The Occupational Safety and Health Administration (OSHA) conducted an inspection of Respondent’s worksite located at 6903 Maidford Drive, Colorado Springs, Colorado on May 15, 2021. See ¶ 2 of Response. On June 6, 2021, OSHA issued one citation with two serious items (“Citation”) to Respondent. See ¶ 4 of Response. The Citation proposed Respondent pay a penalty in the amount of $4,681.00. Id. OSHA mailed the Citation to Respondent via United States Postal Service (“USPS”) certified mail on June 7, 2021. Id. The Citation was sent to the business address provided during the inspection, which was identified as 210 Fifth Street, Suite 200, Castle Rock, Colorado 80104. Id. The certified mail green card indicates the Citation was delivered to an individual at that address who signed for and accepted it on June 10, 2021. See Exh. C to and ¶ 4 of Response.