Arriba Rest Area - Advertisement - Appendix M - SWMP.pdf

Template Revised: 2.25.2022

SWMP TEMPLATE (PLAN SHEETS) FOR PROJECTS WITH LESS THAN 1 ACRE OF DISTURBANCE (2/25/2022)

1. SITE DESCRIPTION

The Contractor shall comply with all CDOT contractual requirements. The SWMP Administrator for Construction shall update to reflect current project site conditions.

A. PROJECT SITE LOCATION:

Location or address of construction office:

Arriba rest area, southwest of I-70 Frontage Road and Highway 43/63 intersection in Arriba, Colorado.

B. PROJECT SITE DESCRIPTION:

Interior renovation work will be completed on the rest area bathrooms. The work requires an electrical connection between separate structures, which will be installed by trenching beneath the sidewalk that sits between them.

C. PROPOSED SEQUENCING FOR MAJOR CONSTRUCTION ACTIVITIES:

The concrete will be sawcut, trench dug, conduit installed, trench backfilled, and concrete repaired.

D. ACRES OF DISTURBANCE:

1. Total area of construction site (LOC): 0.25 acres

2. Total area of proposed disturbance (LDA): 30 square feet

E. EXISTING SOIL DATA:

Colby-Weld silt loams, well drained, low runoff Data Source(s): USDA Web Soil Survey

F. EXISTING VEGETATION, INCLUDING PERCENT OF VEGETATIVE COVER:

During design, the SWMP Administrator for Design in consultation with the Engineer will determine if the SWMP Administrator for Design or the SWMP Administrator for Construction will conduct the Vegetation Transects. If the site is disturbed, an Adequate Reference Site(s) may be utilized, refer to the permit.

Pre-Construction Date of survey: n/a Percent Existing Vegetative Cover: n/a Description of existing vegetation: n/a Method for determining percent vegetative cover: n/a Include a map or table showing transect locations, photos documenting pre-Construction vegetative cover, and methodology used to determine existing vegetative cover to SWMP tab 17:

Post-Construction Date of survey: ______________ Percent Vegetative Cover: ______________ Description of vegetation:

The method used to determine pre-construction percent cover shall be used to determine post construction percent cover.

Include map or table showing transect locations, photos documenting post-Construction vegetative cover, and methodology used to determine existing vegetative cover to SWMP tab 17:

2. STORMWATER MANAGEMENT CONTROLS FOR FIRST CONSTRUCTION ACTIVITIES

THE CONTRACTOR SHALL PERFORM THE FOLLOWING:

A. POTENTIAL POLLUTANT SOURCES

Refer to Potential Pollutant Sources in SWMP Section 4A. Evaluate, identify and describe all potential sources of pollutants at the site in accordance with subsection 107.25 and place any Control Measures required to contain potential pollutants.

B. OFFSITE DRAINAGE (RUN ON WATER):

Place Control Measures to address run-on water in accordance with subsection 208.03.

C. CONSTRUCTION DEWATERING:

Obtain a CDPS Dewatering Permit from CDPHE if conditions of their Low Risk Guidance for Discharges of Uncontaminated Groundwater to Land are not met; see subsections 107.02 and 107.25.

Refer to CDPHE Low Risk Discharge Guidance Document of Uncontaminated Groundwater to Land.

https://www.colorado.gov/pacific/sites/default/files/WQ%20LOW%20RISK%20GW.pdf

D. VEHICLE TRACKING CONTROL:

Control Measures shall be implemented in accordance with subsection 208.04.

E. PERIMETER CONTROL:

Perimeter control shall be established as the first item on the SWMP to prevent the potential for pollutants leaving the construction site boundaries, entering the stormwater drainage system, or discharging to state waters.

Perimeter control may consist of berms, silt fence, erosion logs, existing landforms, or other Control Measures as approved.

3. QUALIFIED STORMWATER MANAGERS:

A. SWMP ADMINISTRATOR FOR DESIGN:

CDOT Certified Individual responsible for developing SWMP Plan Sheets and SWMP Site Maps during the design phase.

