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City of St. Louis Park TURF ESTABLISHMENT <br />2020 Page 3 of 7 <br />  <br />25-142 April 1- Sept. 1 N/A <br />Any seed mix that beginning with at "3" April 15 - July 20 Sept. 20 - Oct. 20 <br />Adjustments to growing dates may be modified by no more than 10 calendar days by the <br />Engineer based on weather conditions. Provide temporary stabilization when outside the <br />season of planting dates of the specified permanent seed mixture. <br />A full warranty period is required to ensure proper vegetation establishment and longevity. <br />A 45 day maintenance period is required for all seeded areas. For seed that is planted after <br />November 1, the 45 day maintenance period will not begin until the following April 15 and will <br />continue for the full 45 days. <br />If the Contractor chooses to temporarily stabilize the areas to be seeded after November 1 instead <br />of completing the final stabilization process, the Contractor may submit a temporary stabilization <br />plan to the Engineer defining the temporary stabilization plan, to include erosion and sediment <br />controls, schedule, and a maintenance plan. The costs to implement a temporary stabilization plan <br />after November 1 will be considered incidental to this Contract. <br />A 30 day maintenance period is required for sod which shall not include days between November <br />1 and April 15. <br />903.2 GROUND PREPARATION <br />Topsoil shall be placed no more than five (5) working days before placement of sod or seed. <br />All areas disturbed by construction outside of paved areas shall be excavated to a depth of six (6) <br />inches, and tilled to a depth of six (6) to twelve (12) inches to remove compaction, unless <br />otherwise indicated. <br />Distribute only stockpiled and/or designated select topsoil borrow over the areas to be sodded or <br />seeded to provide the specified depth of cover for the areas shown on the plans to be sodded and <br />bring the entire site to grade. The depth of topsoil cover shall be six (6) inches, unless otherwise <br />indicated. <br />Areas shall be worked until soil is completely fined and in a mellow condition to finish grade. <br />Holes, depressions, and rivulets shall be filled in and brought to a smooth grade. <br />All sticks, branches, stones, or other debris on the surface over two (2) inch in size shall be <br />picked up and removed. <br />No heavy equipment except lawn rollers shall be moved over turf areas after soil has been <br />prepared, unless soil is again graded and loosened as specified above. <br />Grades not otherwise indicated shall be uniform between points where elevations are given or <br />between such points and finish grades. The maximum slope shall be no steeper than one (1) <br />vertical to three (3) horizontal. Abrupt changes in slopes shall be rounded. All holes, depressions, <br />and rivulets shall be filled and brought to a smooth grade. All areas shall be graded to drain to the <br />street or to a drainage structure. <br />If the placed topsoil is compacted, the topsoil shall be loosened to a minimum depth of six (6) <br />inches using disks, harrows, field diggers, or other suitable cultivating equipment. <br /> <br />