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R-79-263 - 12/13/1979TEXAS y • RESOLUTION NO.' p (O IC-, WHEREAS, City Council' deems it advisable to adopt and approve specifications for the construction of subdivi- sion improvements; and ,. WHEREAS, the Council wishes to adopt and approve the specifications which are attached hereto, Now Therefore BE IT RESOLVED BY THE COUNCIL OF THE CITY OF ROUND ROCK, That the Council of the City of Round Rock hereby adopts and approves the specifications for the construction of sub- division improvements as set forth in the attachment hereto which is incorporated herein for all purposes. RESOLVED this /5 day of Dece . er, 1979. ATTEST: NNE LAND, ity Secretary LARRY L. ONN, Mayor City of Round Rock, Texas A NOTES FOR REFERENCING CITY OF AUSTIN SPECIFICATIONS FOR SUBDIVISION WORK WITHIN THE CITY OF ROUND ROCK The current City of Austin Standard Construction Specifications of Water and Wastewater Department and Engineering Department are incorporated into this project by reference and they shall be applied to this project except as modified in these specifications and on the plans. Wherever the term "City of Austin" is used in the Austin specifications, it shall.be: construed to mean'the City:of Round Rock. STREET 1. Subgrade density tests are required prior to depositing base material. 2. Base density and thickness tests are required prior to application of prime coat. 3. All testing shall be made by an independent laboratory at the subdivider's expense. An authorized representive of the City shall be present when such test are made. The number of tests required shall be determined by the City Engineer or his authorized representative. '4. Pavement surface shall be Type "D" hot -mix, hot -lay asphaltic concrete with a minimum asphalt content of 5 %. 5. Backfill.behind curbs shall be compacted to obtain a minimum of 95% of maximum density. Material used for curb backfill shall be primarily -,- granular and free from boulders larger than 6" in their greatest dimension. 6. For Item No. 203 in Austin Specifications, substitute Item No. 203 attached. • 7. For Item No. 210 in Austin Specifications, substitute Item No. 210 attached. WATER 1. Water mains shall be PVC or asbestos cement pipe. The type, size and class of pipe shall be shown on the plans. 2. PVC pipe used for water mains shall conform to AWWA C -900. 3. Valves shall be Mueller iron -body gate value with ends as shown on plans_ 4. Service material shall be type "K" copper tubing or 160 psi polyethelyne .tubing conformins to ASTM D2737, SDR 9 with brass fittings. 5. Fire hydrants shall be 3 -way Mueller, Improved AWWA type with pump no2zle for 4 1/2" fire hose. A 6" gate valve and valve box shall be provided on each fire hydrant lead. 6. Density of backfill trenchs under pavement shall be tested by an independent laboratory. Such testing will be paid for by the subdivider, and an authorized representative of the City of Round Rock shall be present when such test are made. SEWER 7. All testing of pipe shall be done under the supervision of the City,,, and the contractor shall perform such tests as required and furnish all equipment and material for same. 8. Sterilization of mains shall be done under the supervision of the City, and the contractor shall perform such sterilization and furnish all material and equipment for same. The City will be responsible for bacteriological tests. 1. Sewer pipe shall be PVC or vitrified clay pipe. 2. The type and size of pipe shall be shown on the plans. 3. The type of manhole shall be shown on the plans. 4. Density of backfilled tranches under pavement shall be tested by an independent laboratory. Such testing will be paid for by the subdivider, and an authorized representive of the City of Round Rock shall be present when such test are made. 5. All testing of pipe shall be done under the supervision of the City, and the contractor shall perform such test as required and furnish all material and equipment for same. - -' ADOPTED this day of 19 by the City Council of the . --- City of Round Rock, Texas. ATTEST: City Secretary Mayor CITY OF ROUND:ROCK Item No. 203 Lime Treatment for Materials in Place 203.1 Description This item shall consist of treating the subgrade, existing subbase or existing base by the pulverizing, addition of lime, mixing and compacting the mixed material to the required density. This item applies to natural ground, embankment, or existing pavement structure and shall be constructed as specified herein and in conformity with the typical sections', lines and grades as shown on the plans or •as.established by the Engineer. 