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HomeMy WebLinkAboutBASS #2 S-4039 Expired Plat ge DATE: TO: FROM' ~SUBJECT: icipality of Ancho, MEMORANDUM May 14, 1976 Planning Department Department of Health and Environmental Protection S-4039 BASS UNIT #2 true Environmental Sanitation will approve this application on the proposal of DOWL Engineers of May 13, 1976, copy attached, and with these conditions. Full engineering design of the package treatment plant end additional land ~ill to assure no sewage influence in surface waters on lots 1 and 3, due to the static water reading. We may bring this to the attention of the engineers ~q~.at these soils tests were made in December which does not give ~icture of the average water table. ital Specialist \ ANCHORAGE, ALASKA 99503 PHONE (907) 278-1551 ~.i~ay 1.3, 1976 W.O..Jr 8819 ~unicipality of Anchorage Department of Environmental Quality 2510 E. Tudor Road Anchorage, Alaska 99503 Attention: Rolf Strickland Subject: David Bass' Subdivision On-Site Water and Sewage Facilities Gentlemen: This letter is to inform you of the substance of our discussion with the owner on February 13, 1976. At this time the owner's attorney, Mr. A. Lee Peterson, reviewed the soils report and our recommendations and agreed that each lot should have a separate well and package treatment plants should be constructed on Lots · and 3 as shown in the sketch labeled Proposal A. To the best of our knowledge the owner intends to construct these facilities during the coming construction season. We propose to design the package treatment plants based on the soils information contained in the report dated December 30, 1975.o (A copy was previously sent to your office.) The size and location of these facilities will be based on current ~lunicipality standards and requirements. It is anticipated that a gravel fill will be required to provide a suitable drain field on Lot 1. We apologize for the delay in transmitting this information to you. We hope that you can proceed with approval of the subdivision as presented. Please advise if any additional information is needed. Very truly yours, WPH:pks Attachments cc: Mr. A. Lee Peterson 720 "M" Street Anchorage, Alaska 99501 DICKINSON-OSWALD-%fALCH-LEE, William P. Hamm, D.E. J PHONE ~unicipality of Anchorage Department of Environmental Quality 2510 E. Tudor Road Anchorage, Alaska 99503 1.3, 1976 W.O.!~8819 Attention: Rolf Strickland Subject: David Bass' Subdivision On-Site Water and Sewage Facilities Gentlemen: This letter is to inform you of the substance of our discussion wi'th the owner on February 13, 1976. At this time the owner's attorney, Mr. A. Lee Peterson, reviewed the soils report and our recommendations and agreed that each lot should have a separate well and package treatment plants should be constructed on Lots z and 3 as shown in the sketch labeled Proposal A. To the best of our knowledge the owner intends -to construct these facilities during the coming construction season. We propose to design the package treatment plants based on the soils information contained in the report dated December 30, 1975. (A copy was previously sent to your office.) The size and location of-these facilities will be based on current ~.!unicipality standards and requirements. It is anticipated that a gravel fill will be required to provide a suitable drain field on Lot 1. We apologize for the delay in transmitting this information to you. We hope that you can proceed with approval of the subdivision as presented. Please advise if any additional information is needed. Very truly yours, WPH:pks Attachments cc: Mr. A. Lee Peterson 720 'M" Street Anchorage, Alaska 99501 DICKINSON-OSWALD-%~ALCH-LEE, William P. Hamm, 'P.E. '1 TO DICKINSON-OSWALD-W/t* "H-LEE ENGINEERS 4040 "B" Street ANCHORAGE, ALASKA 99503 Phone (907) 278-1551 M/.;~ lc./ PEeP 7-- o~' Bo ATTENTION RE: GENTLEMEN: WE ARE SENDING YOU [] Shop drawings ,~ Copy of letter ,~Attached [] Under cover via separate [] Prints [] Plans [] Samples [] Change order [] the following items: [] Specifications COPIES DATE NO. DESCRIPTION THESE ARE TRANSMITTED as checked below: [] For approval [] For your use [] As requested yFor review and comment [] FOR BIDS DUE [] Approved as submitted [] Approved as noted [] Returned for cOrrections 19 [] Resubmit [] Submit [] Return copies for approval copies for distribution corrected prints __ [] PRINTS RETURNED AFTER LOAN TO US REMARKS ~ ~ /L~ -57". SIGNED: F01m240-T--Ilewi11~aedeusiressS~v]ce, h~.,TemlsaxI, Mass. If enclosures