at 14'. Bottom of Test Hole: Frost Line: Free Water Level: t6.0 ft. none observed none observed MUNICDIPALITY OF ANCH E" EPT. OF HEALT O£AOE INVIRoNMENTA~ ~ H & L r,,~T£CTiON OCT 2 1981 RECEIVED Sa. Type of No. Depth Sample Unified 1 5' G GM 2 10~ G GM 3 16' G SM Remarks: 1. Type of Sample, G=Grab, SPT = Standard Penetration, U = Undisturbed. 2. Dry Strength, N=None, L=Low, M=Medium, H=High. 3. Group refers to similar material, this study only. 4. General In£ormaLion, see Sheet 1. 5. Frost and Textural Classification, see Sheet 2. 6. Unified Classifica[ion, see Sheet 3. 6A-7 Test Hole A Lot~3~l Block 2 Depth in Feet From To W.O. ~D13370 Date: 8/18/81 Logged by: TB Soil Description 0 1.0 1.0 3.5 3.5 8.0 8.0 14.0 Topsoil NFS/F~1, Brown Sandy Gravel, (GW-GM), Subnounded gravel, 2"+ NFS, Brown Gravelly Sand, (SP-SW) NFS, Brown Sandy Gravel, (GW), Subrounded gravel, 1~", moist, dense Bottom of Test Hole: Frost Line: Free Water Level: 14.0 ft. none observed none observed Sa. No, Depth I 5' 2 10~ RemarKs: 1. 3. 4. 5. 6. Type of Sample Unified G GW Type of Sample, G=Grab, SPT = Standara Penetration, U = Undisturbed. Dry StrengLh, N=None~ L=Low, fYI=Medium, H=High. Gnoup refers to similar material, this study only. General In[ormation, see Sheet 1. FrosL and TexLural ClassifJcaLion, see Sheet 2. tJnifiecJ Classification, see Sheet 3. GA-8 Test Hole B Lot 3, Block 2 W.O. ~D13370 Date: 8/18/81 Logged by: TB Depth in Feet From To 0 3.5 3.5 16.0 Soil Description F-4, Brown organic Silt, (OL), wet, soft F-l, Brown Silty Sandy Gravel, (GW-GM), Subrounded gravel, 2"+, moist, dense Percolation rate = 2.0 minutes/inch Rate determined for a water level at 8'. Bottom of Test Hole: Frost Line: Free Water Level: 16.0 ft. none observed none observed Sa. Type of No. Depth Sample Unified 1 5' G GW-GM 2 10' G GW-GI~ 3 161 G GW-GlVi Remarks: 1. Type of Sample, G=Grab, SPT = Standard Penetration, U = Undisturbed. 2. Dry Strength, N=None, L=Low, M=Medium, H:High. 3. Group refers to similar material, this study only. 4. General Information, see Sheet 1. 5. Frost and Textural Classification, see Sheet 2. 6. Unified Classification, see Sheet 3. 6A-9 Lot 9, Block 2 W.O. ,D13370 Date: .8/18/81 Logged by: TB Depth in Feet From To Sol Description 0 0.3 0.3 16.0 Topsoil NFS, Brown Gravelly Sand, (SP-SW), trace silt, Sub- rounded gravel, 2"+, moist, meo. dense Gravel increases with oepth Percolation rate = 10.0 minutes/inch Rate determined for a water level at 8'. Bottom of Test Hole: Frost Line: Free Water Level: 16.0 ft. none observed none observed Sa. Type of No. Depth Sample Unified I 5' G SP-SW 2 10' G SP-SW 3 16' G SP-SW Remarks: 1. 3. 4. 5. 6. Type of Sample, G=Grab~ SPT : Standard Penetration, U = Undisturbed. Dry Strength, N=N6ne, L=Low~ M=Medium~ H=High. Group refers to similar material, this study only. General Information, see SheeL 1. Frost and Textural Classification, see Sheet 2. Unified Classification, see Sheet 3. 6A-10 Test Hole A Lot 12, Block 2 W.O. ,D13370 Date: 8/18/81 Logged by: TB Depth in Feet From To 0 6.5 6.6 11.0 11.0 16.0 Soil Description F-2, Brown Silty .Sand, silt, moist-wet, med. dense, 2"+ F-2, Brown SiJty Gravelly Sand, gravel, 1"+ F-4, Brown Gravelly Sandy Silt, sat., firm, 1"+ (SM), fine-medium sand, 15-20% (SM), Subrounded (Mt), PL+, wet to Bottom of Test Hole: Frost Line: Free Water Level: 16.0 ft. none ooserved 11.0 ft. Sa. Type of No. Depth Sample · Unified I 5' G SM 2 10' G SM 3 16' G NIL Remarks: 1. Type of Sample, G=Grab, SPT = Standard Penetration, U = Undisturbed. 2. Dry Strength, N=None, L=Low, M=Medium, H=High. 3. Group refers to similar material, this study only. 4. General Information, see Sheet 1. 5. Frost and Textural Classification, see Sheet 2. 6. Unified Classification, see Sheet 3. 6A-11 Test Hole B Lot 12, Block 2 W.O. , D13370 Date: 8/18/81 Logged by: TB Depth in Feet From To 0 3.5 3.5 9.5 9.5 14.0 14.0 15.0 15.0 16.0 Soil Description F-4, Brown SancJy Silt, (ML) F-l, Brown Silty Sandy Gravel, (GM), Subrounded gravel, 1"+, moist-wet, dense NFS, Brown fine-medium Sand, (SW), well graded, moist, med. dense F-2, Brown Silty Sand, (SM) F-l, Brown Silty Sandy Gravel, (GM) Percolation rate = 2.0 minutes/inch Rate determined for a water level at 9'. Bottom of Test Hole: Frost Line: Free Water Level: 16.0 none observed none observed Sa. Type of No. Depth Sample Unified I 5' G GM 2 10' G SW 3 16' G GM Remarks: 6A-12 1. Type of Samole, G=Grab, SPT = Standard Penetration, U = Undisturbed. 2. Dry Strength, N=None, L=Low, M=Medium, H=High. 3. Grouo refers to similar material, Lhis study only. 4. General Information, see Sheet 1. 5. Frost and Textural ClassificaLion, see Sheet 2. 6. Unified Classification, see Sheet 3. ~gNIC o o o o >~ g g § o RECEIV~.D 8 o°I°'° o ~ L__.P. L A~_ L N_.. _LL~L I I Test Hole Lolll - Description Guide The logs often include the following items: Dcpt In errs[ -- usually shown to 0.1 foot, within that zone no ~xgnit'ica~i change in soil type was observed through drill action, d reft Frost Classification NFS, Fl, F2, F3, F4, see "Soil Classification Chart" Texture .I soil An engineering classification of the soils by particle LW, NP. M%or ddatency. J tqae clay-silt groups. Derived from drill action and/or sample data. Very soft, soft, stiff, very Stiff and hard are commonly used terms. 1-3/8", Shelby tube Y', auger flights (minute-man) 2", Auger flights (B-50 hollow stem} $"-8'. Larger particles are described ind~ectly by action of the drilling and are referred to as cobble*, 3" to 8", or boulders 8'+. Therefore whe. reviewing die gradation sheets, if any, the description on the hole log must be con,idered for an indication of. larger particles. Unified Soil Classification - This is a two letter code. See unified Classi{~ation sheet ~or further defiuition. In some case~ AASHO and/or FAA soil classifications may be shown a~ well a~ the unified. Atterberg Limits useful for fine grained and other plastic softs. PJ+; natural moisture content believed to be between plastic and liquid limits N~; non-plastic, useful as a modifying description of some silty s~rS~e%i or n,'~rly s;turated soil sample wbeu vibrated or johed - used Rock flour - finely ground soil that is not plastic but otherwise appears similar to a c.ayey silt. Organic Content - usually described