120 Page 128120 ROADWAY AND DRAINAGE EXCAVATION AND EMBANKMENT CONSTRUCTION
120.1DESCRIPTION
This work consists of excavation, placement, and disposal of material necessary for the construction of the roadway including hauling, watering, and when required, the placement of select subgrade topping.
120.2MATERIALS
A.Unclassified Excavation: All materials except those classified as unclassified/rock excavation; rock excavation; muck excavation; unclassified excavation, digouts; option borrow excavation; contractor furnished borrow excavation; borrow unclassified excavation, and other removal items paid for under Section 110 encountered during the construction of the work, regardless of the nature of the material or manner in which the material is removed, will be considered unclassified excavation. B.Unclassified/Rock Excavation: Unclassified/rock excavation consists of the excavation and placement of both soil and rock when both are anticipated throughout the project area. This item differs from unclassified excavation in that an undetermined quantity of rock will be excavated in addition to the materials included in unclassified excavation. C.Rock Excavation: Rock excavation will consist of a sound, solid mass of mineral matter in place and of such hardness and texture that the mass cannot be loosened or broken down by ripping in a single pass with a tractor mounted hydraulic ripper equipped with one digging point. The ripper and tooth will be of a standard design, adequately sized and used with a large crawler type tractor rated between 370 and 460 net fly wheel horsepower, operating in low gear, with sufficient downward force on the ripper. D.Muck Excavation: Muck excavation consists of the removal and disposal of saturated organic mixtures of soils and organic matter which requires additional work or equipment not normally required for unclassified excavation. E.Unclassified Excavation, Digouts: Unclassified excavation, digouts consists of the removal and disposal of unstable material below an existing surface on which surfacing material is to be placed. F.Option Borrow Excavation: Material, furnished by the Department, from a pit or other source. The Contractor may use this material at the Contractor’s option. G.Contractor Furnished Borrow Excavation: Material, furnished by the Contractor, from a pit or other source. H.Borrow Unclassified Excavation: Material, furnished by the Department, from a pit or other source. The Contractor must use this material. I.Select Subgrade Topping: Sources of selected subgrade topping material will be confined to the areas specified. The upper 6 inches of sodded areas, materials with high humus or silt content, and outwashed material in poorly drained areas will not be acceptable. 120 Page 129Unsatisfactory material found within the specified sources will not be used as select subgrade topping. J.Undercutting: Undercutting will consist of excavating, replacing, and compacting the material immediately below the finished subgrade surface, at locations specified and to the depth specified. K.Water: Water will be furnished by the Contractor and will be free from injurious matter. L.Pit Run: Pit run will conform to Section 882.
120.3CONSTRUCTION REQUIREMENTS
The excavation and embankments for the roadway, intersections, and entrances will be finished to smooth and uniform surfaces. Materials will not be wasted without written permission. Grading operations will be conducted so that material outside of the limits of slopes will not be disturbed. Prior to beginning grading operations in any area, clearing and grubbing will have been performed in accordance with Section 100. Borrow material will not be used until all roadway excavation has been placed in the embankment unless otherwise directed by the Engineer. If using borrow material causes a waste of mainline excavation, the volume wasted will be deducted from the volume measured in the borrow area. Unsuitable material encountered in the subgrade or slopes will be removed and the area backfilled to the finished graded section with approved material. Operations will be conducted so the Engineer can take necessary cross-sectional measurements before excavation and before the backfill is placed. Unsuitable material will be disposed of at locations acceptable to the Engineer. A disk designed and constructed for construction purposes will be in use while embankment is being placed, processed, or dried. The disk will be a tandem disk approximately 12 feet wide with 8 disk blades, approximately 36 inches in diameter, per row, and will weigh approximately 11,800 pounds. This requirement will be waived for A-3 and A-2-4(0) soils. The subgrade will be finished to within minus 0.04 feet to plus 0.08 feet from the design grade and typical section shown in the plans and to within ± 0.5% of the typical section cross slope. The quarter crown within any 12-foot transverse length will not exceed 0.04 feet when measured with a straight edge, string line, or by other suitable equipment. The centerline will be finished to a transverse distance within ± 0.25 feet of the plan’s shown location of centerline. The following are definitions for the succeeding three paragraphs only: Earth moving operations - The removal of surfacing or topsoil. Sediment control - Sediment control will include, but is not limited to, placing silt fence, inlet protection, and perimeter controls. 