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M99238GE <br />We recommend that the observation and material testing services <br />during construction be retained by the owner or the owner's engi- <br />neer or architect, not the contractor, to maintain third party <br />credibility. we are experienced and available to provide material <br />testing services. We have included a copy of a report prepared by <br />Van Gilder Insurance which discusses testing services during con- <br />struction. It is our opinion that the owner, architect and engi- <br />neer be familiar with the information. If you have any questions <br />-egarding this concept please contact us. <br />We suggest that your construction plans and schedule include <br />provisions for geotechnical engineering observations and material <br />testing during construction and your budget reflect these provi- <br />sions. <br />It is difficult to predict if unexpected subsurface conditions <br />will be encountered during construction. Since such conditions may <br />be found, we suggest that the owner and the contractor make provi- <br />sions in their budget and construction schedule to accommodate <br />unexpected subsurface conditions. <br />5.1 Structural Fi11 Quality <br />It is our understanding that the proposed development may include <br />compacted structural fill. The quality of compacted structural <br />fill will depend on the type of material used as structural fill, <br />• fill lift thickness, fill moisture condition and compactive effort <br />used during construction of the structural fill. Engineering <br />observation and testing of structural fill is essential as an aid <br />to safeguard the quality and performance of the structural fill. <br />Testing of the structural fill normally includes tests to deter- <br />mine the grain size distribution, swell potential and moisture- <br />density relationship of the fill material to verify the material <br />suitability for use as structural fill. As the material is placed <br />the in-place moisture content and dry density are tested to indi- <br />cate the relative compaction of the placed structural fill. We <br />recommend that your budget include provisions for observation and <br />testing of structural fill during construction. <br />Testing of the compacted fill material should include tests of <br />the moisture content and density of the fill material placed and <br />compacted prior to placement of additional fill material. We <br />suggest that a reasonable number of density tests of the fill <br />material can best be determined on a site, material and constructi- <br />on basis although as a guideline we suggest one test per about each <br />300 to 500 square feet of each lift of fill material. Utility <br />10 <br /> <br />~Lambrrt anD ~,sooriates <br />CONSULTING GEOTE OI+NiCAL ENG~N EEnS ANO <br />MAiE N1Al TESTING <br />