For improvements that are subject to latecomer reimbursement, the Director, after determining that the utility improvements are complete under SMC 15.17.030, shall send a letter to the Owner/Applicant by first class mail, and by certified mail, return receipt requested, requesting the submittal of all data and information in support of the cost of the improvements. The Owner/ Applicant shall submit the data and information within twenty-one (21) calendar days of the date of the letter. If the Owner/Applicant fails to submit the data and information within twenty-one (21) calendar days, or fails to submit any additional data and information requested by the Director within twenty-one (21) calendar days of a request for additional data and information, the Owner/Applicant shall be deemed to have waived the right to reimbursement, and the application shall be null and void and terminated. Upon written request filed with the Director within seven (7) calendar days after any deadline, and upon proof of hardship and/or excusable neglect, the Director may set aside the application termination and grant a period of up to twenty-one (21) calendar days for the Owner/Applicant to submit the data and information. The decision of the Director shall be final.