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Home My WebLink About1988-05-11 Report of Soil InspectionALLIED TEST DRILLING COMPANY A1 D 4000 BEAU D'RUE DRIVE EAGAN, MN 55122 Exploration - Evaluation - Foundation Engineering (612) 452.6913 11 may 1?8 i II, MAY 2e Mr Tam Terry LJ �l Terry Built. Hodes 540 urono orchard Foad Waynat.a MN bb.j9l Re: Soils Inspection Proposed Single Family Residence --=�ip 1580 Fox Street Orono, Minnesota Project 88071 This is to summarize the results of a soils inspection at the location above referenced which I performed on this date. Specifically, we are looking to verify that all organ- ic soils had been removed from the proposed building pad area and that the structure will rest upon naturally occur- ring mineral soil capable with a reduced likelihood of set- tlement after construction in completed. Of course, the method of investigation that would provide the greatest degree of confidence in test results is a com- plete set of penetration borings. However, as this would in- volve at least a week's delay in the project and a cost of $700 , this alternative was not elected. You chose to have some hand auger borings performed instead. Arriving on the site. I found that the building pad area had already been prepared, and that some footings had beer: poured in the residence portion of the structure. The aaray.P atca had been excavated and filled, but no formwork had com- mencec. I understand that it is this garage area that caused some concern. The proposed structure sort of benches into the existing sloped terrain. Normal topsoil and what appears to be firm mineral subsoil can be seen on excavation wails -n upsl;;pe areas. 1 commenceb several hard auger borings in the g�rsge pad area, in a pattern likely to be indicative of subs:,ii conditions. Logs of two representative borings are enclosed. Boring 1 is about in the center of the common wall between the garage and the residence portion. It indicates the expected gran- ular fill. to about 1-3;4' of depth. Below is a black organ- Mr Tom Terry 11 May 1968 Page 2 is silty clay, about. 9" in depth (exact thickness difficult to det.erm4,e due to transition). Basal soil appears to be a gray clad oam, becoming lighter in color with depth. ether t . were performed in the central and outer por- tion of garage pad area. Boring 3 is rather represernta- tive of what was found. It indicates the sandy fill, to 2.5" of depth. At this point commences a dart: gray clay loam. a very borderline soil due to its color and the trace of or- ganics. Again. color lightens with depth. being almost brown in color when the boring was terminated at 5'. Three other borings in the area indicated similar results. Groundwater is present. pr-:)bably ,Just below the bottorr: :,f the fill. However. 1 did n,-,t spend enough time on the site to allow water level to stabilise in any bore hole. We recommend that. at least in the vicinity of Boring 1. the organic soil should by ex^avat.ed from below foundation lev- el. The excavation should be oversized 1:1 plus one foot on each side from the edge of footing. This excvation should be "followed out' until it dissipates (tc a condi*ion represen- tative of Boring 3 results) or extends beyond the building pad area oversizing. Compacted fill should rellace the exca- vated soil. We do not recommend extending footings deeper as the subsoil appears somewhat. soft. You need the compacted fill to dissipate foundation loads. When the excavation is completed, it should be inspected to verify conformance with these ret,ommenda,.ions. This can be done by the City building inspector or our associates at In- stant Testing Company. Enclosed is a sheetd,�-t.ailing the limitations of this type of investigation. Particularly note that. the site is not warranted ag.sinst loss cue to soil conditzon!s. ever: if tnese recommendations are followed. Also be advised that we cannot certify the basal soil as having any particular allowable iVl:tlCl.Yl.lvil bearing capacity. ':'his is due to the very limited testing authorized. An inv^ice for c-ur servic-es is. er:clased. Not.Y that. in lig::t. of your assisting me. only tw-j borings. the rines repvrte . are invoiced. Mr Tom Terry 11 May 1988 Page 3 If you have any questions on this or any other matter. or if we may be of service in any additional capacity, do not hesitate to contact us at your convenience. Sincerely. ALLIED TEST DRILLING COMPANY Patrick J Hi nP . t'F President. encicsures cc: City of urono PH ALLISO TEST 39I:LIN3 C7MDANY Attachment to Soils 9eport METHOO Oe INV'STIGATION AUGER WRINGS Allied Test Orilling Company uses a number of vmris- tions of methods of investigation by sugar borings to de- termine soil profile. Most commonly, the power flight sugar (FA) method is employed. Sometimes a hand operated sugar (MA) is used. Refer to the wain body of the report and to the boring logs for an indication of the -:-.hod chosen. Requirements for these invastiget. . ire outlined in ASTM 0,1452, "Soil Investigation and Sampling by Auger Bor- inge•'. In the power flight auger procedure, a 6" diameter solid stem helical flight auger is advanced into the ground by