HomeMy WebLinkAboutAVAGO TECHNOLOGIES BLDG. 4 WEST EXPANSION - MJA/FDP - FDP130006 - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORT (5)AVAGO TECHNOLOGIES – BUILDING 4 WEST
ANNEX EXPANSION AND SITE
DEVELOPMENT
EROSION CONTROL REPORT /
STORMWATER MANAGEMENT REPORT
CITY OF FORT COLLINS, COLORADO
MARCH 25TH, 2013
MARTIN/MARTIN PROJECT NO. 13.0091
PREPARED FOR: AVAGO TECHNOLOGIES (APPLICANT)
7380 ZIEGLER ROAD
FORT COLLINS, CO 8025-9790
(970) 288-0344
PAUL TANGUAY
PREPARED BY: MARTIN/MARTIN, INC.
12499 WEST COLFAX AVENUE
LAKEWOOD, COLORADO 80215
PHONE: (303) 431-6100
PRINCIPAL IN CHARGE: MATTHEW B. SCHLAGETER, P.E.
PROJECT MANAGER: PETER S. BUCKLEY, P.E.
PROJECT ENGINEER: BRET M. SMITH, E.I.T. II
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A. GENERAL REQUIREMENTS................................................................ 3
PROJECT LOCATION:................................................................................................ 4
NATURE AND PURPOSE OF CONSTRUCTION ACTIVITY: ................................ 5
EXISTING CONDITIONS: .......................................................................................... 5
DISTURBED AREA ESTIMATES: ............................................................................. 5
EXISTING PERCENT VEGETATION GROUND COVER: ..................................... 5
EXISTING SOIL TYPE / EROSION POTENTIAL:................................................... 5
RECEIVING WATERS:................................................................................................ 6
ANTICIPATED ALLOWABLE SOURCES OF NON-STORMWATER
DISCHARGE:................................................................................................................ 8
PROPOSED SEQUENCE FOR MAJOR ACTIVITIES:............................................ 8
B. STORMWATER MANAGEMENT CONTORLS: .................................. 9
SWMP ADMINISTRATOR: ......................................................................................... 9
IDENTIFICATION OF POTENTIAL POLLUTANT SOURCES:.......................... 10
DESCRIPTION OF STRUCTURAL AND NON-STRUCTURAL BMP’S .............. 14
C. SEQUENCED BMP IMPLEMENTATION.......................................... 19
GENERAL.................................................................................................................... 19
INITIAL ....................................................................................................................... 19
INTERIM..................................................................................................................... 20
FINAL .......................................................................................................................... 21
D. INSPECTION AND MAINTENANCE PROCEDURES ..................... 21
E. FINAL STABILIZATION...................................................................... 23
SOIL AMMENDMENTS ............................................................................................ 23
PERMANENT SEED MIX ......................................................................................... 23
F. REFERENCES ....................................................................................... 24
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A. GENERAL REQUIREMENTS
This report represents a Stormwater Management Plan (SWMP) for the proposed Avago
Technologies - Building 4 West Annex Expansion and Site Development (hereafter
referred to as “PROJECT”). This plan was prepared based upon the regulatory
requirements and guidelines set forth by the Colorado Department of Public Health and
Environment Water Quality Control Division – Stormwater Program’s “Stormwater
Management Plan Preparation Guidance” April 2011 revision; the “Urban Storm
Drainage Criteria Manual – Volume 3”, current revision, the City of Fort Collins
Standards and Specifications, and the document provided by the City of Fort Collins
entitled “RE: Erosion Control Report and Drawing Requirements Accompanying
Document”.
This report identifies potential sources of pollution which may reasonably be expected to
affect the quality of stormwater discharges associated with construction. Furthermore,
this report describes the practices to be used to reduce, or possibly eliminate, these
potential pollutants from impacting the quality of water. The SWMP shall be completed
and implemented by the time construction activities begin until final stabilization. The
SWMP shall be revised as necessary during construction activities so that it accurately
reflects the conditions and current practices found on site as construction progresses. A
copy of the current updated SWMP shall be kept on site at all times and available for
review by all jurisdictions having authority over stormwater discharge from the project
site.
