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HomeMy WebLinkAboutPROSPECT HEIGHTS Alaska Testlab March 29, W.O. 8956 Grid 2441 1976 S.J.L. Land & Oil Ventures c/o DOWL Engineers 4040 B Street Anchorage, AK 99503 Attention: Mr. Maurice P. Oswald Subject: Gentlemen: Subsurface Investigation, Prospect Heights Addition No. 3, Located within the NE 1/4, Sec. 13, Township 12 N, Range 3 W, Seward Meridian, Alaska In accordance with your instructions, a subsurface investiga- tion was performed on January 27 through January 29, 1976 for the Prospect Heights Subdivision Addition #3. The include the following: vicinity Map Test Hole Location Sketch Idealized SoilProfiles Grain Size Distribution Curves Test Holes Logs Explanatory Information Test Hole Logs (By Others) Figure 1 Figure 2 Figures 3-5 Sheets 1-3 Table A Appendix A Appendix B CONCLUSIONS 1) 2) Based on our experience, we believe individual on-site wastewater disposal systems are feasible for this site. Since all lots in this project will be larger than 1-1/4 acres, the limiting percolation rates presently required by the Anchorage Municipality Department of Environmental Quality are: a. less than 30 minutes/inch if septic tanks are to be used; b. less than 60 minutes/inch if package treatment plants are to be used. S.J.L. Land & Oil Ventures March 29, 1976 Page Two 3) Judging from the test hole logs, we believe percolation rates, as determined by our current testing methods will probably be: a. Less than 30 minutes/inch for test holes 1, 3, 4, 5., and 6; b. Less than 60 minutes/inch for test hole 2 and probably even less than 30 minutes/inch for test hole 2. Septic tanks and drain fields will probably be adequate for all lots in the subdivision, though, (depending on results of percolation tests performed'on individual lots after roads are constructed), package treatment plants may be required for a few lots in the area of Test Hole 2. DISCUSSION The exploration was conducted using a "Mobile Drill" model B-50 ~'-= .... : ...... ~ ~, = ~l~ve~a~-Nodwell tracked vehicle. The rig was equipped with a continuous flight solid stem auger. This equipment is owned and operated by Denali Drilling Inc. Mr. O.M. Hatch, geologist with Alaska Testlab, supervised the drilling and logged .test holes 3, 4, and 5. For test holes 1, 2, and 6, supervision and logging was done by Mr. Wallace Oliver, staff technician with Alaska Testlab. The approximate location of the test holes is shown on Figure 2. Table A is the logs of these test holes. As samples were recovered, they were sealed in plastic bags to protect the samples and retain the natural moisture prior to being transported to the laboratory. In the laboratory the samples were visually classified and the moisture content and dry strength determined. For easy reference samples of similar color, texture, and particle size distribution were given an arbitrary group designation. Additional laboratory analyses for grain size distribution were performed on a composite sample of each significant group. The compostion of individual samples can vary somewhat from that of the group as a whole. Three general soil types were encountered and are listed below by their group designation for reference to test holes. S.J.L. Land & Oi~ Ventures March 29, 1976 Page Three Group A is a brown gravelly sand with a trace of silt and also includes some brown silty gravelly sand. Frost