Grand Ridge Wind Farm ProjectPhase I, Phase II and III
Storm Water Pollution Prevention Planfor
Construction Activities
Prepared forGrand Ridge Energy LLC
Grand Ridge Energy II, LLCGrand Ridge Energy III, LLC
Prepared by
HDR Engineering, Inc.701 Xenia Avenue South, Suite 600
Minneapolis, MN 55416
September 2007 (Revised August 2008, October 2008)
Grand Ridge Wind Farm Project (Phase I, II, and III)
Storm Water Pollution Prevention Plan i October 2008
Table of Contents
1.0 CERTIFICATION STATEMENT.................................................................................. 1
2.0 NPDES REQUIREMENTS ............................................................................................. 2
3.0 PROJECT DESCRIPTION ............................................................................................. 3
4.0 POTENTIAL FOR STORM WATER POLLUTION................................................... 64.1. Land Use .................................................................................................................... 64.2. Soils............................................................................................................................. 64.3. Precipitation .............................................................................................................. 7
5.0 CONSTRUCTION ACTIVITIES ................................................................................. 105.1. Access Road ............................................................................................................. 105.2. Wind Turbine Foundations.................................................................................... 105.3. Trenching of Underground Electrical and Communication Cables .................. 115.4. Construction of Facilities – Operation and Maintenance Facility ..................... 115.5. Construction of Facilities – Substation ................................................................. 115.6. Dewatering (if needed)............................................................................................ 11
6.0 TEMPORARY EROSION AND SEDIMENT CONTROL BMPS............................ 126.1. Control of Surface Water....................................................................................... 136.2. Culvert Protection................................................................................................... 136.3. Ditch Protection ...................................................................................................... 136.4. Mulch ....................................................................................................................... 136.5. Preserve Existing Vegetation ................................................................................. 146.6. Sediment Traps ....................................................................................................... 146.7. Silt Fence.................................................................................................................. 146.8. Slope Protection ...................................................................................................... 146.9. Street Cleaning ........................................................................................................ 156.10. Temporary Construction Entrances/Exits ........................................................... 156.11. Temporary Seeding................................................................................................. 156.12. Topsoil Segregation and Stockpile Protection Area ............................................ 16
7.0 PERMANENT EROSION AND SEDIMENT CONTROL BMPS............................ 187.1. Riprap ...................................................................................................................... 197.2. Turf Establishment ................................................................................................. 19
8.0 INSPECTION AND MAINTENANCE ........................................................................ 238.1. Inspection................................................................................................................. 238.2. Maintenance ............................................................................................................ 23
9.0 POLLUTION PREVENTION MANAGEMENT MEASURES ................................ 259.1. Spills Clean .............................................................................................................. 259.2. Trash and Debris..................................................................................................... 259.3. Hazardous Materials .............................................................................................. 259.4. Truck Washing........................................................................................................ 25
Grand Ridge Wind Farm Project (Phase I, II, and III)
Storm Water Pollution Prevention Plan ii October 2008
9.5. Dust Control ............................................................................................................ 25
10.0 PLAN MODIFICATIONS ............................................................................................. 26
11.0 NOTICE OF TERMINATION...................................................................................... 27
12.0 RECORD RETENTION ................................................................................................ 28
List of Figures
FIGURE 1 PROJECT LOCATION MAP ............................................................................................. 4FIGURE 2 DRAINAGE MAP ............................................................................................................. 5FIGURE 3 LAND USE ....................................................................................................................... 8FIGURE 4 SOILS .............................................................................................................................. 9FIGURE 5 EROSION CONTROL PLAN PHASE II............................................................................ 17FIGURE 6 EROSION CONTROL PLAN PHASE III………………………………………………..18
List of Tables
TABLE 1 SEED MIXTURE .............................................................................................................. 15
List of Appendices
Appendix A IEPA General Construction Permit –ILR10Appendix B Drainage StudyAppendix C Revision DocumentationAppendix D Erosion Control DetailsAppendix E Inspection LogAppendix F Incidence of NoncomplianceAppendix G Notice of Termination
Grand Ridge Wind Farm Project (Phase I, II, and III)
Storm Water Pollution Prevention Plan 1 October 2008
1.0 CERTIFICATION STATEMENT
Responsible Official Certification:
As the Responsible Official with the authority to commit personnel, financial, and otherresources to assure compliance with this Storm Water Pollution Prevention Plan (SWPPP),I certify under penalty of law that this document and all attachments were prepared under mydirection or supervision in accordance with a system designed to assure that qualified personnelproperly gathered and evaluated the information submitted. Based on my inquiry of theperson(s) who manage the system and those directly responsible for preparing this plan, theinformation contained in this document is, to the best of my knowledge and belief, true, accurate,and complete. I am aware that there are significant penalties for submitting false information,including the possibility of fine and imprisonment for knowing violations.
Date: _______________________________________________Name __Art Fletcher___________________________________Title: __Project Manager_______________________________Signature: ______________________________________________
Contractor Certification
The Owners (Grand Ridge Energy LLC, Grand Ridge Energy II LLC, and Grand Ridge EnergyIII LLC) has been identified as the project contractor (Contractor); therefore, additionalcertification is not required. However, if the Contractor should change, the SWPPP must bemodified to clearly identify contractor(s) or subcontractor(s) responsible for each activityassociated with constructing this project. In addition, contractor(s) and subcontractor(s) mustsign the following certification statement before conducting any professional service at the site.
“I certify under penalty of law that I understand the terms and conditions of the generalnational pollutant discharge elimination system (NPDES) permit (ILR10) that authorizesthe storm water discharges associated with industrial activity from the construction siteidentified as part of this certification.”
Grand Ridge Wind Farm Project (Phase I, II, and III)
Storm Water Pollution Prevention Plan 2 October 2008
2.0 NPDES REQUIREMENTS
Construction activities resulting in disturbance of one acre or more of land must be coveredunder the National Pollutant Discharge Elimination System (NPDES) General Permit forConstruction Activities. In addition, sites disturbing less than one acre within in a largercommon plan of development or sale that is more than one acre, also need NPDES Permitcoverage. A SWPPP must be crafted to meet the site-specific requirements of each project. TheOwner shall submit to the Illinois Environmental Protection Agency (IEPA) a Notice of Intent(NOI) at least thirty (30) calendar days prior to the commencement of construction activities.The SWPPP should not be submitted with the NOI; however, it must be completed before thestart of construction.
A typical SWPPP covers five items:
1. Temporary erosion and sediment control best management practice (BMPs)
2. Permanent erosion and sediment control BMPs
3. Permanent storm water management
4. Pollution prevention management measures
5. Inspection and maintenance
A copy of the IEPA General NPDES Permit for Storm Water Discharge from ConstructionActivity (ILR10) and the project notices of intents are included in Appendix A.
Grand Ridge Wind Farm Project (Phase I, II, and III)
Storm Water Pollution Prevention Plan 3 October 2008
3.0 PROJECT DESCRIPTION
The Grand Ridge Wind Farm Project, which encompasses Phases I, II, and III will beapproximately 250 megawatts (MW), consisting of the construction of up to 166 wind turbines,operation and maintenance (O&M) building, project substation, approximately 1.5 milegenerator lead line and collection system, and switchyard located in LaSalle County, Illinois(Figure 1). Phase I, includes 66 turbines, access roads, the O&M building, the substation and thegenerator lead line and collection system. Phases II and III consists of 34 and 66 turbines andaccess roads, respectively The total project area is 71,300 acres with the expected area ofdisturbance being approximately 175 acres. The receiving waters are unnamed tributaries ofWaupecan Creek, Otter Creek, Covel Creek, Hog Run, and Kickapoo Creek.
A drainage study was conducted on the proposed project area to determine the impact ofconstruction on the existing drainage system (Figure 2). Using the methodology prescribed in theNational Resources Conservation Service Technical Release 55 (TR-55) – Urban Hydrology forSmall Watershed, the study concluded that the impacts to the existing drainage system would bewell within the standard margin of error and thereby rendering the impact insignificant. Thecomplete drainage study is in Appendix B for review.
