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Cp Preparation Costs Pracuml Approac6~r Elrxtive E & 5 Control - 82 Some technologies, such as erosion control blankets, require a certain amount of surface work (i.e. seedbed preparation); other technologies, such as hydraulic applications typically do not. These preparation costs should be considered and added to the overall costs for a particular practice. Fore example: A specification has been written for hydraulic seeding of a 3: I slope which requirrs no surface preparation: The Cp factor would be S0. A specification might also be written for erosion control blankets on the same slope which might call for blankets to be installed as to "manufacturer's recommendations" ,which would necessarily include some seedbed preparation such as raking, rock removal and perhaps application of seed and fertilizer prior to blanket installation. 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 part of the technology: In nlanket applications, seed and fertilizer is applied in a separate 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, sucA as turf reinforcement materials (IRM) or biotechnical composites (BCJ require extensive preparation procedures. However, these costs can generally be included under Cl, Installation Costs. S[JNIl~IARY 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 = + 5 484.00 (for staples) Cl = + S 403.33 per acre Cp = + S 200.00 per acre (approx) TOTAL COSTS (C) _ $3,991.45 per acre or = S 0.83 per sq yd or = S 0.09 per sq tt O 1995 fECA