HomeMy WebLinkAboutCT 01-08; NORTHPOINTE WEST; CONCEPT WATER QUALITY PLAN; 2001-09-01K&S ENGINEERING
Planning Engineering Surveying
CONCEPT WATER QUALITY PLAN
FOR
NORTIIPOINTE WEST
PROJECT
May 2001
(Revised July 2001)
(Revised September 2001)
Prepared for:
CARLTASDEVELOPMENTCOMPANY
5600 Avenida Encinas, Suite 100
Carlsbad, CA 92008-4452
USA
7801 Mission Center Court, Suite 100 • San Diego, California 92108 • (619) 296-5565 • Fax (619) 296-5564
TABLE OF CONTENTS
Section Page
1
1
2
1.0
2.0
3.0
Introduction ............................................................................................... .
Project Background .............................................................. : ....................... .
Response to Planning Department Review .............................. : ............................ .
3.1 Encinitas Creek Water Surface Calculations........................................................... 2
3.2 Parking Lots................................................................................................ 2
3.3 All Development........................................................................................... 2
4.0 Project BMP Plan Implementation...................................................................... 3
4.1 Construction BMP....................................................................................... ... 3
4.2 Municipal/Post-Construction BMP Options............................................................ 4
5.0 Conclusion .............................................................................................. ·..... 5
FIGURES
1. Water Quality and Drainage Control Plan
2. Lincoln Northpointe As-Built Composite Plan
APPENDICES
1. Construction BMPs
2. Post-Construction Treatment Control BMPs
3. Post-Construction Proprietary BMPs
4. Addendum to Preliminary Drainage Study
1.0 INTRODUCTION
The California State Water Quality Control Board approved Order Number 2001-01 (Order) on February
21, 2001. The Order outlines the storm water discharge requirements for municipal storm water systems,
which drain "development" area from watersheds within 1) the County of San Diego, 2) incorporated cities
of San Diego County, and 3) San Diego Unified Port District. The City of Carlsbad is identified as one of
the municipal co-permittees in the order and, therefore, subject to its requirements.
This "concept" water quality report was prepared to define the potential Project Best Management Practice
(BMP) options that satisfy the requirements, identified in the following documents: 1) Carlsbad Municipal
Code Stormwater Management and Discharge Control Ordinance, 2) Standard Specifications for Public
Works Construction, 3) NPDES General permit for Storm Water Discharges Associated with Construction
Activity, and 4) County of San Diego Municipal NPDES Storm Water Permit (Order Number 2001-01).
Specifically, this report includes the following: 1) response to the water quality concerns endemic to the
Project, included in Preliminary Review from City Planning Department. 2) three preliminary BMP options
for the Project, and 3) BMP device information for the three concept Project Options.
2.0 PROJECT BACKGROUND
A preliminary Drainage Study/Hydrology report for Northpointe West was originally prepared and
submitted to the City of Carlsbad (City) in March 2001 by K & S Engineering and a Hydrogeologic
Evaluation Report was originally prepared and submitted in October 1998 by Kahl Environmental Services
for the Northpointe Property. The project has been in preliminary review by the City Planning Department,
which raised concerns of how criteria in the above order will be met.
In general, the order requires that BMPS 1) control the post-development peak storm water storm discharge
rates and velocities to maintain or reduce pre-development downstream erosion 2) minimize storm water
pollutants of concern in urban runoff from new development through implementation of source control
BMP'S, 3) remove pollutants of concern from urban runoff through implementation of structural treatment
BMP'S and 4) include proof of a mechanism, to be provided by the project proposal, which will ensure
ongoing long-term structural BMP maintenance. Also structural BMPS shall be located so as to infiltrate
filter, or treat the required runoff volume or flow (numeric sizing criteria) prior to discharge to any
receiving waterbody supporting beneficial uses.
This "numeric sizing criteria" is either volume or flow based. Specifically, volume based BMPS must be
designed to infiltrate, filter, or treat the volume of runoff produced from a 24-hour -85 percentile storm
event. This is approximately 0.6 inches of runoff for San Diego County. Similarly, flow based BMPS must
be designed to infiltrate, filter or treat a flow rate of 0.2 inches of rainfall per hour. Note that the above
"numeric sizing criteria" allows the option of infiltration, filtering or treatment of this volume/flow and
relates only to water quantity. Retention or detention of water volume/flow is not a requirement of the
"numeric sizing criteria."
3.0 RESPONSE TO CITY PLANNING DEPARTMENT REVIEW
As mentioned in the introduction, the project must be designed in compliance with all applicable
stormwater and water quality ordinances. This includes compliance with .all applicable storm water and
water quality ordinances. This includes compliance with the NDPES Storm Water Permit for Construction
Activity and Order Number 2001-01. The following addresses the specific BMP requirements of the above.
3.1 Industrial Development
In order to meet the specific industrial development requirements of the site, an erosion control and BMP
plan will be prepared that addresses treatment BMPS (numeric sizing criteria) and location of post-
construction BMP devices. The following are potential BMPS that may be used, in addition to the BMPS
identified in section 4.0 that meet the requirements of order 2001-01.
• A SWPPP will be prepared for the Northpointe West project, the SWPPP will include the
following:
Define BMPS
Notice of intent
Inspection and maintenance of BMPS
SWPPP amendments as construction evolves
Post construction SWPPP
Financial responsibility/maintenance agreements
Notice of termination
• Erosion control devices will be used during construction and also implemented as a part of a post
development plan.
• Runoff from driveways, parking and other impervious areas may be collected and treated by media
filter devices such as catch basin inserts (fossil filters). The adequacy of these fossil filters to treat
the required volume/flow is specified in section 4.0.
3.2 Parking lots
Runoff from parking lot areas will be treated through the use of media filtration devices, or other feasible
BMPs such as vegetated strips and in-line treatment structures.
3.3 All Development
A public education and landscape management plan will be incorporated into the project. The elements of
the plan may consist of catch basin stenciling, public awareness signs, and herbicide/pesticide management.
These elements will be addressed in a water quality/urban runoff control plan (Plan) for the Project, and are
subject to the municipal code.
2
4.0 PROJECT BMP PLAN IMPLEMENTATION
This section identifies a preliminary Plan BMP plan design that meets the above water quality criteria
requirements. The plan was developed per the proposed roadway and lot layout/density associated with the
site. BMP's other than those identified in the plan, may be used during final engineering.
The following Sections address the use of construction-and post-construction BMPs. Note that the three
BMP Project options are discussed in Sections 4.2 and 4.3.
4.1 Construction BMP
K & S will prepare a Strom Water Pollution Prevention Plan (SWPPP) for the project. The SWPPP will be
approved pending final approval of the construction documents.
During construction, BMPs such as desilting basins and other erosion control measures will be employed,
consistent with the NPDES Strom Water Pollution Prevention Program. The objectives of the SWPPP are
to:
1) Identify all pollutant sources, including sources of sediment that may affect the water quality of
stormwater discharges associated with construction activity from the construction site;
2) Identify non-stormwater discharges;
3) Identify, construct, implement in accordance with a time schedule, and maintain BMPs to reduce
or eliminate pollutants in stormwater discharges and authorized non-stormwater discharges from
the construction site during construction; and
4) Develop a maintenance schedule for BMPs installed during construction designed to reduce or
eliminate pollutants after construction is completed (postconstruction BMPs). BMPs, in addition to
desilting basins, may include silt fences, sand bags, and gravel bags. See Appendix 2 for
Construction BMPs.
3
4.2 Post-Construction BMPS
POST DEVELOPMENT PEAK FLOW
As shown by Appendix 4, the hydrograph analysis for the Lincoln Northpointe 50acre project site
(including Northpointe West) demonstrates that development of the project reduces the peak flow
downstream (Encinas Creek). Similarly, development ofNorthpointe West will also reduce the peak flow in
Encinas Creek. Thus, the development will also not increase erosion in Encinas Creek.
SOURCECONTROLBMPS
The "California Storm Water Management Practice Handbook" identifies six categories to reduce post-
construction source pollutants. These are; 1) planning management 2) materials management 3) spill
prevention 4) illegal dumping 5) illegal connections and street storm drain maintenance.
A public education and landscape management plan will be incorporated into the project. The elements of
the plan may consist of catch basin stenciling, public awareness signs, and herbicide/pesticide management.
These elements will be addressed in a water quality/urban runoff control plan (Plan) for the Project, and are
subject to the municipal code.
STRUCTURAL TREATMENT BMPS
• Fossil filters will be installed at all catch basins onsite. The 24"x24" catch basin with fossil filter can
treat at least 92 GAL/MIN or 0.2 CFS (per filtration capacity chart), which meet the flow/volume
criteria in Order 2001-01. Also note that the hydraulic capacity for the 24"x24" catch basin (per the
flow rate chart) is 1.18 CFS. Therefore, the maximum acreage draining to each catch basin is
approximately 5.9 acres. Backup information on the capacity of the fossil filters to treat the required
volume is shown in Appendix 3.
• Fossil filters will also be placed at all roof drain inlets that flow directly into the storm drain system.
• A vegetative swale will be provided along the easterly and northerly drive at the toe of the existing
2: 1 slope to mitigate slope fertilizer run-off pollutants.
• The existing lots/buildings within the previous subdivision have fossil filters installed on the existing
catch basins within the subdivision (Figure 2.)
FINANCIAL RESPONSIBILITY /BMP MAINTENANCE:
The owner/developer of the project will be financially responsible for construction/installation of the post-
development BMPS and implementation of the SWPPP. An onsite association will perform the
maintenance of the fossil filters, as well as the private onsite storm drains and landscaping.
4
5.0 CONCLUSION
This concept water quality report has been prepared in response to the City Planning Department significant
issues, and to define potential Best Management Practices (BMP's) that satisfy the requirements identified
in the following documents: 1) Carlsbad Municipal Code Stromwater Management and Discharge Control
Ordinance, 2) Standard Specifications for Public Works Construction. 3) NPDES General Permit for Storm
Water Discharges Associated with Construction Activity issued by the State Water Resources Control
Board, and 4) San Diego NPDES Municipal Storm Water Permit (Order Number 2001-01)
Thus, it has been shown that this project can meet the water quality objectives as outlined in Order
2001-01 as shown on the proposed site plan. An analysis has been performed to ensure that the site
plan can accommodate the water quality BMPS. Therefore it is not anticipated that the site plan will
be affected by the implementation of the water quality BMPS.
5
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LEGEND
FOSSIL FILTER DEVICE
DRAINAGE STRUCTURE FLOW
SURF ACE FLOW
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K&S ENGINEERING
Plaviing Engineering S.rve)ing
7801 l6ssioll c..,1.,. Court. Sua, 100
Ser, Diego. CA 9210&
VEGETATED SWALE
DRAINAGE AREA
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PREUllllOJ!Y YATER QUWTY OlUDIAGE COlll'ROL Pl.All ,OR
NORTH POINlE WEST
LOTS 9-12, CARLSBAD lRACT NO. 98-07
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APPENDIX 1
Construction BMPs
Z:\Data-Z\word\PROJECI\00-111\APPENDIX.doc
I
4. BA1Ps FOR CONTRACTOR ACTIVITIES
This chapter
describes specific
Best
Management
Practices (B MPs)
for common construction activities that may
pollute s1orm water. Chapter 2 led you through
the steps of identifying activities at your site
that can pollute stonn water, wh.ile Chapter 3
provided guidance on BMP selection. lhis
chapter will provide a list of BMPs that can be
used to fit your sire's needs.
BMP fact sheets are provided for each of the
conuac1or's ac1ivi1ies, noted in the box. are
consistent with Worksheet 4 in Chapter 2.
Each fact sheet contains a cover sheet with:
A description of 1he BMP
Approach
Requiremenls
Costs, including ~apital costs. and
operation and maintenance
(O&M) coslS
Mainlenancc (including
administrative and staffing)
• Limitations
References
1llc side bar presents informatiorr on which
BMP objective applies, targeted constituents,
and an indication of the leve .. of effort and costs
to implement. For some BMPs, further
information is provided in additional sheets.
Construction Handbook
Contractor Activities
Construction _Practices
CA I De watering Operat.ioos
CA2 Paving Operations
CA) Slructure Construct.ion and
Painting
Material Manag!rmnt
CA 10 Material Delivery and St.0rage
CA 11 Maicrial Use
CAl2 Spill Prevention and Conuol
Waste Manacement
CA20 Solid Waste Management
CA21 Hazardous Waste Managemenc
CA22 Contaminated Soil Management
CA23 Concrete Waste Management
CA24 Sanilaf)'/Septic Waste
Management
Vehicle and Equipment Mana~ment
CA)O Vehicle and E.quipmcnt Cleaning
CAJI Vehicle and E.quipmcnt Fueling
CA32 Vehicle and E.quipmcnt
Maintenance
Contractor Training
CA40 EmployedSubconuactor Training
lbese BMP fact sheets arc sui1able for inclusion
in many storm waler pollution prevention plans
foe typical contractor activities. 1nc BMPs
listed are OOl an exhaustive list, nor will every
BMP be appropriate for every situation.
lbercfore. sugges1ed BMPs wh.ich arc
inappropriate may be deleted and additional
BMPs for specific site conditions should be
added. In addition, your selection and
implementation of BMPs should be reviewed on ·
a regular basis 10 match the changing conditions
at construction sites.
4 -1 March, 1993
~ a ::f C ,.,
C: 0 :I
:c ..
& i
... • N
~ ., ., ,.,
Jfil' -~
CAOI ·
CA02
CA03
CAIO
CAIi
CAl2
CA20
CA2I
CA22
CA23
CA24
CA30
CA3I
CA32
CA40
TADLE 4.1 CONTRACTOR ACTIVITIES AND DMP ODJECTIVES
OMP OBJECT(VES
PR.ACTTC£ PROTECT
GOOD MINIMIZE STA DI Lil£ SLOPES CONTROL CONTROL
HOUSE, CONTAIN DISTURBED OISTURDED AND SITE INTERNAL
BMP CATEGORY KEEPING WASTE AREA AREA CHANNF:LS PF.RIM HER EROSION
Con.structlon Practices
Dewarerin2 Onerations ✓ ✓ ✓ ✓
Pavine Ooerations ✓
Structure Construction and Painting ✓ ✓
Material Mana2ement
Material Delivery and Stora2e ✓
MateriaJ Use ✓
Spill Prevention and Control ✓
Waste Man12ement
Solid Waste Manncement ✓
Hl\Zardous Waste Man:il!ement ✓
Contaminated Soil Mllllaeement ✓ ✓ ✓
Concrete Waste Mann2ement ✓
SMltary/Septic Waste MMa2ement ✓
Vehicle and Eoulpment M1n1aement
Vehicle and Equipment Cleanin2 ✓ ✓ ✓
Vehicle and EQuipment Fuelin2 ✓
Vc~icle and Equipment ✓ Maintenance
Contractor Tr1lnlnsz
Employee/Subcontractor Training ✓ ✓
(
ACTIVITY: DEWATERING OPERATIONS
}
DESCRIPTION
Prevent or reduce I.be discharge or poUuunts lO slOnJI wata from dcwalaing operations
by using sediment roocrols and by le.sting I.be gTOuodwa&cr for pollution.