susceptibility is sllghtto moderate wzth frost classification ranging from NFS to F-2. Unified classification is SP to SP/SM. This group was typically poorly graded, damp to saturated, had a medium to high density and was composed of subrounded particles. Although mechanical analysis of the composite Group A sample showed 13.5% fines (-#200), it is the writer's opinion that some of these samples were cleaner in their natural state and were mixed during drilling'. '.' ~ ~'~ · Group B is a brown silty gravelly ~and. It is moderately frost susceptible rated F-2. Unified classification is SP/SM to SM. This group was typcia].ly poorly graded, damp to wet, had medium to high density, and was composed of subrounded particles. Although the grain size distribution curves for Groups A and B are very similar, Group B was visually much siltier than Group A. is a ~xery ~v Qr~v~llV ~and. Individual. samples within this group include silty gravelly sands, (SM); gravelly sandy silts, (SM); and possibly sandy silts, (ML). However, frost classification ranges from F-2 to F-4. Particular attention should be called to the soil description in the test hole logs when they make mention of cobbles and boulders because these larger particles are not recovered by the auger and are detected by indirect means (drilling action). Thus, samples sent to the laboratory do not include any cobbles and boulders. In sandy gravel and gravelly sand soils, some of the larger gravel particles occasionally roll from the auger flights. "Grab" samples of these soils some- times contain more sand and less gravel than actually exist in place. Referring to the logs of test holes 3 and 6, the silty sandy gravel (GM), materials encountered in the field were classified as a silty gravelly sand (SM) in the labora- tory, but may be closer to a silty sandy gravel in the natural state. Additionally, there may be some contamination of samples. When a granular NFS soil is overlain'by silty materials, some of the siltier soil may be scraped from the wall of the test hole as the auger is raised. This can cause the laboratory sample to have a higher fines (-#200) content that actually exists in the field. For e~ample, test hole #5 of this project shows an NFS gravelly sand (S?) ~0i1 existing in the S.J.L. Land & 0i£ Ventures March 29, 1976 Page Four field at the 12'-15' depth. However', the samples recovered from the 12.5' and 15' depths in tes~ hole #5 were classified in the laboratory as a silty gravelly sand with a frost classification of F-2 and unified classification of SP/SM. This is probably due to contamination of the sample. For aid in interpretting the test hole 10ge, explanatory informa- tion is contained in Appendix A of this report. The soil gradations shown on the attached grain size distri- bution curve are for composite disturbed samples and do not reflect stratification which causes the soils to be more-or- less sorted in the field. Water levels were measured during drilling a~d approximately one week after drilling. The water levels given should .be used with caution as the water level may tend to fluctuate with percipitatlon and runoff as well as seasonally. Unseasonably warm weather during exploration, causing snowmelt, may have affected some of the water levels. Due to steep topography of the pro~ect site, P,~eer~0!atlo~/ t~ ~ lef~ la gash hole' to facilitate future percolation