CSC performed an Indoor air quality inspection of mold, ACM, smoke and other related contamination of a 110-room hotel property located in Southern California to determine the presence or absence and concentration of particulates including soot, char, ash, asbestos-containing materials and combustion by-products related to a fire that occurred in one of the hotel rooms.

The main objective of the investigation was to determine the presence or absence of contaminants potentially emitted during the fire in one of the second floor rooms. Chemicals of concern included:

  • Smoke particulates (e.g., soot, char, ash and metal fume)
  • Polyaromatic hydrocarbons (PAHs)
  • Polychlorinated biphenyls (PCBs)

Other related contaminants investigated included asbestos debris from asbestos containing building materials potentially spread by various activities before, during and post the fire within the hotel and, if present, attempt to quantify the concentration of particle deposits.

Finally, through visual observation and limited bulk and tape lift sampling, fungal growth was investigated.

Schedule:  CSC inspected the site within 24-48 hours of receiving the “go-ahead” from the client for both the initial visit and the follow-up visits.   The reports were issued one week after the receipt of the last laboratory data.  Also, the client was informed each day of the status of the job site by telephone communications and follow-up e-mails.

Project Outcomes:  CSC findings were as follows:

  • CSC sampling indicated asbestos contamination all floors of the building. Controlled decontamination will be required for exposed surfaces and contents under controlled conditions. In addition, personnel should not access the building unless they have proper personal protective equipment (i.e. Tyvek® boots/coveralls, shroud and half face piece respirators with HEPA filters).
  • Combustion by-product samples all showed either non-detect or very low surface contamination concentrations for all contaminants. All cleaning requirements should be addressed in the asbestos and mold decontamination and remediation work plans.
  • Visible mold was only observed on the second floor hallway walls. Rooms were not observed to have visible mold growth. The two areas sampled on the second floor confirmed the presence of mold. The vinyl wall covering (used throughout the facility) held moisture resulting in the growth of mold. In addition, CSC observed moisture condensing and running down the walls on much of the second floor hallway that had been smoke-contaminated during the fire. This area would require a controlled remediation.

Based on the visual observations and the results of the laboratory analyses, CSC concluded and submitted the following findings and recommendations:

  • Remediation is necessary to decontaminate and clear the hotel of asbestos fibers released by the fire and to remove mold from damaged wall surfaces in the second floor hallway.
  • A Procedure 5 Plan would be required prior to clean-up any disturbed ACM resulting from damage caused by fire, explosion, or natural disaster – R1403(d)(1)(D)(ii)(I).

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.


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