203.2 Materials 1. "Hydrated Lime and Lime Slurry" named or referred to in this item shall meet•and be the same as the types and grades specified in the State Depart - ment of Highways and Public Transportation, Item 264, entitled "Hydrated Lime and Lime Slurry" from their 1972 Standard Specifications for Construction of Highways, Streets and Bridges. 2. When Type B, Commercial Lime Slurry, is specified, the Contractor shall select, prior to construction, the grade to be used and shall notify the Engineer in writing before changing from one grade to another. 3. If the minimum design strength or the percent of lime to be used for the treated subgrade, existing subbase or existing base is specified, preliminary tests - far substantiation shall be performed in accordance with SDHPT Test Method Tex - 121 -E. In no case shall the amount of lime used in construction be less than that recommended in Fig. 3 of that test method, but may be more depending on Tex -121 -E test results. 4. It is the intent of this specification that the subgrade soil, subbase or existing base which is to be lime stabilized, be substantially free of • organic matter such as concentrations of weeds, grass, leaves, rotting wood and other such organic matter deleterious to all kinds of soil stabilization, be removed, wasted and not included in the pavement sections or in the secondary subgrade. 203.3 Equipment 1. The machinery, tools and equipment necessary for proper prosecution of the work shall be on the project and approved by the Engineer prior to the beginning of construction operations. All machinery, tools and equipment used shall be maintained in a satisfactory and workmanlike manner. 2. Hydrated lime shall be stored and handled in closed weatherproof containers until immediately before distribution on the street. If storage bins are used they shall be completely.enclosed. Hydrated lime in bags shall be stored in weatherproof buildings with adequate protection from ground dampness. 3. If lime is furnished in trucks, each truck shall have the weight of lime certified on public scales or the Contractor shall place a set of standard platform truck scales or hopper scales at a location approved by the Engineer. 4...If lime is furnished in bags, each beq shall bear the manufacturer's certified weight. Bags varying more than 5 percent from the weight may be rejected and the average weight of bags in any shipment, as shown by weighing 50 bags taken at random, shall not be less than the manufacturer's certified weight. 203.4 Construction Methods 1. General It is the primary requirement of this specification to secure a completed course of treated material containing a uniform lime mixture free from loose or segregated areas, of uniform density and moisture content, well bound for its full depth and with a smooth surface suitable for placing subsequent courses. It shall be the responsibility of the Contractor to regulate the sequence of his work, to use the proper amount of lime, maintain the work and rework the courses as necessary to meet the above requirements. The street subgrade shall be constructed and shaped to conform to the typical sections, lines and grades as shown on the plans or as established by the Engineer. The material, either before or after lime is added, shall be excavated to the secondary grade (proposed) bottom of lime treatment) and removed or windrowed to expose the secondary grade. The secondary grade shall be scarified for a minimum depth of 6 inches. The scarified material shall be pulverized, wetted, mixed and compacted in lifts not to exceed 4 inches in thickness and when finished, shall conform to the sections, lines and grades as shown on the plans or as established by the Engineer. The moisture content of the compacted subgrade at the time of compaction shall not be more than two percentage points below the optimum moisture content for the faw soil as determined by SDHPT Test Method Tex - 113 -E. The dry density of the compacted subgrade shall not be more than 102% nor less than 95% of the dry density of the raw soil as determined by SDHPT Test Method Tex - 113 -E. The moisture content of clay subgrade soils in the compacted secondary subgrade shall be maintained within + 4 percent of its compaction moisture content until covered by subsequent layers of material unless otherwise approved by the Engineer. Should wet or unstable areas develop in the secondary subgrade immediately prior to lime treatment of subgrade layers the unstable materials below the secondary subgrade shall be corrected, as directed by the Engineer, by scarifying, adding lime and compacting until it is of uniform stability. If the contractor elects to use a cutting and pulverizing machine that will remove the subgrade material accurately to the secondary grade and pulverized the material at the same time, there shall be no lessening of the requirement of exposing the secondary grade material and treatment as set forth above. The contractor