Name/Title Contact Information Certification # David Mendel, Environmental Unit Supervisor David.mendel@state.co.us; 720.642.0537 7915455A

B. SWMP ADMINISTRATOR FOR CONSTRUCTION:

(As defined in Section 208) The Contractor shall designate a SWMP Administrator for Construction. The SWMP Administrator for Construction shall become the operator for the SWMP and assume responsibility for all design changes to the SWMP implementation and maintenance in accordance to 208.03, the SWMP shall remain the property of CDOT. The SWMP Administrator for Construction shall be responsible for implementing, maintaining, and revising SWMP, including the title and contact information. The activities and responsibilities of the SWMP Administrator for Construction shall address all aspects of the project’s SWMP. (Update the information below for each new SWMP Administrator for Construction) (Copy of TECS Certification must also be included in the SWMP.)

Name/Title Contact Information (phone & email)

TECS Certification # Start Date Engineer Approval

C. PERMANENT STABILIZATION SUBJECT MATTER EXPERT: This qualified individual will be either a Regional

Environmental Staff member, or an Independent Contractor Controller (Independent Assurance Program).

This expert is a project team leader responsible for ensuring project adherence to requirements of the 207 and 212 Project Special Provisions as follows, and will be available for questions regarding permanent stabilization requirements.

1. Review the Topsoil Management Plan and the Permanent Stabilization Site Maps.

2. Attend the Environmental Pre-construction Conference.

3. Coordinate the Site Pre-vegetation Conference.

4. Review and recommend approval of products.

5. Review and recommend approval of the Quantities Verification Prerequisite.

6. Attend the Partial Landscape Completion Walkthrough.

7. Attend the Final Landscape Completion Walkthrough.

Name/Title Contact Information n/a n/a

4. DURING CONSTRUCTION

The SWMP should be considered a “living document” that is continuously reviewed and modified. During construction, the following items shall be added, updated, or amended as needed by the Contractor in accordance with Section 208

A. MATERIALS HANDLING AND SPILL PREVENTION:

prior to construction commencing the Contractor shall submit a Spill Prevention, Control and Countermeasure Plan, see subsection 208.06. Materials handling shall be in accordance with subsection 208.06.

B. OTHER CDPS PERMITS:

List applicable CDPS permits associated with the permitted site and activities.

C. STOCKPILE MANAGEMENT:

shall be done in accordance with subsections 107.25 and 208.07

D. CONCRETE WASHOUT:

Concrete wash out water or waste from field laboratories and paving equipment shall be contained in accordance with subsection 208.05.

E. SAW CUTTING:

shall be done in accordance with subsections 107.25, 208.04, 208.05

F. STREET SWEEPING:

shall be done in accordance with subsection 208.04

5. CONTROL MEASURE MAINTENANCE

Maintenance shall be in accordance with subsection 208.04 (f).

6. INTERIM AND PERMANENT STABILIZATION

The Contractor shall comply with all interim stabilization and permanent stabilization requirements in accordance with subsection 208.04(e).

A. SEEDING PLAN

No seeding required; AOD will be repaved.

B. SEEDING APPLICATION:

No seeding required; AOD will be repaved.

C. MULCHING APPLICATION:

D. SPECIAL REQUIREMENTS:

E. SOIL AMENDMENT REQUIREMENTS:

No seeding required; AOD will be repaved.

F. SOIL RETENTION COVERING:

No seeding required; AOD will be repaved.

G. PERMANENT STABILIZATION APPLICATION UNDER STRUCTURES:

Under structures shade patterns should be considered and the use of Median Cover Material (Stone) or other stabilized options with an approved Project Special Provision should be used. See SWMP Site Map for locations.

H. RESEEDING OPERATIONS/CORRECTIVE STABILIZATION:

7. PRIOR TO PROJECT FINAL ACCEPTANCE

1. When directed by the Engineer, removal and disposal of temporary control measures shall be included in the cost of work.

2. At the end of the project, all ditch checks shall consist of either temporary erosion logs (or equivalent) or permanent riprap.

