HomeMy WebLinkAbout04120019.9SITE NAME
The area scheduled for construction is known as "Medford Place" (hereinafter referred to as the "Project ").
PROJECT LOCATION
The propert is located at Southeast Corner of Michigan Road and 106th Street in Carmel, Indiana, at a latitude
of 39.9390�N and a longitude of 86.2357 0 W.
OWNER'S INFORMATION
Name: PR Block C, LLC
Address: 8463 Castlewood Drive, Indianapolis, Indiana 45250
Representative: Mr. Craig May
Title:
Telephone: (317) 841 -1002
Facsimile: (317) 576 -5173
OPERATOR'S INFORMATION
Name: Not available
Address:
Representative:
Title:
Telephone:
Facsimile:
NOTICE OF INTENT
All parties defined as owners or operators must submit a Notice of Intent (N01) at least 48 hours prior to
commencement of on -site construction activities. Submittal of late N01's is not prohibited; however, authorization
under the construction general permit is only for discharges that occur after permit coverage is granted. Unpermitted
discharges may be subject to enforcement actions by the EPA. For the purposes of this permit, an operator is defined
as any party meeting either of the following requirements:
a) The party has operational control over construction plans and specifications, including the ability to make
modifications to those plans and specifications.
b) The party has day -to -day operational control of those activities at a project that are necessary to ensure
compliance with a stormwater pollution prevention plan for the site or other permit conditions.
A2 11" x 17" PLAT
Refer to Sheet C1.1
A3 PROJECT NARRATIVE
This project consists of the construction of the development of the Soutwest parcel in Black C at West Carmel
Center in Carmel, Indiana. The development includes the construction of one 9,150 -sft retail shopping center and
supporting facilities and infrastructure, not limited to the following activities: removal and stockpiling of top soil
and installation of sanitary sewers and laterals, water laterals, storm sewers, and other utilities.
The site shall be paved and landscaped.
The drainage plans for the site include a storm sewer desigred for conveyance of 10 -year flood discharges to an
existing detention pond along the western and southern property lines.
A4 VICINITY MAP
Refer to Title Sheet
Record Description:
Lot 3, Block C, West Carmel Center
A part of the Northwest Quarter of Section 7, Township 17 North, Range 3 East located in Clay Township,
Hamilton County, Indiana being bounded as follows:
Commencing at the Northeast Corner of the Northwest Quarter of Section 7, Township 17 North, Range 3 East;
thence South 00 degrees 25 minutes 52 seconds East (assumed bearing) 45.00 feet along the East Line of said
h Norm
t the ' action from
i a southerly direction) ' ularl n )
Northwest Quarter to a point being 45.00 feet (measured perpendicularly Y
Line of said Northwest Quarter; thence South 89 degrees 05 minutes 48 seconds West 691.99 feet parallel with
the North Line of said Northwest Quarter to the point of beginning of West Carmel Center Replat of Block A as
per plat thereof recorded as instrument #2002000009391 in Plat Cabinet 2, slide 746 by the recorder of
Hamilton County, Indiana, the following five (5) courses are along the boundary of said subdivision; 1) thence
South 45 degrees 40 minutes 18 seconds East :35.21 feet; 2) thence South 00 degrees 26 minutes 24 seconds
East 146.27 feet to the point of curvature of a curve to the left, said point of curvature being South 89 degrees
33 minutes 36 seconds West 390.00 feet from the radius point of said curve; 3) thence southerly and
southeasterly 242.81 feet along said curve to its point of tangency, said point of tangency being South 53
degrees 53 minutes 17 seconds West 390.00 feet from the radius point of said curve; 4) thence South 36
degrees 06 minutes 43 seconds East 77.55 feet; 5) thence South 53 degrees 05 minutes 14 seconds West
313.37 feet; thence South 27 degrees 05 minutes 05 seconds East 339.38 feet to the POINT OF BEGINNING of
