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Home My WebLink About1980-07-28 Soil Boring ReportGEOTECHNICAL ENGINEERING CORPORATION 1925 Oawcrest Avenue . Rosevale. Minnesota 55113 1612) 616-771r 26 - 71h Avenue North . St Cloud. M ,`I s.Ia 56301 (612) 2551101 (Ovecf written correspondence to fhe Rosev,ife office ) REPORT OF SUBSURFACE IIIVESTIGATION PROJECT: REPORTED TO: PROPOSED RESIUENCE C. E. Da MART 6 ASSOCIATES ?691 CASCO POINT ROAD 1155n I10NNA TERESA ORONO. MINNESOTA STUDIO CITY, CALIFORNIA 91604 GEC JOB NO: 2525 DATE: JULY 28, 1980 INTRODUCTION On July 24, 1980, we drilled two test borings at the referenced site. Based on the results of the borilris, we have provided recontnendat ions for design and construction of the floor slab and foundation with respect to the sub- surface conditions. TEST BORINGS The boring locations are shown un the attached sketch. The borings were made at locations suggesLed by the client. The borings were made using the ;tandird penetratinn - split spoon method. Refer to the attached sheet !Test Boring and Sampling Procedures) for addi- tional infonl-ation regarding the test taring and sampling procedures. The soils were classified in accordance with the ASTM Visual -Manual Method (ASTM D 2488). Refer to the attached sheet (Unified Soil Classification System) for a description of the classifiLation method. The elevation of the ground surface at the borings was determined in refer- ence to the top nut of the fire hydrant located on the west side of Casco Point Road appro•inlately 25' south of the southeast property corner. An as- sumed bench (nark elevation of 100.0 was used there. HYDROLOGY • SOIL AND FOUNDATION ENGINEERING • TEST BORINGS MATERIALS TESTING • PERCOLATION TESTING • ENGINEERING GEOLOGY • CONSTRUCTION INSPECTION GIC 42525 - Patic 2 RESULTS. OF BORING% General Refer to the attached logs for a description of the subsurface conditions encountered in the boring,. The lo,s show: the depths to the boundaries between the soil layers; the description, classification, and geologic identification of the soils; the surface elevation at the boring; water level measurements; standard penetration resistance (N column); and other information. Refer to the attached sheet (Drilling, Sampling and Testing) for a description of terminology used on the logs. Subsurface conditions can vary from that encountered in the borings at other locations, depths, and times. Dependin; on the degree of variability, this could: 1) necessitate alterinu our conriusions and recommendations for design and construction procedures, and 2) affect the cost of design and construction. The degree of variability cuuld be evaluated by additional ex- ploration. Soils The general soil profile encountered in the borings is surficial :oils over basal soils. The surficial ;oils are topsoil and uncontrolled fill. The basal soils are weatherr:d soil and glacial till. Refer to the attached sheet for a description of geologic terminology. The depths to, and elevations of, the contact between the surficial soils and the basal soils in the borings are shown in the following table. The ground surface elevations at the borings are also shcwn. Boring Number: 1 2 Surface Elevation: 83.8 82.7 Contact - Depth; Feet: 2 6 Elevation: 81-3/4 76-3/4 GEC GEC .?525 - Page 3 Groundwater The groundwater table was not encountered in the borings. However, the 61,' - 8' sample in boring -2 did appear questionable with respect to water - bearing characteristics. Refer to the attached sheet for general informa- tion