641—20.5 (135) Project contracts. The department shall execute a contract with each grantee for the amount awarded. The grantee shall not install, construct or purchase any equipment, chemical or service except preliminary consultation services under the terms of 20.6(1)“b” before the execution of a contract with the department.
	 20.5(1) The grantee shall agree to arrange for the installation of a fluoridation system, to procure fluoride chemical and to operate and monitor the equipment within the requirements of the department for a period of five years from the date fluoridation operation is started.
	  a.   	 The grantee shall analyze water samples for fluoride content as required by the rules of the department of natural resources and shall report the results of the analyses to the department monthly.
	  b.   	 The grantee shall submit at least one split sample per month to a laboratory certified by the department of natural resources for the analysis of fluoride in drinking water. The results of this analysis shall be reported to the department at least monthly. If a water system operated by a grantee serves fewer than 500 persons, the frequency of sample submission shall be at least one per calendar quarter.
	  c.   	 The grantee shall notify the department within 5 business days if the operation of the fluoridation equipment is interrupted for more than 14 consecutive days. The notification shall include the reason for the interruption and its anticipated duration.
	 20.5(2) The department shall agree to reimburse the grantee for the cost of the fluoridation system.