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<br />I <br /> <br />I. <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br />Ie <br />I <br /> <br />I <br />I <br /> <br />I <br /> <br />I <br />I <br />I. <br />I <br /> <br />I <br /> <br />TABLE 6 <br />EXISTING AND PROPOSED IMPERVIOUS SURFACE AND <br />PROPOSED TREATMENT STRATEGY <br /> <br /> Existing % Future % <br /> Area()) Impervious Impervious <br />Description (acres) Surface (4) Surface Comments Treatmeuts\Strategy <br /> Paved/Rooftop PavedIRooftop <br /> Area Area <br />Areal 9.7 69.0 69.0 None (no changes to <br /> 4.1 ac / 2.6 ac 4.1 ac / 2.6 ac existing) <br />Area II 38.5 65.2 56.3 Approximately 3.3 ac Infiltration basins/wet <br /> 20.9 ac / 6.6 ac 13.2 ac / 8.5 ac of the existing sub- ponds <br /> watershed moved into <br /> Area III. (2) <br />Area III 19.2 38.5 49.0 This area experienced Infiltration basins/wet <br /> 4.7 ac/ l.9 ac 5.5 ac / 3.9 ac a net increase of ponds <br /> approximately 2.1 ac. <br /> (2) <br />Area IV 10.6 57.3 33.9 Approximately 2.2 ac Infiltration basin <br /> 4.9 ac / 2.4 ac 1.1 ac /2.5 ac ofthe existing sub- <br /> watershed movcd into <br /> Area V. (2) <br /> . <br />Area V 15.5 12.1 38.2 This area experienced Infiltration basins/wet <br /> l.0 ac / 0.5 ac 4.4 ac / 1.6 ac a net increase of ponds <br /> approx. 3.3 ac from <br /> Areas 1II and IV. (2) <br />Area VI 3.4 30.4 32.1 This area experienced None (small drainage <br /> 0.9 ac / 0.0 ac 1.1 ac / 0.0 ac a net increase of area connects to <br /> approximately 0.4 ac existing municipal <br /> from Area II. (2) stonn sewer) <br />TOTALS 96.9 (l) 52.1 49.9 Overall impervious <br /> 36.5 ac / 14.0 ac 29.3 ac /19.1 ac area decreases by <br /> roughly 2.2 ac. <br /> Pavement acreage <br /> decreases by roughly <br /> 7.2 ac <br /> <br />Source: <br />Notes: <br /> <br />Rehder and Associates, Inc., site and utility plan and stann water analysis (August 22, 2002). <br />(I) Total acreage is higher than that of the ADAR study area because drainage areas extend beyond the <br />AUAR study area. <br /> <br />(2) <br /> <br />Numbers arc based on current proposed site and storm water utility plan. <br />The acreages shown are for the proposed condition. See COlmnent column for description of changes in <br />area between the existing to future conditions. <br />Percent-impervious numbers for the existing condition were calculated based on the existing total <br />drainage area, \vhich may be different than the acreage shown. See the Comment column for a <br />description of the changes in total acreage. <br /> <br />(l) <br /> <br />(4) <br /> <br />Guidam Campus Master Plan <br />Final A\JAR and Mitigation Plan <br /> <br />January 2003 <br /> <br />- 23- <br />