EROSION AND SEDIMENTATION CONTROL PLAN 3375 Mitchell Lane Remodel

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3375 Mitchell Lane Remodel
Erosion and Sedimentation Control Plan (ESC Plan)

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EROSION AND SEDIMENTATION CONTROL
PLAN





3375 Mitchell Lane

Remodel

3375 Mitchell Lane

Boulder
, CO 80
301


University Corporation

for Atmospheric Research

(Project Owner)









Prepared by
:


G
H
Phipps
Construction Company

5995 Greenwood Plaza Blvd.
Ste. 100

Greenwood Village, CO 80111
-
4710

(Controlling Operator)


SWMP Administrator:

Mike Liffick
, Project
Superintendent

(303)
901
-
2860

cell





Decemeber

1
3, 2010


3375 Mitchell Lane Remodel
Erosion and Sedimentation Control Plan (ESC Plan)

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EROSION AND SEDIMENTATION CONTROL

PLAN (
ESCP
)

Cover Sheet

(
THIS DOCUMENT TO REMAIN ON
SITE)


SECTIONS OF
ESC
P INCLUDED:


1.0

Site Description

1.1

Project Description

1.2

Site Location

1.3

Description of Construction Activities

1.4

Sequence of Events

1.5

Site / Disturbance Area

1.6

Site Soil Data

1.7

Existing Vegetation

1.8

Non
-
Stormwater Di
scharge

1.9

Receiving Waters

1.10

SWMP Administrator


2.0

Site Map


3.0

Stormwater Management Controls

3.1

Potential Pollutants

3.2

Best Management Practices (BMPs) for Stormwater Pollution Prevention

3.2.1

Erosion and Sediment Controls

3.2.2

Structural
Practices

3.2.3

Non
-
Structural Practices

3.2.4

Phased Implementation of BMPs

3.3

Other Controls




TABLE OF BMPS IMPLEMENTED PER THE PROJECT PHASING

3.4

Material Handling and Spill Prevention

3.4.1

Good Housekeeping

3.4.2

Hazardous Products

3.4.3

Product
Specific Practices

3.4.4

Spill Control Practices


4.0

Long
-
term Stormwater Management


5.0

Inspection and Maintenance

5.1

Minimum Inspection Schedule

5.2

Inspections

5.3

Record Keeping


6.0

Statement of Certification




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INTRODUCTION


This

stormwater

management plan (SWMP)

or erosion and sedimentation control plan (ESCP)

has been prepared for the

UCAR FLA Remodel

Project (the project)
. The goal of the SWMP is
t
o identify
potential

sources
of pollution
that may contribute pollutants to stormwater, and

identify Best Management Practices (BMPs) that, when implemented, will reduce or eliminate
negative

impacts to
water quality.

A
Low Impact
Grading Erosion and Sediment Control plan
(GESC) has been prepared for this project and has been approved by
Boulde
r

County
. The
GESC plan is referenced in many of the following sections and will be included as part of the
overall SWMP for this project.



1.0

SITE DESCRIPTION


1.1 Project

Description:
(I.B.1, I.C.1)


The proposed
UCAR FLA Remodel

project consists
of

a 53,000 square foot remodel and
retrofit of an existing building slated to receive a LEED rating
of Gold and possibly
Platinum. This project will be retrofitted in
o
rder to be a “fully” green building with
advanced energy efficiency
technologies, includ
ing a PV Solar array, a geothermal (ground
source) heating and cooling exchange system, comfortable offices, green natural lighting,
spacious break areas, indoor bike storage and the latest architectural finishes to provide a
great wor
k environment for the

end users. A few of the exterior improvements to this project
include: additional bike storage, designated hybrid/smart car parking spots, green friendly
landscaping, high efficiency sprinkler system and a designated smoking area area.


1.2
Site Locati
on:
(See also
the Vicinity Map
)


The project is located
in
the City of
Boulder
,
Boulder

County

at:

3375 Mitchell Lane
,

Boulder, Colorado 80301
,

near the intersection of
Mitchell Lane

and
47
th

Street
.

Throughout
this report, the site will also be referred to as “the project”.



1.3
Description of Construction Activities:
(I.C.1.a)


The proposed
p
roject consists of
the
demolition of existing
interiors and mechanical
electrical systems, demolition of the existing asphalt and retrofit of all demolished systems.
Utilities will also be installed within the project area which will require trenching to occur to
the north
, east

and south of the buil
ding.


