SECTION 615 - LOAM 6-50
615.01 Description This work shall consist of furnishing and placing loam or dirty
borrow for seeding or sodding, in reasonably close conformity with the thicknesses called for on the plans or as authorized.
615.02 Materials Materials shall conform to the requirements specified in the following
Sections of Division 700 - Materials: Common Borrow 703.18 H u m u s 717.09 Loam shall meet the following requirements: O r g a n i c C o n t e n t P e r c e n t by Volume H u m u s 5 % - 10%, as determined by Ignition Test p H 5.5 – 7.5 Mineral Content Percent passing sieve 8 5 - 100% #10 3 5 - 8 5 % #40 1 0 - 3 5 % #200 The loam shall be screened, loose, friable, and shall be free from admixture of subsoil, refuse, large stones, clods, roots, or other undesirable foreign matter. It shall be reasonably free of weeds, roots, or rhizomes. Dirty Borrow shall meet the requirements of Section 703.18 Common Borrow with the following addition and deletions:
703.18 Second sentence delete the word peat
Dirty Borrow shall contain no particles or fragments with a maximum dimension in excess of the compacted thickness of the layer being placed. Mineral Content Percent passing sieve 75-100% #10 5- 40% #200 Dirty Borrow must have an organic content of 3% to 8% as determined by ignition test. 6-51 The Contractor may elect to manufacture loam or dirty borrow from a combination of project materials that the Contractor is entitled to use, combined with other suitable materials furnished by the Contractor. The Resident shall obtain a sample from loam stockpiles identified by the Contractor Samples will be submitted to Department testing facility. Only loam from passing stockpiles shall be used. The Contractor may elect to manufacture loam from a combination of project materials that the Contractor is entitled to use, combined with other suitable materials furnished by the Contractor.
615.03 Preparing Areas All slopes and other areas where loam or dirty borrow is to
be placed shall be shaped to the required grade. Before placing the loam on hard or compacted soils, the areas under preparation shall be scarified and loosened to a depth of at least 2 inches.
615.04 Placement of Loam Loam shall be spread uniformly on pr epared areas to the
depth shown on the plans or as directed. Any remaining clods, roots, stones over 2 inches in its greatest diameter and all other foreign matter, shall be removed. On areas to be seeded under Method Number 1, all rocks over 1 inch in diameter shall be removed. All loam shall be brought to a true, even surface, meeting the required grade. The Contractor shall compact the loam with a 100 pound roller or other approved means. Loam thickness shall meet the specified depth after compaction. Dirty Borrow shall be spread evenly and uniformly on prepared areas to the depth shown on the plans or as directed, and shall be brought to a true, even surface, meeting the required grade.
615.05 Method of Measurement Loam or dirty borrow will be measured by the cubic
yard complete in place after finishing to the required depths as shown on the plans or directed. Lateral measurements will be parallel with the slope of the ground. Removal of existing topsoil salvaged from within the lines of improvement will be measured for payment in accordance with Section 203.18. The depth of the salvaged topsoil to be included for payment shall be the depth authorized. There will be no deduction from borrow quantities resulting from the authorized excavation of salvaged topsoil.
615.06 Basis of Payment The accepted quantities of loam or di rty borrow will be
paid for at the contract unit price per cubic yard complete in place. Existing topsoil removed from within the lines of improvement and stockpiled for later use as dirty borrow will be paid for under Pay Item 203.20, Common Excavation, after removal and stockpiling, and will be paid for under Pay Item 615.10, Dirty Borrow, when placed in its final position. Grading surplus topsoil, salvaged but not required for use on slopes as loam or dirty borrow, will be paid for under the appropriate items of Section 631 - Equipment Rental, Section 618 - Seeding, and Section 619 - Mulch. 6-52 Payment will be made under: Pay Item P a y U n i t
615.07 Loam Cubic Yard
615.0701 Loam - Plan Quantity Cubic Yard
615.10 Dirty Borrow Cubic Yard
Loam in other states
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