During the second quarter we continued to execute on the three-year vision we laid out for Alta Mesa at the time of the business combination. Best forex strategy 20110 eight rigs running and plans to add a ninth rig shortly, we continue to deliver industry leading production growth. 04 per basic and diluted share. 4 million for the second quarter of 2018.
Total production for the second quarter of 2018 was 2,334 MBOE, an average of 25,600 BOE per day. Production in the second quarter was impacted by offset well shut-ins for fracture stimulation effectiveness. In light of production to date and the forward outlook for the drilling and completions schedule, the Company now expects 2018 exit production of 38,000 to 40,000 BOE per day and average production of 29,000 to 31,000 BOE per day for full year 2018. Estimated system gas volumes for July of 2018 averaged 112 MMcf per day compared to 82 MMcf per day in February.
The Kingfisher 200 MMcf per day plant expansion was placed into service in April, increasing operated inlet capacity to 260 MMcf per day. To further expand the Kingfisher Midstream platform, the Company has begun the process of transferring the produced water business from Alta Mesa Upstream to Kingfisher Midstream. Alta Mesa Upstream designed a system that is readily expandable and is purpose-built for the ramp-up of produced water volumes from Alta Mesa Upstream and other third-party customers. While Kingfisher Midstream has seen steady increases in system gas volumes, due to the timing of when Alta Mesa production and third party activity levels are expected to increase, Kingfisher Midstream no longer expects to achieve previously provided EBITDA guidance.