Subsurface Investigations. Superlative Work.

Conducting intensive contaminant investigations—something our talented teams do daily—is hard work. Now picture that same work in a busy, industrial section of downtown Los Angeles with narrow streets that can barely fit the necessary drill rigs. Factor in multiple utilities and a highly-pressurized gas line to contend with. Pepper in some extra maneuvering to ensure that all the property tenants’ businesses are as minimally impacted as possible. And add the challenges of helping the property stakeholders understand the application of the Department of Toxic Substances Control (DTSC) consent order that prompted the project in the first place. That’s what our Apex team is impressively addressing as they finish conducting an investigation of a former metal plating site riddled with tetrachloroethene (PCE) from decades of degreasing operations.

Our team’s investigation—across the site’s former plating areas, a wastewater treatment system, metal coating operations, chemical storage areas, linear floor drains, and a soak cleaner pit—assesses the extent of volatile organic compounds (VOCs) in the soil gas and groundwater beneath the site, and as necessary, in the public right-away. This includes drilling up to seven borings, collecting soil samples, installing groundwater monitoring wells, installing multi-depth soil gas probes, and collecting soil gas and groundwater samples. Our team has recommended soil vapor extraction (SVE) as the remedial approach and we will be proceeding with that as another adjunct project stemming from this one. SVE, an approach our team is adept at using, involves drilling extraction wells into contaminated soil and connecting a blower or vacuum pump to pull the vapors through the soil and up the well to the ground surface for treatment. Apex will be installing as many as four additional SVE wells to capture VOC contamination in soil more than 160 feet deep.

We’re proud to do our part. Just one more way we’re helping to make a difference in our communities.

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