Page 343 - Facility Piping Systems Handbook for Industrial, Commercial, and Healthcare Facilities
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SITE UTILITY SYSTEMS
Curvature C c 1 to 3 <1 or >3 1 to 3 <1 or >3 Same as for GW, GP, SW, (Continued)
Coefficients Uniformity C u >4 <4 >6 <6 and SP
Atterberg limits PI LL Nonplastic Nonplastic Nonplastic Nonplastic
No. 200 (0.075) <5 <5 <5 5 to 12
Percentage passing sieve sizes No. 4 1 1/2 in (4.75 mm) (40 mm) <10 100 <50 100 <50 of 100 “coarse fraction” >50 of “coarse fraction” Varies 100
Classification of Soils for Embedment and Backfill Soil group symbol Description D2487 Angular, crushed stone or None rock, crushed gravel, broken coral, crushed slag, cinders or shells; large void content, contain little or no fines. Angular, crushed stone (or None other Class 1A materials) and stone/sand mixtures with gradations selected to minimize migration of adjacent soils; conta
TABLE 6.20 Type Class Manufactured IA aggregates: open- graded, clean Manufactured, IB processed aggregates; dense- graded, clean Coarsegrained soils, II clean Coarsegrained soils, borderline clean to w/fines
6.65
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