120 Page 130Erosion control - Erosion control will include, but is not limited to, placing seed, erosion control blanket, erosion control wattles, turf reinforcement mat, and erosion bales and spreading topsoil. The Contractor will not begin earth moving operations until all sediment control measures are placed beyond the work limits but within the right-of-way and easements. The Contractor will not begin earth moving operations in the 3rd mile until placement of granular base material has begun in the 1st mile, or as specified in the plans. The Contractor will not begin earth moving operations in a 3rd mile until erosion control measures within the work limits have begun in the 1st mile. When plans call for prime, the prime application will closely follow the base finishing operation and at no time will the prime operation be more than 3 miles from the base finishing operation. The cure time for the processed base, prime, and blotting sand application will be determined by the Engineer. A.Excavation: The unclassified excavation quantities will not be increased or decreased to reflect whether salvaged material was taken from cut or fill sections. 1.Classification of Excavation: Authority to identify and define the physical characteristics which determine classification will be the Engineer's. 2.Salvage of Topsoil: Topsoil will be removed from designated areas as described in Section 230. Topsoil that is not designated to be used will be placed in the embankment as described in 3.Undercutting and Material Selection: When specified, select materials will be utilized to improve the roadbed. The work will be performed in such manner that suitable materials may be selected, removed separately, and deposited in the roadbed within the limits and elevation required. On specified density projects, the Contractor will undercut to the limits specified. On ordinary compaction projects, where no undercut is specified, the Contractor will scarify the exposed subgrade surface for the width of the subgrade to a depth of 6 inches below the subgrade and recompact to the required density in cut sections. In embankments less than 1½ feet, not including subbase gravel, the Contractor will scarify the width of the subgrade, to a depth of 6 inches below the existing ground surface and recompact. Sod existing in the top 6 inches of subgrade will be removed and replaced with satisfactory material. B.Embankment: 1.Preparation of Embankment Areas: Sod which is not salvaged will be thoroughly disked. When undercutting is not required and an existing compacted road surface containing granular material lies within 3 feet of the subgrade surface, the old road surfacing will be scarified to a depth of at least 6 inches and recompacted. 120 Page 1312.Placing Embankment : Sod and topsoil used in the embankment will be thoroughly disked and pulverized. Sod and topsoil will be placed in the fill slopes outside the shoulders of the subgrade or spread in the lower 1 foot of the fill between the roadbed shoulder lines, provided it is at least 4 feet below the top of the subgrade. Sod or topsoil will not be placed within 10 feet of pipe or within 50 feet of box culverts or bridges. Rocks, broken concrete, or other solid materials will not be placed in areas where piling is to be driven or in areas that would interfere with the construction of other structures. Embankments constructed through lakes or swamps will be constructed by end dump methods to an elevation that permits the use of normal construction methods. This elevation will be determined by the Engineer and will be subject to moisture and density requirements. Roadway embankment of earthen material will be placed in horizontal layers not exceeding a loose depth of 8 inches and will be compacted before the next layer is placed. Material may be placed in lifts greater than 8 inches provided test results verify that the specified density for the entire depth of the lift is obtained. Effective spreading equipment will be used on each lift to obtain uniform thickness prior to compacting. Each lift will be thoroughly mixed to provide uniform moisture distribution. As the compaction progresses continuous leveling and manipulating will be required to assure uniform moisture and density. Construction equipment will be routed uniformly over the entire surface of each layer. When embankment is placed and compacted on hillsides, against existing embankments, or when embankment is built half width at a time, slopes steeper than 4:1 will be continuously benched as the embankment is built in horizontal layers. Benching will be of sufficient width to permit operations of placing and compacting equipment. Each horizontal cut will begin at the intersection of the original ground and the vertical sides of the previous cuts. Excavated benching material will be recompacted along with the new embankment material. When excavated material consists predominantly of rock that cannot be placed in 8 inch layers without crushing, pulverizing, or further breaking down the rock, such material may be placed in the embankment in layers not to exceed the thickness of the average size of the larger rocks or 3 feet whichever is less. Each layer will be leveled and smoothed by distribution of spalls and finer fragments of earth. Specified density will not be required. The material will be satisfactorily compacted. These layers will not be constructed above an elevation 1 foot below the finished subgrade. Any rock in excess of 3 feet in any dimension that is placed in the embankment will be positioned outside the finished subgrade shoulder and covered with a minimum of 2 feet of embankment. These rocks will be placed individually and spaced far enough apart to allow for compaction equipment to compact the embankment directly adjacent to the rock. In excavated areas composed mainly of bentonite or unstable material, additional undercutting to a depth necessary to stabilize the areas will be required. 