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M98168GE • the size of the larger particles, the engineering characteristics of the fine grained portion of material matrix, the moisture content that the material will need to be for compaction with respect to the existing initial moisture content, the organic content of the material, and the items that influence the cost to use the material. Compacted fill should be a non-expansive material with the maximum aggregate size leas than about two (2) inches and less than about twenty five (25) percent coarser than three quarter (3/4) inch size. The reason for the maximum size is that larger sizes may have too great an influence on the compaction characteristics of the material and may also impose point loads on the footings or floor slabs that are in contact with the material. Frequently pit-run material or crushed aggregate material is used for structural fill material. Pit- run material may be satisfactory, however crushed aggregate material with angular grains is preferable. Angular particles tend to interlock with each other better than rounded particles. The fine grained portion of tht fill material will have a signifi- cant influence on the performance of the fill. Material which has a fine grained matrix composed of silt and/or clay which exhibits expansive characteristics should be avoided for use as structural fill. The moisture content of the material should be monitored during construction and maintained near optimum moisture content for compaction of the material. Soil with an appreciable organic content may not perform adequately for use as structural fill material due to the compressibility of the material and ultimately due to the decay of the organic portion of the material. C4 .0 RADON CONSIDERATIONS Information presented in "Radon Reduction in New Construction, An Interim Guide: OPA-87-009 by the Environmental Protection Agency dated August 1987 indicates that currently there are no standard soil tests or specific standards for correlating the results of soil testa at a building site with subsequent indoor radon levels. Actual indoor levels can be affected by construction techniques and may vary greatly from soil radon teat results. Therefore it is recommended that radon teats be conducted in the structure after construction is complete to verify the actual radon levels in the home. C4 ~iambert anD ~.ssoeiates COYNM1fIMD OlOTlCMMIC~I lMOIY!!Y ~YD Y~Tl111l1 Ili TIYO