this description; thence South 27 degrees 05 minutes 05 seconds East 269.02 feet to the point of curvature of
a curve to the left, said point of curvature being South 62 degrees 54 minutes 55 seconds West 415.00 feet
from the radius point of said curve; thence southeasterly 65.38 feet along said curve to its point of tangency,
said point of tangency being South 53 degrees 53 minutes 18 seconds West 415.00 feet from the radius point of
said curve; thence South 36 degrees 06 minutes 42 seconds East 22.04 feet to the northwestern boundary of
Block D, West Carmel Center as per plat thereof recorded as instrument #200000057496 in Plat Cabinet 2, aide
515 by said Recorder, the next four (4) courses are along the boundary of said Block D, West Carmel Center; 1)
thence South 55 degrees 41 minutes 53 seconds West 35.14 feet; 2) thence South 43 degrees 20 minutes 38
seconds West 83.70 feet; 3) thence South 45 degrees 18 minutes 00 seconds West 89.114 feet; 4) thence South
53 degrees 11 minutes 22 seconds West 157.11 feet to the northeastern right -of -way for US 421 (Michigan °ood)
(the South 18 degrees 19 minutes 31 seconds East 820.87 foot -long course; the bearing is recited from the
WARRANTY DEED recorded as instrument #200100027 °61 by said Recorder); thence North 18dearees� 39
minutes 52 seconds West 487.29 feet along said right- of -wny line to a point being South 71 degrees ,6 mi::utes
06 seconds West of the point of beginning; thence North 71 degrees 16 minutes 06 seconds East 276.51 fefRt to
the POINT OF BEGINNING containing 3.005 acres, more or less.
Note: This tract of land shall be described as Lot 3 of Block C of West Carmel Center upon the recording of the
plat.
A6 LOCATION OF ALL LOTS AND PROPOSED SITE IMPROVEMENTS
The site will not be subdivided; therefore, there are no individual lots on the property. The overall site plan, Sheet
C2.1, shows the proposed site improvements.
A7 HYDROLOGIC UNIT CODE (HUC)
05120201120
A8 STATE AND FEDERAL WATER QUALITY PERMITS
None are required for this project.
A9 SPECIFIC POINT WHERE STORMWATER DISCHARGE WILL LEAVE THE SITE
Stormwater drainage from the site will be conveyed by a storm sewer to an existing dry detention pond located
along the west and south side of the site. The existing outlet for the detention pond discharges into the existing
Michigan Road culvert.
i A10 LOCATION AND NAME OF ALL WETLANDS, LAKES, AND WATERCOURSES ON AND ADJACENT TO THE SITE
No wetlands or adjacent lakes have been identified on the site or downstream of the project that may be
Impacted by storm water discharges as a result of the proposed construction activities.
a All IDENTIFICATION OF ALL RECEIVING WATERS
CD
oThe site discharges to the Michigan Road culvert which i5 part of the Park Northwestern Legal Drain.
N The ultimate receiving water is Eagle Creek.
5 Al2 IDENTIFICATION OF ALL POTENTIAL DISCHARGES TO GROUND WATER
0 There are no locations on site where surface water may be discharged into ground water.
tj ,
S A13 100 -YEAR FLOODPLAINS, FLOODWAYS, AND FLOODWAY FRINGES
E The site does not lie within any floodplain, floodway, or floodway fringe. The information was obtained from Flood
3 Insurance Rate Map Panel 1805700205 F dated February 19, 2003 for Hamilton County, Indiana.
3 A14 PRE - CONSTRUCTION AND POST - CONSTRUCTION ESTIMATE CF PEAK DISCHARGE
Pre - construction 10 -year discharge: 3.56 cfs
Ile
o Post - construction 10 -year discharge: 0.96 cfs
i A15 ADJACENT LAND USE
0
Upstream Water shed:
U_
3 North: Commercial
S
East: Undeveloped Commercial
0 South: Pipeline Easement & Commercial
M West: Michigan Road
W
o Alb LOCATIONS AND APPROXIMATE BOUNDARIES OF ALL DISTURBED AREAS
8 The project site is approximately 3.005 acres of which 1.60 acres will be disturbed by construction activities. Refer to
a; plan sheet C4.1 for the construction limits.
It
A17 IDENTIFICATION OF EXISTING VEGETATIVE COVER
At this time, grassy cover exists.