120 Page 132Excavated material which does not contain bentonite may be used to reconstruct undercut sections below the selected subgrade topping zone, and the entire section when no selected subgrade topping is specified. Exposed rock that cannot be hand-passed through a 4-inch square opening within the right-of- way and easement areas will be disposed of. The top 6 inches of embankments will be free of rock fragments and stone that cannot be hand-passed through a 4-inch square opening. Field and farm entrances, ditch and channel blocks, and dikes will be constructed and compacted as directed. Berms for structures requiring slope protection will be finished to grade with ±0.1-foot tolerance to provide a positive support for the slope protection. Other berms will be neatly finished to the same tolerance specified for embankment. When portions of foundations for box culverts are constructed of embankment, the embankment will be constructed to the flow line grade, as specified. The Contractor will be responsible for the stability of embankments prior to acceptance and will repair any portions which have failed. Embankment will not be constructed on frozen ground and frozen material will not be used in construction of embankments. 3.Compaction : Unless the plan notes indicate otherwise, Specified Density Method will be the method of compaction used. a.Specified Density Method : Soil will be compacted within the moisture specification range in accordance with Table 1, unless otherwise specified. Optimum moisture will be determined in accordance with SD 104. Moisture tests will be determined by SD 108. Table 1 Optimum Moisture of Embankment SoilDensity Specification (Percent of Maximum Dry Density)Moisture Specification (Percent of Optimum Moisture) 0% to 15% 95% or Greater -4% to +4% 15% or Greater 95% or Greater -4% to +6% Excess moisture in the embankment material will be removed by drying operations. Earth embankment will be compacted to the percentage of maximum dry density specified in Table 1, as determined by SD 104, unless otherwise specified. Roadway embankment within the area bounded by the toe of the berm slope and extending to a line 100 feet from the bridge end will be compacted to a minimum of 97% of maximum dry density as determined by SD 104. Soil used to construct the embankment in this area will have an optimum moisture of less than 25%. 120 Page 133Density will be determined in accordance with SD 105, SD 106, or SD 114. Prior to placement of granular surfacing materials, the upper 6 inches of subgrade will be reworked and recompacted to moisture and density requirements. This requirement will be waived for A-3 and A-2-4(0) soils. Material retained on a 3/4-inch sieve will be considered durable when, after soaking in water for 24 hours, this retained material cannot readily be broken with the fingers and passed through the sieve. When embankment contains over 40% by weight of durable material passing an 8-inch square opening and retained on a 3/4-inch sieve, specified density requirements will be waived. The embankment will be compacted with sheepsfoot or other approved rollers to the satisfaction of the Engineer. Moisture requirements will be determined in accordance with SD 104, except the optimum and field moisture will be determined using material passing a 3/4-inch sieve. When A-1 soil (gravelly) is encountered, density requirements will be adhered to, the moisture content will be as needed to obtain density. If the material does not contain enough fines to allow for conventional density testing (SD 105 or SD 106), the material will be compacted as specified for A-2-4(0) and A-3 soils. When A-3 soil (fine sand) or A-2-4 (0) soil consisting of primarily fine one grain size sandy material is encountered, specified density requirements will be waived. Embankment will be spread in layers not exceeding an 8-inch loose depth and adequately compacted, with approved vibratory or pneumatic rollers, at the moisture content needed to obtain stability. b.Ordinary Compaction Method: Compaction may be accomplished with any type of equipment which will give uniform satisfactory results. A rolling procedure will be established which will produce densities conforming to Table 1 in Section 120.3 B.3.a , unless otherwise specified. Sufficient tests will be taken during establishment of the rolling procedure to ensure that the required density is being obtained. Changes in material composition, moisture content, or compaction equipment may require that changes be made to the established rolling procedure. Soils will be compacted within the moisture specification range in Table 1 in Section 120.3 B.3.a , unless otherwise specified. The moisture range will be established during the above rolling procedure. Visual confirmation of moisture content will be sufficient after the rolling procedure testing is completed. Excess moisture in the embankment material will be removed by drying operations. The drying under such circumstances will be carried on until the moisture content is such that the required density can be attained. Each layer will be satisfactorily compacted before the next layer is placed. Compaction will be extended to cover the subgrade width in completed cut sections under the same requirements, without additional compensation. Cut sections excavated below grade and refilled with the removed excavation or with selected soils will be compacted in the same manner as embankments. 