HomeMy WebLinkAboutC106-C107_SWPPP-C107SITE NAME:
The area scheduled for construction is known as "Rolling Hills Town Homes" (hereinafter referred to as the "Project").
PROJECT LOCATION:
The property is located at the south east corner of 146th street and Rolling Hills Drive in Carmel, Indiana.
05120201090030
Pre-construction 10-year discharge: 1.68 cfs
Post-construction 10-year discharge: 0.11 cfs
The site will discharge to an existing storm sewer system as shown on c103.
The dry pond & underground storage is a potential discharge to ground water.
TEMPORARY AND PERMANENT STORM WATER QUALITY MEASURES
STABLE CONSTRUCTION ENTRANCE LOCATIONS AND SPECIFICATIONS: (B3)
Construction entrances will be in place prior to any site construction or demolition. Entrances are shown on the Erosion Control Plan, refer to the
Erosion Control Details for details.
SEDIMENT CONTROL MEASURES FOR SHEET FLOW AREAS: (B4)
Sheet flow areas will be protected by seed and mulch or hydroseeding. Erosion control blankets will be installed on sloped areas where the slope
exceeds 6:1 (horizontal to vertical). Silt Fence will be installed to prevent sedimentation from leaving the site. Refer to the Erosion Control Plan for
locations and Erosion Control Details for details.
SEDIMENT CONTROL MEASURES FOR CONCENTRATED FLOW AREAS: (B5)
Rip rap outlet protection will be provided for all storm sewer outlets. Rock check dams shall also be installed in the temporary swales to promote
channel stability. Refer to the Erosion Control Plan for locations and Erosion Control Details for details.
STORM SEWER INLET PROTECTION MEASURE LOCATIONS AND SPECIFICATIONS: (B6)
The contractor shall install inlet protection in each inlet in paved areas. Refer to the Erosion Control Plan for locations and refer to Erosion Control
Details for details.
RUNOFF CONTROL MEASURES: (B7)
None needed
STORMWATER OUTLET PROTECTION SPECIFICATIONS: (B8)
Stormwater outlets will be protected by riprap aprons. Refer to the Erosion Control Plan for locations and the Erosion Control Details for details.
GRADE STABILIZATION STRUCTURE LOCATIONS AND SPECIFICATIONS: (B9)
Rip rap aprons at outlets will be utilized to prevent grade destabilization. Refer to Erosion Control Plan for
locations and Erosion Control Details for details.
SEQUENCE DESCRIBING STORMWATER QUALITY MEASURE IMPLEMENTATION: (B2)
·notify swcd agent, local jurisdiction and idem 48 hours in advance of beginning work.
·post a notice of the project in a publicly accessible location near the project field office. The notice will include a copy of the completed noi letter, the
npdes permit number, and name, company name, and telephone number of project contact person.
·all erosion control practices will be installed under the guidance of a professional experienced in erosion control. All other non-engineered erosion
control measures involving vegetation will be installed according to the specifications and criteria as set forth in this erosion control plan.
·erosion control practices will be implemented on all disturbed areas within the project site and maintained in working order by the contractor.
·flag or denote all construction limits as depicted on sheets c104-c105. Areas outside of the construction limits are not to be disturbed.
·call for an underground locate to verify location of existing utilities.
·retain existing vegetation wherever possible.
·identify and protect all existing vegetation designated to remain.
·install erosion control measures and silt fence.
·install construction entrance and provide temporary seeding.
·install temporary seeding in all permissible areas.
·inform all general contractors, construction management firms, grading or excavating contractors, and all other contractors with primary oversight on
individual building lots of the terms and conditions of the storm water rule 5, and the conditions and standards of this erosion control plan, schedule for
implementation, and the construction site erosion control plan report.
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·install storm and sanitary facilities which will consist of 1 pond, infrastructure, and swales.
·install inlet protection
·complete parking lots, roadways and curbs. No lime used as soil treatment is to be stored on site.
· install water utilities.
·final grade and landscape.
·all areas which can be regraded to a final state shall be revegetated with an approved seed
mixture and fertilized at the rates indicated per figure 5-3 on sheet c106.
·after construction and final grading, landscape and permanently stabilize all disturbed sites, including borrow and disposal areas. Also remove temporary
runoff control structures and any unstable sediment around them, and vegetate those areas.