APPROACH
There are two geocral classes of pollutants lha1 may result from dewal.Criog operations;
sedimeut, and 10xics and pc1roleum products. A high sediment coo&cnt io dcwa1a1ng
disdwges is common because or the nalllt'C or the operation. Oo I.be other band. 10xics
and petroleum products are DO( commonly found in dcwa1.eriog discharges unless, I.be site
or SWTounding area bas been used for light or heavy industrial activities.. Of the area bas a
history or grouodwa1.er contamination. The following s&cps will help reduce storm wau:r
pollution from dewat.cring discharges:
Sediment
Use sediment controls to remove sedimenl from water generated by dewalCring (Sec
Sedimcnl Trap (ESC 55) and Sedimenl Basin (ESC 56) in Chapter 5).
Use filtration to remove sediment from a sedimcnl trap or basin. Fillratioo can be
achieved with:
Sump pit and a pcrfcr.ucd or slil standpipe with boles and wrapped in fi.ltct
fabric. 11,c standpipe is surrounded by stooes which fallen I.be water as it
c.oUects iD I.be pit before beiog pumped out. Wrapping tbc standpipe in filter
fabric may require ao increased suctioo inlet area IO avoid clogging and unac-
ccpcablc pump opcralioo.
Aoaling suctioo hose IO allow cleaner surface waler lo be pumped ouL
JoxiQ and PtlJOlC]llD, PrndUCJ:s
• In areas suspeacd of having groundwater pollutioo, sample I.be poundwatc:t DC.at lbc
excavatioo siLe and have lbc waler tested for known or suspoclCd pollutants al a
c.enified Labora&oJy. Oed: with the Regiooal Waaa Quality Coocrol Board and lbc
local wastcwa&er tn:abDcut plaot for their ~uiremcots for dewaacriog, additiooal
waler quality lcsas. and disposal options.
• Wilb a permit &om the RegiooaJ Wau::r Quality Cooa-ol Board, you may be able to
rocyclc/rcusc pumped groundwal.Cr for landscape irrigation, or discharge IO the storm
sewer. With a perm.it Crom lbe local agcocy, you may be able IO lrcal pumped
groundwa~r aod discharge i( lo the municipal wastewater treabncot plaot via the
sanitary sewer.
For a quick rdercoce on wsposa] al1.ematives for specific wasl.CS, sec Table 4.2,
CA40, EmployedSuboontractor Training.
Construction Handbook 4 -3
Objectives
~
Ccntain Wast•
Minima. Disturb.d AINS
Stabi/iu Dislurb.d ArMs
Targeted Pollutants
• Sediment
0 Nutrients
0 Toxic Alllferial.s
0 Oil & Grea5e
0 Floatable Materials
0 Other Con.,trvction
Wa.,te
• LJ••'Y lo H""'• SJgnltsc.nt Imp.ct
0 Pn,bal,J. Low or
UnklN)wn Impact
Implementation
Requirements
0 Cupit•/ Cost•
0 O&MCoai.
0 l.&lntenance
'-Training
0 Suitability for
Slopu>5"
e Hi9', 0 Low
CA1
March, 199)
II
,,
CONTRACTOR ACTIVITY: DEWATERING OPERATIONS (Continue)
-------------------------------------1
REQUIREMENTS
• Costs (Capital. O&M)
Sedimenl controls arc low cos, measures.
Trcatmenl and/or discharge of pollulcd groundwal~ can be qw1c expensive.
• Maintenance
-Maintain sediment controls and fi.Jtcrs in good working order. (Sec Chapter 5 for details)
-Jnspecl excavated areas daily for signs of conwnina1cd waler as evidenced by disroloration. oily sheen. or
odors. .
LIMITATIONS
• 1be prc.scnc:e of contaminal.ed water may indica1e contamina1ed soil as well. Sec CA22 (Contaminated Soil Man-
agemcn1) in this chapter for mo,c informal.ion.
REFERENCES
Blucprin1 for a Ocan Bay-Consuuction-Rcla1ed lndustrics: Best Management Practices for S1onn Watcr PoUution
fuveotion; Sanu Oar.i Valley Nonpoinl Source Pollution Control Program. 1992.
Storm Watez Management for Construction Activities, Developing Pollution Prevention Plans and Best Management
Practices, EPA 832-R-92005; USEPA, April 1992.
CA1
Construction Handbook 4-4
ACTIVITY: PAVING OPERATIONS
Graphic: North Central lexas COG. 1993
DE.5CRIYTION
Prevent or reduce the discharge of pollutants from paving operations. using measures 10
prevent runon and runoff pollution, propctly disposing of wastes, and &raining employees
and subcontractors.
APPROACH
• Avoid paving during wet weather.
• Score materials away from drainage courses lO prevent SIOfUl water runon (sec CA JO
Material Delivery and SIOrage).
Protect drainage courses. particularly in areas with a grade, by employing BMPs ao
divert runoff or 1rap/filt.cr sediment (su Cbapcer 5).
Leaks and spills from paving equipment can contain IOxic levels of bcavy metals and
oil and grease. Place drip pans or absorbent materials under paving equipment wben
noc in use. Clean up spills with absoroent materiaJs rather than burying. Sec CA32
(Vehicle and Equipment Maintenance) and CAl2 (Spill Prevention and ContJol) in
this chapter.
Cover catch basins and manholes when applying seal coat, tack coat. slurry seal, fog
seal, CIC.
Shovel or vacuum saw-cut slwry and remove from site. Cover or baniC3dc slOrm
drains during saw culling lO contain slurry.
• If paving involves portland cement concrete, sec CA23 (Concrete Waste Manage-
ment) in this chapter.
If paving involves aspbaltic concrete. follow th~ steps:
Do not allow sand or gravel placed over new asphalt 10 wash inlO SIOrDI drains..
sllocts, or crocks by sweeping. Properly dispose of Ibis waste by ref~g 10
CA20 (Solid Waste Management) in this chapter.
Old asphalt mu~ be disposed o( properly. Collect and remove all brolccn asphalt
from the site and recycle whenever possible.
If paving involves on-site mixing plant. follow the storm water permitting
requirements for industrial activities.
Train employees and subcoolraCI.OfS.
REQUIREMFNTS
• Costs (Capital. O&M)
All of the above arc low cOSI measures.
• Maintenance
lnspec1 employees and subc.ontracto~ to cnswe thai mcasuses arc being followed.
Keep ample supplies of drip pans or absorbent materials on-site.
LIMITATIONS
• There are no IJ\ajor limitations to this besl management practice.
Conslruclion Handbook 4-5
Objectives
~
Contain Wast,
Minimize Disturbed Areas
Sbbilize Disturbed Areas
Prolect Slopes/ChanMls
Control Site Perimeter
Control Internal Erosion
Targeted Pollutants
0 Sediment
0 Nutrients
0 Toxic Materials
0 Oil & Grease
0 Floatable Materials
0 Other Construction
Waste
• Ulr.•lylDH•v.
Significant Impact
0 Probabl• Low or
Unknown Impact
Implementation
Requirements
0 ,Capital Costs
0 O&AI Costs
0 Maintenance
~ Training
0 Suitability tor
Slopes>5%
• High O Low
CA2
• March, 1993
1,
11
CONTRACTOR ACTIVITY: PAVING OPERATIONS (Continue)
REFERENCES
Blueprint for a Clean Bay-Construction-Related Jndusaies: Best Management Practices for Storm Wa~r Pollution
Prevention; Sant.a Clara VaJlcy Nonpoint Source Pollution Control Program, 1992.
Hot-mix AspbaJt Paving Handbool:. U.S. Army Corps of Engineers. AC 150/5370-14, Appendix J, July 1991.
CA2
Construction Handbook 4-6 Marcia. l'93
ACTIVITY: STRUCTURE CONSTRUCTION AND PAINTING
Graphic: Nonh c__,a, Tex.as COG. 1993
DESCRIPTION
Prevent or reduce the discharge of polluunts IO storm water from structwe construction
and painting by enclosing or covering or bcrming building material storage arc.as, using
good housekeeping practices. using safer alternative products. and training employees and
subcontractors.
APPROACH
Keep lhc wort site clean and orderly. Remove debris in a timely fashion. Sweep the
aru
Use soil erosion conuol 1echniqucs if bare ground is exposed (Sec Chapter 5).
Buy recycled or less hazardous products IO the maximum extent practicable.
Conduct pajnting operations consistent with local air quality and OSHA regulations.
Properly store paints and solvents. Sec CAIO (Malcrial Delivery and Storage) in this
cbapt.cr.
Properly store and dispose waste materials geOCQted from the activi1y. See the wast.c
management BMPs (CA20 IO CA24) in this chapter.
Recycle residual paints, solvents. lumber, and olhcr materials to lhe maximum extent
practicable.
Make sure that nearby stocm drains are well marked 10 minimize lhe chance of
inadvertent disposal of residual paints and od>er liquids.
• Clean the s1orm drain system in the immediat.c construction area afu:r construction is
complcl.ed.
Educaie employees who arc doing the won:.
lnfoon subcontraclOrS of company policy on lhcsc malt.as and include appropriate
provisions in tbcir contract to make ttnain proper boustlecping and disposal
practices arc implemented.
• For a quiet reference on disposal alternatives for specific wast.cs: see Table 4.2.
CA40. Employec/Subcontrac1or Training.
REQUIREMENTS
Costs (Capital. O&M)
These BMPs arc generally oflow 10 moderate c:osL
• Maintenance
Maintenance should be minimal.
LIM IT A TIONS
• Safer alt.emativc products may no( be available. suitable, or effective in every case.
Hazardous waste tha1 cannot be re-used or recycled must be disposed or by a licensed
hazardous waste hauler.
Construction Handbook 4.7
Objectives
Protect Slopes/Channels
Control Sit, Perimeler
Control Internal Erosion
Targeted Pollutants
0 Sediment
0 Nutrients
0 Toxic Materials
0 Oil & Grease • Float able Materials • Other Construction
Waste
• Ult•ly lo Hav•
Slgnlncant Impact
0 Prob•bl• Low or
Unknown Impact
Implementation
Requirements
0 <:;apira/ Costs
0 O&M Costs
0 Maintenance
~ Training
0 Suirability for
Slopes>5%
• High O Low
CA3
March. 1993
II ACTIVITY: STRUCTURE CONSTRUCTION AND PAINTING (Continue)
----------------------------.
Be anain rna1 actions 10 help storm water quality arc consist.col with Cal-and Fed-OSHA and air quali1y rc:gula-
Lions.
Construction and painting activities can genaale pollutants that can reach storm water if proper care is not lalcc:n. 1ne
sourc.c:s of lhese contaminants may be solvents, paints. paint and varnish removers, finishing residues, spent thinners.
soap cleaners. kerosene:, asphalt and concrete materials, adhesive residues. and old asbestos insulation. For specifac
information on some of these wast.cs see the following BMPs in this chaptu: .
CA20 Solid Was1e,
CA21 Hazardous Waste. and
CA23 Concrc:1e Waste.
More specific information on stroeture construction pr.ictices is listed below.
Erosion and SroimeDI Control
Ir the work involves exposing large areas of soil or if old buildings are being torn down and nol replaced in I.be near
fub.lJe, employ the appropriate soil erosion and c.oncrol techniques described in Chapter 5.
S1onn/Sanitaa Sewcc Connections
Carefully install all plumbing and drainage systems. Cross conne.clions between the sanitary and storm drain systems, as
weU as any olber connections into the drainage sys1em from inside a building. arc illegal. Color code or flag pipelines on
lbc: project si1e to prevent such connect.ions. and train construct.ion personnel.
Paiorioc
Local air pollution regulations may, in many areas of the stale. specify painting procedures which if properly canied oul
arc usually sufficicn1 IO protect stOflJl wat.cr quality. These regulations may require that painting operations be properly
enclosed or covered to avoid drifL Use temporary scalfolding 10 bang drop cloths or draperies to prevent drifL Applica-
tion equipment lbal minimizes overspray also helps. When using sealants on wood. pavement. roofs. etc. quickly clean
up spiUs. Remove excess Liquid with absorbent material or rags.
If painting requires scraping or sand blasting of the existing swfac.c. use a drop cloth to collect most of tbc chips.
Dispose the residue properly. Jr the pa.int contains kad or tributyl tin, it is considered a hazardous waste. ·Refer IO the
waste management BMPs in this chapter for more infonnalion.
Mix paint ind~. in a containment area. or in a flat unpaved area oot subject to significant erosion. Do so even during
dry wcatbcr because cleanup oC a spill will never be 100% effective. Dried pa.int will erode from sloped swfaces and be
washed away by storms. If using wa1.er based paints. clean the applicatiofl equipment in a sink that is conneaed to thc
sanitary sewer or in a containment area wbcrc tbe dried pa.int can be readily removed. Properly slOrC lcf10ver paints if
they arc to be k.cpc for l.be next job, or dispose or properly.
Roorwork
Wben worung on roofs. if sm.all particles have accumulated in the guucr, either swc:cp out the guncs or wasb lhe guacr
and trap the particles at I.be outJct of the downspouL A sock or gcofabric placed over the outJct may effectively &rap the
materials. Jr the downspout is lined ligbt. place a temporary plug at lbe first convenient point in the storm drain and
pump out the water with a vactor truc:t. and clean the catch basin sump where you placed the plug.
REFERENCES
Blueprint for a Clean Bay-Construction-Related Industries: Best Management Practices fOf' Storm Waus Pollution
Prevention; Santa Oara Valley Nonpoint Source PoUul.ion Control Program, 1992.
CA3
11
Construction Handbook 4-8 March, 1"3
ACTIVITY: MATERIAL DELIVERY AND STORAGE Objectives
1----------------------------------,~
·r----~ 'r----,
§h, I/ / , , / II/ / / I / I -dld~
\IIIF=ll\l§\\ll l~ln ll~lll\~ulllr=~ll/§1'
DESCRIPTION
Prevent or reduce the discharge of pollutants to storm water from materiaJ delivery and
stonge by minimizing the storage of hazardous materials on-sit.c, slOcing materials in a
designated arc.a. installing secondary containment. conducting regular inspections, and
tnining employees and subcontraciors.
