The Director may require the permittee to post a surety bond, irrevocable letter of credit, cash, or other acceptable security before the start of land disturbance activities to guarantee completion of the conditions of the approved stormwater management permit, and after the completion of land disturbance activities to secure the future maintenance of the stormwater system. The form of any financial assurance mechanism shall be approved by the City Solicitor and be in an amount deemed sufficient by the Director pursuant to the rules and regulations promulgated pursuant to §
219-3B of this chapter.