Before the signing and recording of final subdivision plats the applicant shall have installed under the inspection of the Borough Engineer, all improvements required unless the applicant has posted and the Governing Body accepted, a performance guarantee providing for such installation. The amount of the guarantee shall be determined by the Borough Engineer, not to exceed 120% of the estimated cost of constructing the improvement including but not limited to, streets, curbs, grading, pavement gutters, sidewalks, street lighting, shade trees, surveyors monuments, water mains, culverts, storm sewers, sanitary sewers, drainage structures, soil erosion and sediment control devices.