Jim Steinberg, Staff Writer
Posted: 01/31/2012 12:33:41 PM PST

HINKLEY – The northern boundaries of that plume of contaminated groundwater continues to advance.

Water samples from new test wells – many installed this past summer – show chromium 6 contamination, above background level, extending north of Mountain General Road for the first time.

It is not clear, however, if the plume is growing at a rapid pace, or if the plume has been larger than originally thought for some time.

The thought behind some of the new well placements was to get ahead of the plume and then work backward to map its location.

It now appears the drilling may not have extended far enough north to get ahead of the plume.

The results of new samples from test wells were released Tuesday.

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