Soil disturbing activities will include:
demolition, asphalt removal,
installing a stabilized
construction entrance,
installing
perimeter and other erosion and sediment controls;
finish
grading; installation of underground utilities;
installing a
new sprinkler system;
paving of
parking areas; and preparation for final seeding

and mulching
.


Upon completion, the project will consist of
a

finished building,
paved parking,
surrounding
sidewalk, and
native grass seeded

areas as well as some sprinkled s
od areas.



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1.4
Sequence of Events:
(I.C.1.b)


Construction for all work associated with the project will begin
on or about the end of
December, 2010

and
continue through

the end of
August
, 20
11
.

An updated schedule of
construction activities with approximate calendar dates will be kept in the
SWMP

Binder

under the section marked “Construction Milestone Schedule”
.


The following is a general list of the major construction activities to be perform
ed in order of
occurrence. For a more detailed

list
of activities
see the
Project Schedule
in the SWMP
Inspection and Log System Binder.



1.

Site Preparation:
Mark project disturbance limitations, mobilize office trailers,
and
installation of
initial
sedime
nt
control measures

2.

Schedule and att
end pre Construction Inspections

3.

Building

interior

and asphalt demolition

4.

Geothermal boring and installation


5.

Site Prep:
over lot

grading
.

6.

Utility Construction:

installation of utilities
,
backfill of trenches,
stabilization of
disturbed

areas
.

7.

Building
Interior: rough
-
in, interior finishes.

8.

Finish grading

9.

Site Concrete Construction: installation of the remaining curb, gutter and sidewalk

10.

Paving: completion of asphalt paving
.

11.

Site sprinkler installation.

12.

Final st
abilization:
seeding and mulching
, removal of all temporary BMPs

upon sufficient
vegetative cover establishment


1.5
Site / Disturbance Area:
(I.C.1.c)


The
fu
ll build out

of the
project contains approximately
3.24

acres
,

of which
2.0

acres will be
disturbed
.

The total area of the project

site
is approximately 3.24

acres.

Reference the site
map
(
C
3.01

and ASI
-
011r1
)

for
current limits of construction as well as
disturbed /
undisturbed
sections.


1.6
Site Soil Data:
(I.C.1.d)


Soils e
ncountered at the site are described as
3 to 6

feet of clayey fill underlain by
medium to
very
dense
,

silty, clayey sand with gravel and siltstone/claystone bedrock
. Given these soil
conditions, it is estimated that the propensity for erosion is moderate.

See the
Geotechnical
Engineering
report in the SWMP Binder

for additional details regarding soil conditions at the
site.

Accordingly, this plan will include the combined use of both structural and non
-
structural BMPs

to minimize potential erosive impac
ts and associated sediment migration
from the site during construction
.


Due to the existing structures
remaining in place
,
the post
-
project
runoff coefficients and
drainage
characteristics

will remain
relatively
unchanged.



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1.7
Existing Vegetation:
(I.C.1.e)


The existing site vegetation consists of prairie grasses and weeds, covering approximately
3/4

of the site surface.

The approximate vegetative density wit
hin this area is estimated at
60
%. The remainder of the site is covered with existing
structures and asphalt paving.


1.8
Non
-
Stormwater Discharge:
(I.C.1.g)


Other probable non
-
stormwater discharges for the project
will

include
concrete washout
,
water from
fugitive dust dewatering
, pavement wash water (where no spill or leak of toxic or
ha
zardous material have occurred),

and landscape irrigation return flow.

Each of the above
mentioned sources will be controlled with appropriate BMPs when
and if
it is necessary to
insure proper treatment
, none of which

will be allowed to discharge from the

site during
construction.


1.9
Receiving Waters:
(I.C.1.h)


The topography across the site is nearly level, with a
retention pond located on the east side
.
(Reference
ASI
-
011r1 and
C3.01

for topography and existing contours on the site)
.





1.10
SWMP Administrator:
(I.C.3.a)


Mike Liffick
, t
he Project
Superintendent
,

shall be the designated SWMP administrator

for the
project.

It will be his responsibility to manage and maintain the SWMP and to insure its
adequacy at all times to effectively manag
e potential stormwater pollutants throughout the
course of construction.


It is important for this document and the site map to remain consistent with current pollution
sources and Best Management Practices
(BMPs)
used by the project team. In the event
conditions at the site change, pollutant sources change, or BMPs change or need to be added
,
this plan and the GESC shall be updated accordingly by the SWMP Administrator or His
assigns.


