11. There are currently about 100 injection wells in the city administration offices and housing complexes. 12. The 36 workers aboard the platform pumped heavy drilling mud into the leaking injection well . 13. Critics of waste water injection wells cite concerns relating to the injectate polluting receiving waters. 14. Artificial recharge of floodwater using injection wells was first developed in the Federal District around 1953. 15. The development project includes 34 production wells, 30 water injection wells and three gas injection wells . 16. Water injection began in 1953 using water from Lakota wells, with 38 injection wells by 1958. 17. EPA regulations define six classes of injection wells . 18. The earthquake occurred near two hydraulic fracturing wastewater injection wells that are reportedly close to capacity. 19. Forty gas injection wells tap into the reservoir. 20. Also, Layne is able to drill deep injection wells to facilitate the disposal of treated wastewater.
