A major California water district was relocating underground valves on the main feed line to above ground locations in compliance with new regulatory requirements.  The underground valves were secured within vaults that ranged from just below grade up to 30 feet below ground surface.  These vaults were located on freeways, streets along business and industrial corridors, public and private right-of-ways, parks, golf courses, and backyards and street in residential neighborhoods.  The old valves were constructed of lead and the associated gaskets were presumed to be asbestos containing material (“PACM”). 

CSC performed abatement oversight and final clearance during the removal of the underground lead valves and PACM gaskets.  For this project, services provided by CSC included:

  • Attendance at Pre-bid Meetings
  • Attendance at Pre-construction Meetings
  • Initial Review of Contractors Submittals
  • Performing Abatement Oversight, Air Monitoring and Regulatory Compliance
  • Providing Suggestions for Redesign of Abatement Methods Being Employed
  • Performing Final Visual Inspection Following Abatement
  • Collecting Clearance Samples Following the Abatement
  • Generating Clearance Reports and Close Out Documents for Each Project Phase

The initial project approach called for this work to be performed under standard containment protocols. However, the location of the hazardous materials below ground made this approach impractical.  After reviewing the work plan for abatement activities and evaluating the air sample results for the initial locations, CSC provided suggestions leading to the redesign of the abatement approach to include the following elements:

  • Set up of a mini-containment enclosure adjacent to the work area
  • Placement of drop cloths on the floor of the vault beneath the valve
  • Upon removal of suspect materials , immediate bagging or wrapping
  • Use of a hoist to remove the valve from the vault
  • Perform PACM gasket abatement using a glove bag within the mini-containment enclosure

By employing this approach not only did the number of locations that could be serviced during each work shift increase, significant cost-savings were realized.  Final clearance reports and close out documents were generated and delivered within approximately one week after completion of each phase of the Program.

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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