Cleanup was accomplished in a relatively short time frame by focusing the remediation strategy on hot spots and high-rate removal tactics to minimize plume spreading.

The chlorinated solvents, perchloroethylene (PCE), trichloroethylene (TCE), and hexavalent chromium (chrome 6) from the facility’s plating line were released to shallow groundwater beneath the process building.  Additional chlorinated solvents from an unknown source were also detected in groundwater below the product test stands and the chemical storage area.  Sampling determined that, in addition to the highly contaminated soil in the two production areas, two aquifers underlying the 22-acre site had been impacted by PCE and TCE at levels up to 120,000 parts per billion.

Localized hexavalent chromium contamination was addressed by chemically precipitating the chromium from extracted groundwater in an aboveground batch treatment system.  Chromium levels were reduced below the maximum contaminant level for drinking water and the batch treatment for chromium was been discontinued.

Remediation of the chlorinated solvents involved installation of groundwater extraction wells that are currently capturing contaminated groundwater from beneath the 22-acre site and pumping it to a centrally located treatment system consisting of an air stripper, liquid-phase carbon beds and vapor-phase carbon beds. Thirteen dual-phase extraction wells and seven air sparging points operate in conjunction with the pump-and-treat groundwater system to address the two areas of highest contamination.

The Santa Ana Regional Water Quality Control Board was the oversight agency for this project.  Staff involvement and on-going management of the remediation program facilitated a third party sale of most of the property.

We have been more than pleased with the service provided by Clark Seif Clark Environmental. This is our second contract with them and their professionalism is top notch. I can only hope they are the successful bidder on our next contract as well.

Jim B.
Chief of Plant Operations II

Just want to say Thank You.
Your lunch presentation was nothing less than awesome. Your professionalism, enthusiasm, and knowledge energized the class. We look forward to a continued relationship with you and your organization. Thanks again,


I just wanted to take a moment to say Thank You for on excellent presentation on Saturday.
My technicians and I were all very impressed by what we learned, and I received some very positive feedback from the other offices in attendance. Being in the water damage business, we are frequently faced questions about mold growth from water damage customers, insurance personnel and property managers. Your presentation, visual aids and handouts were well planned and targeted to our particular interests. I think we can now address the topic with a greater sense of confidence (and a little less guesswork!). I am sending copies of your presentation packet to everyone who attended along with request for feedback. Thank you again for a well done presentation. I look forward to working with you on future projects.


Wanted to take a few minutes to express our "thanks" for the wonderful presentation that Derrick Denis gave at our office meeting last month.
We had over twenty agents in attendance and they were all very impressed with no only the knowledge, but the informative way Derrick presented the material. The Mold Disclosure Issue is one of the most confusing that we as real estate practitioners have had to deal with in a number of years. Derrick made the confusion somewhat less on our part and gave us all a better understanding if just how we should present this problem to our clients. Again, thank you for having such a wonderful person representing your company. We would not hesitate to use or recommend your firm to our clients.


Thank you again for being part of the Los Angeles County East Chapter (LACE) luncheon program last week.
We greatly appreciated your understanding of our audience and what they needed to know. Both your presentation and responses to the participants questions were right on target.


COVID-19: Assisting Clients with Strategies for the New Realities