mechanical/hydraulic means and withdrawn at appropriate intervals. Nature of subsurface soil is determined by ob- serving and sampling disturbed material found on the flight sugar. Representative samples are retained, sealed, and stored for future testing or reference, if nacmu sary. After cleaning the auger, it is inserted into the bore hole again and the process is repeated until the desired testing depth Is accomplished or until refusal (failure to advance the auger duo to bedrock, detached boulder, hardpan, etc,) oc- curs. A log of each boring is kept noting date, depth of changes in strata, description of soil in each major strat- um, groundwater conditions, and other date. The hand operated super procedure is the some as above, except that the ill to 3" auger is advanced into the ground by hand means. This type of boring is usually re- served for investigations to a shallow depth in an area fairly inaccessible by machinery. (over, plans*) Method of Investigation (aont'd) Unless otherwise specified, no tests upon inplace •oil, such as for compaction, percolation, etc., were per- formed except, in some instances, to note the rats of drilling (a general indication of inplace compaction). Soil Classification Soils were classified by field personnel and verified by the Soils Engineer according to the Minnesota Department of Transportation (Mn/DOT) trioxial chart. A reproduction of this chart showing composition by grain size percentages of the various soil class types is attached to this report. Groundwater In order to establish the possible oecurenee of ground - avatar in the region of testing, one or more of the boring holes were allowed to stand for a period of time, that peri- od depending on the free -draining nature of soils encounter- ed, and then checked for standing water or cave-in prior to backfilling. In addition, soil samples were checked for mottling (discoloration the result of oxidation in water fluc+istion zone) and saturation. However, because of the nature of soil and due to va- ricus meteorological and geological influences which occur over a large area and time span and which can affect the its, an accurate measurement of the highest annual ground - :star or range in fluctuations thereof usually cannot be detsrmined in the time frame and scope allowed for most investigatinne. Observed water levels, if any, are Indica- tive of groundwater at the time of testing only. IP,MM+:Y^•.IOiMiR�M!�A7w'F!nn.�sr. :�'P,T'w.:�.°`�!"'" Attachment to Soil Investigation Report ALLIED TEST DRILLING COMPANY CLAY 100% 0� to 00 �0 70 g CLAY `0 so g' SANOV CLAY SILTY CLAY 30 CLAY LOAM SILTY CLAY LOAM SANDY CLAY LOAN m aNt �c 4 (O SANDY LOAM V SILT LOAM \ 61.91I11v blast -IC J G ff '1 1L 8c� Z fc!• O Oti Ov 04 O~ a Ov TEXTURAL CLASSIFICATION OF SOILS From: Mn/OOT Grading 6 Base Manual Figure B 5-S92.603 Note: The term "Loam" refers to a particular mixture of sand, silt, and less than 20% clay. Adjectives describe the predominating material(s) in a loam. AASHTO Gradation specifications: Gravel 2.Omm+ Sand 0.074 - 2.0 mm Silt 0.005 - 0.074 mm Clay less than 0.005 mm ALLIED TEST DRILLING COMPANY PROJECT: 88071 - 1580 Fox Street, Orono, Minnesota LOG OF BORING NO: 1 Garage/Residenca common DEPTH SURFACE ELEVATION: SAUNA LAS i OTHER TESTS IN GEOLOGY M MIS DESCRIPTION AND CLASSIFICATION iEET # TYPE R W E grown Sand HA w/gravel, cobbles moist 1 2 Black Organic Silty Clay wet Ok Gray Clay Loam 3 wait lighter w/depth 41 Refusal - End of Boring 5 1 Bore hole left open � WATEP LEVEL MEASUREMENTS- DRILLING DATA aft ff11E gAuPaD DIP" CASMC. 09 "N CAW-111 W PTN OAILLING BUD L#V2L WATIN Lsnu Cmw ChW pH - M@Med 2" Hand Auger 11 May OWN COf Omb ALLIED TEST DRILLING COMPANY PROJECT: B8O71 - 1580 Fox Street, Orono, Minneosta LOG OF BORING NO: a Central portion DEPTH SURFACE ELEVATION: f GEOLOGY N MID $A.M'LE LAD E DER TESTS FEET DESCRIrTION AND CLASSIFICATION 1#jTvMW1A,1W1DE0ik+.1 Brown Send Teo Pit moist vels cobbles m 1 mo Ok Gray Clay Loam w/tr organics T 2%1 HA Gray Gray -brown End of Boring - No Refusal Bore hole left open DATE I TIME 11 Ma WATER LEVEL MEASUREMENTS GAM►LEG CA$IkG CAVE-IN IDAILLIMr.1 MMTiek ofPTM D=ITM DEvTrt UC LEVE LtVEL DRILLING DATA Crew Chot pH Method '" Hand Auger l0rit0 Completed 5 - 1 1- 88 ALLIED TEST DRILLING COMPANY PROJECT: Boring Log Key LOG OF BORING NO: DEPTH SURFACE ELEVATION: GEOLOGY N MIS SAMPLE LAB i OTHER TESTS FEET DESCRIPTION AND CLASSIFICATION I I I * I TYRE I R I W E ,H 1 Z Visual Classification of Soil I 4 According to Unified Soil Origin Classification Symbol Shown of Soil s in Parentheses s Number of Hammer Blows to Drive Split Spoon One Foot s (duel values indicate each 6" increment) 10 Indicates By 11 Y = Yes N = No 12 if Soil is Water Bearing 13 i Water Level 1-4- it I Liquid Limit 6 Plastic Limit Dry Density of Soil in Pounds Per Cubic Foat I Moisture Content of Soil as a Percent of Dry Soil weight Length of Soil tin Inches) Recovered in Split Spoon Sample ndicates Zype of Sample: SS = Split Spoon £A = Flight Auger N = None WATER LEVEL MEASUREMENTS DRILLING DATA pATt TIME SAMPLED CASING CAVE-IN DRILLING WATEw OEITM DER" DE/TM UD LEVE LEVEL CM* Chest. Mftthw: boring Comp► ed