may further elect to use the cutting and pulverizing machine to process the secondary grade material to a minimum depth of 6 inches. When cutting pulverizing machines are used the contractor may, when approved by the Engineer, elect to compact the secondary subgrade material in one lift; however, there shall be no lessening of moisture - density requirements, or maintenance of same as set forth above. This method will be permitted only where a machine is provided which will insure that the material is cut uniformly to the proper depth and which has cutters that will plane' secoridary:grade to a smooth surface over the entire width of the cut. The machine shall be of such design that a visible indication is given at all times that the machine is cutting to the proper depth. 2 Application Lime shall be spread only on the area where the first mixing operations can be completed during the same working day. The application and mixing of lime with the material shall be accomplished by . methods hereinafter described as '•'Dry Placing" or "Slurry Placing.;'. (a) Dry Placing (When approved by the Engineer.) The lime shall be spread by an approved spreader or by bag distribution at the rates shown on the plans or as directed by the Engineer. The lime shall be distributed at a uniform rate and in such manner as to reduce the scattering of lime by wind to a minimum. Lime shall not be applied when wind conditions, in the opinion of the Engineer, are such that blowing lime - becomes objectionable to traffic or adjacent property owners. A motor grader will not be used to spread the lime. The material shall be sprinkled as directed by the Engineer, until the proper moisture content has been secured. (b) Slurry Placing The lime shall be mixed with water in trucks with approved distributors and applied as a thin water suspension or slurry. The distribution of lime at the rates shown on the plans or as directed by the Engineer shall be attained by successive passes over a measured section of roadway until the proper moisture and lime content has been secured. The distributor truck shall be equipped with an agitator which will keep the lime and water in a uniform mixture. 3 Mixing The mixing procedure shall be the same for "Dry Placing" or "Slurry Placing" as hereinafter described. (a) First Mixing The material and lime shall be thoroughly mixed by approved road mixers or other approved equipment, and the mixing continued until, in the opinion of the Engineer, a homogeneous, friable mixture of material and lime is obtained, free from all clods or lumps. Materials containing plastic clays or other material which will not readily mix with lime shall be mixed as thoroughly as possible at the time of the lime application, brought to the proper moisture content and left to cure 1 to 4 days as • directed by the Engineer. During the curing period the material shall be kept moist as directed. (b) Final Mixing - After the required curing time, the material shall be uniformly mixed by approved methods. If the soil binder -lime mixture contains clods, they shall be reduced in size by raking, blading, discing, harrowing, scarifying or the use of other approved pulverization methods so that when all nonslaking aggregates retained on the No. 4 sieve are removed -the remainder -of -the material shall meet the following requirements when tested dry by laboratory sieves: Percent Minimum Passing 1 -3/4" Sieve 100 Minimum Passing No. 4 Sieve 60 During the interval of time between' application and mixing, hydrated • lime that has been exposed to the open air for a period of 6 hours or more or to excessive loss due to washing or blowing will not be accepted for payment. 4. Compaction Compaction of the mixture shall begin immediately after final mixing and in no case later than 3 calendar days after final mixing, unless approval is obtained from the Engineer. The material shall be aerated or sprinkled as necessary to provide the optimum moisture. Compaction shall begin at • the bottom and shall continue until the entire depth of mixture is uniformly compacted. If the total thickness of the material to be treated cannot be mixed in one operation, the previously mixed material shall be bladed to a windrow just beyond the area to be treated and the next layer mixed with lime as specified in Number 3. The first layer of the treated material shall be compacted in such a manner that the treated material will not be mixed with the underlying material. The course shall be sprinkled as required and compacted to the extent necessary to provide the density specified below as determined by the use of the compaction ratio method: Description For lime treated subgrade, existing subbase or existing base that will receive subsequent subbase or base courses. For lime treated existing subbase