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HomeMy WebLinkAboutPROSPECT HEIGHTS J.M. Lambe & Associates SOIL AND MATERIALS ENGINEERING AND TESTING John M. Lambe, P.E. April 24, 1981 4101 Arctic Boulevard · Suite 205 ,, Anchorage, Alaska 99503 907-276-4113 Alaska Land Development Services, Inc. 4546 Business Park Blvd. Anchorage, Alaska 99503 Attention: Mr. Steven Brown Subject: Soils Investigation - Prospect Heights Subdivision Dear Mr. Brown, This letter presents the results of the soils investigation that we per- formed on the 70 acre parcel bounded by Kasilof Hills Subdivision, Prospect Heights Subdivision and Chugiak State Park..This work was performed in accor- dance with our proposal dated March 17, 1981. This report supercedes all pre- vious transmittals. In response to your request, nine borings were performed on the subject property. The borings were drilled by Denali Drilling, Inc. with a Nodwell mounted, Mobile B-50 drill fitted with 6" O.D. continuous flight auger. The borings were located by reference to the preliminary topographic information that you provided. The site is fairly steep and access, even with the Nodwell, was difficult. As directed, the borings were located where access allowed without damage to significant trees. The approximate locations of the borings are shown on the Boring Locati~on Sketch attached as Plate 1. The borings were logged by Mr. Roy McDonald, technician of our staff. Mr. McDonald's field logs were provided to you on April 24, 1981, as requested. Samples were taken in each boring at intervals of five feet by removing the auger from the boring then removing the sample.from the flights of the auger from near the bit. The samples were sealed in plastic bags and transported to our laboratory where the moisture content of each sample was determined. The samples were visually classified by a laboratory technician, then sorted into groups according to similarities in color and texture. Each group was assigned an arbitrary letter designation. Selected samples of the group were. analyzed for particle size distribution. The distribution of the samples within the groups and the schedule of particle size analyses are as follows: 1 I ! 1 1 GROUP A B C E F G "BORING 1 6 1 1 2 2 3 3 3 4 4 4 8 9 2 9 6 7 9 4 4 1 5 7 7 7 7 8 8 8 PROSPECT HEIGHTS DEPTH 5.0'* 7.0'* 10.0' 5.0' 7.0' 10.0' 15.0'* 6.0' 8.5' 5.0' 7.5' 3.0' 10.0'* 5.0' 7.0' 20.0' 5.0' 15.0' 20.0' 3.0' 10.0' 14.0' 2.5' 5.0' 3.0'* 5.0' 7.0' 10.0'* 7.5' 10.0'* 15.0' 20.0' 15.0' 3.0' 3.5'* 7,0' 10.0'* 15.0' 18.0' 5.0' 7.5' 10.0' page 2 Ak. Land Development Svcs. Prospect Heights CLASSIFICATION SILTY SANDY GRAVEL, GM SILTY SAND, SM SILTY SANDY GRAVEL, GM to SILTY GRAVELLY SAND, SM SILTY SAND, SM SILTY SAND, SM SILTY SAND, SM SILTY SAND, SM SILTY SAND, SM SILTY GRAVELLY ~AND, SM GROUP J *Particle