Construction slated for this site involves activities that shall expose soil to erosion. The activitiescovered in the SWPPP include the following:
• Clearing and grading
• Construction of the facility – Site access road
• Construction of the facility – Wind turbine foundations
• Trenching of underground electrical (collection) and communication cables
• Construction of the facility - operation and maintenance facility
• Construction of the facility - substation
• Dewatering
The conditions used to select erosion and sediment control BMPs include the following:
• Land use
• Soil type
• Precipitation
Grand Ridge Wind Farm Project (Phase I, II, and III)
Storm Water Pollution Prevention Plan 4 October 2008
Figure 1 Project Location Map
0th Rd
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Irene St
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PavillionSt
DannyDr
31N 3E OtterCreek
31N 4E
Allen31N 5E
32N 3E
GrandRapids32N 4E
Brookfield32N 5E
33N 3E 33N 4E 33N 5E 33N6E
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Project Location
0 1 20.5
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LegendProject Boundary Phase I
Phase II Project Site
Phase III Project Site
Existing Transmission 138kV
Existing Transmission 345kV
Generator Lead Line
Township Boundary
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Grand RidgePhase I, II & III
LaSalle County, Illinois
Grand Ridge Phase I, II & IIIProject Area Location
L A S A L L EL A S A L L E
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UN
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GR
UN
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BU
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Figure 1
Grand Ridge Wind Farm Project (Phase I, II, and III)
Storm Water Pollution Prevention Plan 5 October 2008
Figure 2 Drainage Map
Ransom
Grand RidgeBrookfield32N 5E
Grand Rapids32N 4E
Allen31N 5E
Otter Creek31N 4E
32N 3E
31N 3E
33N 4E 33N 5E33N 3E
99
97
96
95
93
8887
84
207
202203204
205
162
161
160
159
158157
156
155154152
151150
149148
147144
142
141
138137
136135
134133
132 130
129128
127
126
125
124
123
122
120
119118
117
116114
113112111
110
109
108
106 105
104103
102101
10094B
92B91B
90B89B
86B
85B83B
82B
80B
78B
69B 23B
146C145C
166B
165B
164B
163B
153B
146B145B
143B
140B
139B
131B121B
115B
107B
N 19th Rd
N 20th Rd
N 18th Rd
N 23rd Rd
E18
thR
d
E24
thR
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N 22nd Rd
E21
stR
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E23
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N 15th Rd
E20
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W26
thR
dE
26th
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E28
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E25
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E29
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N 2379th Rd
E26
50th
Rd
Broo
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2609
thR
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Marrilla Park Rd
Lane
St
Forrest Rd
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59th
Rd
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E26
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E20
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E28
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N 22nd Rd
N 2350th Rd
N 1475th Rd
850000.000000
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LegendDelineations_Ph_I,_II_and_III
Phase III
Phase II
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Turbine_Ph_II_and_III
Access Roads_Ph_II_and_III
Turbines_Ph_I
AccessRoads_Ph_I
Collection System
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Grand RidgePhase I, II & III
LaSalle County, Illinois
Grand Ridge Phase II & IIIProject Area Location
L A S A L L EL A S A L L E
WIL
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L I V I N G S T O NL I V I N G S T O N
GR
UN
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GR
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FO
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FO
RD
M A R S H A L LM A R S H A L L
K E N D A L LK E N D A L L
P U T N A MP U T N A M
K A N K A K EK A N K A K E
I R O Q UI R O Q U
L E EL E EFigure 2
Grand Ridge Wind Farm Project (Phase I, II, and III)
Storm Water Pollution Prevention Plan 6 October 2008
4.0 POTENTIAL FOR STORM WATER POLLUTION
4.1. LAND USE
Land use of the project area was determined based on a review of aerial photographs and LaSalleCounty land cover data (Figure 3). The dominant land use of the project area is farmland,consisting of 90 percent of the project area. Corn, soybean and wheat are the predominant cropin the project area. The remainder of the project area consists of road right-of-way, non-agriculture, farmstead sites, and permanent pasture. The landscape in the project area isrelatively flat with gently rolling hills.
4.2. SOILS
There are six soils associations found within the project area: Catlin-Flanagan-Drummer, Plano-Proctor-Worthen, St Clair-Nappanee-Frank, St. Charles-Camden-Drury, Swygert-Bryce-Mokena, Varna-Elliott-Ashkum, and Wenona-Rutland-Streator (Figure 4).
The Catlin-Flanagan-Drummer Association covers approximately a quarter of the site. Thisassociation is composed of very deep, moderately well-drained to poorly-drained soils on loess.Moderately well-drained soils and somewhat poorly-drained soils in this association occur onconvex slopes. Poorly-drained soils in this association are found on nearly level or depressionalstream terraces, outwash plains, and till plains. Most soils in this association are cultivated.Native vegetation is generally prairie grasses, with some marsh species interspersed.
The Plano-Proctor-Worthen Association comprises very deep, well-drained soils on streamterraces. The soils are formed in loam or silty outwash. This association makes up a smallportion of the project area. Most areas are cultivated and native vegetation consists of prairiegrasses.
The St. Clair-Nappanee-Frank Association consists of very deep soils that are moderately well-drained to somewhat poorly-drained on glacial till on ground moraines and lake plains. Thisassociation makes up a very small portion of the project area. The soils are generally cultivatedor used for pasture. The native vegetation is deciduous forest.
The St. Charles-Camden-Drury Association consists of deep to very deep, well-drained soils onoutwash plains and along stream terraces. They tend to occur along the base of side-slopes aswell as within stream terraces and alluvial plains. Most soils are cultivated but some areas areused as pasture or have woodland cover. The association makes up a very small portion of theProject area (less than one percent). Native vegetation is generally mixed hardwood forest.
Grand Ridge Wind Farm Project (Phase I, II, and III)
Storm Water Pollution Prevention Plan 7 October 2008
The Swygert-Bryce-Mokena Association is the dominant soil association in the project area andcovers over one third of the site. Swygert-Bryce-Mokena is composed of very deep to deep soilsformed in clayey-till, loess and lacustrine deposits, and range from poorly-drained to somewhatpoorly-drained. Most soils in this association are cultivated in areas that have been convertedfrom native prairie and marshland.
The Varna-Elliott-Ashkum Association consists of very deep, moderately well-drained to poorly-drained soils on till plains. This association makes up a small portion of the project area.Moderately well-drained soils and somewhat poorly-drained soils in this association occur onconvex slopes. Poorly drained soils in this association are found on colluvial positions and inupland drainageways. Most soils in this association are cultivated. Native vegetation isgenerally prairie grasses, with some marsh species interspersed.
The Wenona-Rutland-Streator Association covers approximately one quarter of the site. Thisassociation is composed of deep to very deep soils formed in lacustrine deposits, clayey till, andloess, which are moderately well-drained to poorly-drained. Well-drained soils in thisassociation occur on convex summits. Somewhat poorly and poorly-drained soils in thisassociation are found on nearly level lake planes. Most soils in this association are cultivated.Native vegetation is generally prairie grasses and marsh species.
4.3. PRECIPITATION
Average yearly rainfall, for this part of Illinois according to Technical Paper 401, ranges from 26to 29 inches. Individual storms during spring and summer can produce significant quantities ofrainfall. For instance, a one-year/24-hour storm can produce approximately 2.5 inches ofrainfall, and 2.9 inches for a two-year/24-hour storm. Storm water management will be neededto manage runoff during and after construction.
Without erosion and sediment control BMPs, the project could produce significant amounts ofsediment. The function of the SWPPP is to outline procedures to minimize erosion and mitigatesediment during construction.
1 Technical Paper No. 40: Rainfall Frequency Atlas of the United Stated for Durations from 30 Minutes to 24 Hoursand Return Periods from 1 to 100 Years. May 1961. United States Department of Commerce: Washington D. C.
Grand Ridge Wind Farm Project (Phase I, II, and III)
Storm Water Pollution Prevention Plan 8 October 2008
Figure 3Land Use
Ransom
Grand Ridge Brookfield32N 5E
Allen31N 5E
Grand Rapids32N 4E
Otter Creek31N 4E
32N 3E
31N 3E
33N 4E 33N 5E33N 3E 33N 6E
Vienna32N 6E
Highland31N 6E
N 19th Rd
N 20th Rd
N 18th Rd
E18
thR
d
N 23rd Rd
E24
thR
d
N 16th Rd
E21
stR
d
E23
rdR
d
N 15th Rd
N 24th Rd
E20
thR
d
W26
thR
dE
26th
Rd
E28
thR
d
E25
thR
d
E29
thR
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N 2350th Rd
E19
thR
d
N 22nd Rd
N 2379th Rd
E26
50th
Rd
Lasa
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d
Broo
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ldD
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N 1475th Rd
Mine Rd
E26
09th
Rd
N 2375th Rd
Sylv
anA
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Lane
St
Elizabeth St
Forrest Rd
N 1475th Rd
N 15th Rd
N 2350th Rd
N 15th Rd
N 22nd Rd
N 16th Rd
E20
thR
d
E19
thR
d
E28
thR
d
E25
thR
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E21
stR
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E23
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Rd
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LegendPhase I
Phase II
Phase III
Local Streets
Township Boundary
County Boundary
Agriculture
Open Areas
Developed
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LaSalle County, Illinois
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Figure 3
Grand Ridge Wind Farm Project (Phase I, II, and III)
Storm Water Pollution Prevention Plan 9 October 2008
Figure 4Soils
Ransom
Grand Ridge Brookfield32N 5EGrand Rapids32N 4E
Allen31N 5EOtter Creek31N 4E
32N 3E
31N 3E
33N 4E 33N 5E33N 3E 33N 6E
Vienna32N 6E
Highland31N 6E
N 19th Rd
N 20th Rd
N 18th Rd
E18
thR
d
N 23rd Rd
E24
thR
d
N 16th Rd
E21
stR
d
E23
rdR
d
N 15th Rd
N 24th Rd
E20
thR
d
W26
thR
dE
26th
Rd
E28
thR
d
E25
thR
d
E29
thR
d
N 2350th Rd
E19
thR
d
N 22nd Rd
N 2379th Rd
E26
50th
Rd
Lasa
lleR
d
Broo
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ldD
r
N 1475th Rd
Mine Rd
E26
09th
Rd
E 2850th Rd
N 2375th Rd
Sylv
anA
ve
Lane
St
Forrest Rd
N 1475th Rd
N 15th Rd
N 2350th Rd
N 15th Rd
N 22nd Rd
E23
rdR
d
N 16th Rd
E20
thR
d
E19
thR
d
E28
thR
d
E25
thR
d
E21
stR
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E19
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E26
50th
Rd
850000.000000
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Soil Associations
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Phase II
Phase III
Local Streets
County Boundary
Township Boundary
Soil Association
Catlin-Flanagan-Drummer
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Grand RidgePhase I, II & III
LaSalle County, Illinois
Figure 4
Grand Ridge Wind Farm Project (Phase I, II, and III)
Storm Water Pollution Prevention Plan 10 October 2008
5.0 CONSTRUCTION ACTIVITIESThe Contractor shall schedule and conduct all operations to minimize the exposure of soils toerosion and provide means to trap sediments leaving the site. Installation of temporary controlmeasures that shall contribute to the control of erosion and prevention of sediment leaving thesite shall be carried out prior to and concurrently with construction activities.
