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Home My WebLink AboutCHICKADEE SLOPES Tract B August 2, 1977 Mr. John Lynn Greater Anchorage Area Municipality Department of Health and Environmental Quality 825 L Street Anchorage, Alaska 99501 Dear Mr. Lynn: Re: On Site Sewage Disposal System: 40-acre Parcel, Tract B, Chickadee Slopes, Section 23, T12N R3W S.M. Alaska Yesterday there was an opportunity to review informally with Mr. Rolf Stri~klin the general soil test information from the above referenced parcel contained in the enclosed report. Several Anchorage residents are considering the group purchase of the property for the purpose of creating a sub-division. At a meeting of the group a decision was made to confer with the Anchorage Municipality Health Department immediately to determine what the requirements of the Municipality Health Department would be in order to approve the plat, when submitted later. At this time we would appreciate receiving from your Department responses to the following questions: Does ~the enclosed ConStruction Test Lab report furnish enough information in order for the Health Department to make a decision as to an affirmative recom- mendation as to lot sizes a~provab!e for the proposed sub-division? ~ and 1/4 acres) Based on the data contained within the enclosed report from Construction Test Lab does the tract qualify for lots sized at one-and-one-quarter acre throughout? If not throughout~ on what portion? What lot sizes would be approvable under soil conditions shown in the report? John Lynn -2- August 2, 1977 What additional information is needed in order for the proposed sub-division tract to be approvable by the Department of health? Are soil tests which "visual out" at 275 or higher percolating out at lesser values? If so, under those conditions, at what lower value would the platting of one- and-one-Quarter acre lots be approved by the Health Department? Do the soils involved appear to fall in such categories? In adjacent or nearby approved sub-divisions were visual tests of soil utilized and did they percolate at a lesser value than the visual tests would indicate? What lot sizes were approved for such sub-divisions? Please indicate which sub-divisions are adjacent, exemplify the above and their visual/per- colating soil classifications. Are percolation tests and/or other tests required in order to furnish additional needed information? If so, how many and in what general locations would they be required in order to give definitive data on which the Health Department's recommendation would be based? If the soil classification at a given depth (say from 3 feet to 9 feet) is considered unacceptable for on-site system but at an adjacent lower level (9 - 14 feet) acceptable material is found, are such conditions approvable? (See Test Hole Three) Mr. John Lynn -3- August 2, 1977 In summary, with the given information submitted and, in light of your resDonse to questions 1 through 7, is the tract approvable for on-site sewage disposal systems? If not, what additional steps would need to be taken to establish basis for aDDroval? If other factors are involved not covered in these questions submitted, we would appreciate very much your comments on such factors. Sincerely, Frederick McGinnis Enclosure, as indicated July 21, 1977 Gloria Bowman "ONE TEST IS WORTH A THOUSAND OPINIONS" 2204 CLEVELAND AVENUE · ANCHORAGE, ALASKA 99503 · 277-O231 1355 Crescent Avenue Anchorage, Alaska 99504 Re: 40 acre'parcel,' Tract B, Chickadee Slopes, in Section 23 T12N R3W S.M. Alaska Dear Gloria: At your reques% we have completed a preliminary subsurface soils investigation on your property and transmitted herewith are the results of the test boring