The performance guaranty must run in favor of the Township, and be in an amount not to exceed 120%, rounded to the nearest dollar, of the cost of installation of improvements the Township or Reviewing Board may deem necessary or appropriate, including, but not limited to, streets, grading, pavement, gutters, curbs, sidewalks, street lighting, shade trees, surveyor's monuments (as shown on the final map and required by the Map Filing Law, (N.J.S.A. 46:23-9.9), water mains, culverts, storm sewers, sanitary sewers or other means of sewage disposal, drainage structures, erosion control and sedimentation control devices, public improvements and landscaping, provided that no more than 10% of the total performance guaranty shall be in cash and the balance shall be in the form of a surety bond issued by a bonding company licensed to do business in the State of New Jersey and rated A+ or better by A.M. Best or a letter of credit issued by a banking institution licensed to do business in the State of New Jersey. Such bond or letter of credit must be approved and accepted by the Township governing body. The Township Engineer shall review the improvements required by the Reviewing Board which are to be bonded and itemize their cost. This itemization shall be the basis for determining the amount of the performance guaranty required by the Township and the inspection fees required by this Code. The Township Engineer shall forward his/her estimate of the cost of improvements to the applicant within 30 days after the date of receipt of a request sent by certified mail for this estimate. Any performance guaranty delivered to the Township Clerk pursuant to this section shall be for an initial term of not less than two years, shall provide for automatic one year renewals and shall only be terminable on the date of expiration, either of the original period or any renewal period, upon not less than 60 days advanced written notice. In the event that any of the improvements to be installed are covered by a performance guaranty to another governmental agency, no performance guaranty shall be required from the Township for such improvements.