The SWPPP provides structural and non-structural activity-specific erosion and sediment controlBMPs. Erosion and sediment control BMPs selected for each activity are based upon expectedconstruction conditions and methods. The SWPPP can be modified in accordance with actualconditions encountered in the field (Appendix C).
5.1. ACCESS ROAD
Grading of access roads represents the largest land-disturbing activity of the Project. Erosionand sediment controls for the road construction include, but are not limited to, the following:
• Culvert protection
• Mulching
• Preservation of existing vegetation
• Seeding
• Silt fences
The erosion and sediment controls for access road construction are dependent upon adjacent landuse, overland slope, watershed area, and drainage patterns. Silt fence shall be used on thedownstream or downslope side of disturbed areas to minimize the transport of sediment ladenstorm water from project-related activities. Preserved existing vegetation or biorolls can besubstituted for silt fence based on site evaluation by a qualified person.
5.2. WIND TURBINE FOUNDATIONS
Construction of the turbine sites consists of stripping of topsoil and excavation for foundationslabs. Excavation will remove approximately 512 cubic yards of material per turbine site forwhich 332 cubic yards will be used as backfill. The Contractor is required to thin spread thesurplus excavated material within the easement so as to blend with the natural contours of theland. Erosion and sediment controls for this construction include, but are not limited to, thefollowing:
• Mulching
• Preservation of existing vegetation
• Seeding
• Silt Fences
Grand Ridge Wind Farm Project (Phase I, II, and III)
Storm Water Pollution Prevention Plan 11 October 2008
5.3. TRENCHING OF UNDERGROUND ELECTRICAL AND COMMUNICATION CABLES
Electrical and communication cables will be placed underground using a trenching machine.Erosion and sediment controls for the trenching and other areas disturbed by the installation ofunderground electrical cables include, but are not limited to, the following:
• Mulching
• Preservation of existing vegetation
• Seeding
• Silt fences
5.4. CONSTRUCTION OF FACILITIES – OPERATION AND MAINTENANCE FACILITY
Construction of the operation and maintenance facility will involve the stripping of topsoil andexcavation of additional material for the construction of foundations. Erosion and sedimentcontrols for this phase of the construction shall include, but are not limited to, the following:
• Mulching
• Preservation of existing vegetation• Seeding• Silt fences• Temporary sediment trap
5.5. CONSTRUCTION OF FACILITIES – SUBSTATION
Construction of the substation will involve the stripping of topsoil and excavation of additionalmaterial for the construction of foundations. Erosion and sediment controls for the substationshall include, but are not limited to, the following:
• Mulching• Preservation of existing vegetation• Seeding• Silt fences• Temporary sediment trap
5.6. DEWATERING (IF NEEDED)During trenching operation and other construction related activities, dewatering may be required.If dewatering is required, the Contractor shall not discharge sediment laden water directly intosurface water or into a drainage pipe or ditch that flow directly to a surface water. TheContractor shall construct a sediment trap (Appendix D) to settle out sediment before thedischarged water enters surface waters.
Grand Ridge Wind Farm Project (Phase I, II, and III)
Storm Water Pollution Prevention Plan 12 October 2008
6.0 TEMPORARY EROSION AND SEDIMENT CONTROL BMPSA sequence for installation of erosion and sediment control BMPs, stabilization activities, andmaintenance shall be prepared by the Contractor and included into the SWPPP. Generalprinciples in developing the sequence of activities include, but are not limited to, the following:
• Install downslope and sideslope perimeter controls before land disturbing activity occurs.
• Do not disturb an area until it is necessary for construction to proceed.
• Cover or stabilize disturbed areas as soon as possible.
• Time construction activities to limit impact from seasonal climate changes or weatherevents.
• Do not remove temporary perimeter controls until all upstream areas reach finalstabilization.
Temporary controls for construction activities include the following:
• Control of surface water
• Culvert protection
• Ditch protection
• Mulching
• Preserve existing vegetation
• Sediment trap
• Silt fence
• Slope protection
• Street cleaning
• Temporary seeding
• Topsoil segregation and stockpile protection area
The structural BMPs shall be installed as recommended on Figure 5 and specified in AppendixD). The qualified person2 on site can modify recommendations for the field as he or she deemsnecessary.
2 Qualified Person refers to a person knowledgeable in the principles and practice of erosion and sediment controlsuch as a licensed engineer or other knowledgeable person who possesses the skills to assess conditions at theconstruction site that impact storm water quality and to assess the effectiveness of any sediment and erosion controlmeasures selected to control the quality of storm water discharges from the construction activities.
Grand Ridge Wind Farm Project (Phase I, II, and III)
Storm Water Pollution Prevention Plan 13 October 2008
6.1. CONTROL OF SURFACE WATER
Control of surface water may be necessary during the project. Surface water may need to bediverted around or through the construction by earthen berms or trenches. Water collected inexcavation areas throughout the project site may be removed using pumps. Discharge fromdewatering operations must be treated in a sediment trap (Appendix D).
6.2. CULVERT PROTECTION
Refer to Section 7.1, Riprap.
6.3. DITCH PROTECTION
At a minimum, the last 200 feet of ditch shall have temporary or permanent stabilizationmeasures in place within 24 hours of direct connection to surface water. Ditches shall be kept ina rough, graded but smooth condition in order to properly install erosion control seeding, mulch,mats, and blankets. Stabilization methods for ditch bottom wetted perimeters will include one ofthe following, or combinations of, erosion control blankets, mats, riprap, biorolls, or rock checkdams. The method chosen will be based on an analysis of the tractive forces on the lining. Ditchgrades between 3 and 5 percent will require rock checks or category four erosion control blanketand biorolls, to be determined based on flow velocities. Where ditch grades exceed 5 percent,type seven rock check dams, or equivalent bmp, shall be installed. Check dams will be spaced sothat the crest of the downstream dam is at the elevation of the toe of the upstream dam. Abovethe wetted perimeter, the ditch will be stabilized by seeding and mulch and/or erosion controlblankets, depending on side slope steepness and length.
6.4. MULCH
Mulch materials shall be spread uniformly by hand or machine. When spreading straw mulch by
hand, divide the area to be mulched into approximately 1,000 sq. ft. sections and place
approximately 90 lbs. of straw in each section to facilitate uniform distribution.
Straw mulch shall be anchored immediately after spreading to prevent wind blow. One of the
following methods of anchoring straw shall be used:
a. Mulch Anchoring Tool - This is a tractor-drawn implement (mulch crimper, serrated
straight disk, or dull farm disk) designed to punch mulch approximately 2 inches into the
soil surface. This method provides maximum erosion control with straw. It is limited to
use on slopes no steeper than 3:1, where equipment can operate safely. Machinery shall
be operated on the contour.
b. Liquid Mulch Binders - Application of liquid mulch binders and tackifiers should be
heaviest at edges of areas and at crests of ridges and banks, to prevent wind blow. The
Grand Ridge Wind Farm Project (Phase I, II, and III)
Storm Water Pollution Prevention Plan 14 October 2008
remainder of the area should have binder applied uniformly. Binders (asphalt,
synthetic/chemical or wood fiber) may be applied after mulch is spread; however, it is
recommended that it is sprayed into the mulch as it is being blown onto the soil.
Applying straw and binder together is the most effective method.
c. Mulch Nettings - Lightweight, degradable, plastic, polyester, or paper nets may be
stapled over the mulch according to manufacturer's recommendations. When mulching is
done in late fall or during June, July, and August, or where soil is highly erodible, nets
should only be used in conjunction with an organic mulch such as straw
6.5. PRESERVE EXISTING VEGETATION
The Contractor shall preserve existing natural vegetation. Natural vegetation provides a bufferzone and stabilized area which helps control erosion, protect water quality, and enhance aestheticbenefits. This also minimizes the amount of exposed bare soil.
6.6. SEDIMENT TRAPS
Sediment-laden discharge from dewatering operations shall be directed to constructed temporarysediment trap (Appendix D). The sediment trap volume must be at least 1,800 cubic feet peracre of the contributing area. The Contractor shall consider the use of silt fence or hale bales totrap sediment if space is not available within the property boundaries.
