COMPLIANCE INFO_2023 ARCADIS REPORT

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U.S. SILICA COMPANY Safety Data Sheet Silica Sand or Ground Silica Page 3 of 9 Where necessary to reduce exposures below the PEL or other applicable limit(if lower than the PEL),wear a respirator approved for silica containing dust when using,handling, storing or disposing of this product or bag. See Section 8, for further information on respirators. Do not alter the respirator. Do not wear a tight-fitting respirator with facial hair such as a beard or mustache that prevents a good face to face piece seal between the respirator and face. Maintain, clean, and fit test respirators in accordance with applicable standards. Wash or vacuum clothing that has become dusty. Participate in training, exposure monitoring, and health surveillance programs to monitor any potential adverse health effects that may be caused by breathing respirable crystalline silica. The OSHA Hazard Communication Standard, 29 CFR Sections 1910.1200, 1915.1200, 1917.28, 1918.90, 1926.59 and 1928.21, and state and local worker or community "right-to-know" laws and regulations should be strictly followed. DO NOT USE U.S. SILICA COMPANY SAND OR GROUND SILICA FOR SAND BLASTING Conditions for safe storage,including any incompatibilities: Use dust collection to trap dust produced during loading and unloading. Keep containers closed and store bags to avoid accidental tearing,breaking,or bursting. 8. EXPOSURE CONTROLS/PERSONAL PROTECTION Exposureguidelines: Component OSHA PEL ACGIH TLV NIOSH REL 10 mg/m3 Crystalline Silica(quartz) %Si02+2 TWA 0.025 mg/m3 TWA 0.05 mg/m3 TWA (respirable dust) (respirable dust) (respirable dust) 30 mg/m3 %Si02+2 TWA (total dust) If crystalline silica(quartz)is heated to more than 870°C, quartz can change to a form of crystalline silica known as tridymite; if crystalline silica(quartz) is heated to more than 1470°C, quartz can change to a form of crystalline silica known as cristobalite. The OSHA PEL for crystalline silica as tridymite or cristobalite is one- half of the OSHA PEL for crystalline silica(quartz). Appropriate engineering controls: Use adequate general or local exhaust ventilation to maintain concentrations in the workplace below the applicable exposure limits listed above. Respiratory protection: If it is not possible to reduce airborne exposure levels to below the OSHA PEL or other applicable limit with ventilation,use the table below to assist you in selecting respirators that will reduce personal exposures to below the OSHA PEL. This table is part of the NIOSH Respirator Selection Logic,2004, Chapter III, Table 1, "Particulate Respirators". The full document can be found at http://www.cdc.gov/niosh/topics/respirators/;the user of this SDS is directed to that site for information concerning respirator selection and use. The assigned protection factor(APF)is the maximum anticipated level of protection provided by each type of respirator worn in accordance with an adequate respiratory protection program. For example, an APF of 10 means that the respirator should reduce the airborne concentration of a particulate by a factor of 10, so that if the workplace concentration of a particulate was 150 ug/m3,then a respirator with an APF of 10 should reduce the concentration of particulate to 15 ug/m3. In using chemical cartridges, consideration must be given to selection of the correct cartridge for the chemical exposure and the maximum use concentration for the cartridge. In additional a cartridge change-out schedule must be developed based on the concentrations in the workplace. Date of preparation/revision: May 4, 2015