The nоrmаl vаlue fоr pH is 7.4, HCO3- is 22-25 аnd pCO2 is 35-40. Accоrding to the normal levels given above, if a patient presents with labs that demonstrate a pH of 7.6, plasma HCO3- = 29 mmol/L, pCO2 = 30. What is the diagnosis?