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2. ASTM D1556, "Test Method for Density of Soil In Place, Sand-Cone Method." <br /> 3. ASTM D2922, "Test Methods for Density of Soil In Place by Nuclear Methods." <br /> 4. ASTM D2488, "Standard practice for Description and Identification of Soil-Visual <br /> Manual Procedure"(Unified Soil Classification System-USCS) <br /> 5. AASHTO: "American Association of State Highway and Transportation Officials" <br /> 1.5 UNIT PRICE <br /> A. Unit cost per linear foot of trench length for 12" deep additional excavation and offsite <br /> material disposal and placement of pipe trench stabilization when recommended by testing <br /> laboratory representative. <br /> 1.6 TRENCHING TERMS <br /> A. Stabilization Aggregate: Crushed rock material for use for correcting an unstable trench <br /> subgrade. <br /> B. Pipe Bedding: Soil material placed in the trench to form a foundation for the piping. <br /> C. Initial Backfill: Soil material placed over the pipe bedding and around the pipe to a level of <br /> 12" above the top of the pipe. <br /> D. Select Trench Backfill: Backfill material above the initial backfill when the trench is under <br /> buildings or pavement areas. Pavement areas include bituminous and concrete or similar <br /> surfacing. <br /> E. General Trench Backfill: Trench backfill as applicable to lawn or landscape areas.. <br /> F. Duct Backfill: Material placed under and around underfloor ductwork. <br /> G. Type V Geotextile: A geotextile used for stabilizing trench subgrade. <br /> PART 2 PRODUCTS <br /> 2.1 MATERIALS <br /> A. Stabilization Aggregate: <br /> 1. The material shall be 100%crushed quarry rock, gradation per ASTM C33, Size No. <br /> 4. <br /> B. Bedding: <br /> ADDENDUM#1 <br /> 1607.001 -ORONO ICE ARENA(CP-2) Page 02220 -2 <br />