Size BORING DEPTH i 13.0' 8 15.0' 8 20.0' 9 18.0'* Analyses Performed :~age 3 Ak. Land Development Services Prospect Heights CLASSIFICATION SILTY SAND, SM The field logs were modified by the laboratory analyses. The flights of the auger used by Denali Drilling, Inc. were worn smaller than the bit of the auger. This, coupled with the method of sampling, may not have returned all of the coarse fractions of the soil matrix to the surface for sampling and analysis. Consequently, the interpretation of the lab and field data is biased toward the field observations with regard to gravel content. Due to the glacial origin of the soils, cobbles and boulders can be expected to occur frequently throughout the area. The logs of the borings are presented as Plates 2 through 9. The results of the particle size analyses are presented on Plates 10 through 19. A1 field and laboratory classification were performed according to the Textural Classification System presented on Plate 20 and the Unified Soils Classi- fication System presented on Plate 21. In addition to logging and analyses of the soil types encountered in our exploration, percolation testing was performed adjacent to each boring in the seemingly most likely strata for the development of on-si~e sewer systems as dictated by soils, free water or bedrock. The percolation test procedure was to drill a shallow percolation test hole to the desired depth approximately five to ten feet away from the test boring, placing gravel in the bottom of the percolation hole then placing four inch perforated pipe in the hole. Gravel was then placed around the perforated pipe and the pipe was filled with water. The soils were allowed to saturate overnight then Mr. Mark Hall of our staff monitored the drop in the water level within the percolation hole over a period of one to four hours on the following day. Water was added to the percolation test as required to try to maintain six inches of water over the gravel in the bottom of the percolation hole. The results of Mr. Hall's percolation testing are attached as Plates 22 and 23. All borings were left open. When Mr. Mark Hall viewed each boring subsequent to drilling, observations to the depth of the free water level, if any, were re- corded. These data are presented on the boring logs and on the field percolation test results presented on Plates 23 and 23. The wording "no free water observed above 5'7"" means that the boring sloughed below 5'7" and the hole appeared dry. Page 4 Ak. Land Development Service~ Prospect Heights This subdivision is influenced by numerous factors. The soils were generally silty sandy gravel to silty sand. This agrees well with the Generalized Geologic Map prepared by Schmoll and Dobrovolny which maps the area generally as morainal deposits marking the margins of former glaciers. The