This best management practice covers only material delivcry and storage. For other
information on materials. sec CA 11 (Mat.crial Use), or CA J 2 (SpiU Pn:venlion and
Control). For information on wast.cs, sec the wast.c management BMPs in this chapter.
APPROACH
The following materials Me commonly stored on cooslnlction sites:
• Soil,
Pesticides and herbicides.
Fertiliurs.
Detergents.
Plaster or other products,
Peuoleum products such as fuel, oil, and grease, and
Other hazardous chemicals such as acids, lime, glues, paints, solvents. and cwing
compounds.
Storage of these materials on-sit.c can pose the following rislcs:
• Storm water poUution,
•
Injury to workers or visitors,
Groundwater pollution, and
Soil contamination .
Therefore, the following steps should be laJcen so minimize your risk:
• Designate areas of the construction site for mat.crial delivery and storage.
• Place near the construction enuan«s, away from waterways
-A void transport near drainage pa.tbs or waterways
-Surround with cart.b bcnns (sec ESC30, Eanb Di.Ice.)
-Place in an area wbicb wiU be paved
Storage of reactive, ignitable, or flammable liquids musl comply wilb lhe rue oodcs or
your area Contact the local Fue Marshal to review site materials, quantilics.. and
proposed storage area to dclennine specific requirements. Sec the Flammable and
Combustible Liquid Code, NFPA30.
For a quick reference on disposal alternatives foe specific wasacs, see Table 4.2, CA40,
E.mploycc/Subcontractor Training.
Keep an aa:urale, up-to-dale inven1ory of materials delivered and s1orcd on-site.
Keep your inventof)' down.
Construction Handoook 4-9
I
Contain Wast,
Minimize Disturbed Ar~as
Subiliu Disturbed Artas
Protsct SJop.s/ChanMls
Control Sit, Peri~t~
Control Internal Erosion
Targeted Pollutants
0 Sedi~nt
0 Nutrients
0 Toxic Materials
0 Oil I. Grease
0 Floatable Materials
0 Other Construction
Waste
• Ubly lo H~v•
Slgnlflc.anl lmpacl
0 P,obabl. Low 0<
Unknown Impact
Implementation
Requirements
0 Capital Costs
0 DI.Al Costs
0 Maintenance
0 Training
0 Suitability for
Slopes >5%
• High 0 I.ow
CA10
-~
Best~ Manage men
Practices
March, 1993
I
11 ACTIVITY: MATERIAL DELIVERY AND STORAGE (Continue)
Minimize baz.ardous materials on-si1e s1ocage.
Handle hazardous materials as infrequenlly as possible.
During the rainy season, consider slOring ma1criaJs in a covered area. Store maicrials in secondary containments
such as an c.anben dilcc, ~ trough; or even a children's wading pool for non-reactiv~ materials sucb as detergents.
oil, grease, and paint.5. Small amounts of mat.erial may be secondarily contained in "bus boy" uays or concre1e
mixing uays.
Do nO( slore chemicals. drums, or bagged mat.erials dircclly on the ground. Place these ii.ems on a pallet and, when
possible, in second3ry contairuncnl.
If drums must be kepi uncovered, s1orc them al a slight angle to reduce ponding of rainwat.er on the lids and IO
reduce corrosion.
Try w keep chemicals in their original cont.liners, and keep them well labeled.
Train employees and subcontnetors.
Employees trained in emergency spill cleanup procedures should be present when dangerous materials or liquid
chemicals are unloaded.
If significant residual mat.erials remain on the uound after construction is complete. properly remove nut.erials and
any contaminatw soil (Sec CA22). Jf the area is to be paved, pave as soon as materials arc removed to sUbiJize lhe
soil.
REQUIREMENTS
• Cost (Capital, O&M)
All or the above are low cos1 measu,es.
• Mainten:l.ncc
. Keep the designated sto1age area clean and well organized.
• Conduct routine weekJy inspections and check for external conosion of material cont.liners.
• Keep an ample supply of spill cleanup materials near lhe storage aica.
LIM IT A Tl ONS
• Stor.age ~eds often must met:t building and fue code requirements.
REFERENCES
Best Management Pr.acticcs and Erosion Conuol Manual foc Construction Siles; Flood Control District or Maricopa
CoWlly, AZ. September 1992.
Blueprint for a Oc.an Bay-Constroction-Rda1.ed Industries: Best Management Practitts for Stonn Water PoUution
Prevention; Sanu Clara Valley Nonpoinl Source Pollution Conuol Program. 1992; Santa Clar.I VaJlcy Nonpoinl Source
Pollution Control Program, 1992.
Coastal Nonpoint Pollution Conlrol Program: Program Development and Approval Guidance. Working Group Wort.in&
Paper; USEPA, April 1992.
Stonn Waier Management foc ConslruCtion Activities; Developing Pollution Prevention Plans and Best Management
Practices, EPA 832-R-92005; USEPA, April 1992.
CA10
Con.slruction Handbook 4. JO · March, 19'3
ACTIVITY: MATERIAL USE
-
DESCRIPTION
Prevent or reduce the discharge or pollutants to st.onn water from material use by using
alternative products, minimizing baz.lrdous ma1eriaJ use on-site, and training employees
and subcontract<>n.
APPROACH
lbe following materials arc commonly used on ronstruction sites:
Pesticides and herbicides.
Fertiliz.ers,
De1ergents,
Plaster and olber products.
Petroleum products such as fuel, oil. and grease, and
Olber hazardous chemicals such as acids, lime, glues, paints, solvents, and curing
rompounds.
Use or lbese ma1erials on-site can pose lbe following risks:
Storm wa1er pollution,
Injury to workers or visit~.
Groundwater pollution, and
• Soil contamination.
lberdore, lbe following stcpS should be taken to mini.ouz.e your risk:
• Use less baz.ardous. alternative matcrials as much as possible.
Minimize use of banrdous ma1erials on-site.
• Use materials only where and when needed IO complete the cooslruCtion activity.
• Follow manufacturcr·s insuuctions regarding uses. proc.oclive e.quipmcnt. ventilation.
flammability, and mixing of chemicals.
• Personnel wbo use pesticides should be lraincd in their use. 1be California Dcpan-
mcnt of Pesticide Regulatioo and county agricultural commissioners lic.ense pesticide
dealers. certify pesticide applicators. and conduct on-site inspections.
• Do no< over-apply fcrtiliz.crs, berbicade.s. and pesticides. Prepare only the amount
needed. Follow lbc recommended usage instructions. Over-application is expensive
and environmentally harmful. Unless on steep slopes. till fertilizers into the soil
ralhcr lban bydroseeding. Apply surface dressings in several smaller applications. as
oppos.cd to one large application. to allow Lime for infiltration and to avoid excess
material being carried off-site by runoff. Do not apply lhcsc chemicals just before it
rains.
Train employ~s and suboontrael.OC'S in proper material use.
Construction Handbook 4. J)
Objectives
Contain Wast•
Minimize Disturbed Alus
5Labiliz• Disturb~ Ar,as
Protect Slopes/ChanMIS
Control Sit, Perimeter
Control Inter~/ Erosion
Targeted Pollutants
0 Sediment
0 Nutrients
0 To,ic Materials
g Oil & Grease
0 Floatable Materials
0 Other Construction
Waste
• UhlyloH•v•
Slgnlneant Imp.ct
0 Probable Low or
Unknown Imp.cl
Implementation
Requirements
0 Capital Costs
0 O&MCosts
0 Maintenanc.e
0 Training
0 Suitability tor
Slopes >5%
• High O Low
CA11
March. 1993
11 ACTIVITY: MATERIAL USE (Continue)
REQUIR.EMF.NTS
• Costs (Capital, O&M)
All of lbe above are low cost measures.
Mainlenancc
Main1enance of lhis bcsl management practice is minimal.
LIMITATIONS
• AJLCmative materials may noc be available. suitable, or crfective in every c.ase.
REFERENCES
Blueprint for a C1ean Bay-ConslrUCtion-RelaLCd Industries: Besc Management Prxtic.cs for Storm Water Pollution
Prevention; Sani.a Cara Valley Nonpoint Source Pollution Control Program. 1992; Sarna Clar.a Valley Nonpoint Source
Pollution Control Program. 1992.
Coastal Nonpoint Pollution Control Program: Program Development and Approval Guidance, Working Group Worlc.ing
Paper, USEP A. April 1992.
S1orm Wa1er Management for Construction Activities; Developing Pollution Prevention Plans and Bes1 Management
Practices, EPA 832-R-92005; USEPA, April 1992.
CA11
Construction Handbook 4 • 12 Marcia, 1993
ACTIVITY: SPILL PREVENTION ANO CONTROL Objectives
J---------------------------------1 ~
GJ rn rn Contain Wast•
DESCRJP11ON
rn
[i]
[:]
Prevent or reduce lhe discharge o( pollutants IO SIOnn Wala from leaks and spills by
reducing the chaDa for spills, stopping the source of spills. ooot.aining and cleaning up
spills, properly disposing of spill auterials, and mining employees.
lhis best management practice coven only spill prevention and cootrol. However, CA JO
(Material Delivery _and Storage) and CAJ J (Material Use). also contain useful informa-
tion, particularly on spill prevention. For informat.ioo on wastes, sec the waste manage-
ment BMPs in this chapter.
APPROACH
lbe following steps will help reduce lbc SIOr1Jl waler impacts of leaks and spills:
Ptfi[)( ·s;rnificanr sam·
Different DULCrials pollute in different amounts. Make sure that each employee
knows what a ·signific.mt spilr is for.each malerial they use, and wbal is the appro-
priate response fo1 ·significant· and ·insignifacant· spills.
Gtner:al Measures
Haurdous materials and wastes should be stored in covere.d coolaincrs and prOleet.ed
from vandalism.
Place a stockpile of spill cleanup materials wbcrc it will be readily accessible.
Train employees in spill preveotioo and cleanup.
• Designate responsible individuals.
Clc;anua
Clean up leaks and spills immcdia&ely.
• On pave.d swfaccs, clean up spills wilh as littJc water as possible. Use a rag for small
spills, a damp mop for general cleanup, and absorocnt material for larga spills. If the
spilled material is tw.dous, tbc:n I.be used clcaoup maccrials are also baz.xdous aod
must be sent IO either a certified lauodry (rags) or disposed oC as hazardous waste.
• Never hose dowu or bury dry malUial spills. Clean up as mucb or lhc mataial as
possible and dispose of properly. Sec lhc waste management BMPs io lb.is chapter for
specific information.
RCJ)Oltior
• Report significant spills to locaJ agencies, such as the Fite Dcpanment; Ibey can assist
in cleanup.
• Fedc:raJ regulations require thal any significant oil spill into a water body or onto an
adjoining shoreline be reponed to lhc National Response Centa (NRC) at 800-424•
8802 (2A hour).
Construction Handbook 4 -13
llinimi.u Disturb4HI ArNs
Stabifin Dislurb4HI AINS
Prol.cl Sl~s/Chann.ls
Control Sit• PM'im,,I.,
Conlrol lnl«nal Erosion
Targeted Pollutants
0 S«li~nt
0 Nutrient•
0 Toxic &lllteri•,.
Q Oil .S Grease
0 Flo11table Auteri.ls
0 Other Corutrvction
Waste
• UblyloH•.,.
Slgnllk»nt lm,,.,c t
0 Prob«>'-L.owor
Unknown Imp.ct
Implementation
Requirements
0 ,Caphal Co.et•
Q o.sueo.,.
0 U.inten•nce
~ T,-ining
0 Suitability lor
Slopu>5"
• High Q Low
CA12
March, )993
I
ACTIVITY: SPILL PREVENTION AND CONTROL (Continue)
Use the following measwes related to specific activities:
Ycbick and EQuiomcm Maintenance
• If maintenance must occur on-site, use a designated area and/or a secondary containmcnl located away from
drainage coun.cs, lO prevent lhe runon or stonn wall!r ~ the runoff of spills.
• Regularly inspect on-site vehicles and equipment for lcalcs. and repair immediately.
• Cbcclc incoming vehicles and equipment (including delivery uuclcs., and employee and subconuactor vehicles) for
lealing oil and nuids. Do not allow leaking vehicks or equipment on-site.
• AJways use secondary containmcOl such as a drain pan or dlop cloth, to caacb spills or leaks when removing or
changing nuids.
• Place drip pans or absorbent materials under paving equipment when not in use.
• Use adsorbent materials on small spills rather than hosing down or burying the spill. Remove lhe adsorbent materi•
als p,ompt.ly and dispose of properly.
• Promptly transfer used fluids 10 the proper waste or recycling drums. Don't leave full drip pans or other open
containers lying around.
• Oil filters disposed or in trash cans or dumpsters can lcalt oil and pollute storm water. Place the oil filter in a funnel
ova a waste oil recycling drum to drain excess oil before disposal. Oil fihers can also be recycled. Ask yow oil
supplier or recycler about recycling oil filters.
• Stoo: cracked baueric.s in a non-leaking scrond.ary container. Do this with all cracked baueries, even if you think alJ
the acid bas drained out. If you dlop a battery, treat ii as if it is cracked. Put it imo the containment area until you
are sure it is noc leaking.
Ychick and EQuiomcnt futlior
• Ir fueling must occur on-site, use designated areas, located away from drainage courses, 10 prevent the runon or
stonn water and the runorr of spills.
• Discourage ~topping-off' of fuel tanks.
• AJways use secondary coouuruncnt. such as a drain pan. when foeling to catch spiUs/lealcs.
REQUIREMENTS
• Costs (Capital, O&M)
-Prevention of leaks and spills is inexpensive. Treatment and/or disposal of contaminated soil or water can be
quite expensive.
• Maintenance
-Keep ample supplies or spill cootrol and cleanup materials on-site, near storage, unloading. and maintenance
areas.
-Updare your spill prevention and rontrol plan and stock cleanup materials as changes occur in lhe types of
chemicals on-site.
LIMITATIONS
If necessary. use a private spill cleanup company.
REFERENCES
Blueprint for a Clean Bay-Construclioo-Relaled Industries: Best Managemcnl Practices for Storm Water Pollution
Prevention; Sant2 a~ Valley Nonpoinl Source Pollution Control Program. 1992; Santa Clar.l Valky Nonpoint Source
Pollution Control Program, 1992.