are no/ as noted, kindly notify us at once. 4040 ;'B" STREET, ANCHORAGE, ALASKA 99503 PHONE: 907-279-2581 December 30, 1975 W.O. 8819 Grid 2132 Mr. David Bass c/o ])OWL Engineers 4040 "B" Street Anchorage, AK 99503 .Subject: Subsurface Investigation for Suitabil.it~ of On-Site Sewerage, Bass Subdivision Dear Mr. Bass: Transmitted here~'~ are the results of %he above referenced investigation as performed by us on'D~cember 22 to 24, 1975. The project is located.on 7~th Avenue:near the Lake Otis Parkway, Anchorage, Alaska, and comprises Lot. 53 of Section Township 12 North, Seward ~eridian, A.laska. Included in this transmittal are: vicinity Map Test Hole Locahion'Sketch Test Hole Logs Explanatory Information Figure 1 Figure 2 Table A Sheets 1-3 The e×ploration was conducted with a truck mounted "Mobile Drill", model B-50 d]?i].l .]-~i9 wi. th a continuous flight,, so]id stem auger. The rig is' owned and ope.rated by Denali Dri]_ling Inc. The ~]rilling was supervised, the test ho'les logged, and the pcrcolotion tests run by Mr. Wallace Oliver, staff technician oY Alaska Testlab. The test ho'].es were 'pi. aced at the approximate ].ocat~qn on Figure 2. As samples ~]?om the hole were recovered, they were sea]ed in plastic bags to protec'h the sample and Mr. David Bass December 30, 1975 Page Two its natural moisture prior to being transported to the laboratory. Once in the laboratory, the moisture content and dry strength of each sample was determined. The log of the test holes is included as Table A of the report. In interpretting the logs it would be helpful to utilize the explanatory information contained in the back of this report. When drilling .was completed, a 3/4" slotted P.V.C. Pipe was inserted in each test hole to provide ~ conduit for measuring the water level. Test hole #1 was then 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. The above procedure is not a standardized percolation test, however, we understand the Anchorage Department of Environ- mental Quality prefers tests performed in.this manner to evaluate the site for a proposed on-site sewerage system. For test hole No. 1, the observed percolation rate was 20 minutes per inch. No water table was observed'during the drilling of test hole No. 1, but when the hole was left 'overnight to saturate, the water level seemed to stabilize at 6'. Due to the high water level, no percolation test was attempted on test hole No. 2. Approximately 24 hours after the hole was drilled, the static free water level was observed at approx. 4'. As the soils in hole No. 2 are similar to but slightly sandier than hole No. 1, the percolation rate of test hole No. 2 should be slightly faster than hole No. 1. The water level depths given should be used with caution as the water table normally fluctuates with precipitation and with the seasons. We hope this report meets your present needs. If we can be of further service please do~ not hesitate to contact us. Yours very truly, ALA S KA TE S TLA B RMH: mm · ' Approved: Laboratory Supervisor R. Mark Hansen Attachments .CAMPBEll AIRSTRIP THIS PROJ E C.'T' D3 i i Z O. 0 _J TABLE A Test Hole No. 1 WO#8819 Dec 22, 1975 Logger: W.O. Depth in Feet From To SOIL DESCRIPTION 0 6.5. F-4, Gravelly Sandy Silt, ML, gray, damp 6.5 10.0 .F-2, Silty Gravelly Sand, gray, damp 10.0 17.5 Bottom of Test Hole: Frost Line: Free Waterlevel: SA. NO. De_p_th M % 5.0 i7.5 F-4, Gravelly Sandy Silt, ML, gray damp. 17.5 ft. 0.0-2.5 ft. None observed while drilling. Type of .Dry Sample. Strength G M-L 2 10.0 10.0 G M 3 15.0 10.9 G M Remarks: 1) 2) 4) 5) Type of Sample, G=Grab, SP=Standard Penetration Dry Strength: N=None, L=Low, M=Medium, H=High General Information, see Sheet 1 Frost & Textural'Classification, see Sheet 2 Test Hole No. 2 TABLE A W0~8819 Dec 23, 1975 Logger: W.O. Depth in Feet From To 0 15.0 SOIL DESCRIPTION F-2, Silt~ Gravelly Sand, gray, wet @ 10' saturated @ 15' Bottom of Test Hole: Frost Line: Free Waterlevel: 15.0 ft. 0.0-2.0 ft. 10.0 ft. while drilling SA. NO. Depth M% 1 5.0 25.6. '2 10.0 11.0 3 15.0 Saturated Type of Dry Sample Strength. G L G L G -- Remarks: 2) 4) 5) Type of Sample, G=Grab, SP=Standard Penetration Dry Strength: N=None, L=Low, M=Medium, H=High General Information, see Sheet 1 Frost & Textural Classification, see Sheet 2 SOIL CLASSIFICATION CHART 30°~0 GRAVEL :laY CLAYEY CLAYEY ~. CLAYEY CLAYEY \ OR -" OR SILTY SILTY SILTY S I LTY __42 SAND GRAVEL GRAVELLY SAND SANDY GRAVEL SAND GRAVELLY SAND ~IDY GRAVEL GRAVEL \ o 0 10 20 30 40 50 b0 70 80 90 100 ,GRAVEL (+ .