east'boundary of the site is mapped as colluvium. With the exception of Borings 3,4 & 6, the remaining soils tested appeared to percolate. Locating these borings by survey methods and plotting them on the topographic map of the area may indicate a topographic, i.e. drainage:,related explanation for these boring's poor percolation rate. Free water was observed in Boring 1 at 5'5", Boring 8 at 7'10" and Boring 9 at 12'10". No free water was observed in the remaining borings during drilling or to the depth to which the boring remained open subsequent to drilling. It should be noted however, tha~t annually in response to seasonal run-off or he~rain~f_a~l~ The data presented on our logs is only intended to represent the level of the free water observed in the borings at the time of the observations. Shallow bedrock is assumed in Boring i at 11½ to 13' Boring 2 at 14½ to 15', Boring 5 a~.?~, Boring 7 at 18' and Boring 9 at 17'. However, the drilling often got very difficult above refusal to drilling at which depth competent bedrock was assumed. This difficult drilling is noted on the logs and may represent a weathered bedrock zone above the assumed depth of more competent rock. This report is intended to be a preliminary transmittal of the field observa- tions and soils analyses that were performed on the subject property. The scope of this effort was determined by discussing the project with Mr. Steve Brown of Alaska Land Development Services and Mr. Les Buchholz of the Department of Health and Environmental Protection (DHEP). As we discussed, the purpose of this in- vestigation was to provide preliminary data with which to assess the suitability of the property for subdivision and the development of on-site sewer systems and to define areas where additional analyses may be required. To this end, rigorous field percolation testing was performed. We trust the foregoing is sufficient to 'your immediate needs. While intended to be comprehensive, it may not be exhaustive of the possibilities. If questions arise or if we can be of further service, please feel free to call. Very Truly Yours, John M. Lambe, P.E. Civil Engineer 4254-E TEST HOLE LOCATION DIAGRAM PROSPECT HEIGHTS SUBDIVISION / T.H. 8 T.H. 2 N · PLATE TEST HOLES HOT LOCATED BY SUI~VEY METHODS TEST HOLE; LOCATION DIAGRAM PROSPECT HEIGHTS SUBDIVISION r.H.G T.H. 4 r.H. 9 -- ' .... ' PLATE HO{-£S NOT LOCATED 1 TEST BY SURVEY METHODS Laboratory Tesl~ Percolation Test 2.5 - 3.0' Sieve Analysis 14.6% - #200 H 27.2 A 13.6 Sieve Analysis 31.0% - #200 B 16.1 Percolation Test 5.5 - 6.0' B 9.9 10- J 15.2 D 11.8 C 8.6 5 C 5.9 15. LOG OF BORING 1 Equipment 6" O.D. CONTINUOUS FLIGHT AUG[ Elevation Exi~¢inq Grn~.Date .4/17/81 -- Brown, PEAT, PT wet Brown SILTY GRAVELLY SAND, SM wet Brown SILTY SANDY GRAVEL, GM wet, brown & dark brown mottling Black SILTY SAND, SM to SILTY GRAVELLY SAND, SM drills very stiff, may be weathered bedrock. REFUSAL @ 11.5,13.0 & 13.5' Assume Bedrock -- Grey GRAVELLY SANDY SILT, ML ........ ~,~ saturated, very dense drilling, may be weathered bedrock. TOTAL DEPTH OF BORING - 13.0' 7 Free Water Observed @ 5'5" on April 20, 1981 _LOG OF BORING 2 Equipment 6" O.D. CONTINUOUS FLIGHT AUGEF Elevation ExistinQ Grnd.Date 4/17/81 Brown SILT, ML w/fibrous organics, wet Seasonal Frost to 1.5' Brown SILTY SANDY GRAVEL, GM to SILTY GRAVELLY SAND, SM Sieve Analysis 33.9% - #200 D 6.1 10 D 5.5 REFUSAL @ 14.5 & 15.0' Assume Bedrock TOTAL DEPTH OF BORING - 15.0' No Free Water Observed, Boring Sloughed Below 10.0' JOHN M LAMBE P.E. LOG OF BORINGS i & 2 PLATE ALASKA LAND DEVELOPMENT SERVICES PROSPECT HEIGHTS SUBD. 2 ANCHORAGE, JobNo. 81-274.10 /kaf~: WEP Date 4/24/81 Loborofory Tests E LOG .OF BORING 3 Equipment 6" O.D.CONTINUOUS FLIGHTAUGE ElevotionExisting Grnd. Dote 4/17/81 Brown PEAT, PT Seasonal Frost to 1.0' Percolation Test 5.5 - 6.0' D 12.3 D 10.9 Brown SILTY SANDY GRAVEL, GM to SILTY GRAVELLY SAND, SM moist to wet C 6.5 Sieve Analysis 28.4% - #200 C 7.2 15_ D 9.3 30- JOHN M. LAtABE, P.E. 4C Brown SILTY GRAVELLY SAND, SM moist TOTAL DEPTH OF BORING -20.0' No Free Water Observed, Boring Sloughed Below 15.0' LOG OF BORING 3 ALASKA LAND DEVELOPMENT SERVI. CES PROSPECT HEIGHTS SUBD. ANCHORAGE~ ALASKA PLATE 3 ~No. 81-274.10 Appr:WEP Date 4/24/81 Percolation Test 4'10" to D 9.0 5'5" F 12.1 Sieve Analysis 41.6% - #200 F 12.1 LOG .OF BORING 4 Equipment 6" O.D.CONTINUOUS FLIGHT AUGEI ElevatlonExistinq Grnd. Date 4/~7/81 PEAT, PT 3rown SANDY SILT, ML saturated Seasonal Frost to 1.0' Brown SILTY GRAVELLY SAND, SM moist Brown, SILTY SAND,.SM to SANDY SILT, ML moist D 8.8 15. Brown SILTY GRAVELLY SAND, SM moist w/cobbles below 17.5' D 7.9 __ TOTAL DEPTH OF BORING - 20.0' NO Free Water Observed, Boring Sloughed Below 14.0' JOHN M. LAMBE, P.E. No. 81-274.10 At)pr: WEP .Date 4/24/81 LOG OF B ORING 4 A L A S-~ N ~'--~E ~ ~--S-~R V ICES PROSPECT HEIGHTS SUBD. ALASKA NCHORAGE? PLATE 4 La~ratory TesH ~ ~ Percolation Test 2.0 - 3.0' Sieve Analysis 37% - #200 H 26.4 C 7.4 C 7.0 LOG .OF BORING 5 Equipment 6" O.D.CONTINUOUS FLIGHT AUGE~ ElevatlonExistinq Grnd. Date 4/18/81 Brown PEAT, PT Brown SILTY SAND, SM wet Brown StTLY SANDY GRAVEL, GM w/frequent cobbles, moist --REFUSAL @ 9.5' & 9.8' Assume Bedrock No Free Water Observed, Boring Sloughed Below 5.5' JOHN M. LAtABE, Job No. 81-274.10 2/24/81 LOG OF BORING 5 ALASKA LAND DEVELOPMENT SERVICES PROSPECT HEIGHTS SUBD. iNCHORAGE, ALASKA PLATE 5 La~:x:)ro for y Tests Percolation Test 4.0-4.5' Sieve Analysis 42% - #200 A G G G G 11.1 8.7 10.1 11.1 8.8 10.2 15. LOG .OF BORING 6 Equipment6" O.D.CONTINUOUS FLIGHT AUGEi Elevati°nExisting Grnd.Date 4/18/81 Brown PEAT, PT Brown SILTY SANDY