module 5 inventory and analysis
TRANSCRIPT
Module 5 Inventory and Analysis
Slide 1
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Inventory and Analysis Agenda
Case Study Inventory and Analysis
o Desktop reviews
o Field data
o Additional desktop reviews (as needed)
SWMP Information Inventory and Analysis
o Existing topography and drainageo Receiving waters, impairments and outstanding waters o MS4
• Outfalls/permanent water quality structures• Local municipal design criteria
o Noxious weeds and existing vegetationo Existing soils data
• Web soil surveyo Geotechnical reportso Groundwater reportso Floodplainso Environmental impacts
• Threatened and Endangered• Wetlands
o Grading plans/cross sections proposed changesSlide 3
3Case Study Inventory and Analysis
Desktop Reviews - Data Gathering
4Case Study Inventory and Analysis
OTIS /CPLAN
MS4 Impaired streams Noxious weeds Receiving waters
Identifying permits (MS4, State and/or Fed)
Local drainage design criteria or details
Topography, hydrology, and soils/geology
Potential groundwater contaminants
Other sensitive areas
CDOT Online Transportation Information System (OTIS)
http://dtdapps.coloradodot.info/otis
5Case Study Inventory and Analysis
Poll question
OTIS
o First zoom into the map – use address locator upper right
o Check Boundaries
o Check Transportation
o Options under Environmental (Water Quality, Biological)
http://dtdapps.coloradodot.info/otis
6Case Study Inventory and Analysis
OTIS
http://dtdapps.coloradodot.info/otis7Case Study Inventory and Analysis
Project Area
OTIS
Boundaries
Urban Areas Adjusted 2010
https://dtdapps.coloradodot.info/MapViewext/
8Case Study Inventory and Analysis
Local Municipal Design Standards and Permits
o Some local municipalities have design standards that are more stringent than CDOT’s
o Research and coordination with the local municipality to determine which standards apply (IGA or other agreement may be required)
o What permits might be needed (e.g., local grading permit, GESC permit, stormwater discharge permit) – coordination with MS4
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Municipal Separate Storm Sewer System (MS4) Agency Agreements
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o IGAs may be required.
o IGAs define responsibilities.
o Clarify roles prior to project starting.
o Can be timely to get set-up.
Quiz Time
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Receiving Waters
12Case Study Inventory and Analysis
Receiving Waters
13Case Study Inventory and Analysishttps://www.epa.gov/waterdata/waters-geoviewer
14https://www.epa.gov/waterdata/viewing-waters-data-using-google-earth#Download
Receiving Waters
Overview of Receiving Waters/Watersheds
MODULE 6
15Slide 15Case Study Inventory and Analysis
Black Forest Fire General Burn Area
Poll question
Impaired Waters – 303(d) and TMDL Listed and Other Information
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http://cdphe.maps.arcgis.com/apps/Viewer/index.html?appid=f1541d2f21834642ba1551c674fd4a79
CDPHE – Water Quality Control Division• Added online ArcGIS tools.
• Geodata can be downloaded.
• Most current data
CPLAN
MODULE 6
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http://cdot.maps.arcgis.com/apps/webappviewer/index.html?id=129bef3793774ade81cfca5ec9baff7d
Impaired Waters – 303(d) and TMDL Listed
CPLAN
Zoom into the Project Site
Click CDPHE impaired waterways
Right hand side –View in attribute table can be selected
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CDPHE Water Quality GIS Maps
19Case Study Inventory and Analysishttps://www.colorado.gov/pacific/cdphe/clean-water-gis-maps
Watershed Rapid Assessment Program (WRAP)
20Case Study Inventory and Analysishttps://erams.com/map/
Topography, Area and Precipitation Data
21https://streamstats.freshdesk.com/support/solutions/articles/9000055576-colorado
Site Aerial Photograph –Onsite Drainage Review
MODULE 6
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Existing Conditions Survey
MODULE 6
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Slide 23
Existing Drainage Flow – BlueProposed Culvert - Black
Case Study Inventory and Analysis
Project – Powers Blvd Extension North
Unnamed Tributary
Voyager Parkway
CPLAN - USFWS Critical Habitat
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CPLAN - USFWS Wetlands
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Noxious Weeds
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o OTIS o Environmentalo Biologicalo Noxious Weeds based on last update
Sites That Might Influence Dewatering Permitting
o LUST Sites
o CERCLA
o VCUPs
o Uranium tailings
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https://cdphe.colorado.gov/hm-gis-data
https://ops.colorado.gov/Petroleum/maps
OTIS Windshield Survey
http://dtdapps.coloradodot.info/otis/Windshield#2017/001A/0/1/128Case Study Inventory and Analysis
Obtaining Field Data
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Schedule a site visito Collect Information
Case Study Inventory and Analysis
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Site Visit Information to Collect
o Take pictures of site/features
o Note on your plans, grading sheets, aerial or topographical maps areas• Major features/topo• Vegetation (Native vs noxious
weeds)• Intersections• Green space/parks• Neighborhoods• Drainage/flow direction• Wildlife activity• Sensitive areas
Site Visit
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Existing Vegetation Determination/Percent Cover
Requirements from Chapter 4, Section 4.5 Required prior to construction to assess
plant density and cover.
