Whether it is 30 days from date of receipt or date of application, do not take it seriously, as 30 days time from date of receipt + postal transit of 5 days. You can also seek same information from BC corporation also . If you fail to receive response or if information is deneid with such exemption under Sec.8, under sub section 1, within 30 days from date of such PIO response or no response you have to go to first appeal to an officer, superior to Public Information officer.
Read Sec.19 in RTI Act in your mother tongue. There are just 10 relevant sections in RTI Act and downloading the same comes to one side of A4 Page. Down load 2h, 5,6,7,10,18, 19, and 20 sections and keep a print of one side A4 in your mother tongue. Or purchase the book for Rs.60/- or get it free from any local voluntary organization.