2006-08-22_PWETC_AgendaPacket - Laserfiche WebLink

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Type of Construction Proposed Stormwater Standards. New 2: 1.0 acre impervious . Rate control for the 1- and I DO-year events . Water quality/infiltration for the 2.8-inch event New < 1.0 acre impervious . Rate control for the 1- and I DO-year events . Water quality/infiltration for the 0.8-inch event Rural to Urban Section . Rate control for the 1- and I DO-year events . Water quality/infiltration for the 0.8-inch event Expansion / Reconstruction . Rate control for the 1- and I DO-year events . Water quality/infiltration for the 0.8-inch event Mill & Overlay . Exempt Pervious Pavement or Pavers .[Exceptions include: I) documented soil contaminants precluding the use of infiltration practices, 2) soil borings documenting high water table preventing adequate separation from water table and 3) linear projects less than 100 LF. In these instances, use of structural devices such as swirl separators or catch basin sumps could be accepted.] As can be seen in the figure below, implementation of these standards District-wide over time can result in fairly significant watershed pollutant load reductions. For additional information and implementation examples on the recommended standards for linear projects, visit the District's TAC webpage (specifically the memo dated 8/5/05). Figure 5. Watershed Loading Reductions realized from Linear Project Standards t' 10.0 c .. .. - .. c.. '" :: 8.0 ;:: - Mesotrophic - '"' '"' .. ~ ~ 6.0 >. - - .. ::J 0' 4.0 Eutrophic .. .. - - .. ::: 2.0 Hypereutrophic 0.0 o Wetland Susceptibility & Management Emmons & Olivier Resources, Inc. + Turtle (43%) Johanna (31 %) + + ~.... ! ++ .\ ++/~:+ 51 ver + (33%) - Valentine (21%) + /' + + 50 100 150 200 Page 60f8