regarding groundwater conditions and observations. DESIGN 1 IFOR,MAT 10% We understand that the proposed residence: 1) will be located approximately in the arra of the test borings; ?) will be one or two stories in height; 3) will not have a basement, with the lowest floor level at approximately 1' - 2' above present grade; 4) will have the finished grade outside at approximately the present or slightly above the present grade; 5) will have normal tolerance to settlement; 6) will be of conventional design and con- struction; and 7) will be constructed in accordance with applicable build- ing code requirements. Deviations arum the above design information could necessitate altering our conclusions and recommendations. DISCUSSION, CONLLU510NS._AND RECOF4iEN0AT10NS Based on the results of borings, it is our opinion that the basal soils are suitable for slab -on -grade, spread footing type construction. A design bearing pressure of up to 1500 psf is recommended for footings constructed on the basal soils. All surficial soils and other vegetative material should be removed from below the proposed building. Any till placed below the proposed building should be: 1) oversized on a 1:1 ratio outward and downward beyond the top of proposed rootings; 2) inorganic and uniformly compacted to at least 95': of maximum standard Proctor density. Because of the depth of surficial soils in boring +2, consideration should be given to constructing a basement below the proposed residence. By utili- zing a basement, the volume of earthwork would be reduced. GEC GEC •2525 - Page 4 CLOSURL To protect the add ces see, the public, and ourselves, this report (and all supporting information) is provided for the addressee's own use. No repre- sentations are made to parties other than the addressee. The following sheets are attached and constitute an integral part of this report: Logs of Borings (nl and -2) Test Boring and Sampling Procedures Unified Soil Classification System Geologic Terminology Terminology on Boring logs - Drilling, Sampling and Testing Terminology on Boring Logs - Groundwater Boring Location Sketch Report Prepared By: Under the Supervision of: .J- LU -1—t) 1— i J_r,r� CharTes w $isek aobert f.. Pendergast. Kt. Minn. Reg. Ilo. 8450 GEC TEST PORING AND SAMP TNG PROCEDURES STANDARD PENETRATION - SPLIT SPOON (ASTM D 1586) A 1-3/8" ID, 2" OD steel sampling tube is driven into the soil with 140 pound weight falling 30". The number of hammer blows required to drive the sampler 1',after an initial set of ;', is the standard pene- tration test ("N" value). The "N" value is an indication of the strength and compressibility of soil. Split spoon samples normally are taken at intervals of 2k' or 5'. At 2�-' intervals, the depth to contacts between soil layers can be determined to an accuracy of about 1'. At 5' intervals, the depth to contacts between soil layers is determined approximately, and the type of material present between sampling intervals is inferred based on the action of drilling tools. The bore hole is advanced between sampling intervals with a flite auger, or a hollow stem auger, or by rotary drilling. Methods used to stabilize the bore hole include: hollow stem auger, casing, drillien mud, Revert drilling fluid, or a plug of paper at the bottom of the hollow stem auger/casing. AUGER BORINGS An auger is drilled into the soil. The auger is then spun or retracted, and samples are taken at the ground surface or off the auger. Using this method, determination of the depth to contacts between layers normally