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Practical Approaches rar EJieztive E R S Caottol - 82 Cp 1.'repantioo Casts Some technologies, such as erosion control blankets, regain: a certain amount of surface work (i.e. seedbed preparation); other technologies, such as hydraulic applications typically do not. These preparation cosu should be considered and added to the overall cosu for a particular practice. Fore example: A specification has been written for hydraulic seeding of a 3:1 slope which requires no surface preparation: The Cp factor would be ~). A specification might also be written for erosion control bLutkeu on the same slope which might call for blankets to be installed as to "rttrtnufacturer's recommendations" ,which would necessarily include some seedbed preparation such as raking, rock removal and perhaps application of wed and fertilizer prior to blanket instaLtation. While the material costs of the seed and fertilizer might be the same for both applications, the method of application varies. In hydraulic. applications, the seed and fertilizer application occurs in one step and is pan: of the technology: In blanket applications, seed and fertilizer is applied in a srparate operation, and adds, along with surface preparation, to the cost of application. The Cp for blankets is then greater than $0. Field Notes: Some technologies, such as turf reinforcement materials (1'RM) or biotechnical composites 1BC) require euensive preparation procedures. However, rhese cows can generally be included under CI, Installation Costs. SUMMARY Using the example of the straw blankets applied over 1 acre on a 3:1 slope requiring surface preparation, we could derive the following costs: CM = 52,904.12 per acre CA = + S 484.00 (for staples) Cl = + $ 403.33 per acre Cp = + $ 200.00 per acre (approx) TOTAL COSTS (C) _ $3,991.45 per acre or = $ 0.83 per sq yd or = $ 0.09 per sq ft O 1995 IECA