Mike Liffick

can be reached at: 303
-
901
-
2860

(cell) or 303
-
571
-
5377

(office).


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2
.0

SITE MAP (SEE ATTACHED PLAN
S


GESC
SHEETS


See attached C3.01 Grading Erosion Control Plan, Detail 4/C4.21 and 5/C4.21.


3.0

STORMWATER MANAGEMENT CONTROLS


3.1
Potential Pollutants
*
:
(I.B.2, I.C.1.f, I.C.3.b)


Potential pollution sources

for this site include

the following
: sediment
-
laden stormw
ater
runoff from disturbed areas
, sediment tracked by construction equipment

onto paved
surfaces
,
contaminated soils

due to spills

or accidental leaks
,
fuel spills from
loading and
unloading
of
construction materials and equipment

(fueling of equipment and storage of fuel
will not be allowed on site)
,

airborne dust from grading or
demolition activities, construction
site waste (dumpsters),
lubricants and adhesives for utility installation, adhesi
ves,
paints,
plaster, and other interior finish materials,
cleaning solvents,
liquid wastes from concrete and
or
tool
washing activities
, asphalt
material from
paving

operation
,
effluent from
portable
toilet units, and
nitrates / nitrites from
soil amendme
nts

(see site map for locations
of
potential pollutant sources and associated
BMPs).

There
is

no anticipated on
-
site asphalt or
concrete batch plants associated with this project.


Portable toilets shall be located on the jobsite where they can be accesse
d for regular service
and they will be anchored to prevent the possibility of accidental tipping
.
Vehicle track
ing
control

will include stabilized access points, minimizing traffic to the maximum extent
possible during wet conditions and sweeping or scr
ap
ing paved sections (public or private)
when necessary.

These vehicle tracking controls will be maintained in good, effective
condition during any periods of construction activity.


*Reference section
3.2.4

for an itemized list of pollutant sources
and selected BMPs
anticipated for this
project
.


3.2
Best Management Practices (BMPs) for Stormwater Pollution Prevention:
(I.C.3.c)


3.2.1
Erosion and Sediment Controls:


Appropriate

BMPs shall be installed before earthwork begins (where possible).

Locati
ons for specific BMPs are shown on the site map.

The temporary measures to
be used in the control of sediment and stormwater from the site during construction are:


a.

Follow a
ll local, state and federal regulations pertaining to stormwater

control
.

b.

Silt fen
ce
may

be installed
, where appropriate,
around areas of construction to
intercept and detain small amounts of sediment in order to reduce the amount of
sediment in runoff leaving the site.

c.

Inlet protection
may

be used
as necessary along
Mitchell Lane

as a
secondary BMP to
treat
runoff
.

d.

Vehicle tracking
control pads

shall be place
d

at the access / exit points and shall be
maintained throughout construction.


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e.

All construction debris / trash shall be picked up and disposed of in proper containers
and hauled off

of the site as necessary.

f.

Concrete washout

facilities

shall be placed on site as dictated by the contractor

prior
to
pouring
concrete
. Each concrete washout area will be constructed per the included
detail and

located to minimize the combining of wash wa
ter contaminates with
stormwater
.
Excess concrete material will be removed from the washout area when
the BMP has reached ½ of its capacity and will be disposed at a facility

licensed to
h
andle the material.

Special care will be taken to place washout fa
cilities
in areas
where ground water is not likely to
interface with liquid wastes
.
Locations will be
indicated on the site map prior to installation.

g.

Construction materials
that could have a negative impact on water quality will be
stored, when not in ac
tive use, in a manner that will minimize contact with
stormwater.

Containment structures for fuel / chemical storage will be installed per
the included detail. A site Spill Kit will be on site at all times. If any spillage occurs,
the contaminated soil s
hall be immediately excavated and removed from the site to a
disposal area licensed to handle the contaminated material.

h.

Any changes to the proposed erosion control measures shall be noted on the SWMP
Site Map
, in most cases prior to the changes being impl
emented in the field per the
2007 CGP
.

When changes are required in the field first, the site map will be amended
immediately but in no case longer than 72 hours.

i.

Whenever sediment is transported onto an adjacent street, the street shall be cleaned
at the
end of the day. Sediment shall be removed from the street by shoveling
,

sweeping

or both
.


