HomeMy WebLinkAboutC406 - SWPP INFORMATIONCrA Crosby silt loam, 0 to 3 percent slopes
This is a somewhat poorly drained soil with a seasonal high water table at 0.5 to 2.0 ft. This soil
is located on rises on till plains; slopes are 0 to 3 percent. The native vegetation is hardwood
forest. The surface layer is silt loam and has moderately low to moderate organic matter
content (1.0 to 3.0 percent). Permeability is very slow (<0.06 in/hr) in the most restrictive layer
above 60 inches. Available water capacity is moderate (6.2 inches in the upper 60 inches).
The pH of the surface layer in non-limed areas is 5.1 to 6.5. Droughtiness and wetness are
management concerns for crops production. This soil responds well to tile drainage; it is
designated potentially highly erodible (class 2) in the Highly Erodible Land (HEL) classification
system.
Br Brookston silty clay loam
This nearly level soil is in depressions, on flats, and in narrow drainageways between better
drained soils on broad, undulation plains. Slopes are 0 to 2 percent. In some small areas, this
soil has a silt loam or clay loam surface layer. Runoff is very slow. Wetness is the main
limitation. Because of wetness, the soil has severe limitations for nonfarm uses. Most areas
are cultivated. A few are wooded. Wooded areas support fair stands of hardwoods, but some
are heavily pastured. Permeability is moderate (0.6 to 2 in/hr) in the most restrictive layer above
60 inches. Available water capacity is high (12 inches in the upper 60 inches). The pH of the
surface layer in non-limed areas is 6.6 to 7.3.
MmB2 Miami silt loam, 2 to 6 percent slopes, eroded
This is a moderately well drained soil with a seasonal water table at 2.0 to 3.5 ft. This soil
is located rises on till plains; slopes are 2 to 6 percent. The native vegetation is hardwood
forest. The surface layer is silt loam and has moderately low organic matter content (1.0 to 2.0
percent). Permeability is very slow (<0.06 in/hr) in the most restrictive layer above 60 inches.
Available water capacity is moderate (6.1 inches in the upper 60 inches). The pH of the surface
layer in non-limed areas is 5.1 to 6.5. Droughtiness and water erosion are management
concerns for crop production. This soil is designated potential highly erodible (class 2) in the
Highly Erodible Land (HEL) classification system.
SECTION B
Stormwater Pollution Prevention Plan
Construction Components
The construction component of the SWPPP includes stormwater quality measures to address
erosion, sedimentation, and other pollutants associated with land disturbance and construction
activities. Proper implementation of the plan and inspections of the construction site are
necessary to minimize the discharge pollutants. The project Site Owner should be aware that
unforeseen construction activities and weather conditions may affect the performance of a
practice or the effectiveness of the plan. The plan must be a flexible document, with provisions
to modify or substitute practices as necessary.
B1 Description of potential pollutants sources associates with the construction activities:
Silt and sediment from exposed soils, leaves, mulch, vehicular sources such as leaking fuel
or oil, brake fluid, brake dust, trash, and debris, biological agents found in trash, fertilizers,
herbicides, pesticides, acid rain, lime dust and concrete washout.
B2 Sequencing of storm water quality implementation relative to land disturbance activities:
This plan has been created in an effort to eliminate or reduce sediment from leaving the
Project during construction while protecting the adjoining properties and the offsite storm
sewer system. If measures specified in these plans are implemented the chance that
sediment will leaving the site will be reduced.
Pre-Construction Activities:
1. Schedule Pre-Con with City of Carmel Engineering Department before commencing
work.
2. Call the Indiana Underground Plant Protection Systems, Inc. ("Holey Moley") at
1-800-382-5544 to check the location of any existing utilities. They should be notified
two working days before construction takes place
3. Install silt fencing at the edges of the project site as indicated on plans. Preservation of
existing grass strips upstream and downstream of silt fencing greatly reduces sediment
transport offsite.
4. Maintain a 10' minimum grass filter strip along the site perimeter adjacent to public
streets wherever possible.
