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HomeMy WebLinkAboutREILLY LT 2A ,ER ANCHORAGE AREA BOk..UGH L,~ ":,; Department of Environmental Quality ~"~ 3330 C Street Anchorage, Alaska 99503 ~¢'~a 1"-5'~ECTION REPORT ON-SITE SEWAGE DISPOSAL SYSTEM NAME -. ~'~. Z-,~-tL.--'O~' MAILING ADDRESS /(-~/"~- ~,d. ~1 ~ PHONE LEGAL DESCRIPTION DISTAN~A~,E I ~j~. NUMBER OF FROM W~-~f. (~0 MANUFACTURER, __MATERIAL COMPARTMENTS "'~ INSIDE WIDTH INSIDE LENGTH LIQUID DEPTH LIQUID CAPACITY J~f_.)0GALLONS. TILE DRAIN FIELD:"-~-'.,tP¢c..~.J~ 4_ A~ DISTANCE F R OM AAtE--,L-d_ FOUNDATION NUMBER OF LINES DISTANCE BETWEEN LINES ABSORPTION AREA DEPTH: TOP OF TILE TO FINISH GRADE /~/~ TOTAL LENGTH NEAREST LOT LINE OF LINE4~ ~; ~ ~,TRENCH WIDTH /''~'- IN. TOTAL EFFECTIVE SQ. FT. LENGTH OF EACH LINE / DEPTH OF FILTER MATERIAL BENEATH TILE ~ ~. ABOVE TILE ~ IN. WELL: TYPE BUILDING FOUNDATION CESSPOOL APPROVED CONSTRUCTION DEPTH NEAREST NEAREST SEPTIC SEEPAGE , LOT LINE SEWER LINE , TANK SYSTEM OTHER SOURCES DISAPPROVED REMARKS DISTANCE FROM: DISTANCES: _ INSTALLED BY: ~'~ SEWER LINE DEPTH: PIPE MATERIAL' LOT SLOPE: REMARKS: Form EQ-O32 OF SYSTEM DATE ,-~ G.A.A.B.. !J::YI' % ]: :.i~E!: IF:II:RE 't"1.-It:!i: t....l~i:]'-,ICil'H [:, t MEN:E; I ON I Si; THE!: I .E!]'.,II]iTH ,:: I I",l FEE"I" ::, OF 'f'HEi: "Iq',~:EI'..ICH OFf. I:)Fi:F:I )i I.,IF I I:d.l:) 'i"Hii:: I')l:~i:[::"l'l.~ Ot::: I:::1 "I'F?.I!:{t'.,I(]I'4 l':)F~: PIT I]:il:;iLOI.JN[:, F:II'.,I[:, 'l]--I[~: [E:O'T'TOM OF: 'T'HIi~: TI-II!~]:RE: t?, I",10 ~-F;[~:'I' 14I[:,'i]d F'm]ll:;i: 'l't..lli:J []F~'.I::I',/I:~iL. [)l:~i]:::']-H I :~i; 'I'H[:{ M I I'.,I .[ MI..IM F:li.,J[::, 'l'Hl!!:: lii:I:]T'T'OM CIF 'l-FIl:~i: E',:.0]:I:::t',/t::ITtON ,::IN iii~l:::lC:l<i::'ItJ..II",t(:!i O1::' l:::ff',l"r' ::, =,Ih. il !.,.It'I"H()I..I]" F'Ilql::ll.... 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TI-II:::II",I :]: 4040 "B" STREET, ANCHORAGE, ALASKA 99503 PHONE: 907-279-2581 April 18, 1977 W.O. ~18008 Grid #2125 Ames Luce 1015 W. 7th Avenue Anchorage, AK 99501 Subject: Subsurface Investigation for Suitability of On-Site Sewer, Lot 2A, Reiley Subdivision Gentlemen: Transmitted herein in accordance with the instructions of Bill Thompson of Lounsbury & Associates, are the results of the above referenced investigation as performed by us on April 13, and 15, 1977. The scope of this projecu is investiga-- tion for suitability of an on-site sewerage system. Included J.n this transmittal are: Vicinity Map Test Hole Location Sketch Test Hole Log Explanatory Information Figure '1 Figure 2 Table A Sheets 1-3 The exploration was conducted using a truck mounted Mobile E-50 rig with continuous flight solid stem auger. The rig is owned and operated by Denali Drilling, Inc. Drilling was supervised, the test holes logged by Mr. O.M. Hatch, Geologist/ Senior Technician with Alaska Testlab. The log of the test hole is included as Table A of this report. In interpreting the log it would be helpful to utilize the explanatory information contaimed in Sheets 1 to 3 of this report. When drilling was completed a 3/4" slotted PVC pipe was inserted in the hole to aid in determining the free water level. For the percolation test, the test hole was filled with water and left overnight to saturate. On returning the next day, the hole was refilled with water and the drop in the water level carefully monitored over the next 60 minutes. This procedure is not a standardized percolation test, however, we understand that the Municipality of Anchorage, Department of Public Health and Environmental Prot, cction prefers tests performed in this manner to evaluate a site for' a prc!~osed, on-site sewerage system. Ames Luce April 18, 1977 Page 2 Using the above test, the observed minimum percolation rate was 3.3 minutes per inch. ~//z'W'~ In our experience, fine sandy soils such as encountered on this site plug up more easily than coarser soils. The observed percolation rate is very rapid, considering the soil types encountered in the test hole. For design purposes, we recon~end a more conservative value, 8.0 minutes per inch, or 135~sq. ft. per bedroom, be used to offset the tendency of the soil to clog. No water table was observed during drilling. It should be noted though, that the free water level normally fluctuates seasonally and with precipitation. We hope this report meets your present needs. If we can be of further service, please feel free to contact us. Sincerely, ALASKA TESTLAB R. Mark Hansen RMH:rb Enclosures 2~P~ROV~ED ~ ,~ ~ ~ h Melvin R. Nihho'l~, PE Laboratory Manager VICINITY MAP FIG. 1 5 f'6J I~.'M/?,I ea.'z,.. TEST H o L E Test Hole Table A WO #18008 Logged By: O.M. Hatch Date: 4-13-77 Depth in Feet From To Soil Description 0.0' - 18.0' F-2, brown very Silty Sand, SM, poorly graded, medium and fine grained, damp, medium density. Very silty at 10'. Less silt at 15' 18.0' - 20.0' F-4, brown Sand~ Silt, ML, damp, stiff, NP. Bottom of Test Hole: 20.0' Frost Line: 0.0'-1.0' Free Water Level: None Observed While Drilling Sample Depth Type of Dry Blows/6" M% Sample Strength Grou~ t 5.0' - - G 2 10.0' - - G 3 15.0' - - G 4 20.0' - - G Unified SM SM SM ML Remarks: 1. 3. 4. 5. 