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M05003MT <br />• event any unusual or unexpected conditions are encountered. The <br />cost of the geotechnical engineering observations and material <br />testing during construction or additional engineering consultation <br />is not included in the fee for this report. We recommend that your <br />construction budget include site visits early during construction <br />schedule for the project geotechnical engineer to observe <br />foundation excavations and for additional site visits to test <br />compacted soil. <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 />regarding this concept please contact us. <br />~l It is difficult to predict if unexpected subsurface conditions <br />1l 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 />4.1 Structural Fill Quality <br />It is our understanding that the gob pile development will <br />include compacted structural fill. The quality of compacted <br />structural fill will depend on the type of material used as <br />structural fill, fill lift thickness, fill moisture condition and <br />compactive effort used during construction 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 and periodic strength tests of the fill <br />material to verify the material suitability for use as structural <br />fill. As the material is placed the in-place moisture content and <br />dry density are tested to indicate the relative compaction of the <br />placed structural fill. We recommend that your budget include <br />provisions for observation and testing of structural fill during <br />construction. <br />7 <br />3itam6ert anD ~,s',oociates <br />CONSULTING GEOTECHNICAL ENGINEERS ANO <br />MATERIAL TESTING <br />