A18 SOILS MAP INCLUDING SOIL DESCRIPTION AND LIMITATIONS
W Soil information from the Hamilton County Soil Survey is on Sheet C4.1.This site has Crosby silt loom
and Brookston soils.
o The suitability f the soils for pavement (local roads and streets) is listed in Table 8 as severe. The on -site soil will
y
be treated as recommended by the geotechniccl engineer if 'Lhe conditions are unsuitable for the pavement
Q system. Remedial treatments may include, but are not limited to, removal of unsuitable soil and backfilling with
0 engineered material, installation of a geofabric within c- under the pavement system, or treatment of the subgrade
En
o with lime.
The limitations of the soils for small commercial buildings as listed in Table 8 as severe. The foundations of the
building will be designed by the structural engineer to accommodate the actual bearing capacity of the soil. The on-
site soil will be treated as recommended by the geotechniccl engineer if the conditions are unsuitable for the
foundation system. Remedial treatment may include, but is not limited to, removal of the suitable soil and
backfilling with engineered material
Other suitability or limitations of the soil for the other classifications of use listed in the table are not applicable
to this project.
A19 LOCATIONS, SIZE, AND DIMENSIONS FOR PROPOSED STORMWATER SYSTEMS
Locations of stormwater systems: Sheet C3.1
Size of storm sewer: C3.1
Details of storm inlets and manholes: C6.2
A20 PLANS FOR ANY OFF -SITE CONSTRUCTION ACTIVITIES ASSOCIATED WITH THIS PROJECT
No off site constuction activities are anticipated as part of this project.
A21 LOCATIONS OF PROPOSED SOIL STOCKPILES AND /OR BORROW /DISPOSAL
Excess soil shall be immediately stockpiled and seeded and /or removed from the construction site in
accordance with all applicable laws.
A22 EXISTING SITE TOPOGRAPHY
Refer to Sheet c1.1.
A23 PROPOSED FINAL SITE TOPOGRAPHY
Refer to Sheet C3.1.
B1 DESCRIPTION OF POTENTIAL POLLUTANT SOURCES ASSOCIATED WITH CONSTRUCTION ACTIVITIES
The following potential pollutant sources may be associated with construction activities on site:
1. Material storage areas (more specifically described below)
2. Construction waste material
3. Fuel storage areas and fueling stations
4. Exposed soils
5. Leaking vehicles and equipment
6. Sanitary waste from temporary toilet facilities
7. Litter
8. Windblown dust
9. Soil tracking off site from construction equipment
during development of the
The fallowing construction materials will be staged or stored on site at various points du ng p
site:
1. Structural fill
2. Road Base
3. Plastic drainage pipe
4. Water main pipe and appurtenances
5. Concrete drainage pipe
6. Concrete culverts
7. Precast concrete manholes
8. Rock rip -rap
B2 SEQUENCE DESCRIBING STORMWATER QUALITY MEASURE IMPLEMENTATION RELATIVE TO LAND - DISTURBING ACTIVITIES
1. Install construction entrance.
2. Utilize the gravel construction entrance for installation of the perimeter silt fence.
Add stone if needed. Post the NOI at the entrance.
3. Install staging area, fueling station, material storage area and concrete truck washout.
4. Strip the 'top soil and grade.
5. Complete the cut and fills on the site. Final grade
and seed the pond slopes. Install check dams or stabilize the slopes with erosion
control blankets.
6. Start building construction. Install staging area for building materials.
7. Install storm sewer and other utilities. Provide
inlet protection immediately upon completion of the inlet and install riprop outlet
protection prior to installing outlets. Final grade and stabilize slopes when inlets
are functioning.
8. Seed the perimeter of the site.
9. Complete utility installation, curbs, paving and building construction.
10. Install landscaping plant material and stabilize all disturbed areas.
11. Remove all erosion and sediment control practices when areas have a uniform grass
cover.
B3 STABLE CONSTRUCTION ENTRANCE LOCATIONS AND SPECIFICATIONS
Refer to Sheet C5.1 for location and C5.3 for details.
B4 SEDIMENT CONTROL MEASURES FOR SHEET FLOW AREAS
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). The location where this condition will exist
is on the sides of the edge of the detention pond. The height of
the sloped areas is generally less than seven feet. Because lengths and heights of the slopes are small, more
aggressive erosion control measures were not c onsidered.