This report puts forth recommendations for Best Management Practices (BMPs) and
provides a description and/or detailed drawings of how these practices are to be installed,
implemented and maintained. The contractor is responsible for complying with ALL
requirements of the Colorado Department of Health and Safety’s Storm Water Discharge
Permit including any changes to this SWMP to meet the requirements of the Permit.
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PROJECT LOCATION:
The PROJECT site is located on the Hewlett-Packard Campus (hereafter referred to as
“CAMPUS”) in Lot 2 of the Preston-Kelley 2
nd
Subdivision, found in the Southwest ¼ of
Section 33, Township 7 North, Range 68 West of the 6
th
Principal Meridian, City of Fort
Collins, County of Larimer, State of Colorado. The PROJECT address is 4380 Ziegler
Road. The overall site consists of 8.80 acres of disturbed area.
The overall CAMPUS is bound to the north by Hidden Pond Drive, to the east by the
Fossil Creek Drainage Ditch, to the south by East Harmony Road, and to the West by
Ziegler Road. The PROJECT site is bound to the north by an existing field and
Technology Parkway (“Ring Road”), to the east by the existing Hewlett Packard Building
4, to the south by existing landscaped areas and an asphalt parking lot, and to the West by
Technology Parkway. Refer to the vicinity map below and in the Appendix.
Figure 1: Vicinity Map, NTS
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NATURE AND PURPOSE OF CONSTRUCTION ACTIVITY:
The proposed development will include the construction of an expansion to the existing
Building 4, private asphalt and concrete drives, and utility infrastructure necessary to
service the proposed building. The footprint of the building expansion covers
approximately 80,000 SF. Additionally, drainage facilities designed to improve
Stormwater Quality are proposed for the site in accordance with Section 3.4.3 Water
Quality of the City of Fort Collins Municipal Code.
EXISTING CONDITIONS:
The existing site topography generally slopes from west to east at approximately 0.7
percent. Native grasses or existing asphalt drives and parking cover a large majority of
the site. A large portion of the existing parking lot located west of the Building 4
Expansion footprint is proposed for demolition in order to maintain compliance with the
“Hewlett-Packard Building 4 Drainage Report”, by Sear-Brown Group, 1999.
DISTURBED AREA ESTIMATES:
Total Site Area: 8.80 Acres
Total Area Disturbed: 8.80 Acres
EXISTING PERCENT VEGETATION GROUND COVER:
The existing vegetative cover consists of landscaped areas with short grasses, trees, and
shrubs in the existing islands, medians, and landscaped areas in front of existing
buildings. These existing landscaped areas are estimated to have 98-100% vegetation
ground cover. Additionally, large native areas are located west of the proposed Building
4 Expansion footprint. These native areas are estimated to have 50% vegetation ground
cover.
EXISTING SOIL TYPE / EROSION POTENTIAL:
According to the “Geotechnical Engineering Report” produced by Terracon Consultants,
Inc., dated September 4, 2012, the existing soils consist of fill materials consisting of
sandy lean clay with various amounts of sand and gravel, and in-situ poorly graded sand
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with gravel. Based on the results of borings, claystone bedrock is located at a maximum
depth of exploration of 39.7 feet. Groundwater was observed at a maximum elevation of
4982.6’, and a minimum depth of 18’ below existing grade. The soils on site are typically
SCS Type C Hydrologic Soils. A USDA web soil survey of the CAMPUS states that the
soils consist mostly of Nunn clay loam. A copy of the web soil survey is referenced in the
Appendix. Soil data was not specifically used in the development of this SWMP report.
Specific analysis was not performed to determine the existing erosion potential for soil
erosion.
RECEIVING WATERS:
According to the City of Fort Collins website, the CAMPUS belongs to the Fox
Meadows Drainage Basin, which encompasses approximately 2.4 square miles in
southeast Fort Collins. The Basin is bound by Horsetooth Road on the north, Lemay
Avenue on the west, Harmony Road on the south, and the Cache La Poudre River on the
east. The basin is primarily developed with residential development, some commercial
areas and the Collindale Golf Course. The basin does not include a major drainageway
for conveying flows through the basin. Storm runoff flows through a network of storm
sewers, local drainage channels and detention ponds from west to east; ultimately
discharging into the Cache La Poudre River.
