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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />November 13,2006 <br />Project 06-507 A <br />2007 Street Reconstruction <br />Irving Avenue Area Improvements <br />Elk River, Minnesota <br /> <br />D. Recommendations <br /> <br />The following recommendations are bas~d on our understanding of the proposed project. If <br />our understanding of the project is not accurate or if changes are made to the project scope, <br />please inform us so that our recommendations can be amended, if necessary. We have <br />included recommendations regarding earthwork and construction that may help in cost <br />estimates and aid in design. We should be allowed to review the proposed construction plans <br />to provide further detailed recommendations, if necessary. Without the opportunity to <br />review the final construction plans, the recommendations made in this report may no longer <br />be valid. <br /> <br />Utility Installation: <br />- -------- ---- -- -------..-- <br />+---- -- ----------- - --------- -----------.-- <br />We recommend that all utility pipes lay in non-organic mineral soils capable of <br />supporting the pipes. Excessive over-excavation beneath the pipes should be avoided. <br />We recommend that 2 to 6 inches of granular beddingmateriaLbe placed and compacted <br />around the pipe to aid in aligning the sanitary sewer pipe for line and grade. Granular <br />bedding beneath watermain and storm sewer pipe is not as critical. Compaction should be <br />done very carefully by hand to prevent the pipe from shifting. We recommend that the <br />backfill be compacted with a static sheep's foot roller after the backfill is 2 feet above the <br />top of the pipe. Vibratory compaction should only be used on clean sands or silty sands at <br />.-------- - -- ------ - . ...<. --- <br />.. - - - - ---------- ------ ----_. --------- .-.-..-- --- --. - --. -- <br />or below optimum moisture. <br /> <br />We recommend that excavations slope at a 1.5:1 (horizontal: vertical) ratio from the <br />bottom of the excavation to the surface. Stockpiled material should be kept at least 2 feet <br />from the edge of the excavation. This is the minimum required by OSHA. We <br />recommend all construction vehicles be kept at least 5 feet from the edge of the <br />excavation. An escape ladder should be provided at all times while workers are in the <br />excavation. All excavations must meet OSHA standards (29 CFR1926). <br /> <br />Page 5 <br />