or existing base that will receive surface courses. The testing will be as outlined in SDHPT Test Method Tex -113 -E or other approved methods. In addition-to the requirements specified for density, the full depth of the material shown on the plans shall be compacted to the extent necessary to remain firm and stable under construction equipment. After each section is completed, tests as necessary will be made by the Engineer. If the material fails to meet the density requirements, it shall be reworked as necessary to meet these requirements. Additional lime shall be added, at the sole expense of the contractor, when any lime stabilized soil is reworked due to insuffient densities. It shall be the sole responsibility of the Engineer either to accept the reworked section or sections, or to require new Tex -113 -E moisture- density tests to determine the new density requirements on the then, different treated sections. Throughout this entire operation the shape of the course shall be maintained by blading and the surface upon completion shall be smooth and in conformity with the typical section shown on the plans and to the established lines and grades. Should the material, due to any reason or cause, lose the required stability density and finish before the next course is placed or the work is accepted, it shall be recompacted and refinished at the sole expense of the Contractor. 203.5 Finishing, Curing and Preparation of Surfacing After the final layer or course of the lime treated subgrade, subbase or base has been compacted, it shall be brought to the required lines and grades in accordance with the typical sections. The competed section shall then be finished by rolling Density, Percent Not less than 95 except when otherwise shown on the plans. Not less than 98 except when otherwise shown on the plans. as %directed with a pneumatic tire or other suitable roller sufficiently light to prevent hair cracking. Where continued reshaping and rolling of lime treated materials the contractor, at his option, may blade off and waste the top 3/4 inch of retempered material or he may re- sprinkle with additional lime slurry and retain the material. In any case there shall be no final reduction in section thickness due to any blading off of retempered material. The completed section shall be moist -cured for a minimum of 7 days before further courses are added or any traffic is permitted, unless otherwise directed by the Engineer. In cases where subgrade treatment or subbase sets up sufficiently to prevent objectionable damage from traffic, such layers may be opened to traffic 2 days after compaction. If the plans provide for the treated material to be sealed or covered by other courses of material, such seal or course shall be applied within 14 days after final mixing is completed, unless otherwise directed by the Engineer. 203.6 Measurement Lime treatment of the subgrade, existing subbase, and existing base shall be measured by the square yard to neat lines as shown on the typical sections. When Type A, Hydrated Lime is used, the quantity of lime will be measured by the ton of 2,000 pounds, dry weight. When Type B, Commercial Lime Slurry, is used, the quantity of lime shall be calculated from the required minimum percent solids based upon the use of Grade 1, Grade 2, or Grade 3 as follows: Grade 1: The "Dry Solids Content" shall be at least 31 percent by weight of the slurry and the quantity of lime will be calculated by the ton of 2000 pounds -based on the 31 percent, ad delivered on the road. - Grade 2: The "Dry Solids Content" shall be at least 35 percent by weight of the slurry and the quantity of lime will be calculated by the ton of 2000 pounds based on the 35 percent, as delivered on the road. Grade 3: The "Dry Solids Content" shall be at least 46 percent by weight of the slurry and the quantity of lime will be calculated by the ton of 2000 pounds based on the 46 percent, as delivered on the road. 203.7 Tolerances The Engineer may elect to accept the work, provided that not more than 20% of the density tests performed each day are outside the specified density require- ments, from SDHPT Test Method Tex -113 -E testing, by no more than 2 pounds per cubic foot and where no two consecutive tests on continuous work are outside the specified limits. Density tests shall be determined by SDHPT Test Method Tex -115 -E or by other methods approved by the Engineer. • It shall be the responsibility of the Contractor as set forth under "Description" and "Construction Methods" above, to- construct in accordance with the specifications herein to the typical sections, lines and grades shown on the plans or as established by the Engineer. Depth tests shall be made for total thickness prior to final acceptance of the work. Thicknesses which are within 1/4 inch of plan thicknesses shall be construed as meeting plan thicknesses. Thicknesses deficient by more than 1/4 inch but less than 1/2 inch may be accepted by the Engineer provided not more than any 300 linear feet of continuous work is found to be deficient in thickness. When pavement is found to be over 1/2 inch deficient in thickness the Contractor shall bring the section, found to be deficient, to the correct thickness by laying hot - mix, hot -lay surfacing at his sole expense. Coring Thickness determinations shall be made in accordance with SDHPT Test Method Tex - 424-A or other methods approved by the Engineer. 