The amount of the performance bond shall be sufficient to cover the cost of any proposed or required site improvement such as street grading; roadway paving and street planting; the installation of curbs, gutters, storm drainage facilities, landscaping, sidewalks, monuments, bridges, and culverts; erosion and sediment control measures; site stabilization measures; and all other such improvements that the Commission deems necessary to promote public health and safety and to safeguard the Town from undue expense in regard to the future maintenance of said improvements. All improvements shall be designed in accordance with established standards, rules and regulations applicable in the Town of Haddam. The Commission may require that a separate cash performance bond be posted for all erosion and sediment control and site stabilization measures.