SECTION 5.00 : CONTROL OF WORK Subsection 5.01 : Authority of the Engineer The Engineer shall decide all questions which may arise as to the interpretation of the plans and specifications, and they may alter, adjust and approve same when necessary; all questions which may arise as to the quality, quantity, value and acceptability of materials furnished or to be furnished and work performed or to be performed; all questions which may arise as to the progress of the work and need for and manner of correcting same, and also the need for and terms of delays and suspensions; all questions relating to the need for and terms of extra work; all questions relating to the supervision, control and direction of work on the site and the use thereof; all questions as to the acceptable fulfillment of the Contract on the part of the Contractor. Subsection 5.02 : Plans and Detail Drawings Approved plans, profiles and sections on file in the office of the Department will show the location, details and dimensions of the highway, bridges and other work contemplated, and all work shall be in conformity therewith and with the specifications. Contract drawings, supplemental plans and detail drawings designed by the Department are part of the complete plans. Shop drawings, detail drawings, erection drawings, catalog cuts, temporary structures and other plans designed and or submitted by the Contractor as required in the Specifications shall, upon approval by the Engineer, become part of the complete set of plans. Drawings or plans for which the Contractor is responsible for the design, such as for, but not limited to, steel sheeting; cofferdams; sign, signal and lighting supports; temporary structures; temporary traffic control plans, erection drawings; demolition drawings; and computations submitted by the Contractor for approval shall bear the seal of a Professional Engineer of the appropriate discipline registered in Massachusetts. Approval of shop drawings by the Engineer does not relieve the Contractor of any responsibility under the Contract for conformance to the applicable codes, standards, etc.; nor for errors in dimensions, details or quantities; nor for compliance with the de tails of the original approved design. Structural steel shop drawings shall be prepared and presented in accordance with the AASHTO/NSBA Steel Bridge Collaboration G1.3 Shop Detail Drawings Presentation Guidelines Documentation with Sample Drawings . Structural steel shop drawings shall be reviewed and approved in accordance with the AASHTO/NSBA Steel Bridge Collaboration G1.1 Shop Detail Drawing Review/Approval Guidelines . If there are any conflicts between these guides and the Standard Specifications, the Standard Specifications shall govern. The Contractor shall not receive payment for, nor be allowed to install any item or materials which require shop drawing approval until the shop drawings for that item have been approved by the Engineer. The title block of shop drawings shall include, at a minimum, the following information: fabricator’s name and address; city(ies) or town(s) where the project is located; location(s) where the material is to be used; MassDOT contract number; Federal aid project number, when applicable; MassDOT Project Number; name of the contractor, the subcontractor; date of drawing and date of all Massachusetts Department of Transportation – Highway Division Standard Specifications for Highways and Bridges II.82 202 4 Edition SECTION 400 : SUB- BASE, BASE COURSES, SHOULDERS, PAVEMENTS AND BERMS SUBSECTION 401: GRAVEL SUB -BASE DESCRIPTION
401.20 : General
The gravel sub -base shall consist of approved gravel placed on the subgrade and in close conformity with the lines and grades shown on the plans or established by the Engineer. MATERIALS
401.40 : General
Materials shall meet the requirements specified in the following Subsections of Division III, Materials: Gravel Borrow ............................................................................................................................... M1.03.0, (Type a or b ) Processed Gravel .......................................................................................................................... M1.03.1 CONSTRUCTION METHODS
401.60 : Gravel Sub -base
The gravel shall be spread and compacted in layers not exceeding 8 in . in depth, compacted measurement, except the last layer of gravel Sub -base course (conforming to M1.03.0: Gravel Borrow Type a or b, or M1.03.1: Processed Gravel for Subbase) will be 4 in . in depth compacted measurement and all layers shall be compacted to not less than 95 % of the maximum dry density of the material as determined by AASHTO T 99 Method C at optimum moisture content as determined by the Engineer. If the material retained on the #4 sieves is 50% or more of the total sample t his test shall not apply and the material shall be compacted to the satisfaction of the Engineer. The specific density of the Gravel Sub -base shall be maintained by determining the number of passes of a roller required to produce a constant and uniform density, after conducting a series of tests either using the sand/volume or the nuclear device. Any stone with a dimension greater than that permitted for the type of gravel specified shall be removed from the sub -base before the gravel is compacted. Compaction shall continue until the surface is even and true to the proposed lines and grades within a tolerance of ⅜ in. above or below the required cross -sectional elevations and to a maximum irregularity not exceeding ⅜ in. under a 10-ft line longitudinally. In locations when the 8 in. of gravel is used as a base for Item 405 this tolerance shall be ¾ in. under a 10- ft line. Any specific area of gravel sub- base which, after being rolled, does not form a satisfactory, solid, stable foundation shall be removed, replaced and recompacted by the Contractor without extra compensation. The gravel foundation for cement concrete surfacing shall be conditioned in accordance with the provisions of 476.61: Preparation of Grade . Massachusetts Department of Transportation – Highway Division Standard Specifications for Highways and Bridges II.83 202 4 Edition COMPENSATION 401.80: Method of Measurement Gravel for sub -base shall be measured as specified in 150.80: Method of Measurement. 401.81: Basis of Payment Gravel for the sub -base will be paid for at the contract unit price per cubic yard for Gravel Borrow. Payment for shaping and compacting of the sub -base as specified herein shall be included in the item of Gravel Borrow. SUB