6.7. SILT FENCE
Silt fence shall be installed around staging areas and stockpiles/waste area, on the downstreamside of fill slopes as needed, and to protect trees from damage. Silt fence shall be either machinesliced into the soil or installed by hand. Hand-installed silt fence shall have the edge buried orweighted by sand bags (Appendix D).
6.8. SLOPE PROTECTION
There will be no unbroken slope lengths greater than 75 feet for slopes with a grade of 3:1 orsteeper. All exposed areas with a continuous positive slope within 200 feet of surface water willhave a temporary or permanent cover year round. Planned slopes of 3:1 or steeper and greaterthan 75 feet in length will be temporarily or permanently stabilized in increments not to exceed75 feet, prior to constructing or disturbing a new increment. Long slopes shall be broken intoshorter lengths by installing silt fence in J-hooks along the contour or by installing biorolls ininterlocking herringbones. If temporary seeding and mulch cannot be used on slopes steeperthan 3:1, then the slope shall be covered with tarps or plastic sheeting. The solo surface on re-vegetated slopes will be roughened using any appropriate implement that can be safely operatedon the slope, such as bulldozers or disks. The grooves will be created perpendicular to the slopeto help establish vegetative cover, reduce runoff velocity, increase infiltration, and provide for
Grand Ridge Wind Farm Project (Phase I, II, and III)
Storm Water Pollution Prevention Plan 15 October 2008
sediment trapping. Staged seeding and mulching of slopes shall be done as fill is raised and thelower slope becomes inactive.
6.9. STREET CLEANING
Cleaning tracked sediments and debris from paved streets, as needed, prevents unwantedmaterial from being washed into surface waters, and improves the appearance of publicroadways. The Contractor shall inspect paved roadways in front of construction entrances/exitsat the end of each day and tracked soil shall be removed.
6.10. TEMPORARY CONSTRUCTION ENTRANCES/EXITS
To prevent tracking sediments onto paved surfaces, construction entrances shall be constructedby overlaying geotextile fabric with a 6-inch of class V (5). Vegetation and topsoil shall not beremoved from the shoulder zones to construct the entrances, but tall vegetation may be mowed.If entrance begins to rut, stabilize by placing a geogrid and additional class V (5) in roadway.
The entrances radius shall be reduced and the area restored to the geometry of a rural countyroad intersection at the end of the project. Areas outside of the permanent roadway shouldermay require re-grading. Compacted soils shall be loosened by ripping or disking, thenre-vegetated and mulched. This should be completed in conjunction with the other projectproposed for this site.
6.11. TEMPORARY SEEDING
When disturbed soils are left exposed or permanent turf establishment is not possible due toseasonal restrictions in pasture, ditch bottoms, side slopes and fill slopes, then apply theappropriate temporary seed mix for the time of year and apply straw mulch. As per therequirements taken from the Illinois Urban Manual3, all exposed areas with a continuous positiveslope within 200 linear feet of surface water must have temporary erosion protection orpermanent cover for exposed soil areas year round.
The Contractor shall apply the following as deemed appropriate for the seeding dates andconstruction activities (Table 1).
Table 1: Seed Mixture
Seeding Dates Species Application Rate
Early Spring – July 1 Oats 90 lbs/ ac
Early Spring – Sept. 30 Cereal Rye 90 lbs/ac
Early Spring – Sept. 30 Wheat 90 lbs/ac
Early Spring – Sept. 30 Perennial Ryegrass 25 lbs/ac
3 Illinois Urban Drainage Manual. Natural Resources Conservation Service Standard Practice
Grand Ridge Wind Farm Project (Phase I, II, and III)
Storm Water Pollution Prevention Plan 16 October 2008
Seed shall be evenly applied with a cyclone seeder, drill, culti-packer seeder, or hydroseeder.
Small grains shall be planted no more than 1 inch deep. Grasses shall be planted no more than
one-half inch deep. Cover broadcast seeds by culti-packing, dragging a harrow, or raking.
Seed Bed Preparation
Prepare seedbed of loose soil to a depth of 3 to 4 inches. If recent tillage or grading operations
have resulted in a loose surface, additional tillage or roughening may not be required except to
breakup large clods. If rainfall caused the surface to become sealed or crusted, loosen it just
prior to seeding by disking, raking, harrowing, or other suitable methods. Groove or furrow
slopes steeper than 3:1 on the contour before seeding.
Where the pH of the soil is below 5.5, apply one-and-one-half to 2 tons per acre of finely ground
agricultural limestone. If the seeding period is less than 30 days, liming will not be required.
Apply 500 pounds per acre of 10-10-10 fertilizer or equivalent. Incorporate lime and fertilizer
into the top 2 to 4 inches of soil. If the seeding period is less than 30 days, fertilizer will not be
required.
6.12. TOPSOIL SEGREGATION AND STOCKPILE PROTECTION AREA
The Contractor shall explore the project area to determine if sufficient surface soil of goodquality exists to justify stripping. Stripping of topsoil from areas where it will later be reappliedis not recommended if bedrock or other root limiting layer is within a depth of 20 inches.Topsoil shall be free of debris, trash, stumps, rocks, and noxious weeds, and shall give evidenceof being able to support healthy vegetation. It shall contain no substance that is potentially toxicto plant growth.
It is envisioned that some of the excavated materials shall be suitable for backfill and siterestoration. Topsoils and organic soils stripped prior to excavation shall be stockpiled separatelyfrom materials suitable for backfill or access road embankment. Unsuitable material shall bepromptly removed from the site or stockpiled until removal is possible. Silt fence shall beinstalled around the entire perimeter of segregated topsoil areas and waste area stockpile locationto prevent sediment for leaving the designation location. These areas shall be determined by theContractor and protected as defined herein.
Soil stockpiles shall be stabilized or protected with sediment trapping measures such as practicestandards silt fence or temporary seeding. Perimeter controls shall be placed around thestockpile immediately; seeding of stockpiles shall be completed within 7 days of formation of thestockpile if it is to remain dormant for longer than 30 days.
Grand Ridge Wind Farm Project (Phase I, II, and III)
Storm Water Pollution Prevention Plan 17 October 2008
Figure 5Erosion Control Plan – Phase II
33N 4E
Grand Rapids32N 4E
Brookfield32N 5E
33N 5E
99
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Grand RidgePhase II & III
LaSalle County, Illinois
Grand Ridge Phase II & IIIProject Area Location
L A S A L L EL A S A L L E
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K E N D A L LK E N D A L L
P U T N A MP U T N A M
K A N K A K EK A N K A K E
I R O Q UI R O Q U
L E EL E EFigure 5
Grand Ridge Wind Farm Project (Phase I, II, and III)
Storm Water Pollution Prevention Plan 18 October 2008
Figure 6Erosion Control Plan – Phase III
Ransom
Allen31N 5E
Otter Creek31N 4E
Brookfield32N 5E
Grand Rapids32N 4E
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Roosevelt St
Campbell St
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Phase III
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Temporary Meterological Tower
Turbine
Access Roads
Collection System
Township Boundary
Dewatering location
Potential culvert
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Grand RidgePhase II & III
LaSalle County, Illinois
Grand Ridge Phase II & IIIProject Area Location
L A S A L L EL A S A L L E
WIL
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GR
UN
DY
GR
UN
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K E N D A L LK E N D A L L
P U T N A MP U T N A M
K A N K A K EK A N K A K E
I R O Q UI R O Q U
L E EL E EFigure 6
Grand Ridge Wind Farm Project (Phase I, II, and III)
Storm Water Pollution Prevention Plan 19 October 2008
7.0 PERMANENT EROSION AND SEDIMENT CONTROL BMPSPermanent erosion control reestablishes vegetative cover with native or adapted speciesappropriate to the geographic region and includes any structural modifications needed to ensurelong term sustainability. Permanent BMPs include, clean out sediment from the channels,sedimentation basin, and ditches. Flush outlet pipes clean. Remove any unneeded temporaryBMPs within the construction area that shall interfere with permanent BMPs, except perimetersilt fences and as directed by the Engineer/Contractor/Erosion Inspector.
Permanent controls for construction activities shall consist of the following:
• Riprap
• Turf establishment
7.1. RIPRAP
Riprap shall be placed at culvert outlets to meet local jurisdictional requirements (Appendix D).
7.2. TURF ESTABLISHMENT
When land disturbing activities are completed permanent, turf establishment shall then becompleted. Permanent seeding, as noted in the Illinois Urban Manual4 Table A (Code 88),includes oats and perennial ryegrass at seeding rates of 30 to 50 lbs/acre and 10 to 30 lbs/acre,respectively, based upon Pure Live Seed. These are the most practical options for permanentvegetation as they have also been identified for temporary cover.
All seeds shall have the proper stratification and/or scarification to break seed dormancy for
spring or early summer plantings. No treatments are needed for late summer, early fall, or
dormant seeding.
Seeding
Seeding may be done by any of the following methods:
1. Conventional Drill
a. Apply seed uniformly at a depth of quarter-to-half-inch with a drill (band seed) or
cultipacker seeder. On sloping land, seeding operations should be on the contour
wherever possible.
b. Apply mulch or erosion blanket following seeding as required.