5. Install inlet protection measures at all existing inlets as shown on the plans
6. A construction entrance shall be placed per the plan location.
Project Information:
Project Name: Clay Center Road Elementary
Address: Clay Center Road, Carmel, Indiana 46032
County: Hamilton
Civil Township: Clay Quarter: SW Section: 34 Township: 18-N Range: 3-E
Latitude: 39°57'43''N Longitude: 86°10'40''W
Project Location: 11905 Clay Center Road, Carmel, Indiana 46032
Project Site Owner and Contact Information:
Company Name (if applicable): Carmel Clay Schools
Name (Individual): Ron Farrand Jr., RA
Position: Director of Facilities and Transportation
Address: 5201 East 131st Street
City: Carmel State: IN Zip: 46033
Phone: (317) - 815 - 3962
Project Narrative:
New Elementary School with parking spaces, bus loading / unloading area, playgrounds and
baseball fields. Storm Water utilities needed for operation of the development are also included
with this project.
SECTION A
Storm Water Pollution Prevention Plan Elements
Assessment of Construction Plan Elements for Technical Review and Comment
This section is to address technical review and comments of the Construction/Stormwater
Pollution Prevention Plan for the Project.
A1 Plan Index Provided on this sheet
A2 11 x 17 Plat boundaries: The Plat boundaries for this property are included as Sheets 1
and 2 of the ALTA survey included with this plan set.
A3 Project Narrative:
This school project will be built on existing agricultural land. The proposed 106,400 S.F.
building footprint will be constructed along with 148 parking spaces, , 17 bus parking
spaces, and vehicle/bus maneuvering drives. Several play areas and four baseball
diamonds are also included in this project.
A4 Vicinity Map: Denoted on Sheet C-100
A5 Legal description of project site: The legal description is on Sheet 3 of the survey.
A6 Location of all proposed site improvements: Denoted on Sheets: and C-501-C504
A7 14 Digit Hydrologic Code:05120201090060
A8 State or Federal Water Quality Permits: None
A9 In the pre-developed condition, storm runoff flows southeast across the site to a storm
sewer system that discharges to Ames Run, a tributary to Williams Creek. In post
construction conditions, runoff will continue to drain southeast via storm sewer pipes to a
new wet detention pond at the SE property corner that discharges into the same existing
storm sewer system that discharges into Ames Run.
A10 Location of all wetlands, lakes & water courses on and adjacent to site: See Topograhic
Survey Sheets 1, 2 & 3.
A11 Receiving Waters: Ames Run, a tributary to Williams Creek.
A12 Identification of potential discharges to groundwater: Excavation pits can be potential
sources of discharge into groundwater. There is a potential for discharges into
groundwater from sediment resulting from exposed soils, leaves, mulch, and vehicular
sources if a significant ain event occurs while excavations are open.
A13 100 Year Floodplains, Floodways and Flood Fringes: None
A14 Pre-Construction and Post-Construction Peak Discharge
10 year Pre-Construction Peak Discharge = 55.95
10 year Post-Construction Peak Discharge = 31.17
A15 Adjacent Land Use: See Plan Sheet C406 for more detail
North:PUD, Residential
South: S-1, Residential
East: PUD, Residential
West: S-1, Residential
A16 Locations and approximate boundaries of all disturbed areas: See Plan Sheet C-401,
C-403.
A17 Identification of existing vegetative cover: See Topographic Survey Plan Sheets 1 & 2.
A18 Soils Map including descriptions and limitations: See Plan Sheet C-406 for soils map,
descriptions and limitations.
A19 Locations, size and dimensions of proposed storm water systems:
See Plan Sheets C-501-C504 for proposed storm sewer system
A20 Locations, size and dimensions of any proposed off-site construction activities
associates with this project: NONE.
A21 Locations of Soil Stockpiles: See Sheet C401 & C402.
A22 Existing site topography: See Topographic Survey Plan Sheets 1 & 2, and C-101 for
existing site topography
A23 Proposed final topography: See Plan Sheet C-301 - C-304 for proposed site grading and
drainage patterns
A24 Name, Contact Info, and Qualifications of the individual in charge of SWPPP
implementation.