The PROJECT site is specifically divided into two historic basins - North and South. The
majority of the proposed PROJECT site discharges north to a regional channel. The
channel was designed for the 100-year storm and discharges to the North Pond on the
CAMPUS. Stormwater detention and water quality treatment for the CAMPUS is
provided by four on-site ponds located in the SE corner of the CAMPUS. These ponds
are constructed as Extended Detention Basins (EDBs). The North Pond is a dry bottom
pond. The South Pond, Southwest Pond, and Dam Pond are wet ponds. From the regional
channel, runoff enters the CAMPUS North Pond, which then flows into the South Pond,
which then flows into the Dam Pond before flowing off-site and eventually into the
Cache La Poudre River. Added water quality benefits are gained via the regional channel
along the north side of the campus which is constructed as a Grass Swale. This channel
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provides initial water quality treatment to the north-flowing basins in the PROJECT area
prior to treatment in the CAMPUS ponds.
Runoff from the southern portion of the PROJECT site is conveyed via on-site storm
sewer into the CAMPUS Southeast Pond, which then flows into the South Pond, which
then flows into the Dam Pond before flowing off-site and eventually into the Cache La
Poudre River.
Figure 2: Major Drainage Basin
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ANTICIPATED ALLOWABLE SOURCES OF NON-STORMWATER
DISCHARGE:
In addition to discharge from storm water, landscape irrigation return flows may be
anticipated from tributary landscaped areas. There are no wetlands or springs anticipated
to contribute to site discharge.
PROPOSED SEQUENCE FOR MAJOR ACTIVITIES:
Phase 1: The first phase of construction activity on the B4 West Annex project will
include selective demolition, clear and grub, over-lot grading, and some underground
utility construction. This is tentatively scheduled to begin on June 24
th
2013. Prior to any
of the aforementioned activities beginning all BMPs will be installed per the erosion
control drawings and details. Once installed and inspected by J.E. Dunn Construction
Phase 1 activity will begin. The major BMPs in place during phase one will include S-
Fence, VTC, Concrete Washout, existing Inlet Protection as required, and Stockpile
management and protection.
Target Start: 6/24/2013
Target Completion: 7/24/13
Phase 2: The second phase of construction activities will include major foundation
activities, under-slab MEP activities and the balance of underground utility activities.
This phase will begin immediately following the completion of over-lot grading. All
BMPs will be maintained during this phase of construction with the VTC and CWA
BMPs seeing increased activity as a result of concrete operation. Stockpile activity during
this phase will be minimal. Any additional BMPs required of our interim erosion control
plan will be installed at this time and will be maintained until stabilization activities
begin.
Target Start: 7/24/13
Target Completion: 1/5/2014
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Phase 3: Phase three of the B4 West Annex Project will include all enclosure activities.
This will include steel and pre-cast deliveries and erection. This will also include any
exterior curtain wall or metal panel installation as required. Roofing activities will also be
completed during this time in order to provide a dry building. No changes to interim
BMPs should be expected but all BMPs will be maintained as required during phase 3
construction.
Target Start: 12/1/14
Target Completion: 4/1/14
Phase 4: The final phase of activity for the B4 West Annex project is miscellaneous
interior build-out and site-work activities. This will also include final selective
demolition, site grading, and landscaping activities. Stockpile management and protection
will re-occur during this phase as well. Stockpile management and protection locations
shall be redlined on the final erosion control plan at as necessary during this phase.
Finally, near the end of Phase 4, stabilization activities will begin and final BMPs will be
placed.
Target Start: 4/1/14
Target Completion: 7/1/14
B. STORMWATER MANAGEMENT CONTORLS:
SWMP ADMINISTRATOR:
Mike Disler, Superintendent
J.E. Dunn Construction Company
2000 S. Colorado Blvd., Suite 12000
Denver, CO, 80222
The SWMP administrator shall be responsible for developing, implementing,
maintaining, and revising the SWMP.
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IDENTIFICATION OF POTENTIAL POLLUTANT SOURCES:
The potential for each of the possible pollutant sources to contribute pollutants to storm
water discharge in the list below have been evaluated with regards to the frequency of the
activity, the physical characteristic of the area, the ability of containment measure to
prevent and contain leaks and/or spills, proximity to waterways or drainage facilities, the
concentration and toxicity of materials and the possible contamination of storage
facilities and materials. If it was determined that the source has a reasonable chance of
contributing pollutants to storm water discharge, a specific BMP or combination of
BMPs has been identified to address or mitigate that potential.
