MTO Special Provision 110S12 and LS 609 Petrographic Assessment: Requirement of 95% Category 1 aggregates retained on the 4.75 mm sieve according to Table B of LS-609. 

OSSGA Position:  It is apparent the 95% minimum requirement in Table 5 will not work, based on real situations experienced in 2015, and will most likely lead to unnecessary claims on MTO contracts. As a result, OSSGA has asked the MTO to review the requirement for 95%.