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Table 2.05.4(2)(d)-16 Spoil and Soil Suitability LLOYD AND WFC PROPERTIES WEST OF 2700 ROAD Irrigable Lloyd and WFC (Non-Prime) WFC Prime Farmland Lloyd and WFC (non-irrigable) Zone 7 Zone 8 Zone 9 Parameters Units Mixed Topsoil Bench 1 Surface Spoil Mixed Topsoil (Upper Mixed Topsoil (Below Bench 1 Surface Spoil Mixed Topsoil Bench 1 Surface Spoil 2 feet) 2 feet) PH standard units <6.1, >8.4 <6.1, >8.4 <6.1, >8.4 <6.1, >8.4 <6.1, >8.4 <6.1, >8.4 <6.1, >8.4 > 6 in one location or > 4 at any one > 6 at any one > 6 in one location or Electrical Conductivity (EC)1 mmho/cm > 5 average / >8 location location >8 > 5 average / >8 landowner landowner Saturation Percentage % <25, >80 N/A <25, >80 <25, >80 NA <25, >80 N/A Sodium Adsorption Ratio (SAR) Ratio >4 N/A >4 >4 NA >4 N/A Exchangeable Sodium (ESP) % N/A N/A >15 N/A NA N/A N/A Calcium Carbonate % N/A N/A >15 >40 NA N/A N/A Particle Size - USDA2 All Except S, LS, SC, SIC, C N/A S, LS, SC, SIC, C S, LS, SC, SIC, C NA S, LS, SC, SIC, C N/A Boron ppm N/A >5 N/A N/A 5 N/A >5 >35 in one location >35 in one location. Rock Fragments3 % and >25 avg. for any Upper 2-foot >15 and >10 3"+ Diam >35 N/A N/A N/A one landowner increment only Sample Grid 1 per 5 acres 1 per 5 acres 1 per 2.5 acres 1 per 2.5 acres 1 per 5 acres 1 per 5 acres 1 per 5 acres Total lift thickness; Total lift thickness; Total lift thickness; 1 Sample Thickness max 2-ft increment 2, 2-ft increments Top 2 feet max 2-ft increment 1, 2-ft increment increment 2, 2-ft increments per sample per sample 1 The actual maximum acceptable salt level, measured by Electrical Conductivity, will depend on the plant species proposed in the revegetation plan and the potential for upward salt movement. As pointed out in the report in Attachment 2.05.4(2)(d)-1, NRCS stated a level of 6.0 in the subsoil would not be detrimental to grasses or alfalfa. A study done by Curtis Swift, PhD. of Colorado State University (Attachment 2.05.4(2)(d)- 2), titled Salt Tolerance of Various Temperate Zone Ornamental Plants, shows that alfalfa handles a soil conductivitiy of 4-8mmho/cm. The specific species cited is Medicago Sativa, which is the same as that prescribed in the revegetation plan for Irrigated Cropland. Also this reference does not differentitate between topsoil and subsoil. Based on this data, and NRCS recommendations, the limits for Electrical Conductivity are shown in Table 2.05.4(2)(d)-1A and 113 for the various topsoil and subsoil types. The averages will be reported for each landowner in the Soil Sampling Report. 2 USDA Soil Textures - unsuitable textures are: S-sand; LS-loamy sand; SC-Sandy clay: SIC-silty clay; C-clay 3 Prime Farmland Lift A Topsoil will not have >10% cobbles, stones and boulders (3-inch-plus mean diameter) and 15% total rock fragment content by volume. The 3-inch-plus % is estimated visually (by volume) using standard charts. The 3-inch-minus rock fragment volume is estimated using sieve and collection pans.