3. Refer to Specification 208.10 for Items to be completed prior to requesting partial acceptance of water quality work

8. NARRATIVES:

Control Measure Matrixes During Construction:

1. Control measure narratives have been included for the CDOT Standard Specifications and Standard Plan M-208 and M-216 along with any non-standard control measures approved during the design process. If a Non-Standard Control Measure not included in the SWMP is proposed and approved by the Engineer the SWMP Administrator for Construction shall do the following: Place an “X” in the column for non-standard and complete a Non-Standard Control Measure Specification and Narrative covering the what, when, where and why the control measure is being used shall be add to the SWMP. The appropriate “X” shall also be added to the implementation phase(s).

2. The SWMP Administrator for Construction shall place an “X” in the column In Use On Site when the control measure has been installed.

3. A “B” in the Initial Activities Column indicates that the control measure shall be installed before construction activity starts. Locations and quantities will be discussed during the Environmental Pre-Construction Conference with the

Regional Water Pollution Control Manager.

STRUCTURAL Control Measures that may be potentially used on the project for erosion and sediment control; practices may include, but are not limited to:

APPLICATION,

CONTROL MEASURE NARRATIVE

M- 208 STANDARD or “X” for NON-

STANDARD

IN USE

ON

SITE

CONTROL MEASURE IMPLEMENTATION PHASE

INITIAL ACTIVITIES

INTERIM

ACTIVITIES

PERMANENT

STABILIZATION

PROTECTION OF EXISTING WETLANDS

Fence (plastic) and erosion logs

Fence (plastic) shall be placed in combination with erosion logs to prevent encroachment of construction traffic and sediment into state waters prior to start of construction disturbances. Fence (plastic) shall be placed adjacent to the wetlands; erosion logs shall be placed between the plastic fence and disturbance area. Logs shall be placed to direct flows away from or filter water running into wetlands from disturbance areas.

PROTECTION OF EXISTING TREES/LANDSCAPING

Fence (plastic)

Fence (plastic) shall be used in areas indicated in the plans to prevent encroachment of construction traffic and sediment for the protection of mature trees and/or existing landscaping prior to start of construction disturbances.

CHECK DAM/DITCH CHECK

Erosion log, silt berm, silt dike, rock check dam

Placed in ditches immediately upon completion of ditch grading to reduce velocity of runoff in ditch.

For existing ditches, place prior to start of construction disturbances. M-208

Storm Drain Inlet Protection In Paved Roadways (Type 1, 2 and 3 as shown on M-208-1, sheet 5 of 11)

Manufactured storm drain inlet protection placed prior to construction disturbances as detailed in M- 208-1, to protect existing inlets or immediately upon completion of new inlets to prevent sediment from entering the inlet throughout construction.

M-208

Storm Drain Inlet Protection In Native Seed Areas (M-604 Standard Inlets Type C and D)

Erosion logs or aggregate bags placed around inlet grate to prevent sediment from entering inlet.

Place prior to construction disturbances to protect existing inlets or immediately upon completion of new inlets.

M-208

CULVERT INLET/OUTLET PROTECTION

Erosion logs, aggregate bags

Placed at mouth of culvert inlets and over top of culvert at inlet and outlet where disturbance may be occurring adjacent to pipe to prevent sediment laden water from entering pipe or drainage. Place prior to start of construction disturbances.

M-208

TYPE C, TYPE D AND TYPE 13 PROTECTION

Erosion logs, aggregate bags, erosion bales

Placed around inlet grate or slope and ditch paving to prevent sediment from entering inlet. Place prior to start of construction disturbances. M-208 X X

STOCKPILE PROTECTION

Temporary berm, erosion logs, aggregate bags*

Placed within specified distance, in accordance with subsection 208.06, from toe to contain sediment around stockpile. *Aggregate bags are easily moved and replaced for access during the work day.

Place prior to start of stockpile, increase control as stockpile increases size.