data. The purpose of the test borings was to determine the soil types, ground water and bedrock conditions which occur to a depth of 16 feet on this 40 acre parcel of land. A total of nine (9) test borings were drilled as shown on the enclosed map. The test borings were drilled to a depth of 16 feet with a tracked 'mounted Mobile B-50 drill using continuous flight augers. Soil samples were generally obtained at 5 foot intervals. Laboratory analyses of the soil samples consisted of moisture contents and visual classifications. Discussion Surface Peat encountered at lower elevations were damp to Wet. The typical underlying soils encountered in this 40 acre tract consist of Sandy Silt (ML) and Silty Gravels (GP/GM). Drainage areas required for on-site sewage systems would generally range Gloria Bowman 40 acre parcel, Chickadee Slopes July 21, 1977 Page 2 from 150 to 300 square feet per bedroom in these sc~ils. ~round water was encountered in %est holes #7 and #8. No bedrock was encountered to a depth of 16 feet. A profile view was not included with this report due to the ir- regular terrain which would require a detailed topographic map. If you have any questions concerning this report, please contact our office. Very truly yours, CO?~STRUCTION TEST LAB . ,"' / David Paul Laboratory Manager DP/NAH/ss Approved: Neal A. Hausam, P.E., L.S. enclosures CONSTRUCTION TEST I~AB "One test is worth a thousand opinions" 2204 Cleveland -Anchorage, Alaska 99503 - 277-0231 Sheet------of Hole No. one W.O. No._____0perator DP .. Location See-enclosed mad Date 7/05/77 -- Client Glo~ia BowmaD . . . -- Top Elev.---~st~g Project 40 acres in Tract B, -- ---~Radee ~lopes }e mth CLASS IF ICAT ION S Ab~P LE .--eat SYSTEM DATA . LEGEND -- 1 ~ '1 I I1 ..'..i P sa t ~. / 2 oc 3 -./ce. GRAVEL 4 ~ Grab Sample 5 ~,~ Brown Sandy Silty Gravel, ~ -5 feet 6 with occasional cobbles Moisture = 9.6% 7 O / (GM ) SAND -/ 9 .0/, SILT 0 11 '~ - ' ~z~7 Hzt GraveZ 14 ~/o/c Silty Gravel (GM) 15 ~ o ORGANIC 16-- Bottom 6f Tes~ H6'le CONTENT 17 -- 18 No ground water or bedrock encountered . !9 - . PEAT 2~-- 22 -- FROST ~ 23 -- 25 WATER TABLE CONSTRUCTION TEST LAB "One test is worth a thousand opinions" 2204 Cleveland- Anchorage, Alaska 99503 - 277-0231 Hole No. Location Two See enclosed map Top' Elev Depth Feet i 2 3 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 2O 21 22 23 24 25 26 CLASSIFICATION SYSTEM Brown Silty Sandy Gravel (GP/GM) More Gravel Silty Gravel (GM) ~ore Silt Gravelly Silt (ML) Bottom of Test Hole No ground water or bedrock encountered. Sheet----of W.O. No. 0~ 7-5'L-id rator DP Date Giorla LBow~an Client_.____~ Project 40 acres in Tract B, -C~e~ ~'iOpes SA~LE DATA Grab 10' Hoisture = 9.1% LEGEND GRAVEL SAND SILT CLAY ORGANIC CONTENT PEAT FROST WATER TABLE CONSTRUCTION TEST i~AB "One test is worth a thousand opinions" 2204 Cleveland - Anchorage, Alaska 99503 - 277'0231 Three Sheet----- of ~ Hole No._ Location See enclosed map W.O. No.________Operato~ DP _ - ~ 7-5-77 Date Client Gloria Bowman _ Pro=ect 40 acres in Tract B~ Top Elev. Exist~n~ 3 -CThiCkadee Slopes ~epth CLASSIFICATION SAMPLE Feet SYSTEM ... DATA _ LEGEND - ! J_l 1 [' Peat 3 ? ~ / Brown Gravelly Silt "/ (ML) Grab 5' 4 ~ ~ Moisture = 6.7% GRAVEL 6 -p / SAND 11 ~ b~ Brown Sil%y Gravel (GM) Grab 10' .- Moisture = 7.9% 12-> ~ 13 ~ ~- , CLAY ~.,./ Brown sandy silt, damp ORGANIC !/'/- with occasional 3/8" pebbles.(MI) 16'~L.