1125 80TH ST SW 2016-01-01 MF Import

PUBLIC WORKS Err MEMORANDUM `✓41,o F'lrc�'LL- TO: -Kirk Brooks/AI Locke FROM: JaV. ` 259-8015 DATE: Avg �4- SUBJECT: Drainage Calculation Review, Dennis Petroleum Tn r "A The MDNS condition regarding infiltration of roof-top runoff must be addressed y (please see 7/14/95 calculation review memo). If suitable soil conditions do not exist on the site, that fact should be stated in the drainage calculations, or addressed in the cover letter. The MD § state 'thaAt nn lX co nee on p 'm ovi d f r to mu 12 .thc sto ateon atme cilities vided the De ium site ease4/95ation view m ). Th pass lin ust be constructed i theq ' uljlem t I cated on the aste ed of is ptoperty,.yr4e Cify -eic, S >'haf )f6e SygrYi and �in.�,rye 1/i7rr 6r e.rf4..�J•v AV 461' 2 r Sov/oy •-o�e.r Linr shot f'Ytiit- r/V,•ta lyo.,w7t A/U!/(d hvJ`�t�v�6e 4lef �dPMLt/q,f'/�w�»�: The storm drainage facilities on this site, must he designed for runoff from the Dennis Petroleum site and the access road only. ¢ The SBUIi calculations should = take into account for runoff from lot I, in either the Z4'orr pre-development or post-development calculations. Future development on lot I will 03k'vVA collect runoff at the northeast corner of that site, and will discharge to the bypass line BZ�-95 provided in the 25' utility casement on the Dennis Petroleum site. In addition, development on the Dennis Petroleum site will/should prevent runoff from sheet flowing onto the site from lot 1. -Provision must be made at the southeast comer-efthe Dennis Petroleum siloao-piek-up-surfac*-runoff from lot-I-and-lirectittc the-hypacs line- The pervious arca CNs and times of concentration should be different for pre- and post-development SBUIi calculations. Oil/water separator calculations are still needed per the 7/1 ' S calculation review memo.