Minnesota Department of Transportation MEMO Office of Materials Mailstop Gervais Avenue Maplewood, MN 55109
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1 Minnesota Department of Transportation MEMO Office of Materials Mailstop Gervais Avenue Maplewood, MN 9 Date: July 31, 08 To: Robert Evbayekha, Final Design Waters Edge From: Jeff Narr, Graduate Engineer 1 Geotechnical Engineering Section Concur: Concur: Gary Person, Foundations Engineer Geotechnical Engineering Section Rich Lamb, Foundations Project Engineer Geotechnical Engineering Section Subject: S.P TH 280 Retaining Wall 1 Located between Como and Larpenteur Avenues Foundations Investigation & Recommendations Project Description This letter provides for a foundation analysis and recommendations for constructing Retaining Wall 1 as part of the Larpenteur Avenue bridge construction in St. Paul. The new wall will be constructed to retain soils on the east side of TH 280 NB. Field Investigation and Foundation Conditions Five foundation borings were taken at this site in May 08 by Braun Intertec. The foundation soils at the proposed wall location consist of sandy loam or clay loam with some pockets of silt. The water table was measured to be between elevations ft. during normal drilling operations. Please see the attached boring logs for a more detailed description of the foundation soils. Foundation Analysis Existing ground lines, bottom of footing, and top of wall elevations were determined from preliminary plan and profile sheets (see attached wall profile). Spread Footing Bearing Capacity Bearing capacities were calculated for the foundation soils and compared with the required base pressures listed in the Bridge Design Manual for the equivalent retaining wall heights. For this analysis we assumed a 2 ft. live load surcharge loading case. Based on our analysis, the foundation soils from Wall Station +00 to 1+80 (sandy loam or clay loam) were determined to have adequate bearing capacities to support the wall. However, a 2 ft. subcut is recommended to remove some of the softer, more compressible foundation soils. This will reduce both the total and differential settlement.
2 S.P TH 280 Ret. Wall 1 Foundations Investigation & Recommendations 7/31/08 Settlement Wall settlements were calculated based on the bearing pressures listed in Mn/DOT s Bridge Standard Plans Manual using the retaining wall heights. In addition, our analysis was based on a triangular strip loading stress distribution with the load varying from the maximum toe pressure to zero. Based on our analysis, and assuming the proposed 2 foot subcuts are performed, we estimate that the wall will settle a maximum of 1-2 in. at the toe during construction and backfilling operations. In addition, we estimate that differential settlement from one wall panel to the next should be limited to 1 in. or less. Recommendations Based on the existing conditions along with an analysis of the project soils, we recommend that: 1. Topsoil and other organic material should be removed from areas where fill is to be placed. A 2 ft. subcut below the proposed bottom of footings for the entire length of the wall. 2. The wall should be subcut and backfilled according to the attached Diagram F-1 (Structural Backfill, Footing Subcut & Drainage System Treatment). 