GRAVEL, GM moist Brown SILTY GRAVELLY SAND, SM moist Brown SILTY SAND, SM moist, w/gravelly layers Dark Brown GRAVELLY SANDY SILT, ML moist, very tight drilling, may be weathered bedYock TOTAL DEPTH OF BORING - 20.0~ No Free Water Observed, Boring Sloughed Below 15.0' 3~ JOHN M. LAMBE, Job No. ~1-274.10 Appr: WEP Date 4/24/81 LOG OF BORING 6 ALASICA LAND DEVELOPMENT SERVICES PROSPECT HEIGHTS SUBD. A~CHORAGE ALASKA PLATE 6 Laboratory Tests LOG .OF BORING 7 Equipment 6"0. D. CONTINUOUS FL [GHT AUGE.R ElevatlonExistinq Grnd. Date 4/18/81 Brown PEAT, PT Sieve Analysis 20% - #200 Percolation Test 2.5-5.0' E 13.3 C 8.7 I 3.4 Sieve Analysis 16.7% - #200 I 3.1 10. Brown SILTY SAND, SM moist BrOwn SILTY SANDY GRAVEL, GM to SILTY GRAVELLY SAND, SM w/ numerous cobbles Drilling becoming very tight w/less cobbles @ 10.0' I 4.3 15_ 7.4 Dark Brown SILTY GRAVELLY SAND, SM moist,very dense drilling @ 16.0' may be weathered bedrock. REFUSAL AT 18.0'. No Free Water Observed, Boring Sloughed Below 13.5' 3O- JOltN M. LAN BE, P.E. 40- LOG OF BORING 7 PLATE ALASKA LAND DEVELOPMENT SERVICES PROSPECT HEIGHTS SUBD.'=~r' Job No. 81-274.10 ANCHORAGE, ALASKA La~oratory Tests LOG .OF BORING 8 Equipment6" O.D.CONTINUOUS FLIGHT AUGEI ElevaHonExistinq Grnd. Date 4/18/81 PEAT, PT Percolation Test 1'5'!-2'10" D 21.0 I 4.3 I 5.3 5 Brown SILTY GRAVELLY SAND, moist to saturated SM I 4.9 10, Drilling tight below 11.0' J 16.4 15_ J(~o No J 15.1 30- JOHN M. LAMBE, EE. 81-274.10 Appr: WEP D~te 4O- 4/24/81 --TOTAL DEPTH OF BORING - 20.0' Free Water Observed @ 5.5' while drilling, 7!10' after drilling 4/21/81 LOG OF BORING8 PLATE ALASKA ALASKA LAND DEVELOPMENT SERVI.CES PROSPECT HEIGHTS SUBD. ~ ~aboratory Tes~ LOG .OF BORING 8 Equipment 6'~' O.D.CONTINUOUS FLIGHT AUG.EF Elevat~onExistina Grnd. Date 4/18/81 rown PEAT, PT Percolation Test 1'5'!-2'10" D 21.0 I 4.3 I 5.3 5 rown SILTY GRAVELLY SAN~ saturated I 4.9 10. Drilling tight.below 11.0' j 16.4 15- J 15.1 JOHN M. LAt BE, P.E. Job No.__81-274'i'0 __ TOTAL DEPTH OF BORING - 20.0' Free Water Observed @ 5.5' while drilling, 7~10' after drilling 4/21/81 30 ApDr: WEeP Date~ 'LOG OF BORING8 ALASKA LAND DEVELOPMENT SERVI.CES PROSPECT HEIGHTS SUBD. ALASKA PLATE 8 Laboratory Tests Percolation Test 4'5"-5.0 D 9.3 E 6.8 ~ LOG ,OF BORING 9 Equ;pment6. O.D.CONTINUOUS FLIGHT AUGE Elevati°nExistinq Grnd.Date 4/18/81 Brown PEAT, PT Brown SILTY SANDY GRAVEL, GM to SILTY GRAVELLY SAND, SM moist to wet C 9.5 D 6.7 Brown SILTY SAND, SM wet to saturated w/cobbles & boulders G 4.1 Sieve Analysis 30.4% - #200 J 14.0 15_ Boulder or Bedrock @ 17.0' Grey SILTY SAND, SM very dense drilling, may be weathered bedrock Free Water Observed @ 12'10" 4/22/81 JOHN M. LAN BE, P.E. 3c~oNo. fi1~774.10 Al:~r: WFP Date_4/24/81 LOG OF BORING 9 PLATE ALASKA LAND DEVELOPMENT SERVI. CES PROSPECT HEIGHTS SUBD. ANCHORAGE. ALASY~q y Tests D 9.3 Percolation Test 4'5"-5.0' E 6.8 C 9.5 D 6.7 LOG .OF BORING g Equipment6" O,D.CONTINUOUS FLIGHT AUGE ElevatlonExisting Grnd. Date 4/18/81 Brown PEAT, PT Brown SILTY SANDY GRA~ZF~GM to SILTY GRAVELLY SA~D, SM~ m~ist to_~t ~ Brown SILTY SAN , SD~ wet to saturated w/cobbles & boulders G 4.1 Sieve Analysis 30.4% - #200 J 14.0 15 20. 