tests. Except at the test hole locations, the idealized soil profile.s (Fig. 3-Fig. 5) are only estimated. Wide variations between the soil profiles shown, and actual field conditions may and, in fact, probably do exist. Two of the test holes used for the profiles were dug and logged by others. Records of these holes were obtained from the Municipality of Anchorage Department of Environmental Quality. We trust the foregoing is sufficient and meets your present needs. Should questions arise or if we can be of further service, please feel free to contact us. Very truly yours, APPROVED: ALASKA TESTLAB R. Mark Hansen RMH: HRL: nuu ...,....,... Fig. I TEST HOLE LOCATION SCALE I =400 'C '1 I SK_TCH Fig. '2 S~DHiO XS Z o~ ...J b.I · ~- ..j ~ 0 =...z O"J o3 .f..9 £-'H '.L _ W 6-'H~ I-'H'.L g - 'H 'J. 9-'H'.L 0 O0 O~ o o o o 0 0 0 0 o Test Hole #1 Depth in Feet From To 0.0' - 0.8' 0.8' 10.0' 10.0' - 11.0' Table A  a0 #8956 Soil Description Peat and Roots F-2, slightly Silty Gravelly Sand,~P~S~ brown, poorly graded, damp, subrouf~' particles to 2". Boulders from 5.0' to 7.0' F-2, Silty Gravelly Sand,~M~ brown, poorly graded, satiated, subrou~l/ed particles to Bottom of Test Hole: Frost Line: Free Water Level: Sample Depth 1 5.0' 2 10.0' 11.0' while drilling after one week Type of Dry Blows/6" M% Sample Strength Group Unified -- 5.8 Grab N -- Sat. Grab A ' SP/SM B SM Remarks'. Type of Sample, G=Grab, SP = Standard Penetration. Dry Strength, N=None, L=Low, M=Medium, H=High. Group refers to similar material, this study only. · Test Hole #2 Depth in Feet From To 5.0' 10.0' 10.0t - 15.0' Bottom of Test Hole: Frost Line: Free Water Level: Sample Depth 1 5.0' 2 10.0' 3 15.0' Table A ~ Soil Des - Peat and Roots F-2, Silty Gravelly Sand~,~rown, poorly grade~,, ~casional co-~-~e~-~d boulders, damp. F-4, Gravell~ Sandy Silt, ML, brown, damp, subrounded particles to 2". F-4, Gravelly Silt, ML, brown, damp, sub- rounded-~--~c~-~-~'to 3". 15.0' ~3.0' None 14.5' Observed.during after one week drilling~I Type of Dry Blows/6" M% Sample Strength Group Unified -- 10.5 Grab N B SM -- 8.2 Grab N B SM -- 9.2 Grab L-N C ML Remarks:' 1. 2. 3. Type of Sample~ G=Grab, SP = Standard Penetration. Dry Strength, N=None, L=Low, M=Medium, H=High. Group refers to similar material, this study only. Test Hole #3 Depth in Feet From To 0.0' - 2.0' 2.0' - 4.0 4.0' - 8.0' 8.0' - 20.0' Bottom of Test Hole: Frost Line: Free Water Level: Table A WO #8956 Date: 1-28-76 Soil Description F-4, Sandy Silt with trace gravel, ML, brown, damp, stiff, NP. F-l, Silty Sand_~ Gravel, GM, brown, damp, medium to high density, subrounded particles to 3". F-2, very Silty Gravelly Sand, SM, brown, poorly graded, medium density, subrounded particles to 2". Silt content is 35%± at 5.0' and 15-20% at 7.5'. F-2, Silty Gravelly Sand, SM, brown, poorly graded, damp, medium density~ subrounded particles to 2". Silt content is 15-20% at 10.0', 25%+ at 12.5', 15%+ at 13.0', 15.0' and 20.0' /} None Observe/~' .... Sample 1 2 3 4 5 6 Depth 5.0 7.5 10.0 12.5 15.0 20.0 Type of Dry Blows/6" M% Sample Strength Group Unified -- 9.0 Grab N B SM -- 8.6 Grab N B SM -- 8.2 Grab N B SM -- 7.9 Grab N C SM -- 7.6 Grab N A SP/SM -- 8.7 Grab N A SP/SM Remarks: Type of Sample, G=Grab, SP = Standard Penetration. Dry Strength, N=None, L=Low, M=Medium, H=}/igh. Group refers to similar material, this study only. Test Hole #4 Table A WO #8956 Date: 