HomeMy WebLinkAbout11.0 Stormwater Plan 20195tormtvater Management
plan
Elam Construction, Sand & Gravel
5 -/Mile Ranch Pit
(CDPHE WQCD Permit No. 500000) Certification # C0G501617
(DRMS Permit No. M2016026)
October 7th, 2019
Elam Construction, Sand & Gravel
Jim Doody, Environmental Compliance Manager
Phone: (970) 712-6634
Email: jim.doody@elamconstruction.com
TABLE OF CONTENTS
I. Purpose 1
II. Site 1
III. Site Overview 1
A. Location 1
B. Description 1
C. Adjacent Land 1
D. Soils 1
E. Receiving and Other Waters 2
IV. Site Activities and Phasing 2
A. Site Activities 2
B. SWMP Administrator 2
V. Potential Pollutants 3
VI. Pollution Prevention Measures 4
A. Waste Management and Disposal 4
B. Non-stormwater Controls 4
C. Stormwater Controls (BMPs) 7
VII. Inspection and Maintenance Procedures 7
VIII Access to Plan and Paper Trail 7
IX. References 8
II
I. Purpose
The purpose of this Stormwater Management Plan is to prevent the pollution of stormwater. This
plan includes measures to reduce erosion and pollutant loads from the site. Potential pollutant
sources, locations, and controls are discussed and the implementation, maintenance, and
inspection of said controls.
I1. Site
Elam Construction has a sand and gravel mining operation located in Garfield County west of
County Road 300, north of the Colorado River, and south of Highway 6.
III. Site Overview
A. Location
Access to the site is by Garfield County Road 300 just south of Highway 6 and the Railroad
tracks. A parcel of land situated in SE1/4 SE1/4 of section 28 and in Section 33, Township 7
South, Range 96 West of the Sixth Principal Meridian, County Of Garfield, State Of
Colorado.
B. Description
The topography of the site is flat with an overall slope of 1-5% to the south towards the
Colorado River. Existing land use is mining. Current cover conditions are primarily vegetated
areas with limited disturbed area. There are no visible erosion issues on-site, adjacent to the
site, and downstream of the site.
C. Adjacent Land
Land adjacent to the site is also zoned as Rural or Agricultural, some locations being used
as light industrial or commercial areas. Cover conditions adjacent to the site mostly consist
of undeveloped desert and fallow irrigated land. The basins adjacent to the site ultimately
drain south to the Colorado River.
D. Soils
The surface soils for this site are being mined. Accordingly any hydrologic calculations
should assume group D (high runoff potential). The soils being mined are mostly sand and
gravel, which do not have a high potential for erosion. Erosion is not expected to be an issue
on-site because the site will use retention and the majority disturbed surfaces will be
compacted from traffic loads.
The depth to groundwater is unknown. However, given the proximity to the Colorado River it
is likely very shallow.
E. Receiving and Other Waters
The site drains to one on-site retention pond or also known as the pit. This retention pond
will in the event of a flood have an outlet Flow Structure. Typically water leaves the pond via
evaporation and infiltration to the aquifer. The pond may be pumped down/dewatered if
mining conditions require it. The pump discharge from the detention pond goes into the
Colorado River. The attached BMP Map shows the location of the future pond and the
detention pond (sediment pond) and the pump and river discharge.
This retention pond is within the 100 year floodplain of the Colorado River, so under high
flow conditions this area may be flooded. The Garfield County GIS website shows portions of
the property within mapped 100 year floodplain. The site does not receive irrigation water.
There are wetlands on this site in the southern portion of the property. They have been
delineated and will remain as in the condition they are currently in.
IV. Site Activities and Phasing
A. Site Activities
The Sand and Gravel Pit produces products such as sand, gravel, and washed sand and
gravel. Specific activities occurring on-site are:
• Mining of sand and gravel.
• Groundwater dewatering activities.
• Screening and crushing of materials.
• Washing of sand and gravel.