Performed by SWMP Administrator for Design or Construction
Used to close the SCP
CDOT Landscape Architect should be contacted if technical support is needed
https://www.codot.gov/programs/environmental/landscape-architecture/swmp/vegetative-transect-procedure-1.pdf
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Poll question
Updated Procedure:
o A minimum of (1) 50-ft. transect for projects less than 5 acres.
o For sites between 5 and 20 acres, it is recommended there be two transects.
o LA determines # transects required for large construction projects (>20 acres)
o Performed during the growing season
o Pre and post construction vegetation determinations should be conducted the same time of year and at the same general locations.
Vegetation Determinations
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o Safety PPEo 50 foot tape measureo Pointed wooden dowel, steel rod
or other type of pole that is at least 2-4 long
o Digital camera, phone, ipad or other equipment to take photographs and record GPS locations
o Project site mapo Data sheetso Index cards or some way of
noting the transect number o Pen o Or software like Survey 1,2,3 to
record data and photographso Noxious weed field guide (rec)
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Equipment
o Safety tailgate meeting
o Find representative area
o Take a photograph of the unique transect number written on an index card or designate the unique number using software such as Survey 1,2,3.
o Record transect location (preferably using GPS)
o Lay a tape measure down or mark out 50 feet.
o Take a photograph at the starting end and another one at the other end looking across transect. Take three more photographs facing down at the vegetation and tape measure at the beginning, middle and end of transect and one additional of the surrounding area.
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Vegetative Determination Process11
o Start at the 0 ft of the tape measure and move 1 ft and extend the dowel, steel rod or other type of pole straight down to the ground.
o Evaluate if bare soil or vegetation is encountered
o Record result on data sheet
o Move to the next 1 ft marker on the tape measure.
o Total vegetative hits within the 50 ft transect
o Divide by 50 and multiply by 100 to get percent cover
o All transect locations should be added to the SWMP Site Maps along with the percent cover.
o An average of the percent cover from the total transects and date of vegetation transect survey is added to the SWMP Plan Sheets.
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Vegetative Determination Process
o Vegetation consists of viable grasses, shrubs, trees, or forbs
o Indicate if there are weeds on your transect form. Noxious weeds will be counted as pre-construction cover but not for post-construction
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Noxious and Common Weeds
http://plants.usda.gov/java/noxious?rptType=State&statefips=08https://www.colorado.gov/pacific/agconservation/noxious-weed-species
Powers Transect Pre-Construction
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2
Powers Summary Transect Sheet
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2
Photographs
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Add photographs, data sheets and other vegetative determination documentation to Projectwise
www.sev.lternet.edu/
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o Laying out a 50-foot tape
o At every footmark, document whether vegetation or bare soil is encountered. (vegetation consists of viable grasses, shrubs, trees, or forbs –weeds are not counted for post construction vegetation)
o Take photos of each transect and each foot.
o Results are totaled and expressed as a % cover
What is the sequence of performing a transect?
Quiz Time
Case Study Inventory and Analysis
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Quiz Time
Case Study Inventory and Analysis
Field Observations on Flow and Drainage
o Observe and record existing drainage, flow direction (run-on and run-off), and erosion.
o Use proposed design to evaluate:
• impacts new drainage features/patterns
• High erosion risk areas
o Work with the Hydraulic Engineer on controls for run-on.
