kane county stormwater technical guidance manual - Kane County, IL

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At a minimum the 2-year and 10-year runoff rates for all off-site flows need to be shown along with an appropriate method for conveying the flows without increased velocities or erosion from within the construction site. A maintenance schedule and weekly inspection worksheet should also be included. The maintenance schedule should be placed on the erosion and sediment control plan sheet. Form 12 shows an inspection worksheet. The inspection shall evaluate stabilization as well as sediment control. Inspections shall be scheduled weekly and after 0.5 inch of rainfall or greater until permanent stabilization has been completely established. Weekly inspections may be reduced upon installation of permanent stabilization. § T300(i) Conveyance of Off-Site Flow Ditches and waterways that convey off-site flow through the site shall be permanently stabilized upon construction. The permanent stabilization should replace temporary measures but it may be necessary to leave some temporary measures in place while the permanent stabilization establishes. Stabilization of off-site conveyance must protect the downstream land from erosion and sedimentation. Permanent stabilization must therefore include velocity reduction features at the property boundary. Use of level spreaders, lined aprons, and drop inlet pipe spillways are preferred. § T300(j) Stockpiles Stockpiles are not to be placed in any special management areas or buffers. When stockpiles remain for more than 3 days they require temporary stabilization. An adequate distance should be kept between the stockpile and special management areas such that maintenance of stabilization can be performed without entry into the special management area. § T300(l) Construction Dewatering Discharge from site dewatering activities must be maintained in a manner that does not increase on-site erosion, convey sediment off-site or cause off-site flood damages. Dewatering discharge may not be outletted into wetlands on or off-site where practicable, discharge from on-site dewatering shall be routed into the site sediment basin. Thus, sediment basin volume of storage should include site dewatering. § T300(m) Protection of Public/Private Roadways Public and private roadways must be kept free of nuisance soil. Access to the site must be large enough to provide a stabilized construction entrance (Figure 17) of sufficient width and length, on-site parking, and vehicle washdown facility where appropriate. Soil tracked onto public right-of-way <strong>Kane</strong> <strong>County</strong> Technical Guidance Manual 57
must be cleaned before the end of each workday. Street sweeping provides a mechanism for removal of loose soil materials, but may not be sufficient to remove materials compacted onto the roadway surfaces. Removal of such compacted materials during each workday and when required by the Administrator is also required. Removal of adhered soil materials will be done in a manner that does not damage the roadway or other right-of-way appurtenances. § T300(n) Temporary Stream Crossings Temporary stream crossings (bridges, fords, and culvert crossings) should be designed for short-term use periods not to exceed 1 year. Temporary stream crossings are to be used only where there is no practicable alternative for moving heavy equipment from one side of a stream channel to another or where light duty equipment must cross a stream frequently for a very short period (
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KANE COUNTY STORMWATER TECHNICAL GU
Page 3 and 4:
Kane County Technical Guidance Manu
Page 5 and 6:
ARTICLE 13 - FEE-IN-LIEU OF SITE RU
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No. Name LIST OF FIGURES Kane Count
Page 9 and 10:
Organization The Manual is comprise
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ARTICLE 2 - REQUIREMENTS FOR STORMW
Page 13 and 14: applicant to provide retention volu
Page 15 and 16: § T201(e) Protection of Buildings
Page 17 and 18: § T201(f) Planning Principles Meet
Page 19 and 20: 1. Identify all points where runoff
Page 21 and 22: FIGURE 3 Detention Example (continu
Page 23 and 24: 3. Calculating overland flow paths
Page 25 and 26: soil tributary to the downstream sy
Page 27 and 28: purpose of the easement is for main
Page 29 and 30: In general: 1. Impervious surfaces
Page 31 and 32: FIGURE 5 Hydrologically Disturbed A
Page 33 and 34: TABLE 4 Huff Quartile Distributions
Page 35 and 36: FIGURE 6 Median Time Distribution o
Page 37 and 38: All runoff volumes shall be calcula
Page 39 and 40: The retention volume may be reduced
Page 41 and 42: FIGURE 9 Detention Configuration fo
Page 43 and 44: FIGURE 11 Detention Configuration f
Page 45 and 46: FIGURE 13 Separation for Subsurface
Page 47 and 48: § T203(i) Site Runoff Storage Faci
Page 49 and 50: etter information is submitted and
Page 51 and 52: Surface Erosion Factor Subsoil Eros
Page 53 and 54: TABLE 7 Seed Mixtures For Temporary
Page 55 and 56: § T300(d) Extended Construction Sh
Page 57 and 58: FIGURE 14A Sediment Control Practic
Page 59 and 60: Figure 15A Soil Stabilization Pract
Page 61 and 62: § T300(g) Limitation on Site Distu
Page 63: TABLE 8 Permanent Stabilization Pra
Page 67 and 68: ARTICLE 4 - PROTECTION OF SPECIAL M
Page 69 and 70: For projects where no Regulatory Fl
Page 71 and 72: Residential Buildings The Ordinance
Page 73 and 74: nonresidential), the flood insuranc
Page 75 and 76: FIGURE 18 Required Flood Protection
Page 77 and 78: § T409 Lowest Opening Proposed str
Page 79 and 80: crossing. The floodplain downstream
Page 81 and 82: any revised floodway or will agree,
Page 83 and 84: Illinois Department of Natural Reso
Page 85 and 86: applicant will have to manually adj
Page 87 and 88: exception of the appropriate use re
Page 89 and 90: For all on-site wetlands with buffe
Page 91 and 92: Site: Kane County Stormwater Exampl
Page 93 and 94: § T415 Mitigation to be Local All
Page 95 and 96: FIGURE 21 Linear and Water Body Buf
Page 97 and 98: TABLE 11 Linear Buffer Width Calcul
Page 99 and 100: FIGURE 22 Buffer Width Scenarios Ka
Page 101 and 102: FIGURE 23 Measurement Reference for
Page 103 and 104: ARTICLE 5 - STORMWATER MANAGEMENT P
Page 105 and 106: § T502(a) Required Submittals If t
Page 107 and 108: An example of a narrative descripti
Page 109 and 110: ) Buffer Requirements. The buffer r
Page 111 and 112: ARTICLE 6 - LONG-TERM MAINTENANCE T
Page 113 and 114: 90% of the slopes, as measured by a
Page 115 and 116:
ARTICLE 7 - ENFORCEMENT AND PENALIT
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§ T1500 General ARTICLE 15 - WETLA
Page 119 and 120:
TABLE 14 Mitigation Requirements Mi
Page 121 and 122:
etween wetland mitigation facilitie
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Director will reduce the wetland pe
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FORMS The following sheets contain
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KANE COUNTY STORMWATER MANAGEMENT P
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Identifier 2A 2B 2C 2D 2E 2F 2G 2H
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Identifier 4A 4B 4C 4C-1 4C-2 4C-3
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Identifier 5D-3 5D-4 5D-5 5D-6 5D-7
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Identifier Kane County Stormwater M
Page 137 and 138:
COMMUNITY CONTACT FOR STORMWATER MA
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CERTIFIED COMMUNITY FORM FOR EXEMPT
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INSPECTION CHECKLIST DURING CONSTRU
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DEVELOPER’S STATEMENT Right to Dr
Page 145 and 146:
APPENDICES Kane County Technical Gu
Page 147 and 148:
TABLE A2 Typical Roughness Coeffici
Page 149 and 150:
TABLE A2 (continued) Typical Roughn
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kane county stormwater technical guidance manual - Kane County, IL

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