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 before installation to assure no excessive residual materials or preservative deposits exist.
Maximum chemical loading should not exceed 1.4 times the minimum retention specified for
creosote treatments and 1.25 times the minimum for arsenical salt treatments. Plans for handling
the treated wood upon dismantling of the structure should be considered in the design phase,
especially in areas where the disposal of treated wood may become restricted.
2.2.2.4 Quality Assurance. Each treated pile must be branded by the producer in accordance with
AWPA M6. An inspection report by an independent inspection agency accredited by the
American Lumber Standard Committee should accompany each pile shipment. All treated piles
should be stored and handled in accordance with AWPA M4.
2.2.2.5 Safety Requirements. Specifiers and installers must follow the guidance in the treated
wood Material Safety Data Sheets (MSDS) and hazard labels as required by OSHA and use the
product in conformance with the Consumer Information Sheet that must be provided by the
treated wood supplier.
2.2.2.6 Field Cuts and Pile Tops. Insofar as possible, all cuts that expose untreated wood should
be avoided. Where field cuts are absolutely necessary, e.g., pile tops, the cuts and subsequent
preservative treatments should be accomplished in accordance with AWPA M4. Use of sheet
metal covers for fender piles, however, is discouraged because the covers are easily tom by impact
and become a personnel hazard.
2.2.12 Sheet Piling - Timber. Timber sheet piling shall conform to the requirements in para
2.2.1.3 and 2.2.2.1 through 2.2.2.6 except as modified by para 2.2.12.1 through 2.2.12.5
2.2.12.1
Treatment. [DELETE]
2.2.12.6
Environmental Considerations. Sheet piling and bulkheads present greater
localized environmental risk because of the greater number of piles and thus greater potential
chemical loading in a given area. A site specific environmental risk assessment may be advisable.
3.1.2.2 Untreated Timber. All substructure wood components except for temporary structures
and special design plastic-covered wood structures shall receive preservative treatment. Insofar
as possible, all bolt holes and other cuts to timber should be done before wrapping or coating with
plastic. If field cuts are unavoidable, no untreated wood can be left exposed.
3.1.2.3 Preservative Treatment. Except as stated in para 3.1.2.2 all substructure timbers shall
receive preservative treatment. Treated timbers shall conform to current American Wood
Preservers' Association (AWPA) Standards C1, C2 (salt water use), and CI8 that specify proper
wood species, acceptable preservatives and minimum preservative retentions and penetrations.
Treatment choices are (1) creosote or creosote-coal tar solution or (2) arsenical salts (ACA,
ACZA, or CCA). In those areas where Teredo and pholad are present and Limnoria tripunctata
is absent, creosote will provide adequate protection. In those areas where Teredo and L.
tripunctata attack is expected and pholad attack is not, either dual treatment or an arsenical salt is
recommended. In those areas where Sphaeroma terebrcau is present or where L. tripunctata and
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