as Peat, PT, sometimes includes discrete particles such as wood, coal. etc. as a modifier to an inorgamc soil. Quantity described as; trace, or an estimate of volume, or, in case of all organic, - as Peat. This may include tundra, muskeg and bog material. Muck - a modifier used to describe very soft, semi-organic deposits usually occuring below a peat deposit. Amorphus peat -- organic particles nearly or fully disintegrated. Fibrous Peat - organic particles more-or-less intact. Bottom of Tcsthole - includes last sam pie interval. Frost Line - seasonal frost depth as described by drilling action and/or samples at the time of drilling. Frozen Ground - other than frost line. described by samples, usually includes description of ice content, often will include moditied Unified Classification for frozen soils - this is a special case related to permafrost studies. Free ~/ater Level - The free water level noted during drilling. This is not necessarily the static water table at tbe tinge of drilling or at other seasons; Static water table determination ill other thau very perlneable soils requires observation wells or piezometer installations, used only in special cases. Blow/6' - The number of blows of a 140 weight free falling 30" to. advance a 2" split spoon 6"; the number of blows for a 12" advance is~ by definition, the standard penetration. M% - natural moisture content of the soil sample, usually not pe-~r ormed on clean sands or gravels below the water table. Type of Sample S__P, refers to 2" split spoon driven into file soil by 140 pound weight, a disturbed sample, S, thin wall tube, "Shelby" used to obtain undisturbed samples of fine grained soil, .Ct, "grab" disturbed sample from auger flights or wall of trench, .~, cut sample, undisturbed sample from wall of trench. Dry Strength - a useful indicator of a soil's clayey fraction, N'=-None, L=Low, M=Medium, H=Higb Group - The samplcsarc placed int. apparently simdar groups based SOIL TEXTURAL CLASSIFICATION CHART GRAVEL .30% CLAY \ CLAYE CLAYE'~ OR SILT GRAVEL GRAVELLY SAND GRAVEL 0 I0 20 30 40 50 60 70 80 90 GRAVEL (+ ~4 SCREEN) % BY WEIGHT I00 FROST CLASSIFICATION SYSTEM NONFROST SUSCEPTIBLE 501L5 ARE ~NORGANIC SOILS CONTAINING LES5 THAN 3% FINER THAN 0,02 mm, GROUPS OF FROST-SUSCEPTIBLE SOILS: F1 GRAVELLY SOILS CONTAINING BETWEEN 3 AND 20% FINER THAN 0.02 mm. F2 SANDY SOILS CONTAINING BETWEEN 3 AND 15% FINER THAN 0.02 mm. F3 a. GRAVELLY SOILS CONTAINING MORE THAN 20% FINER THAN 0.02 mm. AND SANDY SOILS · , (EXCEPT FINE SILTY, SANDS) CONTAINING MORE THAN 15% FINER THAN 0.02 mm. b. CLAYS WlTI-I PLASTICITY INDEXES OF MORE THAN 1.2. EXCEPT VARVED CLAYS. F4 a. ALL SILTS INCLUDING SANDY SILTS. b. FINE SILTY SANDS CONTAINING MORE THAN 15% FINER THAN 0.02 mm. c. LEAN CLAYS WITN PLASTICITY INDEXES OF LESS THAN 12. d. VARVED CLAMS. October 4, 1978 W.O. ~Dl1511 Grid a2043 Mr. Dick Rubio 733 W. 4th Avenue Anchorage, AK 99501 Subject: Subsurface Investigation for Suitability for On-Site Sewage Disposal Systems, Lots 1-23, Block 5, Stuckagain Manor Dear Mr. Rubio: As requested by Mr. Deane Lawrence of DOWL Engineers, we have performed a subsurface