- .... CONTENT 17'~ Bottom of Test Hole 19-- No ground water or bedrock PEAT encounterd 21-- 22 ~ FROST 'I 23 24 ~- 25 ~- WATER TABLE CONSTRUCTION TEST LAB "One test is worth a thousand opinions" 2204 Cleveland - Anchorage, Alaska 99503 - 277-0231 Hole No. Location Four See enclosed mad =_ Top Elev. Ex i st_i_n~q Depth CLASSIFICATION Feet SYSTEM 1 Organic Content 3 4 5 6 7 8 9 10 11 12 13 14 15 164 17 18 19 20 21 22 23 24 25 26 Brown sandy silt with 3/8" pebbles & occasional ~obbles, ist. (MA) Brown sandy silty gravel, hoist. (GM) Sandy Silt (ML) Bottom of Test Hole No ground water or bedrock encountered. Sheet ----- of ~ DP W.O. No. _Operator ..... Date '~-5-77 Client G l__~_l~q_Bowm ~ n Project 40 acres in Tract B, ~-~ickadee Slopes SAMPLE DATA 5' Grab ~oisture = 14.3% LEGEND GRAVEL SAND SILT CLAY ORGANIC CONTENT PEAT FROST WATER TABLE CONSTRUCTION TEST LAB "One test is worth a thousand opinions" 2204 Cleveland - Anchorage, Alaska 99503 - 277-0231 Hole No. Location Five See enclosed map Top Elev. Existing Depth Feet 1 2 3 4 5 6 7 8 9 !0 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 CLASS IFICAT ION SYSTEM Peat, damp Grey sandy silt, wet, [th some 3/8" pebbles. (ML) Hit Gravel Bottom of Test Hole ground water or bedrock encountered. Sheet ---- of ~ DP W.O. No. 0perato~_ Date 7-5-77 Client Gloria Bowman ProjeCt40 acres in Tract B, ~hickadee Slopes S~4PLE DATA LEGEND GRAVEL SAND SILT CLAY ORGANIC CpNTENT PEAT FROST WATER TABLE CONSTRUCTION TEST i~AB "One test is worth a thousand opinions" 2204 Cleveland -Anchorage, Alaska 99503 - 277-0231 Hole No. Six Sheet----of Location See enclosed map _ W.O. No.______0perator DP Date 7 -5-77 __ Client Gloria Bowman _ --~~s in Tract B, Top Elev. E~istinq .. Project 5epth CLASS IF ICAT iON SA/4P L E Feet SYSTEM DATA 1 2 Peat, wet 3 4 5 -- 6 ./ , Brown sandy silt with ' / occasional gravel, (less than 7 --/ ./ 25%) (ML) ? , 10 .Z · /. Hit gravel ~z, Boulder Gravelly sandy silt "(ML) 15 ' ~ 16 ' ~' "- Bottom of Test Hole 17 18 No ground water or bedrock 19 ~- encountered. 21-- 22-- 23 24-- 26~_ LEGEND GRAVEL SAND SILT CLAY ORGANIC CONTENT PEAT FROST WATER TABLE CONSTRUCTION TEST LAB "One test is worth a thousand opinions" 2204 Cleveland - Anchorage, Alaska 99503 - 277-0231 Hole No. Location Seven See enclosed map Top Elev. Depth Feet 1 2 3 4 5 6 7 8 9 !0 11 12 14 .15 16 17 18 19 20 21 22 23 24 25 26 CLASSIFICATION SYSTEM Peat, wet Grey sandy silt with occasional 3/8" pebbles. (Mn) Grey sand, wet (SM) ~r level IBottom of test hole No bedrock encountered. Sheet ---- of ~ DP W.O. No. .Operator ..... Date 7-5-77 _ Client G__loria Bowman Projec~ acres in Tract B, Chickadee Slopes S~4PLE DATA Grab 5' Moisture = 15.0% LEGEND GRAVEL SAND SILT CLAY ORGANIC CONTENT PEAT FROST WATER TABLE CONSTRUCTION TEST !~raB "One test is ~'orth a thousand opinions" 2204 Cleveland -Anchorage, Alaska 99503 - 277-0231 Hole No. Location Eight See Enclosed map Top Elev. ~XlStlng Sheet- of ~ ~ W.O. No. _Operator DP 7-5-77 Date ,,, Client Gloria Bo%~man Pro4ect40 acres in Tract B, Chickadee Slopes Depth Feet 1 2 3 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 '26 CLASSIFiCAT ION SYSTEM · Peat, wet r '~ Bottom of test hole No bedrock encountered. S~PLE DATA LEGEND GP~AVEL SAND SILT CLAY ORGANIC CONTENT PEAT FROST WATER TABLE CONSTRUCTION TEST "One test is worth a thousand opinions" 2204 Cleveland -Anchorage, Alaska 99503 - 277-0231 Hole No. Location Nine See Enclosed map -~ v Existing Top ~±e .____~_---~ Sheet--of W.O. No. Operator' DP 7-5-77 Date Client Gloria Bo~man Project0 acres in Tract B, Chickadee Slopes Depth Feet 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 2O 21 22 23 24 25 26 CLASSIFICATION SYSTEM Brown silty gravel, moist (GM) Sandy silty gravel with occasional boulders (GM) Wet sandy silty gravel/silty sandy gravel. (GM) Bottom o~ test hole NO ground water or bedrock encountered. S~PLE DATA Grab 5' Moisture = 8.6% LEGEND GRAVEL SAND SILT CLAY ORGANIC CONTENT PEAT FROST WATER TABLE SOIL Typ'~-,. DI~P~3sfiL · ~ A/~k ML S TH8 ;;,?JM L '~ ~ M