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development. There shall be two levels of water quality impact assessments: a minor assessment and a major 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 subsection(d)(1) of this section that the remaining buffer area and necessary best management practices will result in removal of no less than 75 percent of sediments and 40 percent of nutrients from post - development stormwater 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, and the RMA (or indication that the remainder of the parcel is designated RMA); b. 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 existing and proposed -structures, drives for other impervious cover, sewage disposal systems or reserve drainfield sites, and a calculation of area of land disturbance within the RPA; and c. Type and location of proposed vegetative mitigation and other best management practices to mitigate the proposed encroachment. (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 subsection (e)(3) of this section; b. A hydrogeological element that: 1. Describes the existing topography, soils, hydrology and geology of the site and adjacent lands; 2. Describes the impacts of the proposed development on topography, soils, hydrology and geology on the site and adjacent lands; 3. Indicates the disturbance or destruction of wetlands and justification for such action; 4. Indicates the disruptions or reductions in the supply of water to wetlands, streams, lakes, rivers or other water bodies; 5. Indicates the disruptions to existing hydrology including wetland and stream circulation patterns; 6. Indicates the source location and description of proposed fill material; 18