All Disturbed and Stored Soils:
Disturbed Area: 8.80 acres
Location of Stockpile: Proposed stockpile locations have been shown on the plans. At the
discretion of the SWMP Administrator, actual stockpile locations may vary during
construction; however, the current location of stockpiles shall be accurately reflected by
redlining the construction plan set.
BMP’s: Temporary and Permanent Seeding, Mulching, Stockpile Management, Silt Fence,
Inlet Protection, Street Sweeping and Vacuuming, Construction Fence, Surface
Roughening, Rock/Curb Socks
Demolition of Existing Structures:
Demolition of existing structures will produce visible dust, debris and waste requiring
proper containment and disposal. Demolition activities on the B4 West Annex Job
include: selective demolition of the existing Building 4 west wall for new addition and
demolition of asphalt and concrete paved areas to provide for the new building site. S-
Fence will be used to ensure no sediment leaves the site. Additionally, curb socks may
be utilized where necessary and as required to reduce the risk of sediment leaving the
construction site.
BMPs: Spill Prevention and Containment, Inlet Protection, Good Housekeeping,
Construction Fence.
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Vehicle Tracking of Sediment:
In order to prevent sediment from leaving the site via exiting vehicles, a vehicle tracking
control pad shall be used for site access. Construction fence shall be used to limit access
to the site from any area other than through the vehicle tracking control pad. Street
sweeping shall occur whenever sediment is carried onto the street from the site. Nearby
inlets shall be protected.
BMP’s: Vehicle Tracking Control, Construction Fence, Street Sweeping and Vacuuming,
Inlet Protection
Management of Contaminated Soils:
Pre-existing contaminated soils are not anticipated. The following BMP’s shall be
implemented to prevent contamination, and control contamination in the event of a spill:
BMP’s: Good Housekeeping Practices, Stabilized Staging Area, Spill Prevention,
Containment and Control
Loading and Unloading Operations:
Loading and unloading operations can result in particulate generation, which can be
carried off the site and ultimately collected by runoff.
BMP’s: Where possible, dump trucks and waste trucks entering/exiting the site shall be
covered. The property shall be watered to avoid particulate generation from
loading/unloading.
Outdoor Storage Activities:
Wherever possible, chemicals shall be stored in a covered location to prevent rainwater
from directly impacting storage containers. The spill prevention, containment, and
control BMP shall be utilized minimize risks from storing chemicals outside. Workers on
the site shall be trained in spill prevention, containment, and control.
BMP’s: Spill Prevention, Containment, and Control
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Vehicle and Equipment Maintenance and Fueling:
On-site vehicle equipment maintenance and fueling increases the risk for spilling the
chemicals used for these activities. Where practical, these activities should occur off-site.
When on-site fueling and maintenance is warranted, it shall occur on the stabilized
staging area.
BMP’s: Good Housekeeping Practices, Stabilized Staging Area, Spill Prevention,
Containment and Control
Sawcutting:
Sawcutting asphalt and concrete has the potential to introduce sediment into stormwater
runoff. Downstream inlets shall be protected.
BMP’s: Street Sweeping and Vacuuming
Significant Dust or Particulate Generating Processes:
Dump Trucks and waste trucks shall be covered whenever possible. Water shall be used
to minimize particulate generation. The City of Fort Collins requires that the site be
continuously watered in order to minimize particulate generation from wind. If
particulate accumulation results in sediment deposit outside of the site, street sweeping
should occur immediately.
BMP’s: Street Sweeping and Vacuuming
Routine maintenance activities involving fertilizers, pesticides, detergents, fuels,
solvents, oil, etc:
Wherever possible, chemicals shall be stored in a covered location to prevent rainwater
from directly impacting storage containers. The spill prevention, containment, and
control BMP shall be utilized minimize risks from storing chemicals outside. Workers on
the site shall be trained in spill prevention, containment, and control.
BMP’s: Spill Prevention, Containment, and Control
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On-site waste management practices:
Trash, demolition debris, and waste can be carried by storm water runoff, contaminating
runoff water, and clogging existing facilities. To mitigate this risk, dumpster should be
closed whenever feasible. Dumpsters and/or waste piles shall be located a minimum of
50ft from any inlet structures or watercourses.
BMP’s: Good Housekeeping Practices
Dedicated asphalt and concrete batch plants:
No dedicated asphalt or concrete batch plants will be used on site.
BMP’s: None.
Concrete truck/equipment washing, including the concrete truck chute and associated
fixtures and equipment:
Concrete waste including waste produced after washing trucks, pumps, and associated
fixtures and equipment can be easily tracked onto adjacent streets with the potential to
contaminate stormwater runoff. Concrete washout areas are specifically indicated on the
plans and should be located a minimum of 50ft from any inlet structures or watercourses.
At the discretion of the SWMP Administrator, actual concrete washout locations may
vary during construction; however, the current location of concrete washouts shall be
accurately reflected by redlining the construction plan set.
BMP’s: Concrete Washout Area
Non-industrial waste sources such as workers trash and portable toilets:
Good housekeeping shall be practiced on site in order to eliminate stormwater
contamination risk from worker trash and portable toilets. Provide an adequate amount of
trash bins in order to encourage compliance across all workers. Stake portable toilets to
the ground in order to minimize the risk of overturning. Updated portable toilet locations
shall be redlined on the construction plan set. Portable toilets shall be located a minimum
of 50ft from any inlet structures or watercourses.
BMP’s: Good Housekeeping
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DESCRIPTION OF STRUCTURAL AND NON-STRUCTURAL BMP’S
In addition to the descriptions below, the contractor is encouraged to refer to the “Urban
Storm Drainage Criteria Manual – Volume 3” for comprehensive BMP information
Temporary and Permanent Seeding (TS/PS)
Final stabilization for landscaped areas will be achieved when vegetation has achieved
cover which matches the existing vegetative cover. Because a large area of native grass
will be replaced with permanent seeding, vegetative cover is expected to be improved
from existing conditions as a result of the proposed development. If temporary seeding
becomes necessary, the following seed mix or approved equal shall be used:
Good Housekeeping Practices (GH)
Good housekeeping is a source control BMP. Good housekeeping practices are designed
to maintain a clean and orderly work environment. Poor housekeeping practices result in
increased waste and potential for stormwater contamination. A cleaned and orderly work
site reduces the possibility of accidental spills caused by mishandling of chemicals and
equipment.
Vehicle Tracking Control (VTC)
Vehicle Tracking Control is a sediment removal device for construction equipment and
vehicles entering/exiting the site (as described in the UDFCD criteria). Vehicle tracking
control pads shall be installed at the single access point to the site (at the west drive cut
for the Ring Road) prior to any land-disturbing activity. VTC pads shall be maintained in
working order according to the VTC detail in the erosion control plans.
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Stabilized Staging Area (SSA)
The stabilized staging area shall be used for parking, storage, and unloading and loading
operations. The SSA shall consist of 3” minimum thickness of granular material, and
shall be large enough to fully contain parking, storage, and unloading and loading
operations. For this PROJECT site, the existing asphalt parking lot will be used as a SSA
until demolition. After demolition, a new SSA must be installed.
Construction Fence (CF)
A construction fence restricts site access to designated entrances and exits and delineates
construction site boundaries.
Concrete Washout Area (CWA)
The Concrete Washout Area is a sediment-trapping device as described in the UDFCD
criteria. Concrete washout area(s) shall be installed prior to any concrete placement on
site. All concrete delivery truck chutes, concrete pumps, and any other concrete placing
devices shall be cleaned out at the designated concrete washout area. The discharge of
water containing concrete waste and/or sediment to adjacent waterways, wetlands, other
properties, etc. is prohibited. The contractor shall redline the approved SWMP located in
the construction trailer to indicate the current location of all CWAs.
Stockpile Management (SM/SP)
Stockpile management includes measures to minimize erosion and sediment transport from soil
stockpiles. It should be used when soils or other erodible materials are stored at the construction
site. Special attention should be given to stockpiles in close proximity to natural or manmade
storm systems. Updated SM/SP locations shall be redlined on the approved SWMP located in the
construction trailer. This includes the location of the final SM/SP during Phase 4 of construction.
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Silt Fence (SF)
Silt Fence is a sediment-trapping device as described in the UDFCD criteria. Silt fence is to be
inspected and repaired/replaced as necessary. Silt fence will only be used for stockpile protection
for this Project because natural berms will prohibit sediment-laden runoff from exiting the site.
Street Sweeping and Vacuuming (SS)
Street sweeping is required when sediment has washed onto paved surfaces. This is to be done in
a timely manner either by hand or street sweeper at a minimum of one time per week. Flushing of
sediment with water is prohibited.
Surface Roughening (SR)
Any disturbed areas which have not reached final stabilization within two weeks of being
disturbed shall receive surface roughening.
Rock/Curb Socks (RS/CS)
A rock sock is constructed of gravel that has been wrapped by wire mesh or a geotextile to form
an elongated cylindrical filter. Rock socks are typically used either as a perimeter control or as
part of inlet protection. When placed at right angles in the curb line, rock socks are typically
referred to as curb socks. Rock socks are intended to trap sediment from stormwater runoff that
flows onto roadways as a result of construction activities. Rock socks shall be installed on the
proposed 3’ concrete pans once constructed.
Inlet Protection (IP)
Inlet protection shall be used at all of the locations shown on the approved SWMP plans. Inlet
protection for proposed inlets should be installed immediately after proposed inlet installation.
Inlet protection is to be inspected and repaired/replaced as necessary.
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Sediment Control Log (SCL)
Sediment Control Log (SCL) is a linear roll made of natural materials such as straw, coconut
fiber, or other fibrous material trenched into the ground and held with a wooden stake (“straw
wattles”) as described in the UDFCD criteria. SCLs shall be installed as shown on the approved
SWMP plans in order to function as a check dam in the proposed grass swale. SCLs shall be
installed as soon as the grass swale is graded. SCLs are to be inspected and repaired/replaced as
necessary. SCL’s shall extend a minimum of 10’ total in length and shall be centered on the
bottom of the grass swale.
MATERIAL HANDLING AND SPILL PREVENTION
If a spill should occur, the City of Fort Collins (970) 224-6015, and the Colorado
Department of Public Health and Environment (1.877.518.5608) must be notified.
The contractor shall keep specific procedure manuals for material handling information,
accident procedures, and spill handling. At a minimum, the contractor shall adhere to the
following:
Material and Equipment Storage:
Nonhazardous materials that are to be stockpiled on the site but not installed within 14
days of arrival shall be stored in the construction staging and/or material storage area.
Materials delivered to the site which will be installed within 14 days of arrival may be
stored nearer to the point of installation. These materials include but are not limited to
pipe, precast structures, fire hydrants, tees, valves, and misc. fittings. Construction and
maintenance equipment such as hand tools and small parts shall be stored within the
stabilized storage area or materials storage area in watertight containers. Hazardous
materials that are to be stored on-site such as, but not limited to, oil filters, petroleum
products, paint, and equipment maintenance fluids shall be stored in structurally sound
and sealed containers clearly marked “Hazardous Material”. These containers are to be
located within the stabilized storage areas and/or material storage area.
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Spill Response/Management of Contaminated Soils:
• Containment and cleanup of spills should begin promptly after the spill is
observed
• Contain medium sized spills with absorbents (e.g., kitty litter, saw dust)
and use inflatable berms or absorbent snakes as temporary booms for the
spill. Store and dispose of absorbents properly.
• For large spills, first contain the spill and plug storm drain inlets where the
liquid may migrate off-site, then clean up the spill.
• Excavation of spill areas to removed contaminated material may be
required where large spills occur on unpaved surfaces.
• Contain the entire spill if possible. If immediate containment is not
possible, use curbing to route spilled material to a collection basin. The
containment area must have an impermeable surface.
• Material from the spill area must be disposed of or recycled according to
local, state, and federal standards.
Vehicle and Equipment Fueling and Maintenance:
The fueling of vehicles and equipment which occurs on site shall occur in the stabilized
storage area. Only minor equipment maintenance shall occur on-site. All major
equipment maintenance shall be performed off-site. Any equipment fluids generated from
maintenance activities will be disposed of into designated drums stored on spill pallets.
Absorbent, spill-cleanup materials and spill kits shall be available at the stabilized storage
area and/or materials storage area. Drip pans shall be placed under all equipment
receiving maintenance. Drip pans shall also be placed under vehicles and/or equipment
parked overnight which have known fluid leaks.