203.8 Payment Work performed and materials furnished as prescribed by this item and measured as provided under "Measurement" will be paid for as follows: Lime will be paid for at the unit price bid per ton of 2000 pounds for "Lime." "Lime Treated Subgrade," "Lime Treated Existing Subbase" and "Lime Treated Existing Base," will be paid for at the unit price bid per square yard. The unit prices bid shall each be full compensation for preparing the roadbed; for furnishing all materials; for all freight involved; for public scales weighing charges or for furnishing scales and labor involved in weighing the material; for loosening, mixing, pulverizing, spreading, drying, application of lime, sprinkling, rolling, shaping, maintaining; and for all - manipulations, labor, equipment, fuels, tools and incidentals necessary to complete the work. Payment will be made under: Pay Item No. 203 -A: Lime treated subgrade -Per Square Yard. Pay Item No. 203 -B: Lime treated existing subbase -Per Square Yard. Pay Item No. 203 -C: Lime treated existing base -Per Square Yard. Pay Item No. 203 -D: Lime -Per Ton. Item No: 210 Flexible Base (Crushed Stone) 210.1. Description "Flexible Base: shall consist of a foundation course for surfacing, pavement or other base courses; shall be composed of crushed stone or gravel, and shall be constructed as herein specified in one or more courses in conformity with the typical sections shown on the plans and to the lines and grades as established by the Engineer. 210.2 Material The material shall be crushed or uncrushed as necessary to meet the requirements hereinafter specified, and shall consist of durable stone or gravel, crushed and /or screened to the required particle size, with or without other approved fine sized material. The material shall be from approved sources. 210.3 Grades It is the intent of this specification that unless otherwise indicated on the plans, the final course of the base material shall consist of Grade 1 and other base courses or subbase materials may consist of Grades 1 or 2. The final base courses shall be defined as the design or plan thickness of flexible base, exclusive of surfacing, up to a thickness of 8 inches. That depth exceeding 8 inches in the thicker bases are referred to as other base courses or subbase materials. Both grades shall, when tested by SDHPT standard laboratory test procedures, meet the physical requirements as set forth in the specification test limits tabulation. Testing of flexible base materials shall be in accordance with the following Texas Highway Department standard laboratory test procedures: 1) Preparation for Soil Constants and Sieve Analysis Tex -101 -E 2) Liquid Limit Tex -104 -E 3) Plastic Limit Tex -105 -E 4) Plasticity Index Tex -106 -E 5) Sieve Analysis Tex - 110 -E 6) Wet Ball Mill Tex -116 -E 7) Triaxial Test Tex -117 -E (Part II Unless otherwise specified on the plans,, job - control samples for testing the materials for Soil Constants, Gradation and Wet Ball Mill shall be taken prior to the compaction operations. Unless otherwise specified on the plans, all base material will be stockpiled after crushing; tested by the testing agency designated by the City of Round Rock; and approved by the City of Round Rock prior to being hauled to the project site. The material shall be well graded and when properly tested, shall meet the following requirements: Crushed or Broken Aggregate 210.4 Tolerances PHYSICAL REQUIREMENTS, FOR FLEXIBLE BASE ' Minimum compressive strength for'..both Grades.1 and 2 when subjected to the triaxial test: 35 PSI to 0 PSI, lateral pressure and.175 PSI at 15 PSI lateral pressure, unless otherwise designated on the plans. *Unless otherwise shown on plans, the maximum increase in material passing the number 40 sieve resulting from the Wet Ball Mill Test shall not exceed 20. The WBM test is not required on flexible base consisting of crushed siliceous gravel. The limits establishing reasonably close conformity with the specified gradation and plasticity index are defined by the following: The Engineer may accept the material, providing not more than 2 out of 10 consecutive gradation tests performed are outside the:specified''limit•'on any individual or combination of sieves by no more than 5% and where no two consecutive tests are outside the specified limit. The Engineer may accept the material providing not more than 2 out of 10 consecutive plasticity index samples tested are outside the specified limit by no more than 2 points and where no two consecutive tests are outside the specified limit. 