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2571 <br /> Minnesota 2020 Standard Specifications 739 <br />Project. The Engineer considers a satisfactory competency test to be one that demonstrates <br />acceptable handling of plants, digging of holes and beds, installation of plants, initial watering, <br />installation of protection Materials and mulching. <br />Before digging planting holes, rake temporary erosion control wood chip mulch off <br />prepared planting areas to prevent wood chip contamination of the planting soil in the holes. <br />The Contractor may respread wood chip mulch formerly used as temporary erosion <br />control around plants to a depth no greater than 1 inch following plant installation, if newly <br />provided and acceptable Type 6 mulch is applied over the top to the depth shown on the <br />Standard Plans in the Plans. <br />Dig planting holes to the configuration and minimum dimensions shown in the Standard <br />Plans on the Plans. If the soil moisture is greater than field capacity, do not Work in planting <br />holes and beds. <br />Ensure drainage in the planting hole and bed areas . For a suspected drainage problem, <br />perform a percolation test by filling a 16 inches deep planting hole with water and measuring the <br />time it takes the water to drain from the hole. The Engineer considers adequate drainage equal <br />to or greater than a 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 affected planting <br />locations or proceed with Extra Work using one or a combination of the Standard Plans for poorly <br />drained soils as shown on the Plans. <br />G Watering <br />Provide watering Equipment and forces on the Project capable of completely watering plants as <br />often as necessary to maintain soil moisture in the root zones. <br />Within 2 hours of installation, saturate the backfill soil of each plant with water. After settling, <br />provide additional backfill to fill in the voids. <br />H Mulch <br />Before placing mulch, fine grade and level the planting bed soils with hand tools. Place mulch <br />Material in accordance with the Plans and Standard Plans no more than 7 Calendar Days after plant <br />installation. Mulch contaminated with soil during installation or otherwise not complying with the <br />requirements of 3882, “Mulch Material,” is unacceptable. Remove unacceptable mulch from the Project. <br />I Protection of Installed Trees <br />Use protective Materials to ensure the healthy growth and survival of installed trees. Tree <br />protection measures to address fall/winter environmental conditions must be removed the following <br />spring. <br />I.1 Staking and Guying <br />Unless staking and guying is shown on the Plans, only stake and guy trees if necessary to <br />maintain the trees in a plumb condition. The following circumstances may warrant staking and <br />guying: <br />(1) Excessive soil moisture <br />(2) Light-textured soil <br />(3) Steep slopes <br />(4) Exposure to excessive wind <br />(5) The likelihood of vandalism <br />Install staking and guying in accordance with the Standard Plans shown on the Plans.