§ A168-11. Foundation course.

A. 

The foundation course shall consist of select granular subgrade (§ A168-23A) (NYSDOT Item 203.20) to a minimum thickness of six inches, with a top of 12 inches of subbase material (§ A168-23A) (NYSDOT Item 304.12) as approved by the Commissioner of Public Works. It shall contain stones no larger than four inches in thickness and be well-graded from coarse to fine. The material shall be placed on the prepared subgrade in two layers, and each layer shall be thoroughly compacted by rolling with a vibratory roller or other equivalent compaction equipment to a minimum of 95% of the maximum dry density, as determined by the Modified Proctor Test (ASTMD1557). After compaction, the foundation course shall be fine graded to an elevation allowing for the six inches of wearing course and approved by the Commissioner of Public Works. A minimum of three months shall be allowed for the street to settle and compact before pavement shall be constructed, or as ordered and approved by the Town Engineer or the Commissioner of Public Works. Stakes with final line and grade shall be maintained by the developer at all times to check the foundation course as well as pavement. The inclusion of the six-inch thick layer of select granular subgrade shall not be required if the Engineer can demonstrate that either the undisturbed, firm, natural subgrade solid or embankment fill meets the requirements given in § A168-23A.

B. 

Testing and certification.

(1) 

The materials to be used for the subgrade and subbase courses shall be tested in the laboratory for compliance with material specifications given for each material in the NYS DOT Standard Specification items given in Subsection A of this section of the street specifications.

(2) 

The compaction of each lift of material in the foundation course shall be verified by in-place density tests performed by utilizing the in-place Nuclear Method and/or the in-place Sand Cone Method, as specified by ASTM. Tests shall be performed at no less than one test per lift per 100 feet of roadway alignment.

(3) 

At the conclusion of construction, a licensed professional engineer shall certify that all roadway foundation courses have been placed and compacted under his/her supervision to a condition suitable for supporting this overlying pavement. This certification shall be provided in writing to the Town Commissioner of Public Works and the Town Engineer, whether the testing is performed by the Town Engineer or, where contractually required, performed by the developer's engineer.

Amended 6-23-1988 by L.L. No. 1-1988; 3-24-2005 by L.L. No. 1-2005