210.5 Construction Methods 1. Preparation of Subgrade The street shall be prepared and shaped in conformity with the typical sections shown on plans and to the lines and grades as established by the Engineer. Prior to placement of any flexible base or subbase material the subgrade clay soil shall be scarified to a minimum depth of 6 inches. The scarified material shall be pulverized, wetter, mixed and compacted in lifts not to exdeed-- 4 inches in thickness and when finished, shall conform to the sections, lines and grades as shown on the plans or as established by the Engineer. The moisture content of the compacted subgrade at the time of compaction shall not be more than two percentage points below the optimum moisture content for the raw soil as determined by SDHPT Test Method Tex - 113 -E. The dry density of the compacted subgrade shall not be more than 102% nor less than 95% of the dry density of the raw soil as determined by SDHPT Test GRADES Grade 1 Grade 2 Retained on % Retained on % Sq. Sieve Sq. Sieve 1 -3/4" - 0 1 -3/4" 0 -10 7/8" _10 -35 No. 4 45 -75 3/8" 30 -50 No. 40 60 -85 No. 4 45 -65 Max LL 40 No. 40 70 -85 , Max P1 12 Flax LL 35 *Max Wet Max P1 10 Ball Mill.... 50 *Max Wet Ball Mill 40 Crushed or Broken Aggregate 210.4 Tolerances PHYSICAL REQUIREMENTS, FOR FLEXIBLE BASE ' Minimum compressive strength for'..both Grades.1 and 2 when subjected to the triaxial test: 35 PSI to 0 PSI, lateral pressure and.175 PSI at 15 PSI lateral pressure, unless otherwise designated on the plans. *Unless otherwise shown on plans, the maximum increase in material passing the number 40 sieve resulting from the Wet Ball Mill Test shall not exceed 20. The WBM test is not required on flexible base consisting of crushed siliceous gravel. The limits establishing reasonably close conformity with the specified gradation and plasticity index are defined by the following: The Engineer may accept the material, providing not more than 2 out of 10 consecutive gradation tests performed are outside the:specified''limit•'on any individual or combination of sieves by no more than 5% and where no two consecutive tests are outside the specified limit. The Engineer may accept the material providing not more than 2 out of 10 consecutive plasticity index samples tested are outside the specified limit by no more than 2 points and where no two consecutive tests are outside the specified limit. 210.5 Construction Methods 1. Preparation of Subgrade The street shall be prepared and shaped in conformity with the typical sections shown on plans and to the lines and grades as established by the Engineer. Prior to placement of any flexible base or subbase material the subgrade clay soil shall be scarified to a minimum depth of 6 inches. The scarified material shall be pulverized, wetter, mixed and compacted in lifts not to exdeed-- 4 inches in thickness and when finished, shall conform to the sections, lines and grades as shown on the plans or as established by the Engineer. The moisture content of the compacted subgrade at the time of compaction shall not be more than two percentage points below the optimum moisture content for the raw soil as determined by SDHPT Test Method Tex - 113 -E. The dry density of the compacted subgrade shall not be more than 102% nor less than 95% of the dry density of the raw soil as determined by SDHPT Test - The•moisture content of clay subgrade.soils in the compacted subgrade shall be maintained within + 4 percent of its compaction moisture content until cove'r`ed by subsequent layers of material unless otherwise approved by the Engineer. The intent of this requirement is to insure that swelling clay subgrade soils be placed in the manner to lessen swell and heaving and then to maintain this condition until covered by subsequent materials. Should wet or unstable areas develop in the subgrade just prior to placement of base or subbase materials, such areas shall be corrected as directed by the Engineer. The surface of the subgrade shall be finished to line and grade as established and in conformity with the typical section shown on plans, and any deviation in excess of 1/4 inch in cross section and in a- length of 10 feet measured longitudinally shall be corrected by loosening, adding or removing material, reshaping and recompacting by sprinkling and rolling. Sufficient subgrade shall be prepared in advance to insure satisfactory prosecution of the work. Material