Trained Individual Responsible for SWPPP Inspections:
Company Name: Carmel Clay Schools
Contact Person: Ron Farrand Jr., RA
Title/Position: Director of Facilities and Transportation
Address: 5201 East 131st Street
City: Carmel State: IN Zip: 46033
Phone: (317)815-3962
BMP - Wet Pond with Native Banks
Monthly Inspection Maintenance
Undesirable vegetative growth:
Remove undesirable vegetation along pond banks including but not limited to tree seedlings, cattails, etc.
Remove Floatable debris and visible pollution:
Remove any floatable debris if present.
Inspect pond and banks for erosion, failure, etc.:
Fill and repair any rills or eroded areas from concentrated sheet flow runoff. Repair any eroded soils around outlet and inlet
structures. Reseed all disturbed areas and areas of insufficient vegetative cover.
Inspect and note sediment. Remove when measurements indicate removal is required:
Note and measure the sediment in the pond bottom relative to the indicated minimum depth listed in the post construction
Operation and Maintenance Manual. Remove sediment when pond depth reaches minimum allowed.
Remove debris at storm inlets, outlets, Headwalls, endwalls and spillways:
Remove all trash. Leaves and debris.
Complaints from residents:
Note and address any complaints from residents.
Public Hazards:
Note and address any current or potential Public Hazards.
Annually and after major storms Inspection Maintenance
Vegetation:
Remove undesirable vegetation along pond banks including but not limited to tree seedlings, cat-tails, etc. Mow as necessary.
Erosion on embankment:
Fill and repair any rills or eroded areas from concentrated sheet flow runoff. Repair any eroded soils around outlet and inlet
structures. Reseed all disturbed areas and areas of insufficient vegetative cover.
Animal Burrows:
If present, obtain services of pest control or other company to have animals removed.
Cracking, bulging or sliding of dam:
Inspect pond and forebay banks for erosion, failure, leaks, seeps or slope protection failure. If failures are present obtain the
services of a Licensed Professional Civil or Geotechnical Engineer for soil repair recommendations.
All Drains clear and functioning:
Inspect all inlet drains and remove any silt or debris as necessary.
Outlet Structure:
Inspect and check the Low Flow orifice for blockage, Trash rack for debris and corrosion. Excessive buildup, cracks, spalding
and repair as necessary
SECTION C
Stormwater Pollution Prevention Plan
Post Construction Component
The post construction component of the SWPPP includes the implementation of storm water
quality measures to address pollutants that will be associated with the final land use. Post
construction storm water quality measures should be functional upon completion of the project.
Long term functionality of the measures are critical to their performance and should be monitored
and maintained.
List of Water Quality units:
1. Aqua-Swirl AS-10.
2. Wet pond with native banks.
C1 Description of pollutants and their sources associated with the proposed and use:
Silt and sediment from expose soils, leaves, mulch, vehicular sources such as leaking fuel
or oil, brake fluid, brake dust, grease, antifreeze, metals, rubber fragments, road grit, salts
and sands, construction trash and debris, fertilizers, household items including but not
limited to cleaning agents, chemicals, paint, miscellaneous home improvement materials,
toys, clothing and animal waste, elevated storm runoff temperatures, acid rains, pesticides
and pathogens.
C2 Sequence describing storm water quality measure implementation:
1. Inspect and maintain all erosion control measures as detailed in the Storm Water
Pollution Prevention Measures Maintenance Requirement beginning immediately
after installation and continuing until vegetation has been sufficiently established
and all construction activities completed.
2. Remove all individual inlet protection, coir fiber log check dams, silt fences, etc. only
after seeding/sodding and sufficient vegetative growth has been established in each area to
a point where sediment/pollutants will not enter the detention basin or storm sewer system.
3. Inspection and maintenance of all common area and infrastructure improvements
is the responsibility of the owner/developer or his designee until improvements are
accepted for maintenance by local agencies.
C3 Description of proposed post-construction storm water quality measures:
Site and facility design for storm water quality protection on this site employs a multi-level
strategy consisting of:
1. Controlling sources of pollutants.
2. Filtering Runoff through a hydrodynamic filter then a wet water quality detention basin.
3. Permanent erosion control seeding/sodding and plantings.
C4 Location, dimensions, specifications and construction details of storm water quality
measures. The hydronamic filter is located NW of the wet detention basin. The detention
basin is located at the SE propserty corner.