1-28-76 Depth in Feet From To 0.0' - 1.5' 1.5' ~ .3.0' 3.0' - 8.0' 8.0' - 11.0' 11.0' 13.0' 13.0' - 20.0' Bottom of Test Hole: Frost Line: Free Water Level: Soil Description Peat, Pt, brown, damp, soft. F-4, Sandy Silt, M~, brown, damp, stiff, NP. F-2, Silty Gravelly Sand,%S~ brown, poorly gr ad ed-~-~mp, medium--~s~ty ,~ubrounded particles t~ 3". Silt con~nt ~%+ at 5.0', 15%+ at 7.5' (more gravel). ~ ~ F-2, very Silty Gravelly Sand,)SM,/brown, poorly grade~, damp, mediu--~nsi~y, sub- rounded particles to 1". ~lt ~ntent 35%+. F-2, Silty Gravelly Sand,/SM,/Wrown, poorly graded, damp, medium'-~~subrounded particles to 2"· Silt content 20%+. F-2, very Si_l. ty slightly Gravelly Sa~d,/sM, > poorly grad~d.d~ 'damp: ~ed~-~.y: ~ rounded particles to 1". Silt content 40%+_ at 15.0~,'20%+ at 17.0' to 20.~0~.~ 3.5' ~ None Observed Sample Depth 1 5.0' 2 7.5' 3 10.0' 4 12.5' 5 15.0' 6 20.0' Remarks: Type of Dry Blows/6" M% Sample Strength Group unified -- 9·0 Grab N A SM -- 8.1 Grab N C SM -- 9.8 Grab N C SM -- 8.0 Grab N C SM -- 10.5 Grab N C SM -- 9.4 Grab N B SM Type of Sample, G=Grab, SP = Standard Penetration. Dry Strength, N=None, L=Low, M=Medium, H=High. Group refers t6 similar material~ this study only.. 'Test Hole #5 Depth in Feet From To 0.0' - 1.5' 1.5' - 3.0' 3.0' - 6.0' 6.0' - 8.0' 8.0' - 12.0' 12.0' - 15.0' Table A WO #8956 Date: 1-28-76 Soil Description Peat, Pt, brown, damp, soft. F-4, Sandy Silt, ML, brown, damp, stiff, NP. F-4, Gravell~ Sandy Silt, ML, brown, damp, stiff, NP. F-2, Silty Gravelly Sand,~, brown, wet, mediu~ density, subrou--~e~artic]es to 2", probably wet from snowmelt. ~ /F~, s g~ , ali htly Silty very GravellmeYdi__~Sand, ~SP/SM, ~b~own~ poorl~--~aded, damp, ~%enslt~, subrounded particles to 2". NFS, slightly Gravelly ~and with trace silt, SP, brown, poorly graded, damp to saturated, medium to high density, subrounded particles to 1" Gravel not recovered in Sample #4. Bottom of Test Hole: Frost Line: Free Water Level: 15.0' 3.0' Saturated at 14~0' during drilling Sample Depth I 5.0' 2 7.5' 3 10.0' 4 12.5' 5 15.0' Remarks: 1. 2. 3. Type of Dry Blows/6" M% Sample Strengt~ Group Unified -- 16.9 Grab L-M C ML -- 13%7 Grab L-M C SM/ML -- 7.9 Grab N A SP/SM -- 4.4 Grab N A SP/SM -- Sat. .Grab -- A SP/SM Type of Sample, G=Grab, SP = Standard Penetration. Dry Strength, N=None, L=Low, M=Medium, H=High. Group refers to similar material, this study only. Test Hole #6 Depth in Feet From To 0.0' - 1.0' 1.0' - 7.5' 7.5' - 20.0' Bottom of Test Hole: Frost Line: Free Water Level: Sample D~p%h 1 5.0' 2 7.5' 3 10.0' 4 12.5' 5 15.0' 6 20.0' Table A WO #8956 Date: 1-29-76 Soil Description Peat, Pt, brown, damp, soft. F-l, slightly Silty Sandy Gravel, GP/GM, brown, poorly graded, occasional cobbles, damp, medium density, subrounded particles. NFS, Gravell~ Sand, SP, brown, poorly graded, fine sand, damp, medium density, subrounded particles to 1" Saturated at 17.5'. 