Sedgwick - Advertisement - Appendix M - Stormwater Management Plan.pdf

Template Revised: 2.25.2022

SWMP TEMPLATE (PLAN SHEETS) FOR PROJECTS WITH 1 ACRE OR MORE OF DISTURBANCE 2/25/2022 UPDATE

1. SITE DESCRIPTION

The Contractor shall comply with all CDOT contractual requirements, and all requirements associated with the CDPS-SCP on this project. The SWMP Administrator for Construction shall update the SWMP to reflect current project site conditions.

A. PROJECT SITE LOCATION:

Location or address of construction office:

10841 Highway 59 Sedgwick, Colorado 80749

B. PROJECT SITE DESCRIPTION:

The scope of this project consists of grading the empty lot to accommodate the new construction. A building with 9 bays will be constructed as well as a sand shed. The side will include 6 mag chloride tanks, 2 1000-gallon propane tanks, a bulk fuel station, a septic tank with leach field, and a well. The parking lot and areas around the building will be asphalt and there will be 2 drive entrances to the site. A stormwater detention pond will be on the northeast side of the side to capture the runoff from the entire site.

C. PROPOSED SCHEDULE FOR SEQUENCE FOR MAJOR CONSTRUCTION ACTIVITIES:

Stabilize all areas that are not paved or landscaped through establishment of vegetation cover.

Before any construction takes place, there will be erosion control measures in place to ensure there is no construction debris entering downstream waters. These measures will consist of silt fencing and vehicle tracking pads. Clearing, grubbing, and grading of the entire site will be completed first. After the site is completely graded, construction of the new building will take place as well as asphalt/concrete placed in respective places. After construction activities are done, the site will be cleaned up and the erosion control measures will be removed. Permanent erosion control devices will remain.

D. ACRES OF DISTURBANCE:

1. Total area of construction site (LOC (PERMITTED AREA)): 6.51 acres

2. Total area of proposed disturbance (LDA): 4.08 acres

3. Total area of seeding: 1.71 acres

4. Total area of pre-project impervious surface: 0 sq. ft.

5. Total area of final impervious surface: 103,181 sq. ft.

E. EXISTING SOIL DATA:

According to the USDA Web Soil Survey, the proposed project site is made up of 100% A geotechnical report was also conducted on the site and the results showed approximately 19 to 24 feet of comparatively loose, low moisture, low density sand soils with variable amounts of silt, clay, and gravel over siltstone/claystone bedrock.

Bedrock was encountered below the overburden soils in some of the borings at depths of approximately 19 to 24 feet below existing site grades. Groundwater was not observed during the testing.

Data Source(s): Web Soil Survey website, Terracon Geotechnical Report (May 6, 2024)

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: Percent Existing Vegetative Cover:

Description of existing vegetation:

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

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: N/A

G. POTENTIAL POLLUTANTS SOURCES:

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.

H. DRAINAGE PATTERNS AND RECEIVING WATER(S):

1. Description of drainage patterns from the Site:

All drainage from the site runs to the northeast side where it is captured in a stormwater detention pond area.

This will then drain out to the northeast into the roadside ditch. This ditch runs alongside the road until it hits the South Platte River.

2. Names of immediate and ultimate receiving water(s) on site:

Receiving waters – South Platte River

3. Description of all stream crossings located within the Construction Site Boundary:

There are no stream crossings located within the construction site boundary.

I. ALLOWABLE NON-STORMWATER DISCHARGES:

The project site does not have any anticipated sources of non-stormwater discharge.

J. DIVERSION CRITERIA:

1. Is a diversion planned for the Site? Yes ______ No __X___.

2. If yes, complete information below:

a. What is the 2-year peak flow for the waterway being diverted (cubic feet per second)?

b. What are the monthly averages if available? (provide averages for Jan- Dec if available)

c. What is the upstream contributing drainage area and imperviousness?

d. A method statement must be prepared by the Contractor and approved by CDOT for each diversion. Diversion structures must minimize soil transport and erosion within the entire diversion, minimize erosion during discharge, and minimize run-on into the diversion and meet the conditions in the SCP.

e. If the conditions in the SCP cannot be met and an alternative is required, CDOT must approve the alternative and then it must be submitted and approved by CDPHE’s Water Quality Control Division prior to implementation.

