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Practical Approaches for Effective E & S Control • 86 <br />This discussion merely points our the limitations of some technologies based on <br />soil texture. Soil texture is rourinely determined through the most fiuulametuai <br />of soil tests. <br />INSTALLATION <br />D Durability <br />Our discussion of durability relates to an erosion control material's ability to <br />withstand rough handling, not necessarily the engineering :~ecifications of the <br />job. Simply put, it is the 'Sabha' factor, and is a qualitative evaluation of how <br />a material holds together during shipment, storage, rehandling and application <br />on the job site. <br />While some materials might be exceptional in their erosion control capabilities, <br />they must be left undisturbed in order to function properly. A case in point are <br />soil sealants which form a protective crust on the soil surface: If this crust is <br />disturbed by vehicular or pedestrian traffic, the erosion control effectiveness of <br />the system is damaged. Similarly, there are erosion control blankets whose <br />structural integrity is wmpromised during installation when worker's boon get • <br />tangled in the loose netting and fastening devices such as geotextile sewing <br />machines, staple guns and ring fasteners which breakdown under rough <br />handling. <br />Weight and packaging should be considered as part of the Bubba factor, but <br />only as they relate to the ease of handling and how this relates to durability. <br />Longevity, or shelf life of a product, is also a condition which affects <br />durability. While most chemical and synthetic type produce are inert and show <br />little reaction or change as long as they are kept in optimum conditions of <br />temperature and moisture, some plant fiber-based, biodegradable materials <br />require a constant rotation of stock in the warehouse and have a limited time <br />frame after which the plant fibers begin to decompose. <br />Field Notes: Product specifications for similar type of products can yield some <br />insight into the durability of the material. Similarly, engineering spec's are <br />usually very defined, and are presented in ASTM or AASEITO test minimum, <br />rypicd or average vafues for characteristics such as tensi,ie strength, puncture <br />resistance, porosity. The discussion presented herein does not seek to substitute <br />for specific job or material requirements which are for the most part, site and <br />design determined. <br />O 1995 IECA <br />