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Stormwater Pollution Prevention Plan
&
Notice of Intent
NEW PHYSICAL PLANT BUILDING
HUDSON VALLEY COMMUNITY COLLEGE
City of Troy, Rensselaer County, NY
16 March 2007
Project No. 1970608
20 Shaker Road - P.O. Box 730, New Lebanon, N.Y. 12125
P: (518) 794-8613 F: (518) 766-5663 www.clarkpc.com
Clark Engineering & Surveying, P.C. Page
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Table of Contents
1. Introduction ______________________________________________________________3
1.1 Intent and Reference Standards_______________________________________________ 3
1.2 Site_______________________________________________________________________ 3
1.3 Proposed Project ___________________________________________________________ 3
1.4 Permits and Construction Schedule. ___________________________________________ 3
2. Existing Conditions ________________________________________________________4
2.1 Land Use and Vegetation ____________________________________________________ 4
2.2 Topography _______________________________________________________________ 4
2.3 Floodplain, Streams, Ponds and Wetlands______________________________________ 4
2.4 Soils______________________________________________________________________ 4
2.5 Hydrogeology______________________________________________________________ 5
3. Storm Water Runoff________________________________________________________6
3.1 Overview__________________________________________________________________ 6
3.2 Methodology_______________________________________________________________ 6
3.3 Pre-development Runoff_____________________________________________________ 7
3.4 Post Development Runoff ____________________________________________________ 7
4. Stormwater Management ___________________________________________________8
4.1 Water Quality Volume ______________________________________________________ 8
4.2 Water Quality Treatment ____________________________________________________ 8
4.3 Surface Water Impacts- Water Quantity Control _______________________________ 10
4.4 Stormwater Management Summary __________________________________________ 11
5. Stormwater Conveyance System _____________________________________________11
5.1 General __________________________________________________________________ 11
6. Erosion and Sediment Control ______________________________________________13
6.1 Erosion and Sediment Control Measures ______________________________________ 13
7. Construction Phase _______________________________________________________13
7.1 Responsible Parties ________________________________________________________ 13
7.2 Documentation at Site______________________________________________________ 13
7.3 Inspections _______________________________________________________________ 14
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7.4 Construction Sequence _____________________________________________________ 14
7.5 Construction Standards and Specifications ____________________________________ 15
7.6 Construction Pollution Prevention Measures ___________________________________ 16
8. Post Construction Inspection, Operation and Maintenance _______________________16
8.1 Inspections _______________________________________________________________ 16
8.2 Operation and Maintenance_________________________________________________ 16
9. Appendix________________________________________________________________17
Stormwater Calculations
Water Quality Calculations
Notice of Intent (NOI)
Compliance Certification
List of Figures
1.1 Site Location
2.1 Soils
3.1 Pre-Development Drainage Areas
3.2 Post-Development Drainage Areas
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1. Introduction
1.1 Intent and Reference Standards
The intent of this Stormwater Pollution Prevention Plan (SWPPP) is to evaluate and reduce
stormwater quality and quantity impacts associated with the construction of a new Physical Plant
Building at Hudson Valley Community College, Rensselaer County, New York. The plan has
been prepared in accordance with the New York State Pollutant Discharge Elimination System
(SPDES), General Permit for Storm Water Discharges from Construction Activities; Permit
Number GP-02-01.
The SWPPP has been prepared in accordance with the following reference standards:
1. NYSDEC Stormwater Management Design Manual
2. NYSDEC Reducing Impacts of Stormwater Runoff from New Development
3. New York Guidelines for Urban Erosion and Sediment Control
1.2 Site
The proposed site is located on a parcel of land currently used as a practice athletic field in the
northern portion of the campus. Access to the site is by a gravel service road. For purposes of
the study the site limits were selected based on the area directly involved with the construction
and those areas tributary to it. Total project site consists of approximately 5.31 acres pre-
development and 5.35 acres post-development.
1.3 Proposed Project
The proposed project is the construction of a new physical plant building to consolidate the
offices and services to support the campus. The building is approximately 29,500 square feet. In
addition to the building is a parking lot for the facility vehicles and staff. This parking area is
approximately 35,360 square feet. A 24’ wide paved road will be constructed to provide access
from the campus to the facility.
The project location is shown in Figure 1.1.
The project sponsor is Hudson Valley Community College who currently owns the property.
1.4 Permits and Construction Schedule.
There are no other environmental permits anticipated for the project. Construction of the project is
anticipated to commence in June of 2007 and be complete by December of 2008.
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2. Existing Conditions
2.1 Land Use and Vegetation
The site is presently open land used for athletics. The current ground cover is grass in the
athletic field, gravel on the access road, scrub meadow between the access road and the ravine,
and wooded cover on the banks of the ravine.
2.2 Topography
The site is generally flat with under 1% slopes common. Slope of the land is generally from
south to north. At the northern border of the site is the upper edge of a gentle ravine that slopes
to the north.
2.3 Floodplain, Streams, Ponds and Wetlands
The site drains to the north to a small tributary of the Wynants Kill. This stream is bordered by
Federal Wetlands, which have been delineated and are shown on the project plans. There will be
no disturbance of the wetlands by the project.
No part of the project site is within the 100 year flood zone as mapped by the Federal Emergency
Management Agency (FEMA) Flood Insurance Rate Map (FIRM).
2.4 Soils
Soils information was obtained from the US Department of Agriculture, Natural Resources
Conservation Service (formally Soil Conservation Service), Soil Survey of Rensselaer
County. The soils mapped at the project site are shown in Figure 2.1. A geotechnical report
was prepared based on soil borings in the project area and along the route of the proposed access
road. Borings, test pits and percolation tests were made in the project area to identify areas of
possible infiltration and recharge.
The predominant soil type at the southern half of the site is classified as Riverhead fine sandy
loam (RkB), 3 to 8% slopes. This gently sloping soil formed in glacial outwash that has a high
content of sand and gravel. This soil is deep and well drained. Typically, the surface layer is
friable, dark grayish brown fine sandy loam 6 inches thick. The subsoil extends to a depth of 35
inches. The upper part of the subsoil is friable, yellowish brown sandy loam, and the lower part
is friable, dark yellowish brown sandy loam. The substratum is loose, brown gravelly loamy
sand to a depth of 60 inches or more. Depth to bedrock is more than 6 feet.
The soil type at the northern half of the site is classified as Hudson silt loam (HuE). Slopes
range from 25 to 45% but is mostly 25 to 35%. This soil formed in silt and clay deposits. This
soil is deep and moderately well drained. Typically, the surface layer is friable, dark brown silt
loam 5 inches thick. The subsurface layer is friable, brown silt loam 3 inches thick. The subsoil
is firm and extends to a depth of 28 inches. It is yellowish brown silty clay in the upper part and
plastic and sticky, mottled, brown silty clay in the lower part. The substratum is firm, plastic and
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sticky, grayish brown and light olive brown silty clay to a depth of 60 inches or more. Early in
spring, a seasonal high water table is perched 18 to 24 inches below the surface.
2.5 Hydrogeology
Within the vicinity of the project site, the College and neighboring residential properties are
served by a municipal water system. There are no existing municipal or other high yield
production wells in the project vicinity. Properties in the project area are served by municipal
sanitary sewers.
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3. Storm Water Runoff
3.1 Overview
The addition of driveways, parking lots, and buildings increases the area of impervious surfaces
and reduces the time of concentration resulting in increased stormwater runoff. To mitigate this
potential impact and conform to the requirements of GP-02-01, peak flow attenuation is provided
so that release of stormwater runoff from development will not exceed the pre-development
conditions for the 1, 10 and 100 year storms. The 1-year storm will be held on site and
infiltrated or released over 24 hours. Water quality treatment is provided through filtration and
infiltration.
Calculations of runoff have been made for pre and post-development conditions. Runoff from
impervious surfaces will be collected and routed through a combination of filters, infiltration
basins, and detention basins. Filtration and settling devices treat the stormwater to remove
sediment and improve water quality. Detention facilities are designed to store stormwater runoff
and provide for a controlled gradual release to reduce the peak rate of stormwater discharge to
levels below predevelopment levels.
3.2 Methodology
Calculations were performed with the assistance of the computer program, Hydraflow ©
Hydrographs for Windows, by Intelisolve. Soil Conservation Service (SCS now known as
National Resources Conservation Service (NRCS)) methods are used to compute the SCS runoff
hydrographs for existing and proposed conditions.
The 24-hour rainfall precipitation for storm reoccurrence frequencies of 1 year, 10 year and 100-
year storm events were interpolated from the NY Rainfall maps published in the NY Guidelines
for Erosion and Sediment Control.
SCS curve numbers (CN) were obtained from SCS tables based on the cover conditions and
hydrologic soil group. A weighted average was used to obtain the composite CN for each
drainage area.
Time of concentrations for existing conditions were computed based on sheet flow and shallow
concentrated flow using SCS methods TR-55, Urban Hydrology for Small Watersheds.
Routines within the Hydraflow © computer program were used to model the detention and
infiltration basins. Calculated runoff hydrographs are routed through the storage facilities and
the resulting outflow (discharge) hydrograph is calculated based on the geometry of the storage
and the hydraulics of the outflow structure(s).
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Calculation of the Channel Protection Volume (CPv) were made using the methodologies
prescribed in the DEC Stormwater Design Manual.
3.3 Pre-development Runoff
For pre-development conditions, the runoff was computed for the site broken up into three areas
as shown on the Pre-Development Drainage Area Map.
The calculated runoff for pre-development conditions is shown in Table 3.1.
Table 3.1
Peak Pre-Development Runoff (in cubic feet per second)
AREA 1 YEAR 10 YEAR 100 YEAR
Drainage Area A .8 2.7 5
Drainage Area B 1.5 4.7 8.6
Drainage Area C .3 1 1.8
Total Site Runoff 2 6.6 12.1
3.4 Post Development Runoff
For post-development conditions, the runoff was computed for the site by breaking the project
area up into six drainage areas as shown on the Post-Development Drainage Area Map. The un-
mitigated rate of stormwater runoff from the site is predicted to be as shown in Table 3.2.
Table 3.2
Peak Post Development Runoff Before Stormwater Mitigation (in cubic feet per second)
AREA 1 YEAR 10 YEAR 100 YEAR
Drainage Area A .3 1 1.8
Drainage Area B .3 1.1 2.2
Drainage Area C 1.2 3.6 6.5
Drainage Area D 2.5 4.6 6.8
Drainage Area E .36 .9 1.5
Drainage Area F .7 1.5 2.3
Total Site Runoff 4.6 11.1 18.6
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4. Stormwater Management
4.1 Water Quality Volume
To reduce stormwater quality impacts, stormwater management systems in accordance with the
NYSDEC Stormwater Management Design Manual will be utilized to capture and treat 90% of
the average annual stormwater runoff volume. This volume is defined as the Water Quality
Volume (WQ
v
).
The water quality volume is calculated as follows:
WQ
v
= (P)(R
v
)(A)
12
Where:
WQ
v
= water quality volume in acre-feet
P = 90% Rainfall Event = 0.95” for site
R
v
= 0.05+ 0.009(I), where I is the percent impervious cover
A = site area in acres
4.2 Water Quality Treatment
Stormwater quality is a major component of the Phase II Stormwater Regulations and is typically
handled through a combination of devices including settling, filtration, and or infiltration. This
particular site is limited in the amount of treatment opportunities that are available.
The predominant soil on the site is a very slowly percolating silt and clay mix which is not
suitable for treatment or disposal through infiltration. There is however, a small area of well
percolating sandy soil in the northeast quadrant of the proposed parking lot and this will be used
for both water quality and quantity treatment through infiltration. This soil has a percolation rate
approximately 37 in/hr at the anticipated infiltration depth of 4’ below existing grade. For
purposes of design, this infiltration rate was reduced to 10 in/hr to allow for future degradation
of the soil’s absorption capacity. Two borings were also advanced in this area and showed this
sandy soil extends to a depth of 10’ and showed no groundwater.
This area will be used to treat runoff from the building and the majority of the Physical Plant
vehicle parking lot. This drainage area is shown as Area D on the Post Development Drainage
Area Map (Drawing SWPPP.02). Runoff from this area will be directed to underground storage
composed of 56 Stormtech 740 chambers. The water entering the chambers will first be run
through a section of chambers wrapped in filter fabric called an Isoloator row by Stormtech.
This section will provide for pretreatment and capture of the initial sediment load. The row will
have an inspection port and a large supply pipe to permit flushing and collecting of the collected
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sediments as necessary. Excluding the amount of runoff infiltrated during a storm event,
approximately 8,011 cubic feet of WQv storage volume will be available in these chambers.
The small remainder of the vehicle parking lot, shown as Area E on the drainage area map, will
drain southeasterly and be collected by a trench drain at the loading dock and a catch basin in the
corner of the parking lot. Runoff from this area will be treated in a second bank of Stormtech
740 chambers with an Isolator row. Treatment will be by storage and infiltration. Excluding the
amount of runoff infiltrated during a storm event, approximately 1,122 cubic feet of WQv
storage volume will be available in these chambers.
The combined discharge from Areas D & E will be conveyed to an existing swale leading to the
ravine. The end section of this pipe will be protected against erosion with stone fill.
The third area of the building site is shown as Area F on the drainage area map and is composed
mainly of a visitor parking lot and a section of the access road. The soils in this area are not
conducive to infiltration and there is limited area available for surface sand filtration. This area
will receive minimal water quality treatment consisting of pretreatment and approximately 2,000
cubic feet of storage in 20 Stormtech 740 chambers. This quantity of WQv was not included in
the total WQv in the NOI since it consists primarily of pretreatment.
The configuration of the site is such that the access road runs between the baseball field and the
crest of the slope above the ravine. There is very little land available for WQv treatment
between the road and the baseball fields and a geotechnical review of the slopes cautioned
against storing or concentrating water between the road and the crest of the ravine.
Consequently, Area C will only receive WQv treatment that is available in the ditch lines.
Longitudinal surface sand filters have been designed for Area C. These will capture runoff from
the southerly half of the access road and the softball field to the south. The runoff from Area C
will then be directed to an existing discharge pipe that leads to the ravine. Water Quality
volumes for area C were also not included in the total WQv posted in the NOI.
Area B will receive no formal WQv treatment since it consists largely of the runoff from the road
flowing overland across a broad flat grassy area above the ravine. Although not included in the
WQv for the NOI, this water will be treated by flowing across this large expanse of grass.
Area A will receive WQv treatment through a surface sand filter located adjacent to the roadway.
Roadside surface swales will provide pretreatment and convey the runoff to this feature. Once
filtered, the stormwater will be piped to an existing storm manhole. Approximately 1,700 cubic
feet of WQv storage volume will be available in this sand filter.
A total of 7,700 cubic feet of WQv is required for the six drainage areas of the post development
site. The total volume of WQv provided is 10,812 cubic feet. The Water Quality volumes are
shown for the individual areas in the following table.
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Table 4.1
Water Quality Volume
AREA
WQv
Required (cf)
WQv
Provided (cf)
Drainage Area A 411 1,679
Drainage Area B 431 None Provided
Drainage Area C 1923 None Claimed
Drainage Area D 3506 8,011
Drainage Area E 472 1,122
Drainage Area F 956 None Claimed
Total Site 7,700 10,812
4.3 Surface Water Impacts- Water Quantity Control
As shown in table 3.2 above, the peak discharge for post development drainage conditions has
been increased by approximately 50% due mostly to the increase in impervious areas of the site.
This increased runoff must be reduced to a level which will not impact the downstream areas.
One of the Phase II Permit requirements is that the 1-year storm be captured and released over a
period of 24 hours. This volume is known as the Channel Protection volume (CPv). The
required CPv volume for the site is calculated to be 8,207 cubic feet using the DEC Design
Manual Procedure and is based on the entire disturbance of the project. The CPv quantities are
provided in the Stormtech 740 chambers in Areas D, E, & F and in the surface sand filter in Area
A. These volumes are above those for the WQv and include the infiltration from the bottom of
the storage chambers in Areas D and E. The Chanel Protection volumes for the individual areas
are shown in the following table.
Table 4.2
Channel Protection Volume
AREA
CPv
Required (cf)
CPv
Provided (cf)
Drainage Area A 536 3,475
Drainage Area B 561 None Provided
Drainage Area C 2,201 None Claimed
Drainage Area D 3,640 12,214
Drainage Area E 439 2,058
Drainage Area F 830 3,536
Total Site 8,207 21,283
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The Stormtech 740 chambers and infiltration reduce the peak rates of runoff from the site
significantly. The reduction is reflected in the following table of post development rates.
Table 4.3
Peak Post Development Runoff After
Stormwater Mitigation (in cubic feet per second)
AREA 1 YEAR 10 YEAR 100 YEAR
Entire Project Site 1.8 6.5 13.6
The post-development peak runoff rates are below pre-development for all except the 100-year
event which is only 12% above the predevelopment rate. This does not meet the strict
requirements of the Phase II permit however the impact on the downstream conditions does not
appear significant.
The complete stormwater and Water Quality calculations are included in the appendix.
4.4 Stormwater Management Summary
The stormwater facilities have been designed to mitigate water quality impacts per the NYS Phase II
Stormwater SPDES permit requirements. Surface water impacts have also been mitigated through
the use of stormwater management facilities which were designed so that the peak rate of runoff
from post development conditions does not exceed the pre-development runoff rate at least up
through the 10-year event. Above this level the site constraints limit the storage available and the
reductions are not as significant. This is summarized in the following table:
Table 4.4
Peak Pre-Development vs. Post Development Runoff Comparison After Stormwater
Mitigation (in cubic feet per second)
AREA 1-
YEAR
2-YEAR 5-
YEAR
10-
YEAR
25-
YEAR
50-
YEAR
100-
YEAR
Pre-Development 2 2.6 4.5 6.6 8.2 9.9 12.
Post-Development 1.8 2.3 3.8 6.5 9 11 13.6
5. Stormwater Conveyance System
5.1 General
Stormwater flow through the stormwater conveyance system, including culverts, storm sewer
pipes, swales, road ditches, detention basin and infiltration basin outlets and spillways has been
evaluated. The NYS Stormwater Management Design Manual indicates that roadside swales,
overflow channels, pond pilot channels and flow over berms be designed for a 2-year, 24 hour
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rainfall event and that open channels, outfalls and overflow channels be designed for 10 year
storms. Discharge from the treatment devices will be conveyed to the Wynants Kill tributary via
a combination of piped and open ditch systems. Discharge from Areas D & E will be piped to an
existing swale with a stone fill protected outlet. Discharge from Area F will run from the storm
chambers in a pipe to a trapezoidal ditch installed on the least steep section of the hillside above
the ravine. The trapezoidal ditch is lined with prefabricated polyethylene panels that fasten
together with gaskets and screws. The panels are anchored into the slope so that they will not
wash downhill and provide some velocity reduction due to the corrugations in the liner.
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6. Erosion and Sediment Control
6.1 Erosion and Sediment Control Measures
Erosion and sediment control measures consistent with the New York Guidelines for Urban
Erosion and Sediment Control will be implemented. Erosion and sediment control measures are
shown on the final plans.
Proposed temporary measures include:
• Silt Saver sediment traps at inlets to catch basins.
• Silt fences on all cleared slopes as further shown on the plans.
• Erosion control blankets on banks of disturbed areas.
• Erosion control blankets and rip rap at outfalls of culverts.
• Hay bale check dams placed at not more than 100' intervals in road side swales.
• Establishing turf on all disturbed areas.
• Minimizing the amount of disturbed area exposed at any one time.
Permanent measures include:
• Riprap outlet protection at major culverts and outlet pipes.
• Erosion control blanket and rip rap outlet protection at minor culverts and outlet pipes.
• Grass lined ditches and swales on slopes less than 5%.
• Establishing turf on all disturbed areas.
7. Construction Phase
7.1 Responsible Parties
The owner of the project has engaged a construction manager who will oversee the construction
phase of the project. The construction manager is U. W. Marx who will be responsible for
ensuring that the site contractor implements the necessary erosion control practices.
A general contractor will be retained to perform site construction of the improvements. All
contractors and subcontractors shall certify compliance with the Stormwater Pollution
Prevention Plan as detailed in GP-02-01. A copy of the compliance form is included in the
Appendix.
7.2 Documentation at Site
The operator shall maintain a copy of this Stormwater Pollution Prevention Plan, the
Construction Plans, Contractor’s Certifications, Inspection Logs and any other documents
referenced in the SWPPP at the site for inspection by NYSDEC, the qualified professional site
inspector and local regulators.
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7.3 Inspections
The operator will have a qualified professional inspect the site prior to construction, after the
installation of preliminary erosion and sediment control measures prior to the start of
construction.
Once construction starts, inspections shall be conducted once per week and within 24 hours after
the end of a storm event of 0.5” or greater.
The following items will be inspected:
• Drainage swales.
• Catch basins, storm sewers and culverts.
• Silt fences (until final turf is established and they can be removed).
• Sediment traps.
• Erosion control blankets installed for slope and channel protection.
• Riprap linings and outlet protection
• Road cut and embankment slopes.
The intent of the inspections is to check for:
• Structural stability including differential settlement or cracking.
• Debris or obstructions hindering flow.
• Reduction in infiltration capacity from sediments.
• Signs of erosion.
• Loss of vegetative cover.
• Damage to slope or channel protection.
Corrective action will be taken as required by the applicant.
Inspection checklists shall be developed or adapted from those provided in the NYS Stormwater
Management Design Manual, Appendix F.
7.4 Construction Sequence
The suggested construction sequence is as follows:
1. Stake out proposed construction limits and grades.
2. Mark and protect sensitive areas such as streams or wetlands with stakes, flagging or
temporary orange construction fencing.
3. Conduct a preconstruction site meeting with owner, qualified professional inspector and
contractor(s).
4. Establish a stabilized construction entrance.
5. Install silt fence at downstream work limits as shown on erosion control plan.
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6. Clear and grub the areas necessary for construction. Leave as much natural vegetation as
possible within the work area.
7. Construct the sand filter basin in Area A.
8. Seed, mulch, and place erosion control devices on disturbed area associated with the sand
filter.
9. Construct temporary diversion swales around the work site and direct them to temporary
sedimentation basins with protected outlets. Install filter fabric and stone dams as
appropriate.
10. Stabilize all areas within one week of exposure.
11. Strip topsoil and stockpile for reuse.
12. Provide silt fences around topsoil stockpiles and protect with temporary seeding and
mulch.
13. Cut temporary stormwater ditches and diversion swales as needed to prevent stormwater
run-on into disturbed areas and to control runoff from disturbed areas.
14. Excavate temporary sediment basins at all stormwater runoff points from disturbed
areas.
15. Cut shallow swales on either side of proposed access road to collect runoff. Provide
stone check dams and/or hay bales at 100' intervals. Stormwater shall be diverted out of
ditches into temporary sediment basins at 200' intervals.
16. Install culverts, catch basins and storm sewer pipes. Protect with siltation filters such as
Silt Saver or Silt Sock.
17. Complete road, building and site construction.
18. Complete fine grading and construction of the stormwater management facilities.
19. Install permanent channel and slope protection riprap and erosion blanket materials.
20. Install permanent culvert outlet protection.
21. Topsoil and seed to establish turf in all disturbed areas.
22. Clean and flush culverts and storm sewers.
23. Inspect and maintain temporary erosion control measures until the site stabilizes and turf
is established.
The contractor shall be responsible for means and methods and implementation of effective
erosion and sediment control so no water quality standards or General Permit requirements are
violated. Additional stormwater management practices may be required as a result of the
contractor’s operations.
The contractor shall submit a proposed construction sequence if different from above, for review
and approval.
7.5 Construction Standards and Specifications
All construction shall be in accordance with the construction standards provided in Appendix C
of the NYS Stormwater Management Design Manual, except as otherwise approved by the
Engineer.
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7.6 Construction Pollution Prevention Measures
• The contractor shall use all necessary precautions to prevent pollution of water bodies or
groundwater, in accordance with all Federal, State and Local requirements.
• Spills shall be reported as required under New York State Law. The contractor shall
have the proper training, equipment and contingency planning to quickly respond to and
contain any spills.
• A phone listing of emergency numbers shall be maintained at the site.
• Construction laydown and storage areas shall be identified and established to minimize
potential impacts to the environment or neighbors. All temporary construction areas
shall be fully restored and seeded to establish turf.
• Dust shall be controlled through spraying with a water truck as needed.
• Stabilized construction entrances and other measures as needed shall be implemented to
minimize the track out of dirt, sediment, or dust on to adjacent roadways.
• Roadways shall be regularly inspected, and power broomed or hosed down to clean and
control dust as necessary.
• All temporary fuel tanks shall provide double containment.
• Equipment should be washed and maintained so as not to leak fluids.
• No equipment should enter streams or water bodies.
• Site litter shall be prevented through daily policing and proper disposal.
8. Post Construction Inspection, Operation and Maintenance
8.1 Inspections
All stormwater management and conveyance structures and areas disturbed by the project shall
undergo continued inspections after major storm events.
8.2 Operation and Maintenance
The owner shall be responsible for the operation and maintenance tasks related to the
improvements and stormwater facilities include the following:
• Repair or correct any items found deficient in the inspections.
• Inspect the Isolator rows on the stormwater chambers at least quarterly until a track
record has been established and longer (or shorter) intervals are warranted.
• Remove sediments from the Isolator rows as indicated by the inspections.
• Mow sand filter basin and roadside grass areas a minimum of 2 times per year.
• Re-seed to establish turf as required in areas of thin cover.
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9. Appendix
Pre-Development Runoff Calculations
Stormwater Management Calculations
Post Development Runoff Calculations
Notice of Intent (NOI)
Contractor’s Certification
Utility and Grading Plans
Erosion Control Plan
Stormwater Details
Page 1 of 9
New York State Department of Environmental Conservation
Division of Water
625 Broadway, 4th Floor
Albany, New York 12233-3505
NOTICE OF INTENT
All sections must be completed unless otherwise noted
. Failure to complete all items may
result in this form being returned to you, thereby delaying your coverage under this
General Permit. Applicants must read and understand the conditions of the permit and
are responsible for identifying and obtaining other DEC permits that may be required.
To properly complete this form, please refer to the Instruction Manual which can be
accessed at www.dec.state.ny.us/website/dow/toolbox/instr_man.pdf
-IMPORTANT-
THIS FORM FOR MACHINE PRINT ONLY
RETURN THIS FORM TO THE ADDRESS ABOVE
OWNER/OPERATOR
MUST SIGN FORM
Stormwater Discharges Associated with
Construction Activity
Under State
Pollutant Discharge Elimination System (SPDES) General Permit # GP-02-01
Owner/Operator Information
Owner/Operator Contact Person Last Name (NOT CONSULTANT)
Owner/Operator Contact Person First Name
Owner/Operator Mailing Address
City
State Zip
-
Phone (Owner/Operator)
- -
Fax (Owner/Operator)
- -
Email (Owner/Operator)
Owner/Operator (Company Name/Private Owner Name/Municipality Name)
NYR
(for DEC use only)
1752059166
HUDSON VALLEY COMMUNITY COLLEGE
COWAN
STEVE
80 VANDENBURGH AVE .
TROY
NY
12180
12180
518
629
7356
5186297356
518
629
7514
5186297514
cowanste@hvcc .edu
Location Information
1. Provide the Geographic Coordinates for the project site in NYTM Units. To do this you
must
go to the NYSDEC Stormwater Interactive Map on the DEC website at:
www.dec.state.ny.us/website/imsmaps/stormwater/viewer.htm
Zoom into your Project Location such that you can accurately click on the centroid of
your site. Once you have located your project site go to the dropdown menu on the left
and choose "Get Coordinates". Click on the center of your site and a small window
containing the X, Y coordinates in UTM will pop up. Transcribe these coordinates into the
boxes below. For problems with the interactive map use the help function.
X Coordinates (Easting) Y Coordinates (Northing)
Project Site Information
Project/Site Name
Street Address (NOT P.O. BOX)
City/Town/Village (THAT ISSUES BUILDING PERMIT)
State Zip
-
DEC Region (if known)County
Name of Nearest Cross Street
Distance to Nearest Cross Street (Feet)
Direction to Nearest Cross Street
North South East West
Page 2 of 9
2. What is the nature of this construction project?
New Construction
Redevelopment with increase in imperviousness
Redevelopment with no increase in imperviousness
7599059161
NEW PHYSICAL PLANT BUILDING
80 Vandenburgh Avenue
TROY
NY
12180
12180
RENSSELAER
4
VANDENBURG AVE - ROUTE 4
2500
608410
4727846
4727846
3. Select the predominant land use for both pre and post development conditions.
SELECT ONLY ONE CHOICE FOR EACH
7. In accordance with the larger common plan of development or sale; enter the total
project site acreage, the acreage to be disturbed and the future impervious area
(acreage)within the disturbed area. Round to the nearest tenth of an acre.
8. Will there be more than 5 acres disturbed at any given time?
9. Indicate the percentage of each Hydrologic Soil Group(HSG) at the site.
Page 3 of 9
Existing Land Use
FOREST
PASTURE/OPEN LAND
CULTIVATED LAND
SINGLE FAMILY HOME
SINGLE FAMILY SUBDIVISION
TOWN HOME RESIDENTIAL
MULTIFAMILY RESIDENTIAL
INSTITUTIONAL/SCHOOL
INDUSTRIAL
COMMERCIAL
ROAD/HIGHWAY
RECREATIONAL/SPORTS FIELD
BIKE PATH/TRAIL
SUBSURFACE UTILITY
PARKING LOT
OTHER
OTHER
OTHER
. .
Future Land Use
SINGLE FAMILY HOME
SINGLE FAMILY SUBDIVISION
TOWN HOME RESIDENTIAL
MULTIFAMILY RESIDENTIAL
INSTITUTIONAL/SCHOOL
INDUSTRIAL
COMMERCIAL
ROAD/HIGHWAY
RECREATIONAL/SPORTS FIELD
BIKE PATH/TRAIL
LINEAR UTILITY (water, sewer, gas, etc.)
PARKING LOT
OTHER
Yes No
Pre-Development
Post-Development
4. Will future use of this site be an agricultural property as defined
by the NYS Agriculture and Markets Law ?
Yes No
Yes No
5. Is this a project which does not require coverage under the General
Permit (e.g. Project done under an Individual SPDES Permit, or
department approved remediation)?
Yes No
6. Is this property owned by a state authority, state agency or local
government?
A B C D
%
%
%
%
Project Site Information
Number of Lots
Total Site
Acreage
. .
Acreage To
Be Disturbed
Existing Impervious
Area Within Disturbed
Future Impervious
Area Within Disturbed
4198059163
5
3
5.3
3
4
3.4
9
.9
2
1
2.1
10
90
*
Receiving System(s)
15. Does the site runoff enter a separate storm sewer system-
including roadside drains, swales, ditches, culverts, etc?
(
if no, skip question 16 )
16. What is the name of the municipality/entity that owns the separate storm sewer system?
12. Provide the name of the nearest, , classified surface waterbody(ies) into
which construction site runoff has the potential to discharge.
Page 4 of 9
13. Has the surface waterbody(ies) in question 12 been identified as a
303(d) segment?
14. Is this project located in a TMDL Watershed?
*
*NOTE:
If you answered Yes to either question 13 or 14, Pursuant to Part I.D.3.(b) of
the permit, you
must
have your SWPPP prepared and certified by a licensed/certified
professional and the SWPPP is subject to a 60-business day review.
For Questions 13 and 14 refer to the Instruction Manual for a subset of 303(d)
segments and TMDL watersheds subject to Condition A of the permit. These waterbodies
and watersheds have been identified for regulation within the stormwater program due
to some level of impairment by nutrients, silt or sediment. The Instruction Manual
can be accessed at www.dec.state.ny.us/website/dow/toolbox/instr_man.pdf
Yes No
Yes No
Yes No Unknown
17. Does any runoff from the site enter a sewer classified as
a Combined Sewer?
Yes No Unknown
10. Is this a phased project? (
if yes, The SWPPP must address all planned
phases)
Yes No
*
11. Enter the planned start and end
dates of the disturbance activities
-
Start Date
/ /
End Date
/ /
natural
3431059162
06
01
07
060107
10
30
08
103008
UNNAMED TRIBUTARY OF THE WYNANTSKILL
HUDSON VALLEY COMMUNITY COLLEGE
*
Page 5 of 9
21. The Stormwater Pollution Prevention Plan (SWPPP) was prepared by:
18. Has the required Erosion and Sediment Control component of the SWPPP
been developed in conformance with the current NYS Standards and
Specifications for Erosion and Sediment Control (aka Blue Book) ?
19. Does this construction activity require the development of a SWPPP that
includes Water Quality and Quantity Control components (Post-Construction
Stormwater Management Practices)
20. Have the Water Quality and Quantity Control components of the SWPPP
been developed in comformance with the current NYS Stormwater Management
Design Manual ?
NOTE:
If you answered no to question 18 or 20, Pursuant to Part I.D.3.(b) of the permit,
you
must
have your SWPPP prepared and certified by a licensed/certified professional and
the SWPPP is subject to a 60-business day review. Please provide further details in the
details/comment
section on the last page of this form.
*
Yes No
If no, Skip question 20
*
Yes No
*
Yes No
Professional Engineer (P.E.)
Soil and Water Conservation District (SWCD)
Registered Landscape Architect (R.L.A)
Certified Professional in Erosion and Sediment Control (CPESC)
Owner/Operator
Other
SWPPP Preparer Information
(if different from Owner/Operator info)
SWPPP Preparer
Contact Name (Last, Space, First)
Mailing Address
City
State Zip
-
Phone
- -
Fax
- -
Email
Stormwater Pollution Prevention Plan (SWPPP)
3875059164
CLARK ENGINEERING & SURVEYING P .C .
THOMAS H . FIELD III P .E .
P .O . BOX 730
NEW LEBANON
NY
12125
0730
121250730
518
794
8613
5187948613
518
766
5663
5187665663
TFIELD@CLARKPC .COM
Erosion and Sediment Control Practices
23. Select
all
of the erosion and sediment control practices that will be employed
on the project site.
Page 6 of 9
Biotechnical
Brush Matting
Wattling
Other
22. Has a construction sequence schedule for the planned management
practices been prepared?
Yes No
Brush Matting
Dune Stabilization
Grassed Waterway
Mulching
Protecting Vegetation
Recreation Area Improvement
Seeding
Sodding
Straw/Hay Bale Dike
Streambank Protection
Temporary Swale
Topsoiling
Vegetating Waterways
Vegetative Measures
Check Dams
Construction Road Stabilization
Dust Control
Earth Dike
Level Spreader
Perimeter Dike/Swale
Pipe Slope Drain
Portable Sediment Tank
Rock Dam
Sediment Basin
Sediment Traps
Silt Fence
Stabilized Construction Entrance
Storm Drain Inlet Protection
Straw/Hay Bale Dike
Temporary Access Waterway Crossing
Temporary Stormdrain Diversion
Temporary Swale
Turbidity Curtain
Water bars
Temporary Structural
Debris Basin
Diversion
Grade Stabilization Structure
Land Grading
Lined Waterway (Rock)
Paved Channel (Concrete)
Paved Flume
Retaining Wall
Riprap Slope Protection
Rock Outlet Protection
Streambank Protection
Permanent Structural
Stormwater Pollution Prevention Plan (SWPPP)
2200059165
EROSION CONTROL BLANKET ON EXPOSED SLOPE
Page 7 of 9
Important
:Completion of Questions 24-30 is not required if the project:
Disturbs less than 5 acres
and
is planned for single-family residential homes(including
subdivisions) or construction on agricultural property
and
does not have a discharge to
a 303(d) water or is not located within a TMDL watershed.
Additionally, sites where there will be no future impervious area within the disturbed
area
and
that do not have a change(pre to post development)in hydrology do not need to
complete questions 24-30.
24. Indicate all the permanent Stormwater Management Practice(s) that will be
installed on this site
Water Quality and Quantity Control
Micropool Extended Detention (P-1)
Wet Pond (P-2)
Wet Extended Detention (P-3)
Multiple Pond System (P-4)
Pocket Pond (P-5)
Ponds
Filtering
Surface Sand Filter (F-1)
Underground Sand Filter (F-2)
Perimeter Sand Filter (F-3)
Organic Filter (F-4)
Bioretention (F-5)
Dry Swale (O-1)
Wet Swale (O-2)
Open Channels
Infiltration Trench (I-1)
Infiltration Basin (I-2)
Dry Well (I-3)
Infiltration
Shallow Wetland (W-1)
Extended Detention Wetland (W-2)
Pond/Wetland System (W-3)
Pocket Wetland (W-4)
Wetlands
Describe other stormwater management practices not listed above or explain any
deviations from the technicial standards. If the SWPPP does not conform to the
technicial standards, the SWPPP must be prepared and certified by a
licensed/certified professional and is subject to a 60-business day review.
Post Construction Stormwater Management Practices
Other
Has a long term Operation and Maintenance plan for the post
construction management practices been developed?
If Yes, Identify the entity responsible for the long term Operation and Maintenance
Yes No
Stormwater Pollution Prevention Plan (SWPPP)
3471059166
The required WQv and CPv volumes are provided in total but three of the drainage areas are
not receiving full WQv treatment Two of these areas are primarily grass cover and will remain
grass on completion of the project and the other is receiving CPv treatment This is due to the
limited room on the site and slope stability constraints on placement of surface or underground
treatment facilities The Qp volumes are met but the Qf volumes fall 12 percent short of the
goal
HUDSON VALLEY COMMUNITY COLLEGE
Page 8 of 9
Water Quality and Quantity Control
IMPORTANT:
For questions 27 and 28 impervious area should be calculated considering the
project site and all offsite areas that drain to the post-construction stormwater
management practice(s) (Total Drainage Area = Project Site + Offsite areas)
27. Pre-Construction Impervious Area - As a percent of the Total
Drainage Area
enter the percentage of the existing impervious areas
before construction begins.
28. Post-Construction Impervious Area - As a percent of the Total
Drainage Area
enter the percentage of the future impervious areas that
will be created/remain on the site after completion of construction.
WQv Required
Total Water Quality Volume (WQv)
WQv Provided
.
acre-feet
25. Provide the total water quality volume required and the total provided for the site.
.
acre-feet
The need to provide for flood control has been waived because
.
CFS
CFS
.
Post-development
Pre-Development
Total Extreme Flood Control Criteria (Qf)
- Peak discharge rate for the 100 year storm
.
CFS
.
CFS
Post-development
Pre-Development
Total Overbank Flood Control Criteria (Qp)
-
Peak discharge rate for the 10 year storm
Site discharges directly to fourth order stream or larger
The need to provide for channel protection has been waived because
.
acre-feet
CPv Provided
acre-feet
.
CPv Required
Total Channel Protection Storage Volume (CPv)
- Extended detention of
post-developed 1 year, 24 hour storm event
26. Provide the following Unified Stormwater Sizing Criteria for the site.
Site discharges directly to fourth order stream or larger
Downstream analysis reveals that flood control is not required
29. Indicate the total number of permanent stormwater management
practices to be installed
30. Provide the total number of stormwater discharge points from the
site (include discharges to either surface waters or to seperate
storm sewer systems)
Stormwater Pollution Prevention Plan (SWPPP)
%
%
2725059167
177
.177
248
.248
188
.188
488
.488
6
6
6.6
6
5
6.5
12
13
12.13
13
6
13.6
18
41
5
6
Details/Comments
Air Pollution Control
Coastal Erosion
Hazardous Waste
Long Island Wells
Mined Land Reclamation
Other SPDES
Solid Waste
Stream Protection/Article 15
Water Quality Certificate
Dam Safety
Water Supply
Freshwater Wetlands
Tidal Wetlands
Wild, Scenic and Recreational Rivers
Other Permits
Page 9 of 9
DEC Permits
31. Select any other DEC permits that are required for this project or
None
32. If this NOI is being submitted for the purpose of
continuing coverage
under a
general permit for stormwater runoff from construction activities, please indicate
the former SPDES number assigned.
Certification
I have read or been advised of the permit conditions and believe that I understand them. I also
understand that, under the terms of the permit, there may be reporting requirements. I also certify under
penalty of law that this document and the corresponding documents were prepared under my direction or
supervision in accordance with a system designed to assure that qualified personnel properly gather and
evaluate the information submitted. Based on my inquiry of the person(s) who manage the system, or those
persons directly responsible for gathering the information, the information submitted is, to the best of
my knowledge and belief, true, accurate and complete. I am aware that there are significant penalties for
submitting false information, including the possibility of fine and imprisonment for knowing violations.
I further understand that coverage under the general permit will be identified in the acknowledgment that
I will receive as a result of submitting this NOI and can be as long as sixty (60) days as provided for
in the general permit. I also understand that, by submitting this NOI, I am acknowledging that the SWPPP
has been developed and will be implemented as the first element of construction. and agreeing to comply
with all the terms and conditions of the general permit for which this NOI is being submitted.
Owner/Operator Signature
Date
Other
/ /
Print First Name
Print Last Name
MI
0567059169
NYR
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Plan New Physical Plant Cover (Hudson Valley Community College)

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Completed 25 July 2020

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