COMPLIANCE INFO_2023 ARCADIS REPORT

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Additional Housekeeping Requirements: Arcadis prohibits dry sweeping or dry brushing where such activity could contribute to employee exposure to respirable crystalline silica unless wet sweeping, HEPA-filtered vacuuming or other methods that minimize the likelihood of exposure are not feasible. Arcadis prohibits use of compressed air to clean clothing or surfaces where such activity could contribute to employee exposure to respirable crystalline silica unless: The compressed air is used in conjunction with a ventilation system that effectively captures the dust cloud created by the compressed air; or No alternative method is feasible (requires concurrence with a CIH). 91 Air Monitoring Requirements for Activities with an Assigned RespiratorAPF Listed in Section 4a. Real-time eal-time air monitoring for silica is not required for this project. air monitoring will be conducted_during work activities where employees or contractors are exposed to or have the reasonable probability to be exposed to silica dust hazards. Silica air monitoring will include use of an aerosol monitor equipped with a Dorr-Oliver cyclone kit for respirable dust evaluation. Although not permitted to be the sole method of determining employee exposure, real-time air monitoring for silica will be performed in the employee breathing zone (personal air monitoring) and also performed at the perimeter of the work area (exclusion zone boundary). The results will be documented and submitted to Corporate H&S upon completion of the project. Air samples for laboratory analysis will also be required unless excepted from collection by a CIH. Aerosol monitor selected for use on this project: Frequency of air sample collection for laboratory analysis: Air samples will be submitted to the following laboratory: 6) Medical Surveillance Employees performing work activities where exposure to silica dust is known to be or has a reasonable probability to be above the OSHA 8-Hr TWA action level of 25 pg/m3 will participate in silica medical surveillance in conjunction with their annual HAZWOPER physical. New entrants into the silica medical surveillance program at times when the HAZWOPER physical is not due will coordinate the required surveillance with WorkCare and then maintain the surveillance with their HAZWOPER physical going forward. 7) Additional Instructions When contractors are mixing grout and/or pourign filter pack maintain an upwind position. Signatures: Elena Strom 7/3/2023 Preparer Name Printed Date Preparer Signature