3.2.2
Structural Practices:
(1.C.3.c.1)


See
SWMP Reference Guide

and attached GESC sheets
for installation specifications
and
maintenance
details for all
structural controls described below.


Silt Fence:
Silt fence
shall

be installed
,

when appropriate,
along the down
-
stream side of
exposed/disturbed soil areas and around the base of all stockpiles

prior to grading or
stockpiling on the project. Locations
are shown on the site map.


Straw Wattles:
Straw wa
tt
les
may

be installed
in areas where minimal containment is
needed
as located on the site map
.


Rock Wattles:
Rock wa
tt
les
may

be installed in the flow line of the existing curb and
g
utter adjacent to t
he project

as necessary
.

Locations are shown on the site map.


Inlet Protection:
If possible, inlet protection devices may be used at inlets located along
streets adjoining the project. Inlet protection is designed to

reduce

construction
-
related
sedime
nt from being conveyed

into the storm sewer system. If used, t
he inlet protection
shall be maintained until the up gradient ground surfaces have been stabilized.


Outlet

Protection: On
-
site storm water outlets,
if
constructed
,

shall be protected with
rip
rap surrounding the outlet opening. The riprap will prevent scour at stormwater outlets
and minimize the potential for downstream erosion by reducing the velocity of

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concentrated
s
tormwater flows. The outlet protection shall be maintained
and in place at

all outlet locations as a permanent BMP
.



Vehicle Tracking Control:
Vehicle tracking
pads

for this site shall be place
d

at the access
/ exit points and shall be maintained throughout construction.
An approximate thickness
of 12 inches of 3 to 6 inches riprap is recommended, but this design shall be subject to
revision based on site conditions
and local ordinances
to achieve the desired result.
Construction fencing will be installed as necessary to
limit

egress

to stabilized
access
points

only.
Locations are shown on the site map.

If mud or soils are tracked onto

paved
sections
or
public roads, the roads shall be swept clean
as soon as possible
. No
construction debris or soil deposits shall be all
owed to impede the smooth flow of traffic
on public roads.


The project team may discover the need for additional BMPs to be installed during
construction. If necessary, BMPs such as diversion ditches, temporary type III sediment
traps or other structural

controls may be implemented to reduce sediment in runoff
.
All
structural measures will be indicated on the site map.


3.
2
.3
Non
-
Structural Practices
:
(1.C.3.c.2)


Where applicable, s
ee SWMP Reference Guide and attached GESC sheets for
installation spe
cifications and

maintenance

details for
related non
-
structural controls
described below.


Proper planning and budgeting for stormwater controls will be performed before
construction begins.


Additional stock of certain materials such as straw wattle, silt fence, gravel and other
commonly used BMPs
may

be kept on site to be able to quickly address unexpected
pollution prevention needs as they arise during the course of the work.


Existing veget
ation will be protected and maintained wherever possible.


Vegetative ground cover will be established on all disturbed areas according to the
local
ordinances and
landscape plans in order to minimize erosion and stormwater runoff.


All
exposed soil
area
s

having a slope of 3:1 or greater shall be stabilized with erosion
control blankets

or another BMP to minimize erosion of the slope.
Final s
tabilization
BMPs will be implemented
within 7 days
after grading
activities have ceased,
unless
work is to be resume
d within 30 calendar days.

Where final grading has not occurred but
disturbed areas remain dormant, temporary stabilization methods
such as surface
roughening
will be implemented.
All non
-
structural control measures implemented
during construction will b
e indicated on the site map.




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3.
2.
4.
Phased Implementation of BMPs
:
(1.C.3.c.3)



The following chart indicates the major activities that will occur before, during and after
construction
. Included within the chart are the potential pollutants and associated BMPs planned
for implementation during each of the construction activities listed.
Following this chart is a
legend for the BMP designations shown.

This chart will be updated
prior
to and
throughout each
major phase of construction in order to insure the appropriate implementation of BMPs
indicated.



