Quantcast Retention -Cont.

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treated the pentachlorophenol or waterborne preservatives. Retentions in lumber or timbers of species
not mentioned above shall be determined by gage readings.
4.2.5 In the inspection of treated plywood, penetration shall be determined by taking borings
12 inches from any edge into one face of each of not less than five panels in any lot. Borings shall be
tested for penetration by the appropriate procedure described in AWPA Standard A3. Penetration in
plywood shall be considered adequate if each veneer is penetrated For the assay of treated plywood,
samples shall be taken from not less than five panels in each lot. These samples shall be taken at a point
12 inches from any edge. Plywood 5/8 inch or less in thickness shall be sampled through the full thick-
ness. Plywood more than 5/8 inch in thickness shall be sampled from the lower grade face to a depth of
5/8 inch.
4.2.6 The determination of the amount of creosote or creosote-containing solutions in a sample of
borings shall be made according to AWPA Standard A6. The determination of the amount of pen-
tachlorophenol in a sample of borings shall be made according to AWPA Standard A5. The determina-
tion of the amounts of waterborne preservatives in a sample of borings shall be made according to
AWPA Standard A2.
4.2.7 To obtain and test a sample of oil from a marine piling for compliance with quality
requirements, AWPA Standards A8 and A1 shall be used.
5.1 This section is not applicable to this specification.
6.1 Recommended practices in the procurement and use of treated wood.
6.1.1 Tables I, II, and III are schedules of approved practices for the preservative treatment of
wood in various forms with creosote and creosote-containing solutions, pentachlorophenol, and water-
borne preservatives which are intended for Government use. The net retentions in the tables are mini-
mal. Higher net retentions may be needed for severe use conditions and should be specified, they
should also be specified for moderate use conditions whenever a product is of critical structural impor-
tance or whenever it is used in a situation where replacement would be very costly. It is recommended
that observations of penetration be made on a number of pieces selected at random from each shipment
received at destination. The presence or absence of the mark of a quality control agency or independent
inspection agency acceptable to the purchaser should also be noted. When the wood contains such a
mark and the penetration observed conforms to the specifications, the shipment may be accepted When
the penetration observed casts doubt on the quality of the treatment, a thorough inspection by either the
Government, a quality control agency, or an independent inspection agency should be made and any
nonconforming shipment or lot should be rejected
6.1.2 Coal-tar creosote, creosote-coal tar solution, creosote-petroleum solution, pentachloro-
phenol, and the four waterborne preservatives ACA, CCA Type I, CCA Type II, and CCA Type III
(Tables I, II, and III) are ordinarily to be used for wood exposed to severe exposure conditions, such as


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