investigasion on the above referenced property. The data from that investigation is presented as follows: Conclusions Discussion Test Hole Location Sketch Figure 1 Test Hole Logs Table A Grain Size Distribution Curves Sheets 1-3 Standard Explanatory Information Sheets 4-6 CONCLUSIONS The permeability of the site soils on all 23 lots appears to be adequate, within Municipality of Anchorage Department of Public Health and Environmental Protection Regulation, to construct on-site sewage disposal systems. A high ground water table does not appear to be a problem on this sise. However, this area is noted for having intermittent spring activity. Such springs, if encountered, should be avoided when placing on-site sewage disposal systems. Also, any shallow gullies or low, poorly drained areas should be avoided as shallow ground water ]nay be found in these locations. This should be addressed when selecting the exact location for the o~]-s~te sewage disposal systems for each lot before construction. The fol]ow~)]g t.3b].e qives a~] estimated percolation rating fer each lot in the subdivision. Dick !ubio Octob~.r 4, 1978 Lot 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 Percolation Ratln~ 15.0 15.0 minut~,s less than 10 less than 5 less than 5 less than 8 less than 8 less than 8 minutes/inch /inch 0 minutes/inch 0 minutes/inch 0 minutes/inch 0 minutes/inch 0 minutes/inch 0 minutes/inch 2°0 minutes/inch /2.0 minutes/inch /}ess than 8.0 minutes/inch less than 8.0 minutes/inch less than 8.0 minutes/inch 5.0 minutes/inch 5.0 minutes/inch less than 5.0 minutes/inch less than 5.0 minutes/inch less than 5.0 minutes/inch less than 2.0 minutes/inch less than 2.0 minutes/inch less than 8.0 minutes/inch less than 10.0 minutes/inch less than 15.0 minutes/inch With the exceptions of Lots 1, 2, 9, 10, 14, and 15, the percolation rating given above was estimated based on extrapola- tion and interpretation of test hole data and the grain size distribution curves related back to similar soils in which percolation tests had been run. We are confident that the ratings listed are conservative. However, because of the conservative nature of the ratings, it may prove economic to actually run percolation tests on Lots ~, 2, 3, 11, 12, 13, 21, 22, and 23 because of the possibility of finding soils that are substantially better than the ratings estimated. However, it should be-remembered in all cases, even when a test hole is placed on every lot, that to extrapolate the data from s 9" diameter test hole out to a 50'-100' long absorption trench can present problems. Therefore, on every lot, even those with a specific percolation test, care should be taken to ~nspect ~he excavated absorption trench prior to backfill to verify that there is no substantial variance from the soil conditions observed in this report. DISCUSSION The drillinq was conducted on September 26, 1978 and consist-od ot: the plaeinq of nine t.e~;t hoists 16'--20' deep. The rest he, lc:; w, t', drillt,d tt~:ing ;I track mc)nnt~'d, MrM~ilc~ Drill B-50 Mr. Dick Ruble October 4~ 19?a. Pdrl b' 3 test holes were logqcd and the drilling supervised by Hr. Jim Mack, laboratory