K. ALTERNATIVE TEMPORARY STABILIZATION SCHEDULE:

[If applicable, provide a description of the alternative temporary stabilization schedule. If temporary stabilization exceeds the 14-day schedule, then the SWMP must document the constraints necessitating the alternative schedule, provide the alternative schedule, and identify all the locations where the alternative schedule is applicable on the site map.

Alternative temporary stabilization schedules must be approved by CDOT prior to implementation]

2. SITE MAP COMPONENTS:

Pre-construction

A. PROJECT CONSTRUCTION POTENTIAL SITE BOUNDARIES:

See SWMP site maps.

B. FLOW ARROWS THAT DEPICT STORMWATER FLOW DIRECTIONS ON-SITE, RUN-ON AND RUNOFF

DIRECTION:

C. ALL AREAS OF GROUND SURFACE DISTURBANCE:

D. AREAS OF CUT AND FILL:

E. AREAS USED FOR STORING AND STOCKPILING OF MATERIALS, STAGING AREAS (field trailer, fueling, etc.) and LOCATIONS OF ALL WASTE ACCUMULATION and BATCH PLANTS INCLUDING MASONRY

MIXING STATIONS:

F. LOCATION OF ALL STRUCTURAL CONTROL MEASURES IDENTIFIED IN THE SWMP:

G. LOCATION OF NON-STRUCTURAL CONTROL MEASURES AS APPLICABLE IN THE SWMP:

H. SPRINGS, STREAMS, WETLANDS, DIVERSIONS, AND OTHER STATE WATERS, INCLUDING AREAS THAT

REQUIRE PRE-EXISTING VEGETATION BE MAINTAINED WITHIN 50 FEET OF A RECEIVING WATER:

I. LOCATIONS OF ALL STREAM CROSSING LOCATED WITHIN THE CONSTRUCTION SITE BOUNDARY:

The project contains no streams crossing within the construction site boundary.

J. PROTECTION OF TREES, SHRUBS, SENSITIVE HABITAT, AND CULTURAL RESOURCES:

The project contains no trees, shrubs, sensitive habitat, or cultural resources.

K. LOCATIONS WHERE ALTERNATIVE TEMPORARY STABILIZATION SCHEDULES APPLY:

The project contains no temporary stabilization schedules.

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 #

Jessica Paswaters, Civil Engineer (970)818-8999 Jessica.Paswaters@clarkenersen.com 8374771E

B. SWMP ADMINISTRATOR FOR CONSTRUCTION: (As defined in Section 208) The Contractor shall designate a

SWMP Administrator for Construction upon accepting co-permittee of the permit. 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) (A copy of TECS Certification must be included in the SWMP.)

Name/Title Contact Information (phone & email) Certification # Start Date Engineer Approval

C. EROSION CONTROL INSPECTOR: (As defined in Section 208) The Contractor may designate an Erosion

Control Inspector. The Erosion Control Inspector shall complete duties in accordance with subsection 208.03

(c) (Copy of TECS Certification must also be included in the SWMP.)

Name/Title Contact Information (phone & email)

TECS

Certification # Start Date Engineer Approval

D. 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 [phone & email]

4. STORMWATER MANAGEMENT CONTROLS FOR FIRST CONSTRUCTION ACTIVITIES

THE CONTRACTOR SHALL PERFORM THE FOLLOWING:

A. POTENTIAL POLLUTANT SOURCES:

Evaluate, identify, locate and describe all potential sources of pollutants at the site in accordance with subsection 107.25, CDPS-SCP and place in the SWMP. All control measures related to potential pollutants shall be shown on the SWMP Site Map by the Contractor’s SWMP Administrator for Construction.