2. Broadcast Seeding
a. Culti-pack or roll seedbed, then apply seed uniformly and cover to a quarter-to-
half-inch depth with a cultipacker, or similar tool. Spinning disc type
4Illinois Urban Drainage Manual. Natural Resources Conservation Service Standard Practice
Grand Ridge Wind Farm Project (Phase I, II, and III)
Storm Water Pollution Prevention Plan 20 October 2008
broadcasters equipped with an agitator are effective with native seed mixes.
Often broadcasters require the use of a carrying agent such as oats or vermiculite.
Attention should be given to seed mixes with seeds of varying size and weight so
that the seed remains effectively mixed during seeding operations.
b. On sloping land, dragging, harrowing, or culti-packing should be done on the
contour to ensure seed-soil contact and reduce erosion.
c. Apply mulch or erosion blanket following seeding as required.
3. Hydroseeding
a. For areas to be hydroseeded, final seedbed preparation shall leave the soil surface
in a slightly roughened condition.
b. Lime and fertilizer shall be incorporated prior to seeding unless they are to be
applied at the same time as the seed (applying lime with a hydroseeder may be
abrasive to the equipment). Do not use hydrated lime in a slurry mix.
c. A minimum of 1,000 gallons of water/acre shall be used. The hydraulic seeding
equipment shall include a pump rated and operated at no less than 100 gallons/
minute and at no less than 100 pounds/sq. in. pressure. The tank shall have a
mechanical agitator powerful enough to keep all materials in a uniform
suspension in the water. Calibration of the hydraulic equipment shall be accurate.
d. If seed and fertilizer are mixed together they should be seeded within two hours of
mixing.
4. Dormant Seeding
Dormant seeding may be done between November 15 and March 15 by using
conventional drill or broadcast methods.
If soil conditions are suitable during the dormant seeding period, prepare the
seedbed and seed as indicated in this specification. Apply mulch or erosion
blanket following seeding.
5. No-till
In some instances it may be desirable to sow seed into existing sod, a temporary
cover crop, or natural vegetation. Drilling may be done after herbicide
application to non-native sod or undesirable weeds such as Canada thistle. A
rangeland type grass drill with a no-till attachment shall be used. Seeds should be
drilled to the depth appropriate for the species, according to the supplier’s
recommendations.
Grand Ridge Wind Farm Project (Phase I, II, and III)
Storm Water Pollution Prevention Plan 21 October 2008
The seeds of some plants require light-to-stimulate germination and growth. In
situations with some of these species, particularly some native forbs, a
combination of broadcasting and no-till drilling may be used. Grasses should be
drilled first, followed by broadcasting of the desired forbs.
Seedbed preparation
Prior to seeding or planting, the seedbed shall be relatively free of all weeds (greater than 80
percent weed free), stones, roots, sticks, rivulets, gullies, crusting, and caking, or other debris
which may interfere with seeding or planting operations or plant establishment. The seedbed
shall not be worked when frozen or saturated. Prior to seeding or planting the surface shall be
disked or raked to a depth of 2 to 3 inches either by hand or mechanical means to create a
smooth, uniform seedbed.
If needed, based upon soil conditions and desired vegetation type, incorporate the lime and
fertilizer into the soil with a disk harrow, springtooth harrow, or similar tool, to a depth of at
least 3 inches. On sloping areas, the final operation shall be on the contour.
Fertilizer or lime is generally not recommended for native vegetation establishment unless soil
tests indicate a pH less than 5.5, Phosphorus less than 15 lbs/ac or Potassium less than 150
lbs/ac. If levels are below this, apply lime and fertilizer according to a soil test and the needs of
the vegetation selected. In areas that have not been regraded, which have grown up in weeds, or
to be no-till seeded, an herbicide application may be necessary to reduce competition with the
desired vegetation. An approved herbicide may be used to treat such areas to kill all existing
vegetation. Herbicide application shall be done at least 15 days prior to seeding or planting.
Mulching/Erosion Blanket
All permanent seeding application shall be mulched upon completion of seed application or
planting. Erosion blanket should be substituted for mulch on steep slopes (10 percent slope or
greater) or wherever highly erosive conditions exist (e.g. in drainage swales or waterbody
shorelines). When planting ground covers, it may be advantageous to apply mulch or erosion
blanket prior to planting. Plants should then be tucked into the soil through slits or holes. In all
cases, planting should be done in a staggered pattern to minimize erosion.
Maintenance
The Contractor shall inspect all planted areas for failures and make necessary repairs,
replacements, reseedings, and re-mulching within the planting season, if possible. If a stand has
less than 70 percent ground cover, reevaluate the choice of plant materials, quantities of lime and
Grand Ridge Wind Farm Project (Phase I, II, and III)
Storm Water Pollution Prevention Plan 22 October 2008
fertilizer, seeding or planting methods, time of seeding or planting, and available light and
moisture. Reestablish the stand with modifications based on the evaluation.
Grand Ridge Wind Farm Project (Phase I, II, and III)
Storm Water Pollution Prevention Plan 23 October 2008
8.0 INSPECTION AND MAINTENANCE
8.1. INSPECTION
Periodic inspections should be conducted of temporary and permanent erosion and sedimentcontrols by a qualified person at least once every seven calendar days, within 24 hours of rainfallevents that produce more than 0.5 inches of rain in a 24-hour period or greater, or an equivalentsnowmelt event. Records shall be kept for each inspection and maintenance activity and shallcontain the following information:
• Date and time of inspection
• Name of person(s) conducting inspection
• Findings of inspections, including recommendations for corrective action
• Corrective actions taken, including dates, time, and party completing maintenanceactivities
• Date and amount of all precipitation events that produce more than 0.5 inches of rain orequivalent snow in a 24-hour period or greater
• Document changes to SWPPP
An Inspection Log is provided in Appendix E.
If modifications are required as noted by the qualified person after site inspections, thosemodifications must be implemented within seven calendar days following the inspection. If thesite is in violation of the SWPPP, an Incident of Noncompliance must be completed and submitwithin five calendar days to IEPA (Appendix F):
Illinois Environmental Protection AgencyDivision of Water Pollution Control
Compliance Assurance Section1021 North Grand Avenue East
Post Office Box 19276Springfield, Illinois 62794-9276
8.2. MAINTENANCE
It is the Contractor’s responsibility to maintain silt fences and other temporary erosion andsediment controls in working order throughout the project and make repairs as needed.Maintenance shall include the following:
• Sediment trap shall be at 50 percent capacity.
• Excess sediment behind silt fences and biorolls shall be removed and properly disposedwhen sediments reach one-third the height of the structure.
Grand Ridge Wind Farm Project (Phase I, II, and III)
Storm Water Pollution Prevention Plan 24 October 2008
• Tracked sediments will be removed from paved surfaces at the end of each day.
• Construction entrances shall be maintained daily.
• Temporary and permanent vegetation.
All remaining temporary BMPs and accumulated sediments from silt fences shall be removed30 days after site has undergone final stabilization.
Grand Ridge Wind Farm Project (Phase I, II, and III)
Storm Water Pollution Prevention Plan 25 October 2008
9.0 POLLUTION PREVENTION MANAGEMENT MEASURES
9.1. SPILLS CLEAN
Clean up petroleum spills promptly by placing contaminated soils in a drum(s) for properdisposal off-site.
9.2. TRASH AND DEBRIS
The Contractor shall keep the work site clean. Do not bury trash and debris within fill orbackfill. Collect construction and demolition debris, debris from clearing and grubbing, trash,and other waste at least weekly for disposal off-site. No on-site burning is permitted. Contractorshall comply with federal, state, and local requirements for the disposal of solid waste.
9.3. HAZARDOUS MATERIALS
Oils, fuels, and any hazardous substances must be properly stored, including secondarycontainment for tanks larger than 55 gallons, to prevent spills. Restricted access to storage areasmust be provided to prevent vandalism. Storage and disposal of hazardous materials must be incompliance with federal, state, and local regulations.
9.4. TRUCK WASHING
If required, a location shall be set aside for washing concrete trucks. Discharge from the washshall be directed into a sediment trap, which shall also receive waste concrete. The trap shall becleaned out at least weekly and the material disposed off-site.
9.5. DUST CONTROL
The Contractor shall take measures to prevent fugitive dust during the work. This may requireperiodic wetting of exposed soils and engineered fills until soils are stabilized and pavement isinstalled.
Grand Ridge Wind Farm Project (Phase I, II, and III)
Storm Water Pollution Prevention Plan 26 October 2008
10.0 PLAN MODIFICATIONS
The SWPPP must accurately reflect the site features and operations. If the Owner or Contractorobserves that the plan is not effective in minimizing pollutant discharge from the site, then theSWPPP must be updated or changed (Appendix C). Also, the plan shall be updated to includecontractors and subcontractors identified after the submittal of the NOI, as they are required tocertify the SWPPP.
