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adjaoa�t pond was sined to provide deta�tion volwne above the dad rtorages volume to <br />offset impacts to the Regiona! Detanion Facility. The poed live etcxage volwne in the <br />edjuxM pond was mudmized to ux the uea ellotted for ita inataWtioa Pletse t+efu to <br />the �king FreighVMertill Crxk Stortn Drainage Report, revieed July 29, 1996, for the <br />complete water quality design and detention volume enelyaia. <br />A summery of the status of the deta�tion capacity in the Regional Detaition Facility is <br />provided in our letta to Gordon WRcher dated September 26, 1996 (See Appendix). The <br />detention volume adjusanana presented in that letta were based on the prdintinuq aite <br />plans for this projxt on T�act 2. Bdow is a summary of u� upd�tad andype bsaed on the <br />curtent site p(an. <br />Impavioas Arw Summuy <br />Based on the ratios preseMed in the Saptember 26, 1996 letter, which are derived from <br />earlia correspondence with the City, the updated deta�tion volume requirema►c wes <br />calculated as: <br />21.27 Ac - Impervious _ 21.32 Ac - Impervious <br />230Ac-Ft xAc-Ft <br />Where x is the new required detention volume, and if solvod for, oquals 2.31 ao-ft of <br />detention volume. The increase in detention volume roquired is due to the increaae� <br />impervious area calculated for this site. The detention requirements of all the sites <br />S�orm Drainage Reporl For Seaway Trxt 1, Lots / d� 1- Page 3 <br />\:/ <br />