M-208 X

TOE OF FILL PROTECTION

Erosion logs, temporary berm, silt fence, topsoil windrow*

Place prior to slope/embankment work to capture sediment and protect and delineate undisturbed areas. *Can be used to stockpile topsoil for salvage. M-208

PERIMETER CONTROL

Erosion logs, silt fence, temporary berm, topsoil windrow*

Placed prior to construction commencing to address potential run-on water from off site, and to divert around disturbed area. *Can be used to stockpile topsoil for salvage. M-208

SLOPE CONTROL

Silt fence, erosion logs

Placed on the contour of a slope to contain and slow down construction runoff. Place prior to start of construction disturbances. M-208

TEMPORARY SEDIMENT TRAP

Used to capture sediment laden runoff from disturbed areas < 5 acres during construction. Place prior to start of construction disturbances. Outlets that withdraw water from or near the surface may be installed when discharging from basins and impoundments.

M-208

TEMPORARY SLOPE DRAIN Placed as a conduit or chute to drain runoff down slope and to prevent erosion of slope. M-208 OUTLET PROTECTION Material placed as energy dissipater to prevent erosion at outlet structure. M-601-12

CONTROL MEASURE NARRATIVE

M- 208 STANDARD or “X” for NON-

STANDARD

IN USE

ON

SITE

CONTROL MEASURE IMPLEMENTATION PHASE

INITIAL ACTIVITIES

INTERIM

ACTIVITIES

PERMANENT

STABILIZATION

Riprap, or approved other

CONCRETE WASHOUT

In-ground or fabricated

Construction control, used for waste management of concrete and concrete equipment cleaning.

Place prior to start of concrete activities. M-208

VEHICLE TRACKING PAD Source control, placed to prevent tracking of sediment from disturbed area to offsite surface. Place prior to start of construction disturbances. M-208

Engineered SEDIMENT BASIN

Constructed early in project, prior to storm sewer/ditches and in accordance with 208.05(p) to capture storm flow. Outlet structure and/or outfall shall be modified for temporary sediment control using an approved non-standard detail. Outlets that withdraw water from or near the surface shall be installed when discharging from basins and impoundments, unless infeasible

DEWATERING

(Contractor is responsible for obtaining a permit from Colorado Department of Health and Environment.)

Shall be done in such a manner to prevent potential pollutants from entering state waters.

TEMPORARY STREAM CROSSING

Constructed over stream or drainage to prevent discharge of pollutants from construction equipment into water.

CLEAN WATER DIVERSION

Placed to divert clean surface or ground water around disturbance area to prevent it from mixing with construction runoff.

OTHER

NON-STRUCTURAL Control Measures that may be potentially used on the project for erosion and sediment control; practices may include, but are not limited to:

Erosion control devices are used to limit the amount of soil loss on site. Sediment control devices are designed to capture sediment on the project site.

CONTROL MEASURE NARRATIVE

M-STANDARD

or “For NON-

STANDARD

IN USE

ON SITE

CONTROL MEASURE IMPLEMENTATION PHASE

INITIAL ACTIVITY INTERIM

ACTIVITIES

PERMANENT

STABILIZATION

VEGETATIVE BUFFER STRIP Finishing component for filtering sediment-laden runoff from disturbance area. Area within CDOT ROW or temporary easement to be identified on SWMP prior to construction starting.

GRADING APPLICATIONS (LANDFORM)

Existing or created landforms may be used as a control measure if they prevent sediment from entering or leaving the disturbance area. If a landform directs flow of water to a concentrated outfall point, the outfall point shall be protected to prevent erosion. Area to be identified on SWMP prior to construction starting.

M-208

TOPSOIL MANAGEMENT STOCKPILE/SALVAGE

Stockpile

Prior to any site disturbance work commencing, existing topsoil shall be scraped to a depth four inches or as specified, and placed in stockpiles or windrows. Upon completion of final grading, topsoil shall be evenly distributed over embankment to a depth of four inches or as specified.

M-208

SURFACE ROUGHENING / GRADING TECHNIQUES Temporary stabilization of disturbance and to minimize wind and erosion.

SEEDING (TEMPORARY) Temporary stabilization used for over wintering of disturbance or used to control erosion for areas scheduled for future construction.