20.0' 3.0' I17.5' 15.2' during drilling after o~e week~/ Biuws/6" Type of Dry 4.7 Grab 5.2 Grab 4.0 Grab 3.8 Grab 4.0 Grab Sat. Grab N A SP/SM N A SP/SM N A SP/SM N A SP/SM N A SP/SM -- B SM Remarks~ Type of Sample, G=Grab, SP = Standard Penetration. Dry Strength, N=None, L=Low, M=Medium, H=High. Group refers to similar material, this study only. APPENDIX A Test Hole Log -- Description Guide The soil descriptions shown on the logs are the best estimate of the soil's characteristics at the time of field examination and as such do not achieve the precision of a laboratory testing procedure. If the log includes soils samples, those samples receive an independent textural classification in the laboratory to verify the field examination. The logs often include the foEowing items: Depth interval - usually shown to 0.1 foot. within that zone no significant change in soil type was observed through drill action, direct observation or sampling. Frost Classification - NFS. FI, F2, F3, F4, see "Soft Classification Chart" Texture of Soil - An engineering classification of the soils by particle size and proportion, see "Soft Classification Chart", note the proportions arc approximate and modifications to the soft group due to stratification, inclusions and changes in properties are included. .Moisture Content - this is a qualitative measure: d_~_, no or little apparent surface moisture, damp, moisture forms portion of color, less than plastic limit, wet, no free water, often soft, if cohesive soil, saturated, free water may be squeezed out. ifa free draining soil; sand. {The moisture content is further definedby reference to PI, LW, NP, M% or d ftatency.} Density - refers to more-or-less non-cohesive soils, such as sand gravel mixtures with or without a fine fraction, derived from drilling action and/or sample data; usually described as: very loose, loose, medium characteristics. Stiffness - refers to more-or-less cohesive soils and fine grained silts of thc clay-sftt groups. Derived from drill action and/or sample data. Very soft, soft, stiff, very stiff and hard are commonly used terms. Particle size - The largest particle recovered by the split spoon is 1-3/8', Shelby tube 3". auger flights {minute-man) 2", Auger flights (B-50 hollow stemJ 6"-8". Larger particles are described indirectly by action of the drftling and are referred to as cobbles, 3" to 8", or boulders 8"+. Therefore when reviewing the gradation sheets, if any. the description on the hole log must be considered for an indication of larger particles. Unified Soil Classification - This is a two letter code, See Unified Classification sheet for fro-thor definition. In some cases AASHO and/or Atterberg Limits - useful for fine grained and other plastic soft$~ PI; natural moisture content believed to be less than plastic fimit PI+; natural moisture content believed to be between plastic and liquid N__P_; non-plastic, useful as a modifying description of some ~ilty materials. Dftatency - is thc ability of water to migrate to the surface ora saturated or nearly ~aturated soil sample when vibrated or jolt.ed - uged as an aid to determine ifa fine grained soil is a sligl~tly or non-plastic silt or a volcanic ash. Rock flour - finely ground soil that is not plastic but otherwise appears similar to a clayey silt. Organic Content - usually described as Peat. PT, sometimes includes discrete particl~ such as wood. coal, etc. as a modifier to an inorganic 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. ~uck - 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 Testhole - includes last sample interval. samples at the time of drilling. Frozen Ground - other than frost linc. described by samples, usually includes description of ice content, often will include modified Unified Classification for frozen soils - this is a special case related to Free Water Level - The free water level noted