SECTION 850 — ROCK LINING


850.1 DESCRIPTION — This work is construction of rock lining of the class indicated.

850.2 MATERIAL —

(a) Rock.

1. General. Acceptable quality; sound; free from structural defects and foreign substances, such as soil, shale, and organic materials. Unless the rock comes from material providing an approved Type A Aggregate, submit samples to the MTD for petrographic examination for durability prior to use.
Use rock meeting the following requirements:

2. Size and Gradation.
Percent Passing (Square Openings)
Class, Size No.
(NCSA)
R-8**
R-7**
R-6
R-5
R-4
R-3
Rock Size
(Inches)
42
100*
30
100*
24
15-50
100*
18
15-50
100*
15
0-15
12
0-15
15-50
100*
9
15-50
6
0-15
15-50
100*
4
0-15
3
0-15
15-50
2
0-15
Nominal Placement
Thickness (inches)
48
36
30
24
18
12
No Supplement

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