B. OFFSITE DRAINAGE (RUN ON WATER):

Describe and record control measures on the SWMP Site Map that have been implemented to address off site run-on water in accordance with subsection 208.03.

C. VEHICLE TRACKING CONTROL:

Control measures shall be implemented in accordance with subsection 208.04.

D. PERIMETER CONTROL:

1. 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 shall be in accordance with subsection 208.04

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

5. DURING CONSTRUCTION

RESPONSIBILITIES OF THE SWMP ADMINISTRATOR FOR CONSTRUCTION: Considered a “living document”, the SWMP is continuously reviewed and modified throughout the construction phases. During construction, SWMP Administrator for Construction shall add, update, or amend the items A-G below as needed in accordance with subsection 208.03.

During construction, indicate how items that were not addressed during design are being handled in construction.

If items are covered in other sections of the SWMP, indicate below what section the discussion takes place.

A. MATERIALS HANDLING AND SPILL PREVENTION AND RESPONSE PLAN: Prior to construction commencing the Contractor shall submit a Spill Response Plan. Materials handling and Spill Response Plan 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 washout 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.

6. INSPECTIONS

A. Water Quality Inspections shall be in accordance with subsection 208.03(c).

B. Permanent Stabilization Inspections shall be in accordance with subsections 208.04(e)4 and 208.10.

7. CONTROL MEASURE MAINTENANCE

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

8. RECORD KEEPING

Records shall be kept in accordance with subsection 208.03(d).

9. INTERIM, PERMANENT STABILIZATION and LONG-TERM STORMWATER MANAGEMENT

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

A. SEEDING PLAN:

The following seed mix(es) and rates are for drill seeding method as shown on the Permanent Stabilization Site Maps shall be used:

COMMON NAME BOTANICAL NAME LBS. PLS PER

ACRE

Mountain brome Bromus marginatus 7.0 Slender wheatgrass Elymus trachycaulus ssp. trachycaulus 4.5

Rocky Mountain fescue Festuca saximontana 3.0 Alpine bluegrass Poa alpina 0.5

Quickguard Triticum aestivum x Secale cereale 3.0 Blue flax Linum lewisii 0.5

Rocky Mountain Penstemon Penstemon strictus 0.1 Western yarrow Achillea millefolium var. occidentalis 0.1

Total 18.7

B. SEEDING APPLICATION METHOD:

The following seeding methods shall be used for all areas shown on the Permanent Stabilization Site Maps. Soil compaction shall be minimized for areas where permanent stabilization will be achieved through vegetative cover.

Pay Item Seeding Method (subsection 212.05) Acre 212-00708 Seeding (Native) Hydraulic 1.71

Total 1.71

C. SOIL STABILIZATION METHODS:

Minimum soil stabilization methods (attached mulch) for all disturbances to receive seeding.

1. Apply a minimum of 2 tons/ac certified weed free hay or 2 ½ tons/ac of certified weed free straw and mechanically crimp into the soil in combination with natural mulch tackifier in accordance with Section 213.

Prior to winter shutdown or the summer seeding window closure: Uncompleted slopes shall be mulched with 2 tons of mulching (weed free) per acre, mechanically crimped into the topsoil in combination with an organic mulch tackifier in accordance with Sections 208 and 213.

D. SPECIAL REQUIREMENTS:

1. Soil amendments, seedbed preparation, and permanent stabilization mulching shall be accomplished within four working days of placing the topsoil on the de-compacted civil subgrades. If placed topsoil is not mulched with permanent stabilization mulch within four working days, the Contractor shall complete interim stabilization methods in accordance with subsection 208.04(e) at no additional cost to the Department.

2. Complete permanent stabilization mulching within 24 hours of hydraulic application of native seed.

3. The Contractor shall submit a proposed Permanent Stabilization Phasing Plan to the Engineer for approval showing how implementation of SWMP Permanent Stabilization Plans will minimize damage to seeded areas.

