CESIUM 137-in Japan's Nuclear Reactor and in Our MCL

As the tragic situation with radiation in Japan continues, I see Cesium 137 in the news. Cesium is the radioactive substance which has been released to the atmosphere from the reactors-proving that the containment box has been breached. Cesium 137 comes from the reactor core.
Well, as noted in earlier posts, Cesium 137 is embedded in sediment in Mountain Creek Lake.
No official explanation for its presence has been given.
But research shows missile development by TEMCO (as in Ling-Temco-Vought) occurred at the site prior to or during the Cold War.
Cesium 137 likely was in run-off water, which ran off into the lake, along with a host of fuels and toxic chemicals. Acording to the Texas Wildlife and Fisheries Dept, any contribution of toxic substances by industry or the military was most definitely illegal.
In fact, I can't think of anything that would more violate the spirit of the Clean Water Act than radioactive Cesium.
Could this material be removed from the lake? Probably-but then it would be stirred up to possibly endanger humans and would have to be stored elsewhere.
However, I do have problems with Dallas/Grand Prairie's lake remaining radioactive 300 years and polluted forever... or until flooding forces toxic water into inhabited areas.
What do you think?
Citizens' voices needed!!!