supervisor with Alaska Tcstlab. Solid flight, continuous auqcr was utilized. As the drill bit was raised to the surface, samples were taken directly off the bit at 5' intervals. Samples were then placed in sealed plastic bags and transported to the laboratory where their natural moisture content and dry strength were determined. Each sample was then visually classified with samples of similar color, texture and grazn size distribution being given an arbitrary group designation. Further laboratory analysis was then performed on composite samples from the group rather than on individual samples. A total of slx distinct soil groups were encountered and are described below: Group A is a brown Sandy ~ilt that is highly frost susceptible being rated F-4. Its unified classification is ML and its percolation characteristics are poor. It was a small group and contained only one sample out of test hole Group B is a brown Sandy Silt with a trace of Gravel that is highly frost susceptible being rated F-4. Its unified classification zs HL. Its percolation characteristics are poor though it was a small sample, the group consisting of only two samples out of test holes ~1 and ~2. Group C was a Gravelly Sandy Silt being highly frost susceptible being rated F-4. Its unified classifi- cation is ML and its percolation characteristics are poor. It consisted of only one sample out of test hole ~1. Group D ~roup E was a brown Silty Sand~ Gravel that is moderately frost susceptible being rated F-l. Its unified classification is GM and its gradation is shown on Sheen 1. Percolation characteristics of this material are good. This was the predominant soil found at the site. It was identified in every hole except ~csn hole ~1. is a brown Gravelly Sand that is non-frost susceptible bc'il~q rat'cd.x. .... ,. ].t~]nified classif.icatJon ]s SP ;llld ~ t!l {IF,1 l,/t ioI] 1 ~3 shown Ol1 Sheet 2. Its pcreol a- Lion characteristics arc cxccllent. is n 1)ro\.;n incdtum fl:~nd that is non-frost suscc ~l'ib]e beinq rat~,¢l NI'~i. lt:; qradat.ion is shown en fUn,et 3. Its m~ifi~,d classii ]cation i~; ~lP and it'~; p~,rcolaticm Mr. Dick Ruble Oct.~b~'r 4, 1978 Thou~h the purpose of this exploration was to look specifically at thc ~)erco]ation characteristics of the site soils with regard to th ~i.r suJt~bi].ity for construction of on-site sewage disposal systems, we would like to make a brief comment the [~ossible use of site soils as subbase material for road construction. There docs seem to be considerable moderately to non-frost susceptible soils on the site that should prove adequate for on-site construction. It may be necessary though, to do some additional exploration to further define potential borrow areas. We hope this report is sufficient to your present needs. If we may be of further service, please do not hesitane ~o cc n~act us. Very sincerely, ALASKA TESTLAB Melvin R. Nichols, P.E. Laboratory Manager MRN:rb Enclosures A T,'~ b I t. A we .,~I)t. 26, 1n ? rola '-PO 0.0' - 1.0' 1 °0' - 8.0' 8.0' 20.0' O~qaillC F-4, Si]t, NL, damp, Group A. F-4, Gravelly Si]t, ~L, wet, 20', Group B and C. cobbles 12' to Bottom of Test Hole: Frost Line: Free Water Level: 20.0' Remarks: None Observed None Observed Per,: Test !5 minute/inch Sample Depth 5.0' 2 10.0' 3 17.0' Type of Dry Blows/6" M% Sample Strenqth Group UnJ (Sod - 14.7 G L A - 17.6 G L B - I 1 . 