120 Page 134C.Select Subgrade Topping: The Contractor will develop a plan, which demonstrates that an adequate quantity of the designated material will be salvaged or reserved for select subgrade topping. It will be the responsibility of the Contractor to follow the established grading plan to the extent that an adequate quantity of material for select subgrade topping will be conserved for use. The surface upon which the select subgrade topping will be placed will be constructed to within ±0.2 foot of the required elevation. Compaction of select subgrade topping will be by the specified density method. D.Waste and Surplus Excavation: Surplus excavation and waste material will be disposed of as specified or as ordered by the Engineer. Excess or unsuitable excavated material, including rock and boulders, that cannot be used in embankments may be placed on the side slopes of the nearest fill and placed to maintain a distinct shoulder line. Waste material will be placed the maximum distance possible and at least 1 foot outside and 2 feet below the finished shoulder elevation. Excavated material which contains bentonite will be placed in that portion of an embankment section which is more than 20 feet below the finished subgrade surface, in embankment slopes which are outside the subgrade shoulder line, or in designated waste areas. During placement of this material in the embankment, the thickness of the total placement in any one area will be as directed. E.Unclassified Excavation, Digouts: When granular material is used for backfill, the excavated area will extend to a daylight point so that lateral drainage is provided. The exposed undercut surface will be compacted prior to backfilling. The existing gravel will be salvaged before and replaced after the unstable material has been removed. F.Option Borrow Excavation: Suitable materials removed from optioned borrow sources will be used in the embankments. Optioned borrow sources will be graded to a neat and sightly appearance in accordance with grades, slopes, and requirements of the option agreement and to permit accurate measurement of quantities. G.Borrow Excavation: Suitable materials removed from borrow sources will be used in the embankments. Borrow sources will be graded to a neat and sightly appearance in accordance with grades, slopes, and requirements of the plans and to permit accurate measurement of quantities. H.Water: Sufficient equipment will be available to apply the quantity of water required to secure the proper compaction before evaporation, absorption, or drainage prevents or interferes with the specified results. Moisture content of material will be uniform for the full depth and extent of each layer. I.Pit Run: Pit run material will be compacted to 95% or greater of maximum dry density as determined by the specified density method in layers not exceeding 8 inches loose depth. If the material does not contain enough fines to allow for conventional density testing (SD 105 or SD 106), the material will be compacted as specified for A-2-4(0) and A-3 soils. 120 Page 135120.4 METHOD OF MEASUREMENT A.Excavation: Excavation will be measured to the nearest cubic yard. Measurement of excavation will include unsuitable material excavated and removed to obtain proper compaction in cut sections and in foundations for fill sections. Suitable material temporarily removed and replaced to facilitate compaction, except undercutting required in Section 120.3 A.3, second paragraph, will not be measured for payment. Accepted quantities of excavation will be measured in its original position by cross sectioning. The area excavated will include over breakage or slides not due to carelessness of the Contractor. Where it is impractical to measure material by this method, acceptable methods involving three dimensional measurements or measurement in the hauling vehicle may be used. With written agreement between the Contractor and the Department, excavation which conforms to the staked lines and grades may be computed using original cross sections and staked sections. When specified, plan quantity will be the measurement for payment, provided the project is constructed to the lines and grades specified. Measurements will not be made except those necessary to determine that the work has been performed in conformance with the plans or to measure changes which increase or decrease quantities. Such areas will be measured, differences in quantities computed and deductions or additions made. When no provisions exist for payment on a contract quantity basis, final settlement may be made on a contract quantity basis provided a written agreement between the Contractor and the Department is executed prior to final measurement. Unclassified excavation to be performed in connection with box culvert construction will be limited to that within the right-of-way limits. The quantity for this unclassified excavation will be plans quantity except as otherwise specified. B.Embankment: Measurement of embankments will not be made. C.Select Subgrade Topping: Measurement will be by plan quantity. Quantities will be based on computed embankment volume plus shrinkage. If changes in plan dimensions or locations are authorized, the final quantity will be determined by the as constructed volume using the shrinkage factor shown on the plans for the particular area of work. Final field measurement will not be made except that required to determine that the work was completed in accordance with plans and to document changes. Material used for construction of the select subgrade topping will also be measured as unclassified excavation. D.Waste: This work will not be measured but will be subsidiary work pertaining to the several classes of excavation. E.Option Borrow Excavation: Option borrow excavation will be measured in its original position by cross sectioning. Volumes will be computed in cubic yards. 