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3.4 Seedbed Material Sampling The laboratory selected to analyze the samples should be contacted at least 15 days In advance of the sampling period to aid In coordinating sample analysis with the beglnhing of revegetation activities on site. All samples should be taken with either a file spade or Boll auger. This equipment will be free of all foreign substances end rust. No galvanized tools will be used. Approximately 1 quart of material need be collected for each sample. All samples will be placed in clean polyethylene bags at the time of collection and securely sealed for delivery to the laboratory. All efforts will be made to deliver the samples to the laboratory as soon es possible. When samples cannot be delivered within 24 hours of collection, samples will be air-dried. Approximately 48 hours can be considered a suffldent time for air-dying. Samples should. be dried In as dust-free of ah environment as Is possible. Two composes samples will be collected representing the surface 0-6 and 624 Inch depths of seedbed material. Composite samples will be composed of 3 subsamples. For each sample set, the average slope and estimated percent coarse fragment content by volume need be noted. All sample site locations will be noted on a field map. (Additional composite samples would be required for larger areas.) Each sample should be analyzed at a minimum for: • pH, • texture (field method), • percent organic matter, • NH4-N and N03-N (ppm), • phosphorus (ppm), • potassium (ppm), • electrical conductivity (mmhos/cm), • Ilme estimate, and • sodium adsorption ratio, H advisable, Accompanying each composite sample should be a brier discussion of the area from which the sample was collected. The discussion should Include comments concerning: • plant species to be established, • type of seedbed preparation techniques to be employed, • type of mulching practices to be employed, K applicable, • approximate slope, • any special problems or conditions, and 6