Project:
Aerospace Manufacturing Facility
Bottom Line: Identified data gaps which stopped implementation of a previously planned but ineffective $1M ZVI injection remedy at the site’s former source area. Re-evaluated and selected a more effective remedy.
Summary of Project
The 20-acre site has been used for manufacturing operations since 1967. The current site owner/occupant manufactures control components and systems for industrial applications. One waste management unit contained a concrete UST that received wastewater and spent chromic acid solutions from an anodizing process during the 1960’s and 1970’s. Solutions that were neutralized in the UST were then gravity-fed as effluent to a drain field. After the UST was removed in 1987, an SVE system was installed in December 1988 and operated for 2 years. Previous investigations indicate that soil and groundwater beneath the site is impacted by VOCs including PCE, TCE, and 1,1,1-TCA.
- Prepared bid specifications and provided construction management oversight for well fit-up design to incorporate new groundwater extraction wells into the onsite groundwater treatment system.
- Designed and implemented SVE pilot tests for vadose zone soil remediation of chlorinated VOCs at two waste management units.
- Prepared an SVE design report for the installation of two SVE systems.
- Prepared bid documents and specifications for the installation of two SVE systems consisting of 13 multi‑nested vapor extraction wells and 11 multi-nested vapor monitoring wells and 200-scfm-capacity blowers. Evaluated contractor bids for the construction and installation of the SVE systems.
- Peer-reviewed historical site data for the implementation of a ZVI remedy at a waste management unti and provided recommendations for additional investigation based on identified data gaps. The data gap investigation led to the re-evaluation of source area remedies; this stopped implementation of the previously selected ZVI remedy which would have been ineffective.
- Prepared a design report for an interim measure groundwater remedy consisting of a 100-gpm-capacity onsite groundwater extraction and treatment system and offsite groundwater reinjection system. The remediation system included an air stripper for VOC remediation and an advanced ultraviolet and peroxide oxidation system for 1,4-dioxane treatment. Design for the automated injection system included the use of custom-programmed telemetry software to regulate flow using variable frequency drive pumps, motor‑actuated valves, and pressure transducers.
- Prepared bid documents and specifications and evaluated contractor bids for the installation of 100-gpm-capacity onsite groundwater extraction and treatment system and offsite groundwater reinjection system.
- Prepared a design report for a source area thermal groundwater remedy, as an interim measure, with a remedial objective of less than 1,000 parts per billion of VOCs at a waste management unit. The source area remedial design included the use of angle‑drilled remediation wells to treat VOC-impacted groundwater underneath a manufacturing building.
- Prepared bid documents and specifications and evaluated contractor bids for the installation and operation of a thermal remediation system which included thermal remediation wells drilled into the upper 10 feet of bedrock beneath the waste management unit.