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Waste Management and Disposal, Including Concrete Washout:
All hazardous waste materials shall be disposed of in structurally sound and sealed
containers located within a hazardous materials storage area in the stabilized storage area.
Hazardous waste materials will be stored in appropriate and clearly marked containers
and segregated from other non-waste materials. Secondary containment shall be
provided for all waste materials in the hazardous materials storage area and will consist
of commercially available spill pallets. Additionally, all hazardous waste materials shall
be disposed of in accordance with federal, state, and municipal regulations. Non-
hazardous waste materials may be disposed of into on-site dumpsters. Construction trash
dumpsters should be located in the stabilized storage area. Dumpsters should have a
secure lid and meet all federal, state, and municipal regulations. Only trash and
construction debris from the site should be deposited in these dumpster. No construction
materials shall be buried on-site.
All construction personnel shall be instructed regarding the correct disposal of trash and
construction debris, as well as procedures for hazardous waste disposal. The SWMP
Administrator shall be responsible for seeing that these practices are followed.
C. SEQUENCED BMP IMPLEMENTATION
GENERAL
• Good Housekeeping
• Material Handling and Spill Prevention
INITIAL
Refer to sheet C202.
Prior to Asphalt Demolition, Clear and Grub
• Install VTC (VTC shall be installed as soon as possible during
demolition. Limit site access until VTC is in place. Construction fence
around VTC should limit access to site through the VTC only
• Install Existing Inlet Protection
• Install Construction Fence
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During and immediately following Asphalt Demolition, Clear and Grub
• Limit disturbance to those areas planned for disturbance and protect
undisturbed areas within the site with construction fence, flagging, etc.
• Sweep or Vacuum sediment as needed.
Maintenance
• Inspect all BMP’s after every precipitation event, and at a minimum of
once per week
• Replace/repair BMP’s as necessary
• Check for sediment deposition on streets and sweep daily
INTERIM
Refer to sheet C203.
Before Over-lot Grading
• Install Stabilized Staging Area (Install construction trailer, stake portable
toilets, and lay down dumpsters as needed)
During Site Grading/Foundation Excavation
• Implement stockpile management
• Install Silt Fence around stockpiles
• Stockpiles shall be no higher than ten feet
• Water the site as needed to prevent dust from wind and
loading/unloading operations. Do not water to the point that runoff is
created.
• Implement Surface Roughening and/or Temporary Seeding as required
• Install SCL as soon as grass swale is graded
During Vertical Construction
• Concrete Washout Areas as needed
• Implement materials management and good housekeeping practices
• Use perimeter controls for temporary stockpiles from foundation
excavations
During Paving/Concrete Installation
• Concrete Washout Areas as needed for concrete paving
• Install rock socks at 3’ concrete chases
During Utility installation
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• Install inlet protection immediately after inlets are installed
Maintenance
• Inspect all BMP’s after every precipitation event, and at a minimum of
once per week
• Replace/repair BMP’s as necessary
• Check for sediment deposition on streets and sweep daily
• Dispose of Concrete Washout Areas in a timely fashion.
• Update Erosion Control Plans to reflect current locations of major
BMP’s including SSA, CWA, and SP
FINAL
Refer to sheet C204.
• Install permanent seeding in landscaped areas shown on the plans
• Do not remove BMP’s until final stabilization is achieved
• In landscaped areas, individual plant density of at least 70% is required
• Implement stockpile management if necessary for final grading. Redline
location on approved plan in construction trailer.
Maintenance
• Inspect all BMP’s after every precipitation event, and at a minimum of
once per week
• Replace/repair BMP’s as necessary
• Check for sediment deposition on streets and sweep daily
• Dispose of Concrete Washout Areas in a timely fashion.
D. INSPECTION AND MAINTENANCE
PROCEDURES
The erosion and sediment control measures shall be inspected by the contractor and
evaluated continually throughout the construction period. Inspections shall be performed
weekly and after all storm events resulting in precipitation of one-half inch or more.
Inspections shall also be required after significant snowmelt events which have the
potential to cause surface erosion. Inspections required after storm and/or snowmelt
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events shall be conducted in a timely manner, but no more than 24 hours after the end of
the storm event. If construction activities have been completed, but final stabilization has
not yet been achieved, the frequency of inspections may be reduced to once every thirty
(30) days.