during drilling. This is not necessarily the static water table aG the time of drilling or at other soils requires observation wells or piezomcter installations, used only in B!ow/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. ,d% -- natural moisture content of the soil sample, usually not Type of Sample - s_P. refers GO 2" split spoon driven into the soil by 140 pound weight, a disturbed sample, _S, thin wall tube, "Shelby" used to obtain undisturbed samples of fine grained soil. G. "grab" disturbed sample from auger flights or wall of trench, C, cut sample, undisturbed sample from wall of trench. Dry Strength - a useful b]dicator of a soil's clayey fraction, N=None. L=Low. M=Medium, H=High G-oup - Thc sample~ are placed into apparently similar groups based disturbed tests including Attcrberg Limits. grain ~ize. moisture-density SOIL CLASSIFICATION CHART - 30% GRAVEL e~/ V ~V v v ,? v M x/~ v Xo 0 10 20 30 40 50 60 70 80 90 100 GRAVEL (+~4 SCREEN) % BY WEIGHT NONFROST SUSCEPTIBLE SOILS ARE INORGANIC SOI~S CONTAINING LESS THAN 3% FINER THAN 0,02 mm. GROUPS OF FROST-SUSCEPTIBLE SOILS: GRAVELLY SOILS CONTAINING BETWEEN 3 AND 20% FINER THAN 0.O2 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) CONTAININ~ MORE THAN I5% FINER THAN 0.02 mm. b. CLAYS WITH P[.ASTICITY INDEXES OF MORE THAN 12. 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 WITII PLASTICITY INDEXES OF LESS THAN ]2. d. VARVED CLAYS. APPENDIX B ENGLq,SERING. &, GEOLOGI© .' CONSULTANTS 229 ,-.. f 51s AVE - P O BOX 6087 - ANCHO'h...JE, ALASKA 99503 TELEPHONE 907--279-0483 TELEX 090--35419 · Geologists Land Surveyors ~'~,MES W. ROONEY, P. E. ~LCOLM A, MEN'-'ES, P E., L.S. JAMES Ho WE LL:;.^~',~, P.E. July 26, 1973 BECE*¥ED AU5 , 19t3 R &'I4 Project No. 36639 RALPH R. MIGLIACCIO Kincaid & Son Construction 7801 Jodphurst Anchorage, AK 99502 Re: Test Hole and Soil Log Report for Sanitary System Lot 14, Block 2, Prospect Heights Subdivision .. -Dear I,lr. Kincaid: We are submitting hereQith the test boring results and our comments regarding soil conditions encountered at the subject site. This investigation was performed in accordance.with your request of July 26, 1973, and those procedures outlingd in a letter dated September 13, 1971 by 5Ir. Rolf Strickland of the Greater Anchor~g~ Are~ Rorough Dep~rtment of Ep~7~rO~- mental Quality. A single test hole was put down within the Lot 14 area for the purpose of defining general subsurface soil conditions for the proposed sanitary system. Excavation was accomplished with a tractor-mounted backhoe and the test hole was extended to a total depth of 14.5 feet below ground surface. The final log prepared for the test hole has been included in Drawing A-01. Ground water was not encountered in the test hole. $~e appreciate being given this opportunity to be of service to you. Should you have any questions with regard to the above, please do not hesitate to contact us. Very truly yours, R & M ENGINEERING & GEOLOGICAL CONSULTANTS -?.,.,. ~Ja:~;e~ N. Rooney JI :R: ph zc: GAAB / ANCHORAGE FAIRRAL'KR .ItJNFAtJ T.H.- I 7 -26-73 SANDY SILT, WITH SO'ME SAND AND GRAVEL TRACE ORGANICS { SM) 2.0j GRAVELLY SAND WITH TRACE TO SOME SILT AND COBBLES (SP-GM Note Te.~! hole excavated Engineering ~o~ Geological Consultants 14.5' No Water Table T.D, with tractor mounted boc:~ho e. KincDid And Son Construction LOGS OF TEST BORINGS Anchorage Alaska gre/~?