The following procedure was done to determine the hardness of a water sample taken from a stream. A 10 mL buffer was added to 15.0 mL of the water sample to increase the pH to 10. The sample was then titrated with 27.30 mL 0.0125 M EDTA to the end point. Calculate the water hardness in ppm CaCO3. [Given CaCO3 = 100 g/mol]