Storm Wattr Management for Construetioo Activities. Developing Pollution Prevention Plans and Best Managemenr
Practices. EPA 832-R-92005; USEPA. April 1992. •
CA12
Construct.ion Handbook 4 .J4 March, 1993
ACTIVITY: SOLID WASTE MANAGEMENT
Graphic: North Central Texas COG. 1993
DESCRIPTION
Prevenl or reduce the discharge of pollutants to SIOrol waler from solid or consuuction
waste by providing designa1ed was1e collection areas and containers, amnging for regular
disposal, and training employees and subcontraccors.
APPROACH
Solid waste is one of the major pollutants resulting from construction. Construction debris
includes:
Solid wasle generated from uees and shrubs removed during land clearing, demolition
of c:usting strucrures (rubble), and building construction;
Packaging materials including wood. paper and plastic;
Scrap or surplus building ma1erials including scrap metals, rubber, plastic, glass
pieces. and masonry products; and
Domestic wast.es including food containers such as beverage cans. coffee cups. paper
bags. and plastic wrappers, and cigarcues.
The following steps will help lcecp a clean si1e and reduce s&orm waler poUution:
Selec1 designated waste collection areas on-site.
lnfonn trash hauling conuaccors lbaJ you will acccp< only water-tigb1 dumpsters for
on-site use. Inspect dumpsters for leaks and repair any dumpster Iha.I is not water
tighL
Locate concainers in a covered area and/or in a secondary coot.ainmenL
Provide an adequate number oC containers wilh lids or covers Iha.I can be placed over
lbc conlainer IO keep rain ou1 or to prevent loss of wast.es when it's windy.
Plan for additional con~rs and more frequent pickup during the demolition phase
of construction.
Collect site trash daily, especially during rainy and windy conditions.
Erosion and sediment concrol devices tend to coUoct lit&er. Remove this solid waste
promptly.
Make sure that toxic liquid wastes (used oils, solvents., and paints) and chemicals
(acids. pesticides, additives, curing compounds) are not disposed or in dumpsters
designated for construction debris.
• Salvage or recycle any useful mataia.l. For ex.ample, trees and shrubs from land
clearing can be used as a brush barrier (sec ESC53). or convened in10 wood chips,
lbcn used as mulch on graded areas (sec ESCI I).
Do not hose ou1 dumpsters on lhe construetion site. Leave dumps1er cleaning to trash
hauling contractor.
Arrange f0< regular was1e coUcction before cootainers overflow.
Construction Handbook 4 • IS
Objectives
Housekteping Prac6ces
~
Minimize DisturNd Areas
Sbbiliz• Disturbed Areas
Protect Slopes/ClunMls
Control Sil• Perimeter
Control lnltrnal Erosion
Targeted Pollutants
0 Sediment
0 Nutrients
0 Toxic M•terials
0 Oil & Grease • Floatable Materials • Other Construction
Waste
• Ulc•ly lo Hav•
Significant Impact
0 Probabl• Low or
Unknown Impact
Implementation
Requirements
0 Capital Costs
0 O&M Costs
0 Maintenance
~ Training
0 Suitability for
Slopes >5"
• High O Low
CA20
March, 1993
ll
ACTIVITY: SOLID WASTE MANAGEMENT (Continue)
If a container does spill, clean up immediately.
Make sure tba1 construction waste is collected, removed, and disposed of only at authorized dispos.al areas.
Train employees and subconu-actors in proper solid waste management.
For a quiclc reference on disposal alternatives for specific wastes, see Table 4.2, CA40, EmployedSubcontractor
Training.
REQUIREMENTS
• Costs (Capital, O&M)
AJI or lbe above arc low cou measwes.
• Main1cnance
-Collccl site trash daily.
-Jnspec1 conwucuon waste area regularly.
-Arrange for regular waste collection.
LIMITATIONS
• Tbere are no major limitations 10 this best management practice.
REFERENCES
Best Management Pr.lctia:s and Erosion Control Manual for Construction Sites; Flood Control District or Maricopa
County, AZ. Sepumbcr 1992.
Processes, Procedures, and Mel.bods to Control Pollution Resulting from all Construction Activity; USEPA. 43°'9-73-
007, 1973.
S1orm Water Management for Construetion Activities, Developing Pollution Prevention Plans and Best Management
Practices, EPA 832-R-92005; USEPA, April 1992.
CA20
Construction Handbook 4 -)6 March, 1993
ACTIVITY: HAZARDOUS WASTE MANAGEMENT
Graphic North Cencral Ten~ COG, 1993
DESCRIPTION
Prevent or redua the discharge or poUutants ID storm water from baurdous wast.c lhrough
proper material use. wast.c disposal. and Ir.lining or employees and subcontn1e10n.
APPROACH
Many or the cbcm.icals used on-site can be hazardous materials which become hazardous
wast.c upon disposal. These wast.cs may include:
PainlS and solvenlS:
Petroleum products such as oils, fuels. and grease:
Herbicides and pesticides:
Acids for cleaning masonry; and
Concret.c curing compounds.
Objectives
Househeping Pr~clic,s
~
Minimiz, Disluf'Nd Are.as
Stabilize Disturbed Ar,.as
Protect Slopes/ChaMtb
Control Sit• P•ri~tM
Control lnttrnal Erosion
Targeted Pollutants
0 S«Ji~nt
0 Nutrients
0 To.ric M•teriels
0 Oil & Grease
0 Float/Ible M•teri•ls
0 Other Constn,ction
W•ste
• UhlyloHan
Slgnlnunt Impact
0 Probabl• Low or
Unknown Impact
In addition. sit.cs with existing structures may contain wast.cs which must be disposed of in t-----
accocdance wilh Federal. State, and local regulations. 1bcse wast.cS include:
Sandblasting grit mixed wilb lead-. cadmium-. or chromium-based paints:
AsbeSIOS; and
PCBs (particularly in older iransformers).
Tbc following steps will help reduce storm water pollution from b.az.ardous wastes:
Material Use
Use all of lhc product before disposing or tbc contaiocr.
Do not remove tbc original product label, it oonuins important safety and disposal
inf onnation.
Do not over-apply babicides and pesticides. Prepare only tbc amount nccdcd.
Follow tbc recommended usage instructions. Over-application is expensive and
environment.ally bannful. Apply swfacc dressings in sever.I smaller applications, as
opposed 10 one large application, to allow lime for infiltration and 10 avoid excess
OlaLCrial being carried off-site by runoff. Do not apply lhese chemicals just be(orc it
rains. People applying pesticides must be certified in accordantt with Federal and
Sw.e regulations.
Do not clean out brushes or rinse paint ronlainers into tbc dist. street, guncr, storm
drain. or stream. ·Paint out· brushes as much as possible. Rinse wa1er-bascd paints
10 the sanitary sewer. Falt.er and re-use thinners and solvents. Dispose of excess oil·
based paints and sludge as baz.ardous wast.c.
Consrruclion Handbook 4 • 17
lmplemen~lion
Requirements
0 C•pit•I Costs
0 O1.M Cost,
0 M•intenance
g Training
0 Suitability for
Slopes >5"
• High Q Low
CA21
March. 1993
11
I
ACTIVITY: HAZARDOUS WASTE MANAGEMENT (Continue)
-------------------------------------t
Waste Rccvclio0 1DisposaJ
• Sekel designa1.ed baz.ardous waste collection areas on-site.
• Hazatdous materials and wastes should be stored in covered containers and procect.ed from vandalism.
Place hazardous waste containers in secondary containmenL
Do not mix wastes, lhis can cause chemical reactions. maJce recycling impossible, and complica1e dispos.al.
Recycle any useful material sucb as used oil or water-based paint.
Make sure t.bac toxic liquid wastes (used oils, solvents. and paint.s) and chemicals (acids, pesticides. additives, curing
compounds) are not disposed of in dumpsters designa1.ed for consuucuon debris.
Arrange for regular waste collection before containers ov~rflow.
MaJce sure lbal baz.ardous waste (e.g. excess oil-based paint and sludges) is coUected, removed, and disposed of only
at authorized dispos.al areas.
For a quick reference on dispos.al al1.ematives for specific wastes, see Table 4.2. CA40. Employee/Subcontractor
Training.
Jraioior
• Train employees and subcontractors in proper baz.ardous waste management.
• Warning signs should be placed in areas recently lfeated with chemicals.
• Place a stockpile of spill cleanup mat.erials wbere it will be readily accessible.
• If a container docs spill, clean up immediately.
REQUIREMENTS
• CoslS (Capital, O&M)
All of tbe above arc low cost measures.
• Maintenance
-Inspect hazardous waste receptacles and area regularly.
-Arrange for regular ba?Mdous waste collection.
LIMITATIONS .
Hazardous waste that cannot be reused or recycled must be disposed of by a licensed hallrdous waste hauler.
REFERENCES
Blueprint for a Clean Bay-Construction-Related Industries: Best Management Practices for Storm Water PoUution
Prevention; Santa Oara Valley Nonpoint Source PoUution Control Program. 1992.
Processes. Procedures, and Methods to Control Pollution Resullint from all Construction Activity; USEPA. 430J9-73-
007, 1973.
Storm Water Management for Consuuction Activities. Developing Pollution Prevention Plans and Best Management
Practi~. EPA 832-R-92005; USEPA, April 1992.
CA21
ConstTuclion Handbook 4 -18 March, )993
ACTIVITY: CONTAMINATED SOIL MANAGEMENT
DESCRIPTION
Prevent or reduce Lbe discharge of pollutants to storm water from contaminated soil and
highly acidic or albline soils by conducting pre-construction surveys, inspecting excava-
tions regularly, and remediating contaminated soil promptJy.
APPROACH
Coot.aminated soils may occur on your si1.e for several reasons including:
Past si1e uses and activities;
Detected or undetected spills and leaks; and
Acid or alxaline solutions frOOl exposed soil or rock formal.ions high in acid or
alkaline-(0'1Tling elements.
Most developers conduct pre<onstruclion environmental assessments as a ~It.er of
routine. Recent coun rulings holding contrac1oc liable for cleanup coSts when lhcy
unknowingly move contaminated soil, highlight lhe need for conuactors to confirm that a
site asscssmcni is completed~ earth moving begins. ·
lbe following st.eps will help reduce storm waler pollution from contaminated soil:
Conduct I.borough site planning including pre-conslrucl.ioo geologic surveys.
Loolc for contaminated soil as evidenced by discoloration, odors. differences in soil
properties, abandoned underground tanks or pipes.. or buried debris.
Prevent lcak.s and spills IO Lbc maximum extent practicable. Contaminated soil can be
expensive to trcat and/or dispose of properly. However, addressing Lbc problem
before construction is much less expensive than after Lbc structures are in place.
Tes.t suspected soils at a certified laboratory.
• Jf Lbc soil is contaminated, wort wilb Lbe k>cal regulatory agencies to develop options
for tRatrnent and/or disposal.
For a quick reference on disposal alternatives for specific wastes, sec Table 4.2.
CA40, Employee/Subcontractor Training.
REQUIREMF.NTS
Objectives
Housekeeping Practices
~
Protect Slopes/Channels
Control Site Perimeter
Control Internal Erosion
Targeted Pollutants
~ Sediment
0 Nutrients • Toxic Materials
0 Oil & Grease
0 Floatable Materials
0 Other Construction
Waste
• UhlytoH•v•
S/9f'inc.ant lmpM:t
0 Probabl• Low or
Unknown Imp.ct
Implementation
Requirements
0 Capital Costs
Q O&MCosts
0 Maintenance
Q Training
0 Suhabi/ity for
Slopes >5%
• High 0 Low
• Cosu (Capital, O&M) C A22
Prevention of lcal:..s and spills is inexpensive. Trcaunen1 and/or disposal of
conuminated soil can be quite expensive.
Maintenance
Inspect excavated areas daily for signs of contaminated soil.
Implement CA 12, Spill Prevention and Conuol, to prevent leaks and spills as
much as possible.
Construction Handl>ook 4 -19 March, 1993
11
I
ACTIVITY: CONTAMINATED SOIL MANAGEMENT (Continue)
LThHTATI0NS
• Cootaminal.Cd soils that cannot be treated on-si1e must be disposed or off-si1.e by a licensed hazardous waste baukr.
• Toe prescoce or conwrunated soil may indica1e contaminated water as well. See CAI (Dcwa1ering ~rations) in
lhis chapter for more information.
REFERENCES
Blueprinl for a Ckan Bay-Construction-Related Industries: Best Management Practices for Stonn Water Pollution
Prevention; Santa Oara Valley Nonpoinl Source Pollution Conuol Program. I 992.
Processes. Procedures. and Methods to Control Pollution Resulting from all Construction Activity; USEPA, 430/9-73-
007, 1973.
S1onn Water Management for ConslruCtion Activities. Developing Pollution Prevention Plans and Best Management
Practices. EPA 832-R-92005; USEPA, April 1992.
CA22
Construction Handbook 4 -20 Marcia, 199)
ACTIVITY: CONCRETE WASTE MANAGEMENT
DESCRIPTION
Prevent or reduce tbc discharge of pollutants ID slOrO'I water from concrete waste by
conducting was.bout off-site. petforoung on-site washout in a designated area, and lraining
employtts and subcontraclOrs.
APPROACH
Toe following s1.eps will help reduce storm water pollution from concrete wastes:
StOf'C dry and wet materials under c.over, away from drainage areas.
Avoid milling excess amounts or fresh concrete or cement on-site.
Perform wasbool or concrete uud.s off site or in designal.ed areas only.
• Do not wash out c.oncrel.e truck.s into stonn drains. open ditches, sttects, or streams.
• Do not allow excess concrete IO be dumped on-site, except in dcsigna1.ed a,eas.
For on-site washout
locate washout area at least 50 feet from storm drains. open di&cbes. or water
bodies. Do not allow runoff from this area by constructing a temporary pit or
bermed area large enough for liquid and solid waste;
wash out wasl.es into tbc semporary pit where the concrete can set. be broken up,
and then disposed or properly.
When washing concrete IO remove fine particles and exp05c the aggregate, avoid
creating runoff by draining the water IO a bcrmed or level aru.
Do no( wash sweepings from expo6Cd aggregate c:onaete in10 the street or storm
drain. Collect and return sweepings to aggregate base stock pile, or dispose in the
tras.b.
• Train employees and subc:ontixtors in proper concrete was1.e management.
For a quick reference on disposal altemalives foe specific wastes, see Table 4.2,
CA40, Employce/Subconuactor Training.
REQUIR.EMF.NTS
• Costs (Capital, O&M)
AJI oC lbc above are low cost measwes.
• Maint.enance
Inspect subcontractors to ensure that cooacte wast.es are being properly man•
aged.