Construction
Activity
/Sequence

Date

Potential
Pollutants

Best Management Practices (BMPs)

Erosion

Sediment

Operational

Before
Construction:






Pre
-
construction
planning & scope


N/A



Training,
Planning mtgs

Complete final
SW
MP



N/A










Project Bidding



N/A



Clear scope,
Contracts,

training







Layout and Survey



N/A




Mobilization


Fuel Spills

Sediment

Raw
sewage

(ongoing)

Trash


SF

GP, PT

(ongoing)
,
SC, HMS, TC,
SSA

Initial perimeter
controls


Sediment

EV

SF, VTC

TC

Construction
Activity

Date

Potential
Pollutants

Best Management Practices (BMPs)

Erosion

Sediment

Operational

During
Construction:






Demolition


Dust

Unused
building
materials

Sediment


SF

Dewatering,
SC


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Rough Grading


Sediment
Dust

EV, SR, TS

EB, MU


SF, VTC, IP,
SB, DD

Dewatering,
SC
,

GP,
HMS, TC, SP,
SSA

Underground
Utilities,


Sediment
Liquid Waste

EV, S
R



SF, VTC

SC, GP,
HMS, TC,
CW, SP, SSA

Asphalt Paving


Fuel

Oils

EV




SC, GP,
HMS, TC,
SSA

Building
Foundations
,
sidewalks


Sediment

Concrete

Stockpiles

Dust

EV



SF, VTC

Dewatering,
SC, GP,
HMS, TC,
CW, TWS,
SP, SSA

Building Structure &
Interior Finishes


Sediment

Liquid waste

Concrete

EV



SF, VTC

SC, GP,
HMS, TC,
CW, TWS,
SP, SSA

Final Stabilization


Sediment


EV, PS,

MU,


SF


SC
































Construction
Activity

Date

Potential
Pollutants

Best Management Practices (BMPs)

Erosion

Sediment

Operational

After
Construction:






Remove BMPs
(upon Final
Stabilization only)


Trash

Debris



TC


















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BMP Legend and Maintenance Schedule:


BMP
Designation

Description

Maintenance Requirements



Refer to th
e
Installation specification
section of the
SWMP

binder and
related GESC plan sheets

for
installation
and maintenance details

SF

Silt Fence

SR

Surface Roughening


DD

Diver
sion Ditch
/Di
ke


GB

Geo
-
synthetic Check Barrier


DCEB

Drainage Channel Erosion
Blanket


MU

Mulching


E
C
B

Erosion

Control

Blanket


RC

Rip Rap Channel


CD

Check
Dam


RRB

Rip Rap Berm


FB

Pipe end Filter Bag for
Dewatering Operations


T
SD

Temporary
Slope Drain


SB

S
tandard
Temp Sed.
Basins


CP

Culvert Inlet Protection


SW

Straw Wattle


VTC

Vehicle Tracking Control


CW

Concrete Washout

Area


IP

Inlet Protection


OP

Outlet Protection


RCS

Rough Cut Street Control


EV

Existing Vegetation

Existing vegetation to remain undisturbed
may

be protected by wire rope barriers and stakes
or orange construction fencing

if necessary

TS

Temporary Seeding

Use approved standard seed mix

PS

Permanent Seeding

Use approved standard seed mix

SC

Secondary Containment



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PT

Portable Toilet


GP

Gravel

Stabilized Parking


HMS

Hazardous Material Storage
*


TC

Trash Container


TWS

Tool Washing Station


SSA

Stabilized Staging Area


SP

Stock pile area







*
Reference Hazardous Materials Technical Data sheets for details and proper handling
procedures for chemicals used or stored on site.

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3.
3

Other Controls:
(1.C.3.c.1
-
8)


Solid construction waste and debris that are not properly disposed of can be a source of water
and wind born pollution.
All waste materials will be collected and stored in a metal dumpster
rented from the Benson Roll
-
off Service, which is a licensed solid
waste management
company in Denver. The dumpster will meet all local
Arapahoe
County and any State solid
waste management regulations. Trash and construction debris from the site will be deposited
in the dumpster. The dumpster will be emptied as needed,

and the trash will be hauled to a
licensed landfill. No construction waste materials will be buried onsite; recycled concrete
may be used as fill with permission of the Civil Engineer. All personnel will be instructed
regarding the correct procedure for

waste disposal. Notices stating these practices will be
posted in the office trailer and the individual who manages the day
-
to
-
day site operations,
will be responsible for seeing that these procedures are followed


Sanitary waste associated with portable

toilets on construction sites is considered a hazardous
material and must be contained. Portable toilets are considered an adequate containment

and
do not require secondary
containment

but must be placed on flat ground and away from inlets
and drainage w
ays.
It is also recommended that p
ortable toilets
remain on pervious surfaces
and
be secured
at their base to protect
against accidental tipping.


