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B A cAMERICAN ENCIVEEIING <br />TESTING. INC. <br />CON>lllAMS•OlCnCHMCAl• \t AimiAtS <br />• ESAIROSAUM Al <br />October n. 1994 <br />Mr. Dale Gustafson <br />Gustafson Design. Ific. <br />1845 Wisconsin Avenue North <br />Golden Valley, MN 55427 <br />l^taimng Walls and Shore Ih-otcction Rccommcrdaiions <br />Lear Residence <br />2525 Dunwoody Avenue <br />Orono, Minnesota <br />AET 4f94-1943 <br />Dear Mr. Gustafson: <br />This report presents our opinions and recommendations concemmg design and construction of <br />new shore protection and backyard retaimng walls at the referenced project site located along <br />the east shore of Spring Park Bay on Lake Minnetonka. You authonzed our services on <br />September 16, 1994. <br />PROJECT INFORMATION <br />Based on information furnished by you, the project will consist of constructing a system of <br />retaining walls between the existing house and Lake Minnetonka shoreline. New shore <br />protection along the lake is also planned. The currently-planned reuimng wall layout is shown <br />on the attached copy of a plan drawing you furmshed to us. <br />The proposed retaining walls consist of stone facing with geogrid-reinforced earth behind the <br />facing. Wall height will be a maximum of about 7'. A Lannon-type stone material is proposed <br />for the wall facing. This stone consists of rectangular pieces of limestone with dimensions <br />varying from 4” to 12" high, 12" to 18" long, and 12" deep (from front to back of facing). The <br />stone piece surfaces are Hat and achieved by fracturing the stone, so there is moderate roughness <br />to the stone suriaces. <br />Lake shore protection on your project site currently consists of scattered cobbles and boulders <br />up to about 12" in diameter. Typical shore protection for adjacent properties consists of large <br />(up to 4' in diameter) irregular field stone boulders fitted in place. It appears the boulders <br />extend from 4' to 5' above the present lake level to about 2' below lake level. We understand <br />these adjacent shore protection nprap systems have been in-place for ten years or more. During <br />our site visit, it appeared those adjacent riprap systems were in excellent condition. <br />AN AFFIRMATIVE ACTION EMPLOYER" <br />2102 Unlftnity Ar«. Ht • St. Paul, MN S5114 » €12 959 9001 • Fax 512-559-13T9 <br />44J1 Wet! Stre«t. Suit# §4 •Duiutf' MN 5580? • Ji8-628-t5l0 628-t5S0 <br />t730F*»jl Av#nu« .Ma^nato MN 56001 .507 387-2222 .Fai 507-387-6999