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SRF Consulting Group, Inc. <br />Phase II Model <br />1. Additional parking lot area (350 cars), building expansion area (3,750 square feet), <br />and associated infiltration basins are incorporated into the model. The proposed <br />impervious areas are assumed to replace (reduce) restored meadow areas within the <br />project area <br />2. Infiltration within the infiltration basin devices is assumed to be low (0.1 in /hr), to <br />match Existing condition and Phase I infiltration assumptions. <br />3. All water from the proposed infiltration devices is routed to the lower pond. <br />4. The proposed elevation of the infiltration devices is assumed to be 810 ft, two feet <br />above the NWL of the Lower Pond. <br />Results are shown in the following table. The project generally shows a reduction in <br />overall phosphorus loading, resulting from the inclusion of both ponding and infiltration <br />measures. The additional parking and building areas in Phase II show a slight increase <br />over that in Phase I as the land converted to parking was no longer considered row <br />crops but rather prairie. Phase II continues to show a decrease in loading compared to-- , <br />the existing condition. <br />H: \Civi1'047\4443 \sent \BWBR\10- 17 -03\P8 Narrative - Eaglebrook.doc <br />