Accidental spills most often occur when loading and unloading construction materials. To
prevent and more eas
ily contain potential discharges during loading and unloading
operations
, a

designated area for the majority of this ty
pe of activity will be provided
(see
SSA on
site map). A spill response kit will be provided in the loading and unloading area.


C
onstru
ction equipment such as forklifts and other miscellaneous equipment
will be
operating on this site for the duration of the project. Fueling and maint
enance of this
equipment will not be allowed

on the site. Incidental fuels
such as gasoline and diesel, f
or
small machines (saws, compactors, etc.)
and maintenance materials will be required
. All
will
be stored

off site
.
Potential pollutants
, such as paint, will be

kept within d
esignated storage
areas will have

secondary
contain
ment

in place
to minimize the

potential for
direct contact
with

stormwater runoff.

A spill response kit will be provided for storage area
s

in case of
accidental spills
. Spill

prevention and response procedures will be followed

as outlined in
section 3.4

of the SWMP
.


T
his
project
’s structure
has landscaping features, curb/gutter and a trash enclosure element
comprised of concrete.
Concrete contains c
ement
which has a very high PH and
can be

detrimental to
water quality
. The process of pouring concrete typically requires that conc
rete
truck

placement chutes

be washed before leaving the job. Concrete truck
chute
washout will
be performed in designated, properly contained and clearly marked locations. Washout
locations will be located away from stormwater conveyances and will be no
ted on the site
map.


Worker trash from meals eaten on the jobsite can be a source for pollution if not properly
disposed of. Trash containers

will be adequately supplied in quantities and locations to
properly address this concern. Trash containers wil
l be emptied regularly and trash will be

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properly disposed of where it will not pose a threat to water quality.
Containers will be of
sufficient weight or otherwise secured to prevent tipping by wind.


During construction operations it is often necessary f
or many different trades to clean tools
on the site. Efforts will be made in project preplanning to minimize the incorporation of any
materials into the building process that are hazard
ous

to water quality. Tool washout areas
shall also be provided for th
e containment of paint, solvent and cement products that are
washed from tools during construction even if they are not considered “hazardous”. Under no
circumstances shall tools be cleaned in locations where
associated
pollutants can enter the
storm drain

system.


3.
4

Materia
l Handling and Spill Prevention:
(1.C.3.c.4)


The following are material management practices that will be used to reduce the risk of spills
or other accidental exposure of materials and substances to stormwater runoff.


3.
4
.1
Good Ho
usekeeping
:

The following good housekeeping practices will be followed
onsite during the construction project:


1.

An effort will be made to store only enough material required to do the job.

2.

All materials stored on site will be stored in a neat, orderly man
ner in their
appropriate containers and off of the ground
,

protected from weather or within
secondary containment.

3.

Products will be kept in their original containers with the original manufacturer’
s

label.

4.

Substances will not be mixed with one another
unless recommended by the
manufacturer.

5.

Whenever possible, all of a product will be used up before disposing of the
container.

6.

Manufacturers’ recommendations for proper use will be followed.

7.

Any remaining chemicals shall be disposed of according to manufac
turers’
recommendations and in accordance with Federal, State and local regulations.

8.

The
SWMP Administrator

will inspect
regularly

to ensure proper use and disposal
of materials onsite.


3.
4
.2
Hazardous Products:

These practices are used to reduce the ris
ks associated with
hazardous materials.


1.

Products will be kept in original containers unless they are not re
-
sealable.

2.

Original labels and material safety data will be retained.

3.

Products will be stored under cover

4.

If surplus product must be disposed of,
manufacturers’ or local and State
recommended methods for proper disposal will be followed.


3.
4
.3
Product Specific Practices:



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Petroleum Products:
All onsite vehicles will be monitored for leaks and receive
regular preventative maintenance to reduce the

chance of leakage. Petroleum
products

for vehicle and equipment operation and maintenance

will be stored
off site
.
Any asphalt substances used onsite will be applied according to the manufacturer’s
recommendations.


Leaks occur generally as a result of
faulty, old or improperly maintained equipment

or storage facilities
. If unintentional leaks are detected, the operator will
identify and
abate the material immediately. For impervious surfaces, an absorbent material will
be used to soak up the liquid wa
stes and then swept up and placed in a contained unit
for proper disposal. When leaks are detected on soils, the operator will remove
contaminated soils from the earth and place them in a contained unit for proper
disposal.


