REMEDIATION TECHNOLOGY EVALUATION

Prior to the application of a Chemviron system, one or more members of the
Chemviron team makes a site specific evaluation. All are experienced and
knowledgeable in their fields and able to make informed decisions, which
will lead to the best possible operational strategy to remove vapor and liquid
phase contaminants.

In the process of applying the Chemviron system, observations and evaluations
are continually being made, and adjustments to the system are instituted
where necessary to optimize its operation. Real-time sampling of operational
parameters is accomplished with the help of a proprietary device that yields
extremely accurate readings of flow rates, data concerning levels of VOC
concentration and recovery data. Data is collected at the extraction point, as
well as at surrounding observation points to determine the radius of the
system's influence. Taken together, all of the information is used in
calculations that accurately access the mass of contaminant removed in vapor
and liquid phases.

Recovered vapors are discharged to the atmosphere after first being treated
with vapor phase carbon where required. Recovered liquids, on the other hand,
are either containerized for later off-site disposal, or they can be treated
within the Chemviron trailers using a state-approved petroleum contaminated
ground water treatment system.

These remedial events are performed at a site on a periodic basis. This promotes
natural attenuation, which is enhanced after each episode of vapor or liquid
phase removal. The frequency and duration of subsequent events is
determined after careful review of site conditions and the requirements of
clients and regulatory agencies. Thus, some sites receive treatment one day
per month, while others undergo treatment for a week or more. The systems
can be fully automated to run unattended, 24 hours a day. Automated units
are equipped with limit switches on level controls, separator pumps and vacuum
systems for automatic shutoff in the event of overload conditions and prevent
spillage.


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