3. Footings should be buried a minimum of 4. ft. below the final ground line for frost protection. 4. If the foundation soils found in the field during construction differ from those described in this report, please contact our office for revised foundation recommendations. Attachments: Boring Log STRW1-1, STRW1-2, STRW1-3, STRW1-4, STRW1- (Unique Numbers: ) Boring Plan, Wall Profile, Diagram No. F-1, Boring Index Sheet cc: G. Engstrom D. VanDeusen E. Embacher File 2
3 P P P P P P P P P P RETAINING WALL 1 P P P P STRW1-4 STRW1-3 STRW1-2 STRW1-1 1 STRW1-
4 RETAINING WALL RW1 +00 TOP OF RETAINING WALL TOP OF BARRIER 9 Coh STRW1-1 - # Coh 4 1/2" BIT and 9" CONC over " AGG SAND and GRAVEL, A1 A2 A3 A4 A A6 A7 A8 brn, wet, fill 900 CLAY LOAM w/g, gry, brn and blk, moist, stiff, fill pl SANDY LOAM, w/g, brn, moist, Vstiff, fill CLAY LOAM w/ a little TOP OF FOOTING 890 G, gry, moist, Vstiff, fill CLAY LOAM, w/ a little G, brn, moist, Vstiff, fill pl SANDY LOAM, w/g, dk brn w/dk gry, moist, Vstiff, fill CLAY LOAM, gry w/brn 880 and blk, moist, Vstiff, fill SAND & GRAVEL, w/slag, brn, moist, meddense, fill pl SANDY LOAM, w/cinders and coal, blk, moist, Vstiff, fill 870 slpl SANDY LOAM, brn-gry, moist, meddense, fill LOAMY FINE SAND, trace roots and a little G, gray-brn, wet, loose 860 to meddense pl SANDY LOAM, w/ a little G, brn, wet, stiff to Vstiff Bottom of Hole - 36 Water measured at 30 while sampling and/or 80 drilling Borehole then grouted with bentonite STRW1-2 - # " BIT over " of Agg. Base SAND & GRAVEL, brn, wet, fill 17 pl SANDY LOAM, w/g, 19 brn, moist, stiff to Vstiff, fill SAND & GRAVEL, w/ 63 chunks of SL, brn, moist, dense to 36 Vdense, fill pl SANDY LOAM, w/g, brn, wet, stiff, fill SIL, org, blk, wet, firm 8 SiL, lt gry w/rust, wet, firm CLAY LOAM w/ a little G, gry, wet, firm to stiff 6 CLAY LOAM w/ a little G, brn, wet, firm to stiff Bottom of Hole - 41" Water measured at 1/2 while sampling and/or drilling Borehole then grouted with bentonite
5 A19 A 900 A11 A A A A1 A A STRW1- - # STRW1-3 - # oh pl SANDY LOAM, blk, moist, fill 890 SANDY LOAM, w/ a little G, brn, moist, firm BOTTOM OF FOOTING 7 to stiff 22 SIL, tan, wet, firm to soft F SAND, brn, sat, meddense 26 slpl SANDY LOAM, w/g, lt gry, sat, 21 meddense pl SANDY LOAM, w/g, brn, wet, Vstiff 870 CLAY LOAM w/ G, gry, wet, stiff 17 pl SANDY LOAM, w/ G, brn, wet, Vstiff Bottom of Hole - 26 Water measured at while sampling and/or drilling Borehole then grouted with bentonite INPLACE GROUNDLINE Coh STRW1-4 - # LOAM, dk brn, moist, fill CLAY LOAM, brn, wet, soft to firm, fill pl SANDY LOAM, brn, wet, stiff, fill SIL, org, dk brn, wet, firm CLAY LOAM, slorg, dk gry, wet, firm to stiff F SAND, dk brn, sat, meddense F SAND, gry, sat, meddense nonpl SANDY LOAM, gry, sat, loose to meddense CLAY LOAM w/ a trace of G, gry, wet, firm Bottom of Hole /2 Water measured at 2.3 while sampling and/or drilling Borehole then grouted with bentonite Coh pl SANDY LOAM, concrete chips at depth, dk brn, moist, firm, fill SIL, w/seams of S, brn, wet, firm, fill nonpl SANDY LOAM, slorg, blk, wet, loose, fil LOAMY SAND, tan, wet, meddense, fill CLAY LOAM, dk brn, wet, stiff slpl SANDY LOAM, w/ a little G, brn, wet, meddense nonpl SANDY LOAM, brn, wet, loose to dense CLAY LOAM, tan, wet, Vstiff LOAMY F SAND, brn, sat, meddense CLAY LOAM, w/ a trace of G, gry, wet, stiff pl SANDY LOAM, w/ G, gry, wet, Vstiff Bottom of Hole - 31 No water encountered or measured during drilling Borehole then grouted with bentonite
