Biohazard Survey: Disease Outbreak

A case of Legionnaire’s Disease and an increase in the number of pneumonia cases among inmates, medical staff and guards was reported at a state prison facility. CSC conducted a biohazard survey as a member of the incident response team.

Wildfire Smoke Inspections and Source Evaluations

CSC’s experienced team of industrial hygienists has performed thousands of inspections related to wildfire smoke damage claims for many insurance companies.

Technical Support to Resolve Hazardous Materials

CSC completed a hazardous material assessment, developed technical specifications, and  provided remediation oversight on the 40 acre site of former UTC plant in Canoga Park.

Meeting Environmental Challenges

For over 20 years, Clark Seif Clark’s highly qualified team has been providing a broad range of environmental compliance services to meet complex environmental and safety issues, focusing on environmental assessments, investigations, remediation work plans and field oversight for private and public sector clients.


CSC provides a full range of integrated services from conceptual design through field implementation to major environmental restoration contractors and public agencies. Since the late 1980s, public-, industrial- and private-sector clients have relied on CSC to develop, maintain, improve, and amend internal environmental policies as rules, regulations and environmental best management practices changed. CSC is capable of conducting rigorous compliance audits using the same protocols that would be employed by regulatory officials.


Our team of environmental professionals has expertise, certifications and licenses in various technical, scientific, industrial hygiene and environmental engineering specialties:

  • Hazardous Materials Management and Regulatory Compliance
  • Field Inspections, Hazardous Materials Surveys and Compliance Audits
  • Hazardous Waste and Contaminated Soil Profiling and Disposal Recommendations
  • Asbestos, Lead and Mold Abatement Consulting and Removal Oversight
  • Soil, Soil Vapor and Groundwater Assessments, Investigations and Remedial Investigations
  • Indoor Environmental Quality Monitoring and Sampling
  • Site-Specific Chemical Health & Safety Planning and Oversight
  • Environmental Engineering and Implementation of Remedial Work Plans
  • Industrial Storm Water Permitting and Monitoring
  • National Pollution Discharge Elimination System (“NPDES”) Permitting and Monitoring
  • Industrial Hygiene
  • Environmental Engineering
  • Energy Efficiency Evaluations and Strategies


Our experienced environmental remediation management specialists and partners help our clients manage complex challenges in the following states:

  • Arizona
  • California
  • Colorado
  • Delaware
  • Florida
  • Georgia
  • Hawaii
  • Illinois
  • Kentucky
  • Louisiana
  • Michigan
  • Missouri
  • North Carolina
  • New Jersey
  • New Mexico
  • Nevada
  • New York
  • Oregon
  • Pennsylvania
  • Texas
  • Wisconsin


CSC delivers integrated, sustainable solutions for land management reuse planning and environmental project management. Dedicated to making a difference, staff focuses on client needs, builds strong stakeholder relationships and produces project outcomes that often exceed client expectations.

Remediation Oversight of a Nine-Acre Contaminated Site

CSC was selected to oversee and certify that all remediation work was completed in accordance with the Remedial Action Workplan approved by the California Department of Toxic Substances Control for a nine-acre site.

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Chlorinated Solvents and Perchlorate Groundwater Treatment System

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.

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Asbestos and Lead Survey and Abatement Oversight

CSC conducted an assessment that identified asbestos and lead-containing building materials in an abandoned structure for a public agency. CSC also conducted abatement oversight and provided final clearance services following the removal of the ACM and lead-based paint building materials.

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IAQ Assessment for Mold, Asbestos, Smoke and Other Fire related-Contamination

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.

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Client Testimonials

We strive to meet and exceed our client expectations at Clark Seif Clark

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.


It is not often that our busy schedules all us to give recognition for exceptional work.
However, I feel it is necessary to note the outstanding efforts of Derrick Denis while assigned to the indoor quality project at the production facility where we film our television series, “Charmed”. Derrick went well beyond his required job duty to insure that difficult time compressed deadlines were met. His tireless dedication and quality of work on the job were exemplary. Due in large part to Derrick’s efforts, we were able to control on extremely volatile situation which, left alone, would have resulted in a significant financial loss to our organization. We at Spelling are looking forward to a long-term working relationship with Derrick on a wide array of projects. It has been my distinct pleasure to work with Derrick over the past few weeks.


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