C5 Description of maintenance guidelines for proposed water quality measures:
LOCATION MAP
SOILS MAP
ELEMENT DESCRIPTION SHEET
A1 INDEX
A2 11x17 EXHIBIT
A3 NARRATIVE
A4 VICINITY MAP
A5 LEGAL DESCRIPTION PG. 3 OF SURVEY
A6 IMPROVEMENTS C-201 & C-301
A7 HYDROLOGIC CODE C-406
A8 STATE OR FEDERAL PERMITS NONE
A9 STORM WATER DISCHARGE POINTS
A10 WETLANDS, LAKES, AND WATER COURSES
A11 RECEIVING WATERS SURVEY PG.'s 1&2, C-406
A12 DISCHARGE TO GROUND WATER
A13 FLOODPLAIN, FLOOD WAYS, & FLOODWAY FRINGE NONE
A14 PEAK DISCHARGES
A15 ADJACENT LAND USE
A16 CONSTRUCTION LIMITS C-401,C-402
A17 EXISTING VEGETATIVE COVER
A18 SOILS
A19 PROPOSED STORM WATER SYSTEMS
A20 OFFSITE ACTIVITIES
A21 SOIL BORROW OR STOCKPILES
A22 EXISTING TOPOGRAPHY
A23 FINAL TOPOGRAPHY C301-C304
B1 POTENTIAL POLLUTANTS
B2 SEQUENCE DESCRIBING STORMWATER QUALITY
B3 CONSTRUCTION ENTRANCE
B4 SEDIMENT CONTROL FOR SHEET FLOW
B5 SEDIMENT CONTROL FOR CONCENTRATED FLOW
B6 SEDIMENT CONTROL FOR SEWER INLET PROTECTION
B7 RUNOFF CONTROL MEASURES
B8 STORMWATER OUTLET PROTECTION
B9 GRADE CONTROL STRUCTURE NONE
B10 DETAILS FOR EACH STORM WATER QUALITY MEASURE
B11 TEMPORARY STABILIZATION METHODS
B12 PERMANENT STABILIZATION
B13 MATERIAL HANDLING AND SPILL PREVENTION
B14 MONITORING & MAINTENANCE GUIDELINES
B15 EROSION & SEDIMENT FOR INDIVIDUAL LOTS N/A
C1 POLLUTANTS & SOURCES ASSOCIATED WITH LAND USE
C2 SEQUENCE FOR STORM WATER QUALITY MEASURES
C3 POST CONSTRUCTION STORWATER QUALITY
C4 DETAILS FOR EACH STORM WATER QUALITY MEASURE
C5 DESC. MAINTENANCE FOR POST CONSTRUCTION SWQ MEASURES
SWPPP ELEMENT INDEX
C-406
C501-C504
NONE
C-401,C-402
C-401-C-406
C-405
C-401-C402
C-403
C-406
C-405
C-405
C-406
C-406
C-406
C-406
C-406
NONE
C-100
18095
Project Number:
Drawing Number:
Certified By:
Checked ByDrawn ByIssue Date
Revisions:PROJECT:Scope Drawings:CARMEL, INDIANANEWFORCARMEL CLAY SCHOOLSCARMEL ELEMENTARY SCHOOLSDrawing Title:
06-21-19 SO MK
Rev. #Revision
Description
Issue
Date
1 ADDENDUM 7/9/2019
3 ASI #1 8/28/2019
SECTION C continued:
Stormwater Pollution Prevention Plan
Post Construction Component
BMP - Stormwater Quality Treatment Unit (AQUA-SWIRL, AS-10
Basic Operation
The Storm water Quality Treatment Unit ( SQTU ) is a hydrodynamic separator designed to enhance gravitational separation of
floating and settling materials from storm water flows. Storm water flows enter the unit tangentially to the grit chamber, which
promotes a gentle swirling motion. As polluted water circles within the grit chamber, pollutants migrate toward the center of the
unit where velocities are the lowest. The majority of settleable solids are left behind as storm water exits the grit chamber
through two apertures on the perimeter of the chamber. Next, buoyant debris and oil and grease are separated from water
flowing under the baffle wall due to their relatively low specific gravity. As storm water exits the System through the flow
control wall and ultimately through the outlet pipe, it is relatively free of floating and settling pollutants.