is approximate only. THIN WALL TUBE SAMPLES (ASTM D 1587) Comparatively undisturbed samples are taken with thin wall tunes which are pushed hydraulically into soil. STATIC CONE TESTS The static cone test entails measuring the force required to push a steel cone penetrometer into soil. Cone diameters are 1-3/4",2%",and Y. The apex angle is 60'. The cone is pushed hydraulically at a rate of k" per second. The static cone bearing pressure, qc, is the total load divides: by the projected end area of the cone. The static cone bearing pressure is an indication of the strength and compressibility of soil. CORING (ASTM D 2113) Coring is done with a diamond or carbide bit on a double tubed barrel. 1 3/79 GEOLOGIC TERMINOLOGY The geologic description indicates the apparent depositional origin or strati - graphic name. Geologic identification is interpretive and subject to error. General categories of geologic deposits and descriptive information is as follows: BEDROCK Often a hard, dense, consolidated rock formation. Can also be soft, compressible, or unconsolidated. COARSE ALLUVIUM Sandy (and gravelly) soil. Stratified. Deposited from fast moving waters in streams, rivers and deltas. FILL CONTROLLED: Compact, uniform material; inorganic; no debris. UNCONTROLLED: Loose, non-uniform; organic materials; debris. FINE ALLUVIUM Clayey and/or silty soil. Stratified. Deposited from slow moving waters in streams, rivers, and lakes. GLACIAL TILL Inorganic soil. Normally contains a wide range of grain sizes, from clay through boulders. Non -stratified. Deposited directly from glaciers. LAKE DEPOSIT Clayey soil. Laminated. Deposited from very slow moving waters in ponds and lakes. LOESS Silty soil. Non -stratified. Upper layer. Deposited from wind. OUTWASH Coarse alluvium deposited from glacial meltwaters. SLOPEWASH Organic and/or inorganic material. Washed from slopes and deposited in depressions. SWAMP DEPOSIT I it, ii.—k, and mar.. Formed through accumulation of r•:�nic material under water. TOPSOIL Contains both inorganic and organic material. Upper, black layer of soil. Formed by weathering of inorganic soil and accumulation of organic material. TUMBLEROCK Dominantly gravel, boulders and rock slabs. Deposited from gravity flow down hills or cliffs. WEATHERED BEDROCK Bedrock which has been substantially weathered through disintegration or decomposition. WEATHERED SOIL Texture and composition is transitional between topsoil and underlying non -weathered soil. -Geolechnical Engineering Cofporalion AM" &VISOW &wowl"rr jQ&Jrypm& DrscAvrAm ow 7414 rAL. J4 S apnl,, sc.'s (,", . - op Soi QvLLS IlIh I,,( I wlr Gc WID alcm SIM Sr $M $IC ML 11" SILTS ma CL � CLAYS LLLLii1I — 30 OL MH flfl• fell SILTS 70 CH ON —1c IIIGtY (Al—c K"S PT "a CLAsuricATION CEART UNIFIED SOIL CLASSIFICATION SYSTEM TERMINOLOGY ON BORING LOGS: DRILLING,_SAMPLING AND TESTING A,B,N: A, B, or N size casing or core. AC: At completion of boring. 2'„4 cas: 21,” and 4" inside diameter casing. CONS: One dimensional consolidation test. DEN: Dry density, pounds/cubic ft. DM: Drilling mud. 4,6 FA: 4" and 6" diameter flite auger, motor driven. HYD: Hydrometer analysis. (Grain size distribution test.) HA: Hand auger. HSA: 3'" inside diameter hollow stem auger. LL: Liquid Limit. MC: Moisture content, percent of dry weight. N: Standard penetration test, penetration resistance, or N value, blows/foot. ORG: Organic content, percent. PAP: Paper plug. PERC: Percolation rate, minutes per inch. PERM: Permeability test. PL: Plastic Limit. qp: Pocket Penetrometer