¢4 SCREEN) % BY WEIGHT NONFROST SUSCEPTIBLE SOILS ARE INORGANIC SOILS CONTAINING LESS TI-dAN 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 WITH PLASTICITY INDEXES OF MORE THAN 12. EXCEPT VARVED CLAYS. · F4 a. ALLSIL~'S INCLUDING SANDY SILTS. b. FINE SILTY SANDS CONTAINING MORE THAN 15% FINER THAN 0.02 mm. c. LEAN CLAYS WITIt PLASTICITY INL)EXES OF LESS TI-tAN 12. d. VARVED CLAYS. 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 following items: Depth Interval - usually shown to 0.1 foot, within that zone no significant change in soil type was observed through drill actiou, direct observation or sampling. Frost Classification - NFS, Fl, F2, F3, F4, see "Soil Classification Chart" Texture of Soil - An engineering classification of the soils by particle size and proportion, see "Soil Classification Chart", note the proportions are approximate and modifications to the soil group due to stratification, inclusions and changes in properties are included. Moisture Content - th!s is a qualitative measure: dry, 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, if a free draining soil; dilatent at natural 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 nbn-cohesive soils, such as sand gravel mixtures with or without a fine fraction, derived frown drilling action and/or sample data; usually described as: very loose, loose, medium dense, very dense. Gen'eral intent is to portray earthwork characteristics. Stiffness - refers to more-or-less cohesive soils and fine grained silts of the clay-silt 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 Y', auger flights (minute-man) 2", Auger flights (B-SO 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"+. Therefore when reviewing thc gradation sheets, if any, the description on the hole log inust be considered for ail indication of larger particles. Unified Soil Classification - This is a two letter code. See Unified Classification sheet for further definition. In some cases AASHO aud/or FAA soil classifications may be shown ;is well as the unified. Atterberg Limits- usefnl for fine grained and other plastic soils. P.~I; natural moisture content believed to be less than plastic limit PI+; natural moisture content believed to be between plastic aild liquid limits 1,._2w_4.; natural nloisture contcut believed to be greater than liquid limit NP; non-lilastic, u:;eful as ii modifying description of some silty materials. !)ils~t_.se_n_S~ -- is the ahility of water to migrate to tile surface of a saturaled or nearly saturated soil sample when vibrated orjolted -- used ',ts ill! aid to dclcrmine if a fine grained soil is a slightly or non-plastic silt or a volcan{c ash. Rock flour - finely ground soil 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 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. Muck - a modifier used to describe very soft, semi-organic deposits ~y occuring below a peat deposit. Amorphus pe~t - organic particles nearly or fully disintegrated. Fibrous Peat -- organic particles more-or-less intact. Bottom of Testhole - includes last sample interval. Frost Line - seasonal frost depth as described by drilliug 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 modified Uuifie~ 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 obserw~tion wells or piezometer installations, nsed only in special cases. Blow/6" - The numher of blows of a 140 weight free falling 30" to adwmce 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 uot. performed on clean sands or gravels below the water table. 'Type of Sample --- SI~, refers to 2" split spoon driven into the soil by 140 pound weight, a distm'bed sample, ~, thin wall tube, "Shelby" used to obtain undisturbed samples of fine grained soil, ~, "grab" disturbed sample from auger flights or wall of trench, ~, cut sample, undisturbed sample fi'om wall of trench. ~ry Strength - a nsefulindicator of a soil's clayey fi'action, N=None, L=Low, M =Medium, H=High Group .- The sa~nples are placed into apparently similar groups based on color and textnre an(t arc arbitrarily assigned a group letter, l':urther disturbed tests including Attcrbcrg Limits, grain size, moisturc..deusity relationshij), etc.. may be performed on thc group and are assumed to reflect thc geueral distruhed characteristics of thc soils assigned to thc grotlp. This is an imp(~rtant l)l~ase of the soil analysis and is used to standardize the varlotl5 qualilativc determinations and Io reduce thc number'of (]uantitalive tests ileoessilry to describe the .soil mass.