B. SWMP Administrator
The SWMP Administrator will be in charge of the overall daily operations at the site and will
have the authority to control all stormwater BMPs activities. The SWMP Administrator will be
the responsible person in regards to Stormwater Pollution Prevention and Management.
Name: Jim Doody
Company & Title: Environmental Compliance Manager
Phone: 970-712-6634
2
V. Potential Pollutants
Generate general table with the following columns: pollutant; source(s); potential controls to
manage pollutant; check box to be checked if present
Pollutant
Potential Sources
BMPs for Pollutant
Is Pollutant on-site
Sediment
Erosion of exposed
soil, dust, streams,
stockpiles, vehicle
tracking, etc.
Street Sweeping,
Sediment Basin, Silt
Fence, Silt Berm,
Check Dams, etc.
Yes
Chemicals
Poor storage and
handling of materials,
spills, illegal dumping,
pesticide application,
etc.
Spill Prevention,
Control, and Counter
Measures, SOPs for
loading & cleanout
Potentially
Nutrients & Bacteria
Fertilizers, leaking
sewer, decaying plant
and animal waste,
etc.
Proper handling and
application of
fertilizers; Spill
Prevention, Control,
and Counter
Measures
Potentially
Oxygen Demand
Sediment, nutrients,
organics, and other
pollutants as particles
and soluble phase
See BMPs for
pollutants above
Potentially
Oil and Grease
Streets, highways,
parking lots,
equipment fueling &
maintenance, illegal
dumping, atmospheric
deposition etc.
Street Sweeping, Spill
Prevention, Control,
and Counter
Measures,
Yes
Litter/Trash
Human Activities
Waste Management
and Disposal
Yes
Metals
Streets, highways,
parking lots, building
materials, recyclable
materials, industrial
activities, atmospheric
deposition, etc.
Street sweeping, Spill
Prevention, Control,
and Counter
Measures
Yes
Elevated Water
Temperatures
Sunlight, removal of
vegetation,
impervious areas,
shallow storage of
water, etc.
Proper maintenance
of BMPs
Potentially
Concrete Wash-out
Waste Water
Washing out of
concrete trucks and
concrete tools
Installation of a
concrete wash-out
area
Yes
3
VI. Pollution Prevention Measures
Stormwater pollution prevention measures can be categorized as follows:
1. Preventing contact between stormwater and the pollutant.
2. Preventing transport of the pollutant by stormwater.
3. Treatment to remove pollutants from stormwater.
These measures are listed in order according to effectiveness and priority. Obviously if the
stormwater does not come into contact with a pollutant, it can not become contaminated with
the pollutant. Second, if the stormwater contacts the pollutant and the pollutant does not
suspend or dissolve into the stormwater, the stormwater will remain uncontaminated. The best
way to protect the soil surface and limit erosion is to preserve existing vegetative cover.
Unfortunately, even with our best efforts stormwater will likely become contaminated with
pollutants from the site. This is because by nature of the project portions of the site will be
disturbed. Accordingly, efforts will be put in place to facilitate the removal of some of these
pollutants from stormwater. This is especially true prior to discharge from the site, but most
effective if done in series to ensure the pollutant levels never reach high levels and so the
perimeter controls are not the only defense, but instead the last line of defense.
A. Waste Management and Disposal
Re -use and recycle whenever possible. Salvage and recycle bins and/or containers will be
used if the supply of recyclable materials warrants their use. Recyclable materials should be
covered (i.e., placed in bins/containers with lids) to prevent contact with stormwater.
Trash containers, dumpsters, and/or roll -offs will be located on-site. These containers must
have lids to prevent contact between stormwater and trash. Further, these containers should
not have holes to allow liquid trash to leak/spill on the ground. A local company specializing
in the collection and disposal of waste material will be utilized. Their responsibilities will
include supplying and resupplying the site with containers, removing full containers from the
site, proper transport and disposal of waste material to a facility accepting said waste.
