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Spring <br />Marsh <br />^ Earth dike <br />° Oil well <br />? Gas plant <br />Stream <br />Dry connection <br />= Road <br />=== Trai I <br /> <br />f' <br />° <br />Legg C ' <br />Diamond-y <br />° <br />Gomez ? <br />Plant <br />12 <br />Cow Pond <br />Texas <br />A IB <br />0 <br />e0? N <br />f <br />? o <br />ant ao <br />ell <br />15kms <br />Fo <br />18kms rt <br />Stockton <br />Leon Springs <br />0 500m Ikm <br />Fig. 2 Map of the two segments of Leon Creek. The upper <br />segment is surrounded by an oil (shallow) and gas (deep) <br />field. Other wells more than 100 meters from the creek <br />occur throughout the area, and various pipelines form a <br />complex network. Each well has an access road. <br />a series of seeps. Kennedy (1977) reported that at times Leon Creek was <br />dry upstream from its confluence with the Diamond-Y Spring Run. The com- <br />bined flow usually extends another kilometer NE and sinks into the soil. <br />This upper segment was extensively studied by Kennedy (1977). The stream <br />bed is often dry for the next 2 kilometers. Near a Monsanto Gas Company <br />(= Monsanto Well) installation the stream bed again has water, much of it <br />from springs in the bottom of a large pool 1.5 meters deep. Additional water <br />comes from a series of springs on the south bank. The stream flows about <br />500 meters through a marsh and is then joined by the flow from another <br />large south bank spring. From there it flows about a kilometer to the <br />I