7 G L-.~ C ,.'4L Remarks: 1. 3. 4. 5. 6. Type of Sample, G=Grab, SP Standar'd Penetration, U = Undisturbed. Dry Strength, N=None, L=Low, M=Ncdium, H=High. Group refers to simJ]ar material, this study only. Geueral ]nformatiou, see Sheet 1. Frost and Textural Classification, see Sheet 2. Unified C].assJfJcatJon, soo Sheet 3. Tcu;L llol c' ¥40 ",D1 )ql 1 Date': S(,[)L. 26, 0.0' - 5.0' 5.0' - 10.0' Soil D(,scr tpt ion Pc,at, wet, soft. I"-4, Silt, HL, wet. Bottom of Test llole: 10.0' Remarks: Frost Line: None Observed Free Water Level: None Observed Bole gully located in a small T,r~q,l~,d ~.,: J . SoJ ! D(,SC~ll)tlOll 0.0' 1.0' 1.0' 7.0' 7.0' 12.0' Orga'lJc overburden. F-l, brown Silty Sandv~ Gravel, (]~, damp, Group D. F-4, brown Sandy Silt, ML, damp to 10', wet, Group ~. 5hen 12.0' 20.0' F-4, brown Gravelly Silt, ML, wet. Bottom of Test Hole: 20.0' Remarks: Some water (6") snandinq on silt layer 7', t~erched. Frost Line: Free Water Level: None Observed None Observed Sample Depth 5.0' 2 8,0 Blows/6" Type of Dry Sample S_trenqth Grouo U_n_~ fj e_d_ G N D G L B I. Type of Sample, G=Grab, SP = Standard Penetration, U undisturbed · 2. Dry Strenqtb, N=None, L--Low, M=Medium, ll-:IlJqh. 3. Group re/'~rs to szmilar material, this study only. 4. General ]uforn]ation, see Sheet 1. 5. Fros~ aud Textural Classification, see Shoo5 2. 6. Un~[i,'d C]assiJ'icau/ou, see Shceu 3. Table' A we ItDI t',1 ] D,LLc: fk,i)k...'~r~, 1~ [){,Ill h itl l'~'~'l. 0.0' ].0' 3.0' 12.0' 12.0' 14.0' 14.0' ~6.0' Soil [),,serJl)t.lon F-1,/F-2, brov.'n Silty Sandy qraw~l, GM, ,_q_j~] t___v_ Gravel iv' ,ah'{n~I ,- ...... ' ........ -"' , S!l, wet to ~ damp to 3' NFS, grey Sand, SP, layered with a Sandy Gravel, GP, danlp, Group E. F-l, brown ~ilty Sandy Gravel, GM, damp, Group D. F-2, brown Gravelly Silty Sandy, SM, wet. Bottom of Test Hole: Frost L~ne: Free Water Level.: 16.0' None Observed None Observed Sample Depth 5.0' 2 8.0' 3 13.0' Type of Dry Blo;,:s/6" M% Sample Strength_ GrouP_ a.3 G N E 4.2 G N E 5.9 G N D Unf fi. ed SP SP G..'! Remarks: 1. 3. 4. 5. 6. Type of Sample, G=Grab, SP Standard Peneurat~on, U := undintnrbod. Dry Siren<lib, N=None, L=Low, ?~::bledium, II=HJq}l. Group ret. ers to szmzlar material, ti:ts study on],'. (;oncr~] TI]~OFIIWIIiJOII, SOO SI'leek I . Frost a~d Textural C]assificat].on, sce Sheet'. 2. UnifJod ClassilTiCnLJOn, see Si]ccc 3. Table A Dt ~Lh in 1',.. t. 0.0' 12.0' Soil D(,scrlption t'-1, brown Silty Sdn. l¥ Crnvel, GM, cobbles 7' to 12', ~roup ~. Bottom of Test Bole: Frost Line: Free Water Level: 12.0' Remarks: None Observed None Observed Perc. nest 5.0 rain/inch Sample Depth 1 5.0' Type of Dry Blows/6" ~!% ~ample Strength Group Unified 6.1 G N D Remarks: 2. 3. 4. 5. 