120 Page 136Original cross sections will be taken prior to removal of any material and final cross sections will be taken following replacement of topsoil. Salvaged topsoil from the optioned borrow sources will be included as option borrow excavation. The quantity of topsoil stockpiled and respread on optioned borrow sources will be determined by measuring the stockpiles prior to removal of the material from the stockpiles. F.Contractor Furnished Borrow Excavation: Contractor furnished borrow excavation will be measured in its original position by cross sectioning. Volumes will be computed in cubic yards. Original cross sections will be taken prior to removal of any material and final cross sections will be taken following replacement of topsoil. Salvaged topsoil will not be measured. G.Borrow Unclassified Excavation: Borrow unclassified excavation will be measured in its original position by cross sectioning. Volumes will be computed in cubic yards. Original cross sections will be taken prior to removal of any material and final cross sections will be taken following replacement of topsoil. Salvaged topsoil stockpiled from the borrow sources will be included as borrow unclassified excavation. The quantity of topsoil stockpiled and respread on borrow sources will be determined by measuring the stockpiles prior to removal of the material from the stockpiles. H.Haul: Measurement of authorized haul will be made based on material being taken from excavation and hauled the shortest distance possible. The haul distance for material moved from outside the roadway will be measured along the shortest satisfactory route. The haul distance for material obtained from the roadway and placed inside the roadway will be measured along the centerline of the roadway. Haul will be the product obtained by multiplying the number of units of excavation removed from its original position by the mean distance hauled. The distance between the center of gravity of the excavation and the center of gravity of the embankment will be the haul distance. I.Water: Water will be measured by the thousand gallons (MGal.) to the nearest 0.1 MGal. Measurement will be by use of calibrated tanks or an approved water metering device which records in gallons. Prior to using any water metering device, the Contractor will furnish a certified statement that such device conforms to AWWA requirements. The statement will show that the device has been calibrated within the past year. Should subsequent measurements prove the measurements are unreliable another certified device producing satisfactory measurements will be furnished. The head of each device will be sealed when calibrated and the absence of such seal will be cause to prohibit its use. J.Pit Run: Pit Run will be measured to the nearest 0.1 ton. Water and materials which are paid for under separate items will not be measured under this item. 120 Page 137120.5 BASIS OF PAYMENT A.Excavation: Completed and accepted work will be paid for at the contract unit price per cubic yard for the class of excavation involved. Payment will be full compensation for excavation; construction and compaction of cuts and embankments; shaping of slopes; finishing of surface; disposal of surplus materials; completion of subgrade, shoulders, and roadway; and maintenance. Scarifying, shaping, and recompacting as required under Section 120.3 A.3 will be incidental to the unit price bid for excavation. Separate payment will not be made. 1.Unclassified Excavation: Excavation will be paid for at the contract unit price for unclassified excavation unless contract items provide for other classes of excavation. When no bid item or other mention of rock is shown in the contract and rock is encountered that requires blasting to excavate, such rock excavation will be paid for as per Section 9.4. Notification will be given far enough in advance to ascertain the extent and nature of the rock formation before removal is begun. Payment as rock excavation will not be made unless notification is given. 2.Unclassified/Rock Excavation: Unclassified/rock excavation will be paid for at the contract unit price for unclassified/rock excavation. 3.Rock Excavation: When an item for rock excavation is provided, payment will be made at the contract unit price. 4.Muck Excavation: When an item for muck excavation is provided, payment will be made at the contract unit price. 5.Unclassified Excavation, Digouts: When an item for unclassified excavation, digout is provided, payment will be made at the contract unit price. 