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. maintenance agreement shall be executed between the responsible party and the City of Portsmouth. ************************************************* (f) Water Quality Impact Assessment. (3) Minor Water Quality Impact Assessment. A minor water quality impact assessment pertains only to development within an RPA, which causes no more than 5,000 square feet of land disturbance. Submission of a plan of development that demonstrates through the use of calculations provided for by section 9.1-11(D) (I) that the remaining buffer area and necessary best management practices will result in removal of no less than 75% of sediments and 40% of nutrients from post-development storm water runoff shall be deemed to have satisfied the requirement for a minor water quality impact assessment. The following elements shall be included in the preparation and submission of a minor water quality assessment: . a. Site plan indicating the location of the components of the RPA, including the 100-foot buffer area; Location and nature of the proposed encroachment into the buffer area, including: type of paving material, limits for areas of clearing or grading, location of any structures, drives for other impervious cover and sewage disposal systems or reserve drainfield sites; and Type and location of proposed best management practice to mitigate the proposed encroachment. b. c. (4) Major Water Quality Impact Assessment. A major water quality impact assessment shall be required for any development which (i) exceeds 5,000 square feet of land disturbance within an RPA; or (ii) is located in a RMA and is deemed necessary by the City Engineer. The information required in this section shall be considered a minimum. The following elements shall be included in the preparation and submission of a major water quality assessment: a. All of the information required in a minor water quality impact assessment, as specified in Section 9.1-11 F (3); .