Clean Up Creek Bed Lead

Dear Chronicle,
    On a recent walk along West Bull Creek I was amazed to find an incredible amount of lead from the old shooting range that used to be located just west of 360 and north of 2222. I remember the range from when I first moved here in '79. The recent rain storm of September (Hermine) has scoured hundreds of pounds of lead from the meager top soil that used to be on the north side of the creek and dumped it into the bed of the creek. I first noticed a large amount of lead here in '08. I had heard previously during one of the city's Environmental Board meetings that a lead removal remediation had been done at the site sometime previously as a condition of the city allowing the hilltops of the "Champion Tract" to be developed. There was a large amount of lead visible there in '08, but nothing like what I've observed there on my most recent visit (Jan. 2). The concern is that Bull Creek dumps into Lake Austin just upstream from where the intake for our drinking water is located. I've noticed in our annual water quality report that there is a lead presence in our water supply. I'm wondering how much naturally occurring lead there is in the Colorado River watershed upstream from us? I'm no geologist, but my feeling is that the answer is none. This site was supposedly cleaned up already. I would like to see the site cleaned up again as best possible, although understandably all of the lead can never be fully removed from such a large site. At least it should be removed from the creek bed and overhanging limestone ledges where it remains perched waiting for the next rain storm to push it off into the bed of the creek.