·vertical construction to commence. As determined per contractor's schedule.
background vegetation density. The density of 70% or greater must be maintained to be considered as stabilized. The operator or their representative will
water, fertilize, and reseed disturbed areas as needed to achieve this goal.
Erosion and Sediment Control Inspections:
All controls should be inspected at least once every seven (7) calendar days and following any storm event of 0.5 inch or greater. The following is a list of
inspection/maintenance practices that will be used for specific controls:
1.Geotextiles/Erosion Control Mats: Missing or loose matting must be replaced or re-anchored.
2.Inlet Protection: Sediment should be removed when it reaches approximately one-half the height of the fence. If a sump is used,
sediment should be removed when the volume of the basin is reduced by 50%.
3.Diversion Swales: Clean debris or other obstructions as needed. Damage from storms or normal construction activities (i.e., tire ruts) shall
be repaired immediately.
4.Mulching: Inspect for thin or bare spots caused by natural decomposition or weather-related events. Mulch in high traffic area should be replaced
on a regular basis to maintain uniform protection.
5.Sediment Trap: Accumulated silt shall be removed and the basin shall be regarded to its original dimensions at such point that the capacity of
the impoundment has been reduced to one-half of its original storage capacity. The removed sediment shall be stockpiled or redistributed in areas
that are protected from erosion.
6.Sediment Basin: Inspect frequently to check for damage and to ensure obstructions are not diminishing the effectiveness of the structures.
Sediment shall be removed and the basin shall be regarded to its original dimensions at such point that the capacity of the impoundment has
been reduced to 20% of its original storage capacity. The removed sediment shall be stockpiled or redistributed in areas that are protected from erosion.
7.Silt Fence: Removal of built-up sediment will occur when the sediment reaches one-third the height of the fence.
8.Stabilized Construction Entrance: Periodic regarding and top dressing with additional stones.
9.Straw Bales: Replace straw bales that show signs of deterioration.
10.Vegetation: Protect newly seeded areas from excessive runoff and traffic until vegetation is established. Establish a watering and fertilizing
schedule.
11.Good Housekeeping: Litter, construction debris, and construction chemicals exposed to stormwater shall be prevented from becoming a
pollutant source for stormwater discharges through screening of outfalls and daily pickup of litter.
In the event that sediment escapes the construction site, off-site accumulations of sediment must be removed at a frequency sufficient to minimize
adverse impacts. An example of this may be the situation where sediment has washed into the street and could be carried into the storm sewers by the
next rainfall and/or pose a safety hazard to users of public streets.
Modifications/Revisions to SWPPP:
Based on inspection results, any necessary modification to this SWPPP shall be implemented within seven calendar days of the inspection. A modification
is necessary if a control measure or operational procedure does not provide adequate pollutant control. All revisions shall be recorded on a Record of
Revisions within seven calendar days of the inspection.
It is the responsibility of the operator to maintain effective pollutant discharge controls. Physical site conditions or contractor/subcontractor practices could
make it necessary to install more controls than were originally planned. For example, localized concentrations of surface runoff or unusually steep areas
could require additional silt barrier or other structural controls. Assessing the need for and installing additional controls will be a continuing
contractor/subcontractor responsibility until final stabilization is achieved. Contractors and subcontractors implementing this SWPPP must remain alert to
the need to periodically refine and update this SWPPP in order to accomplish the intended goals.
Notice of Termination:
Compliance of the site with the General Construction Permit remains the responsibility of all operators that have submitted an NOI until such time as they
have submitted a Notice of Termination (NOT). The permittee's authorization to discharge under the General Construction Permit terminates at midnight
of the day the NOT is signed.
All permittee's must submit an NOT within thirty (30) days after one or more of the following conditions have been met:
1.Final stabilization has been achieved on all portions of the site for which the permittee was responsible.
2.Another operator/permittee has assumed control over all areas of the site that have not been finally stabilized.
3.In residential construction operations, temporary stabilization has been completed and the residence has been
transferred to the homeowner.
DESCRIPTION OF PROPOSED POST-CONSTRUCTION STORMWATER QUALITY MEASURES: (C3)
Maintenance requirements for the stormwater quality measures which will remain in place after construction is
complete, are described below. Refer to the BMP Operations and Maintenance Manual for more detailed maintenance
requirements.
Vegetated Swale
Vegetated swales are designed to reduce pollutants and sediment loads in storm water runoff. Storm water runoff is
directed into the swale which conveys the runoff from the site. While moving through the swale, runoff velocity is
greatly decreased allowing biofiltration (uptake of nutrients by plants), infiltration (percolation of water through the
swale's porous soil substrate), and sedimentation (settling out of later suspended particles.)
Permanent Vegetation
Topsoil will be placed in lawn areas and seeded with grass, and graded not to exceed 3:1 slopes. Proposed landscape trees and shrubs will also be
added. These Bio areas will act as a natural filter strip to help improve storm water quality. The vegetated areas will slow the velocities of storm water
runoff, reduce sediment runoff, and reduce problems associated with mud or dust from bare soils.
Underground Detention Pond
An underground detention pond detains storm water runoff long enough for contaminated sediments to settle and remain in
the pond and allow the water in the pond to be displaced by the next rain event. The sedimentation process removes
particulates, organic matter, and metals from the water while nutrients are removed through biological uptake. By
capturing and retaining runoff, wet ponds control both storm water quality and quantity.
Dry Detention Basin
Basins collect, temporarily hold, and gradually release excess storm water from storm events. Detention is achieved
through the use of an outlet structure that regulates the rate of storm water outflow.
Good Housekeeping measures:
Good Housekeeping measures such as regular street sweeping, installation of trash receptacles, and reduction in fertilizer overspray can be incorporated
by the owner and/or occupant.
LOCATION, DIMENSIONS, SPECIFICATIONS, AND CONSTRUCTION DETAILS OF EACH STORMWATER QUALITY MEASURE: (C4)
The following items are stormwater quality measures that will be installed during construction. These items will remain
in place after construction is completed and are considered to serve an incidental function as post-construction
stormwater quality BMPs.
A vegetative swale will be installed along the south property line near the southwest corner of the site which will drain to the underground detention
pond located along the south end of the property under the drive area. A dry detention basin will also be constructed in the southeast corner of the site
which will discharge into the dry detention basin. See sheets C103 and C803 for the plans and details.
DESCRIPTION OF MAINTENANCE GUIDELINES FOR POST-CONSTRUCTION STORMWATER QUALITY MEASURES: (C5)
Maintenance requirements for the detention ponds and vegetative swale which will remain in place after construction is completed, are described below.
Post construction maintenance requirements for the vegetated areas and detention ponds are to include periodic inspection as needed or at least every
six months. Sediment shall be disposed of off site in accordance with all applicable laws. Areas that show signs of erosion shall be stabilized with erosion
control blanket and/or seed as necessary. Refer to the Operations and Maintenance Manual for detailed inspection and maintenance procedures.
9.SEQUENCE DESCRIBING STORMWATER QUALITY MEASURE IMPLEMENTATION RELATIVE TO LAND-DISTURBING
ACTIVITIES: (B2)
1.Schedule pre-construction meeting with City of Carmel Engineering Office at least 48 hrs prior to land disturbance.
2.Install construction entrance.
3.Utilize the gravel construction entrance for installation of the perimeter silt fence. Add stone if needed. Post the NOI at the entrance. Add
protection measures to existing inlets.
4.Install staging area, fueling station, material storage area and concrete truck washout.
5.Strip the top soil and grade.
6.Complete the cut and fills on the site. Install check dams or stabilize the slopes with erosion control blankets.
7.Building pads and disturbed areas left dormant for more than 15 days, must be temporarily seeded.
8.Install storm sewer. Provide inlet protection immediately upon completion of the inlet and install riprap outlet protection prior to installing outlets.
Final grade and stabilize slopes when inlets are functioning.
9.Seed the perimeter of the site.
10. Remove all erosion and sediment control practices when areas have a uniform grass cover.
10.LOCATIONS OF PROPOSED SOIL STOCKPILES AND/OR BORROW/DISPOSAL: (A21)
Excess soil shall be immediately stockpiled and seeded and/or removed from the construction site in accordance with all applicable laws.
11.TEMPORARY SURFACE STABILIZATION METHODS APPROPRIATE FOR EACH SEASON: (B11)
Straw mulch must be used as a minimum for the for all disturbed areas that are not receiving erosion control blanket or permanent landscaping.
Refer to the Erosion Control Details, within the Seasonal Soil Protection Chart.