excavated in the preparation of the subgrade shall be utilized in the construction of slopes or otherwise disposed of as directed, and any additional material required for the completion of slopes shall be secured from sources indicated on plans or designated by the Engineer. Blue tops shall be set by the contractor for subgrade on center -line, quarter points and curb lines at intervals not exceeding 50 feet. 2. First Course Immediately before placing the base material, the subgrade shall be checked as to conformity with grade and section. The thickness of each course shall not exceed 6 inches and will be equal increments of the total depth. The material shall be delivered in approved vehicles of a uniform capacity and it shall be the charge of the Contractor that the required amount of specified material shall be delivered in each 100 -foot station. Material deposited upon the subgrade shall be spread and shaped the same day unless otherwise directed by the Engineer in writing. In the event inclement weather or other unforeseen circumstances render impractical the spreading of the material during the first 24 -hour period the material shall be scarified and spread as directed by the Engineer. The material shall be sprinkled, if directed, and shall then be bladed, dragged and shaped to conform to typical sections as shown on plans. All areas and "nests" of segregated course or fine material shall be corrected or removed and replaced with well graded material, as directed by the Engineer. If additional binder is considered desirable or necessary after the material is spread and shaped. it shall be furnished . and applied in the amount directed by the Engineer. Such binder material shall be carefully and evenly incorporated with the material in place by scarifying,'harrowing, brooming or by other approved methods.• The course shall be sprinkled as required and compacted to the extent necessary to provide not less than the percent density as hereinafter specified under "Density." In addition to the requirements specified for density, the full depth of flexible base shown on the plans shall be compacted to the extent necessary to remain firm and stable under construction equipment. After each section of flexible base is completed, tests as necessary will be made by the Engineer. If the material fails to meet the density requirements, it shall be reworked as necessary to meet these requirements. Throughout this entire operation the shape of the course shall be maintained by blading, and the surface upon completion shall be smooth and in conformity with the typical section shown on the plans and to the established lines and grades. In that area on which pavement is to be placed, any deviation in excess of 1/4 inch in cross section and in a length of 10 feet measured longitudinally shall be corrected by loosening, adding or removing material, reshaping and recompacting by sprinkling and rolling. All irregularities; depressions or weak spots which develop shall be corrected immediately by scarifying the .'are4s' affected, adding suitable material'ds required, reshaping and reeompacting by sprinkling and rolling. Should the base course, due to any reason or cause, lose the required stability, density and finish before the surfacing is complete, it shall be recompacted and refinished at the sole expense of the Contractor. 3. Succeeding Courses Construction methods shall be the same as prescribed for the first course. Blue tops shall be set by the contractor for finished base grade on center- ' line and intermediate points not exceeding 11 feet between points at 50 foot intervals. 4. Density Each course of flexible base shall be compacted to not less than 100 percent density when tested in accordance with THD Test Method TEX- 113 -E. Field density determination shall be made in accordance with approved methods. 210.6 Measurement "Flexible Base" will be measured by the square yard at depths specified in the proposal for the area of street as shown on the typical sections of the plans or otherwise provided for in the contract documents, complete in place; by the cubic yard, loose vehicle measurement; or, by the cubic yard, complete in place, as indicated in the proposal. 210.7 Payment This item will be paid for at the contract unit price bid for "Flexible Base" which price shall be full compensation for all work herein specified. including the furnishing, hauling, and placing of all materials, for all water required and for all equipment, tools, labor and incidentals necessary to complete the work. Payment will be made under: Pay Item No. 210 -A: Flexible Base (complete in place) -Per Square Yard, or Pay Item No. 210 -B: Flexible Base (loose vehicle measurement) -Per Cubic Yard, or Pay Item No. 210 -C: Flexible Base (complete in place) -Per Cubic Yard.