Containers

used for

contamin
ated materials will be c
learly marked and kept from
coming into direct contact with stormwater
. Storage or fueling areas where leaks can
occur shall be inspected visually on a regular basis. Efforts taken to abate
unintentional leaks and repair faulty eq
uipment will be recorded in the activity log.
Unintentional leaks must not be confused with spills and should be documented
accordingly
.


Fertilizers:

Fertilizers will be applied only in the minimum amounts recommended
by the manufacturer. Once applied, fertilizer will be worked into the soil to limit
exposure to stormwater. Storage will be in a covered
and contained area
. The
contents of any partia
lly used bags of fertilizer will be transferred to a sealable plastic
bin to avoid spills.

Soil amendments will be spread and tilled into the soil
immediately upon arrival to the site in order to minimize direct contact with
stormwater runoff. Where soil

amendment stock piles are necessary, they will be
contained using
BMPs such as
earthen berms.


Paints:

All containers will be tightly sealed and stored

off the ground and protected
from weather, or in secondary containment
,

when not required for use. Ex
cess paint
will not be discharged into the storm sewer system, but will be properly disposed of
according to manufacturer’s instructions and State and local regulations.


Concrete:

Concrete trucks will be allowed to wash
their chutes
in designated areas
o
n the site.
Surplus concrete and drum wash water will
be disposed of at an approved
off
-
site landfill and will
not be allowed to be discharged at the site.

No washout
material will be allowed to run off site, and wash out areas will be properly cleaned a
s
necessary.


3.
4
.4
Spill Control Practices:

In addition to the good housekeeping and material
management practices disc
ussed previously in this plan, the following practices will be
followed for spill prevention and cleanup:



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Manufacturers’ recommended methods for spill cleanup will be clearly posted
in the
job trailer
and site personnel will be made aware of the procedures and the location of
the information and cleanup supplies.


M
aterials and equipment necessary for spill cl
eanup will be kept in the material
storage area onsite. Equipment and materials will include but
are
not be limited to:
brooms, dust pans, mops, rags, gloves, goggles,
absorbent powder / kitty litter
, sand,
sawdust, and plastic and metal trash containers
specifically for this purpose.


The operator will inform the jobsite personnel that
if

a spill of any size occurs they
are to always notify the SWMP manager and, depending on the nature and severity of
the spill, the operator will contact the CDPHE, downst
ream users and other regulatory
agencies.


The WQCD requires that any hazardous material spill be reported when any of
the following conditions occur:




Over 25 gallons of petroleum



5 CCs of mercury



Any and all raw sewage releases



Any/all State waters
impacted


If any of the above criteria is met or exceeded, the Colorado Department of Public
Health and Environment, Local Emergency Planning committee, downstream users
and other agencies (MS4s) will be notified. The CDPHE will be notified by telephone
wi
thin 24 hours. In addition, written notification describing the spill and the clean up
procedures used will be sent to the agencies 5 days following the spill. If a spill does
not meet the above criteria, reporting is not mandatory.


When any spill occurs:


1)

Notify the controlling operator of the site immediately following a
hazardous spill.

2)

Document the spill and its clean
-
up procedures whether reporting is
required or not.

3)

At a minimum document the following:




Nature of spill



Quantity of spill



Date/time
spill occurred



Agency notification if necessary



Clean
-
up procedures used



Daily monitoring (7 days) after clean
-
up



Photographs



Interview(s) with any witnesses of the event



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General guidelines for clean
-
up procedures:




Immediately control or stop the release
/spill



Mitigate the spill area as needed with a spill prevention kit



Obtain approved secondary containers to store any absorbents used



Report the spill to the Responsible Person on the jobsite for determination if
further reporting is required or if emerg
ency notification is appropriate.


CDPHE Toll Free 24
-
hour Env. Emergency Spill Reporting Line:


1
-
877
-
518
-
5608


John Douglas
,
SWMP Manager /
Project
Superintendent
:





303
-
901
-
8498



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4.0

LONG
-
TERM STORMWATER MANAGEMENT


Final Stabilization:
(I.C.4)


Final stabilization will be achieved through building construction, new pavement for
parking
areas

and
planting native grasses
.
All disturbed areas other than those constructed upon shall
receive seed, sod or some other form of vegetation or ground cover.

To
consider this project
site stabilized
, a uniform vegetative cover with a density of at least 70 percent of pre
-
disturbance levels will first be reached. All disturbed areas (except those portions covered by
pavement or a structure) will be
planted wit
h permanent seed mix

within 7 days of
the
completion of construction activity. Disturbed areas where work is temporarily halted shall
be temporarily stabilized within 7 days of cessation of activity unless

work is to be resumed
with 30 calendar days.