PERMANENT SURFACE STABILIZATION SPECIFICATIONS: (B12)
A. Loosen lawn area to a minimum depth of 6 inches. Mix soil amendments and fertilizers with topsoil at rates specified. Organic soil amendments
such as peat, compost or manure shall be applied at 2" depth evenly over soil and incorporated into the top 6" of topsoil. Provide fertilizer with
percentage of nitrogen required to provide not less than 1 pound of actual nitrogen per 1,000 sq. ft. of lawn area and not less than 4 percent
phosphoric acid and 2 percent potassium. At least 50 percent of nitrogen to be organic form. Delay mixing of fertilizer if planting will not follow placing
of planting soil within a few days.
B. Fertilizer for lawns: provide a fast release fertilizer with a composition of 1 lb per 1,000 sq. ft. of actual nitrogen, 4 percent phosphorous, and 2
percent potassium by weight.
C. Slow-release fertilizer for trees and shrubs: granular fertilizer consisting of 50 percent water-insoluble nitrogen, phosphorous and potassium
made up of a composition by weight of 5 percent.
D. Grade lawn and grass areas to a smooth, even surface with loose, uniformly fine texture. Limit fine grading to areas that can be planted within
immediate future. Remove trash, debris, stones larger than 1 inch diameter, and other objects that may interfere with planting or maintenance
operations.
E. Sow seed using a spreader or seeding machine. Do not seed when wind velocity exceeds 5 miles per hour. Distribute seed evenly over entire
area by sowing equal quantity in 2 directions at right angles to each other.
F. Rake seed lightly into top 1/8 inch of soil, roll lightly, and water with a fine spray.
G. Install erosion control blankets as indicated on the plan.
H. Protect seeded areas against erosion by spreading clean, seed-free straw mulch after completion of seeding operations. Spread uniformly to
form a continuous blanket not less than 1-1/2 inches loose measurements over seeded areas.
I. Water newly planted lawn areas and keep moist until new grass is established. Immediately repair any lawn areas disturbed by construction
activities including tree and shrub installation.
J. Refer to the Erosion Control Details, within the Seasonal Soil Protection Chart for timing of temporary and permanent seeding and grass seed
specifications.
13.MATERIAL HANDLING AND SPILL PREVENTION PLAN: (B13)
Solid Waste Disposal:
No solid material, including building materials, is permitted to be discharged to surface waters or buried on site. All solid waste materials, including
disposable materials incidental to the construction activity, must be collected in containers or closed dumpster's. The collection containers must be
emptied periodically and the collected material hauled to a landfill permitted by the State and/or appropriate local municipality to accept the waste for
disposal.
A foreman or supervisor should be designated in writing to oversee, enforce, and instruct construction workers on proper solid waste procedures.
Hazardous Waste:
Whenever possible, minimize the use of hazardous materials and generation of hazardous wastes. All hazardous waste materials will be disposed
in the manner specified by federal, state, or local regulations or by the manufacturer.
Use containment berms in fueling and maintenance areas and where potential for spills is high.
A foreman or supervisor should be designated in writing to oversee, enforce and instruct construction workers on proper hazardous waste
procedures. The location of any hazardous waste storage areas should be indicated on the stormwater pollution prevention plan by the operator
following on-site location of the facility.
Dust Control/Off-Site Vehicle Tracking:
During construction, water trucks should be used, as needed, by each contractor or subcontractor to reduce dust. After construction, the site
should be stabilized to reduce dust.
Construction traffic should enter and exit the site at a Construction Entrance with a rock pad or equivalent device. The purpose of the rock pad is
to minimize the amount of soil and mud that is tracked onto existing streets. If sediment escapes the construction site, off-site accumulations of sediment
must be removed at a frequency sufficient to minimize offsite impacts.
Sanitary/Septic:
Contractors and subcontractors must comply with all state and local sanitary sewer, portable toilet, or septic system regulations. Sanitary
facilities shall be provided at the site by each contractor or subcontractor throughout construction activities. The sanitary facilities should be utilized by all
construction personnel and be serviced regularly. All expenses associated with providing sanitary facilities are the responsibility of the
contractors and subcontractors. The location of any sanitary facilities should be indicated on the stormwater pollution prevention plan by the operator
following on-site location of said facilities.
Water Source:
Water used to establish and maintain grass, to control dust, and for other construction purposes must originate from a public water supply or
private well approved by the State or local health department.
Equipment Fueling and Storage Areas:
Equipment fueling, maintenance, and cleaning should only be completed in protected areas (i.e., bermed area). Leaking equipment and
maintenance fluids will be collected and not allowed to discharge onto soil where they may be washed away during a rain event.