Over time a conical pile tends to accumulate in the center of the unit containing sediment and associated metals, nutrients,
hydrocarbons and other pollutants. Floating debris and oil and grease form a floating layer trapped in front of the baffle wall.
Accumulation of these pollutants can easily be assessed through access manholes over each chamber. Maintenance is
typically performed through the manhole over the grit chamber.
Inspection of SQTU
SQTU should be inspected at regular intervals and maintained when necessary to ensure optimum performance. The rate at
which the System collects pollutants will depend more heavily on site activities than the size of the unit, e.g., unstable soils or
heavy winter sanding will cause the grit chamber to fill more quickly but regular sweeping will slow accumulation.
Inspection is the key to effective maintenance and is easily performed. Quarterly inspections of the accumulated sediment.
Pollutant deposition and transport may vary from year to year and quarterly inspections will help insure that Systems are
cleaned out at the appropriate time. Inspections should be performed more often in the winter months in climates where
sanding operations may lead to rapid accumulations, or in equipment wash down areas. It is very useful to keep a record of
each inspection.
The SQTU system should be cleaned when inspection reveals that the sediment depth has accumulated to the determined
elevation or depth. This determination can be made by taking 2 measurements with a stadia rod or similar measuring device.
Cleaning of SQTU Structures
Maintaining the SQTU is easiest when there is no flow entering the Systems. For this reason, it is a good idea to schedule the
clean out during dry weather. Clean out of the SQTU with a vacuum truck is generally the most effective and convenient
method of excavating pollutants from the System. If such a truck is not available, a "clamshell" grab may be used, but it is
difficult to remove all accumulated pollutants with such devices.
Oil or gasoline spills should be cleaned out immediately. Motor oil and other hydrocarbons that accumulate on a more routine
basis should be removed when an appreciable layer has been captured. To remove these pollutants, it may be preferable to
use adsorbent pads since they are usually cheaper to dispose of than the oil water emulsion that may be created by
vacuuming the oily layer. Trash can be netted out if you wish to separate it from the other pollutants.
Accumulated sediment is typically evacuated through the manhole over the grit chamber. Simply remove the cover and insert
the vacuum hose into the grit chamber. As water is evacuated, the water level outside of the grit chamber will drop to the
same level as the crest of the lower aperture of the grit chamber. It will not drop below this level due to the fact that the bottom
and sides of the grit chamber are sealed to the tank floor and walls. This "Water Lock" feature prevents water from migrating
into the grit chamber, exposing the bottom of the baffle wall. Floating pollutants will decant into the grit chamber as the water
level there is drawn down. This allows most floating material to be withdrawn from the same access point above the grit
chamber.
If maintenance is not performed as recommended, sediment may accumulate outside the grit chamber. If this is the case, it
may be necessary to pump out all chambers. It is a good idea to check for accumulation in all chambers during each
maintenance event to prevent sediment build up there.
Manhole covers should be securely seated following cleaning activities, to ensure that surface runoff does not leak into the unit
from above.
After a storm event, treated runoff is decanted out of the SQTU at a controlled rate, restoring the water level to a low
dry-weather volume. This reveals a conical pile of accumulated sediment in the center of the grit chamber. Besides facilitating
inspection and cleaning through the unobstructed access, the low water level significantly reduces maintenance costs by
decreasing pump-out volume.
Note: As the generator, the landowner is ultimately responsible for the proper disposal of material
removed from water quality treatment structures.
Quarterly inspections of the SQTU shall include observation of the accumulated sediment. Pollutant deposition and
transport may vary from year to year and quarterly inspections will help insure that the systems are cleaned out at the
appropriate time. Inspections should be performed more often in the winter months in climates where sanding operations
may lead to rapid accumulations, or in equipment wash down areas.
C-406
PG. 1-2 OF SURVEY
PG. 1-2 OF SURVEY
C501-C504
PG. 1-2 OF SURVEY
C-401-C-403
SECTION B - continued
Stormwater Pollution Prevention Plan
Construction Components
Construction Activities
B1 For reference & sequencing see sheets C401 & C402.
B2 Stable construction entrance location(s) and specifications: See Plan Sheet C-401 -
C402.
B3 Sediment control measures for sheet flow areas: See Plan Sheet C-401, 402.
