11831 AIRPORT RD WHOLE SITE FILE 2020-01-21

2-03.5 Payment This Section is supplemented with the following: Measurement for roadway excavation and embankment will be based on the original ground elevations recorded previous to the award of this contract. Contractor shall notify the engineer immediately if discrepancies are discovered in the ground elevations which will materially affect the quantities of earthwork. If, in the determination of the engineer, significant discrepancies are revealed, the original computations of earthwork quantities will be adjusted accordingly. Earthwork quantities have been computed, either manually or by means of electronic data processing equipment, by use of the average end area method or by the finite element analysis method utilizing digital terrain modeling techniques. 2-06 SUBGRADE PREPARATION 2-06.3 Construction Requirements Add the following new section: 2-06.3(3) Subgrade for Permeable Pavements (March 9, 2016 APWA GSP) Before placing permeable ballast for Porous HMA/WMA, the Contractor shall bring the Subgrade to the required line, grade, and cross-section. The Contractor shall compact the Subgrade to a depth of 6 inches to at least 90 percent, but not more than 92 percent, of the maximum density as determined by the compaction control tests described in Section 2- 03.3(14)D. Two (2) density tests will be conducted for every 5,000 square feet of prepared subgrade; or four(4)tests per 200 lineal feet of roadway or sidewalk. All subgrade shall be firm and unyielding as determined by the Engineer. The Contractor shall take measures to protect the prepared and approved subgrade from traffic, water run-on, standing water, or other damage. Subgrade that has been over compacted, shall be scarified to a minimum depth of eight(8) inches and recompacted. Material used to protect the Subgrade from traffic or provide access to adjacent facilities shall be removed and the subgrade compacted prior to placing geotextile, if used and/or permeable ballast. 2-06A Measurement and Payment (March 9, 2016 APWA GSP) Supplement this section with the following: Measurement for Subgrade for Permeable Pavement will be in accordance with 2-06.5. Swift Green Line—Corridor Stations Special Provisions SP72 May 2017