6 UPUP MINNESOTA DEPARTMENT OF TRANSPORTATION VARIABLE BACKSLOPE EXISTING GROUND EXISTING GROUND C 1 SELECT GRANULAR BORROW, MODIFIED TO < % PASSING NO. 0 SIEVE 2:1 MINIMUM LIMITS OF WEDGE OF SPECIFIED BACKFILL MATERIAL FINAL GRADE 2:1 ANY SUITABLE BACKFILL MATERIAL A 2:1 4. D B PAY LIMITS FOR STRUCTURAL EXCAVATION WHEN A SUBCUT ANY SUITABLE BACKFILL MATERIAL 2: GRANULAR BORROW 2:1 IS REQUIRED. ACTUAL EXCAVATION SLOPE IS DETERMINED BY OSHA REGULATIONS AND IN-SITU SOILS. SUBCUT (D) DETERMINED FROM FOUNDATION OMMENDATION REPORT NOT TO SCALE All slope dimensions shown as V:H THE OMMENDATIONS MAY BE MODIFIED AS PER THE ATTACHED FOUNDATIONS INVESTIGATION AND OMMENDATION REPORT EXCAVATION AND BACKFILL NOTES: DRAINAGE SYSTEM NOTES: 1 Mn/DOT SPEC. 39.2B2 MODIFIED TO % PASSING THE NO. 0 SIEVE COMPACT BACKFILL TO SPECIFIED DENSITY METHOD Mn/DOT SPEC. 2.3F1 2 IF SUBCUT IS REQUIRED, BACKFILL WITH GRANLAR BORROW, Mn/DOT SPEC. 39.2B1. COMPACT BACKFILL TO 0% OF STANDARD PROCTOR (T-99). REFER TO FOUNDATION OMMENDATION LETTER FOR SUBCUT S. PROVIDE WALL DRAINAGE SYSTEM A, B OR C A B PLACE A 6 IN. I.D. NON-STEEL PERFORATED PIPE(Mn/DOT SPEC. 324) WRAPPED WITH A TYPE I GEOTEXTILE FABRIC (Mn/DOT SPEC. 3733) RUNNING THE ENTIRE LENGTH OF THE WALL AND LAID A MINIMUM OF 2 IN. ABOVE THE TOP OF FOOTING (OPTION A) OR BOTTOM ELEVATION OF THE FOOTING (OPTION B). STRUCTURAL BACKFILL MATERIALS SHALL COMPLETELY SURROUND THE PIPE. AT ALL TIMES, THE SLOPE OF THE PIPE SHALL BE CHECKED TO ENSURE POSITIVE DRAINAGE. FREQUENT TIES (SPACED APPROXIMATELY 0 FT. APART) SHALL BE MADE FROM THE PIPE TO THE INPLACE OR PROPOSED DRAINAGE SYSTEM. C PROVIDE WEEP HOLES AS SPECFIED IN THE BRIDGE STANDARD PLANS MANUAL, STANDARD SHEET TO STATE OF MINNESOTA DEPARTMENT OF TRANSPORTATION STRUCTURAL BACKFILL, FOOTING SUBCUT & DRAINAGE SYSTEM TREATMENT (STANDARD CANTILEVER RETAINING WALL DESIGN) November 0 PREPARED BY THE FOUNDATIONS UNIT GEOTECHNICAL ENGINEERING SECTION - OFFICE OF MATERIALS DIAGRAM NO. F-1
7 Minnesota Department of Transportation Geotechnical Section Boring Log Descriptive Terminology (English Units) USER NOTES, ABBREVIATIONS AND DEFINITIONS - Additional information available in Geotechnical Manual. This boring was made by ordinary and conventional methods and with care deemed adequate for the Department's design purposes. Since this boring was not taken to gather information relating to the construction of the project, the data noted in the field and recorded may not necessarily be the same as WH... Weight of Hammer WR... Weight of Rod Mud... Fluids in Sample CS... Continuous Sample very loose loose...- medium dense dense very dense...>0 that which a contractor would desire. While the Consistency - Cohesive s BPF Department believes that the information as to the conditions and materials reported is accurate, it does not warrant that the information is necessarily complete. This information has been edited or abridged and may not reveal all the information which might be useful or of interest to the contractor. Consequently, the Department will make available very soft soft firm...