Memorandum TO: CE 468 - Foundation Engineering FROM: Dr. Giovanni Bonita PE, PG SUBJECT: Individual Class Project DATE: April 3, 2018 DUE DATE: Monday April 30, 2018 SUBJECT: P-561 Prototype Aircraft Facility Your firm has been retained to provide a geotechnical engineering analysis and foundation recommendations for the above reference project. Included below is a brief outline of the project, proposed final grades, and column loads. The project is located at the Patuxent Naval Air Station located in Patuxent, Maryland. Currently the site consists of an open lot surrounded by active runways. The site will be cleared of any construction debris. The proposed Command Center will consist of a 4-story airplane hanger and associate taxiways and concrete aprons. Approximately 5 feet of new fill will be added to the site to reach a final grade of El +30.5 ft. A maximum settlement of 1.5 inches is allowed for the project. A site investigation was performed in 2014 by GEI Consultants, Inc. A representative test boring is included in Figure 1. Consolidation test results are included as Figure 2. Additional lab testing indicates that the average moist density of the insitu soils is 120 pcf. The water table is approximately 4 feet below the existing ground surface. The friction angle of the sands above the upper clay layer is 30 degrees and the friction angle below the upper clay layer is 34 degrees. The upper and lower clay layers have a drained friction angle of 24 degrees. Assume that the consolidation parameters for the upper clay apply to the lower clay. You are being asked to provide a geotechnical analysis of the subsurface conditions with respect to the following. a) Estimated allowable bearing pressure for a shallow foundation system placed 5 feet below the new ground surface. b) Typical footing sizes for a shallow foundation system. c) Estimated consolidation settlement of the clays. d) The feasibility of a shallow foundation system. e) If a shallow foundation system is not feasible, provide recommendations for the capacity, size, and length of a deep foundation system. Your report is due Monday April 30, 2018 at 5:10 pm. All work is to be done alone. Please do not hesitate to contact me at gbonita@geiconsultants.com for questions regarding your submission. FIGURE 1 BORING INFORMATION NORTHING: 222170.581 GROUND SURFACE EL. (ft): 25.47 DATE START/END: 9/11/2014 - 9/12/2014 VERT./HORIZ. DATUMS: / DRILLING COMPANY: TOTAL DEPTH (ft): DRILLER NAME: LOGGED BY: BORING EASTING: 1480008.7041 80.0 Veronica De Freitas GEI-2 Free State Drilling Joe S. RIG TYPE: CME 55 ATV PAGE 1 of 2 DRILLING INFORMATION HAMMER TYPE: AUGER I.D./O.D.: Automatic 3.5 inch / NA DRILLING METHOD: CASING I.D./O.D.: 4.25 inch/ NA CORE BARREL TYPE: DRILL ROD O.D.: 2 inch CORE BARREL I.D./O.D.: NA / NA Hollow Steam Auger and NQ2 WATER LEVEL ELEVATIONS (ft): Not measured Pen. = Penetration Length Rec. = Recovery Length RQD = Rock Quality Designation = Length of Sound Cores>4 in / Pen.,% WOR = Weight of Rods WOH = Weight of Hammer S = Split Spoon Sample C = Core Sample U = Undisturbed Sample SC = Sonic Core DP = Direct Push Sample HSA = Hollow-Stem Auger Sample Information Elev. Depth Sample Depth (ft) (ft) No. (ft) 20 5 10 _GEI WOBURN STD 6-NORTH-EAST-GRAPHIC LOG P-561.GPJ GEI DATA TEMPLATE 2013.GDT 10/17/14 10 15 20 0 25 30 Pen./ Rec. (in) Blows per 6 in. or RQD S-1 1 to 2.5 18/16 5-5-7 S-2 3.5 to 5 18/8 1-2-5 S-3 8.5 to 10 18/0 WOHWOHWOH S-4 13.5 to 