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Field Observations on Sensitive Areas
o Evaluation of sensitive areas
o Review the NEPA report prior to the field visit
o Verify these are identified in preliminary design plans
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Existing Wetland
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Regional Wetland Biologist
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https://www.codot.gov/programs/environmental/wetlands
To determine if there are any wetlands that will be affected by the project.
o Work with the regional, consultant resource specialist - Regional Wetland Biologist
o Review Biologic Resource Report
o Review NEPA documents
Regional Biologist
To determine if there are any threatened and endangered species (wildlife and plants) that will be affected by the project.
www.fws.gov
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o Work with the regional, consultant resource specialist – Regional Biologist
o Review Biologic Resource Report
o Review NEPA documentso This person may or may not
the same as the Regional Wetland Biologist.
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o Soil information
o Geotech reports
Other Field Data that are Combined with Desktop Reviews
Web Soil Survey (WSS)
www.blogdivvy.com
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Mobile SoilwebProgression of screens as you are using soilweb app
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Mobile Soilweb
WebSoil App download link
https://play.google.com/store/apps/details?id=com.casoilresourcelab.soilweb&hl=en_US&gl=US
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Field Testing
On site field soil testing
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Powers Site Existing Soils
Organic layer
Topsoil
Subsoil
Parent Material
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Sandy Loams
Soil Erosion Potential
Erosion factor Ko Indicates the susceptibility of a soil to sheet and rill
erosion by water
o K is 1 of 6 factors in RUSLE to predict the average annual rate of soil loss by sheet and rill erosion in tons/acre/yr.
o Based primarily on % silt, sand, and organic matter and on soil structure and permeability
o Values 0.02 to 0.69
o Higher the value, the more susceptible the soil is to sheet and rill erosion
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Soil Texture
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Soil Permeability
Consider soil permeability if you are constructing sediment traps, sediment basins and infiltration BMPs
www.techalive.mtu.edu/
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Hydrologic Soil Group (HSG)
o Group A - Low runoff potential, high infiltration
o Group B – Moderate runoff potential and infiltration
o Group C – Low infiltration rates typically with a layer that impedes downward movement of water
o Group D – High runoff potential, low infiltration rates
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Example - Powers Blvd. utilized temporary berms as perimeter protection
o What type of soils are on site? Is a berm a good fit for the site?
o Will these soils be ideal for vertical tracking?
Control Selection Based On Soil Type
Poor compaction
Good compaction
Quiz Time
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Geotechnical Reports
A Geotechnical Engineer should perform a full geotechnical report including:
o Geologic mapping
o Rock slope stability analyses
o Preliminary recommendations for embankment repair, fill retention, rock slope slopestabilization, and rockfallprotection
o Preliminary recommendations for pavement design based on geotech information
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Groundwater Monitoring
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Additional Desktop Reviews -Proposed Grading Plan
Wetlands
Cross Drainage
Future Development
Drainage tributary
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Voyager Pkwy
I-25
Proposed Cross Sections
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3
6729.67’
6757.246755.92
CDOT Project Development “Process”
Environmental Evaluation/NEPA starts
ConstructionPhase
DesignPhase
Proposed Project
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Scope
FIR
FOR
AD
Construction
Module 4 - 10
Module 11
Module 11
Module 14
Module 3
SWMP Development
Process Occurs
Case Study Inventory and Analysis
Stormwater Scope – Team Exercise
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Stormwater Team Exercise (Exercise #1):
o Review the following from the class files:• SWMP Informational Request Form.• Site aerials.• Topography maps, initial designs, and cross-
sections.• DSR Meeting Questions responses.
o Divide into teams and list initial stormwater concerns and potential required permits
Case Study Inventory and Analysis
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Quiz Time
Case Study Inventory and Analysis
Name at least three types of soil properties that might be helpful to know in order to appropriately select construction control measures?
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o Erosion Potential
o Texture
o Runoff Potential/HSG
o Permeability
o Soil Compaction
Quiz Time
Case Study Inventory and Analysis
Questions?
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