Patent ID: 7975851

Claim:
A soil remediation apparatus comprising: (a) a trommel screen having an inlet and an outlet, the trommel screen having a surface that has a plurality of perforations; (b) a trommel screen housing comprising: a trough in which the trommel screen is mounted with its inlet inclined upwards; a front cover mounted at the front of the trough, the front cover at least partially covering the trommel screen inlet and having an impacted soil inlet in communication with the trommel screen inlet; a rear cover mounted at the rear of the trough, the rear cover at least partially covering the trommel screen outlet and having a vapor discharge outlet near the top of the trommel screen and a treated soil outlet in communication with the trommel screen outlet, a vapor cover frame at least partially removably mounted to the trough and a flexible vapor cover removably mounted over the frame and covering the trough, the flexible vapor cover being made of a flexible material such that it can be draped over the vapor cover frame and conform to the overall shape of the portion of the cover frame covered by the flexible vapor cover; and (c) air extraction means fluidly coupled to the vapor discharge outlet and operable to extract contaminant vapors volatilized by the trommel screen during soil aeration from the housing and to contaminant remediation means, wherein the front cover, rear cover, flexible vapor cover, and air extraction means together serve to prevent at least some volatilized vapors from escaping from the housing into atmosphere.