15 18/18 1-WOH1 S-5 18.5 to 20 20 to 22 18/18 24/24 WOHWOHWOH S-6 23.5 to 25 18/18 4-6-13 S-7 28.5 to 30 18/18 1-3-4 U-2 Drilling Remarks/ Field Test Data Qp = Pocket Penetrometer Strength NA, NM = Not Applicable, Not Measured Sv = Pocket Torvane Shear Strength Blows per 6 in.: 140-lb hammer falling LL = Liquid Limit 30 inches to drive a 2-inch-O.D. PI = Plasticity Index split spoon sampler. PID = Photoionization Detector I.D./O.D. = Inside Diameter/Outside Diameter Graphic Log ABBREVIATIONS: Soil and Rock Description TOPSOIL Silty Sand, Trace Fine gravel (SM), >50% Fine Sand, 30% Non-Plastic Fines, 5% Fine Gravel, Sub-Rounded, Light Grey, Moist, Medium Dense Silt with Fine Sands (ML) >50% Non Plastic Fines, ~10%, Fine Sand, Brownish Gray, Moist, Very Loose. Clayey Sand, Trace Gravel (SC) >50% Coarse Sand, ~30% Medium Plasticity Fines, ~5% Gravel, Gray, Wet, Very Loose. Sandy Fat CLAY (CH), >50% Medium Plasticity Fines, ~10% Sand, Brownish Gray, Most, Very Soft. SAME, ~0% Sand. Undistrubed Sample Clayey SAND, Trace Gravel and Organics, (SC), >50% Coarse to Medium Sand, ~20% Medium to Low Plasticity Fines, ~5% Gravel, 1/10", 1/2", 50% Medium Plasticity Fines, Brownish Gray, Moist, Very Soft. -10 NOTES: 35 S-8 33.5 to 35 18/18 WOHWOHWOH S-9 38.5 to 18/18 3-2-2 SAME as S-8, Gray. PROJECT NAME: P-561 Aircraft Prototype Facility, Phase 2 CITY/STATE: Patuxent River, Maryland GEI PROJECT NUMBER: 1408530 FIGURE 1 NORTHING: 222170.581 BORING EASTING: 1480008.7041 25.47 DATE START/END: Free State Drilling Drilling Remarks/ Field Test Data Sample Information Elev. Depth Sample Depth (ft) (ft) No. (ft) Pen./ Rec. (in) Blows per 6 in. or RQD GEI-2 9/11/2014 - 9/12/2014 DRILLING COMPANY: Graphic Log GROUND SURFACE EL. (ft): VERT./HORIZ. DATUMS: / PAGE 2 of 2 Soil and Rock Description 40 -20 45 50 S-10 43.5 to 45 18/18 3-2-3 S-11 48.5 to 50 18/18 2-1-3 SAME as S-8, ~5% Sand. Sandy Fat CLAY (CH), >50% Medium Plasticity Fines, ~40% Medium Sand, Gray Moist, Very Soft. Poorly Graded SAND, Trace Fines (SP), >50% Medium Sand, ~15% Low Plasticity Fines, Light Gray, Moist, Medium Dense. -30 55 60 S-12 53.5 to 55 18/12 21-1910 S-13 58.5 to 60 18 13-1319 Poorly Graded SAND, With Fines (SP-SC), >50% Medium Sand, ~5% Low Plasticity Fines, 50% Medium to Coarse Sand, ~40% Gravel, 1/10" to 1/4", Light Gray, Wet, Medium Dense. Clayey SAND with Sea Shells Fragments (SC), >50% Medium Sand, ~30% Sea Shell Fragments, ~20% Low Plasticity Fines, Gray Moist, Medium Dense. SAME as S-16, ~30% Low Plasticity Fines, ~5% Sea Shell Fragments. End of Boring at 80 feet 85 90 NOTES: PROJECT NAME: P-561 Aircraft Prototype Facility, Phase 2 CITY/STATE: Patuxent River, Maryland GEI PROJECT NUMBER: 1408530 e vs log p 1.800 1.600 Void Ratio, e 1.400 1.200 1.000 0.800 0.1 1.0 10.0 100.0 Log p (ksf) Test 1 2 3 Load 2 tsf 4 tsf 8 tsf Cv 0.0120 0.0063 0.0053 Test Load Cv Test Load Cv Specimen Identification Classification (USCS) Dry Density (pcf) Natural Moisture LL (%) PI (%) GEI-2, 20.0 to 22.0 ft CH 61.1 60.1% 102 68 Remarks: Test performed in general accordance with ASTM D2345. Cv values in inches squared per minute. Maximum past pressure = 1.5 ksf Cc = 0.783 Cr = 0.051 CONSOLIDATION TEST REPORT Geo-Technology Associates, Inc. 18 Boulden Circle, Suite 36 New Castle, Delaware 19720 Telephone: (302) 326-2100 Fax: (302) 326-2399 Project: P-561 Aircraft Prototype Facility Client: GEI Consultants, Inc. Number: 141813 
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