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HomeMy WebLinkAboutBIRCHWOOD WEST S-7364 [ON¥' /,N()WI i ,% MA Y( )1 ? DEP^RTMENT OF IlEAl 'IH ^i~}l) ENViRoNrdE~,I'£AL [~1~:) I ICi ION ,June; 20, 1984 M:l? ..Am Crawford I zaak Wa].ton League Sv~bject.: Birchwood West Indus'trJa! S/'D Dear Mr. Crawford: i have reviewed the documents on the above proposed sub- division. We had previously discussed impact, on your operation should this area be (!evelopod as residential. In that case a serious enforcement pr©bll.em could deveJ.op when residentia-% uses conflict wi th range uses. It now appears tha't industria.], zoning wJ].] occur. In this case the uses sNould be fairly compai:ib]_e. We hearti].y endorse a bufiering area between the I..wo ladd uses, pro-- vided .'Ll] is actually a noise abatement struchure and not just a stand of birch trees. This department will continue to oppose resident:ia), zoning next to your facility° Sincerely, Susan F,. Oswa]_f: Engineering Too~h. III SEO/aen MUNICIPALITY OF ANCHORAGE DEPARTMENT OF HEALTH & ENVIRONMENTAL PROTECTION Environmental Health Division CASE REVIEW WORKSHEET ¢'ASE NUM BE'R: S-7564A SUBDIVISION OR PROrjECT TITLE DATE RECEIVED May 3. 1984 COMMENTS DUE BY: June 1, 1984 Block 1, Block 2 and Tracts A, B Birchwood West Subdivision PUBLIC WATER AVAIEABLE COMMUNITY WATER AVAILABLE PUBLIC SEWER AVAII_ABI.E COMMENTS: 71~014 (Rev. 5/83) MUNICIPALITY OF ANCHORAGE DEPARTMENT OF HEALTH & ENVIRONMENTAL PROTECTION Environmental Health Division CASE REVIEW WORKSHEET CASE NUMBER: S 7564 SUBDIVISION OR PROJECT TITLE: Lots 1 - 18 Block 1 DATE RECEIVED: March 28. 1984 COMMENTS DUE BY: April 16, 1984 Lots 1 ~- 7 Block 2,. Tract A. B Birchwood West ( ~4~'~'I~'UBLIC WATER AVAILABLE (--) COMMUNITY WATER AVAILABLE (I&~'PUBLIC SEWER AVAILABLE 71-014(Rev. 5/83) DOWL Engineers Knakanen Corporation 3305 Arctic Boulevard Suite 200 Anchoraqe, Alaska 99503 Attention: Andrew H. Eker April 19, 1984 W.O. #D50967 Subject: 4040 "0" Street Anchorage, Alaska 99503 Telephone (907) 562-2000 Subsurface Investigation for Birchwood West Industrial Park, Located Within Sections 5 and 6, ]ownship 15N, Ranqe 1W, Seward Meridian, Alaska Gentlemen: lhis letter constitutes the results of our shallow subsurface soils investigat±on for the above mentioned project, lhe exploration was conducted to determine the near surface soil and groundwater conditions underlying the site. Included with this report is a test pit location map, test pit logs, grain size distribution curves and standard explanatory information. 1o accomplish this, six backhoe pits were excavated on April 3, 1984, utilizing a Mitsubishi MS120 backhoe provided by the client, lhe test pit locations, shown on Figure 1, were located by cloth tape from existing survey monuments. With- out the benefit of an accurate survey, the test pit locations should be considered approximate. In each test pit representative samples of each major soil horizon were taken, sealed in plastic bags to prevent mois- ture loss and transported to the laboratory where they were visually classified and mechanical analyses performed on representative samples. Upon completion of each test pit, a lenoth of ~/4-inch diame- ter perforated PVC pipe was placed in each pit to allow the monitoring of groundwater fluctuations with time. Similar soils were encountered in all six test pits. Beneath a thin layer of surface organics and forest litter, the site is mantled by about 2 feet of Red-Brown Silty Sand. lhe sand is frost susceptible with a trace of organic matter. Beneath the silts and extendinq to the depth of our exploration, the soil consists of well graded Sandy Gravel. lhe gravels are typically subrounded to rounded with a maximum size of knakanen Corporation April 19, 198d Page 2 approximately 10 inches. The gravels are very "clean" with only a trace of silt. The soils are damp and very dense. Mechanical analyses were performed on representative samples of the gravel, the results of which are shown on the attached grain size distribution curves. No groundwater was observed in any of the test pits during the short time they were open. No percolation tests were performed since the soils encoun- tered are classified as NFS, 6W and GP gravels. The gravels are expected to be quite permeable and should be suitable for on-site wastewater disposal systems. We hope this brief report is sufficient for your present needs. If you have any questions or if we can be of further service, please let us know. Sincerely, DOWL ENGINEERS 3ospeh Millhouse Geologist Approved: Melvin R. Nichols, P.E. Partner JM:MRN:kf Attachments ]est Pit #1 ]able A Date: 4/3/84 Logged by: JBH W.O. #D50967 Depth in Feet From To 0.0 0.5 0.5 2.25 2.25 15.5 Soil Description Surface Organics F2, Red-Rrown Silty gravelly Sand, damp, dense NFS, Olive Sandy gravel, 5" maximum sub- rounded to rounded gravels, fine to coarse sand, well graded, damp, dense 8' to 15' Slightly increasing silt, occa- sional cobbles to 8" Bottom of Test Pit: Frost Depth: Free Water Level: 15.5 Ft. 1.0 Ft. None observed during exploration. Sample ]ype of Number Depth M?