Grand Ridge Wind Farm Project (Phase I, II, and III)
Storm Water Pollution Prevention Plan 27 October 2008
11.0 NOTICE OF TERMINATION
The Owner is required to submit a Notice of Termination (NOT) to the IEPA after one ormore of the following conditions have been met:
1. Final stabilization has been achieved on all portions of the site for which theOwner is responsible; or
2. All storm water discharge from construction activities authorized by this permit iseliminated.
A copy of the NOT can be found in Appendix G.
Grand Ridge Wind Farm Project (Phase I, II, and III)
Storm Water Pollution Prevention Plan 28 October 2008
12.0 RECORD RETENTIONThe Owner shall retain copies of the SWPPP and all reports and notices required by thepermit for a period of at least three (3) years from the date the permit is terminated.
Grand Ridge Wind Farm Project (Phase I, II, and III)
Storm Water Pollution Prevention Plan Appendix A October 2008
Appendix A : IEPA General Construction Permit –ILR10
Grand Ridge Wind Farm Project (Phase I, II, and III)
Storm Water Pollution Prevention Plan Appendix B October 2008
Appendix B: Drainage Study
Drainage Study Grand Ridge Wind Energy Project
September 2007 Updated September 2008
Prepared by:
30 N. LaSalle St. Chicago, IL 60602
Grand Ridge Wind Energy Project Drainage Study
HDR Engineering, Inc. Certification
CERTIFICATION
This certification documents that this “Drainage Study – Grand Ridge Wind Energy
Project,” prepared by Melcy Curth Pond, a licensed professional engineer in the State of
Illinois, demonstrates that no substantial increases in runoff or change in drainage
patterns are anticipated as a result of construction of the project.
Grand Ridge Wind Energy Project Drainage Study
HDR Engineering, Inc. 1
Background
The purpose of this drainage study is to determine the impacts of constructing, wind
turbines, adjacent access roads, and other related facilities on the existing drainage
system in an area in eastern LaSalle County, Illinois, as shown in Figure 1. A
comparison of the peak flows estimated for existing and proposed conditions will be used
to quantify the potential impacts of the proposed
improvements. In addition, a comparison of existing and
proposed drainage patterns will be used to demonstrate
potential impacts on the system.
Approach
The impacts of the proposed construction on drainage
were investigated using the following approach.
The project area was divided into 17 subbasins, as shown
in Figure 2. These subbasins were screened for potential
impacts on drainage based on the number of proposed
turbine sites in the subbasin, the length of proposed access roads, and the existing
hydrologic characteristics. Subbasin M was selected for the initial analysis based on this
criteria.
The National Resources Conservation Service Technical Release 55 - Urban Hydrology
for Small Watersheds (TR-55) graphical peak discharge method was selected for the
hydrologic analysis of the subbasin. TR-55 provides an approach to estimating peak
flows while accounting for slope, soils, and watershed shape for areas up to 2000 acres.
This methodology is accepted by the Illinois Department of Natural Resources – Office
of Water Resources and other regulatory agencies for determining peak flows. Two
analyses were performed, one for existing conditions and one for proposed conditions.
ProjectLocationProjectLocation
Figure 1 - Location Map
Grand Ridge Wind Energy Project Drainage Study
HDR Engineering, Inc. 2
Figure 2 - Project Site Drainage Subbasin Delineation
Grand Ridge Wind Energy Project Drainage Study
HDR Engineering, Inc. 3
Analysis
Descriptions of the parameters developed for use in the TR-55 analysis are presented in
the following paragraphs. The values determined for subbasin M are included.
Topography and slope are used to characterize the subbasin. This information was
obtained from detailed topographic mapping, shown in Figure 3 with proposed
improvement locations in Subbasin M.
Hydrologic Soil Groups classify soils according to their minimum infiltration rate. Soils
have been categorized into one of four groups. Based on the soils associations shown on
Figure 4 and with verification for Subbasin M from the LaSalle County Soil Survey, a
hydrologic soil group C was determined.
Figure 3 – Subbasin M Topography and Delineation
Grand Ridge Wind Energy Project Drainage Study
HDR Engineering, Inc. 4
Land use defines the ground cover needed to calculate runoff. Subbasin M was divided
into 5 land uses – cropland, other farmland, home sites, non-agricultural, permanent
pasture and road right-of-way. These areas were measured and used in the runoff curve
number calculations included in Appendix A.
SubbasinSubbasin
Figure 4 –Soils Map
Grand Ridge Wind Energy Project Drainage Study
HDR Engineering, Inc. 5
Time of concentration ( Tc ) is the time for runoff to travel from the hydraulically most
distant point of the watershed to the outlet. Factors which affect the time of
concentration include surface roughness, channel shape and flow patterns, and slope.
Aerial photographs, shown in Figure 5, are used in this analysis. Calculations are
included in Appendix A.
Runoff curve number (CN) is an index combining hydrologic soil group and land use
factors (cover and condition). The major factors that determine CN are the hydrologic
soil group (HSG), cover type, treatment, hydrologic condition, and antecedent runoff
condition. Calculations are included in Appendix A.
Rainfall depths in inches are obtained from Bulletin 70 - Frequency Distributions of
Heavy Rainstorms in Illinois. For LaSalle County, these amounts are 4.47 inches for the
10-year, 24-hour and 7.58 inches for the 100-year 24-hour storm event. A Type II
rainfall distribution was assumed for both existing and proposed conditions. Rainfall
data is shown in Appendix A.
Figure 5 - Aerial Photo of Subbasin M
Grand Ridge Wind Energy Project Drainage Study
HDR Engineering, Inc. 6
Conservative, “worst-case” values were determined for these parameters in the context of
the data provided. For example, values for slopes were rounded up (steeper) and lower
coefficients for surface roughness were chosen to show the maximum potential change.
Results
Table 1 summarizes the parameters used for the existing and proposed conditions
hydrologic analyses and the resulting peak flows calculated. The area impacted by the
construction of the facilities is small compared to the total subbasin area (16 of the 1,457
acres), so the changes in surface roughness, channel shape, flow patterns and slope for
proposed conditions have minimal impact on the subbasin flows.
Condition Rainfall Frequency
Drainage Area, acres
Hydrologic Soil Group
Tc, minutes
Runoff Curve Number
Peak Flows, cfs
10-yr 1,457 C 2.00 80 1,238 Existing
100-yr 1,457 C 1.98 81 2,678
10-yr 1,457 C 2.00 80 1,290 Proposed
100-yr 1,457 C 1.98 81 2,740
Table 1- Hydrologic Analysis Parameter and Results
Table 1 shows the peak flows values calculated. The increases in peak flows from
existing conditions to proposed conditions are 52 cfs (4%) for the 10-year storm and 62
cfs (2.3%) for the 100-year storm. These differences are well within the margin of error
for this methodology and are not significant.
The data developed for this subbasin can be used to determine the impact of the proposed
development on other subbasins in the project area. Since the parameters affecting the
flow rate calculation are similar throughout the area, and the proposed changes are of
similar magnitude, it can be concluded that similar differences in peak flows would be
calculated in the other subbasins.
Grand Ridge Wind Energy Project Drainage Study
HDR Engineering, Inc. 7
Conclusion
Based on the analysis performed for existing and proposed conditions using a
conservative approach in developing method parameters, the maximum peak flow
increases resulting from construction of the turbines and access roads are less than 6%
and are not significant when compared to the accuracy of the method used. Also,
because the facilities are generally located at or near ridges and construction will disturb
a small area, the impact on drainage patterns will be insignificant.
Care should be taken during construction to minimize the impacts on the drainage
system. Stormwater best management practices should be used on the project site as
outlined in the Storm Water Pollution Prevention Plan to control erosion, minimize the
discharge of sediment-laden runoff, and maintain drainage system capacity.
Grand Ridge Wind Energy Project Drainage Study
HDR Engineering, Inc. Update
September 2008 Update
An expansion of the Grand Ridge Wind Energy project has been proposed. This
expansion will construct two additional phases of the project. The locations of subbasins
in all phases are shown in Figure 2a below.
Figure 2a - Project Site Drainage Subbasin Delineation
The total areas for Phases II and III were compared to the increase in impervious area
resulting from construction of the energy facilities. For Phase II, the percent increase in
impervious area will be 0.3% (12.2-acre increase for the 4,020-acre Phase II area). For
Phase III, the percent increase in impervious area will be 0.36% (36.9-acre increase for
Grand Ridge Wind Energy Project Drainage Study
HDR Engineering, Inc. Update
the 10,211-acre Phase III area). These increases are less than the 1.0% increase
calculated for Phase I (16-acre increase for the 1,457-acre Phase I area).
The data developed for Phase I can be used to determine the impact of the proposed
Phases II and III. Since the parameters affecting the flow rate calculation are similar
throughout the area, and the proposed changes are of similar magnitude, it can be
concluded that similar differences in peak flows would be calculated in adjacent
subbasins in Phases II and III. These peak flow increases and impacts on drainage
patterns will be insignificant.
CERTIFICATION
This certification documents that this update to the “Drainage Study – Grand Ridge
Wind Energy Project,” prepared by Melcy Curth Pond, a licensed professional engineer
in the State of Illinois, demonstrates that no substantial increases in runoff or change in
drainage patterns are anticipated as a result of construction of the project.
