Soil Vapor Extraction (SVE)
STATUS AS OF 6/1/2021 - FULLY FUNCTIONAL AND OPERATING
Soil vapor extraction, or “SVE,” extracts (removes) contaminant vapors from below ground for treatment above ground. Vapors are the gases that form when chemicals evaporate. SVE extracts vapors from the soil above the water table by applying a vacuum to pull the vapors out. The air is then filtered through a series of filtration tanks before being discharged. Discharged air meets all applicable air quality standards.
Since full scale start up in September of 2015, the SVE has extracted over 44,000 pounds of VOCs. It is currently estimated to be extracting approximately 200 pounds per month. Monitoring has indicated an overall decrease in TCE concentrations at all soil vapor depths.
Water Treatment System (WTS)
STATUS AS OF 6/1/2021 - UNDER CONSTRUCTION (see each phase for details)
Phase I - Water Treatment System
The Water Treatment System is complete. Because the Phase 3 infrastructure is still in the process of being permitted and constructed, the treatment system is not operating at this time. As of 6/1/2021, this system is complete and ready for operation once the other phases are complete.
Phase II - Conveyance Pipeline (complete)
Construction is complete. The sub-grade, 8-inch diameter pipe has been installed from the Groundwater Treatment System (on the landfill property) to the injection well located on City of Phoenix property at 4050 Sleepy Ranch Road.
Phase III - Injection Well (under construction)
There are three sub-phases to Phase III
Phase III, Sub-phase A (complete) is the well itself. The well has been drilled and developed to a depth of 1,600 feet below surface level. Once the entire system is complete, clean water will be injected into the groundwater at a depth of greater than 1,000 feet below surface level. The pump will be submerged in the well approximately 1,000 feet below the surface.
Construction of the well itself is complete.
Phase III, Sub-phase B (under construction) is the well security and screening. Neighbors around the 4050 E Sleepy Ranch Road well site have worked with the County to ensure a decorative wall and landscaping. Site components will be kept below the wall height. The injection pump will be a submergible pump installed some 1,000 feet below the surface. (Note: picture is a rendering only and is not intended to show detailed features.)
Construction of the wall is complete and planting of trees and shrubs on three sides is complete. The last of the landscaping will be restored once the final utility work has also been completed.
Phase III, Sub-phase C (in permitting / contracting) is the equipment necessary for the injection process. It includes a submergible pump, an electrical vault, a partially underground tank, and piping. Some components must be custom designed and built to keep the equipment profile below the screening wall height.
The design phase of the equipment for injection is complete and vendors are being selected. Work is expected to begin in June or July of 2021. (Note: Larger picture is available in the images folder.)