|
(l2) Steep slopes where areas of 12% or more existing over a t Formatted: Butlers and Numbering
<br />distance for 50 feet or more. Deleted: ca„mnnity
<br />13 LocaCion of temporary sedimentation basins - [f more than ~ ` Deleted: Gsp>
<br />10 acres are disturbed and drained to a single point of r` Deleted: <u>For maenwgea to colU
<br />discharge temporary sediment basins must be installed, wa,cr Gshenes, a description and plans to
<br />
<br />however, if the site has sensitive features as determined by i ; I
<br />` control temperatwe from slonnwater
<br />f£p
<br />the Cit or the otential of off site im acts, then tem orar -
<br />'
<br />.--X_.-... 'p- -- -- -~ ---..-..__p__..Y--: :;
<br />oeleted:c°,mn,rnay _
<br />sediment basins musC be installed to protect the resource. ; Deleted: cnn,munay
<br />This is determined on a site by site basis. When site '
<br />
<br />restrictions do not allow for a temporary sediment basin, r Deleted: nvcnry five poroent (2si ~ of
<br />me site area nmesa alonnwater is
<br />equivalent measures such as smaller basins, check dams, conveyed to an approved, omsite or
<br />and vegetated buffer strips can be included. ! Deleted: regional amnnwmer
<br />' ""
<br />l4 ocation and en ineered deli s for structural stormwater ~ ~~ ~.
<br />)J..--.....__.-......g.-_............~`.R._..._-__ ....................._-- b:, ponUing/rotention faoility desibmeU to
<br />
<br />noddle the increased rw,ofiprior
<br />accoml
<br />management practices including stormwater treatment "l ro aiaenwge 6om me sae inm pnmic
<br />devices that remove oil and floatable material e.., baSltt
<br />( g :: waters or wetlands. In designated
<br />shoreland areas the development shall
<br />outlets with submerged entrances). meet the imper.-iona swface rognheme,ns
<br />(15) Normal water level, high water level, and emergency °fmc shnrelanaorainte,ce regaralesa of
<br /> conveyance systems.
<br />overflow elevations for the site. '
<br />i
<br />!
<br />(1G) ,):•loodwayandfloodfringeboundary,ifavailable. i' Deleted: <r,><ap>vnmmc cono-el-
<br />ntaminimm»,tn°fn,tnalr-inch°f
<br /> nmoff from a 24-flow atonn ie inRltratcd
<br />f
<br />d. All proposed stormwater practices, hydrologic models, and design
<br />. ,mless the site is within 2,000 feet ofd
<br />special water where the first flinch of
<br />ity and certified for '
<br />methodologies shall be reviewed by C
<br />: ronoeeer°m a za.how stony, °v<nt anau
<br />,
<br />_ -----.------..-.. _.__.____
<br />_-
<br />compliance by the City in accordance with their plans and ; i be infiltrated. Calculations shall use the
<br />appropriate Hyaromgic sod croup
<br />- - - ---
<br />BpeClflCat10RS.
<br />Classification and saturated infiltra,ion
<br /> rates unless spcufic rates are measwed
<br /> by a registered soil smentrst.`d
<br />B. Stonnwater Management Performance Standards and Design Criteria <q>Scdiment Con[ro1Q
<br />
<br />The applicant shall consider reducing the need for stormwater management <9>For nmv cons,mm~on, design
<br />practices ,o retain soil par,icles greater
<br />performance standards by incorporating the use of natural topography and land ,han 5 microns on the site (80%
<br />
<br />cover such as natural swales and depressions as they exist before development to ~ reducton) resulimg Rom done-year 24-
<br />now storm event, according to appr
<br />the degree that they can accommodate the additional flow of water without prOCC(IUICS, 8na 355Uwing n0 SCO•I°
<br />
<br />compromising the integrity or quality of the receiving waterbody. The resuspension;~
<br /><n>For reaevelopme„t and atreet
<br />development shall minimize impact to significant natural features. Review the reconstnmtion resuhing in exposed
<br />
<br />site for steep slopes (greater than 12%), wetlands, wooded areas of significance, surface parking lots and assoaated tragic
<br />areas, design practices to retain soil
<br />rare and endangered species habitat, areas designated by the County Biological ' partielea greaterman zo,nmronson the
<br />
<br />Survey, metro greenways, or County parks and open space. These areas should enure site (40 % reduction) resulting from
<br />a one-year 24-hountonn event
<br />not be developed. The development shall limit impervious surface coverage.
<br />' a«nramg to approved pro°canrea, and
<br />~
<br />. 1 .
<br />Impervious surface coverage of a site shall not exceec~~hat allowed by CitX
<br />s; nsswning no aod
<br />mont wausp°„slon_
<br />under no circwnatw,cea ahau dro aa~ a
<br />__ _ _
<br />Ordinance. Proposed design, suggested location and phased implementation of I exis,ing sedimem control level or
<br />
<br />effective, practicable stormwater management measures for plans shall be trapping effic,ency be reduced as n result
<br />~ oftlm redevelopment.
<br />designed, engineered and implemented to achieve the following results: ~ <u>Oil and grease `°mrai-F°`°°
<br /> slonnwater plans for commercial or
<br />~•,
<br />r industrial developments and all other uses
<br />.................................__._...-..-_..---.----_-.-.-__-_._--...__...-_-....._-._-_.--_....
<br />1. Volume Control -stormwater runoff volume retention shall be achieved where the potential for pollution by oil or
<br />f
<br />0
<br />b
<br />h
<br />i
<br />h
<br />5
<br />h
<br />
<br />onsite in the amount equivalent to the runoff enerated from a one inch irs,
<br />.
<br />inc
<br />grease, or
<br />ot
<br />, ex
<br />sts, t
<br />e
<br />es
<br />I ofnmoff will be treated using the best oil
<br />rainfall over the impervious surfaces of the development for new and grease ra,noval ,ecnnnl°gy available.
<br />i
<br />h
<br />Thi
<br />b
<br />d b
<br />
<br />development and from a half inch rainfall over the impervious surfaces of e wa
<br />ve
<br />s requmement may
<br />y ,
<br />e
<br />plan reviewer only when ,hc applicam
<br />the development for redevelopment. The required stormwater runoff cw, demonstrate that installation of such
<br />,
<br />t
<br />
<br />volume reduction shall be calculated as follows: `' prac
<br />wes Is no
<br />necessaq~ ~
<br /><u>nnnorrr„teconaol-nyaroi .,, C?]
<br />
<br /> . Formatted: Bullets and Numbering
<br />
|