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<br />TABLE 6 <br />EXISTING AND PROPOSED IMPERVIOUS SURFACE AND <br />PROPOSED TREATMENT STRATEGY <br /> <br />. <br /> <br /> Existing 0/0 Future 0/. <br />Descriptio Area (3) Impervious Impervious <br />Surface (4) Surface Comments TreatmentslStrategy <br />n (acres) <br /> Paved/Rooftop Paved/Rooftop <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 of Infiltration basins/wet <br /> 20.9 ac /6.6 ac 13.2 ac / 8.5 ac the existing su b- ponds <br /> watershed moved into <br /> Area III. (2) <br />Area III 19.2 38.5 49.0 Thi s area experienced a Infiltration basins/wet <br /> 4.7 ac 71.9 ac 5.5 ac /3.9 ac net increase of ponds <br /> approximately 2.1 ac. (2) <br />Area IV 10.6 57.3 33.9 Approximately 2.2 ac of Infiltration basin <br /> 4.9 ac /2.4 ac 1.1 ac / 2.5 ac the existing sub- <br /> watcrshed movcd into <br /> Area V. (2) <br />Area V 15.5 12.1 38.2 This area experienced a Infiltration basins/wet <br /> 1.0 ac / 0.5 ac 4.4 ac / 1.6 ac net increase of approx. ponds <br /> 3.3 ac from Areas III <br /> and N. (2) <br />Area VI 3.4 30.4 32.1 This area experienced a None (small drainage <br /> 0.9 ac / 0.0 ac 1.1 ac / 0,0 ac net increase of area connects to <br /> approximately 0.4 ac existing municipal <br /> from Area II. (2) storm sewer) <br />TOTALS 96.9 (I) 52,1 49.9 Overall impervious area <br /> 36.5 ac /14.0 ac 29.3 ac /19.1 ac decreases by roughly <br /> 2.2 ac, Pavement acreage <br /> decreases by roughly <br /> 7,2 ac <br /> <br />. <br /> <br />Source: <br /> <br />Rehder and Associates, Inc., site and utility plan and storm water analysis (August 22, 2002). <br />(I) <br /> <br />Total acreage is higher than that of the AUAR study area because drainage areas extend beyond the <br />ADAR study area. <br /> <br />Notes: <br /> <br />(2) <br /> <br />Numbers arc based on current proposed site and storm water utility plan. <br /> <br />The acreages shown arc for the proposed condition. See Conunent section for description of changes in <br />area between the existing to proposed conditions. <br /> <br />Percent-impervious numbers for the existing condition were calculated based on the existing total <br />drainage area, which may be different than the acreage shown. See the Comment section for a . <br />description of the changes in total acreage. <br /> <br />(3) <br /> <br />(4) <br /> <br />Guidant Campus Master Plan <br />Draft ADAR <br /> <br />- 23 . <br /> <br />September 2002 <br />