strength, pounds/sq. ft. qc: Static cone bearing pressure, tons/sq. ft. qu: Unconfined compressive strength, pounds/sq. ft. RD: Rotary drilling, using drilling fluid and a cone-type roller bit. REL: In split spoon and thin wall tube sampling, the length of sample recovered, in inches. in rock coring, the length of core recovered as a percentage of the total core run. REV: Revert drilling fluid. SA: Sieve analysis. (Grain size distribution test.) SG: Specific gravity. SS: Standard Split Spoon Sampler. Steel, 1-3/8" inside diameter, 2" outside diameter. 2, 3 TW: 2" and 3" diameter thin wall tube sampler. VS: Vane shear strength, pounds/sq. ft. WASH: Sample recovered from circulating drilling fluid. WAT: Water. WB: Describes whether the sample appears to be waterbea.inq. (See attached sheet for additional information.) WH: Sampler advanced by static weight of drill rod and 140 lb. hammer WR: Sampler advanced by static weight of AW size drill rod. -200: Amount of material finer than 4200 sieve, percent. Water level symbol. (See attached sheet for additional information.) GLOTECNNICAL ENGINEERING CORPORATION 5/80 6/80 TERMINOLOG-Y_ - 011 BORING - - - - LOGS --------- GROUNDWATER Groundwater information is shown in two places on logs: 1) under "Water Level Measurements" and 2) in the "WB" column. Information under Water Level Measurements includes: 1) The depth to the water level (or drilling mud, if used) and the depth to the bottom of the hole (cave-in). Water level and cave-in measurements are taken with a weighted measuring tape. If free-standing water is not encountered in the hole, the term wet, or dry, is indicated under water level. This means that the soil adhering to the end of the measuring tape did, or did not, respectively, appear to be saturated. 2) The depth sampled and the depth of casing (or hollow -stem auger) for measurements made during the progress of the boring. 3) Date and time of measurements. Notation in the WB column describes whether soil samples appear to be water - bearing or saturated. Y means yes, N means no, and ? means questionable or indefinite. The water level symbol _V in the WB column indicates the apparent depth to the groundwater table at the bore hole. Determination of the depth to the groundwater table is an interpretive process. The determination is based on various factors, including: water level measurements, the appear- ance of samples, overall subsurface conditions, site conditions and weather conditions. The accuracy of the indicated depth to the groundwater table can be quite variable. The water level symbol with an arrow pointed down- ward (or upward) indicates that the water level is at or below (or above) the level indicated. Absence of the water level symbol does not neces- sarily mean groundwater was not encountered, or that the water table or piezometric surface was not penetrated. The presence of groundwater in the soil and the level of the groundwater table can change with time. The information in the WB column is based on observations and measurements made at the time the boring was drilled and water level measurements were taken. GEOTECHNICAL ENGINEERING CORPORATION 2525 I DEC JOE NO VENTICAL SCA+L 1 I ... „. PNDACT PROPOSED RESIDENCE, 2697 CASCO POINT ROAD, ORDNO.