Refer to Sheet C4.1 for details.
85 SEDIMENT CONTROL MEASURES FOR CONCENTRATED FLOW AREAS
Concentrated flow in ditches will be protected by rock check dams, Refer to
Sheet C5.1 for the locations of rock check dams and Sheet C5.3 for construction
details.
Straw bales and silt fences will not be allowed as concentrated flow protection measures.
86 STORM SEWER INLET PROTECTION MEASURE LOCATIONS AND SPECIFICATIONS
The contractor shall install sand bags around each inlet in paved areas and straw bales around inlets in grass
areas during construction. The proposed inlet will contain a permanent two -foot sump to collect sediment during and
after construction. Refer to Sheet C5.1 for locations and refer to Sheet C5.3 for details.
Straw bales alone will not be allowed as inlet protection measures.
B7 RUNOFF CONTROL MEASURES
Rock check dams will be used to control runoff in concentrated flow areas.
Refer to Sheets C5.1 and C5.3.
88 STORMWATER OUTLET PROTECTION SPECIFICATIONS
Stormwater outlets will be protected by riprop aprons. Refer to Sheet C5.1 and C5.3
89 GRADE STABILIZATION STRUCTURE LOCATIONS AND SPECIFICATIONS
Erosion control blankets will be utilized as grade - stabilization structures. Refer to sheets C5.1 and C5.3.
810 LOCATION, DIMENSIONS, SPECIFICATIONS, AND CONSTRUCTION DETAILS OF EACH STORMWATER QUALITY MEASURE
Existing stormwater detention ponds are included in this'project
The detention ponds will provide a sediment removal function n addition to the primary
function of controlling peak discharges from the site.
Bll TEMPORARY SURFACE STABILIZATION METHODS APPROPRIATE FOR EACH SEASON
Refer to Sheet C5.3, within the Seasonal Soil Protection Chat.
812 PERMANENT SURFACE STABILIZATION SPECIFICATIONS
A. Loosen lawn area to a minimum depth of 6 inches. Mix soli 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. 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.
C. 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.
D. Rake seed lightly into top 1/8 inch of soil, roll lightly, and water with a fine spray.
E. Install erosion control blankets as indicated on the plan.
F. 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.
G. Water newly planted lawn areas and keep moist until new gross is established. Immediately repair any lawn
areas disturbed by construction activities including tree and shrub installation.
H. Refer to Sheet C5.3, within the Seasonal Soil Protection Chart for timing of temporary and permanent
seeding and grass seed specifications.
B13 MATERIAL HANDLING AND SPILL PREVENTION PLAN
Solid Waste Disposal
to discharged to surface waters or buried on site.
' I i permitted be disch
terra s s
No solid material, including building ma p g
All solid waste materials, including disposable materials incidental to the construction activity, must be collected
in containers or closed dumpsters. 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 subccntract)rs 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 heolth department.
Equipment Fueling and Storage Areas
Equip` lent 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
circumstances o. the
P f he release,
material released, date o t
mount of
he type and a ,
release (including t yp
release, and the steps to be taken to prevent future spills) to the focal 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 1oncrete trucks shall be cleaned in the designated concrete washout area. Waste material shall be completely
contained and disposed in accordance with all local, state, and federal regulations.
Spit Response OIan
'i'ne project supervisor should be notified of all spills. if a spill has the potential for groundwater or surface water
pollution, the Carmel Fire Department (317- 571 -2600) and the owner (317-841 -1002) should be contacted. If a
spill does ollute the surface or ground water, the IDEM Spill Response Center (888 - 233 -7745) and the County
Surveyor (317- 776 -8495) need to be contacted. (The Surveyor is a contact only if the drainage system
discharged into a Regulated Drain.)
All possible measures such as diking or coiling a spill cieon -up specialist shall be used to minimize any impacts.
Clean up materials shall be stocked on the construction site at all times.