E. SOIL AMENDMENT REQUIREMENTS: Minimum amendment material requirements for all disturbances to receive seeding.

The area of disturbance that is receiving seeding is a total of 1.1 acres. This total area includes the stormwater detention pond and leach field cover on the north side of the site and area on the south side of the site for snow pile and a shallow drainage swale. There is minimal seeding on the east and west to replace what was disturbed during construction.

1.71 Total Acres of Seeding (Native) Hydraulic (Pay Item 212-00708)

Pay Item Description Amount/Acre Units Total For This Method

212-00702 Biotic Soil Amendments (Hydraulically Applied) 3500 Pounds 5985

212-00704 Mycorrhizae 60 Pounds 103

F. 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.

G. RESEEDING OPERATIONS/CORRECTIVE STABILIZATION:

Prior to stormwater construction work partial acceptance.

1. All seeded areas shall be reviewed by the SWMP Administrator for Construction and or Erosion Control Inspector for bare soils caused by surface or wind erosion. Bare areas caused by surface or gully erosion, blown away mulch, etc. shall be re-graded, seeded, and have the designated mulching applied as necessary, at no additional cost to the project.

2. The Contractor shall maintain seeding/mulch/tackifier/blanket/TRM, mow to control weeds or apply herbicide to control weeds in the seeded areas, at no additional cost to the project.

H. LOCATION AND DESCRIPTION OF PLANNED PERMANENT CONTROL MEASURES: Is Permanent Water

Quality Required. Yes __X____ No ______.

A water quality detention basin and an outlet structure are located just north of the site where the asphalt paving ends.

10. PRIOR TO PROJECT FINAL ACCEPTANCE

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

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

C. All storm drains shall be cleaned prior to the Final Acceptance of the project. If required, include work in 202- 04002 Clean Culvert. [**Check with Region Water Quality staff to see if CLEAN CULVERT PSP is needed and what Pay Item to use.**]

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

11. 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 the following:

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 sensitive habitat, 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 the 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 the start of construction disturbances. M-208 B 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 stockpiling, increase control as the stockpile increases size.

M-208

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 B X

SLOPE CONTROL

Silt fence, erosion logs

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

TEMPORARY SEDIMENT TRAP

Used to capture sediment laden runoff from disturbed areas < 5 acres during construction. Place prior to the 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

Riprap, or approved other Material placed as an energy dissipater to prevent erosion at outlet structure. M-601-12 X

CONCRETE WASHOUT

In-ground or fabricated

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

Place prior to the start of concrete activities. M-208 X

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

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

Engineered SEDIMENT BASIN

Constructed early in the 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 groundwater around the 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. Construction controls are control measures related to construction access and staging. Control Measure locations are indicated on the SWMP Site Map.

* Use of vegetative buffer strip requirements. The CDPHE Water Quality Control Division Technical Memorandum dated August 27, 2015 clarifies the requirements for utilization of existing vegetation as a buffer type of sediment control measure, while maintaining compliance with the CDPS permit for Stormwater Discharges Associated with Construction Activity – CDPS Permit No. COR4000000. In general, the division does not recommend that vegetated buffers be implemented as a sediment removal control measure for runoff from disturbed areas at construction sites, unless implemented as a “finishing” component of a treatment train comprised of additional, adequate up-gradient Control Measures. The entire memorandum can be found at: https://www.colorado.gov/pacific/sites/default/files/Vegetative%20Buffer%20Memo.pdf

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 six 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 six 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

X X

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 PERENNIAL)

Permanent Stabilization of disturbance and to reduce runoff and control erosion on disturbed areas. X

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.

