Page 345 - Facility Piping Systems Handbook for Industrial, Commercial, and Healthcare Facilities

SITE UTILITY SYSTEMS

Class IV-A Obtain geotechnical evaluation of proposed material. May not be suitable under high earth fills, surface-applied wheel loads, and under heavy vibratory compactors and tampers. Do not use where water conditions in trench may cause instability. Suitable only in undisturbed condition and where trench is dry. Remove all loose material and provide firm, uniform

Do not use where water conditions in trench may cause instability. Suitable as foundation and for replacing overexcavated trench bottom as restricted above. Do not use in thicknesses greater than 12 in total. Install and compact in 6-in maximum layers. Suitable only in dry trench conditions. Install and compact in 6-in maximum layers. Level final grade by hand. Mi

Recommendations for Installation and Use of Soils and Aggregates for Foundation, Backfill, and Embedment
Class III

Soil class (see Table 6.20) * Class II Where hydraulic gradient exists check gradation to minimize migration. “Clean” groups suitable for use as drainage blanket and underdrain. Suitable as a foundation and for replacing overexcavated and unstable trench bottom as restricted above. Install and compact in 6-in maximum layers. Suitable as restricted above. Instal

Class IB Process materials as required to obtain gradation which will minimize migration of adjacent materials. Suitable for use as drainage blanket and underdrain. Suitable as foundation and for replacing overexcavated and unstable trench bottom. Install and compact in 6-in maximum layers. Install and compact in 6-in maximum layers. Level final gra

Do not use where conditions may cause migration of fines from adjacent soil and loss of pipe support. Suitable for use as a drainage blanket and underdrain in rock cuts where adjacent material is suitably graded. Suitable as foundation and for replacing over- excavated and unstable trench bottom as restricted above. Install and compact in 6-in maximum layers. Suitable

Class IA

TABLE 6.21 Use General recommendations and restrictions Foundation Bedding

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