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Home My WebLink About1994-10-26 Soil Test ReportBRAUN' I NTE RTEC October 26, 1994 Ms. Teresa Whaley Home Reflections 1340 Phillips Drive Long Lake, MN 55356 Dear Ms. Whaley: ,7 1994 .,�, tt,r.,,.� ca,p„amiw 6801 Washington Avenue South P.O. Box 39108 Minneapolis, Minnaola 554394108 612.941.5600 Fax: 941.4151 Engineers and Scientists Serving the Built and Natural Environments` Project BABX-94-463 Re: Excavation Observations and Compaction Testing, Proposed House at 1090 Cox Farm Road, Shadowwood Subdivision, Orono, Minnesota As you authorized on June 28, 1994, we have performed excavation observations and compaction testing during pad preparation for a house pad in the Shadowwood subdivision in Orono. The purpose of the observations was to assist in determining the suitability of site soils for support of a proposed house and attached garage. The purpose of our compaction testing was to assist in evaluating the compacted density of fill placed below footings. Proposed Construction We understand the house will have a full basement with a walkout. The garage is located along the west side. We understand the house will be of mostly wood -frame construction, and have assumed foundation bearing pressures will not exceed 2,500 pounds per square foot. Excavation Observations Observations were performed on June 28 and 29 and July 1, 1994. At the time of the initial observation, the house pad had been excavated to roughly the proposed footing grades. As part of the observations, hand auger probes to depths of about 3 to 4 feet below the excavation bottoms were performed. Estimates of soil consistency were made based on the force required to advance the auger. Classifications were determined in general accordance with American Society for Testing and Materials (ASTM) procedures by examining the auger cuttings. Initial observation consisted of hand auger borings and two test pits. The test pits were excavated and observed outside of the limits of the proposed house pad. Results of the test pit observations and hand auger borings indicated that existing soils at proposed footing elevations were not suitable for support of the proposed house and garage without incurring an Home Reflections Project BABX-94-463 October 26, 1994 Page 2 unacceptably high risk of structural distress due to differential settlement. We recommended the disturbed, soft or loose sands, silts and clays be excavated and replaced with engineered backfill to provide a pad suitable for support of the house and garage. We also recommended a smooth -bucket backhoe perform the excavating in order to minimize further disturbance of the underlying natural but saturated soils. Excavation to suitable soils was performed on July 1, 1994. Unsuitable soils were excavated to depth from about 5 to 10 feet below existing site grades. Based on information we were provided, this elevation was about 5 feet below the proposed basement footing elevation. After unsuitable soils were excavated, the bottom soil observed was sandy lean clay glacial till judged to be medium to rather stiff in consistency. A minimum of 10 feet of excavation oversizing was provided beyond the proposed outside edges of perimeter footings. Excavation oversizing was judged adequate. Compaction Testing Four compaction tests were performed in compacted backfill. Soil used as backfill was imported poorly graded sand with silt. It was compacted using a smooth -drum roller. Results of all compaction tests exceeded the recommended minimum of 95 percent of the maximum dry density determined in accordance with ASTM Test Method D 698 (standard Proctor). Compaction and Proctor test results are attached. Conclusions Our conclusions are based on the results of our excavation observations and compaction testing, and information we were provided regarding the proposed construction. Based on this, it is our opinion excavation bottom soils observed are suitable for support of backfill and the proposed construction. It is also our opinion that adequate excavation oversizirg was provided. Based on compaction test results, it is our opinion backfills were compacted to densities exceeding the recommended minimum of 95 percent of standard Proctor density at the locations and elevations of the tests. General Standard penetration test borings with power equipment were not authorized nor taken in the building area to evaluate the soils at depth. However, the soils which were visible and the Home Reflections Project BABX-94-463 October 26, 1994 Page 3 results of the hand auger probes indicate that the risk of detrimental settlement due to poor soils at depth is small and we thus recommend it be assumed by the owner. Services performed by Braun Intertec for this project have been conducted with that level of care and skill ordinarily exercised by members of the profession currently practicing in this area under similar budget and time restraints. No warranty, expressed or implied, is made. It has been a pleasure providing our services for you. If you have any questions, please call Greg Glitto at (612) 942.4841. Sincerely, p U� 4i6— Gregory J. Glitto Staff Engineer Professional Certification I hereby certify that this report was prepared under my direct supervision and that I am a duly Registered Professional Engineer under the laws of the State of Minnesota. LL\/,-//21 . Braun, PE Senior Engineer Registration Number: 14969 Attachments: Reports of Field Compaction Tests 1 through 4 Proctor P-1 c: Mr. Bruce Vang City of Orono drt\&\Iwb: mjz%ab x\94463 \obupt BRAUN sm I NTE RTEC Report of Field Compaction Tests Date: July 12, 1994 Client: Ms. Teresa Whaley Home Reflections 1340 Phillips Drive koun h- ma floc CwporeMon 6801 Washington Avenue South P.O. Box 39108 Minneapolis, Minnesota 55439-0108 612.941.5600 Fax: 941.4151 Engineers and Scientists Serving the Built and Natural Environments Project: BABX-94-463 Report: I Project Description: County Road 6 and Willow Shadowood Subdivision Orono, Minnesota ayss Test L4AY, 1.{11 Date ✓✓✓✓v Type Soil ID and Classification Optimum Moisture* M Max. Lab Dry Density* (Std.Proc.) (pct) Inplace Moisture M Inplace Dry Density (pcf) Relative Compaction M Specified Minimum Compact. M Comments 1 7/6/94 N P-1: SP -SM 14.5 109.5 11 118 108 95 A 2 7/6/94 N P-1: SP -SM 14.5 109.5 7 113 103 95 A 3 7/6/94 N P-1: SP -SM 14.5 109.5 6 112 102 95 A 4 1 7/6/94 N P-1: SP -SM 14.5 109.5 6 113 103 95 A Key: N = Nuclear, ASTM D 2922 A = Test results comply with specifications. SC = Sand Cone, ASTM D 1556 B = Test results do not comply with specifications. * = O.M. and M.L.D.D. rounded to nearest 0.5 Test Test Location Elevation 1 38'S, 56'E of NW House Pad Corner 99 2 12'S, 48'E of NW House Pad Corner 98'h 3 35'S, 15'E of NW House Pad Corner 99 4 15'S, 2'E of NW House Pad Corner 98 Elevation Reference: Assumed elevation of bottom of basement footing = 100. cc: Mr. Bruce Vang City of Orono mkm\babx\94463\ct. l Braun Intertec Corporation .1� Az Daniel R. 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As Received, Preparation Rammer Depth Tested Size of Percent Percent Percent I Percent Natural Specific Oversize Oversize on 3/4 3/4 to 3/8 3/8 to 44 Moisture Gravity TEST RESULTS MATERIAL Maximum dry density - 109.5 PCf SP—SM Poorly Graded Sand moisture - 14.5 % w/silt fine grain, brown _____O_ptimum Proje=t No.: BABSubdivision Orono, Minnesota assumed. Date:Location: RELATIONSHIP BRAUN