~ Sample 1 4.0' 2.6 G 2 8.0' G Unified GW GW Remarks: 1. Type of Sample, G = Grab, SPl : Standard Penetration, U = Undisturbed. 2. General Information, see Sheet 1. Frost and lextural Classification, see Sheet 2. 4. Unified Classification, see Sheet 3. lest Pit #2 Table A Date: 4/~/8~ Logged by: 3BH W.O. #D50967 Depth in Feet From To 0.0 0.5 0.5 2.0 2.0 16.5 Soil Description Surface Orqanics F2, Red-Brown Silty Gravelly Sand with Organics, damp, dense NFS, Olive Sandy Gravel with cobbles to 6" maximum, fine to coarse sand, well graded, damp, dense Grades with trace silt below 8.5' Bottom of lest Pits: Frost Depth: Free Water Level: Remarks: 16.5 Ft. 0.5 Ft . None observed during exploration. 13.0' - 13.75' layer of NFS, Olive Grav- elly Sand Sample lype of Number Depth M% Sample Unified 1 5.0' G GW 2 9.0' - G GW-GM Remarks: 1. Type of Sample, G : Grab, SPl : Standard Penetration, II = Undisturbed. 2. General Information, see Sheet 1. Frost and lextural Classification, see Sheet 2. 4. Unified Classification, see Sheet 3. Test Pit #3 Table A Date: 4/3/84 Logged by: 3BM W.O. #D50967 Depth in Feet From To 0.0 0.5 0.5 2.0 2.0 15.5 Soil Description Surface Oroanics F2, Red-Brown Silty Gravelly Sand with Organics, damp, dense NFS, Olive Sandy Gravel with cobbies to 6" maximum, rounded gravel, fine to coarse sand, well graded, damp, very dense Grades to trace silt below 8' Bottom of Test Pit: Frost Depth: Free Water Level: 15.5 Ft. 0.5 Ft. None observed during exploration. Sample lype of Number Depth M,% Sample 1 6.0' 2.3 G 2 10.0' G Unified GW GW-GM Remarks: 1. Type of Sample, G = Grab, SPT = Standard Penetration, U = Undisturbed. 2. General Information, see Sheet 1. 3. Frost and Textural Classification, see Sheet 2. 4. Unified Classification, see Sheet 3. Test Pit #4 Table A Date: Logged by: 3BM W.O. #D50967 Depth in Feet From lo 0.0 0.5 0.5 2.0 2.0 15.0 Soil Description Surface Organics F2, Red-Brown Silty Sand with some 1" maxi- mum gravel and organics, damp, dense NFS, Brown Sandy Gravel with occasional subrounded to rounded cobbles to 6" maxi- mum, fine to coarse sand, well graded, damp, very dense Bottom of Test Pit: Frost Depth: Free Water Level: Remarks: 15.0 Ft. 0.5 Ft. None observed during exploration. Sides of pit cavinq below 10' Sample lype of Number Depth M% Sample 1 6.0' - G 2 13.0' - G Unified GW GW Remarks: 1. lype of Sample, G : Grab, SPI : Standard Penetration, U : Undisturbed. 2. Geoeral Information, see Sheet 1. 3. Frost and lextural Classification, see Sheet &. Unified Classification, see Sheet 3. Test Pit #5 ]able A Date: 4/3/84 Logged by: 3BM W.O. #D50967 Depth in Feet From 0.0 0.5 0.5 2.0 2.0 15.0 Soil Description Surface Organics F2, Red-Brown Silty Sand with some gravel and organics, damp, dense NFS, Olive Sandy Gravel with occasional subrounded to rounded cobbles to 6" maxi- mum, fine to coarse sand, well graded, damp, very dense Grades with trace of silt below 8' Bottom of Test Pit: Frost Depth: Free Water Level: 15.0 Ft. O. 75 Ft. None observed during exploration. Sample ~ype of Number Depth M% Sample 1 5.5' - G 2 12.0' - G Unified GW GP-GM Remarks: 1. ]ype of Sample, O = Grab, SPi = Standard Penetration, U = Undisturbed. 2. General Information, see Sheet 1. Frost and Textural Classification, see Sheet 2. 4. Unified Classification, see Sheet 3. lest Pit #6 lable A Date: 4/3/84 Logged by: 38H W,O, #D50967 Depth in Feet From To 0.0 0.5 0.5 2.25 2.25 15.0 Soil Description Surface Organics F2, Red-Brown Silty Gravelly Sand with Organics, damp, dense NFS, Olive Sandy Gravel with rounded cobbes to 8" maximum, poorly graded, medium to fine sand, damp, very dense Grades with trace silt below 9' Bottom of Test Pit: 15.0' Frost Depth: 1.0' Free Water Level: None observed during exploration. Remarks: 13' to 14' layer of F2, Brown Silty Sand, wet, dense Sample Type of Number Depth M% Sample Unified 1 4.5' - G GP 2 10.0' 2.4 G GP Remarks: 1. Type of Sample, G = Grab, SPT = Standard Penetration, U = Undisturbed. 2. General Information, see Sheet 1. 3. Frost and lextural Classification, see Sheet 2. 4. 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