BONDED FIBER MATRIX or MULCHING (HYDRAULIC) Not to be used in areas of concentrated flows, i.e. ditch lines. To be for either Interim or Permanent Stabilization placed as a surface cover for erosion control. May be used as surface cover when work is temporarily halted and as approved by the Engineer for stockpiles.

Straw or Hay MULCH/MULCH TACKIFIER Interim or Permanent Stabilization placed as a surface cover for erosion control and or seeding establishment. To be installed as Interim Stabilization as a surface cover when work is temporarily halted and as approved by the Engineer

SPRAY-ON MULCH BLANKET (Not to be used in areas of concentrated flows, i.e. ditch lines.)

Interim or Permanent Stabilization placed as a surface cover for erosion control and or seeding establishment. To be installed as temporary surface cover when work is temporarily halted and as approved by the Engineer

SEEDING PERMANENT (NATIVE) Permanent Stabilization of disturbance and to reduce runoff and control erosion on disturbed areas.

SOIL RETENTION BLANKET (SRB) Permanent Stabilization of disturbance and to reduce runoff and control erosion on disturbed areas. M-216

TURF REINFORCEMENT MAT (TRM) Permanent Stabilization of disturbance and to reduce runoff and control erosion on disturbed areas.

Placed in channels or on slopes for erosion control, channel liner and seeding establishment. M-216

Sweeping Source control, used to remove sediment tracked onto paved surfaces and to prevent sediment from entering drainage system. Sweep daily and at the end of the construction shift as needed. Kick brooms shall not be permitted.

OTHER Hardscape installation X

9. TABULATION OF STORMWATER QUANTITIES

1. Control Measure sediment removal and disposal shall be paid for as: 208 Removal and Disposal of

Sediment (Equipment) and 208 Removal and Disposal of Sediment (Labor). All other control measure maintenance shall be included in the cost of the control measure.

PSP

Spec.

Pay Item Description Pay Unit Initial Const.

Interim Const.

Permanent Stabilization

*Total Quantity

208-00035 Aggregate Bag LF 10 10

208-00103 Removal and Disposal of Sediment (Labor)

Hour 1 1

208-00107 Removal of Trash Hour 1 1

*It is anticipated that additional control measures and control measure quantities not shown on the SWMP Site Maps shall be required on the project for unforeseen conditions and replacement of items that are beyond their useful service life, see subsections 208.03 and 208.04. Quantities for all control measures shown above are estimated, and have been increased for unforeseen conditions and normal control measure life expectancy.

Quantities shall be adjusted according to the conditions encountered in the field as directed and approved by the Engineer. Payment shall be for the actual work completed and material used.

**Pay Item 208-00071 is included for anticipated maintenance of vehicle tracking pads based on the service life of the control measure in the field. The use of the material shall be directed and approved by the Engineer.

*** Using Erosion Control Management Pay Item on the project must be approved by the Regional Environmental Staff and Engineer. See 208.11 for method of measurement for the day pay unit.

**** F/A refers to CDOT’s Force Account Pay Items.

10. BIOLOGICAL IMPACTS and DEWATERING

A. ENVIRONMENTAL IMPACTS:

Wetland Impacts: NO Stream Impacts: NO Threatened and Endangered Species: NO

B. DEWATERING:

(Not covered under the CDPHE guidance document Low Risk Discharge Guidance Discharges of Uncontaminated Groundwater to Land):

https://www.colorado.gov/pacific/sites/default/files/WQ%20LOW%20RISK%20GW.pdf Dewatering: Refer to other environmental permits in accordance with subsection 107.02 and the permits contained in Tab 16 of the SWMP.

If groundwater does not meet water quality standards for receiving water a separate CDPS Dewatering Permit shall be obtained by the Contractor from CDPHE in accordance with subsections

107.02 and 107.25.

11. NOTES

Trench SWMP - Initial CMs Arriba Rest Area Arriba, CO

Legend

Aggregate bags Surface flow direction

Limits of disturbance

(LDA)

Construction site