U using a temporary pit, dispose hardened concrete oo a regular basis.
LTh1ITATIONS
• OU-sit.c wasboot or concrete wastes may not always be po~ible.
Con.struclion Handbook 4 -2)
Objectives
Housekeeping Practices
~
Minimize Disturbed Areas
Stabifilt Disturbed Areas
Protect Slopes/Channels
Control Sil• Perimeter
Control lnttrnal Erosion
Targeted Pollutants
0 Sediment
0 Nutrients
0 To,cic M•terials
0 Oil & Grease
0 Floatable Materials
0 Other Construction
Waste
• UkelytoHa>'e
Slgnlncant lmpect
0 Probabl. Low or
UnJcnown lmpac:I
Implementation
Requirements
0 Capital Costs
0 O&MCosts
0 M•intenance
~ Training
0 Suitability tor
Slopes>S%
• High O Low
CA23
March, 1993
I I
11
ACTIVITY: CONCRETE WASTE MANAGEMENT (Continue)
_ ..£FERENCES
Be.st Management Practices and Erosion Control Manual for Consuuction Sites; Flood Conuol Dislric1 of Maricopa
County, AZ. July 1992.
Blueprinl for a Clean Bay-Consuuclion-Rela~d Jnduslries: Best Management Praclic.cs foe.Storm Water Pollution
Prevention; Sania Oara Valley Nonpoinl Source Pollution Conllol Program, 1992.
S1onra Water Management for ConslJUCtion Aclivilies. Developint Pollution Prevention Plans and Best Management
Practices, EPA 832-R-92005; USEPA, April 1992.
CA23
Construction Handbook 4 -22 March, 1993
ACTIVITY: SANITARY/SEPTIC WASTE MANAGEMENT
DESCRJPTION
Prevent or reduce the discharge or pollu<ants IO stonn water from sanitary/septic waste by
providing convenienL well-maintained facililies, and arranging for regular scnr,cc and
disposal.
APPROACH
Sanitary or septic wast.es should be 11c:a1ed 0< disposed of in accordance with St.ate and
local requirements. These requirements may include:
Loca1e s.anit.ary facilities in a convc:nic:nl location.
Untreated raw wastewater should never be discharged or buried.
Temporary septic systems should 11ea1 wastes 10 appropriate levels before discharging .
If using an on-site disposal syst.em (OSDS). sucb as a septic system, comply with local
beahh agency requirements.
Temporary s.anit.ary facilities that discharge lO the sanitary sewer system should be
properly connected lO avoid illicit discharges.
Jr discharging 10 the sanitary sewer, contact the local wastewater ueatment plant for
their requirements.
Sanitary/septic facilities should be maintained in good working order by a licensed
service.
Arrange for regular waste collection by a licensed baukr before facilities overflow.
For a quid: reference on disposal alternatives for specific wastes, see Table 4.2,
CA40, Employee/Subcontractor Training.
REQUCREMF.NTS
• Costs (Capital, O&M)
All o( lbe above are low cost measures.
Maintenance
Inspect facilities regularly.
Arrange for regular waste collection.
LIM IT A TI ONS
There: are no major limitations 10 this best management practice.
REFERENCES
Best Management Practices and Erosion Control Manual for Construction Sites; Flood
Con11ol District of Maricopa County. AZ, September 1992.
Storm Water Management for Construction Activities, Developing PoUution Prevention
Plans and Best M~~gemcnt Practices. EPA 832-R-92005; USEPA, April 1992.
Construction Handbook 4 • 23
Objectives
Housekeeping Practices
~
Minimize Disturbed Areas
Stabilize Disturbed Areas
Protect Slopes/Channels
Control Site Perimeter
Control Internal Erosion
Targeted Pollutants
0 Sediment
0 Nutrients
0 Toxic Materials
0 Oii & Grease
0 Floatable Materials
0 Other Construction
Waste
• Ul<•ly to Hav•
Sl9nir1CJ1nt lmp~t
0 Probabl• low or
Unknown Impact
Implementation
Requirements
0 qapital Costs
0 O&MCosts
0 Maintenance
0 Training
0 Suitability tor
Slopes>5%
• High O Low
CA24
Marcil, 1993
ACTIVITY: VEHICLE AND EQUIPMENT CLEANING Objectives
----------------------------------1 =
Graphic: Noni'> CentralTeus COG, 1993 ~
Contain Wast,
DESCRIPTION
Prevent or reduce lhc discharge of pollutants IO storm waia from vehicle and equipment
clc3Jling by using off-siie facilities, washing in designated, oontaincd areas only, eliminat-
ing discharges 10 lhc storm drain by inftJtnting or recycling the w.ub water, and/or
training empk>yees and subcontraclOr'S.
APPROACH
Use off-siLC oommerciaJ washing businesses as much as possible. Washing vehicles
and equipment outd~ or in ~ where wash water nows onto paved surfaces or
into drainage pathways c.an pollute storm wa1a. If you wash a large number of
vehicles or piec.es of equipment. consider conducting lbis wort al ao off-site commer-
cial business. lbese businesses arc better equipped to handle and dispose of the wash
waters propaly. Performing lhis work off-site can also be ecooomical by eliminating
the need for a separate washing operation at your site.
Jr washing must occur on-site, use designated. bermcd wash arc.as to prevent wasb
waler contact with storm waler, aeclcs, rivers, and ot.bcr waler bodies. The wash area
can be sloped for wash water collection and subsequent infiltration into lbe ground.
Use as little water as possible 10 avoid having to inst.all aosion and sediment controls
for t.bc wash arc.a.
Use phospba1c-rree. biodegradable soaps.
Educa1e employees and subcontract~ on pollution prevention mcasur-es.
Do DOC pennit st.cam cleaning on-site. Steam cleaning~ genc:raLe sigoificanl
pollutant eoottntrations.
For a quick reference on disposal altemalives for specific wastes, see Table 4.2.
CA40, Employee/Subcontractor Training.
REQUIREMF.NTS
Costs (Capital. O&.M)
AJI o( the above arc low cost measures.
Maintenaocc.
Minimal, some berm repair may be nec.essary.
L™ITATIONS
Even phosphate-me, biodegradable soaps have been ~W1l to be toxic IO fish before
lbc soap degrades.
Sending vchiclcs/equipmcn1 off-site s.bould be done in ronjunctioo with ESC24
(S1.abiliz.ed Construct.ioo EnlraJlCC).
REFERENCE
Swisher, RD .• 1987. Swfactant Biodcgradation, Marcel Dcckc:r Corporation
Construction Handbook 4 ~ 24.
Uinimiz• Disturb«/ Ar.as
Stabilin Disturb«/ ArN.s
Targeted Pollutants
0 Sedi~nt
0 Nutrient•
0 ·roxic u-,eriau
~ Oil& Grease
0 Floatable Materials
0 Othe-r Con.strvction
Waste
• UblyloH..-•
Slgnlncant Imp.ct
0 Prob.bi. Low or
un•nown Impact
Implementation
Requirements
0 Capit!'I Costa
0 O&UCosta
0 Maintenance
0 Training
0 Suitability #or
Slopu>S"
• High O Low
CA30
March, )993
ACTIVITY: VEHICLE ANO EQUIPMENT FUELING Objectives
1-----------------------------------;~
:~ . .-.. :-=-;;.~ .. :=-: .-::~~ ;~~.:~:·.·:;
i2tl~SJi/J
DESCRIYTION
Prevent fuel spills and lcaJcs, and reduce their impacts to storm walef by using oCf-si&e
facilities. fueling in designat.ed areas only, enclosing or covering stored fuel, implementing
spiU coo11ols, and training employees and subcontractors.
APPROACH
Use off-site fueling stations as much as possible. Fueling vehicles and equipment
out.doors or in areas where foci may spill/leak onto paved surfaces or into drainage
pathways can poUut.e stonn water. If you fuel a large number of vehicles or pieces of
equipment. consider using an off-site fueling station. These businesses arc benu
equipped 10 handle fuel and spills properly. Performing this work off-site can also be
econoa,ical by eliminating the need for a separate fueling area al your site.
If fueling must occur on-site, use designated areas. locat.ed away from drainage
courses. to pcevent lbe runon of storm water and the runoff of spills.
Discourage ~topping-off' of fuel tanks.
Always use secondary containment. such as a drain pan or dtop cloth, when fueling 10
catch spills/leaks.
Place a stoekpile of spill cleanup mat.erials where it will be readily accessible.
Use adsorbent mat.erials on small spills rather than hosing down or burying the spill.
Remove the adsorbent materials promptJy and dispose of properly.
Carry out all Federal and State requiremenlS regarding stationary above ground storage
t.aru:S.
• Avoid mobile focling of mobile construction equipment around the si&e; rather,
transport the equipment 10 dcsignaied fueling areas. With lbe exception or craclccd
equipment such as bulldozers and perhaps fort.Juts, most vehicles should be able to
travel 10 a designated area with little lost time.
Train employees and subcontractof"S in proper Cucling and cleanup prooedures.
For a quick reference on disposal ah.emativcs for specific wastes, see Table 4.2, CA40,
Employcc/Subcootractor Training.
REQUIREMENTS
Costs (Capital, O&M)
All of the above measures are low cost. except for the capital costs or above
ground tanks that meet aU local environmental, zoning. and fire codes.
Maintenance
Keep ample supplies of spill cleanup materials on-sit.e.
Inspect fueling areas and storage tanks on a regular schedule.
LIM IT A Tl ONS
• Sending vehicles/equipment ofC-siLC should be done in conjunction with ESC24
Stabiliz.cd Construction Eotranee ).
Construction Haodl>ook 4 • 25
Contain Wasl•
Minimir• Dislvrbed Arus
Subilir, Disturbed Artas
Prol&el Slopes/Channels
Conlrol Sile Perimeler
Conlrol lntunal Erosion
Targeted Pollutants
0 Sedi~nt
0 Nutrients
0 Toxic &flllerials
~ Oil & Grease
0 FJostable Materials
0 Other Construction
Wsstt'
• Uk~ly to Hav•
Slgnific.anl Imp.ct
0 Probabl• low or
Unknown Impact
Implementation
Requirements
0 Capital Costs
0 O&MCosts
0 Maintenance
~ Training
0 Suitability for
Slopes >5%
• High Q Low
CA31
March, 1993
ACTIVITY: VEHICLE AHO EQUIPMENT MAINTENANCE Objectives
L----------------------------------1~
Graphic: Nonh Ceneral Texas COG. 1993 ~
DESCRIPTION
Prevent or reduce lbe discharge of pollutants lO storm wata from vehicle and equipment
maintenance by ruoning a Mdr'y site". lrus involves usiog off-site facilities. paforming
wort in designaud areas only, providing cover for materials stored outside, checking for
leaks and spills, containing and ckaning up spills immediately, and training employees and
subcontractors.
APPROACH
Keep vehicles and cq:.1ipmen1 clean, don'I allow excessive build-up of oil and grease.
Use off-sit.c repair shops as much as possible. Maintaining vehicles and equipment
outdoors or in areas where vehicle or eqwpmenl fluids may spiU or leak 0010 the
ground can pollute storm waler. If you maintain a large number of vehicles or piec.cs
of equipmenl, consider using an 0Cf-si1e repair sbop. These businesses are better
equipped to handle vehicle fluids and spills properly. Perfonning lbis work off-sit.c
c:in also be economical by eliminating the need for a separare maintenance area.
If maintenance must occur on-site, use dcsignaJcd areas, loca1od away Crom drainage
c~s. to prevent the ruoon of storm waler and the ruooff of spills.
Always use secondary conlainmcnl, such as a dram pan or drop cloth. to cal.Cb spills or
leaJc.s when removing or changing Owds.
Place a stockpile of spill cleanup materials where it will be readily accessible.
Use adsorbent materials on small spills rather than hosing down or burying the spill.
Remove the adsorbent materials promplly and dispose of properly.
Regulaily inspect on-site vehicles and equipment for leaks, aod repair immodiaLCly.
Cbeck incoming vehicles and equipment (including delivery lrUd.s, and employee and
subcontrac:1or vehicles) for leaking oil and fluids. Do oot allow leaking vehicles or
equipcneot on-site.
Segregate and recycle wastes, such as greases, used oil or oil flit.en. antiCrcezc.
cleaning solutions., automotive bancrics., hydraulic. and transmission fluids.
Train employees and subcontracton in proper maint.coance and spiU cleanup procc-
dwcs.
For a quick rdereocc oo disposal alternatives for specific wastes, su Tabk 4.2, CA40,
Employee/Subcontractor Training.
REQUIREMENTS
• Costs (Capital, O&M)
All of the above arc low cost measures.
Maintcn.ance
Keep ample supplies of spill cleanup materials on-site.
Inspect mainte~cc areas on a regular schedule.
Construction Handbook 4 -26
Contain Wast•
lfinimin Disturb«J Arus
Subiliz• Disturb«J Arns
Prof.cl Slop6s/Chann•ls
Control Sit• P•rimet.,
Conlrol lnt,maf Erosion
Targeted Pollutants
0 Sedi~nt
0 Nutrient•
0 Toxic lfllferi•b
g Oil & Grease
0 Floatable Materials
0 Other Con.,trvction
wa.,te
• Uhty lo H,v•
S/gnlttc..nt Imp.ct
0 Probab,. Low o,
Unknown Impact
Implementation
Requirements
0 C•pit•I CNt.s
0 O&M Co$ls
0 Mllinten•nce
g T,..ining
0 Suit•bility lot
Slopes >5"
• High O Low
CA32
March, 1993
ACTIVITY: VEHICLE AND EQUIPMENT _MAINTENANCE (Continue)
U:MITATIONS
• Sending vehicles/equipment off-sitc should be done in.conjunction wilh ESC24 (Subilized Consll\ln.ioo Entrancd.
Outdoor vehicle or equipment maintcnance is a potent.i..'.llly significant source of storm water pollution. Activities th3t
can conuminat.c storm water include engine repair and service, particulaily changing or replxement of 0uids. and
out.door equipment storage and p3rk.ing (dripping engines). For funber infonnation on vehicle or equipment ~rvicing.
see CA30, Vehicle and Equipment Cle3Sling. and CA31, Vehicle and Equipment Fu~ling.