X X X

OTHER

https://www.colorado.gov/pacific/sites/default/files/Vegetative%20Buffer%20Memo.pdf

12. TABULATION OF STORMWATER QUANTITIES

A. 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

X 203-01500 Blading Hour

X 203-01550 Dozing Hour

X 203-01594 Combination Loader Hour

X 207-00700 Topsoil (Onsite) CY

X 207-00704 Subgrade Soil Preparation SY

X 208-00008 Erosion Log Type 2 (12 Inch) LF 100 100

X 208-00020 Silt Fence LF 1550 1550

X 208-00030 Sediment Basin Each 1 1

X 208-00046 Pre-fabricated Concrete Washout Structure (Type 1) Each 1 1

X 208-00075 Pre-fabricated Vehicle Tracking Pad Each 1 1

X 208-00103 Removal and Disposal of Sediment (Labor) Hour 45 45 10 100

X 208-00105 Removal and Disposal of Sediment (Equipment) Hour 45 45 10 100

X 208-00106 Sweeping (Sediment Removal) Hour 10 10 20 40

X 208-00107 Removal of Trash Hour 10 10 20

X 208-00207 Erosion Control Management (ECM) Day 45 45 10 100

X 212-00702 Biotic Soil Amendments (Hydraulic Applied) Pounds 5985 5985

X 212-00704 Mycorrhizae Pounds 103 103

X 212-00707 Seeding (Native) Hydraulic Acre 1.71 1.71

X 213-00012 Spray-on Mulch Blanket Acre 1.71 1.71

*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.

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

13. BIOLOGICAL IMPACTS and DEWATERING

A. ENVIRONMENTAL IMPACTS:

1. Wetland Impacts: NO

2. Stream Impacts: NO

3. Threatened and Endangered Species:

No species are anticipated to be impacted by the project.

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

1. Dewatering: Refer to other environmental permits in accordance with subsection 107.02 and the permits contained in Tab 16 of the SWMP.

2. 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.

14. NOTES

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

PROPOSED

BUILDING

FFE = 3668.0'

PROPOSED

SAND SHED

MAG CHLORIDE

TANKS (6)

WATER QUALITY BASIN

-2 .96

% -2 .28

-3.25%

-2.10%

-2.49%

-2.

% -1.88%

-4.98%

-1 .36

-1 .34

-1.46%

3667 3666

PROPOSED 5'

TYPE R INLET

PROPOSED 18"

STORM SEWER

PROPOSED 18"

STORM SEWER

PROPOSED 24" CULVERT

PROPOSED 5'

TYPE R INLET

PROPOSED 18"

STORM SEWER

CONCRETE PAD FOR

WASTE OIL CONTAINER

EXISTING FENCE

BULK FUEL TANK

20' CONCRETE APRON

20' CONCRETE APRON

PROPOSED

PROPANE TANKS (2)

SILT FENCE

SITE BOUNDARY - AREA OF GROUND

SURFACE DISTURBANCE AND LIMITS

OF CONSTRUCTION

FLOWLINE

FLOWLINE

FLOWLINE

PROPOSED 18" CULVERT (2)

EXISTING FENCE

PROPOSED FLOWLINE

SF

SF

SF

SF

SFSFSFSFSFSFSFSFSFSFSFSFSF

SF

SF

SF

SF

SF

SF

SF

SF

SF

SF

SF

SF

SF

SF

SF

SF

SF

SF SF SF SF SF SF SF SF SF SF SF SF

SF

SF

SF

SF

SF

SF

SF

SCALE: 1"=30'

INITIAL SWMP SITE MAP

PROPOSED CONTOUR

EXISTING CONTOUR

APPROXIMATE LIMITS OF GRADING

LEGEND

ITEM UNIT QUANTITY

CUT CY 7184

FILL CY 7115

NET CY 69

EARTHWORK

EROSION CONTROL - SILT FENCESF SF

FLOWLINE

0' 15' 30' 60'

DRAWN BY:

C&E PROJECT No.

531-004-24

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CDOT PROJECT No.

