The following is the link to the study:
http://www.rideuta.com/uploads/Final...y_9Oct2013.pdf
Hatman is correct about the study costs.
I was incorrect about the percentage of increased ridership as it estimated about 34,000 daily riders with double tracking and increased frequency which would reduce overall travel time.
That would be leaving the costs as they currently are.
There is another study that might be included in the link above that discusses the effect of reducing fares for all of UTA.
It basically states that there would be a 50% increase in ridership with free fares. It also stated that there would be a 100% increase with just increased frequency and service.
My thoughts are that we do a bit of both, lower fares by 50% or so and ridership would go up about 40%, increased frequency and service as well as lowering fares 50% and transit ridership would increase an estimated 145%
The above is possible with the expansion of the sales tax to a full 1% in the UTA districts.
The bottom of the report has estimated costs for the various projects as well as some estimated ridership numbers.
Even without the tax, UTA has committed to the goal of doubling transit ridership in the next 6 years from what it was at the end of 2013.