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water body or water supply well. (h) A comparison, on a per-acre basis, of the total nutrient loading from the proposed project with the loading rate which would be expected to produce critical eutrophic levels in a water body (.02 mg/litre total phosphorus in fresh water bodies, .75 mg/litre total nitrogen in salt water bodies) or, in the case of a water supply, the load- ing rate which would produce nitrate-nitrogen levels in ex- cess of five (5) parts per million. Where the per-acre loading rate from the proposed project will equal or exceed the critical loading rate when combined with existing and potential development within the recharge area of the water body or water supply well , the Report shall specify j measures to reduce nutrient loading such as sewage treat- ment, reduction of development density, elimination or re- duction of lawn areas and other appropriate measures. 6.5.3 No Definitive Subdivision Plan or Special Permit subject to the provisions of Section 6.5 may be approved by the Planning Board unless it has determined, after reviewing the Water Quality Report and any comments from the Board of Health, that the pro- j posed project will not have a significant adverse affect on public health or safety, aquatic vegetative resources, any fish- eries or shellfish beds or other wildlife due to hazardous or toxic materials, roadway drainage or sedimentation or excessive nutrient levels. Where feasible, the Board shall ensure that the nutrient contribution of the proposed development, when added to the existing and potential nutrient level of other development and acreage within the specific recharge area, will not result, on a pounds-per-acre basis, in nutrient levels that exceed the receiving surface waters' critical eutrophic level or, in the case of well recharge areas, nitrate-nitrogen con- centrations in the well in excess of five (5) parts per million. It shall be the responsibility of the applicant to demonstrate that any pro posed mitigating measures required to produce a negative determination regarding the above items will work as designed, and the Planning Board may require, as a condition of any approval , that the applicant or his successor demonstrate on ' an annual basis that said mitigating measures are operating satisfactorily. The Board may also require the submission of an I . appropriate performance bond to guarantee satisfactory operation of said mitigating measures. i I i 6 - 22