Equipment wash down (except for wheel washes) should take place within an area surrounded by a berm. The use of detergents is prohibited.
Hazardous Material Storage:
Chemicals, paints, solvents, fertilizers, and other toxic or hazardous materials should be stored in their original containers (if original container is
not resealable, store the products in clearly labeled, waterproof containers). Except during application, the containers should be kept in trucks or in
bermed areas within covered storage facilities. Runoff containing such materials shall be collected, removed from the site, and disposed of in
accordance with the federal, state, and local regulations.
As may be required by federal, state or local regulations, the Contractor should have a Hazardous Materials Management Plan and/or Hazardous
Materials Spill and Prevention Program in place. A foreman or supervisor should be designated in writing to oversee, enforce, and instruct construction
workers on proper hazardous materials storage and handling procedures. The location of any hazardous material storage areas should be
indicated on the stormwater pollution prevention plan by the operator following on-site location of the storage areas.
Material Handling and Spill Prevention:
Discharge of hazardous substances or oil into stormwater is subject to reporting requirements. In the event of a spill of a hazardous substance,
the operator is required to notify the National Response Center (1-800-424-8802) to properly report the spill. In addition, the operator shall submit a
written description of the release (including the type and amount of material released, the date of the release, the circumstances of the
release, and the steps to be taken to prevent future spills) to the local Soil and Water Conservation District. The SWPPP must be revised within 14
calendar days after the release to reflect the release, stating the information above along with modifications to minimize the possibility of future
occurrences. Each contractor and subcontractor is responsible for complying with these reporting requirements.
Concrete Washout:
All concrete trucks waste material shall be completely contained and disposed in accordance with all local, state, and federal regulations. A pit or
container is required when cleaning concrete chutes.
Spill Response Plan:
Minor - Small spills that typically involve oil gasoline, paint, hydraulic fluid etc. Minor spills can be controlled by the first responder at the discovery of the
spill.
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14.OWNER'S INFORMATION:
Name:ECL Development, LLC
Address:12965 Old Merdian St, Carmel, IN 46032
Representative:Roger Foster
Title: Director of Development
Telephone: (317) 669-6214
OPERATOR'S INFORMATION:
Name: Not known at this time
Address:
Representative:
Title:
Telephone:
Post-Construction SWPPP
1. Description of Potential Pollutant sources associated with the proposed land use: (C1)
Pollutant Source: Passenger vehicles, delivery vehicles.
Type of Pollutant: Oil, gasoline, diesel fuel, any hydrocarbon associated with vehicular fuels and lubricants
grease, antifreeze, windshield cleaner solution, brake fluid, brake dust, rubber, glass, metal and plastic
fragments, grit, road de-icing materials
Pollutant Source: Trash dumpster
Type of Pollutant: Cleaning solutions or solvents, litter (paper, plastic, general refuse associated with
distribution operations), uneaten food products, bacteria.
Pollutant Source: Lawn and landscape areas
Type of Pollutant: Fertilizers, soil, organic material (leaves, mulch, grass clippings)
2. Post-Construction Stormwater quality measures: (A19)
The stormwater quality measures proposed with this project are a vegetated swale, a dry bottom detention pond, and an Underground detention system.
a. Location - Refer to Grading Plan
b. Dimensions - Refer to Grading Plan (minimum vegetated swale length for proposed disturbance: 1,397 lf)
c. Sizing calculations - Refer to drainage report
d. Detailed specifications - Refer to drainage report
e. Construction Details - Refer to Grading Plan
3. Sequence describing stormwater quality measure implementation: (C2)
The underground detention will be installed at the start of construction during the utility construction phase of the project and will remain as permanent
water quality features.
The new dry detention ponds and vegetated swales will also act as stormwater quality measures.
4. Stormwater quality measures to be implemented to prevent or minimize adverse impacts to stream and
riparian habitats.
The detention ponds and vegetative swale will be used to remove sediment from the runoff before it is discharged.
5. An Operation and Maintenance Manual for all post-construction stormwater quality measures:
Please see the supplemental O&M for all required information.REVISIONS:3961 Perry Boulevard Whitestown, IN 46075Ph. 317-769-2916 www.innovativeeci.comENGINEERING & CONSULTING19122Rolling HillsTownhomesCarmel, IndianaECL Development, LLC12965 Old Meridian StreetCarmel, IN 46032317-669-6209C107SWPPP