B. Colorado River Flood Stage Preparation
Monitoring weather reports from NOAA is essential and will be key to being proactive to an
upcoming event. Planning ahead of time will protect our employees, neighbors, equipment
and property. Increased monitoring and readiness will occur if it appears that a flood could
be a 20 year event. In the case of a predicted 50 year flood event mining operations will
cease. All the mining equipment that is in the pit is portable. This includes crushers,
screens, fuel tanks, generators, loaders, dozers excavators and sanitation facilities. They
will be moved to high ground outside the flood plain in preparation for the event. Since there
are no structures within the mine pit area, the flood would simply be allowed to enter the pit.
4
Once the flood subsides and the water can be pumped cleanly, dewatering would resume.
Any storage provided by the pit would actually serve to lower the peak flow downstream and
possibly prevent damage to properties. All discharges from pumping water will be regulated
under a combined stormwater/process water permit that is approved by CDPHE. If water
quality is out of compliance, water will not be discharged until it is in compliance.
C. Non-stormwater Controls
Non-stormwater controls are a critical part of stormwater pollution prevention. The goal of
non-stormwater controls is to prevent stormwater contact with potential pollutants. A list of
spill prevention, control, and counter measures have been developed as part of the
Stormwater Pollution Prevention Plan with this goal in mind.
Spill Prevention, Control, and Counter Measures to be used at this site include, but are not
limited to:
5
Equipment Storage, Fueling, and Maintenance
Equipment shall be well maintained and in good working condition. This means it should be
free of leaks and kept clean. Equipment should be stored on compacted level ground.
Fueling of equipment shall occur in a designated area for said activity and shall follow
applicable SOP and SPCC procedures. A spill kit shall be present and the operator shall be
trained and knowledgeable in the spill kits use.
Spill Reporting, Containment, and Cleanup
All federal (e.g., EPA, OSHA), state, and local regulations and laws apply. Proper training,
notification, PPE, procedures, handling, disposal, etc. are the responsibility of Elam
Construction.
Material Safety Data Sheets (MSDSs) for all materials brought on-site shall be kept in a
common binder. The binder is to be on-site at all times and everyone on-site is to know the
location of the binder. MSDS sheets contain important handling, storage, transport, health
and safety, and cleanup information about the materials.
In the event of a spill the proper authorities shall be notified immediately, work shall stop in
the immediate area of the spill, and the MSDS for that material should be consulted for
health and safety, containment, and cleanup procedures. The spill will be properly cleaned
up by qualified personnel and disposed of properly. A paper trail will document the entire
proceeding and all applicable regulations and/or laws will be followed and adhered to.
Material Storage and Handling
Covered storage shall be used whenever possible. Chemicals, paints, and other
containerized materials will always be stored under cover and under the conditions noted on
the MSDS and/or by the manufacture. All storage areas shall be outside of concentrated
drainage pathways on compacted level ground.
Materials shall be handled and applied according to the MSDS and manufacture's
recommendations. Every effort should be made to prevent spills, leaks, etc.
Education/Training
The purpose of this plan is not to hinder or interfere with work at this facility, but instead to
improve, complement, and enhance the overall product. Everyone working on the site should
read this plan to ensure "bottom-up" knowledge of the plan. Workers may have suggestions
based on their experience at other sites and projects. These suggestions should be brought
to the attention of the SWMP Administrator, who at their discretion may modify this plan
accordingly. Training topics should include, but are not limited to, spill prevention and
response, house keeping, and BMP maintenance.
A paper trail documenting all training shall be kept with this report.
Plan Enhancement
This plan is intended to be a "living document" and it is expected that it will be modified and
updated as needed. The purpose of these changes is to continuously improve and tailor the
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plan to the site and to keep up with any changes that occur on-site. These
modifications/updates will be documented in writing within the copy of the original plan
located on-site. The SWMP Administrator will be the person responsible for documenting
these changes.
