The way it appears to me is 3 percent immediately going back to August 2015 retro applied to all wages and ot since then. Year 1. Then 2.5 percent raise in 2 months August 2016. Year 2. Then 2.5 in August 2017. Year 3. Final year raise applied August 2018 until expiration of contract in August 2019. Year 4.
That's 10.5 percent over 4 years with compounding! It comes out to something around 11 percent actual.
Take tta/field tech rate in nyc. Now 42.73 to 44.01 to 45.11 to 46.24 to 47.39 final year. That's 10.9 percent with compounding.