B14 M0' 110RING AND MAINTENANCE GUIDELINES FOR EACH PROPOSED STORMWATER QUALITY MEASURE
Irlspec` ion Schedule, /Reporting
Ali - ,pacted areas, as well as all erosion and sediment control devices, will be inspected every seven (7)
calendar days and within 24 hours after a rainfall of 0.5 inch or greater. Where sites have been final or
temporarily stabilized or on sites where runoff is unlikely due to winter conditions (e.g., site is covered with
snow, ice, or frozen ground exists), such inspections shall be conducted at least once every month.
Inspections shall be conducted and a written report prepPared, b a designated and qualified person familiar with
the USEPA NPDES Storm Water General Permit, this SWPPP, and the Project.
Inspectiun reports shall be completed including scope of the inspection, name(s) and qualifications of personnel
making the inspection, the date of the inspection, observations relating to the implem3ntation of the SWPPP,
and any actions taken as a result of incidents of noncompliance noted during the inspection. The inspection
report should state whether the site was in compliance or identify any incidents of noncompliance. The
contractor shall keep a copy of the inspection reports on site and permanently for a period of two years
following construction. The on -site reports may be requested by inspections conducted by the local Soil and
Water Conservation District.
Construction Entrance
Locations where vehicles exit the site shall be inspected for evidence of off -site sediment tracking. Each
contractor and subcontractor shall be responsible for maintaining the Construction Entrance and other controls
as described in this SWPPP.
Material Storage Inspections
Inspectors must evaluate areas used for storage of materials that are exposed to precipitation. The purpose is
to ensure that materials are protected and /or impounded so that pollutants cannot discharge from storage
areas. Off -site material storage areas used solely by the subJ'ect project are considered to be part of the
project and must be included in the erosion control plans and the site inspection reports.
Soil Stabilization Inspections
Seeded areas will be inspected to confirm that a health stand of vegetation is maintained. The site has
achieved final stabilization once all areas are covered with pavement or have a stand of vegetation with at least
70% of the background vegetation density. The density of 70% or greater must be maintained to be considered
rs 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 ony 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 %.
1 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 shcll 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 outfolls and
daily pickup of litter.
h the event that sediment escapes the construction site, off -site accumulations of sediment must be removed
of 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
additional n ill
silt barrier or other structural controls. Assessing the need for an d installing ad controls will 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 N01 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 permittees 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.
B15 EROSION AND SEDIMENT CONTROL SPECIFICATIONS FOR INDIVIDUAL BUILDING LOTS
Since the entire site is under a single ownership, there are not any individual building lots.
Cl DESCRIPTION OF POLLUTANTS AND THEIR SOURCES ASSOCIATED WITH THE PROPOSED LAND USE
The proposed land use is a medical facility. The pollutants and sources of each pollutant normally expected
from this type of land use are listed below:
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: Retail building
Type of Pollutant: Cleaning solutions or solvents, leaks from HVAC equipment, grit from roof drainage,
aggregate or rubber fragments from roofing system.
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: Parking lot
Type of Pollutant: Any pollutant associated with vehicular sources, grit from asphalt wearing surface,
bituminous compounds from periodic maintenance (sealing, resurfacing and patching), pavement de -icing
materials, paint fragments from parking stall stripes, concrete fragments, wind -blown litter from off -site
sources, elevated water temperatures from contact with imperVous surfares
Pollutant Source: Lawn and landscape areas
Type of Pollutant: Fertilizers, soil, organic material (leaves, mulch, grass clippings)
The anticipated pollution sources are the vehicles that will use facility, including both delivery trucks and
passenger vehicle traffic. Possible pollutants include oil, gasoline, anti- freeze and other pollutants
associated with vehicular traffic.
C2 SEQUENCE DESCRIBING STORMWATER QUALITY MEASURE IMPLEMENTATION
The stormwater detention ponds will remain in place as permanent features after construction is completed.
Although the purpose of the ponds is to restrict stormwater discharges, they will provide an incidental
sediment removal function.
Oils, grease, brake fluid and gasoline spilled on -site shall be immediately absorbed with products such as
with local regulations.