B4 Sediment control measures for concentrated flow areas: C-401, 402.
B5 Storm sewer inlet protection measures, locations and specifications:
See Plan Sheets C-401, 402.
B6 Runoff control measures: See Plan Sheets C-401, 402.
B7 Storm water outlet protection specifications: See Plan Sheets C401-C403.
B8 Grade control structure locations and specifications: None.
B9 Location, dimensions, specifications and construction details of each storm water quality
measure: See Plan Sheet C404-C406.
B10 Temporary Surface stabilization methods appropriate for each season: See Plan
Sheets C401-C402.
B11 Permanent surface stabilization specifications.
See Plan Sheet C-406.
B12 Material handling and spill prevention plan:
Purpose:
The intention of this Spill Prevention, Control and Countermeasures (PCC) is to
establish the procedures and equipment required to prevent the discharge of oil and
hazardous substances in quantities that violate applicable water quality standards,
cause a sheen upon or discoloration of the surface of Receiving water or adjoining
shorelines, or cause sludge or emulsion to be deposited beneath the surface of the
water or adjoining shorelines. The plan also establishes the activities required to
mitigate such discharges (i.e. countermeasures) should they occur.
Definitions:
Pollutant: Means pollutant of any kind or in any form, including but not limited to
sediment, paint, cleaning agents, concrete washout, pesticides, nutrients, trash,
hydraulic fluids, fuel, oil, petroleum, fuel oil, sludge, oil refuse, and oil mixed with wastes
other than dredged soil.
Discharge: Includes, but is not limited to, any spilling, leaking, pumping, pouring,
emitting, emptying or dumping.
Receiving Navigable Waters: Means all waters of the United States that are connected
with a Receiving stream, lake, or sea. [Note: this definition is usually interpreted to
mean any wastewater even normally dry wash or storm sewer) that eventually drains
into a Receiving stream.
Plan Review Amendments:This plan shall be reviewed and/or amended, if necessary,
whenever there is a change in the design of the site, construction, operation, or
maintenance which materially affects the site's potential for the discharge of regulated
material.
Prediction of Potential Spills:
1. Nearest Receiving Water: Williams Creek
2. Drainage System: In the Pre Developed condition storm runoff flows southeast
across the site to a storm sewer system that discharges to Ames Run, a tributary
to Williams Creek. In post construction conditions, runoff will continue to drain
southeast via storm sewer pipes to a new wet detention pond that will outlet at
the same existing storm sewer system that discharges into Ames Run.
3. Possible spill sources (during and post-construction):
Vehicular sources such as leaking fuel or oil, brake fluid, grease, antifreeze;
construction trash and debris, biological agents found in trash and debris,
fertilizers, household items including but not limited cleaning agents, chemicals,
paint, herbicides and pesticides.
4. Groundwater contamination:
The facility maintains NO above ground oil & separator or underground storage
tanks at this site.
Therefore, it is felt that there is little or no possibility of post-construction
groundwater contamination. The facility does have city sanitary sewer and city
water.
Alert Procedures for Spills:
1. Any personnel observing a spill will immediately initiate the following procedure:
a. Notify the designated emergency coordinator for the project.
2. The Emergency Coordinator will then take the following actions:
a. Barricade the area allowing no vehicles to enter or leave the spill zone.
b. Notify the Indiana Department of Environmental Management, Office of
Emergency Response by calling the appropriate telephone number.
Office 317-233-7745 Toll Free 800-233-7745
Also the National Response Center at 800-424-8802 and provide the following
information:
- Time of observation of the spill
- Location of the spill
- Identity of material spilled
- Probable source of the spill
- Probable time of the spill
- Volume of the spill and duration
- Present and anticipated movement of the spill
- Weather conditions
- Personnel at the scene
- Action initiated by personnel
c. Notify the Carmel Fire Department : Phone 911
d. Notify the Carmel Police Department: Phone 911
e. Notify waste recovery contractor, maintenance personnel or other contractual
personnel as necessary for clean up
f. Coordinate and monitor clean up until the situation has been stabilized and
all spills have been eliminated.
g. Cooperate with the IDEM-OER on procedures and reports involved with
the event.
