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2571 <br /> Minnesota 2020 Standard Specifications 737 <br />(1) Mow existing vegetation to at least 3 inches at least 7 Calendar Days before <br />spraying herbicide. Remove the cuttings. Allow the vegetation to regrow to a <br />height from 4 inches to 8 inches before applying the herbicide. <br />(2) At least 3 Calendar Days before applying herbicide, submit to the Engineer, <br />labels of the intended herbicides and a copy of a valid MN Pesticide Applicator <br />License, including Category A and Category J. <br />(3) Spray and kill turf and weeds, including the top growth and roots, only within <br />designated areas using a non-selective, non-residual post emergent herbicide <br />containing 41 percent glyphosate as the active ingredient. Ensure personnel, <br />licensed by the MDA and experienced in the use of chemical pesticides perform <br />the Work in accordance with the manufacturer’s instructions and <br />recommendations. Apply the herbicide to dry foliage on actively growing <br />vegetation. Apply the herbicide in August or early September before the fall or <br />spring Plant Installation Period (PIP) as required by the Contract. If an August or <br />September application is not possible for the spring PIP, apply the herbicide in <br />late April or early May. If precipitation occurs within 6 hours after applying <br />herbicide, reapply herbicide as needed to achieve 100 percent kill. <br />(4) Before beginning soil cultivation Work, schedule and perform a competency <br />test to the satisfaction of the Engineer. The Engineer considers a satisfactory <br />competency test one that demonstrates acceptable soil cultivation, <br />incorporation of soil additives, compaction levels, and soil drainage in <br />1 planting bed area and 1 individual tree planting area. <br />(5) Before placing soil additives as shown on the Plans, use a spading machine to <br />deep cultivate the planting hole and bed areas by loosening the soil to at leas t <br />12 inches deep and a compaction level of no more than 200 psi to this depth, <br />as measured from the finished grade elevation of the soil. The Engineer may <br />approve other Equipment to address site constraints, if requested by the <br />Contractor. For hydraulic spade-type, machine-moved tree-transplanting, the <br />Engineer will not require planting hole cultivation, other than loosening the soil <br />outside the soil-ball perimeter in accordance with the Standard Plans shown on <br />the Plans. <br />(6) Unless otherwise shown on the Plans, add 4 inches of Grade 2 compost, in <br />accordance with 3890, “Compost” and other soil additives shown on the Plans <br />or as requested by the Contractor and approved by the Engineer, over the <br />cultivated planting hole and bed areas and use a spading machine to <br />incorporate it to a depth of at least 12 inches, as measured from the finished <br />grade elevation of the soil. <br />(7) Use a compaction tester to ensure compaction in the planting hole and bed <br />areas does not exceed 200 psi to a depth of at least 16 inches. If Contractor- <br />operations result in zones of hardpan or excessively compacted soil, repeat <br />deep cultivation or de-compact the subsoil in accordance with 2106.3I, <br />“Finishing Operations,” specifically the requirements for turf establishment <br />areas, at no additional cost to the Department. <br />(8) Ensure drainage in the planting hole and bed areas. For suspected drainage <br />problems, perform a percolation test by filling a 16 inches deep planting hole <br />with water and measuring the time it takes the water to drain from the hole. <br />The Engineer considers adequate drainage equal to or greater than a <br />percolation rate of 1/2 inch per hour. If drainage does not meet these <br />requirements, request approval from the Engineer to relocate or delete <br />affected planting locations or proceed with Extra Work using one or a <br />combination of the Standard Plans for poorly drained soils, as shown on the <br />Plans.