1.1 This specification covers the manufacture and purchaserequirements of products used for the assembly and construction ofprecast reinforced concrete manholes used in sewer and waterworks.

1.2 Part I, Sections 1-11, of this specification presentsgeneral requirements and requirements that are common to eachprecast concrete product covered by this specification.

1.3 Part II of this specification presents specific requirementsfor each manhole product in the following sections:

Note 1—Future products will to be included in Part II in afuture revision of this specification.

1.4 A complete metric companion to this specification has beendeveloped, Specification C 478M; therefore, no metric equivalentsare presented in this specification.

Note 2—This specification is a manufacturing and purchasespecification only and does not include requirements for backfill,or the relationship between field load conditions and the strengthrequirements of the manhole products and appurtenances. Experiencehas shown, however, that the successful performance of this productdepends upon the proper selection of the product strength, type offoundation and backfill, and care in the field installation of themanhole products and connecting pipes. The owner of the project forwhich these products are specified herein is cautioned to requireinspection at the construction site.