Cleanup Parameters:
1. The developer shall be continually kept informed, maintain
lists of qualified contractors and available Vac-trucks, tank pumpers and other
equipment readily accessible for clean-up operations. In addition, a continually
updated
list of available absorbent materials and clean up supplies should be kept on site.
2. All maintenance personnel will be made aware of techniques for prevention of spills.
They will be kept abreast of current development or new information on the
prevention
of spills and/or necessary alteration to this plan.
3. When spills occur which could endanger human life and this becomes primary
concern, the discharge of the life saving protection function will be carried out by the
local police and fire departments.
4. Absorbent materials, which are used in cleaning up spilled materials, will be
disposed
of in a manner subject to the approval of the Indiana Department of Environmental
Management.
5. Flushing of spilled material with water will not be permitted unless so authorized by
the Indiana Department of Environmental Management.
C-406
C-406
C406-C603
C-406
C-402, C-403
C-401-C-403
C-401-C-403
C-401, C-402
SECTION B - continued
Stormwater Pollution Prevention Plan
Construction Components
B14 Monitoring and maintenance guidelines for each proposed stormwater quality measure:
Temporary gravel construction entrance maintenance requirements
1. Inspect entrance pad and sediment disposal area weekly and after storm events or
heavy use.
2. Reshape as needed for drainage and runoff control.
3. Top dress with clean stone as needed.
4. Immediately remove mud and sediment tracked or washed onto streets by brushing or
sweeping. Flushing should only be used if the water is conveyed into a sediment trap
of basin.
5. Repair any broken road pavement immediately.
Coir Fiber Log Check Dam maintenance requirements:
1. Inspect coir log check dams after each storm event and promptly remove any sediment
deposits to insure adequate storage volume for the next rain, taking care not to
undermine the entranced bales.
2. Inspect periodically for deterioration or damage from construction activities and repair
immediately.
3. After the contributing drainage area has been stabilized, remove all coir logs and
sediment deposits, bring the disturbed are to grade and stabilize.
SILT FENCE Rock Check Dam Outlet:
1. Inspect check dams and the reinforced silt fence after each storm event, and repair
any damage immediately.
2. If significant erosion occurs downstream from dams, install a riprap liner downstream
from the check dam.
3. Remove sediment accumulated upstream from each dam as needed to maintain storage
capacity, to allow drainage through the dam, and to prevent large flows
from displacing sediment.
4. Add rock to the dams as needed to maintain design height and cross section.
When the dams are no longer needed, remove the rock and stabilize with permanent
seed and erosion control blanket as shown on the plans.
Silt fence maintenance requirements
1. Inspect the silt fence periodically and after each storm event.
2. If fence fabric tears, starts to decompose or in any way becomes ineffective, replace
the affected portion immediately.
3. Remove deposited sediment when it reaches half the height of the fence at its lowest
point or is causing fabric to bulge.
4. Take care to avoid undermining the fence during cleanout.
5. After the contributing drainage area has been stabilized, remove the fence and
sediment deposits, bring the disturbed area to grade and stabilize.
Inlet Protection, and Drop Inlet barrier maintenance requirements.
1. Inspect after each storm event and repair if necessary.
2. Remove sediment, without flushing, when it reaches half the height of barrier.
3. Deposit removed sediment where it will not enter storm sewer drains.
4. Replace or repair if torn or damaged in other ways.
5. When contributing drainage area has been stabilized, remove and properly dispose of
construction material and sediment, finish grade the disturbed area and stabilize.
Erosion control blanket (surface applied) maintenance requirements
1. During vegetative establishment, inspect after each storm event for any erosion below
the blanket.
2. If any area(s) shows erosion, pull back that portion of the blanket covering it, reseed
the area and relay and staple the blanket.
3. After vegetative establishment check the treated area periodically.
Topsoil (Salvage and Utilization):
1. Inspect newly topsoiled areas frequently until vegetation is established
2. Repair eroded or damaged areas and re-vegetate.
B15 Erosion & sediment control specifications for individual building lots: NONE.
All erosion and sediment control measures must be properly maintained throughout
construction. Temporary and permanent seeding should be watered as needed until
established. See Plan Sheets C403-C404.
C406
SWPP
INFORMATION
02/27/20