ADDENDUM No.01/2018 : TENDER FOR PROVISION OF SECURITY SERVICES (SKILLED AND TRAINED ANPOWER) AT STAGE-1 SEVEN METRO STATIONS (KOYAMBEDU, CMBT, ARUMBAKKAM, VADAPALANI, ASHOK NAGAR, EKKATUTHANGAL & ALANDUR) AND STAGE-2B TEN METRO STATIONS (SAIDAPET METRO, NANDANAM, TEYNAMPET, AG-DMS, THOUSAND LIGHTS, LIC, GOVERNMENT ESTATE, HIGH COURT, MANNADI AND WASHERMENPET)