Inspections shall be conducted and findings documented pursuant to the State Permit.
Inspections shall be recorded on an inspection form acceptable to both the State of
Colorado and the City of Fort Collins. See the Appendix for a sample inspection form.
Inspections shall ensure adherence to all state and local jurisdictional requirements.
Inspections shall also ensure compliance with the erosion control measures stipulated in
this report. Lost or damaged erosion and sediment control devices shall be noted in the
inspection report and shall be repaired or replaced in a timely manner, but in no case
more than seven (7) days after the inspection. Ineffective or inadequate devices shall also
be noted in the inspection report and should be modified or replaced with an adequate
device. Replacement and/or modification of ineffective or inadequate devices shall be
completed in a timely manner, but in no case more than seven (7) days after the
inspection. Any observed differences or modifications to the SWMP made after an
inspection shall be shown on an updated SWMP in a timely manner.
Any reports of non-compliance and/or violations shall be recorded. A brief explanation
shall detail how the instance of non-compliance and/or violation was rectified, and how
future violations will be avoided. The report shall then be signed indicating that site is
once again in compliance by both the individual performing the inspection and the
SWMP administrator.
The permit operator shall keep a record of all inspections on site with the SWMP Plan.
These records shall be made available to the City of Fort Collins or other authorities
having jurisdiction upon request.
Wherever inspection requirements differ between governing jurisdictions and/or this
SWMP, the more stringent requirements shall apply.
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E. FINAL STABILIZATION
Final stabilization will be achieved when all disturbed areas have either been paved with
asphalt/concrete or landscaped according to the project design plans. In landscaped areas, an
individual plant density of at least seventy (70) percent is required for final stabilization.
SOIL AMMENDMENTS
Refer to the approved landscape plans for the required soil amendment.
PERMANENT SEED MIX
Refer to the approved landscape plans for the permanent seed mix.
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F. REFERENCES
1. Colorado Department of Public Health and Environment, Water Quality Control
Division – Stormwater Program, “Stormwater Discharges Associated with
Construction Activity, Stormwater Management Plan Preparation Guidance”,
revised 4/2011
2. Urban Storm Drainage Criteria Manual, Volumes 1-3, Urban Drainage and Flood
Control District, Rev. June 2001, Internet rev. October 2007.
3. “RE: Erosion Control Report and Drawing Requirements Accompanying
Document”. Received 2/6/2012 via email from Jesse Schlam, City of Fort Collins,
Utilities. JSchlam@fcgov.com
miles
km
1
1
ENGINEER'S OPINION OF PROBABLE COST
Project: AVAGO B4 WEST ANNEX Date: 25-Mar-13
Location: 4380 ZIEGLER ROAD Job No.: 13.0091
Subject: SECURITY CALCULATIONS Prep. By: BMS
Client: AVAGO TECHNOLOGIES Ckd. By: PB
Note: Any opinions of price, probable project costs or construction costs rendered by MARTIN/MARTIN represent
its best judgment and are furnished for general guidance. MARTIN/MARTIN makes no warranty of guarantee,
either expressed or implied as to the accuracy of such opinions as compared to bid or actual cost.
Item No. Item Description Units Quantity Unit Price Item Cost
1 Concrete Washout Area EA 3 $ 100.00 $ 300.00
2 Construction Fence LF 3720 $ 2.00 $ 7,440.00
3 Inlet Protection EA 17 $ 20.00 $ 340.00
4 Seed AC 6.8 $ 2,500.00 $ 17,000.00
5 Stabilized Staging Area SF 40000 $ 0.25 $ 10,000.00
6 VTC EA 1 $ 1,000.00 $ 1,000.00
7 Curb Sock/Rock EA 5 $ 10.00 $ 50.00
8 Sediment Control Log EA 5 $ 20.00 $ 100.00
Remarks: Cost of Items: $ 36,230.00
50% Contingencies: $ 18,115.00
Subtotal: $ 54,345.00
Total Cost: $ 54,345.00
Cost to Revegetate only = $22,000 (seed all
disturbed area)
run date: 3/25/2013 1:12 PM Page 1 of 1