NOT
E: Once earthwork has begun on a section, it shall be pursued
until completion.


There
is

no p
ermanent water quality BMPs

planned for this site.
Drainage characteristics and
ground cover types used to stabilize the site will match
those present prior to c
onstruction.



At the completion of the project, when all areas have received final/permanent stabilization
measures, all temporary BMPs shall be removed and properly disposed of.

If suitable
vegetative cover is not adequately established, the permit m
ay be transferred to the Owner of
the site following completion of construction.




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5.0

INSPECTION AND MAINTENANCE
(I.C.5, I.D.6)


5.1
Minimum Inspection Schedule
: (1.D.6.a)


All erosion/sediment control features will be inspected for effectiveness
at a minimum of
every
7

days

and after each precipitation event or rain or snowmelt event that results in
surface erosion

or per the requirements listed within the GESC
.


5.2
Inspections

and Maintenance*
: (1.D.6)


The inspection process will determine if there is evidence of, or the potential for, pollutants
entering the drainage system, and BMPs will be reviewed to determine
whether they
meet the
design and operational criteria in the SWMP and that they continue to

adequately control
pollutants at the site.


The inspection process will include
identifying
BMPs that are found to no longer function as
needed and designed, as well as preventative maintenance to proactively ensure continued
operation. BMPs that have fa
iled, or have the potential to fail without maintenance or
modifications will be addressed as soon as possible to prevent the discharge of pollutants.



The inspection process will assure the replacement or the addition of BMPs as needed. Areas
outside o
f the limits of construction but within the development should also be visually
inspected in order to notify those responsible for BMPs found in disrepair.


The inspection process will include the updating of the SWMP to
identify all pollution
sources and
associated
BMPs that are being implemented in the field. All activities related to
implementing the SWMP or repairing and replacing BMPs will be documented. Corrective
actions will be implemented according to CDPS requirements.


All corrective actions an
d stormwater management activities will be documented. Inspection
forms will contain the required certification statement and will be signed by the appropriate
SWMP
administrator

qualified to perform the inspection

when applicable
.


Silt fence will be i
nspected for depth of sediment, tears, to see if the fabric is securely
attached to the fence posts, and to see that the fence posts are firmly in the ground. Built up
sediment will be removed from the silt fence when it has reached 6 inches in depth.


In
let protection devices/methods shall be inspected for effectiveness and
sediment build
-
up.

If sediment levels reach 30%, it will be removed.


Outlet protection will be inspected for quantity and condition of rip rap and sediment build
-
up. If sediment lev
els reach 30%, it will be removed.


Wattles will be inspected for condition, undermining and sediment build
-
up. If sediment
levels reach 50%, it will be removed.



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The vehicle tracking control pad
(s)

shall be inspected to ensure the aggregate material
remains
generally free of sedimentation deposits and meets
the required specifications unless
otherwise noted / redlined.


Street
s shall be inspected and

cleaning shall be performed as needed during al
l construction
activities.



Seed and mulch used to minimize erosive impacts

will be inspected
to insure adequate
coverage and

healthy growth.

Additional seed and mulch will be applied to bare or eroded
areas where it is determined necessary.


5
.3
Record

Keeping:


A maintenance inspection report will be made after each inspection. A copy of the report
form to be completed by the inspector will be filed onsite.


A rain gauge will be located on the site and readings will be logged whenever precipitation
oc
curs.


A log documenting stormwater management activities

that occur
s

outside of regular
inspection dates
may be kept by the SWMP Manager on this site
.
The SWMP Administrator,
or his assigns,

may

enter documentation in the log, as they determine appropria
te for site
conditions.




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6.0
STATEMENT OF CERTIFICATION


I
certify under penalty of law that this document and all attachments were prepared under my
direction of supervision in accordance with a system designed to assure that qualified personnel
properl
y gathered and evaluated the information submitted. Based on my inquiry of the person
or persons who manage the system, or those persons directly responsible for gathering the
information, the information submitted is, to the best of my knowledge and beli
ef, true, accurate,
and complete. I am aware that there are significant penalties for submitting false information,
including the possibility of fine and imprisonment for knowing violations
.


Signed_________________________________________ Date
_________________



Print name and title_____________________________________________________