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9 <br /> In order to promote the infiltration of stormwater <br /> runoff into the soil and to minimize direct and <br /> immediate runoff into streams and University Lake <br /> reservoir, impervious surface ratios shall be <br /> required as provided in the Table of Impervious <br /> Surface Ratios for University Lake Watershed - <br /> Section 6. 25. 4 . Modifications of the Impervious <br /> Surface Ratios may be requested, however, in <br /> accordance with the provisions of Section 6.23 .4 . <br /> Impervious surface calculations for an individual <br /> lot shall be cumulative, including the original <br /> construction and any subsequent additions thereto. <br /> The calculation of impervious surface coverage for <br /> an individual lot shall also include one-half of <br /> the street surface on which the lot fronts or <br /> abuts; provided, however, the impervious surface <br /> calculation will not include the surface of any <br /> street existing on April 2, 1990 unless the street <br /> is upgraded to a greater width. In such cases, <br /> only the additional width shall be included in <br /> calculating the 'impervious surface coverage. <br /> It is the intent of this section that the <br /> impervious surface limitations specified herein <br /> shall apply to the entire tract to be developed. <br /> Therefore, if the subdivision involves the creation <br /> of any street or other impervious surface <br /> outside the boundaries of the lots so created, then the <br /> total impervious surface allocation may be <br /> determined as follows: <br /> a. The total area of permissible impervious <br /> surface for the entire subdivision shall be <br /> calculated, applying the percentage <br /> limitations set forth in Table 6. 25. 4 . <br /> b. From the total area calculated pursuant to a. <br /> above, there shall be subtracted the <br /> impervious surface area within streets and <br /> other areas outside of the individual lot <br /> boundaries. <br /> c. Following the calculation set forth in b. <br /> above, the remaining permissible impervious <br /> surface shall be allocated equally to each lot <br /> by the subdivider or as may be approved by the <br /> Zoning Officer. The allocation shall be <br /> indicated on a separate document recorded <br /> together with the final subdivision plat. <br /> For conventional subdivisions to be developed in <br /> accordance with the provisions of Article 6 . 25. 1 <br /> and cluster subdivisions 'to be developed in <br /> accordance with the provisions of Article 6. 25 . 3 , <br />