Laserfiche WebLink
� � �" <br /> , , , <br /> , �/ickery �,n�ineerin� F,• onsultin .��, LLC <br /> 14�4�4�I ��i��.��e�+'��ooc�ti�rive,�t�en Prairie,M� 55i4i-�5�9 <br /> �hone: ?�2-4r5-SZ'2 �:�x: 9;�2-42r-19�1 <br /> ivi c ke ryFavi c�:e ry c nY�.com <br /> March 21, 2014 Project VEC 14-067 <br /> Mr. Brian Butterfield <br /> B. Butterfield Landscape Company ��r,n I^ � <br /> 3925 Watertown Road �/"'�y XJU/ l. <br /> Orono, MN 55359 ����� <br /> Dear Mr. Butterfield: �� <br /> Re: Boulder Wall Observations and Evaluations, 3625 Eileen St, Maple Plain, Minnesota <br /> As you requested, Vickery Engineering and Consulting, LLC, (VEC), has completed the <br /> observations and evaluation of the boulder retaining walls at the referenced location. We are <br /> writing this letter to present the findings of our observations and evaluation. <br /> Background Information <br /> Three boulder retaining walls were constructed at the referenced site. Boulder Wall Plans were <br /> not prepared as part of this project. <br /> Observation Results <br /> On February 14, 2014, VEC performed observations of the boulder retaining wall at the site. <br /> Site observations included visual observations of the boulder retaining wall and measurement <br /> with a tape measure only. Survey measurements or use of other instruments were not performed. <br /> The results of the visual observations performed are summarized below: <br /> • The boulder wall has positive batter. <br /> � Filter fabric was placed behind the boulders. <br /> • The walls ranged from about 1 foot to 5 feet tall(total height), with an additional 1/2- to <br /> 1-foot of wall below grade. <br /> • The boulder sizes ranged from about 2 1/2 feet deep (perpendicular to the wall face) at <br /> the bottom to about 1 1/2-foot deep at the top. <br /> Evaluation <br /> The tallest cross-section of each boulder wall was evaluated. The evaluation was based on the <br /> Federal Highway Administration design methodology shown in their publication "Rockery <br /> Design And Construction Guidelines - FHWA-CFLTD-06-006" published in 2006. The results <br /> of the evaluation are attached. As noted, the boulder walls meet the required factors of safety. <br /> �n�ineerin��jolutions�or-an(�nsta�ile wo�d <br />