Listed below is funber information if you must perform vehicle or equipment maintenance on-site.
l\'.aste Rcduoion
Paro arc often clc30ed using solvents such as tricbloroelbylcnc, 1,1.1-tricbloroctbane, or methylene chloride. Many o(
lbcse pans cleaners arc hannful and must be disposed of as a hazardous waste. Reducing lhc number of solvents makes
recycling easier and reduces baz:ardous waste management costs. Ohen, one solvent can perform a job as well as two
different solvents. Also, if possible, eliminate or reduce lbc amount of hazardous materials and waste by substituting
non-hazardous or less haz.ardous materials. For example, replace chlorinatcd organic solvents ( 1, 1, 1-trichloroclhane,
methylene chloride, etc.) with non-chlorinated solvents. Non-chlorinated solvents like kerosene· or mineral spirits are
Jc.ss toxic and less expensive to dispose of properly. Checlc list of active ingredients to see whether it conuins cblori-
n3tcd solvents. The ~cblor" term indicates l.bal lbc solvent is chlorinated. Also, try substituting a wire brush for solvents
to clean pans.
RccvcJin°/DisoosaJ
Scpanting wastes allows for easier recycling and may reduce d.isposal costs. Keep baz.ardous and non-hazardous wastes
~para.Le, do not m.ix used oil and solvents, and keep chlorinated solvents (like 1.1,1-lrichloroclhane) separate &001 non-
chlorinated solvents (W;e lceros.cne and m.ineral spirits). Promplly transfer used fluids to the proper waste or n:cycung
drums. Don'1 leave full drip pans or olhcr open containers lying around.
Oil fLltcrs disposed of in trash cans or dumpsters can leak oil and cont.am.irut.c storm water. Pl.ace lbe oil filter in a funnel
over a waste oil recycling drum to drain excess oil before disposal. Oil filters can also be recycled. Aslc your oil
supplier or recycler about recycling oil fa hers.
Do not dispose of extra paints and coatings by dumping liquid onto the ground or throwing it into dumpsters. Allow
coatings to dry or harden before disposal into covered dumpsters.
Store cracked batteries in a non-leaking ~c.ondary conu.i.ner. Do this with all cracked baturics, even if you lhink all lbc
acid bas drained ouL If you drop a baa.cry, trcat it as if it is cracked. Put it into lbc containment area until you aie sure it
is not lc.aking.
Do not bury used tires.
REFERENCF.S
Best Management Practices and Erosion Control Manual for Construct.ion Sites; Flood Control District of Maricopa
County, AZ. September 1992.
Blueprint for a Clean Bay-Construction-Related Industries: Best Management Practices for S1onn Water PoUut.ion
Prevent.ion; Sant.a Cara Valley Nonpoint Source Pollution Conllol Program, 1992.
Coastal Nonpoint Pollution Control Program: Program Development and Approval Guidance, Wooong
Group Working Paper, USEPA, April 1992. CA32
Construction Handbook 4 -27 March, 1993
ACTIVITY: EMPLOYEE/SUBCONTRACTOR TRAINING
DESCRIPTION
Objectives
Contain Wast,
Minimirt Disturn.d Aleas
St.Jbili:r, Disturn.d ArHs
Prol9Ct SJopes/Chann,ls
Control Sitt P,rimet,r
Control lnt,mal Erosion
Employee/subcontractor Ir.lining. like maintenance or a piece of equipmenL is l"IO( ~ much a best management pracuce as
it is a mclbod by wbicb to implement BMPs. This facl sbcct bigbligblS the imporuncc of tninin~ and of iniegraung lbe
clements of cmploycc/subcontncl.Or training from the individual !,OW"CC controls into a comprc:bc:nsivc trainmg program
as pan ofa company's Storm Wa1er Pollution Prevention Plan (SWPPP). ·
1be specific employc:dsubcom:nctor training aspects or c.acb of lbc ~urce conuols arc bigbligbted in lbc individual fact
sheets. Tbe focus or this fact sbc:c:t is more general, and includes lbe overall objectives and approach for assuring
employedsubconuactor Ir.lining in storm waler pollution prevention. Accordingly, lbe organization of I.bis fact sheet
differ.. somewhat from lbc: olber fact sheets in lbis cbaptu.
OBJECTIV£S
Employoc/subcontracior training should be based on four objectives:
Promote a clear identification and understanding of lbe problem, including activitic:s with I.be: potential to pollute
storm water.
Identify solutions (BMPs);
Promote employedsubconlloCtor owner..bip of lbc: problems and lbc: solutions; and
Integrate employec/subconlloCtor feedback into training and BMP implementation.
APPROACH
lnicgratc training regarding SIOrU'I water quality management with existing training programs lbat may be rcqumd for
your business by od>er regulations such as: lbc IUncss and lnjw-y Prevention Program OIPP) (SB 198) (California
Code of Regulations Tille 8. Section 3203), the Haz.ardous Waste Operations and Emergency Response
(HAZWOPER) standard (29 CFR 1910.120). the Spill Prevention Conuol and Countermeasure (SPCC) Plan (40
CFR 112), and the Hazardous Materials Management Plan (Business Plan) (California Heahl> and Safety Code.
Section 6.95).
Businesses. particubrly smaller ones that may nOI be regulated by Federal, Stale, or local regulations. may use lhc
information in this Handbook to develop a training program 10 reduce lbc:ir potential to pollute slOflJI water.
Use the quick rdacncc on disposal alternatives (Table 4.2) 10 train cmployc:c:/subcoou-acton in proper and consistc:nl
methods for disposal.
CA40
Construction Handbook 4 · 28 March, 1993
ACTIVITY: EMPLOYEE/SUBCONTRACTOR TRAINING (Continue)
~onsider posting the quick reference &able around the job site oc in the on-site olfice lrailcr 10 reinforce 11aining.
Train employee/subcontractors in standafd operating procedures and spill cleanup techniques described in lhe fact
sheets. Employee/subcon&Detors uaincd in spill containment and cleanup should be present during the loading/
unloading and handling o( materials.
Personnel who use pesticides sbouJd be trained in their use. The California Dcpanment of Pesticide Regulation and
county agricultural commissioners license pesticide dealen. certify pesticide applica1ors, and conduct on-site
inspections.
Proper education or off-site conlt3Ctors is oC1en overlooked. The conscientious efforts of well trained employee/
subcomractors can be lost by unknowing off-si1c cootrac1ors. so malce sure they arc well infonned abou1 wh:u they
an: expected to do on-site.
CA40
Construction Handbook 4 -2? March, 1993
TABLE 4.2 QUICK REFEr :E · DISPOSAL ALTERNATIVES
(Adopted from Santa Clara County Nonpoint ::,ource Pollution Control Program • December 1992)
(')
~ All of lhc wa.st.c products on this chart are prohibited from disch.irge 10 lhe s1onn drain system. Use lhis matrix 10 decide which alternative disposal str:11egies to use.
; ALTERNATIVES ARE LISTED IN PRIORITY ORDER.
"' g Key:
s=
&. g!
'11:'
HHW Household hazardous waste (Government-sponsored drop-off events)
PO1W Publically Owned Treatment Planl
Reg.Bd. Regional Water Quality Control Board (Oakland)
"Dispose 10 sanitary sewer" means dispose into sink. toilet, or sanirary sewer clean-out connection.
"Dispose as Liash" means dispose in dumpsters or trash containers for pickup :ind/or eventual disposal in lanc.Jfill.
"Dispose as haiardous waste" for business/commercial means con1rac1 wirh a hazardous waste hauler 10 remove :inc.I dispose.
DISCHARGF/ACTIVITY UUSINESS/COMMERCIAL RESIDENTIAL
Disposal Priorities Approval Disposal Priorities
General Construction 11nd Palntln~: Stred and Utility Maintenance
Excess p.1in1 (oil-based) I. Recycle/reuse.
2. Dispose as hail\J'd0US waste.
I. Recycle/reuse.
2. Take 10 H HW drop-off.
~
l.,J
C
Excess paint (water-based) 1. Recycle/reuse.
2. Dry residue in Cc\ns, dispose a.s 1rnsh.
3. 1f volume is 100 much to dry ,
I. Recycle/reuse.
2. Dry residue in cans. dispose as trash.
3. IC volume is 100 much to dry. 1.u:c 10
':;,, -" .,
"' ':r' -'C "° c,,,
Paint cleanup (oil-based)
Paint cleanup (water-based)
Empty paint cans (dry)
Pa.int striooing (with solvent)
Building exterior cleaning (high•
pressure water)
Cleaning of building exteriors which
have HAZARDOUS MATERIALS (e.g.
mercury. lead) in paints
disr,ose as hazardous waste. H HW drop-off
Wipe paint oul of brushes, U1cn: Wipe paint ou1 o( brushes, then:
I. Filter & reuse thinners, solve111s. I. Filler & reuse U1i1111ers. sol ve111s.
2. Dispose as h:tZardous waste. 2. Take 10 HHW drop-Off.
Wipe paint out of brushes, ll1en: Wipe paint out of brushes, lJ1e11:
I. Rinse 10 sanilM)' sewer. I. Rinse to s:u,it:ll)' sewer.
I. Remove lids. dispose ,1s trash. I. Remove lids. disr,ose :is lt:t.~h.
I. Dispose as hazardous waste. 1. T:ike to H HW drop-0ff.
I. Prevent entry into storm drain and
remove offsi1e
2. Wash onto dirt area. spade in
3. Collect (e.g. ·mop up) and
POTW disch.irgc 10 s.1nitary sewer
1. Use dry cleaning melllods
2. Coniain and dispose washwater as
hazardous was1e (Suggestion: dry
material first to reduce volume)
Q
~ .. C :,. ;· :,
:c II
&. g
7:'
~
""' -
3: II .. ,.,
':r' -'Cl ;:
DlSCHARGFJACTIVITY DUSINESS/COMMERCIA L
Disposal Priorities
General Construction and Painting: Street and Utility Maintenance (cont'd)
Non•hnwdous paint scr::iping/
SMd blasting
1. Dry sweep. dispose as trash
HAZARDOUS paint scraping/sand bl;uting l. Dry sweep, dispose as
(e.g. marine paints or p:unts containing h:uardous waste
le:id or tnbutyl tin)
Soil from excavations during periods I. Should not be plnced in street or
when stonns arc forecast on paved :veas
2. Remove from site or backfill by
end or d.1y
3. Cover wi1J1 t.,rp,\Ulin or surround
with hay brues, or use oilier
runoff controls
4. Place filter mat over storm drain
Note: Thoroughly sweep following removi\l of
dirt in nil four :iltem:itives.
Soil from excavations placed on p:ived I. Keep material out of s1onn convey:uice
surfaces during periods when stonns are not systems :uid U1oroui;hly remove via
forecast sweeping following removal of dirt
Cleaning streets in consll\Jction areas I. Dry sweep ·and minimize tr:icking of
mud
2. Use sill ponds and/or similM pollutant
reduction techniques when nushing
pnvement
Soil erosion, sediments I. Cover disturbed soils, use erosion
controls. block entry 10 stonn drain.
2. Seed or plant immedi:ilely.
Fresh cement. grout, monar I. Use/reuse e1.cess
2. Disoose 10 trash
Washwater from concrete/mortar I. Wash onto dirt area. spade in
(etc.) cleanup 2. Pump and remove to appropria1e
disposal facility
3. Settle, pump water 10 s.init.'Vy sewer
Auregatc wash from driveway/patio
construction
I. Wash onto din area. spade in
2. Pump and remove 10 appropriate
disposal facility
Approval
POTW
rv'\'MII
Table 4.1 (Con11nued)
Page 2
RESIDENTIAL
Disposal Priorities
l. Dry sweep, dispose as trash
I. Dry sweep, take 10 HHW drop-off
I . Use/reuse excess
2. Disr,ose :is tr:lSh
I. Wash on10 dirt area. sp:idc in
2. Pump .ind remove to appropn:He
dispoS.11 f:icility
3. Settle. pump w:11er to s.,n it.ir; sewer
I. Wash on10 dirt area. sp;ide in
2. Pump and remove 10 approprr:11e
dispos~I focility
1 C" • .,,. "'""""' ,,,.,,,.., In <~ni1•1r•1 C/t wrr
~ a :?'
C ...
o· :,
:i:
Ill s.
8 ~
~
~ N
:: " .,
l'I F -,0
~
DISCHARGF/ACTIVITY DUSINESS/COMMERCIAL
Disposal Priorities
General Construction and Painting; Strut and Utility Maintenance (cont'd)
Rinsewatcr from concrete mixing trucks I. Rctum truck to yard for rinsing
into pond or din area I 2. At construction site, wash into pond
or dirt area
Non-h:iz.ardous construction nnd I. Recycle/reuse (concrete, wood, etc.)
demolition debris 2. Dispose :is trash
HazMdous demolition and
construction debris (e.g. asbestos)
I. Dispose as hazardous waste
Saw-cut slurry I. Use dry cuuing technique and sweep
up residue
2. Vacuum slurry :ind dispose off-site.
3. Block stonn drain or bcnn wilh low
weir as necessary 10 aJlow most solids
to seule. Shovel out gu11ers: dispose
residue 10 dirt area. construction yard
or 1.-indli II.
Construction dewatering
(Nonturbid. unconwninat.cd uoundwa1er)
I. Recycle/Reuse
2. Disclw~e 10 stonn drain
Construction dewatering (Other lhan I. Recycle/reuse
nonturbid, uncontaminated groundwater) 2. Discharge 10 sanitary sewer
3. As appropriate, treat prior 10
dhcharge 10 stonn drain
Ponable toilet waste I. Leasing comp:u,y shaJI dispose
10 saniiary sewer at POTW
Leaks from garbage dumpsters I. Colic.cl. contain leaking material.
Eliminate le:lk, keep covered,
return 10 leasing company for
immediate repair
2. Jr dumpsl.Cr is used for liquid
wast.c. use plastic liner
Table 4.1 (Co-.ct)
.6e 3
RESIDENTIAL
Approval Disposal Priorities
I. Recycle/reuse (concre te, woo<l. etc.
2. Dispose :is tr.ish
I. Do 1101 aucmpl 10 remove yourself.
Cont.ac t il$bcstos removal service for
s:ue remov:il :mu uispo!i.11
2. Very small :unounts (less thM S lbs)
mny be double-wrilppcd in pl:1s1ic and
t.'\ken 10 HHW drop-off
POTW
Reg. Bd.
POTW
Ci 0 a -.,
C ,.,
o· = :z: 1w = Q,
f 7'('
..
