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Home My WebLink AboutHIDEAWAY HILLS Block 1 Lots 11-13 CO. Russell Oyster 694-2774 Soils ~ Foundations GE Ji-ECHNICALDEVL -OPMENT Box 90, Davis St., Eagle River, Alaska 99577 694-2774 or 688-2280 June 12, 1977 PRELIbffNARY SOILS INVESTIGATION Lots ll, 12, & 15 Block 1 and Lots 1-6 Block Hideaway Hills Subdivision Anchorage, Alaska Earl ~lis 688-?780 Land Development Site Description: The eastern edge of Havitur Way (see Plate 1) lies approximately at the eastern toe of a north-south trending hill ~onsisting of dense silty, gravelly glaeial till. The area to the east is a poorly drained topographic low which over the distant past has filled with .decomposing organic plant material to form a peat deposit. The sur- face is covered with muskeg and scattered black spruce trees. The ground water table lies near the muskeg surface. In the recent past, fill material composed mainly of soil, brush, and trees obtained from clearing operations have been placed to make a relatively flat area over the lots to the east of Havitur l;ay. The thickness of the fill ranges from zero along Havitur Way to as much as 8 to 10 feet thick on the eastern edges of the northern lots. Site ~ploration: Three test pits were excavated at locations as shown on Plate 1. Iuogs of the test pits are included as Plates 2, 5, and 4. The original ground surface (at toe of fill material) along the easterm boundary of Lots i to 6, Block 5, and the boundary between Lots 1 and 2, Block 5~were probed wi~h a 5-foot long bar in an attempt to det- ermine the depth of mineral soil beneath the overlying muskeg and peat. ~o attempt was made to determine the subsurface condition~ on the southern sides of Lots 11, 12, and 15 of Block 1 or the northern and eastern sides of Lot I of Block 5. Findings: a. Test Pits: Mineral soil was found directly under the fill in Test Pits No. 1 and No. 2; the area had been cleared before placement of the fill. ~inera! soil was found directly under the muskeg surface in Test'Pit No. 5. There was no evidence of ground water in Test Pit No. 1; however, ground water stood at the original ground surface level in Test Pits 2, and ~. bo Probing: Mineral soil was found at or very near ground surface (1 to 2 feet deep) along a 100-foot length of the eastern side of Lot 6 and along the lot line separating Lots 1 & 2. Mineral soil could not be reached with the probe (4 to 4~ feet deep) along the eastern side of Lots 2,5,4, or 5. A thin layer of frozen peat was generally encountered and penetrated at about the 1 to 1½-foot depth. The top of another frozen zone or a fine-grained mineral soil was encountered in 2 or 5 locations at about the 5 to 4-foot depth. Conclus ions: 1. The contact (on the original ground surface) between mineral soil and peat lles generally between a line trendin~ through the test pits and the easters boundary, of the subdivision. Additional exploration would be required to further define the limits and depths of the peat deposit. 2. The ground water table is shallow, generally lying near the orig- inal ground surface under the fill. 5. The natural underlying granular glacial deposits found in the test pits are dense and strong and would provide good b_ear~g ~o 4. Consolidation of the peat under the fill with resultino~ settlement of the fill will continue at a decreasing rate (generally fractions of an inch per year) for years with the amount of settlement proportional to the thickness of the peat and the magnitude of the applied load.. 5. Consolidation of the fill material may also take place for a short time. The amount of settlement will be a function of initial fill density and eomDosltion and history of inundation and imposed load. Due to the many variables, no %eneral prediction can be made. 6. The existence of remnant frost or permafrost under a portion of the area is remotely possible. There is no conclusive evidence of perma- frost; however, it can exist in this ~eneral area and should always be a consideration in the evaluation of site explorations. '" J ? /~.o ; 2 5 7 Iz 0 /0 5 4 5 /Z 08-E L,u. Russell Oyster 694-2774 Soils ~t Foundations Perfo~ed for: GECL],ECHNI CAL tt Dk Box 90, Davis St.. Eagle River, Alaska 99577 694-2774 or 688-2280 SOIL L0~ T~ST P~T # 1 Ead EIIi~ Land Development Name: Clever Const~ction Co., Inc. Tel. No. 683-7149 Mailing Address: Rt. 5, Box 225B, Sequlm, Wa. 98382 Legal Description: North End Lot 12, Block l, Hideaway Hills Subd., Anchorage Depth (feet) foil Characterlsttcq 1; . 2 3 4 Fill Material -- ~fL - Silt with some organics and isolated rocks to 5 inch diameter. GM- Silty Gravel (Glacial Till) ~ottom of Pit 11 15 16 No X Ground Water Encountered: Yes__ )f yes, what depth__ Proposed Installation: Seepage Pit__ Drain Field. Comments: Location cleared and stripped prior to placement of £il]. Date: ~ June 8, 1977 --: ~.: : ~_'-/-'. Performed by: ,O~E uu. Russell Oyster 694.2774 Soils ~ Foundations . - 11--' IVil-- ~ I GEO~.CHNICAL ~- DFV~-L~.~ Box 90, Davis St., Eagle River, Alaska 99577 694-2774 or 688-2280 S0[rl. LOG.' TE~T PXT #~ Eerl Ellis 688-Z2.80 Lend Development Performed for: Name: C/emmet Construction Co. Inc. Tel. No. 683-7149 Mailing Address: Rt. 5, Box 225B, Sequim, Wa. 98582 Legal Description: West Eno Lots 4 a 5, Block 3, Hideaway Hills Subd., ~chorage Depth (feet)_ foil Characterlstic) Fill Material -- ML - Sil~ with some organics and isolated rocks to B inch diameterS slash - limbs and roots to 5½ inch.diameter. GM- Silty Gravel (GlaCial Till) 10 12 13 Ground Water Encountered: Yes x Proposed Installation: Seepage Pit__ __ No__ If yes, what depth 5 feet Drain Field Comments: ·-.Performed by: U LJ i- Ru~e# Oyster 694-2774 Soils b Foundations Performed for: ~"~Box 90, Davis St., Eagle River, Alaska 99577%''~ 694-2774 o~ 688-2280 LOG TEST PIT # 5 Ead Ellis 688-280 Land Dovelopmon! Name: Clemmer Construction Co., Inc. Tel. NO. 685-7149 Mailing Address: Rt. 5, Box 225B, Sequim, Wa. 98582 Lega~ Description: West End Lots I & 2, Block'X, Hideaway Hills Subd., Anchorage Depth (feet). Sol) Characterlstic~ Muskeg GM - Silty Gra_ve~l , (~G!a~i_~J_~_~_l~ ' ~ 6 8 9 10 . 15. Ground Water Encountered: Yes x Proposed Installation: Seepage Pit Co~ents: __ No__ If yes, what depth Drain Fte~d I½-foot Performed by: Earl P. Ellis ' '- Date: June 8, 1977