Grand Ridge Wind Energy Project Drainage Study
HDR Engineering, Inc. A-1
Appendix A
Bulletin 70 Rainfall Data
Existing Conditions TR-55 Worksheets
Proposed Conditions Tr-55 Worksheets
Grand Ridge Wind Energy Project Drainage Study
HDR Engineering, Inc. A-2
Bulletin 70 Rainfall Data
Source - Huff, F. A., and J. R. Angel, 1989. Rainfall Distributions and Hydroclimatic Characteristics of Heavy Rainstorms in Illinois, (Bulletin 70), Illinois State Water
Sectional Mean Frequency Distributions for Storm Periods of 5 Minutes to 10 Days and Recurrence Intervals of 1 to 100 Years in Illinois.
Amounts are in inches.
Section Duration 1-year 2-year 5-year 10-year 25-year 50-year 100-year
02 10-day 4.12 4.95 6.04 6.89 8.18 9.38 11.14 02 5-day 3.25 3.93 4.91 5.70 6.93 8.04 9.96 02 72-hr 2.93 3.55 4.44 5.18 6.32 7.41 8.78 02 48-hr 2.70 3.30 4.09 4.81 5.88 6.84 8.16 02 24-hr 2.51 3.04 3.80 4.47 5.51 6.46 7.58 02 18-hr 2.30 2.79 3.50 4.11 5.06 5.95 6.97 02 12-hr 2.18 2.64 3.31 3.89 4.79 5.62 6.59 02 6-hr 1.88 2.28 2.85 3.35 4.13 4.85 5.68 02 3-hr 1.60 1.94 2.43 2.86 3.53 4.14 4.85 02 2-hr 1.48 1.79 2.24 2.64 3.25 3.82 4.47 02 1-hr 1.18 1.43 1.79 2.10 2.59 3.04 3.56 02 30-min 0.93 1.12 1.41 1.65 2.04 2.39 2.80 02 15-min 0.68 0.82 1.03 1.21 1.49 1.75 2.05 02 10-min 0.55 0.67 0.84 0.98 1.21 1.42 1.67 02 5-min 0.30 0.36 0.46 0.54 0.66 0.78 0.91
Grand Ridge Wind Energy Project Drainage Study
HDR Engineering, Inc. A-3
Runoff Curve Number Worksheet – Existing Conditions
Grand Ridge Wind Energy Project Drainage Study
HDR Engineering, Inc. A-4
Time of Concentration Worksheet – Existing Conditions
Grand Ridge Wind Energy Project Drainage Study
HDR Engineering, Inc. A-5
Peak Discharge Worksheet – Existing Conditions
Grand Ridge Wind Energy Project Drainage Study
HDR Engineering, Inc. A-6
Runoff Curve Number Worksheet – Proposed Conditions
Grand Ridge Wind Energy Project Drainage Study
HDR Engineering, Inc. A-7
Time of Concentration Worksheet – Proposed Conditions
Grand Ridge Wind Energy Project Drainage Study
HDR Engineering, Inc. A-8
Peak Discharge Worksheet – Proposed Conditions
Grand Ridge Wind Farm Project (Phase I, II, and III)
Storm Water Pollution Prevention Plan Appendix C October 2008
Appendix C: Revision Documentation
Revision Date Comments
00 September 2007 Original
01 August 2008Revised SWPPP to incorporate Phase IIand Phase III
02 October 2008 Final draft.
Grand Ridge Wind Farm Project (Phase I, II, and III)
Storm Water Pollution Prevention Plan Appendix D October 2008
Appendix D: Erosion Control Details
Check Dams SE ... 4
-f--------,--r="'"',- -!-J4-
ELEVATION
---------r ~
LO
~~~~~~~~~~~~~~~.,-
Flow ....
8" to 12"diameter rock
TYPICAL ROCK CHECK DAM SECTIOI\J
ROCK CHECK DAMNOT TO SCALE
1'0
o x....... 0
-1--'2'+-
~\.'\.~~~~~~"'-- ....---l LO,-
GRAVEL BAG CHECK DAM ELEVATIONNOT TO SCALE
January 2003 Califomia Stormwater BMP HandbookConstruction
www.cabmphandbooks.com
5 of 5
Earth Dikes and Drainage Swales EC ... 9
line
Stabilizing cover,when needed.24"
II2: 1 (H: V) slopeor flatter
TYPICAL DRAINAGE SWALENOT TO SCALE
Compacted fill
NOTES:
1. Stabilize inlet, outlets and slopes.
2. Properly compact the subgrade.
Compacted fill
Stabilizing cover,when needed
line
TYPICAL EARTH DIKENOT TO SCALE
January 2003 California Stormwater BMP HandbookConstruction
www.cabmphandbooks.com
7 of 7
NOTES:1. Slope surface shall be free of rocks, clods, sticks
and gross. Mats/blankets shall have good soil contact.
2. Loy blankets loosely and stake or staple to maintaindirect contact with the soil. Do not stretch.
3. Install per manufacturer's recommendations
EC ... 7
2"3"
I,ISOMETRIC VIEW
Geotextiles and Mats
6" X 6~
anchor trench
WET SLOPE LININGNTS
10 of 11
TYPICAL INSTALLATION DETAIL
CaliFornia Storrnwater BMPHandbookConstruction
www.cabmphandbooks.com
January 2003
(
Geotextiles and Mats EC ... 7
intervals
ISOMETRIC VIEWNTS
4" X 4"anchor shoe
6"
INTERMITTENT CHECK SLOTNTS
LONGITUDINAL ANCHOR TRENCHNTS
January 2003
NOTES:1. Check slots to be constructed per manufacturers specifications.2. Staking or stapling layout per manufacturers specifications.3. Install per manufacturer's recommendations
TYPICAL INSTALLATION DETAIL
California storrrwater BMP HandbookConstruction
www.cabmphandbooks.com
11 of 11
SE ... 3 Sediment Tra~
NOTE:Size spillway to conveypeak design flow.
TYPICAL OPEN SPILLWAY
Outlet pipe or usealternative open
Earth embankmen t
Outlet protection
All slopesl:3 (V: H)or flatter
,':.
5'-0" Min~
Watertight connection
Excavate, if necessaryfor storage
Flow
li~". Min
Perforate riser
6 of 6
EMBANKMENT SECTION THRU RISER
TYPICAL SEDIMENT TRAPNOT TO SCALE
Califomia Stormwater BMP HandbookConstruction
www.cabmphandbooks.com
January 2003
tn
tnITtI
.....J.
.....-C""t'
."CD:1oCD
See note 10
LEGEND
Tamped backfill
Slope direction
Direction of fiow
Fabric
Silt fence
~
Toe of slope
~
SECTlm~ C-C
CROSS BARRIER DETAIL!
Optional main tenanceopening detail
SILT FENCE
-{ II Fabric
J8l--I<
/
-J Crass barrier.
~
/
1. Construct the lenglh of each reach so that the change In boseelevation along the reach does nat exceed 1/3 the height of the linearbarrier, In no case sholl the reach length exceed 500',
2. The lost 8'- 0" of fence sholl be turned up slope.
3. Stoke dimensions are nominal.
5. Stokes shall be spaced at 8'-0· maximum and sholl bepositioned on downstream aide of fence.
4. Dimension may vary to fit field condition.
5. Stokes to overtop and fence fabric to fold around each stokeone full turn. Secure fabric to stoke with 4 staples.
7. Stokes shall be driven tightly together to prevent potentialflow-through of sediment at joint. The tops of the stokessholl be secured with wire.
8. For end stoke, fence fabric sholl be folded around two stakesone full tum and secured with 4 staples.
g. Minimum 4 staples per stoke. Dimensions shown are typical.
10. Cross barriers sholl be a minimum of 1/3 and a maximum of 1/2 theheight of the linear barrier.
11. Maintenance openings shall be constructed in a manner to ensuresediment remains behind silt fence.
12.. Joining sactlona sholl not be placed at sump locations.
13. Sandbag rows and layers sholl be offset to eliminate gaps.
NOTES
Cross barrier(See nole 10)
.....Q,CO
'Ol~COl
.:<Noow
()Ol
i§i:Jiii'
o (f)
s 0 Q3 0 ~-o1;J:::r q OlOl C ~:J o CDg:~. ;8 s s:A "til
I8 Ol~3 0-cr00A
(l)
g,co
(J)rr1I
....,},
(J)......-t""I'."CD::J(")
CD
Slake
Fabric
LEGEND
Tamped backfillSlope directionDlrectlan of flow
STAPLE DETAIL
(SEE NOTE 9)
~
~-'
.4 ~1/18"' --:]]-:Tdlameler ~~
~~
~
'Toe of slope-----"-'-;IL.;--,\-,----£/ _
OPTIONAL MAINTENAtJCE OPENING DETAIL(SEE NOTE 11)
12)
Slit fence
END DETAIL
Fabric ,a' _ ~'{."' 2"(~. """.~ (~. ".(:~ .",.
