2018-10-22_REVISION - M1977573 - Laserfiche WebLink

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r Transit Mix Concrete Co. 444 E. Costilla Street,Colorado Springs,CO 80903 Office: (719)475-0700 Fax: (719)475-0226 Soils Analysis Results and Seeding Evaluation Pueblo West 10-8-2018 The mine site discussed in this Revision is the Pueblo West Gravel Pit. The Pueblo West Gravel Pit is in final reclamation. Essentially, the reclamation seeding at the Pueblo West pit has failed. In order to enhance the establishment of the reclamation plant species, TMCC/CMC analyzed the Pueblo West site soils to determine the general soil characteristics. Knowing the soil characteristics will help determine which species should be seeded and should improve plant establishment. The full Soil Analysis Report is attached. The following table only includes those sample parameters which helped determine which plant species may be the best choice for the mine site. It also includes soil amendment recommendations, based on the site soil analyses. The species chosen are those with the ability to tolerate both saline and alkali soils, match the site soil texture and require the least amount of annual precipitation. We also recommend incorporating P205 into the soil and not applying NO3-N. The addition of nitrogen is generally not recommended when seeding rangeland plant species. However, the reclamation company which submitted a bid for the seeding recommends an organic fertilizer for nitrogen application. We are not adverse to the recommendation since the recommended organic fertilizer is slow release and will add much needed organic matter to the soil. The soil samples were collected at random locations around the perimeter of the Pueblo West Pit upland reservoir area. Soil samples 1 through 3 are composite samples. Soil sample 4 was a single sample based on a different soil appearance. However, since we will not create separate seed mixes for different areas and the soil textures are all similar, we prepared a general seed mix for the entire site. Sample pH EC NO3-N P* K Texture SAR Condition Location R958 8.1 3.7 89.5 29.5 570 SCL 1.0 Alkali/Salty R959 8.6 0.8 30.2 16.0 349 SCL 0.7 Alkali R960 8.0 3.0 39.1 11.8 389 SCL 0.8 Alkali/Salty R961 1 8.1 0.8 1 24.8 1 6.0 1 208 SCL 0.7 Alkali * P205 should be separately applied and well disked into the soil profile prior to seeding. ** pH greater than 7.9, alkaline soil EC greater than 2.5 —4, saline soil SAR greater than 10, sodic soil NO3-N deficient if less than 25 ppm P205 deficient if less than 26 ppm 2