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

Supplement section 9-03.9(2) with the following:

Crushed Surfacing Choker Course
Crushed Surfacing Choker Course shall be manufactured from ledge rock, talus, or gravel in accordance with the provisions of Section 3-01. Recycled concrete is not permitted. The materials shall be uniform in quality and substantially free from wood, roots, bark, and other extraneous material and shall meet the following quality test requirements:

Los Angeles Wear, 500 Rev	30% maximum
Degradation Factor	30 minimum
Minimum Void Content:	30% as determined by AASHTO T19 or ASTM C29, rodding procedure.

The grading and quality requirements are:

Sieve Size	Percent Passing	
1-1/2 inch	100	
1 inch	95-100	
½ inch	25-60	
#4	0-10	
#8	0-5	
% Fracture	95	
All percentages are by weight.

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.