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' • Practical Approa~or Effective E ~. S Control - 86 <br />' This discussion merely points out the limirationr of some technologies based on <br />soil texture. Soil texture is routinely determined through the most fundamental <br />ojsoil 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 specifications of the <br />job. Simply put, it is the "Bubba" 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 matezials might be exceptional in their erosion control capabilities, <br /> they must be left undisturbed in order to function properly. A case in poin[ aze <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 compromised during installation when worker's boots 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 products aze inert and show <br /> little reaction or change as long as they aze kept in optimum conditions of <br /> temperature and moisture, some plant fiber-based, biodegradable materials <br /> require a constant rotation of stock in the wazehouse and have a limited time <br /> frame after which the plant fibers begin to decompose. <br />' <br /> Field Notes: Product specijcations 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 preserved in AS77Vf or AASHTO test minimum, <br /> typical or average values for characteristics such as tensile 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 /> <br /> © 1995 IECA <br />