6. Type of Sample, G=Grab, SP = 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 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 examinatton. The logs often include the following items: Depth interval - usually shown to 0.1 foot, within that zone no significant change in soil type was observed through drill acti6n, direct observation or sampling. Frost Classification - NFS, Fl, F2, F3, F4, see "Soft Classification Chart" Texture ufSoil - An engineering classification of the soils by particle stze anti proporuon, see "Soil Classification Chart", note flte proportions are approximate and tin,dilatations to the soil group due to stratification, inclusions and changes m properties are included. Moisture Content this is a qualitative nleasure: dry, no or httle apparent surface moisture, damp, moisture forms portion of color,less than plastic limit, wet, ntl frec water, o(teu soft, ii' cohesive soil, saturated, free water may be squeezed out, ifa free draining soill dilatent at nat~al moisture content, if a non-plastic silt or fine sand. (The moisture content is further definedby reference to PI, LW, NP, M%or dilatency.) Density - refers to more-or-less non-cohesive soils, such as sand gravel mixtures with or wahout a fine fraction, derived from drilling action and/or sample data: usually described as: very loose, loose, medium dense, very dense. General intent is to portray earthwork characteristics. Stiffness - refers to more-or-less cobesive soils and fine grained silts of t'"~T' clay-sih 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-g0 hollow stem! 6"-8". Larger particles are described indirectly by action of the drilling and are referred to as cobbles, 3" to 8", or boulders 8"+. There(ore when reviewing the gradation sheets, if any, the description on the hole log must be considered for an indication of larger particles. Unified Soil C].tssification - This is a two letter code. See Unified ~{'ication sheet tor further definition. In some cases AASHO and/or FAA soil classifications may be shown a* well as the unified. Atterberg Limits useful for fine grained and other plastic soils. PI; natural moisture content believed to be less than plastic limit PI+; natural moisture content believed to be between plastic and liquid ITmit s L.__~; natural moisture content believed to be greater than liquid limit N._.~P; non-plastic, u~et'ul as a modifying description of some silty mat ~.tials. Dilatenc~_ - is the abdity of water to migrate to the surface of a saturated or nearly saturated soil sample wheu vtbrated or jolted -- used as an aid to d,:termme fl a fine grained soil ts a shghfly or non-plastic Sftt or a volcanic aS}l. Rock flour - finely ground soft that is not plastic but otherwise appears ~ clayey silt. Organic Content - usually described as Peat. PT, sometimes includes discrete particles such as wood, coal, etc. as a ~nodifier 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. 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 ofTesthole - includes last sample interval. Frost Line - seasonal frost depth as described by drilling action and/or samples at the time of drilling. Frozen Ground -otber than frost line, 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 permafrost studies. Free Water Level - The free water level noted during drilling. This is not necessarily the static water table at the time of drilling or at other seasons. Static water table determination in other than very permeable soils requires observation wells or piezometer installations, used only m special cases. Blow/6" - The number of blows ora 140 weight free falling 30" to advance a 2" split spoon 6"; the number of blows for a 12" advance is, by definition, thc standard penetration. M% - natural moisture content of the soil sample, usually not performed on clean sands or gravels below the water table. Type of Sample - S__P, refers to 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, C,,, "grab" disturbed sample from auger flights or wall of trench, .g., 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=High Group -- The samples are placed into apparently similar groups based on color and texture and are arbitrarily assigned a group letter. Furli~er disturbed tests including Atterberg Limits, gram size, moistureatensity relationsMp, etc. olay be performed on the group and are ,~ssumed to reflect the general distrubed characteristics of the soils assigned to the group. This ~s an important phase of the soil analysis and is u~ed to standardize file various qualitative detcrminat~ons and to reduce the number of quantitative te~ts necessary to describe the ~oiJ mass. SOIL CLASSIFICATION CHART CLAY 30% GRAVEL CLAYEY OR CLAYEY CLAYEY SILTY GRAVELLY SAND SILTY SAND SILTY SANDY GRAVEL CLAYEY SILTY GRAVEL SAND GRAVELLY SAND DY GRAVEL GRAVEL 0 10 20 30 40 50 60 70 80 90 100 GRAVEL (+#4 SCREEN) % BY WEIGHT NONFROST SUSCEPTIBLE SOILS ARE INORGANIC SOILS CONTAINING LESS 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 THAN0.02 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 WITH PLASTICITY 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 WITH PLASTICITY INDEXES OF LESS THAN 12. d. VARVED CLAYS.