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2010-07-23_REVISION - C1981008
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2010-07-23_REVISION - C1981008
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Last modified
8/24/2016 4:16:46 PM
Creation date
7/26/2010 9:59:42 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C1981008
IBM Index Class Name
REVISION
Doc Date
7/23/2010
Doc Name
Adequacy Review No. 4
From
DRMS
To
Western Fuels Colorado
Type & Sequence
PR6
Email Name
DAB
MLT
SB1
Media Type
D
Archive
No
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Spoil and Soil Suitablitily Sampling at New Horizon <br />Table 2.05.4(2)(d)-lA Spoil and Soil Suitability <br />\Af%D/_A W PROPERTY - PRIME FARMLAND <br /> THRESHOLD LEVELS <br /> Lift A Topsoil and Bench 1 <br />Parameter Unit Mixed Topsoil Lift B Topsoil Subsoil Substitute Surface Spoil <br /> Zones 1, 2, 3 &4 Zones 3 & 4 Zones 1 & 2 Zones 3 & 4 <br />pH standard units <6.1, >8.4 <6.1, >8.4 <6.1, >8.4 <6.1, >8.4 <br /> <br />at any ne <br />>4 >6 at any one >6 at any one >8 at an one <br />Electrical Conductivity (EC)1 mmho/cm location location or an location or an location <br /> average of >5 average of >5 <br />Saturation Percentage % <25, >80 <25, >80 <25, >80 N/A <br />Sodium Adsorption Ratio (SAR) Ratio >4 >4 >4 N/A <br />Exchangeable Sodium (ESP) % >15 N/A N/A N/A <br />Calcium Carbonate % >15 >40 >40 N/A <br /> <br />USDA Soil Texture (based on <br />All Except <br />S, LS, SC, SIC, C <br />S, LS, SC, SIC, C <br />S, LS, SC, SIC, C <br />N/A <br />particle size analysis)z <br />Boron ppm N/A N/A 5 5 <br /> <br />3 <br />" >35 in one location >35 in one location <br />N/A <br />Rock Fragments % + Diam <br />>15 and >10 3 and >25 average and >25 average <br />Sample Grid 1 per 2.5 acres 1 per 2.5 acres 1 per 2.5 acres 1 per 5 acres <br /> Total lift thickness; Total lift thickness; 33 inch thickness; 1 <br />Sample Thickness max 2-ft increment max 2-ft increment sample increment 1, 2-ft increment <br /> per sample per sample <br />Zones 1 & 2 - areas where Lift A or Mixed Topsoil is placed directly on the Bench 1 Subsoil Substitute (no Lift B Topsoil is present) <br />Zones 3 & 4 - areas where both Lift B and Lift A or Mixed Topsoil are replaced over Bench 1 Surface Spoil <br />1 The actual maximum acceptable salt level, measured by Electrical Conductivity, will depend on the plant species proposed in the <br />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 <br />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 <br />(Attachment 2.05.4(2)(d)-2), titled Salt Tolerance of Various Temperate Zone Ornamental Plants, shows that alfalfa handles a soil conductivitiy <br />of 4-8mmho/cm. The specific species cited is Medicago Sativa, which is the same as that prescribed in the revegetation plan for Irrigated <br />Cropland. Also this reference does not differentitate between topsoil and subsoil. Based on this data, and NRCS recommendations, the limits <br />for Electrical Conductivity are shown in Table 2.05.4(2)(d)-1A and 1B for the various topsoil and subsoil types. The averages will be reported <br />for each landowner in the Soil Sampling Report. <br />2 USDA Soil Textures - unsuitable textures are: S-sand; LS-loamy sand; SC-Sandy clay: SIC-silty clay; C-clay <br />3 Prime Farmland Lift A Topsoil will not have >10% cobbles, stones and boulders (3-inch-plus mean diameter) and 15% total rock fragment <br />content by volume. The 3-inch-plus % is estimated visually (by volume) using standard charts. The 3-inch-minus rock fragment volume is <br />estimated using sieve and collection pans.
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