[Code of Federal Regulations]
[Title 23, Volume 1]
[Revised as of April 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 23CFR635.417]

[Page 183]
 
                           TITLE 23--HIGHWAYS
 
 CHAPTER I--FEDERAL HIGHWAY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION
 
PART 635_CONSTRUCTION AND MAINTENANCE--Table of Contents
 
                 Subpart D_General Material Requirements
 
Sec. 635.417  Convict produced materials.

    (a) Materials produced after July 1, 1991, by convict labor may only 
be incorporated in a Federal-aid highway construction project if such 
materials have been:
    (1) Produced by convicts who are on parole, supervised release, or 
probation from a prison or
    (2) Produced in a qualified prison facility and the cumulative 
annual production amount of such materials for use in Federal-aid 
highway construction does not exceed the amount of such materials 
produced in such facility for use in Federal-aid highway construction 
during the 12-month period ending July 1, 1987.
    (b) Qualified prison facility means any prison facility in which 
convicts, during the 12-month period ending July 1, 1987, produced 
materials for use in Federal-aid highway construction projects.

[53 FR 1923, Jan. 25, 1988, as amended at 58 FR 38975, July 21, 1993]

Appendix A to Subpart D of Part 635--Summary of Acceptable Criteria for 
                    Specifying Types of Culvert Pipes

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                                                   Alternatives required                 AASHTO designations
   Type of drainage installation   ----------------------------------------------------  to be included with       Application             Remarks
                                         Yes             No              Number             alternatives
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Cross drains under high-type        .............  X............  ....................  ....................  Statewide...........  Any AASHTO-approved
 pavement.\1\                                                                                                                        material.\2\
Other cross-drain installations...  X............  .............  3 minimum...........  M-170 and M-190.....  ......do............   Do.\2\
Side-drain installations..........  X............  .............  ......do............  M-36................  ......do............   Do.\2\
Special installation conditions...  .............  X............  ....................  ....................  Individual            Specified to meet
                                                                                                               installation.         special condi-
                                                                                                                                     tions.
Special drainage systems (storm     .............  X............  ....................  ....................  ......do............  Specified to meet
 sewers, inverted siphons, etc.).                                                                                                    site require-ments.
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\1\ High-type pavement is generally described as FHWA construction type codes I, J, K, L, and plant mix and penetration macadam segments, respectively
  shown in the right-hand columns of type codes G and H having a combined thickness of surface and base of 7 in or more (or equivalent) or that are
  constructed on rigid bases.
\2\ Types not included in currently approved AASHTO specifications may be specified if recommended by the State with adequate justification and approved
  by FHWA.