4-04.2	Gravel Base
(March 9, 2016 APWA GSP)

Revise section 9-03.9(2) to read:

Permeable Ballast
Permeable ballast shall meet the requirements of Section 9-03.9(1) for ballast except for the following special requirements. 

The grading and quality requirements are:

Grading No. 1	Grading No. 2 (AASHTO No. 3)	
Sieve Size	Percent Passing	Sieve Size	Percent Passing	
2-1/2”	99-100	2-1/2”	100	
2”	65-100	2”	90-100	
¾”	40-80	1-½”	35-70	
No. 4	0-5	1”	0-15	
No. 100	0-2	½”	0-5	
% Fracture	95	No. 100	0-3	
All percentages are by weight.	% Fracture	95	

The sand equivalent value and dust ratio requirements do not apply.

Los Angeles Wear, 500 Rev. 	30% maximum
Degradation Factor	30 minimum

The fracture requirement shall be at least two (2) fractured faces and will apply to the combined aggregate retained on the No. 4 sieve in accordance with WSDOT FOP for AASHTO T 335.

The minimum void ratio of the aggregate shall be 30 percent as determined by AASHTO T 19.

Permeable ballast material may be conditionally approved based on Contractor submitted sampled materials prior to delivery to the site. Final Acceptance will be based on conformance testing completed on material that has been delivered, installed, and compacted on site.  The exact point of acceptance will be determined by the Engineer. Material out of conformance with the project specifications will be removed and replaced at the Contractor’s expense.