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Home My WebLink About1976-08-05 Soil Boring Report. LOG OF BORINGS =------_ PROJECT: 76-301 Preliminary Soil Borings DATE: ► 8/5/76 Fairview (Co. Rd. 84) SCALE' 1"-4' —y Orono, Minnesota BORING: B-1 LOCATION:120-W, 180' BORIN : B-2 LOCATION:60'E, 90' S. of N.E. corner Lot N. of S.W. corner Lot URF.E EV• SURF. �956.0 11, Block 1.3, Block 3. Depth Description o Materials D 48A WL Deoth Descrl tion of Materials a WL SILTY SAND, fine to medium- SM a . SANDY CLAY, fine to medium - grained, brown, moist. grained, brown, moist to CL (Coarse Alluvium) wet. (Till) i Ile 12 SAND, slightly silty, fine to medium -grained, brown, p- met. (Glacial Outwash) 1d.S 18.5 i *(Topsoil) ' Water level down 11' immediately after withdraw* :later level down 18.5 , of auger. Immediately after withdrava of auger. i • i 1 , t . �� prod/ �clivno> K 76-301 Johnson & Peterson, Inc. �4- August 16, 1976 Percolation tes P-2 3, 4, and 6 indicate individual absorptivities o or 240 mpi. These values are outside the limits for typical individual sanitary sewer systems. Unless additional investigations would reveal more absorptive soils in other areas of these lots, specifically designed systems would be necessary to meet individual requirments and provide a system to function satisfactorily. Of necessity, the area of the power auger borings and percolation tests in relation to the area of the subdivi- sion and the depth of the borings are limited. Suggestions and/or recommendations of this report are opinions based on the data obtained from the borings. If we can be of further assistance in evaluating these data, taking additional borings or percolation tests, kindly contact us at your convenience. Very truly yours, B ENGINEERING TESTING, INC. ennis N. Rie chel E_ngineeri� Assistant Braun, P.B. i resdent D14R/JSB: skf ........�.M M 111.. ...•^w .M ..�wwwNwn A....n.-... 76-301 Johnson $ Peterson, Inc. August 16, 1976 does not appear that the groundwater levels were completely stabilized atthe time the water level checks were made. Also, some of these are possibly "perched" water levels. Water levels should be expected to show normal seasonal and annual fluctuations. aercolation tests indicated soil absorptivities, in minutes per inch (mpi) as follows: Test # P-4 P- 5 P-6 Surface Soil At Elevation Test Depth Rate (mpi) 9SS.0± Clayey San 240 953.01 Clayey Sand (SC) 240 978.Ot Clayey Sand (SC) 48 943.S± Sandy Clay (CL) 240 Preliminary Recommendations: You have indicated that current plans call for developing this site as a single family, residential area. Lot sizes currently planned are on the order of 2 acres with each dwelling having an individual sanitary disposal system. Borings were taken generally in the low areas across the site and provide preliminary information relative to the general soil types encountered in this area. The borings did not encounter any highly organic soils such as peat or muck, how- ever, a black mineral soil was encountered to a depth of 3 feet in boring B-7 which was put down in a low area near the southeast corner of the site. Power auger borings do not provide information relative to the strength parameters of the various soil types encountered, however, mineral soils of the types brought to the surface by the auger generally are of sufficient strength to support single family dwellings without detrimental settlement. Black mineral soils are likely quite soft and would not provide an adequate foundation. For any houses in low areas soft black soils will likely have to be removed in their entirety from building areas. There is considerable variation in the results of percola- tion tests conducted. Percolation test 11, which was conducted in a more sandy material, was found to have a percolation rate Of S mPi, which indicate that the soil in this area can absorb water relatively quickly. Results of percolation test P-S put down in a more eoliesive soil, indicates that these soils are less permeable with a rate of 48 mpi, however, a percolation rate of this magnitude would be considered acceptable. 