' accordance atrons.
disposed of m
perlite vermiculite, sand or polypropylene and p 9
C3 DESCRIPTION OF PROPOSED POST - CONSTRUCTION STORMWATER QUALITY MEASURES
Grading and Drainage
The offsite areas and lawn areas that sheet drain to the proposed sv-ale along the noth and south sides of the
site will be seeded and blanketed to reduce the possibility of erasion. The roofdrains from the building will be
dirrected by the underground piping to the detention pond. This will eliminate concentrated flow from
downspouts that could erode lawn areas adjacent to the building.
Detention Pond
The site drainage plan includes detention ponds. All of the site drainage will be directed through the detention
system prior to discharge to the Park Northwestern Legal Drain. Although the detention ponds were not designed
as a stormwater quality ponds. They will provide a sediment removal function that is very close to that provided
by a stormwater- quality swale.
Design Considerations Relative to Stormwater Quality
f post- quality
As mentioned previously, this project contains plans for installation o po stormwater qua ty
Best Management Practice (BMP) such as the detention pond and the sumps in the stormwater inlets.
A description of some stormwater quality BMPs that may be incorporated into the project in the future are as
follows. the feasibility of applying any of these practices to a particular project is a complicated decision -
making process that io olves input from the owner and regulatory agencies. In addition, each local authority
will dictate design criter 4: and practices that may very widely fr ,)m one jurisdiction to the next. Therefore, the
use of any of BMPs in the list is speculative. The fact that r BNiP is list should not be understood to mean only
that it might have been installed at this project or that it should be considered for a similar project in the
future. Furthermore, the lack of any of the following stormwater quality measures in this plan is not an
admission of errors, omissions, or negligence on the part of the engineer or the owner.
Typical Stormwater - Quality BMPs and methods to reduce stormwater pollutants
Stormwater Ponds
These ponds can be incorporated into the design of a stormwater detention pond or can be separate structures.
Stormwater Wetlands
Stormwater wetlands are artificial wetlands created for the purpose of stormwater pollutant removal and
quantity control.
Bioretention areas
Bioretention areas (sometimes called rain gardens) are structural stormwater controls that capture and
temporarily store runoff using soild and vegitation in landscaped arias to remove pollutants. Bioretention areas
are engineered facilities in which runoff is conveyed as sheet flow to the treatment area, consisting of a grass
bufer strip, ponding area, organic layer, soil and vegetation.
Sand filters
Sand filters are structural stormwater controls that temporarily store stormwater and pass it through a filter
bed of sand.
Water quality swales
Dry water quality swales (sometimes called biofiltration swales) are, cnannels designed and constructed to
capture and treat stormwater runoff within dry cells formed by check dams or other means.
Biofilters
Biofilters are densley vegetated sections of land designed tc treat runoff and remove pollutants through
vegetative filtering and infiltration.
Catch basin inserts or manufactured structural BMPs
Many variations of catch basin inserts or manufactured BMPs exist. Inserts are devices inserted into a standard
catch basin. Manufactured structural BMPs are catch basins manufactured offsite and assembled in place.
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.
C4 LOCATION, DIMENSIONS, SPECIFICATIONS, AND CONSTRUCTION DETAILS OF EACH STORMWATER QUALITY MEASURE
The following items are stormwater quality measures that will be installed during construction. These items will
remain in place after construction is completed and ire considered to serve an incidental function as
post - construction stormwater quality BMPs.
Dry Detention Ponds
The location, details, and specifications for the stormwater detention ponds are shown an sheet C5.1.
Rock Check Dams
The location of the rock check dams are shown on sheet C5.1 the details and
specifications are shown on sheet C5.3.
C5 DESCRIPTION OF MAINTANENCE GUIDELINES FOR POST - CONSTRUCTION STORMWATER QUALITY MEASURES
Maintenance requirements for the detention pond, swales and inlet sumps, which will remain in place after
construction is completed, are described below.
Dry Detention Pond
The detention ponds will be maintained and monitored to prevent the accumulation of silt that would inhibit its
function to control stormwater discharge rates.
Post construction maintenance requirements for the 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.
Sumps in Inlets
Inlet sumps shall be inspected and cleaned at the end of construction reqardless of whether is has reached its
sediment capacity. Inspect act every six months
and clean as
needed. Inspect and clean each sump
once
annually
regardless of whether it has reached its sediment storage capacity.
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