D. Stormwater Controls (BMPs)
The main stormwater control/best management practice (BMP) for this facility is a retention
pond (pit). Other BMPs may be used by the SWMP Administrator if the need. Details for other
BMPs can be found in CDOT Standards and Denver's Urban Drainage and Flood Control
Manuals. If other BMPs are approved for use by the SWMP Administrator, they will be made
part of this document.
VII. Inspection and Maintenance Procedures
BMPs will be inspected at least 2 times a year (as per the CDPHE permit). The optimal time to
inspect BMPs is during rain events because the performance of the BMPs can be directly
observed. Inspections may occur during these events if practically possible.
The inspection will determine the stability and operation of the BMPs. The inspection will
document compliance, non-compliance, concerns, issues, corrective actions, and
changes/modifications. Repairs and adjustments to the system will be performed as soon as
possible. It may be necessary to adjust the BMPs used and their placement to best fit the site,
current conditions, and site activities. These adjustments may also be a result of BMP failure,
potential failure, or improved methodology.
VIII. Access to Plan and Paper Trail
A copy of this plan shall be kept on-site at all times. The on-site copy of this plan shall be
updated with changes and modifications by the SWMP Administrator. In addition to this plan the
following materials shall also be kept on-site:
• A copy of the CDPHE Stormwater Discharge Permit and Certification;
• A BMP map depicting the general direction of runoff, BMPs, outfalls,
sample locations, etc.
• Copies of completed SWPP Inspection Reports;
• Documentation of maintenance and corrective action activities; and
• Training (topics and sign -in sheets).
This plan and the materials above should be made available to the public for viewing upon
request.
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IX. References
1. 5-2-1 Drainage Authority Stormwater Management Plan (SWMP) template, April
29, 2009 version.
2. Certified Professional in Storm Water Quality (CPSWQ) Exam Review Study
Guide, May 2006.
3. Certified Professional in Erosion and Sediment Control (CPESC) Exam Review
Study Guide, February 2007.
4. New York Guidelines for Urban Erosion and Sediment Control, Urban Soil
Erosion and Sediment Control Committee, Fourth Printing - April 1997.
5. Stormwater Management Manual, WRC Engineering under the direction of Mesa
County Colorado, December 31, 2007.
6. Garfield County Colorado GIS Website, http://garfieldco.mygisonline.com/
7. Natural Resources Conservation Service National Cooperative Soils Survey
Website, http://websoilsurvey.nres.usda.gov/app/WebSoilSurvey.aspx
8. Drainage Criteria Manual, Urban Drainage and Flood Control District, Volumes 1,
2, & 3; Denver, Colorado 2001.
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Appendix A
Stormwater Management Inspection Form
(Blank and Completed)
SLAM CONSTRUCTION INC •
Stormwater Inspection Form
❑ Rainfall Event Visual Inspection ❑ No Discharge
Year:
Quarter (Circle One): 1 2 3 4
Date:
Visual Inspections Hurst be conducted quarterly least 20 days apart. One inspection per year must be conducted during a runoff event.
Statement of Certification:
1 cert01 that this report is trite, accurate, and complete to the best of my knowledge and belief
Name of person conducting the site inspection (Print):
Title:
Signature:
Name of Authorized Representative (Print):
Title:
Signature:
Required Documentation:
Inspection Date and Time:
Weather Information:
Locations Inspected:
Description of any
discharges occurring at
the time of the inspection:
Inspection Scope:
Observations:
Locations at industrial
operations discharges off-
site
Visual Inspection:
If present, observation of
floating materials, visible
sheen, odor, discoloration
Yes No If Yes, Describe Characteristic:
Observations:
Conditions of outfalls
2
Observations:
Presence of Non -
permitted discharges,
wastewater, or process
wastewater?
