07/29/2009 Env Bd Packet - Laserfiche WebLink

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(iii) Restoration of Degraded Wetland — Restoring hydrology and native vegetative cover to a partially drained wetland. (a) No excavation is permitted; limited scraping is allowed. (b) No credit will be given for open water wetland. (c) Wetland treatment systems required to meet paragraph 8(b)(i) do not qualify for this credit. (iv) Impervious Disconnection — Spreading of runoff from small parking lots, courtyards, driveways, sidewalks and other impervious surfaces into adjacent pervious areas where it is filtered or infiltrated to promote volume reduction. (a)The contributing flow path from impervious cover must not exceed 75 feet. (b) In all cases, the disconnection length must exceed the contributing flow path. (c) Pervious area used for disconnection must have a slope no greater than five percent. (d) The total surface impervious area contributing to a single discharge point shall not exceed 1,000 ft2 and shall drain continuously through a pervious filter strip until it reaches the property line or drainage swale. (e) Soil tilling to restore infiltration potential is required to restore porosity in graded /disturbed areas that will contribute to runoff connection length. (f) Impervious disconnection and credit values must comply with District standard plates and design criteria. (v) Soil Compaction Mitigation — Upland areas protected from grading during construction, tilling of permeable soils compacted during construction, or amending and tilling of low- permeability soils compacted during construction. (a) This credit may be combined with the impervious disconnection credit. (b) Soil Compaction Mitigation must comply with District standard plates and design criteria. (c) The District must be contacted 48 -hours prior to soil compaction mitigation activities for verification of compliance