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Engineering/Hydro-Geologist, Christopher Watt, CEG, CHG, to Present at Upcoming Conference on Soil, Water, Energy, and Air

(Ukiah, CA – March 7, 2012) - LACO's Director of GeoEnvironmental Services and Ukiah Regional Director, Christopher Watt, CEG, CHG, will be presenting at the 22nd Annual International Conference on Soil, Water, Energy, and Air. The conference is presented by the Association for Environmental Health and Sciences (AEHS) Foundation, and will be held March 19-22, 2012 in San Diego, CA.

As an engineering/hydro-geologist, Mr. Watt navigates the regulatory process for institutions, municipalities, and small business to cost effectively resolve their environmental liabilities.  As a principal at LACO, he continues a legacy of bringing underground storage tank (UST) sites to closure using traditional and innovative remediation methods.  Over the last 20 years, LACO has negotiated the closure of over 160 UST cases in California.  Mr. Watt currently oversees a $7M portfolio of cleanup projects located in Northern California.

Mr. Watt's abstract for his upcoming presentation titled, A 10-year MTBE Barrier System, is below:

In 2001, a 600-foot long MtBE plume originating from a fuel station had been discovered to discharge at a spring feeding a fish-bearing stream.  A barrier type sparging system was installed up-gradient of the spring and over the last 10 years has prevented MtBE from entering surface waters.

The barrier system originated as fixed-panel system injecting ozone through eight micro-porous sparge points.  Once a source zone system was installed and MtBE plume attenuation was documented, the fixed system was removed and a mobile system was used to inject ozone on a pre-determined schedule. 

Ozone demand was based on mass discharge of MtBE (velocity x concentration) through the treatment zone.  Groundwater velocity was calculated using bore-hole dilution tests. In summary, the sparge points operated reliably for the 10 year period of operation in which ~90 kgs of ozone were injected over an equivalent of ~1,500 days of operation.