YES NO If YES Explain:
Descriptions of potential
pollutant sources accurate:
YES NO : If NO Explain:
Does the site map in the
SWMP reflect current
conditions
YES NO : If NO Explain:
Assessment of Control Measures:
Effectiveness of Control
Measures >
List Location of Control
Measures needing
Maintenance >
Reason for Maintenance >
Locations of additional or
different control measures
are needed >
Required Documentation: Corrective Action:
Is the site in compliance
with the terms and
conditions of this permit,
in relation to the
Inspection Scope
IN Compliance OUT of Compliance
If OUT of compliance, Explain:
d• Use Corrective Action Summary Sheet to provide a summary and schedule of
implementation of any actions that will be taken based on the visual
monitoring.
-3
Appendix B
CDPHE Certification and Permit
(Insert this once it has been received)
-4
T '
Facility
COLORADO
Department of Public
Health & Environment
CERTIFICATION TO DISCHARGE UNDER CDPS GENERAL PERMIT C0G500000
DISCHARGES ASSOCIATED WITH SAND Et GRAVEL MINING AND PROCESSING
(and other Nonmetallic Minerals except fuel)
Certification Number: COG501617
This Certification to Discharge specifically authorizes:
Elam Construction Inc
to discharge from the facility identified as
5 Mile Pit
to: Colorado River
Located at: 208 Stone Quarry Rd. (CR300), Parachute, Garfield County, CO 81635
Center Point Latitude 39.39843 Longitude -108.10757
Defined Discharge
Outfall(s) to Surface Water
Outfall(s) Lat
Long
Discharge Outfall(s) Description
Receiving
Stream
MGD
Outfall Number
001-A
39.39528,
108.11231
Mine dewatering discharge and potential
product washwater discharge from
sediment/detention pond
Colorado
River
1.6
Outfall Number
002-A
39.399046,
-108.105263
Stormwater runoff from haul/access road
Colorado
River
NA
AR discharges must comply with the lawful requirements of federal agencies municipalities, counties, drainage districts and other local
agencies regarding any discharges to storm drain systems, conveyances, or other water courses under their jurisdiction.
Permit Limitations and Monitoring Requirements apply to 001A as outlined in the Permit Part LB and Part I.C.
Parameter
Units
Discharge Limitations
Maximum Concentrations
Rationale
Monitoring
Frequency
Sample
Type
30-Day'
Average
7-Day-
Average.
Daily Max.
Flow,
50050
MGD
Report
NA
Report
Discharge
Evaluation
Instantaneous' or
Continuous
Recorder/
In-situ
pH, (Minimum -Maximum)
00400
s.u.
NA
NA
6.5-9.0
Water Quality
Standards
2 Days/Month
Grab
Total Suspended Solids,
00530
mg/t
30
45
NA
State Effluent
Regulations
2 Days/Month
Grab
Oil and Grease Visual
84066
NA
NA
NA
State Effluent
Regulations
2 Days/Month
Visualz
Oil and Grease,mg/l
03582
NA
NA
103
State Effluent
Regulations
Contingent2
Grab
Total Dissolved Solids'
70295
mg/l
NA
NA
Report
State Effluent
Regulation 93
Monthly
Grab
- If power is not available, flow may be measured on an instantaneou basis.
2 - If a visual sheen is noticed, a grab sample must be taken and analyzed for oil and grease.
3 - Required for discharges to the Colorado River Basin.
Certification issued: 10/4/2016 Effective: 10/4/2016
Certification expires upon the renewal of the COG500000 general permit or until the division
certification
This certification under the permit requires that specific actions be performed at designated times.
certification holder is legally obligated to comply with all terms and conditions of the permit.
Approved by:
Kathleen Rosow
Permits Unit 3 Work Group Leader
Water Quality Control Division
Page 1 of 1
4300 Cherry Creek Drive 5., Denver, CO 80246-1530 P 303-692-2000 www.colorado.gov/cdphe
John W. Hickenlooper, Governor I Larry Wolk, MD, MSPH, Executive Director and Chief Medical Officer
issues
The
ir
CO
a new
CDPHE
Ter
s
Appendix C
Maintenance Activities and Corrective Actions
5-
Appendix D
Training Documentation
6-
Appendix E
BMP Map
-7-