3O- 4~ JOHN M. LAMBE; P.E. JobNo R1 .~74.10 Appr: w_~5..P__ Date 4/24/81 Boulder or Bedrock @ 17.0' Grey SILTY SAND, SM very dense drilling, may be weathered bedrock Free Water Observed @ 12'10" 4/22/81 LOG OF BORING 9 Tv L6T YE VICES PROSPECT HEIGHTS .SUBD. ' ANCHORAGE? ALASKA PLATE U. S. Stondord Sieve Opening Size J U.S.Slandord Sieve Numbers I 'Hydrometer '*Jlltl ~ ~'rl~l ''11'111 '' "11II ""' I IIitl IIIII ,olllll G~AIN SIZ~ IN MIlLIMeTerS J ~RAVEL COARS* SAND COBBLES COARSE J FINE MEDIUM J FINE SILT OE CLAY SymbolSomple Source Classificotion BORING [, Samp3e ~ ~ 5.0' SILTY SANDY GRAVEL, GM PARTICLE SIZE ANALYSIS PLATE JOHN M. LAMBE P.E. , ALAS~ LAND DEVELOP~]ENT SERVICES ~No 81-274.10 Appr: WEP Date 4/24/81 ~NCHORAGE, ALASKA U. S. Stondord Sieve Opening Size I U.S.Stondard Sieve Numbers J 'Hydrometer """" """' ""Ill,Ill ,lll, ,,,,Ill . r/ llll ,,,,,, t 0.5 OI 005 OOI 000~ GR~IN SIZE IN MILLIMETERS COBBLES GRAVEL I SAND COARSE J FINE COARS~ MEDIUM 'J FINE SILT OR CLAY SymbolSomple Source Clossificolion BORING 1, Sample ~3 ~ 7.0' SILTY SAND, SM PARTICLE SIZE ANALYSIS PLATE JOHN -,v,. LA,BE P.E. ALAS~ LAND DEVELOPMENT SERVICES -- ~No. 81-274.10 Appr: WEP Date 4/24/81 ANCHORAGEPROSPECT, HEIGHTS SUBD. ALAS~ // U. S. Stondard Sieve Opening Size I U.S.Stondard Sieve Numbers J 'Hydrometer 'U~111~1111' ~i' ri I r ' ' ' 'l I' ' ' ' IIIIIII I Jllllll I ~1111111 I IIIIIII I IIIIII IIIIII I "'"" ' ~o111 III II1~11 I' II IIIIIIII IIII1~1 ~ II/I- ~o I I I ~ III IIIIIII IIIIlll I IIIIII I I~, IIIIII ~ IIIIIIII GRAIN SIZE IN MILLIMETERS COBBLES COARSE I FINE COARS~ MEDIUM ~ FINE SILT OR CLAY Symbol 5omple Source ¢lassificotion BORING 2, Sample ~4 ~ 10.0' SILTY SAND, SM PARTICLE SIZE ANALYSIS PLATE JOHN M. LAMBE P.E. ALAS~ LA~ ~[VELO~[~T S[~VZC[S 12 PROSPECT H[[GHTS SUBD. ~No. 81-274.]0 Appr:~EP Date 4/24/8~ ANCHORAGE~ ALA5~ U. S. Standard Sieve~. ~.Opening Size I U.S.Stondnrd Sieve Numbers I 'Hydrometer 4 3 2,./72,1 ~'4 i. Y2~8 4 810 16 2030405060 100 200270 0.~ O'l 005 OOI 0005 O001 GRAIN SIZE IN MILLIMETERS COBBLES COARSE I FINE COARSE~ MEDIUM j FINE SiLT OE CLAY Symbol Sample Source Classification BORING 3, Sample #4 @ 15.0' SILTY GRAVELLY SAND, SH PARTICLE SIZE ANALYSIS PLATE JOHN M. LAMBE P.E. ALAS~ LAND DEVELOPNENT SERVICES -- 13 ~No. 81-Z74.10 Appr: ~EP Date 4/24/81 , ANCHORAGE~ ALASKA 0.5 OI 005 001 0005 000 GRAIN SIZE IN MILLIMETERS SAND GRAVEL COARSE~ MEDIUM J FINE COBBLESI COARSE I F,NE t S,LT OR CLAY SymbolSomple Source CIossificolion BORING 4, Sample #3 @ 10.0' SILTY SAND, SM PARTICLE SIZE ANALYSIS PLATE JOHN A4. [AA4BE P.E. ALASKA LAND DEVELOPMENT SERVICES PROSPECT ,RIG,TS SUB°. 