#22137

DRAWING NUMBER

In iti al S

W M

P Si te M ap

C3.02

ITEM UNIT QUANTITY

TOTAL AREA OF CONSTRUCTION SITE ACRE 6.51

TOTAL AREA OF PROPOSED DISTURBANCE

ACRE 4.08

SF 177,736

TOTAL AREA OF SEEDING ACRE 1.71

TOTAL AREA OF PRE-PROJECT IMPERVIOUS SURFACE ACRE 0

TOTAL AREA OF FINAL IMPERVIOUS SURFACE ACRE 2.37

DISTURBANCE

COMMON NAME BOTANICAL NAME LBS. PLS PER ACRE

MOUNTAIN BROME BROMUS MARGINATUS 7.0

SLENDER WHEATGRASS ELYMUS TRACHYCAULUS SSP. TRACHYCAULUS 4.5

ROCKY MOUNTAIN FESCUE FESTUCA SAXIMONTANA 3

ALPINE BLUEGRASS POA ALPINA 0.5

QUICKGUARD TRITICUM AESTIVUM X SECALE CEREALE 3.0

BLUE FLAX LINUM LEWISII 0.5

ROCKY MOUNTAIN PENSTEMON PENSTEMON STRICTUS 0.1

WESTERN YARROW ACHILLEA MILLEFOLIUM VAR. OCCIDENTALIS 0.1

TOTAL 18.7

SEED MIX

11/21/2024

AutoCAD SHX Text

CO-59

AutoCAD SHX Text 303-512-5550

AutoCAD SHX Text

FAX:

AutoCAD SHX Text 303-757-9011

AutoCAD SHX Text

PROPERTY MANAGEMENT

AutoCAD SHX Text

2829 W. HOWARD PL., FL 4

AutoCAD SHX Text %%UColorado Department of Transportation

AutoCAD SHX Text Phone:

AutoCAD SHX Text

DENVER, CO 80204

AutoCAD SHX Text %%UCDOT Sedgwick VSF & Sand Shed

AutoCAD SHX Text 10841 Highway 59

AutoCAD SHX Text Sedgwick, CO 80749

PROPOSED

BUILDING

FFE = 3668.0'

PROPOSED

SAND SHED

MAG CHLORIDE

TANKS (6)

WATER QUALITY BASIN

-2 .96

% -2 .28

-3.25%

-2.10%

-2.49%

-2.

% -1.88%

-5.19% -1

.36

-1 .34

-1.46%

3667 3666

EXISTING FENCE

CONCRETE PAD FOR

WASTE OIL CONTAINER

EXISTING FENCE

BULK FUEL TANK

20' CONCRETE APRON

20' CONCRETE APRON

PROPOSED

PROPANE TANKS (2)

SILT FENCE

SITE BOUNDARY - AREA OF GROUND

SURFACE DISTURBANCE AND LIMITS

OF CONSTRUCTION

FLOWLINE

FLOWLINE

FLOWLINE

CONCRETE

WASHOUT

VEHICLE TRACKING PAD

PROPOSED 5'

TYPE R INLET

PROPOSED 18"

STORM SEWER

PROPOSED 18"

STORM SEWER

PROPOSED 18" CULVERT (2)

PROPOSED 24" CULVERT

PROPOSED 5'

TYPE R INLET

PROPOSED 18"

STORM SEWER

SEDIMENT BASIN

PROPOSED FLOWLINE

IP

IP

IP

GRADING TREATMENT

EROSION LOG TOE OF

SLOPE PROTECTION

IP

IP

SF

SF

SF

SF

SFSFSFSFSFSFSFSFSFSFSFSFSF

SF

SF

SF

SF

SF

SF

SF

SF

SF

SF

SF

SF

SF

SF

SF

SF

SF SF SF SF SF SF SF SF SF SF SF SF SF

SF

SF

SF

SF

SF

SF

SF

EROSION LOG TOE OF

SLOPE PROTECTION

SCALE: 1"=30'

INTERIM SWMP SITE MAP

PROPOSED CONTOUR

EXISTING CONTOUR

APPROXIMATE LIMITS OF GRADING

LEGEND

ITEM UNIT QUANTITY

CUT CY 7184

FILL CY 7115

NET CY 69

EARTHWORK

EROSION CONTROL - SILT FENCESF SF

FLOWLINE

0' 15' 30' 60'

DRAWN BY:

C&E PROJECT No.