6. Type of Sample, G=Grab, SP = Standard U = Undisturbed. Dry Strength, N=None, L=Low, M=Medium, Group refers to similar material, this General Infcrmation, see Sheet 1. Frost and Textural Classification, see Unified Classification, see SI~eet 3. Penetration, H=High. study onl. 5'. Sheet 2. ! d b 1 . A 0.0' 1.5' 1.5' ?.0' 7.0' 16.0' Soil D,,scrl')~ ~en Organic ovcnfburden. NfS, brown Sandy Gravel, GP/GM, F-l, brown Silt,, Sandy Gravel, 10'-16', Group D. damp. GM, cobbles Bottom of Test Ilole: Frost Line: Free Water Level: 16.0' None Observed None Observed Salnp].e Depth 1 5.0' 2 10.0' Type of Dry Blows/6" H% Sample _Strenoth~ GrouP_ 6.4 G N 11.1 G N D Unifi.,.~ Gl' Remarks: 1. 3. 4. 5. 6. Type of Sample, G=Grab, SP Standard Penetration, U = Undi-~;tur bed - Dry Strength, N=None, L=Low, M=Medium, It=llJ~h. Group re£ers to s~milar material, this study only. G~ncra] Information, see Sheet 1 . ['rosn and Texuural Classifica%:zon, soo Sheet 2. Unified Classification, see Sheet 3. T;Ibl t' A LO(Tq('d BV: J. r.~ack Date: S,,pt. 26, 197.q 0.0' 0.5' 0.5' 4.0' 4,0' 16.0' Bottom of Test Hole: Frost Line: Free Water Level: Soil Description Organic overburden. NFS, brown Sandy Gravel, GP, damp. F-l, brown ~ilty Sandy Gravel, Group D. 16.0' Remarks: None Observed None Observed Perc. damp, tes~ 2.0~in/inch ~ample D~E&~ 1 5.0' 2 10.0' Type of Drv " ho Sample Strength Grouo Unified Blows/6 '~ ........ 3.7 G N D 3.3 G N D G;.[ Remarks: 1. Type of Sample, G=Grab, SP = Standard Penetration, U undisturbed. Dry Strength, N=None, L=I.ow, H=Medium, II=High. Group roi-ers to similar material, chis study only. Genera] Informarion, see Sheet I. F~-ost and Tex[:ura] Classification, see Sheet 2. Unified Classification, see Sheer. 3. '1 c:;I lie ] ~' Tdl,l c A t',oocfud Bv: Date: J. tla c k 26, 1 [!/~I 0.0' 1 .0' 1.0' - 16.0' Soil Dcscr~)tion Oruan~c overburden, F-l, brown Silt. v Sandv Gravel, very dense [~elow ]-2.--0'-r, Group D. do r~p, Bottom of Test Hcle: Frost Line: Free Water Level: 16.0' None Observed None Observed ~ample Depth 1 5.0' 2 10.0' Type of Dry Blows/6'~ M% Sample Strenqth Group Unified 5.4 G N D GM 5.5 G N D GM Remarks: I . 3. 4. 5. 6. Type of Sample, G=Grab, SP Standard Penetration, U = Undisthrbed. Dry Strenoth, N=None, L=Low, M=Medi.um, H=tii~h. Group refers to similar'material, this study only. General Information, see Sheet Frost and Textural Classification, see Sheet 2. Unified Classification, see Sheet 3. q_',lb] e A WO riD1'5!1 l,om~(,(.I 1;7: J. Mm'l: Ddt(': ,%-'~,Dt-. 2~, 1~'i~! 0.0' 0.5' 0.5' 4.0' 4.0' 6.0' 6.0' 12.0' 12.0' 16.0' Soil Dc, scrit~t ion Organic overburden. F-l, brown ~ilty Sandy Gravel, GH, damp, Group D. NFS, brown Sand, SP, damp, Group F. NFS, brown Gravelly Sand, SP/SW) damp, Group E. F-l, brown ~il~y Sandy Gravel, GM, damp, Group D. Bottom of Test Itole: 16.0' Frost Line: None Observed Free Water Level: None Observed Type of Dry Sample Depth Blows/6" M% Sample Strength Group Unified I 5.0' 3.6 G lq F SP 2 10.0' 3.0 G N E SP 3 I 5.0 ' 3.3 G N D G."d Remarks: 1. Type of Sample, G=Grab, SP = Standard Penetration, U Undisrut-bcd. 2. Dry Strcn(~kh, N:-Hone, L=Low, M=Medium, H=l!igh. 3. Grou[~ rotors to s].mi].ar material, this study on]v. 4 . (]~'IICI'/]i [FfOl'lllatlOll, SOC ~;beo~ I . 5. I-'rot;t and 'ik'xruva] C/assifncation, see Sheet 2. 6. 'U~l'it,d Cla~:;i(icat:~en, s(,o Shecu 3.