14 J(93No. B1-274.10 Appr: WFP Date 4/24/B1 _ ),NCHORAGE, ALASKA U. S. Sfondord Sieve Opening Size U.S.Stondord Sieve Numbers /00 ?00 ~'~0ydrOmetet ~llllll I Ill~l Illllll IIIIIIII ,o,,,,,, ,,,,,, ,,,,,,, IIIIIII1' IIIIIII I ~1 IIIIIII Illllill Illllll I IIII1~ IlIJiii' ~oll ,11~Jl I I~I '~ III IIIIIlll Ill GRAIN SIZE IN MILLIMETERS SAND GRAVEL ~COARS~ MEDIUM J FINE Symbol Somple Source Closslficotion BORING 5, Sample ~1 ~ 3.5' SILTY SAND, SM PARTICLE SIZE ANALYSIS PLATE JOHN ~. [A~E P.E. ALAS~ LAND DEVELOPMENT SERVICES PROSPECT HEIGHTS SUBD. ~No. 81-274.10 Ap~: WEP Date 4/24/81 ANCHO~GE, ALAS~ U S. Slondord Sieve Opening Size J U.S.Sfenderd Sieve Numbers I 'Hydrom~fer "'"" """ OOI 0005 GRAIN SIZE IN MILLIMETERS COBSL[S COARSE J FINE COARS~ ~[DIUM J F~N/ SILT OR CLAY Symbol Somple Source Clossification BOEING 6, Semp]e ~4 ~ ~0.0' SILTY SAND, SH PARTICLE SIZE ANALYSIS PLATE PROSPECT HEIGHTS SUBD. ~No. 81-274.10 Appr: WEP .Date 4/24/81 ANCHORAGE, ALAS~ U'S. StandardSieveOpeningSize J U.S.Sfandord SieYe Numbers I 'Hydromefer I0 16 2030405060 ~ 200270 ,o,,,,, ,,,,il II GRAIN SIZE IN MILLIMETERS COBBLES COARSE I FINE COARSE~ MEDIUM J FINE SILT 0,~ CLAY Symbol Somple Source Clossificolion BORING ?, Sample #! @ 3.0' SILTY SAND, SH PARTICLE SIZE ANALYSIS PLATE JOHN M. LAMBE P.E. ALASI~ LAND DEVELOPHENT SERVICES PROSPECT HEIGHTS SUBD. 17 Job No._81-274.10 Appr:WEP Date 4/24/81 ANCHORAGE,. ALASKA U. S. Standord Sieve Opening Size I U.S.Sfandord Sieve Numbers I 'Hydrometer 5 I 0.5 OI 005 001 0005 0~ GRAIN SIZE IN MILLIMETERS GRAVEL I SAND ]COARS~ MEDIUM I FINE COBBLESI COARSE , F,NE I SILT OR CLAY Symbol Somple Source Clossificollon BORING 7, Sample ~4 e 10.0' S[LTY GRAVELLY SAND, S~ PARTICLE SIZE ANALYSIS PLATE JOHN ~. lA'BE P.E. ALAS~ LAND DEVELOPHENT SERVICES ~0 mu PROSPECT HEIGHTS SU~D. ~No 81-274.10 Appr~EP Date4/24/81 ANCHORAGE, ALAS~ U. S. Stondard Sieve Opening Size J U.S.Sfandard Sieve Numbers I 'Hydrometer ~ I 0.5 OI 005 001 0005 0~1 G~AIN SIZE IN MILLIMETERS I GEAV[L COARS~ SAND 1 COBBLES COARSE J FINE M[DIUM J FINE SILT OR CLAY Symbol Somple Source Clossificalion BORING 9 ~ IS.O' SILTY SAND, SH PARTICLE SIZE ANALYSIS PLATE JOHN M. lAMBE RE. ALAS~ LAND D[VELOPH[NT SERVICES PROSPECT HEIGHTS SUBD. l= ~No, 81-274.10 Appr:WEP Date 4/24/81 ANCHORAGE~ ALAS~ John M. Lambe, P.E. 4101 Arctic Boulevard · Suite 205 · Anchoraee. Alaska99503_ SOIL CLASSIFICATION CHAR T OR \ OR\ CLAY SOIL AND MATERIALS ENGINEERING AND TESTING 907-276-4113 CLAYEY \ CLA3 'OR SAND SI LTY ~xGR 'GRAVELLY \ 20 30 40 50 60 70 80 90 GRAVEL (-ffl:4SCREEN) % BY WEIGHT CORPS OF ENGINEERS FROST DESIGN SOIL CLASSIFICATION AND USCS EQUIVALENT GROUPING' IuO F1 Gravelly soils 3 to 10 