T. M. Gates, Inc

T. M . Gates, Inc.

Environmental and Sanitary Wastewater Consultants

Excavation and Collection

Before the soil and/or groundwater contamination can be disposed or treated, it must first be excavated or treated. Soil excavation is relatively straight forward. The contaminated soil is removed using heavy equipment, characterized, then loaded into trucks for appropriate disposal. Soil disposal is usually only appropriate if the quantity of contaminated soil is small. If soil disposal is not feasible then groundwater collection and/or vapor collection systems can be installed. The following contaminant collection systems have been installed by T. M. Gates, Inc.:

GROUNDWATER COLLECTION WELLS

Groundwater collection wells are effective at sites that have deep groundwater or space limitations. Either pneumatic or electric pumps and control systems can be installed to accommodate specific system requirements. Installation of groundwater collection wells does not require major soil excavation and can be done without disrupting operations at the facility.

GROUNDWATER COLLECTION SUMPS

Groundwater collection sumps are capable of collecting the maximum volume of water per unit area. Collection sumps are usually used in conjunction with french drains or interceptor trenches. Groundwater collection sumps are typically installed at sites with shallow groundwater and in soils with a low hydraulic conductivity.

Horizontal Soil Vapor Extraction (SVE) lines are used to collect contaminated vapor in soil. Horizontal SVE lines provide a large vapor collection area, which increases the systems treatment efficiency. Horizontal SVE lines are usually installed at sites that have shallow soil contamination.

HORIZONTAL SOIL VAPOR EXTRACTION LINES

Vertical Soil Vapor Extraction (SVE) lines are installed at sites with deep soil contamination or at locations with limited access. Proper installation of vertical SVE lines is critical, in order to eliminated the possibility of "short circuiting" to the surface. Vertical SVE lines can either be installed in conjunction with a groundwater collection system, or they can act as a dual phase collection system that collects groundwater and soil vapor.

VERTICAL SOIL VAPOR EXTRACTION LINES