531-004-24

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CDOT PROJECT No.

#22137

DRAWING NUMBER

In te rim S

W M

P Si te M ap

C3.03

IP EROSION CONROL - INLET PROTECTION

INLET PROTECTION

ITEM UNIT QUANTITY

TOTAL AREA OF CONSTRUCTION SITE ACRE 6.51

TOTAL AREA OF PROPOSED DISTURBANCE

ACRE 4.08

SF 177,736

TOTAL AREA OF SEEDING ACRE 1.71

TOTAL AREA OF PRE-PROJECT IMPERVIOUS SURFACE ACRE 0

TOTAL AREA OF FINAL IMPERVIOUS SURFACE ACRE 2.37

DISTURBANCE

COMMON NAME BOTANICAL NAME LBS. PLS PER ACRE

MOUNTAIN BROME BROMUS MARGINATUS 7.0

SLENDER WHEATGRASS ELYMUS TRACHYCAULUS SSP. TRACHYCAULUS 4.5

ROCKY MOUNTAIN FESCUE FESTUCA SAXIMONTANA 3

ALPINE BLUEGRASS POA ALPINA 0.5

QUICKGUARD TRITICUM AESTIVUM X SECALE CEREALE 3.0

BLUE FLAX LINUM LEWISII 0.5

ROCKY MOUNTAIN PENSTEMON PENSTEMON STRICTUS 0.1

WESTERN YARROW ACHILLEA MILLEFOLIUM VAR. OCCIDENTALIS 0.1

TOTAL 18.7

SEED MIX

11/21/2024

AutoCAD SHX Text

CO-59

AutoCAD SHX Text 303-512-5550

AutoCAD SHX Text

FAX:

AutoCAD SHX Text 303-757-9011

AutoCAD SHX Text

PROPERTY MANAGEMENT

AutoCAD SHX Text

2829 W. HOWARD PL., FL 4

AutoCAD SHX Text %%UColorado Department of Transportation

AutoCAD SHX Text Phone:

AutoCAD SHX Text

DENVER, CO 80204

AutoCAD SHX Text %%UCDOT Sedgwick VSF & Sand Shed

AutoCAD SHX Text 10841 Highway 59

BUILDING

FFE = 3668.0'

SAND SHED

MAG CHLORIDE

TANKS (6)

WATER QUALITY BASIN

-2 .96

% -2 .28

-3.25%

-2.10%

-2.49%

-2.

-1.88%

-5.19% -1

.36

-1 .34

-1.46%

3667 3666

5' TYPE R INLET

18" STORM SEWER

18" STORM SEWER

18" CULVERT (2)

24" CULVERT

5' TYPE R INLET

18" STORM SEWER

EXISTING FENCE

CONCRETE PAD FOR

WASTE OIL CONTAINER

EXISTING FENCE

BULK FUEL TANK

20' CONCRETE APRON

20' CONCRETE APRON

PROPANE TANKS (2)

SITE BOUNDARY - AREA OF GROUND

SURFACE DISTURBANCE AND LIMITS

OF CONSTRUCTION

FLOWLINE

FLOWLINE

FLOWLINE

FLOWLINE

RIP RAP PAD

RIP RAP PAD

RIP RAP PAD

RIP RAP PAD

SCALE: 1"=30'

FINAL SWMP SITE MAP

PROPOSED CONTOUR

EXISTING CONTOUR

APPROXIMATE LIMITS OF GRADING

LEGEND

ITEM UNIT QUANTITY

CUT CY 7184

FILL CY 7115

NET CY 69

EARTHWORK

FLOWLINE

0' 15' 30' 60'

DRAWN BY:

C&E PROJECT No.