6.Undercutting: Undercutting as described in Section 120.3 A.3 with corrections made for portions not accomplished and for portions not shown in the plans but ordered by the Engineer will be paid for at the contract unit price. Payment will be full compensation for work over and above that normally required for unclassified excavation. B.Embankment: Embankment will not be paid for directly but will be subsidiary work pertaining to the several classes of excavation. C.Select Subgrade Topping: Select subgrade topping will be paid for at the contract unit price per cubic yard. Payment will be full compensation for work over and above that normally required for embankment construction. D.Waste: Waste will not be paid for directly but will be subsidiary work pertaining to the several classes of excavation. E.Option Borrow Excavation: Option borrow excavation will be paid for at the contract unit price per cubic yard. Payment will be full compensation for excavation and furnishing the material on the project; construction and compaction of embankments; shaping of slopes; 120 Page 138finishing of surface; completion of subgrade, shoulders, and roadway; maintenance; and for furnishing materials (except topsoil), labor, and incidentals required for restoration of the pit. Topsoil stockpiled from the option borrow source will be respread and paid for at the contract unit price per cubic yard of option borrow excavation and placing topsoil. When the Contractor uses a pit not designated on the plans, the payment for topsoil, seeding, fertilizing, and mulching will be plans quantity of the pit designated on the plans. F.Contractor Furnished Borrow Excavation: Contractor furnished borrow excavation will be paid for at the contract unit price per cubic yard. Payment will be full compensation for excavation and furnishing the material on the project; construction and compaction of embankments; shaping of slopes; finishing of surface; completion of subgrade, shoulders, and roadway; maintenance, and for furnishing materials, labor, and incidentals required for restoration of the pit. Topsoil, seed, fertilizer, and mulch for the restoration of the pit will be incidental to the unit price per cubic yard of Contractor furnished borrow excavation. G.Borrow Unclassified Excavation: Borrow unclassified excavation will be paid for at the contract unit price per cubic yard. Payment will be full compensation for excavation and furnishing the material on the project; construction and compaction of embankments; shaping of slopes; finishing of surface; completion of subgrade, shoulders, and roadway; maintenance; and for furnishing materials (except topsoil), labor, and incidentals required for restoration of the pit. Topsoil stockpiled from the borrow source will be respread and paid for at the contract unit price per cubic yard of borrow unclassified excavation and placing topsoil. H.Haul: This work will not be paid for directly but will be subsidiary work pertaining to the several classes of excavation. When, through no fault of the Contractor, changes cause an increase in the necessary haul, the resulting additional haul (total length of haul less average plan shown haul for the entire project) will be paid in accordance with Section 9.3. I.Water: Water will be paid for at the contract unit price per thousand gallons (MGal). J.Pit Run: Pit Run will be paid for at the contract unit price per ton. Payment will be full compensation for furnishing and placing materials, labor, equipment, and all incidentals required. 205 Page 139205 DUST CONTROL
205.1DESCRIPTION
This work will consist of the application of a magnesium chloride solution, a calcium chloride solution, or water to a prepared surface for dust control.
205.2MATERIALS
A.Dust Control Chloride: Dust control chloride materials will conform to Section 891. B.Water for Dust Control: Water for dust control will be furnished by the Contractor and will be free from injurious matter.
205.3CONSTRUCTION REQUIREMENTS
A.Dust Control Chlorides: Dust control chlorides will be uniformly applied under pressure in liquid form by mechanical equipment. The equipment must be such that the application rate can be set, determined, and changed as required. The rate of application will be 1.2 pounds per square yard of surfacing. This weight will be the anhydrous weight of calcium chloride or magnesium chloride in the solution as determined from the Certificate of Compliance. The material may be applied in one or two applications. Additional applications or spot applications may be necessary to maintain dust control. 1.Short Term Application: The dust control material will be surface applied. 2.Long Term Application: The dust control material will be blended into the top 1 to 2 inches of the gravel surfacing. The addition of water may be necessary to adequately compact the material. Compaction will be required to the satisfaction of the Engineer. No separate payment will be made for water added for compaction. B.Water for Dust Control: Water will be surface applied to the satisfaction of the Engineer.
205.4METHOD OF MEASUREMENT
A.Dust Control Chlorides: Dust control chlorides long term application and short term application will be measured by the anhydrous weight in pounds. The weight of anhydrous material will be based on the actual concentration to the nearest 0.1% as determined by the Department’s Materials & Surfacing Central Laboratory and the actual weight of the solution applied. B.Water for Dust Control: Water for dust control will be measured by the thousand gallons (MGal.) to the nearest 0.1 MGal. Measurement will be by use of calibrated tanks or an approved water metering device which records in gallons.