-8 stiff very stiff hard very hard...> 60 at its offices, the field logs relating to this boring. Since subsurface conditions outside each borehole are unknown, and soil, rock and water conditions cannot be relied upon to be consistent or uniform, no warrant is made that conditions adjacent to this boring will necessarily be the same as or similar to those shown on this log. Furthermore, the Department will not be responsible for any interpretations, assumptions, projections or interpolations made by contractors, or other users of this log. Water levels recorded on this log should be used with discretion since the use of drilling fluids in borings may seriously distort the true field conditions. Also, water levels in cohesive soils often take extended periods of time to reach equilibrium and thus reflect their true field level. Water levels can be expected to vary both seasonally and yearly. The absence of notations on this log regarding water does not necessarily mean that this boring was dry or that the contractor will not encounter subsurface water during the course of construction. WATER MEASUREMENT AB... After Bailing AC... After Completion AF... After Flushing w/c... with Casing w/m... with Mud WSD... While Sampling/ w/aug... with Hollow Stem Auger MISCELLANEOUS NA... Not Applicable w/... with w/o... with out sat... saturated SOIL/CORE TESTS N ASTM D6 Modified Blows per foot with 0 lb. hammer and a standard energy of 2 ft-lbs. This energy represents 60% of the potential energy of the system and is the average energy provided by a Rope & Cathead system.... Moisture Content... Cohesion γ... Sample Density LL... Liquid Limit PI... Plasticity Index Φ... Phi Angle... Percent Recovered... Quality Description (Percent of total core interval consisting of unbroken pieces 4 inches or longer)... Average Length (Average length of core that is greater than 4 inches long)... Number of natural core breaks per 2-foot interval. DISCONTINUITY SPACING Fractures Distance Bedding Very Close... <2 inches...very Thin Close inches...thin Mod. Close inches...medium Wide... >36 inches...thick WS PD DRILLING SYMBOLS Vane Shear Test Washed Sample (Collected during plug drilling) Augered Plug Drilled Split Tube Sample ( 2 in. spilt tube with liners) Thin Wall Sample (3 in. Shelby Tube) % Sand Drilled 70 DRILLING OPERATIONS (NV Barrel unless otherwise noted) 80 AUG... Augered CS Continuous 90 CD... Drilled Sample LS DBD... Disturbed by A/J 0% S Augered & Jetted DBJ... Disturbed by Jetting Jet Jetted PD... Plug Drilled A/P ST... Split Tube ( test) Augered & Plug Drilled TW... Thinwall (Shelby Tube) WS... Wash Sample RELATIVE DENSITY NSR... No Sample Retrieved Compactness - Granular s Index Sheet No. 3.0 March 03 G:\geotech\Public\Forms\INDEX30.doc BPF 60 0 COLOR blk... Black wht...white grn... Green brn...brown orng... Orange yel...yellow dk... Dark lt...light IOS... Iron Oxide Stained GRAIN SIZE /PLASTICITY VF... Very Fine pl...plastic F... Fine slpl...slightly Cr... Coarse Plastic SOIL/ROCK TERMS C... Clay Lmst...Limestone L... Loam Sst...Sandstone S... Sand Dolo...Dolostone Si... Silt wx...weathered G... Gravel (No. Sieve to 3 inches) Bldr... Boulder (over 3 inches) T... till (unsorted, nonstratified glacial deposits) Mn/DOT Triangular Textural System 40 SC SCL (plastic) SL (slightly plastic) C CL L 0 % % Silt Si SiCL SiL % Clay Si %
8 State Project Location,, ft. LT Ramsey Co. Coordinate: X=4623 Y=1789 Latitude (North)=44 9'17.28" MINNESOTA DEPARTMENT OF TRANSPORTATION - GEOTECHNICAL SECTION UNIQUE NUMBER Longitude (West)=93 '.71" (ft.) Drill Machine 711 SHEET 1 of 2 Hammer CME Automatic Calibrated Completed /8/08 STRW (ft) /2" BIT and 9" CONC over " AGG SAND and GRAVEL, brn, wet, fill 9 CLAY LOAM w/g, gry, brn and blk, moist, stiff, fill pl SANDY LOAM, w/g, brn, moist, Vstiff, fill CLAY LOAM w/ a little G, gry, moist, Vstiff, fill 22 CLAY LOAM, w/ a little G, brn, moist, Vstiff, fill pl SANDY LOAM, w/g, dk brn w/dk gry, moist, Vstiff, fill 21 CLAY LOAM, gry w/brn and blk, moist, Vstiff, fill SAND & GRAVEL, w/slag, brn, moist, meddense, fill 26 4 pl SANDY LOAM, w/cinders and coal, blk, moist, Vstiff, fill Index Sheet Code 3.0 slpl SANDY LOAM, brn-gry, moist, meddense, fill LOAMY FINE SAND, trace roots and a little G, gray-brn, wet, loose to meddense (Continued Next Page) G:\GINT\PROJECTS-ACTIVE\6241-1_TH280_LARPENTEUR.GPJ
9 MINNESOTA DEPARTMENT OF TRANSPORTATION - GEOTECHNICAL SECTION UNIQUE NUMBER Mn/DOT GEOTECHNICAL SECTION - LOG & TEST RESULTS SHEET 2 of 2 State Project STRW (ft) 1 LOAMY FINE SAND, trace roots and a little G, gray-brn, wet, loose to meddense (continued) pl SANDY LOAM, w/ a little G, brn, wet, stiff to Vstiff Bottom of Hole - 36' Water measured at 30' while sampling and/or drilling Borehole then grouted with bentonite 29 G:\GINT\PROJECTS-ACTIVE\6241-1_TH280_LARPENTEUR.GPJ
10 State Project Location,, ft. LT Ramsey Co. Coordinate: X=46488 Y=1736 Latitude (North)=44 9'.73" MINNESOTA DEPARTMENT OF TRANSPORTATION - GEOTECHNICAL SECTION UNIQUE NUMBER Longitude (West)=93 '.21" (ft.) Drill Machine 711 SHEET 1 of 2 Hammer CME Automatic Calibrated Completed /8/08 STRW (ft) " BIT over " of Agg. Base SAND & GRAVEL, brn, wet, fill 17 pl SANDY LOAM, w/g, brn, moist, stiff to Vstiff, fill SAND & GRAVEL, w/ chunks of SL, brn, moist, dense to Vdense, fill 36 NSR pl SANDY LOAM, w/g, brn, wet, stiff, fill Index Sheet Code 3.0 SIL, org, blk, wet, firm SiL, lt gry w/rust, wet, firm (Continued Next Page) 37 G:\GINT\PROJECTS-ACTIVE\6241-1_TH280_LARPENTEUR.GPJ
11 MINNESOTA DEPARTMENT OF TRANSPORTATION - GEOTECHNICAL SECTION UNIQUE NUMBER Mn/DOT GEOTECHNICAL SECTION - LOG & TEST RESULTS SHEET 2 of 2 State Project STRW SiL, lt gry w/rust, wet, firm (continued) (ft) 8 27 CLAY LOAM w/ a little G, gry, wet, firm to stiff CLAY LOAM w/ a little G, brn, wet, firm to stiff Bottom of Hole - 41" Water measured at 1/2 while sampling and/or drilling Borehole then grouted with bentonite 1 G:\GINT\PROJECTS-ACTIVE\6241-1_TH280_LARPENTEUR.GPJ
12 State Project Location ,, ft. LT Ramsey Co. Coordinate: X=46499 Y=1721 Latitude (North)=44 9'.36" MINNESOTA DEPARTMENT OF TRANSPORTATION - GEOTECHNICAL SECTION UNIQUE NUMBER pl SANDY LOAM, blk, moist, fill Longitude (West)=93 '.04" (ft.) Drill Machine 711 SHEET 1 of 2 Hammer CME Automatic Calibrated Completed /9/08 STRW (ft) SANDY LOAM, w/ a little G, brn, moist, firm to stiff Redrilled to retrieve thinwall samples SIL, tan, wet, firm to soft Dry Density = 94 pcf F SAND, brn, sat, meddense slpl SANDY LOAM, w/g, lt gry, sat, meddense pl SANDY LOAM, w/g, brn, wet, Vstiff CLAY LOAM w/ G, gry, wet, stiff pl SANDY LOAM, w/ G, brn, wet, Vstiff Dry Density = 1 pcf 2 Index Sheet Code 3.0 (Continued Next Page) G:\GINT\PROJECTS-ACTIVE\6241-1_TH280_LARPENTEUR.GPJ
