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y y 38 the exposed materials are consistent with the objectives of the intended surface and foundation preparation. Any underground structures such as wells, pipelines, or others not located prior to grading should be removed or treated in a manner prescribed by the con- trolling governmental agencies. Glass or glass byproducts that are excavated from the site should be handled and disposed of, or reused, consistent with the requirements of the controlling governmental agencies. The ground surface to receive structural fill should be scarified, disced, or bladed until it is uniform and free from ruts, hollows, hummocks, or other uneven features that may prevent uniform compaction. The scarified ground surface material then should be brought to a water content that will permit proper compaction, mixed as required, and compacted as specified in the Compac- tion Requirements Section of this report. The scarified zone should be 8 to 10 inches in depth. Prior to placing fill, the ground surface to receive fill should be observed and tested. Fill Materials. Existing on-site materials that are free from debris, organic matter or glass may be excavated and used as structural fill on the site. Structural fill should be compacted in accordance with the Compaction Require- ments section of this report. From a geotechnical standpoint, it is acceptable for the structural fill to contain fragments and pieces of glass provided the following requirements are met. The fill should contain no more than 20 percent glass by volume or dry weight. The maximum size of individual pieces of glass should be 3 inches in maximum dimension. Within 3 ft of the final ground surface, the fill should be free of glass fragments that are larger than fine gravel (3/4-in. largest dimension) size. The fill material that will be more than 3 feet below the final ground surface should not contain rocks, blocky material, or lumps over 6 inches in size in their largest dimension. Nonglass particles less than 6 inches in size, in their largest dimension, may be utilized in the fill provided they are not placed in concentrated pockets and sufficient finer-grained material surrounds them. Within 3 ft of the final ground surface, nonglass particles should not be larger than 3 inches in their largest dimension. 1144A/CC-38 N McClelland