Water Testing for Contaminants

Water quality issues like Legionella Disease bacteria are on the rise as more people return to the office after the pandemic. CSC can provide water testing for Legionella, Lead, Copper, Total Coliforms including E.coli, and more. We are the leader in complex environmental assessments, testing, and safety consulting.

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.

Resolving Environmental & Worker Safety Compliance Challenges Since 1996

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.

Speak to a Hazardous Material, Worker Health & Facility Safety Management Specialist today: (800) 807-1118


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, and provide services in the following areas:

Health and Safety 

  • Hazardous Building Material Surveys for Asbestos, Lead-based Paint, PCBs and Universal Wastes
  • Biohazard Assessments
  • Indoor Air Quality Assessments for Mold, Fungi and Volatile Organic Compounds
  • Industrial Hygiene
  • OSHA-Compliance Consulting Services


  • Hazardous Materials Abatement Planning
  • Hazardous Materials Abatement Monitoring
  • Post-Abatement Clearance Sampling
  • Remedial Design

Environmental Services 

  • Phase I Environmental Assessment (ASTM E 1527)
  • Phase II Subsurface Sampling (Soil, Soil Vapors, Groundwater)
  • Remedial Investigation of Toxic Substances
  • Remedial Action Project Management, Monitoring and Reporting
  • General Environmental Consulting Services


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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Performance Reviews

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

Compliments to the CSC team from ATC on Genoa Peak Project


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.