--"I NNESOTA SURFACE ELEVATION 83.8 1 -- PEET DESCRIPTION AND CLASSIFICATION GEOI OGI '1 1.. r1 ac •mow __Poo s _LMj 3 N SS i 16 I- SANDY SILT, grayish black, with a TOPSOIL trace of roots, (SM -ML) CLAYEY SAND, brown, with a trace of T WEATHERED 5 11 SS 14 a• roots. with faint mottles, (SC) SOIL SANDY CLAY, tan, with a trace of E 9 N S'- 16 E- gravel, mottled orange b gray, (CL) T 10 N SS 15 E GLACIAL E- -- ------,---_ TILL I I SANDY CLAY, brown, with a trace of I 10- gravel, mottled orange b gray, ; I 14 N SS 18 +I with a few black specks, (CL) Ia SANDY CLAY, gray, with a trace of 14I N SS 118 yravel, with a few black specks, u- (CL) i 'E- I 14) IN S5 18 T- IT- END OF BORING u- III- DEPTH DEPTH DAILLINO METNOO WATER LEVEL MEASUREMENTS NOTE. RERR TO -T SAMPLED' CASING CA" IN r DIALLING WATER 0-1411: F:SA DATE TIME DEPTH DEPTH DEPTH MUDLEVEL LEVEL THIATTACHED sHEETESOR Aw 7/24 12. -SSI 16 14.5 15.21 dr 7/24 A.C. .8 dr EXPLANATION Of TERMINDLOOv 110"r - -- r1uL„ 7/24/ 80 :06 C:� DIE: jjRi9 55 — — ON THIS LOG 2525 1_ DEC JOE NO VISITICAL SCALE 1 ! '• '• _ �_ _ PROJECT PROPOSED RESIDENCE, 269_7 CASCO POINT ROAD. ORONO. MINNESOTA -- _- - -T- 1 -- •"/=\(1M_ 11511 OEP/H. WAF ACE ILIYAT,OM 83•8 PSET DESCRVTION ANO CLASSIFICATION GEDIGGY ' I'• P ac ,w -roots.-M) 3 N S, 16 1- SANDY SILT, grayish black, with a TOPSOIL I ' trace of roots, (SM-ML) CLAYEY SAND, brawn, with a trace of WEATHERED 5 f1 SS 14 3- roots. with faint mottles. (SC) SOIL � s 9 N ' SS 16 SANDY CLAY, tan, with a trace of ravel, mottled orange E gray, E T- 10 N SS 15 i 41- GLACIAL TILL SANDY CLAY, brown• with a trace of ;4 N SS 18 to gravel, mottled orange d gray, i 11 with a few black specks, (CL) 1} SANDY CLAY, gray, with a trace of 14 N SS 118 gravel, with a few black specks. u- t• - (CL) IS 14 N i SS 19 NO OF BORING tE- I i 1 10 71 DEPTH ORgUNO MITH00WATER LEVEL MEASUREMENTS NOTE. REFER TO 0-14%: HSA DATE 11ME 'SAMPLED' CASINO CAVE IN r DRILUND WATER DEPTH OEPTH DEPTH MUD LEVEL LEVEL THE ATTACHED FDR AN EIIPLANAnoNDIP TERMINOLOGY ON THIS LOG 7 24 12:55 16 14.5 15.21 drySHEET: 7 24 A.C. 8.8 _ OO, v ouuruOlu• 7/24/80 1:Ci C:Igi D1r: jjRig, 55 OEDTECiN11 M ENQMYEEANIIG C0RP0MATWft------- -- — --- --, 2525 GEt JON NO vINT1CAL SMI I I PROPOSED RESIDENCE, 2697 CASCO POINT ROAD, ORONO_MINNESOTA Pf"CT oarr» werwa ufvwnoN_��.L� ' --- .. . •.. _; l' I rain otwelrtlorr ANO CLA►SUICATION Gt Ot Ol.♦ '� I r _ _ _ aC ,. Ml Eli d _ ew ro - s I- CLAYEY SAND, with a trace of grave . with a trace of black,mottled.(SC) UNCON- TROLLED SANDY CLAY, brown, with a trace FILL 6 It SS 12 i 3- of gravel, with a trace of black. mottled, (CL) SANDY SILT, dark grayish brown, S with a trace of roots E root TOPSOIL g N SS 14 channels, (plastic -ML) SANDY CLAY,mottled gray A reddish T- brown, with a trace of roots, (CL 4 ? SS lR E t SANDY CLAY, brown, with a trace of gravel, mottled orange b gray. IO with a few black specks. (CL) 9 tl SS 7 i , SAVY CLAY, grayish brown, with a 12- trace of gravel, mottled orange 6 15 N SS lA 13 Qrax, with a few black specks, i (CL) GLACIAL 14- -- ---- -- -- - TILL If '1 N ;; if, It_ SANDY CLAY, gray, with a trace of I rave), with a fe„ black specks, CL 1E SANDY CLAY, gray, with a trace of gravel, mottled, (CL) Is - To - 24 N I SS 16 -------END Of BORItIG----- -- i Capt. OAILLINO MtT»00 INATEII LEVEL MEASUREMENTS NOTE 11ErER TO 0_19: NSA SAMrLEO. CASING CAL'E INDIIILLINr, . VVATEII OATS I TIME Dept. 0E0TH D"T» MUO ""'L LEVEL THE ATTACHED 7/24 2:20 1 20' 19 20.1 dr SHEETS FOR AN _ _7/24 A.C. — �.66 r EarLANAT1oNa U0.1 .inn 7/24/80 2:35 I T —+ - - TEAIAINOLOGr -C: mHDlr: JJ Rig- 55 ON THIS LOG Z o u 270 ^ p.� 0 0 W t O u _� u v o vu x L U1 to H o W � Z j r)� i IL G L 4 C3 O N � W � � M N N d O N d L C u� ' V i u • • � a�ivv % C V U O i ' r OI O dC a O y -0.5 L n J U C D tl � 0 w o u c J (/ d M N Y I C O N d d C Y C A'r J Z