\,,I \,,I
~ -., .. ..,
:" -'O ~
DlSCHARGF/ACTlVITY UUSINESS/COMMERCIAL
Disposal Priorities
General Construction and Painting: Strefl and Utllily Maintenance (cont 'd)
! Le:iks from construction debris bins I. Insure th:it bins are used for dry
nonhazardous mmerials only
(Suggestion: Fencing, covering help
prevent misuse)
Dumpster cle:i.ning waler I. Clean nl dumpster owner's focilily
:ind discharge wnsre lJ1rough grense
interceptor 10 snniwy sewer
2. Cle:1.11 on site ru1d dischnrge IJlfou;:h
gre:i.se i111erce111or 10 s.111itnry sewer
CleMing driveways, p,wed :u-eas • I. Sweep nnd dispose as lrash
(Special Focus • Resuur:int :i.lleys Grocery (Dry cleaning only).
dwnpst.cr areas) 2. For vehicle leaks, resuurnnt/grocery
alleys, follow this 3-slcp process:
a. Cle:Ul up leaks with ra~s or
absorbents.
b. Sweep, using grnnular
absorbent maLCrial (cal liner).
• Note: Local drought ordin:u1ces may
c. Mop nnd dispose of mopw:iter 10
s.init.'\fy sewer (or collect rinsewn1cr
conuin additional restrictions and pump to lJ1e s.111it.if)' sewer).
3. Same as 2 nbove, but with rinsewn1er
(2c)(no soap) discharj!ed 10 storm dr:iin.
St.cam cleaning or sidewalks, plaz:i.s • I. Collect all waler and pump 10 s.111i1nry
sewer.
2. Follow this 3-step process:
a. Clenn oil leaks with rags or
adsorbents
• Note: Local drought ordinances may b. Sweep (Use dry absorbent as needed)
conuin additional restrictions c. Use no soap, discharie 10 storm drain
Potable water/line flushing I. Dcoctivate chlorine by
Hydrant tesling muimizing time water will uavcl
before renching creeks
Super-chlorinated (nbove I ppm) water I. Discharge 10 saniwy sewer
from line nushing 2. Complete dechlorinalion required
before dischar~e to storm drain
Approval
POTW
POTW
Table 4. I (Conti nued)
Page 4
RESlDENTIAL
Disposal Priorities
t. Sweep anti dispose ns tr.1sh (Dry cleaning
only).
2. For vehicle leaks, follow this
3-step process:
a. Cle:u, up lei\ks with rnss or
nbsorbc1m; dispose :i.s hnzarclous
wns1e.
b. Sweep, using irnnul:v
nbsorbenl mnlerial (cat liner).
c. Mop and dispose of mopwa1cr
10 s.111i1ary sewer.
~
0 ~ ...
C ... -;· :,
:::c .. :,
Q.
f
...
~
:: ., .. ,,
':I" .. ...
,0 ~
DISCHARGFJACTIVITY
Landscapt/Garden Maintenance
Pesticides
'.
GMdcn clippings
Tree trimming
Swimming pool, spa, fou111.1in water
(emptying)
Acid or other pooVspN'fountain cleaning
Swimming pool, spn filter backwash
Vehicle Wastes
Used motor oil
Antifreeze
Other vehicle nuids and solvents
Au1omobi le batteries
Motor h0tne/consll\lction trailer waste -
DUSINESS/COMMERCIAL
Disposal Priorities
I. Use up. Rinse containers use
rinscw.itcr as product. Dispose
rinsed cont.1iners as irash
2. Dispose unused pesticide ns
haznrdous waste
I. Compost
2. Take to L.,ndfill
I, Chip if ncccss:try. before
composting or recycling
I. Do not use met.1l•based algicides (i.e.
Copper Sulfate)
2. Recycle/reuse (e.g. irrigation)
3. De1.enni11e chlorine residual • 0, wni1
24 hours :uid then dischnn:c 10 stonn drain.
I. Neul/alize .vid dischMgc 10 So'\.niwy
sewer
I. Reu~c for irrigalion
2. Dispose on dirt MC:l
3. Sc1tle, dispose 10 sanit:try sewer
I. Use sccond:iry containment while
storing, send 10 recycler.
1. Use secondary cont.aininent while
storing, send to recycler.
I. Dispose as hazardous waste
l. Send to auto bauery recycler
2. Take to Recycling Center
l. Use holding t.ank. Dispose to
S.'\lliWy sewer
Table 4.1 (Co;
5
RESIDENTIAL
Approval Disposal Priorities
I. Use ur,. Rinse cont:\.incrs, use
rinscwn1cr as pcsliciclc. Dispose
rinsed container i\.S tr:t~h.
2. Take unused pcstidcle to HHW clror •
off
I. Compost
2. Dispose ilS ll':1$h.
I. Chip if necessary, before composting
or rccyclinl!
I. Do 001 use metal-based al0ici<1cs (i.e.
Copper Sulfate)
2. Recycle/reuse (e.g. imgn1 ion)
3. Dctcnninc chlorine rcsidunl = 0, wnit
P01W 24 hours and then disclrnrcc 10 slonn dr:1i11.
P01W
I. Use for l:u1dsc:1pc irrigation
2. Dispose on dirt nrca
3. Sc1t le. dispose 10 s.u1i1ary sewer
I. Put out for curbside recycling pickup
where available
2. Take to Recycling Facility or nuto
service rncility witJ1 recycling progr:un
3. Take to HHW events acccrtini: mo1or oil
I. Take to Recycling Facility
I. Take lo HHW even!
I. Exch:vige :it rct:1il outlet
2. Take 10 Recycli ng F:icil i1y or HHW c ·,,:111
where b:-illcries .vc :iccer,tcd -
I. Use holding uu1k, dispose 10 s:v,iwy
sewer.
(')
0
c:l :.
C ,.,
o· :,
: II :,
Cl,
f -,,:'
,,.
•
t.l
VI
:::
!;
l'I !" ... :: ...,
DISCHARGFJACTIVITY
V,hicle Wastes (cont'd)
I
'Vehicle Washing
Mobile Vehicle Washing
Rinsewmer from dust removal at new car
nee1s
Vehicle leaks at Vehicle Repair Facilities
Other Wastes
Carpet cleaning solutions & other
mobile washing services
Roof drains
Cooling wat.er
Air conditionin2 condensate
Pumped sroundwatcr, Infiltration/
foundation dra.inase (conwninated)
F'are O&hting nows
DUSINESS/COMMERCIAL
Disposal Priorities
I. Recycle
2. Oisch:irge to sanitary
sewer, never to stonn drain
l. Collect washwater Md disch:irge 10
sanitary sewer.
l. Discharge to sanit.,ry sewer
2. If rinsing dust from exterior surfaces
from appc.vance purposes, use no sonp
(water only); disch:iri:e to stonn dr:iin.
Follow this 3-step process:
I. Clean up lel\ks with rags or nbsorbents
2. Sweep, using granular absorbent
materinl (cat liuer)
3. Mop and dispose of mopw:iter to
s:u1it.1ry sewer.
I. Dispose 10 saniwy sewer
I. If roof is co111.amina1.cd with
induslri:il w:is1e products,
discharge to s:iniury sewer
2. If no conwnination is present,
discharge 10 stonn drnin
. I. Recycle/reuse
2. Discharge to sanitary sewer
I. Recycle/reuse (landsa.ping. etc.)
2. Treat if necessary; discharge to
sanlt.ary sewer
3. Treat and discharge to s1onn drain
tr cont.amination is present, Fire Dept.
will au.empl 10 prevent now 10 sll'Cain
or stonn drain
Approval
POlW
POlW
P01W
POTW
P01W
Reg. Bd.
POlW
Rei. Bd.
T;ible 4.1 (Continued)
Page 6
RESIDENTIAL
Disposal Priorities
I. Take to Commercial Car Wash.
2. Wash over lawn or dirt nre:1
3. If soap is u~cd, use n bucket for soapy
w:iter nnd discharge remaining so;1py
water to s:u,iwy sewer.
I. Dispose 10 s:u1i1.vy sewer
0
4.0 BEST MANAGEMENT PRAcnCES FOR EROSION AND SEDIMENT CONTIWL
4.1.2-a Preservation of Existing Vegetation
ENCROACHMENT WITHIN
DRIP llNE PERMITTED ON
ONE SID£ ONl Y
INCORRECT
SECTION
DRIP
LINE
TREE PROTECTION FENCING
DRIP llNE
TREE PROTECJJQH IN FILLED AREAS
PROTECTION OF TREES
AND OTHER VEGETATION
CORRECT
~IN
ISOM!:TRIC
Source:
Unknown
0
4.0 BEST MANAGEMENT PRACTICES FOR EROSION A.ND SEDIMENT CONTROL
4.1.3-a Minimize Disturbance and Buffer Strips
BUFFER STRIP OF VEGETATION
On construction sites, a 50 foot buffer (filter) strip of undisturbed vegetation
should be left along all watercourses and property lines. Jhis strip reduces
water velocity and traps sediment, thereby reducing sediment delivery to surface
waters or to adjacent properties.
Special care should be taken during the construction process to see that soil is
not washed into a body of water, Conventional snow-fencing should be erected
along the limits of planned soil disturbance to prevent machinery and debris
from entering the buff er strips or watercourses, and to limit the disturbance of
soil and vegetation to what is absolutely necessary.
EXISTING WATERWAY
NATURAL FILTER STRIPS
OF VEGETATION
Source:
nrC"'T u • >.1 • rr,n-,vT l>'D A rT,r"'<: -S:-OR ~~ N nrr.r.o COUNTY -1998
Unknown
4-11
4.0 BEST MANAGEMENT PRACTICES FOR EROSION AND SED[MENT CONTROL
4.1.5-a Land Grading for 1\1inimizing Erosion
10"/. SETTLEMENT ~ I
0.3· FREE BOARD\ "--=r======================;;ai
-~!:imn~----------::1-----,----------------------
DESIGH now DEPTH ~~~~·
TYPICAL PARABOLIC DIVERSION
10¼ SETTLEMENT"-=
0.3' FREE BOARD ----==r
rmm===------·------J-..f -----------------------
DESIGN FLOW OEPTli
TYPICAL TRAPEZOIDAL DIVERSION
TYPICAL VEE-SHAPED DIVERSION ·
DIVERSIONS Source:
Va. DSWC
BEST MANAGEMENT PRACTICES FOR SAN DIEGO COUNTY-1998 4-JS
4.0 BEST MANAGEMENT PRACTICES FOR EROSION AND SEDIMENT CONTROL
4.1.5-b Land Grading for J\,Jinimizing Erosion
DIVERSION
SECTION OF DIVERSION AT TOP OF SLOPE
DIVERSION: INTERCEPTS
STORM WATER RUNOFF
DIVERSION CONTROL MEASURES CAN INTERCEPT
STORM WATER RUNOFF BEFORE IT REACHES SLOPES
Source:
DIVERSION DIKE
BEST l'ttANAGEMENT PRACTICES FOR SAN DIEGO COUNTY -1998
Unknown
4-16
4.0 BEST MANAGEMENT PRACTICES FOR EROSION AND SEDIMENT CONTROL
FLOW
.
'°
4.3.1-a Geotextiles and l\1ats
ANCHOR SLOTS: BURY THE UP-CHANNEL EHD OF THE
NET IN A 12" DEEP TRENCH. TAMP lHE SOIL FIRMLY.
STAPLE AT 12" INTERVALS ACROSS THE NEl.
OVERLAP: OVERLAP EDGES OF THE STRIPS
AT LEAST 4·. STAPLE EVERY 12" DOWN THE
CEITTER OF THE STRIP.
JOINING STRIPS: INSERT THE NEW ROLL OR NET IN A
TRENCH, AS WITH THE ANCHOR SLOT. OVERLAP THE
UP.CHANNEL END OF THE PREVIOUS ROLL 1S-AND
TURN THE END OF THE PREVIOUS ROLL. JUST BELOW
THE ANCHOR SLOT, LEAVING s· OVERLAP.
CHECK SLOTS: ON ERODIBLE SOILS OR STEEP SLOPES,
CHECK SLOTS SHOULD BE MADE EVERY 15 FEET.
INSERT A FOLD OF THE NET IITTO As· TRENCH AND
TRAP FIRMLY, STAPLE AT 12· 1NTERVALS ACROSS THE
NET. LAY THE NET SMOOTHLY ON THE SURFACE OF THE
SOIL · DO NOT STRETCH THE NET, AND DO NOT ALLOW
WRINKLES •
ANCHORING ENDS AT STRUCTURES:
PLACE THE ENO OF THE NET IN A 12· SLOT
ON THE UP-CHANNEL SIDE OF THE
STRUCTURE. FILL THE TRENCH AND
.,.__ ___ TRAMP FIRMLY. ROLL THE NET UP THE
CHANNEL PLACE STAPLES AT 1T
IITTERVALS ALONG THE ANCHOR END OF
THE NET. .
INST ALLA Tl ON OF
NETTING AND MATTING
Source:
California Storm Water BMP
Handbook, Construction
Activity, March 1993.
BEST MANAGEMENT PRACTICES FOR SAN DIEGO COUNTY -1998 4-46
4.0 BEST MANAGEMENT PRACTICES FOR EROSION AND SEDIMENT CONTROL
4.3.1-b Geotextiles and 1\-tats
ON SHALLOW SLOPES, STRIPS
OF NETTING MAY BE APPLIED
ACROSS THE SLOPE.
-5~LLow -·· ..__. ~lOpr :r.:·-•:;-r---"' --.a1R1::::::il:=_ _ __
-:, I i=':T= Is --: ~ _, ____ _
·--~--:~
SECTION
I I ' I I I I I I I ' I
I ' ' I I I I I I I I I I I
. ' ' ' I I , I I I I •
. I • I I ' ' I . I ' I I • I I I I I I I I I
I I ' I I I I I I I I
I I ' 1 I I ' O I , t I I I I I
I I I I I I I I I
I I I I I I I I
' I I I ' ' o I I I I
' , I I I I I
I ' I I I I I I
' ' ' ' ' ' I . I ' • I • I 1 I I
I . ! I I I I I I I I I I
-U ' I I I I I I
ISHALLOW SLOPES)
f..L.Af!
IN DITCHES, APPLY NETTING PARALLEL TO THE
DIRECTION OF FLOW. use CHECK SLOTS EVERY
15 FEET. 00 NOT JOIN STRIPS IN THE CENTER
ON STEEP SLOPES, APPLY STRIPS
OF NETTING PARALLEL TO THE
DIRECTION OF FLOW ANO ANCHOR
SECURELY.
s.,ccp I'
.a:--r,u..in.,...,.~ S(o Pc
I I • I I . I I I I I ' I I I I : I • I I I I I I I I • I
' I I I I I I I I I I I I I ' t I I I I I I I I I I I I I I
I I I I I I I I I I I I I I I
i I I I I I I I I I I I I ' I
I I I I I t I • • I I ' I
I I I I I I I I I I I I
I I I I I I I I I I I I ' I
I ' I I I I I I I I I I I I
I I I I ' I
I I I I I I I I I I ' I
I
I I I I I I I I I I I ' I ' I I I I I I ' '
ISTEEP SLOPE I
~
OF THE DITCH. __1. ~1 ANCHOR --=r TRENCH
SECTION
FLOW
I
I
I
I
IDITCH)
PLAN
BRING NETTING OOWH TO A LEVEL BEFORE
TERMINATING TliE INST ALU. TION. TURN THE
ENO UNDER r ANO STAPLE AT tr INTERVALS.