531-004-24

D

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E N o.

D

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C

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CDOT PROJECT No.

#22137

DRAWING NUMBER

Fi na l S W

M P

Si te

M ap

C3.04

ITEM UNIT QUANTITY

TOTAL AREA OF CONSTRUCTION SITE ACRE 6.51

TOTAL AREA OF PROPOSED DISTURBANCE

ACRE 4.08

SF 177,736

TOTAL AREA OF SEEDING ACRE 1.71

TOTAL AREA OF PRE-PROJECT IMPERVIOUS SURFACE ACRE 0

TOTAL AREA OF FINAL IMPERVIOUS SURFACE ACRE 2.37

DISTURBANCE

COMMON NAME BOTANICAL NAME LBS. PLS PER ACRE

MOUNTAIN BROME BROMUS MARGINATUS 7.0

SLENDER WHEATGRASS ELYMUS TRACHYCAULUS SSP. TRACHYCAULUS 4.5

ROCKY MOUNTAIN FESCUE FESTUCA SAXIMONTANA 3

ALPINE BLUEGRASS POA ALPINA 0.5

QUICKGUARD TRITICUM AESTIVUM X SECALE CEREALE 3.0

BLUE FLAX LINUM LEWISII 0.5

ROCKY MOUNTAIN PENSTEMON PENSTEMON STRICTUS 0.1

WESTERN YARROW ACHILLEA MILLEFOLIUM VAR. OCCIDENTALIS 0.1

TOTAL 18.7

SEED MIX

11/21/2024

AutoCAD SHX Text

CO-59

AutoCAD SHX Text 303-512-5550

AutoCAD SHX Text

FAX:

AutoCAD SHX Text 303-757-9011

AutoCAD SHX Text

PROPERTY MANAGEMENT

AutoCAD SHX Text

2829 W. HOWARD PL., FL 4

AutoCAD SHX Text %%UColorado Department of Transportation

AutoCAD SHX Text Phone:

AutoCAD SHX Text

DENVER, CO 80204

AutoCAD SHX Text %%UCDOT Sedgwick VSF & Sand Shed

AutoCAD SHX Text 10841 Highway 59

C6.02

C on st ru ct io n D et ai ls

DRAWN BY:

C&E PROJECT No.

531-004-24

D

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E N o.

D

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IP

TI

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CLARK & ENERSEN

/0

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N

CDOT PROJECT No.

#22137

DRAWING NUMBER

11/21/2024

AutoCAD SHX Text 303-512-5550

AutoCAD SHX Text

FAX:

AutoCAD SHX Text 303-757-9011

AutoCAD SHX Text

PROPERTY MANAGEMENT

AutoCAD SHX Text

2829 W. HOWARD PL., FL 4

AutoCAD SHX Text %%UColorado Department of Transportation

AutoCAD SHX Text Phone:

AutoCAD SHX Text

DENVER, CO 80204

AutoCAD SHX Text %%UCDOT Sedgwick VSF & Sand Shed

AutoCAD SHX Text 10841 Highway 59

C6.03

C on st ru ct io n D et ai ls

DRAWN BY:

C&E PROJECT No.

531-004-24

D

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E N o.

D

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C

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IP

TI

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CLARK & ENERSEN

/0

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CDOT PROJECT No.

#22137

DRAWING NUMBER

11/21/2024

AutoCAD SHX Text 303-512-5550

AutoCAD SHX Text

FAX:

AutoCAD SHX Text 303-757-9011

AutoCAD SHX Text

PROPERTY MANAGEMENT

AutoCAD SHX Text

2829 W. HOWARD PL., FL 4

AutoCAD SHX Text %%UColorado Department of Transportation

AutoCAD SHX Text Phone:

AutoCAD SHX Text

DENVER, CO 80204

AutoCAD SHX Text %%UCDOT Sedgwick VSF & Sand Shed

AutoCAD SHX Text 10841 Highway 59