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STS Consultants,Ltd. voice 763-315-6300 10900 73rd Avenue North,Suite 150 fax 763-315-1836 STs CONSULTANTS Maple Grove,Minnesota 55369-5547 web w�ww.stsconsultants.com June 24, 2003 ij-7S3 ti Minnetonka Custom Homes 2950 Island View Drive Mound, MN 55364 Attn: Mr. Bob Pieper Re: Subsurface Exploration and Slope Stability Analysis for Single Family Dwelling Located at 4753 North Shore Drive in Orono, Minnesota; STS Project 99189 Dear Mr. Pieper: You have demolished a former house at this address, and are planning to construct a new, larger house. The City of Orono has requested that you address the stability of the slope adjacent to Lake Minnetonka. Our services for this project were performed in accordance with the project scope outlined in our proposal dated June 4, 2003. This work was authorized by Mr. Steven Sexton on June 6, 2003. The purposes of this exploration are to: • Perform a subsurface exploration and field testing program consisting of two soil borings to depths of 30 and 50 feet. • Describe the soil and groundwater conditions encountered in our exploration. • Perform appropriate soil laboratory tests to determine the shear strength and physical properties of the soil within the potential sliding zone. • Perform a slope stability analysis for this particular lot, including consideration of the loads imposed at the top of the slope by the new house footings. • Prepare a written report of our findings. Procedure STS recommended the testing program necessary, and selected the boring locations and depths. An STS engineer staked the boring locations in the field, by measuring from the property lines, using the survey plan provided by Demars-Gabriel Land Surveyors Inc. dated April 11, 2003. The approximate boring locations are shown on the Soil Boring Location Diagram in the Appendix. The ground surface elevations at the borings were determined by our drill crew, with reference to the pavement abreast of the northeast property corner. The elevation of this reference point or benchmark was shown to be 990.9 feet National Geodetic Vertical Datum, on the survey plan. We drilled the borings on June 11, 2003 with truck-mounted drill rigs operated by a two person crew. We followed standard soil sampling procedures, and also obtained undisturbed thin-walled tube samples for laboratory strength testing. Recovered soil samples were described on field logs, containerized, labeled and transported to our laboratory for further examination and testing. The field logs also document sample intervals, test data, observations of drilling resistance, groundwater occurrence and other pertinent conditions. After the final groundwater level observations, we backfilled the borings with high solids bentonite grout, to conform to Minnesota Department of Health regulations. IN -a a az: