Module 6 SWMP Template Part 1

Module 6SWMP Template Part 1

SWMP Template Part 1 Agenda

o Types of CDOT SWMP Templates.o Completing Section 1 of the SWMP template

including:• Project Site Location/Description• Proposed Sequencing for Major

Construction Activities• Acres of Disturbance• Soils Information • Existing Vegetation• Potential Pollutant Sources• Receiving Waters• Non-Stormwater Discharges

2SWMP Template Part 1

Two Template Options1. Under an Acre2. An Acre or greater

SWMP Template Options

https://www.codot.gov/programs/environmental/landscape-architecture

www.fhwa.dot.gov


2+3

Poll question

https://www.codot.gov/programs/environmental/landscape-architecture

SWMP Templates


WEBSITE

LOCATION OF LATEST SWMP TEMPLATE

SWMP Template Review


o Focus on projects one acre or greater

o Color coded text

• Red - SWMP Administrator for Design to read and complete. • Black -Standard language typically citing CDOT specifications

3

Poll question

SWMP Requirements In Accordance with SCP

The SWMP with coverage under a SCP must include the following at a minimum:


o Qualified Stormwater Manager

o Spill Prevention and Response Plan

o Materials Handling

o Potential Sources of Pollutants

o Implementation of Control Measures

o Site Description

o Site Map/Location Map

o Final Stabilization and Long-Term Stormwater Management

SWMP Site Description Per SCP

o Nature of construction activitieso Proposed schedule for sequence for

major activitieso Estimates for total area of the site, and the areas

of disturbanceo Describe soil data or soil erosion potentialo Description and estimate of the percent vegetative cover prior

to disturbance/construction (and methodology)o Description of any allowable non-stormwater discharges from

site, including those being discharged under low risk discharge guidance policy


SWMP Site Description Per SCP

o Description of areas receiving discharge from the site. Including a description of the immediate source receiving the discharge. If the stormwater discharge is to a municipal separate storm sewer system, the name of the entity owning that system, the location of the storm sewer discharge, and the ultimate receiving water(s); and


o Description of all stream crossings located within the construction site boundary

1.A. PROJECT SITE LOCATION:

o Location and project limits/extento Address of the construction office


3 Site Description

1.B. PROJECT SITE DESCRIPTION:

o Description and nature of the construction activities

o Type of project

o Summary of grading activities, installation of utilities, paving, excavation, landscaping, etc.

o Describe final disposition of the property

Site Description

The SWMP Administrator for Design may also refer to DSR Meeting Question Responses, SWMP

Informational requests for descriptions or Form 46310SWMP Template Part 1

3

1.C. PROPOSED SEQUENCE FOR MAJOR CONSTRUCTION ACTIVITIES:

o Describe sequence of construction events involved in the project• (i.e. clearing and grubbing, grading,

drainage, excavation, and any structures removal and construction that may impact water quality)

• Required language- stabilize all areas that are not paved or landscaped through establishment of vegetative cover

Site Description


3

1.D. ACRES OF DISTURBANCE:

o Includes clearing, grading, excavation, stockpiling of fill materials, demolition, areas with heavy equipment/vehicle traffic, installation of new or improved haul roads and access roads, staging areas, dedicated borrow/fill areas and storage that will disturb existing vegetative cover (round to nearest 100th of an acre or nearest sq. ft)

1. Total area of construction site(LOCs) acres:2. Total area of disturbance (LDAs) acres: 3. Total area of seeding acres:4. Total area of pre-project impervious surface (Sq.ft):5. Total area of FINAL impervious surface (Sq.ft):

Site Description


3

Quiz Time!


1. True of False: The disturbance limits can be larger than the construction limits.

2. True or False: Areas being seeding can be zero if all disturbed areas are being paved or otherwise surfaced with a non-erosive material.

FALSE

TRUE

www.clu-in.org

1.E. EXISTING SOIL DATA:

o Provide a summary of any existing soil data that describes the soil types, their erodibility, and potential for erosion. Must provide source.

Site Description


3

Site Description

See Chapter 4.11.2 of CDOT’s Erosion Control and Stormwater Quality Guide and CDOT LA Website

o Determine who performs vegetative survey

o Data must include general description of existing vegetation, percent cover and date of survey

o Photo documentation and methodology required (CDOT transect methodology preferred - others must be pre-approved)


1.F. EXISTING VEGETATION INCLUDING PERCENT COVER:

3

Methods must be the same (pre and post construction)

Site Description

o Refer to Potential Pollutant Sources in SWMP Section 4A. The SWMP Administrator for Construction shall prepare a list of all potential pollutants and their locations in accordance with subsection 107.25.

Section 107.25 of specifications defines pollutant16

1.G. POTENTIAL POLLUTANTS SOURCES:

SWMP Template Part 1

3

Site Description

CDOT 107.25, Pollutant:

Dredged spoil, dirt, slurry, solid waste, incinerator residue, sewage, sewage sludge, garbage, trash, chemical waste, biological material, radioactive material, heat, wrecked or discarded equipment, rock, sand, or any industrial, municipal, or agricultural waste.


3

16

1. Outfall locations: o Size, type, location of pipes, ditch and provide

description of drainage pattern from the siteo Description of immediate receiving waters, MS4

system including location/owner 2. Names of immediate receiving water(s) on site (Is the

immediate receiving water listed as a 303(d) waterbody or an outstanding water?)

3. Ultimate receiving water4. Description of all stream crossings located within the

Construction Site Boundary (table for location, stream name, and description of disturbed upland areas)

Site Description


1.H. RECEIVING WATERS: 3

https://cdphe.colorado.gov/water-quality-control-commission-regulations

Ultimate Receiving Water – First Classified Waterway - ultimate can also be same as intermediate if the classified water system is within the Project.

o Identify location of any anticipated sources of allowable non-stormwater components of the discharge including discharges from DIVERSIONS

o SWMP Administrator for Construction will supply method statement.

Site Description


1.I. Non-Stormwater Discharges:

3+4

o When applicable, the Contractor must provide a method statement based on data form Hydraulic Engineer.

o If the diversion does not meet CDPHE criteria as listed in COR400000 Part 1.B.1.a.i.i.1 or 2, alternative criteria must be submitted and approved by CDPHE and meet COR400000 Part 1.B.1.a.i.i.3.

Site Description


1.J. Alterative Diversion Criteria:

3+4

o If stabilization exceeds the 14 day schedule then the SWMP must document the constraints, and

o Provide alternative schedule and locations where applicable.

Site Description


1.L. Alternative Temporary Stabilization Schedule:

3

Powers Blvd Extension North Project Example

Break-out groups: Use documents provided in supplementary materials to fill out Section 1 of

the SWMP template pdf


2

Powers Blvd Extension North Project is located between Interstate 25 and Voyager Parkway, located just south of North Gate Blvd in Colorado Springs, El Paso County.

Powers Blvd Extension North Project


1. A. Project Site Location:

Powers (SH83) to I-25 includes earthwork, fencing, creating roadway connecting the highway and interstate, installing drainage, fencing, grading, erosion and sediment controls, seeding and mulching



1. B. Project Site Description:


1. Plastic fence2. Erosion/Sediment Control3. Clearing and

Grubbing4. Grading and Earthwork5. Drainage 6. Interim Controls7. Paving 8. Permanent

Stabilization25SWMP Template Part 1

1. C. Proposed Sequence for Major Construction Activities:


1. Total area of construction site: 35 acres2. Total area of disturbance: 30 acres3. Acreage of seeding: 22 acres4. Total area of pre-project impervious surface: 0 square feet5. Total area of FINAL impervious surface: 348,480 square feet

26

1.D. Acres of Disturbance:



Powers soil conditions consists primarily of Pring course sandy loam. Erosion Potential is moderate and source is NRCS WSS

www.foodstorageandbeyond.com


1.E. Existing Soil Data:

Existing Vegetation Powers Blvd Extension North Project


1.F. Existing Vegetation:

65% consisting mostly of grasses - survey date 7/15/13 using CDOT Transect Method


All information in provided black text – no changes.


1.G. Potential Pollutant Sources:

27

1.H.1 Drainage prior to construction is primarily to the southwest. After construction, the drainage will be conveyed by two culverts shown on Site Maps (put size in once known). 1.H.2 Unnamed drainages, new CDOT culverts, and wetland. There are also two existing inlets on Voyager Parkway are part of Colorado Springs MS4 that are upgradient from construction. 1.H.3 Monument Branch, listed on 303(d) for E.coli1.H.4 No stream crossings are anticipated for this project



1.H. Receiving Waters:

None known at this time



1.I. Non-Stormwater Discharges:

Flow is generally to the south and west under existing conditions and drains to two areas of concentrated flow, ultimately draining to Monument Branch. Proposed grading and drainage will be south with some interior drainage to the new inlets along the highway. Ultimately, the drainage will go to Monument Branch via wetlands and new culverts and inlets.



1.J. Description of Drainage Patters From the Site:

No changes to text



1.K. Alternative Diversion Criteria:

No changes to text



1.L. Alternative Temporary Stabilization Schedule:

Questions?


Module 6 SWMP Template Part 1

Documents

Transcript of Module 6 SWMP Template Part 1