76- 301 Johnson 4 Peterson, Inc. -2- August 16, 1976 Mineral soils encountered in the borings were classified in accordance with the Unified Soils Classification System. A copy of that chart is attached. Representative samples of the soils brought to the surface by the auger will be retained in this office for a period of 60 days to be available for examination. Percolation tests were run in 6-inch diameter holes, drilled to a depth of 36 inches, in accordance with the procedures normally used on lots that will be developed residentially. In accordance with standard procedures, the holes were permitted to soak overnight before conducting the tests. Each of the borings was probed immediately after completion to check for the presence of groundwater. Results: The Log,of Soils encountered in the borings and the water level observations are shown on the attached Log of Boring sheets. Boring B-1 encountered brown, silty sand overlying slightly silty sands to the respective termination depth of 18h feet. Borings B-3 and B-4 typically encountered a sandy clay to a clayey sand overlying a stratum of slightlyy silty sand to silty s nd at or near the termination depth of the borings. orings B- nd B-S through B-8 all encountered a dark brown tu uxacx silty sand to depths on the order of 2 to 6 inches and then encountered strata of verying thickness and depths of sandy clay and silty clayey sand glacial till tn the._-__-'oo termination depth of each of these borin4Sn A black sandy boring B-7. In probing the borings immediately after completion, ground- water was not encountered in borings B-S a r was encountered at a depth of 11 feet in B-1, 18h feet in - and B-4, 1Z% feet in B-3, 9h feet in B-7 a in B- . B. A fairly large swampy area and Lake Minnetonka are :ocated at the southwest edge of the property. The contour elevation of the edge of this swamp to be roughly 930!. It then appears from this information that the groundwater table over the area under investigation would be above elevation 930. In boring B-1, water was encountered at an elevation of 94S. In boring B-4, water was encountered at elevation 934.5. There is considerable variation between these water level readings. Because of the cohesive nature Of the soils encountered, considerable time is required in order for the groundwater to stablize in the borings. It An Expansion of Soil Engineering Services, Inc. J \ ENGINEERING TESTING MINNEAPOEIS/ST. PAUE UN S. Corntr Rd.11. P.O. BOX 35101. Molt,. MO. $54351012•941.5600 NORTHERN MINNESOTA 3211 E.11th Avenue. Hi11iA1. Mo. $57441211.263•I141 L t MAIIN F. 1.. F Pbag* P. ILAmason. uw Aw ar..r.. & • AAIAt P. I.. Vks Ara LV w. 9 a L we"NM ►.1, Nr AWL rAWq August 16, 1976 Let- 3 �_ zbcg. 3 Johnson & Peterson, Inc. 18104 Minnetonka Blvd. Wayzata, MIN 55391 Attn: Mr. Terry Johnson Mr. Johnson: �h-,e ✓/ EW Re: 76-301. PRELIMINARY SOIL BORINGS $ PERCOLATION TESTS Fairview (County Road 84) Orono, Minnesota As requested, we have recently conducted a preliminary soils investigation consisting of 8 power auger borings and 6 percolation tests. The borings were taken to determine the general soil and water conditions over the above referenced subdivision. The percolation tests were conducted to provide preliminary information relative to the soil absorptivity rates. The borings and percolation tests were taken at the locations shown on the attached sketch. Field locations were dete-mined by topographical features shown on the topographical survey provided by you. Surface elevations were interpolated from the contour elevations shown on this survey. Investigation Methods: The power auger borings were completed using a CME-4S truck - mounted power auger unit. The soil classifications and depths as shown on the attached Logs were inferred from the soils brought to the surface by the continous flight feature of the auger. The depth of strata changes is thus considered approximate. C(HOVNTING FNA1NFFNQJ90111 AND MATFNIU! LOG OF 136RING S . PROJECT: 76-3U1 Preliminary Soil Borings DATE: 8/S/76 ' Fairview (Co. Rd. 84) Orono, Minnesota SCALE: 1"W BORING: B-1 LOCATION:120'w, 180' BORIN : B-2 LOCATION: 60'E, 90' U R .E EV• S. of N.E. corner Lot SURF. ., of S.W. corner Lot 956.0 11, Block 1.3, Block 3. Depth Description o Materials D 48 WL Deot Descry tion of Moterials � WL SILTY SAND, fine to medium - grained, brown, moist. SH SANDY CLAY, fine to medium - grained, brown, moist to CL (Coarse Alluvium) wet' (Till) Lei Yo 12 18.5 SAND, slightly silty, fine to medium -grained, brown, vet. (Glacial Outvash) Water level down IV immediately after vi of auger. 18.5 •(Topsoil) Water level down 18.5' Immediately after vithdr of auger.