13 MINNESOTA DEPARTMENT OF TRANSPORTATION - GEOTECHNICAL SECTION UNIQUE NUMBER Mn/DOT GEOTECHNICAL SECTION - LOG & TEST RESULTS SHEET 2 of 2 State Project pl SANDY LOAM, w/ G, brn, wet, Vstiff (continued) Bottom of Hole - 26' Water measured at.9' while sampling and/or drilling Borehole then grouted with bentonite 17 (ft) STRW G:\GINT\PROJECTS-ACTIVE\6241-1_TH280_LARPENTEUR.GPJ
14 State Project Location,, ft. LT Ramsey Co. Coordinate: X=46428 Y= Latitude (North)=44 9'21.74" MINNESOTA DEPARTMENT OF TRANSPORTATION - GEOTECHNICAL SECTION UNIQUE NUMBER Longitude (West)=93 '.03" (ft.) Drill Machine 711 SHEET 1 of 2 Hammer CME Automatic Calibrated Completed /9/08 STRW (ft) LOAM, dk brn, moist, fill CLAY LOAM, brn, wet, soft to firm, fill 4 Offset 17 feet northeast to avoid running over a pvc drain outlet Redrilled to retrieve thinwall samples Dry Density = 9 pcf pl SANDY LOAM, brn, wet, stiff, fill SIL, org, dk brn, wet, firm Dry Density = 1 pcf CLAY LOAM, slorg, dk gry, wet, firm to stiff F SAND, dk brn, sat, meddense Dry Density = 87 pcf F SAND, gry, sat, meddense nonpl SANDY LOAM, gry, sat, loose to meddense 2 Index Sheet Code 3.0 (Continued Next Page) G:\GINT\PROJECTS-ACTIVE\6241-1_TH280_LARPENTEUR.GPJ
15 MINNESOTA DEPARTMENT OF TRANSPORTATION - GEOTECHNICAL SECTION UNIQUE NUMBER Mn/DOT GEOTECHNICAL SECTION - LOG & TEST RESULTS SHEET 2 of 2 State Project STRW (ft) 1 21 nonpl SANDY LOAM, gry, sat, loose to meddense (continued) CLAY LOAM w/ a trace of G, gry, wet, firm 30 NSR Bottom of Hole /2' Water measured at 2.3' while sampling and/or drilling Borehole then grouted with bentonite G:\GINT\PROJECTS-ACTIVE\6241-1_TH280_LARPENTEUR.GPJ
16 State Project Location,, ft. LT Ramsey Co. Coordinate: X=46398 Y=17247 Latitude (North)=44 9'22.90" MINNESOTA DEPARTMENT OF TRANSPORTATION - GEOTECHNICAL SECTION UNIQUE NUMBER Longitude (West)=93 '.44" (ft.) Drill Machine 711 SHEET 1 of 2 Hammer CME Automatic Calibrated Completed /9/08 STRW (ft) pl SANDY LOAM, concrete chips at ' depth, dk brn, moist, firm, fill 7 Redrilled to retrieve thinwall samples SIL, w/seams of S, brn, wet, firm, fill nonpl SANDY LOAM, slorg, blk, wet, loose, fill LOAMY SAND, tan, wet, meddense, fill CLAY LOAM, dk brn, wet, stiff Dry Density = 7 pcf 1 slpl SANDY LOAM, w/ a little G, brn, wet, meddense nonpl SANDY LOAM, brn, wet, loose to dense CLAY LOAM, tan, wet, Vstiff Index Sheet Code 3.0 LOAMY F SAND, brn, sat, meddense (Continued Next Page) G:\GINT\PROJECTS-ACTIVE\6241-1_TH280_LARPENTEUR.GPJ
17 MINNESOTA DEPARTMENT OF TRANSPORTATION - GEOTECHNICAL SECTION UNIQUE NUMBER Mn/DOT GEOTECHNICAL SECTION - LOG & TEST RESULTS SHEET 2 of 2 State Project LOAMY F SAND, brn, sat, meddense (continued) CLAY LOAM, w/ a trace of G, gry, wet, stiff (ft) STRW Dry Density = 1 pcf pl SANDY LOAM, w/ G, gry, wet, Vstiff Bottom of Hole - 31' No water encountered or measured during drilling Borehole then grouted with bentonite G:\GINT\PROJECTS-ACTIVE\6241-1_TH280_LARPENTEUR.GPJ
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