Duluth UDC § 912.03

The following types of base materials may be used: 1. Asphalt Streets: a. Crushed Stone Base i. The base course shall consist of at least 8 inches of compacted and graded aggregate base. After being thoroughly compacted and brought to proper section, 4 inches of 19 mm Superpave binder course shall be applied. Industrial uses may require a thicker GAB layer as directed by the City. ii. If a delay in paving is reasonably expected by the Developer or the Department, the base shall be primed with 0.25 gallon of R.C. 70 per square yard the same day it is compacted and cured for 7 days prior to paving. iii. The final 2 inches of 9.5 mm Superpave surface course shall be applied after 90% of the buildings on the street have been built, or prior to the end of the maintenance period (but after the 11th month), whichever occurs first. iv. Prior to applying surface course, a tack coat shall be applied to the binder course at a rate of no less than 0.05 gallons per square yard. Type of tack shall be approved by the Planning and Development Department prior to placement. b. Soil Cement Base. i. If the base material (residential soil) is unsatisfactory to the Planning and Development Department then a soil cement mix design with engineering test results acceptable to the Department. The design must come from a geo-technical firm with the results certified by a Professional Engineer registered in the State of Georgia. The tests required for the design are ASTM D558 or AASHTO T134 or ASTM D559 and/or 560 or AASHTO T135 and 136. ii. The minimum base course shall consist of at least 8 inches of suitable soil (high mica content not suitable) stabilized with 10% of Portland Cement by volume (approximately 42.3 pounds per sq. yd.). 2. Concrete Streets: Shall be designed by a geotechnician