GW, GP. GW-GM, GP-GM F2 (a) Gravelly ~oil~ 10 Io 20 GM, GW~GM. GP-GM (b) Sands 3 to 15 SW. SP, SM. SW-SM, SP-SM ~ (a) Gravelly ~s ~20 GM, GC (b) Sands, except vc~ fine ~ 15 SM. ~ silty ~nfls ~ (c) Cla~.PI~ 12 ~ C~CH F4 (a) All sil~ -- M~ MH (b) Ve~ fine s~ty ~n~ ~15 SM PLATE (c) Clays, PI < 12 -- CL CL-ML ~ (d) Va~ cla~ a~ ~ CL ~nd ML; ZU ' other fine-g~in~, C~ M~ and SM; MAdOR DIVISIONS _...l TYFqCAL NAMES ~ ~ ~ILTS AND CLAY~ IN~GANIC C~ OF t~ ~ ~O]~ P~Cl~, UNIFIED SOIL CLASSIFICATION SYSTEM 320 (2600) 320 (2600) 2750 (2000) 470 2000 700 KEY TO TEST DATA dob No. JOHN M LAMBE P.E. Appr:__ Date SOIL CLASSIFI(~ATION CHART AND KEY TO TE~iT DATA PLATE 21 BORING DATE PERCOLATION TEST RESULTS TIME DEPTH TO WATER COMMENTS I 4/20/81 2 4/20/81 3 4/20/81 4 4/22/81 5 4/21/81 9:30 3~5¼" 9:33 21-¼" 11:56 35-¼" 12:03 20-½" 12:33 23;¼" 1:03 25" 1:33 28" Free Water Level 5'5" Test @ 2.5 - 3.0' Percolation hole dry after overnight saturation period Refill Percolation test 2-3/4" Drop/30 minutes 2-3/4" Drop/30 minutes 3" Drop/~s Percolation Rate -(~11 minut_~e~' 9:47 58" 12:18 72" 12:20 54-½" 12:47 63-½" 1:12 70" 1:14 56" 1:17 57" 1:47 66" 9' ¼" No Free Water Observed Above 9~ Test @ 5.5 - 6.0.' 10:04 64" 1:58 64" No Free Water Obse[ved Above Test@5'4" to 6'-5/8" 10:24 66~½'' 10:54 66-½" 11:24 66-½" No Free Water Observed Above 14'2" Test @ 4'10½" to 5'5" Added Water Added Water +9" Drop/30 minutes Percolation Rate - 3 minutes/inch Water in Percolation hole on arrival ~ No Apparent Drop Water in Percolation hole on arrival No Apparent Drop 3:30 18½" 4:00 25-1/8" 4:29 28" 4:30 16" 5:07 25-7/8" 5:30 28" 6:00 31" 6:30 33½" 7:00 35-3/4" 7:30 38" ~o Free Water Observed Above~'7" Test @ 2.0 - 3.0' Added Water 3" Drop/30 minutes 2½" Drop/30 minutes 2¼" Drop/30 minutes 2¼" Drop/30 minutes Percolation Rate_13 minutes/_in_~h PLATE · - 22 BORING DATE 4/21/81 PERCOLATION TEST RESULTS TIME DEPTH TO WATER COMMENTS 2:18 59½" 9 2:48 59½" 3:08 59½" No Free Water Observed Above 14'10" Test @ 4to4½' Below Surface No Apparent Drop 4/21/81 9:56 37 10:26 41-3/4" 10:56 46 10:58 33½" 11:56 43½" 11:58 33 12:56 41½" 1:26 45 1:56 48~' No Free Water Observed Above 13'4" Test @ 2.5 to 5.0' . Added Water Added Water 3½" Drop/30 minutes 3½" Drop/30 minutes Percolation Rate-9 minutes/inch 4/21/81 9:43 30-3/4" 10:t3 34½" 10:43 40½" 11:43 45½" 11:45 28 12:43 31 1:13 31-7/8" 1:43 32~" Free Water Observed @ 7'10" Test @ 1.5 Added Water 3" Drop/30 minutes 7/8" Drop/30 minutes* 3/8" Drop/30 minutes* Percolation Rate - 48 minutes/inch* to 2'10" Below Surface *Average Last Two Readings 4/22/81 9i00 47-3/4" 9:30 50" 10:00 51-3/4" 10:03 43" 12:00 54" 12:30 56-3/4" 1:00 58¼" Free Water Observed @ 12't0" Test @ 4'6" to 4'9z'' Added Water 2-3/4" Drop/30 minutes 1½' Drop/30 minutes Percolation Rate - 20 minutes/inch PLATE 23 \ \ \ ,g " t? r, /: · ,.-.