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M03106GE observe the toe key excavation and benching operations and subdrain construction and to test compacted soil and gob materials. We recommend that the observation and material testing services during construction be retained by the owner or the owner's engi- neer, not the contractor, to maintain third party credibility. We are experienced and available to provide material testing services. We have included a copy of a report prepared by Van Gilder Insur- ance which discusses testing services during construction. It .is our opinion that the owner and engineer be familiar with the information. If you have any questions regarding this concept please contact us. We suggest that your construction plans and schedule include provisions for geotechnical engineering observations and material testing during construction and your budget reflect these provi- sions. It is difficult to predict if unexpected subsurface conditions will be encountered during construction. Since such conditions may be found, we suggest that the owner and the contractor make provi- sions in their budget and construction schedule to accommodate unexpected subsurface conditions. • 5.1 Structural Fill Quality It is our understanding that the proposed development may includA compacted structural fill. The quality of compacted structural fill will depend on the type of material used as structural fill, fill lift thickness, fill moisture condition and compactive effort used during construction of the structural fill. Engineering - observation and testing of structural fill is essential as an aid to safeguard the quality and performance of the structural fill. Testing of the structural fill normally includes tests to deter- mine the grain size distribution, swell potential and moisture- density relationship of the fill material to verify the material suitability for use as structural fill. As the material is placed the in-place moisture content and dry density are tested to indi- cate the relative compaction of the placed structural fill. We recommend that your budget include provisions for observation and testing of structural fill during construction. Testing of the compacted fill material should include tests of the moisture content and density of the fill material placed and compacted prior to placement of additional fill material. We suggest that a reasonable number of density tests of the fill material can best be determined on a site, material and constructi- on basis although as a guideline we suggest one test per about each 300 to 500 square feet of each lift of fill material. 9 ~iLam6ert ana ~,s~,ooeiate~ CONSULTING GEOTECNMIL~L ENGINEERS •MG M~TERI~L TESTING