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~~ <br />685 When the Contractor substitutes Structure Backfill (Flow-Fill) for Structure Backfill (Class l) or <br />686 (Class 2), there will be no adjustment in the price or the quantity paid for structure excavation or <br />687 structure Backfill as a result of reducing the trench width. <br />688 <br />689 3.1.4 Section 209 -Watering and Dust Palliatives <br />690 209.01 Description. This work consists of applying water to soils or aggregates for moisture <br />691 and density control, landscaping, prewetting an excavation area, and dust palliatives. It shall also <br />692 include applying magnesium chloride dust palliative for the control of dust and the stabilization <br />693 of soil and aggregate surfaced roads. <br />694 <br />695 <br />696 <br />697 <br />698 <br />699 <br />700 <br />701 <br />702 <br />703 <br />704 <br />705 <br />706 <br />707 <br />708 <br />709 <br />710 <br />721 <br />712 <br />713 <br />714 <br />715 <br />716 <br />717 <br />718 <br />719 <br />720 <br />721 <br />722 <br />209.02 Materials. Water applied for moisture and density control, as dust palliative, and for <br />prewetting shall be free from injurious matter. Water for landscaping shall be free from oil, <br />acids, alkalis, salts, or any substance injurious to plant life. When the water source proposed for <br />use by the Contractor is not of known quality and chemical content, samples of the water shall be <br />submitted for approval prior to use. Magnesium chloride dust palliative shall consist of a <br />magnesium chloride base agent, water, and other enhancing or non-detrimental ions. The <br />chemical analysis shall conform to the following: <br />Chemical Constituents Percent by Weight <br />Ma nesium Chloride (M Cl2) 28 to 3S <br />Enhancin orNon-detrimental Ions 0 to 5 <br />Water 65 to 72 <br />Construction Requirements <br />209.03 Moisture and Density Control. Sprinkling equipment shall. deliver uniform and <br />controlled distribution of water without ponding or washing. Water for finishing operations shall <br />be uniformly applied by spraying across the full width of the course. <br />209.04 Prewetting. Prewetting material in excavation azeas prior to its removal for placement <br />in embankments will be allowed when approved. The Contractor shall furnish a prewetting <br />layout for each area to be prewetted including nozzle size, spacing, number of lines, and other <br />equipment to be used. The Contractor shall obtain the approval of the Engineer for each <br />prewetting layout prior to each prewetting operation. <br />209.05 Dust P811iative. The Contractor shall furnish and apply a dust palliative on portions of <br />the roadway and on haul roads at the locations and in the amounts as provided in the Contract. <br />Dust palliative shall consist of water. Application of water shall be done with acceptable <br />sprinkling equipment at an appropriate rate as approved by the Engineer. <br />Magnesium Chloride dust palliative shall be applied as follows: Scarify 'the top 2 inches of the <br />existing road surface and wet with water to approximately four percent moisture content, or as <br />3-18 <br />G-\101W0100.p2N\RepoNS\KMTeWnical Speci(ptions.Eac February 3, 2006 <br />C~ <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />