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On June 6, 1994, the Edwards Underground Water DIstrict (EUWD) received a request from Lackland Air Force Base (LAFB) to perform a leak detection I location survey on the main base and annex water distribution systems. A pre-survey conference was held January 19, 1995 at the base to discuss the work to be performed. It was agreed that EUWD would perform sonic leak detection on all available access points and computerized leak location as needed. A final report, including any unusual system condition found and an updated  master water plat would be submitted to LAFB at the conclusion of the survey. It was further agreed that LAFB would provide EUWD with one experienced utility service person and would repair all leaks detected in a timely manner.

Mark L. McGinnis of EUWD began the survey on February 27, 1995, and the survey was concluded on August 8, 1995. Over the course of the survey, EUWD surveyed a total of 2, 114 access points including 903 customer service connections, 441 fire hydrants, 720 valves, and 50 other access points covering 65.34 miles of distribution main.

Mr. McGinnis detected a total of 76 leaks. This total included 34 service valve leaks, 6 main line leaks, 20 fire hydrant leaks, 11 main valve leaks, and 5 customer side leaks. As of August 8, 1995, 14 of the 76 leaks detected over the length of the survey have been repaired.

EUWD estimates I I ,291 gallons of water per day has been saved by the repairs to date. The leaks discovered during the survey range from 7,200 gallons per day to numerous small service valve leaks.

As part of the survey, EUWD located 401 valves of various types, 15 fire hydrants, 24 service connections, and 2 back flow preventors not shown on the master water plats. EUWD surveyors were unable to locate I 7 I valves of various types, 36 yard hydrants, and 13 tire hydrants shown on the master water plats. An additional 5 items were discovered to need some type of repair or adjustment. EUWD was unable to properly survey areas on 28 plats due to various reasons.