END STAKE DETAIL (TOP VIEW)
JOINING SECTION DETAIL (TOP VIEW)
Slake 8
Fabric section A(See notes S, 7 &. 12)
rEnd stokeI~ (Sec note 2)
.ke
'0..,
..,
See detail A
DETAIL A
SECTION A-A
-(h-, 2" X 2"
SUi fence.~ Vwood etcfabric <,
"~. ",. . ~,. .~"
'"
I 5"
-L.t'-
Slope
Noow
1if:JC(\)
.:<
n~
~~:30;'
0 (flIll n aCT 0 -,
:3:J ~"DUl::Tq (\)III C ,.,.:J <1 CDCl. .... -,CT -, CO
8 s s" -0Ul
:r:8 III
:J:3 o,
CT00
"
....-....
Stabilized Construction Entrance/Exit TC-1
Crushed aggregate greater than 3"{but smaller than 6"
J i,,~ilter fobf.ic .
~~~~~Ol12 " Min, unless otherwisespecified by a soils engineer
SECTION B-BNTS
>«3o«~I
ow>«0..
o~If(J)
xw
MatchExistingGrode
NOTE:Construct sediment barrierand channelize runoff tosediment trapping device
cui vert
50' Min
or four times the circumferenceof the largest construction vehicle tire,
whichever is greater
PLANNTS
Width osrequired toaccomodateanticipatedtraffic
January 2003 CaliFornia Stormwater BMP Handbook 5 of 6Construction
www.cabmphandbooks.com
Stabilized Construction Entrance/Exit TC-1
Crushed aggregate greater than 3"but smaller than 6·.
OrigInal
---.L~~/1.2(:i&!:tl:.~Q'&~~IQC~~J---=.:.-grqde12" Min, unless otherwisespecified by a soils engineer
Crushed aggregate greater than 3·but smaller than 6".
Corrugated steel panels
12" Min, unless otherwisespecified by a soils engineer
SECTION A-ANOT TO SCALE
Filter fabric
or four times the circumferenceof the largest construction vehicle tire,
whichever is greater
NOTE:Construct sediment barrierand channelize runoff tosediment trapping device
<,,
>-'«)3:10'«I0,0::,
0 1
~i«'o..!0!~If-'tfJlxiw,
I,
MatchExistingGrade
6 of 6
Sediment trappingdevice
..du'+,'.-101
1I
Corrugated steel panelsA B
?4' min
50' min
PLANNTS
California Stormvvater BMP HandbookConstruction
www.cabmphandbooks.com
January 2003
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EC ... 10_______V.....e.....l__o__c.....it...:llY;;.....""D.....i__s.....s......Iipation Devices
Pipe outlet to welldefined channel
4do (min)
A
PLAN VIEW
Key in 6"-9"recommended forentire perimeter
SECTION A-A
For largeror higher flows consult a RegisteredCivilEngineerSource:USDA-SCS
Pipe Diameter Discharge Apron Length, La Rip Rap 050 Diameter
inches ft3 / s fl:Min
inches
5 10 412
10 13 6
10 10 6
20 16 818
30 23 12
40 26 16
30 16 8
40 26 824
50 26 12
60 30 16..
(4 of 4 California Stormwater BMPHandbook
Constructionwww.cabmphandbooks.com
January 2003
Grand Ridge Wind Farm Project (Phase I, II, and III)
Storm Water Pollution Prevention Plan Appendix E October 2008
Appendix E: Inspection Log
Initialsof
Inspector
Typeof
Inspection
Dateof
Inspection
Timeof
Inspection
Areas to be Inspected*
Comments:Routine w
ee
kly
24 h
ours
after
a r
ain
eve
nt
Month
Day
Year
Insig
nific
ant ra
infa
ll, n
oin
spection n
eeded.
AM
PM
All
ero
sio
n a
nd
sedim
ent contr
ol B
MP
Te
mpora
ryS
edim
enta
tion
basin
s
Dra
inage d
itches a
nd
oth
er
wate
rs o
f th
e s
tate
Constr
uction s
ite
exits
Inspectors should enter their initials, type, date, and time of theinspection in the blanks provided. After inspecting each shadedarea*, inspectors should check each box, and make any necessarycomments regarding their findings in the blanks provided below andon the back of this sheet.
* Refer to the Grand Ridge Wind Farm Project SWPPP for guidance during inspection of these areas at the construction site.
Inspecto
rs L
og for
IEP
AN
PD
ES
Constr
uction P
erm
it
Initialsof
Inspector
Typeof
Inspection
Dateof
Inspection
Timeof
Inspection
Additional comments:Ro
utin
e w
ee
kly
24 h
ours
aft
er
a r
ain
event
Mon
th
Day
Ye
ar
AM
PM
Grand Ridge Wind Farm Project (Phase I, II, and III)
Storm Water Pollution Prevention Plan Appendix F October 2008
Appendix F: Incidence of Noncompliance
Information required by this form must be provided to comply with 415 ILCS 5/39(1996). Failure to do so may prevent this form from being processed and could result in your application being denied. This form has been approved by the Forms Management Center. IL 532 2105 WPC 624 Rev. 6/98)
ILLINOIS ENVIRONMENTAL PROTECTION AGENCY CONSTRUCTION SITE STORM WATER DISCHARGE
INCIDENCE OF NON-COMPLIANCE (ION)
PERMITTEE NAME:
LAST FIRST MIDDLE INITIAL AREA CODE +
PHONE NUMBER:
STREET: CITY:
ST:
ZIP:
CONSTRUCTION SITE NAME:
COUNTY: SECTION:
TOWNSHIP:
RANGE:
NPDES PERMIT NUMBER: I L R 1 0
LATITUDE:
DEG.
MIN.
SEC.
LONGITUDE: DEG.
MIN.
SEC.
CAUSE OF NON-COMPLIANCE:
ACTIONS TAKEN TO PREVENT ANY FURTHER NON-COMPLIANCE:
ENVIRONMENTAL IMPACT RESULTING FROM THE NON-COMPLIANCE:
ACTIONS TAKEN TO REDUCE THE ENVIRONMENTAL IMPACT RESULTING FROM THE NON-COMPLIANCE:
SIGNATURE: ____________________________________________ TITLE: DATE:
FOR OFFICE USE ONLY
LOG:
PERMIT NO. ILR10___ ___ ___ ___
MAIL COMPLETED FORM TO: ILLINOIS ENVIRONMENTAL PROTECTION AGENCY DIVISION OF WATER POLLUTION CONTROL (DO NOT SUBMIT ADDITIONAL COMPLIANCE ASSURANCE SECTION #19 DOCUMENTATION POST OFFICE BOX 19276 UNLESS REQUESTED) SPRINGFIELD, ILLINOIS 62794-9276 DATE:
Grand Ridge Wind Farm Project (Phase I, II, and III)
Storm Water Pollution Prevention Plan Appendix G October 2008
Appendix G: Notice of Termination
ILLINOIS ENVIRONMENTAL PROTECTION AGENCY NOTICE OF TERMINATION (NOT) OF COVERAGE UNDER THE GENERAL PERMIT
FOR STORM WATER DISCHARGES ASSOCIATED WITH CONSTRUCTION SITE ACTIVITIES
Please use the tab or arrow keys OWNER INFORMATION
NAME: LAST FIRST MIDDLE
OWNER TYPE:
MAILING ADDRESS:
CITY: STATE: ZIP:
CONTACT PERSON: TELEPHONE
NUMBER: AREA CODE
NUMBER
CONTRACTOR INFORMATION NAME:
LAST FIRST MIDDLE
TELEPHONE NUMBER:
AREA CODE
NUMBER
MAILING ADDRESS: CITY: STATE: ZIP:
CONSTRUCTION SITE INFORMATION FACILITY NAME: OTHER NPDES PERMIT NOS.: I L R 1 0
FACILITY LOCATION:
CITY: STATE: IL ZIP: LATITUDE: LONGITUDE:
COUNTY: SECTION: TOWNSHIP: RANGE:
DATE PROJECT HAS BEEN COMPLETED AND STABILIZED: I certify under penalty of law that disturbed soils at the identified facility have been finally stabilized or that all storm water discharges
associated with industrial activity from the identified facility that are authorized by an NPDES general permit have otherwise been eliminated. I understand that by submitting this notice of termination, that I am no longer authorized to discharge storm water associated with industrial activity by the general permit, and that discharging pollutants in storm water associated with industrial activity to Waters of the State is unlawful under the Environmental Protection Act and the Clean Water Act where the discharge is not authorized by an NPDES permit.
OWNER SIGNATURE: ______ DATE: ___________________________________________ FOR OFFICE USE ONLY
LOG:
PERMIT NO. ILR10 ___ ___ ___ ___
MAIL COMPLETED FORM TO: (DO NOT SUBMIT ADDITIONAL DOCUMENTATION UNLESS REQUESTED)
ILLINOIS ENVIRONMENTAL PROTECTION AGENCY DIVISION OF WATER POLLUTION CONTROL ATTN: PERMIT SECTION POST OFFICE BOX 19276 SPRINGFIELD, ILLINOIS 62794-9276 DATE:
Information required by this form must be provided to comply with 415 ILCS 5/39 (1996). Failure to do so may prevent this form from being processed and could result in your application being denied. This form has been approved by the Forms Management Center. IL 532 2102 WPC 621 Rev. 1/04