=? ANCHORAGE AREA BOf/~UGH DEPARTMENT OF ENVIRONMENTAL QUALITY SEWAGE DISPOSAL SYSTEM APPLICATION AND PERMIT P£;~IT No. LEG^LDESO.IPT,DN IH INSTALLATION OF~ SEPTIC TANK , TYPE AND SIZE OP F/~CIL1T~ TO BE S~:RVED ~O,L TEST .ESULTS COMPLETION DATE ANTICIPATED FINAL INSPECTION: ,~4 HOUR NOTICE REOUIRED. BACKFILLING OF' ANY SYSTEM WITHOUT FINAL.INSPECTION BY THE DEPARTMENT OF ENVIRONMENTAL QUALITY AUTHORITY WILL BE SUBJECT TO PROSECUTION, DIAGRAM OF SYSTEM . DRAIN FIELD ,/ __O .~ .... -- ~ MIN'IMUM DISTANCES, REQUIREMENTS TO NE^R;ST LOT 'W~L.L TO S~PTIC TANK ~,~ ~,~L~. /~0 ' ~$,TER MAIN TO SEPTIC T~NK /~ I ~EPTIC TANK, , / ~ SEEPAGE PiT TO RIVER. LAKE. STREAM. DR^'N P'£~-D /O ' ! · SEEP^GE P'* /OO ALSO CONSIDER AREA WELLS, SE~PAG~ PIT /'~ / DATE · I ~ APPLICANT'S SIGNATURE ~ / ~ ' _ .~'~-~/' ~'/~ ~ rO.M ~0. za-o,, ~/' ~ ABOVE "'I~.1"1~".~.~..''~ GREATER ANCIIOt~IR;I:i /',I~LA ~.~ 3330 "C" Street Anchorage, Alaska 99b03 ~OII,S IX)(;" Iq~IIOI,ATION "II,SI; "' ' ' . This form reports: Soils lo9 Percolation Cest Dep th Feet 1- 2- 3- 4- 5- 6- 9- 11- 1.3- Was ground water encountered? If yes, at whaC depth? Reading Date Gross.Time Net Time Depth to Water [let Urop Percolation rate minute. 'Proposed installa~Tb'n-:- ~-u~'ge Pit Drain Field ~;pth of Inlet . _ % Deptl)~'i~'t~J~-'l>it or trench . i ........ ~,,,,~ .,.. '--~:-~;,-, .... ~ ................ ~ ............ - .... Per f o m,g d J~y: ]~ ~/J.Z ._~_/_~<;?~ .~ert, fled By:. date: ......... EQ-04o DEPARTMENT OF E¢IVIRONMFt. I/AI. 011~I. ITY Ju.n 6 1974 /~/~t ~-~ 3330 "C" Street 'ANCIIORAGE, ALASKA 99503 . Performed For BobOrell ~l~e .ga I Description: Lot 3 Block 2 .his Form Reports Soils Log 'xx Soil Test Must Be Logged To 4' Depth Feet Soil Characteristics l- Peat, etc. 3-- 4-- 5-- 9-- 10'-- 11-- 12-- 13-- 14-- Light brown sandy silt with occasional coarse gravel Coarse gravel, coarse sand Grey sandy silt with cobbles and coarse gravel SP-GM GW ML-Gk Dark brown sandy silt with clay Coarse gravel and cobbles GW Was Ground Water Encountered? No If Yes, At What Depth? .Case t! Dated Performed'Junef 4, 1974 Subdivision F~ospec!_~_s-- Percolation Test Below Proposed Seepage System - Reading Date Gros )ss T~ime~/~e/ Depth to H20 Net DroF Percolation RaLe Minu,,, Proposed Installation: Seepage Pit XX Drain Field Depth of Inlet __ Depth to Bottom'-6-f-~Pit or Trenc~' ~OMMENTS: Based on Borough regulations, ~ve recommend 168 sq. ][~. per bedroom. 16' ~,t Performed BY,, lohn_n_n_n_n_n_n_n_n_q~amcson Date Certified BY: Date: " 8 GRe,"'/-":R ANCHORAGE AREA BOhP'"UGH ...... :-_ :' .'. DEPARTMENT OF ENVIRONMENTAl. QUALITY' PERMIT NO. 3330 '"C" STREET ANCHORAGE, ALASKA 99503 S£WA~ mS~OSAL sYs'r~ -- X.mcA-nON A.D .ERMrr PHONE INSTALLATION OF: SEPTIC TANK SEEPAGE PIT DRAIN FIELD OTHER d ~ /~-~,~ /t~o~. P · ~ .... ~' SEPTIC TANK ~ SEEPAGE PIT ~WE~L To S~PTIC TANK / 0 ~ / DRAIN fIELD /~//O *WA. TER ~AIN TO SEPTIC TAN~ D.^~N rIE'..o /0 / 2-0 / DRAIN FIELD / SEEPAGE PIT r~ ALSO CONSIDER AREA WELLS. ,, SEEPAGE PIT DRAIN EIELD /~-~1/ CAST lEON INTO AND OUT OF SEPTIC TANK AND INTO CRIB CROSSING GAP OF EXCAVATION 5 FEET INTO UNDI~.TURBED SOIL. GRAVEL BACKFILL DIAGRAM OF SYSTEM ID:::~:~:::~:;EA:Ii:::I:I:c~)7::;::~/iRT£::IATD[M:::E: OF GREATER~A,,~,~C-~H~;:m~AGE ~A~'--~' /] J/JREA BOROUGH ORDINANCE )iD. 28-60 AND THAT THE ABOV~ NElL ?