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M,1� <br />M <br />II <br />u <br />u <br />it <br />i <br />BI <br />o <br />955 LUMBER AND TIMBER TREATMENT (INCLUDING TREATING MATERIALS). <br />(REV 5- 25 -05) (FA 6- 30 -05) (1 -06) <br />SECTION 955 (Pages 867 -869) is deleted and the following substituted: <br />SECTION <br />TIMBER <br />(INCLUDING TREATING MATERIALS) <br />955 <br />TREATMENT <br />955 -1 General. <br />The work specified in this Section is the treating of structural timber, timber piling <br />and timber posts. The method of treatment for all such timber materials shall be in <br />accordance with the American Wood Preservers' Association (AWPA) Use Category <br />Standard (USC) - U1, with the exceptions and additions as specified herein. <br />955 -2 Preservative. <br />955 -2.1 Salt or Brackish Water Use: The treating of Southern Yellow Pine (SYP) <br />lumber or timber for use in salt or brackish water environments shall be done with <br />Chromated Copper Arsenate (CCA). <br />955 -2.2 Above Ground or Ground Contact and Fresh Water Immersion Use: The <br />treating of SYP lumber and timber for above round or ground contact and fresh water <br />immersion applications, shall be done with Copper Azole -Type B (CA-13), Amine Copper <br />Quat -Type D (ACQ -D), or CCA, with the following exceptions: <br />Treatment of the wood products of the pedestrian bridges, wood rails at <br />buildings or rest areas, and fence posts shall be done either with Copper Azole -Type B <br />(CA-13) or Amine Copper Quat -Type D (ACQ -D). <br />955 -3 Process. <br />All timber and lumber items shall be treated in accordance with standard T1 of the <br />AWPA manual. <br />955 -4 Requirements for Preservative Materials. <br />Amine Copper Quat -Type D (ACQ -D), Chromated Copper Arsenate (CCA), Copper <br />Azole -Type B (CA-13), Ammoniacal Copper Zinc Arsenate (ACZA) shall be in accordance <br />with AWPA P5. <br />955 -5 Requirements for Retainment. <br />955 -5.1 Piling :A minimum of 2.501b/ft3 [40.1 kg /m3] of CCA oxides shall be <br />retained in zone 1, outer 0.50 inch [ 12.7 mm], and 1 .5 lb/ft' [24.0 kg /m3] in zone 2, outer <br />0.50 to 2 inches [12.7 to 51 mm]. <br />If ACZA is used, a minimum of 2.50 lb/ft' [40.1 kg /m3] shall be retained in <br />zone 1, outer 0.50 inch [ 12.7 mm], and 1 .5 lb/ft' [24.0 kg /M3] in zone 2, outer 0.50 to 2 <br />inches [12.7 to 51 mm]. <br />955 -5.2 Structural Timber and Sheet Piles: When installation is not in a salt (or <br />brackish) water environment, the minimum retention shall be 0.60 lb/ft' [9.6 kg /m3] of <br />CCA or ACQ -D or 0.31 lb/ft' [5.0 kg /m3] CA -B, as determined by cores from the outer <br />0.60 inch [ 15.2 mm]. When installation is in a salt (or brackish) water environment, a <br />March 2007 01000 -184 03- 4122.D <br />