How much calcium is in the river in parts per million?

You take a 1 L sample of water from a river. You place 5.0 mL of river water into a beaker and dilute it to 25.0 mL with distilled water. You add NaOH and hydroxynaphthol blue indicator and then titrate with 0.0033M EDTA. It takes 8.56mL to reach the end point. How much calcium is in the river in parts per million? What is the molar Calacium concentration of the river?