~"~GHT BUILDING, PALME'R 745-4417 April i6, 1974 Mr. Earl J. Clabo P.O. Box 3-4056 Anchorage, Alaska 99501 Re: Soils Log Lot 8A Block S~ Prospect Heights Subdivision Dear Mr. Clabo: Transmitted herewith is the soils log for a test hole taken on the above referenced property per your request. It should be noted that the gravel thickness in the hole widened from three (3') feet on the north side of the hole to six (6') feet on the south side of hole. This would indicate that the gravel would increase in thickness in the location you propose to place the seepage pit. Verily Leo/Schebe'n Jr., P.E., Partner LS/m~ Enclosure "ORDON D, UNWIN~ P.E. LEO £CHEL~EN, JR., P.~.'- -- E.,1., ,C1.~' ~., Test' Itole TOP O~ HO~]~l--Lowest Sec~ton 'of LOt' S'O I E S L O G. '..'~,EST tiOLE NO. #1 ...... Ap fl ..... · . .... DATE r 16, 1974', · CLi'~(T PROJECT 4 7 11 '12 :7' · Black'Peat & Over Burden'-' .. '. · " '. :' . ,. ~Lj gi.l..~_r_own .D_a.L~g.n.~bl l t, {-lC - ~1~) . .. ....... . ..... :.'...:.. 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ROONEY, P. E. MALCOLM A. MENZIES, P.E,, L~. SAMES.H. WELLMAN, P.E. June 17, 1974 aut O 974 R & H No. 462040 Mr. Earl Clabo Clabo Construction Co. .P.O. Box 3-4056 Anshorage, Alaska 99501 Test Hole and Soil Log Report for Sanitary System Lot 8A Block 1 Prospect Heights Subdivision _ Dear Mr. Clabo: We are submitting herewith the test boring results and our co~nents regarding soil conditions encountered at the subject site. This in- vestigation was performed in accordance with your request of June 14, 1974, and those procedures outlined in a letter dated September 13, 1971 by ~. Roi~ StrickAand ot the Greater A~chorage A~ea ~orouga Oepaw~men~ of Environmental Quality. A single test hole was put down within the Lot 8A area for the purpose of defining general subsurface soil conditions for the proposed sanitary system. Excavation was accomplished with a tractor-mounted backhoe and the test hole was ~xtended .to a total depth of 14.0 feet b~low ground surface. The final log prepared for the test hole has been included in Drawing A-01. Ground water was not encountered in the test hole. During ~xcavatlon and logging of test hole, there was no indication of ground water below the immediate base of the test hole which was terminated at a depth of 14.0 feet. Since the soil was relatively dry, we do not feel that the water table is located ~thin the upper few feet below the test hole base or to a depth of 17.0 feet. We appreciate being given this opportunity to be of service to you. Should you have any questions with regard to the above, please do not hesitate to contact us. Very truly yours, R & M ENGINEERING & GEOLOGICAL CONSULTAI!TS, INC. James 'W, Rooney ~ ..... JWR:kd xc: CAAB TH-I 6-1t4-7h ORGANICS ORGANIC SILT 0o0~ ,0.$~ 2.0~ SILT, TRACE SAND SAND. SOME SILT, (SP) NOTE: SANDY GRAVEL W/SOME SILT AND COBBLES (SW-GM) NO WATER TABLE Test hole excavated with tractor mounted backhoe. Ih.O T.O. Engineering ~ Geological Consultants Inc. A.C.O.aO~ ~*,R~^.KS ALASKA PAUL BLOOH PROPERTY LOG OF TEST HOLE ANCHORAGE ALASKA - ~REATER ANCHORA,';E AREA BOROUGH [ .~x liEALTH DEPARTHENT f% CA~E' t] --- ~ 397 EAGLE STREET ANCHORAGE, ALASKA 99501 Zoc ' Th[s Fcrm Repo~s a: So~ls Log . , . .~'%r:o~o~on ~es~., , Jlas Ground Water Encountered? MO If Yes, At What Depth.. Location Sketch ReadingJ Bate Gross Time Net Time Depth To H20 Net Drop 'I / Frop~sed Instal~Seepage Pit ~'. Drain Field Depth Of Inlet Depth To Bottom Of Pit Or Trench coA)$ UZ.-rAt/J i