BERM
;...
WHERE THERE IS A BERM AT THE TOP OF
THE SLOPE, BRING THE MATTING OVER THE
BERM ANO ANCHOR IT BEHIND niE BERM WITH
A 12"' ANCHOR TRENCH.
Source: ORIENTATION OF
NETTING AND MATTING
California Storm Water BMP
Handbook, Construction
Activity, March 1993.
BEST MANAGEMENT PRACTICES FOR SA.~ DIEGO COUNTY-1998 4-47
4.0 BEST MANAGEMENT PRACTICES FOR EROSION AND SEDIMENT CONTROL
Fill
4.3.3-a Temporary Stream Crossing
AGGREGATE FIU
\ "-Fill ER CLOTH
HIGH FLOW AREA
FLAT BANKS
FILTER CLOTH
MULTIPLE PIPES
Fill
-----
STEEP BANKS
FILTER CLOTH
MULTIPLE PIPES
AGGREGATE Fill PER
M.A.G. SPECIFICATIONS
FILTER CLOTH
Source: TEMPORARY ACCESS
CULVERT
California Storm Water BMP
Handbook, Construction
Activity, March 1993.
BEST MANAGEMENT PRACTICES FOR SAN DIEGO COUNTY -1998 4-56
4.0 BEST MANAGEMENT PR.~CTJCES FOR EROSION A.ND SEDTh1ENT CONTROL
4.3.3-b Temporary Stream Crossing
FILTER CLOTH
AGGREGATE APPROACH
S:1 MAXIMUM, SLOPE ON ROAD
L
:~~,:;~tLOW DIVERTED
BY SWALE
WATER LEVEL SURFACE FLOW DIVERTED \
AGGREGATE --~ ORIGINAL STREAM BED
FILTER CLOTH
Source: TEMPORARY ACCESS
FORD
California Storm Water BMP
Handbook, Construction
Activity, March 1993.
BEST MANAGEMENT PRACTICES FOR SAN DIEGO COUNTY -1998 4-57
" . ' · .. _)
4.0 BEST MANAGEMENT PRACTICES FOR EROSION AND SEDIMENT CONTROL
COMPACTED Fill
2 :1 SLOPE--...
OR FLATTER,
BOTH SIDES
GRADE LINE
4.4.1-a Earth Dikes
B
REQUIREMENTS BASED ON UPSTREAM DRAINAGE AREA
DIKE 1
(5 ACRES OF LESS)
A-DIKE HEIGHT 18"
B-DIKE WIDTH 24"
C-FLOW WIDTH 4'
D-FLOW DEPTH a~
TEMPORARY DIVERSION
DIKE
DIKE2
(5-10 ACRES)
36"
36"
6'
15"
Source:
California Storm Waler BMP
Handbook, Construction
Activity, March 1993.
Rf.<;T M ANAGEJ\fENT PRACTICES FOR SAN DIEGO COUNTY -1998 U6
~.
_i ·-
4.0 BEST MANAGEMENT PRACTICES FOR EROS JON AND SEDIMENT CONTROL
4.4.2-a Temporary Drains and Swales
, 3:1 OR FLATTER 7
I
18 .. (MIN.)
----
2' (MIN.) STABILIZATION
LEVEL
CROSS SECTION
0.5% OR STEEPER.
DEPENDENT ON TOPOGRAPHY
ST ABLE OUTLET REQUIRE
PLAN
TEMPORARY DRAINAGE
SWALE
...
Source:
California Storm Water BMP
Handbook, Construction
Activity, March 1993.
BEST MANAGEMENT PRACTICES FOR SAN DIEGO COUNTY -1998 4-70
~ ' i ._../
4.0 BEST MANAGEMENT PRACTICES FOR EROSION AND SEDIMENT CONTROL
60
4.4.3-c Slope Drain
SIDE SLOPE = 2: 1
EARTH DIKE
CORRUGATED
METAL PIPE
4'MIN.
ATLESSTIWl
1'!. SI.OPE
·STANDARD FLARED
ENTRANCE SECTION
MIN. INLET SLOPE 3%
H = 0+12"
DIAMETER (D)
RIPRAP SHOULD CONSIST OF 6' DIAMETER STONE
PtACED AS SHOWN ANO SHOULD BE A MINIMUM
OF 12° IN THICKNESS.
Source: PIPE SLOPE
DRAIN (RIGID)
California Storm Water BMP
Handbook, Construction
Activity, March 1993.
BEST MANAGEMENT PRACTICES FOR SAN DIEGO COUNTY -1998 4-78
,
_/
4.0 BEST MANAGEMENT PRACTICES FOR EROSION AND SEDTh1ENT CONTROL
4.4.3-d Slope Drain
ALTERNATE:
SEDIMENT TRAP
(SEE BMP 4.5.6)
FLEXIBLE PIPE
PIPE ELBOW
WATERilGH1
CONNECTING
BAND
◄-MIN@LESS
THAN 1% SLOPE
SEDIMENT TRAP
RIPRAP SHOULD CONSIST OF 6.
DIA STONE Pl.ACED AS SHOWN.
DEPTH OF APRON SHOULD EQUAL
THE PIPE OIAANO RIPRAP SHALL
BE A MINIMUM OF 1, IN THICKNESS.
0 "'
LENGTH AS
NECESSARY TO
GOTHRU DIKE
.H:0+12°
30
ALTERNATIVE SEDIMENT TRAP: RIPRAP PLAN
PIPE SLOPE
DRAIN (FLEXIBLE)
Source:
California Storm Water BMP
Handbook, Construction
Activity, March 1993.
BEST MANAGEMENT PRACTICES FOR SAN DIEGO COUNTY -1998
-' i J . _,,·
I \ \J
4.0 BEST MANAGEMENT PRAcnCES FOR EROSION AND SEDIMENT CONTROL
4.4.4-a Outlet Protection
FILTER FABRIC
FILTER FABRIC
PIPE OUTLET TO FLAT AREA
WITH NO DEFINED CHANNEL
La
PIPE OUTLET TO WELL-DEFINED CHANNEL
La = LENGTH OF APRON
do = INSIDE PIPE DIAM ET ER
w = APRON WIDTH
d = APRON THICKNESS
NOTES:
1. APRON LINING MAY BE RIPRAP.
GROUTED REPRAP, OR CONCRETE.
2. PIPE DIAMETER. APRON DIMENSIONS.
AND AVERAGE ROCK SIZE FOR
RIPRAP ARE BASED ON THE DESIGN
FLOW RATE ANO VELOCITY. La ANO
ROCK SIZE MUST BE SET TO SLOW
THE FLOW TO NON-EROSIVE
VELOCITIES (e.g., LESS THAN 10 fps).
SEECALTRANSANDLOCALAGENCY
DESIGN CRITERIA FOR APPROPRIATE
SIZING CRITERIA.
3. d = 1.5 TIMES THE MAXIMUM ROCK
SIZE DIAMETER BUT NOT LESS THAN 6
INCHES.
Source:
PIPE OUTLET CONDITIONS California Storm Water BMP
Handbook, Construction
Activity. March 1993.
BEST MA.NAGEl\ll:NT PRACTICES FOR SAN DIEGO COUNTY-J998
\J
/
4.0 BEST MANAGEMENT PRACTICES FOR EROSION AND SED[MENT CONTROL
4.5.4-a Brush or Rock Filter
(TREE/RESIDUAL MATERIAL
WITH DIAMETER > 6")
1. EXCAVATEA4" X 4· TRENCH ALONG
THE UPHILL EDGE OF THE BRUSH
BARRIER.
3. BACKFILL ANO COMPACT THE
EXCAVATED SOIL.
2. DRAPE FILTER FABRIC OVER THE
BRUSH BARRIER AND INTO THE
TRENCH. FABRIC SHOULD BE
SECURED IN THE TRENCH WITH
STAKES SET APPROXIMATELY 36"
O.C.
4. SET STAKES ALONG THE DOWN-
HILL EDGE OF THE BRUSH
BARRIER. AND ANCHOR BY TYING
TWINE FROM THE FABRIC TO THE
STAKES.
CONSTRUCTION OF A BRUSH
BARRIER COVERED BY
Source:
Va. DSWC
__ FILTER FABRIC
RF$T MANAC.f.l\fi:NT PRACTICES FOR SAN DIEGO COUNTY-1998 4-125
. .___,)
·-~
4.0 BEST MANAGEMENT PRACTJCES FOR EROSION AND SEDIMENT CONTROL
4.5.6-a Sediment Trap
SEDIMENT TRAP
Small temporary basins formed by excavation or embankment can intercept
sediment-laden runoff and retain the sediment. The purpose of a sediment trap
is to prevent sediment from continuing down the slope. Because sediment
traps can full quite rapidly, they must be inspected, maintained, and cleaned out
frequently. Plan their locations so that they will be accessible to construction
equipment for maintenance. Sediment traps should discharge sediment-free
water into a stable watercourse.
PERIMETER DIVERSION
AND SEDIMENT TRAP
~y.:,
i, ~ ' '::l ..... _,
"ud-b ~ -:j..-<).,1
~ ~
PERIMETER
DIVERSION
Source:
Unknown
BEST MANA CEMENT PRACTICES FOR SA."i DIEGO COUNTY-1998 4-JJ7
~ I I ·._/
-
__ /
4.0 BEST MANAGEMENT PRACTICES FOR EROSION AND SEDIMENT CONTROL
ORIGINAL
GROUNO
ElEV.
4.5.6-b Sediment Trap
67 CU. YO/AC~~
67 CU. YD/AC'-E
(EXCAVATED)
I ,. I ~AAIABLE I
I I V~l"!3lE I I
VARIABlE
OiUGINAl
GROUNO
ELEV.
• S(C Pl.AT( .J.13-1 COARSE AGGREGATE-Cl.ASS I RIPRAP
CROSS SECTION OF OUTLET
Cl.ASS I RIPF-AP LENGTH (IN FEi:T) •
6 X DRAINAGE AREA
( INAC)
.. COARSE AGGREGATE SHALL BE VOOT 13.1357 OR ts
OUTLET (PERSPECTIVE VIEW)
DIVERSION
TEMPORARY
SEDIMENT TRAP
Source:
Va. DSWC
BEST MANAGEMENT PRACTICES FOR SAN DIEGO COUNTY -1998 4-138
,\ • I \ I ·-----
;
i ··"
4.0 BEST MANAGEMENT PRACTICES FOR EROSION AND SEDIMENT CONTROL
4.5. 7-a Sediment Basin
SEDIMENT BASIN
A sediment basin is a temporary excavation or embankment designed to intercept
sediment-laden runoff and to trap and retain sediment These strictures can handle
larger flows than sediment traps, and have a life of up to 3t3 months. Permanent
basins (designed to function longer than 36 months) may also be used, and must be
designed to conform to construction and perfonnance criteria appropriate for
pennanent structures.
Temporary sediment basins may be used ONLY IF:
1. Failure of the structure would not result in loss of life or interruption of use or
service of public utilities, AND ....
2. The drainage area is less than 1 00 acres, AND ....
3. The water surf ace at the crest of the emergency spillway does not exceed 5
acres.
Sediment basins which do not meet any of the above three criteria should be
considered permanent structures, and should be designed as such.
EMERGENCY SPILLWAY
STONE Fil TER ( SPILLWAY OUTLET
,-. WITH ANTI-SEEP COLLARS
.
PERFORATED RISER PIPE RIP RAP.,/
TO PREVENT
SCOURING
PROFILE THROUGH
EMBANKMENT SEDIMENT BASIN
Source:
BEST MANAGEMENT PRACTICES FOR SAN DIEGO COUNTY -1998
Unknown
4-143
APPENDIX2
Post-Construction Treatment Control BMPs
5. TREATiWENT CONTROL Blvf.Ps
INTRODUCTION
lhis chapter
describes
specific
treatment
conttol Best
:"-1anagemenc Practices (BMPs) for removing
pollutants in storm wacer from urbanized areas.
Each fact sheet contains a cover sheet with:
• A description of the BMP
• Suitable Applications
• Selection Criteria
• Limitations
• Design and Sizing Considerations
• Construction/Inspection Considerations
• Maintenance Requirements
• Cost Considerations
Toe side bar presents information on which
BMP considerations, targeted constiruents, and
an indication of the level of effon and costs to
implement The remainder of the fact sheet
provides further information on some or all of
these topics, and provides references for
additional guidelines.
BMP fact sheets are provided for each of the
following controls:
Treatment Control BMPs
TCI Infaltratioo
TC2 W Cl Poods
TC3 COOSUUC'ted Wetlands
TC4 Bioflltcn
TC5 Extended Deceotioo Basins
TC6 Media Fllttatioa
TC7 Oil/Wuer Separa&ors and Wattr
Quality Inlets
TC8 Multiple Syst.c:mS
Municipal Handbook
GENERAL
PRINCIPLES
control B MPs.
There :ire
sever:11 gene:ll
principles thJt
lie applicable 10
.111 tre:umenr
• Priority should be given to source
control: Source control B MPs :ire
generally lbuc noc always) less expensive
than treatment control BMPs. Also.
treatment control BMPs will noc remove
all pollutants and their removal efficiency
is difficult to predict given the limited
understanding of the relationship between
facility design criteria and performance.
• Recognize the unique California
climate: With few exceptions most
storm water treaanent experience has been
in "wet" states where vegetation can be
maintained without irrigation. In contrast,
California's climate is semi-arid with lhe
exception of the north coast. The
treatment control BMPs that require
velCtativc cover may aot be practical for
many areas of California unless irrigation
is provided. Also, design criteria have
emerged from research of facilities located
in climates where the rainfall season is
coincident with the growth of vegetation.
However, in California. the wet season
does not occur during the pimary growth
season. Caution must be used in using
design criteria that have been developed
elsewhere in the nation.
• Design Storm Size: It is commonly
thought by chose unfamiliar with urban
runoff quality management thal design .
storms for sizing water quality controls
should be the same a.s those used for the
design of drainage facilities. lbis is aot
true. The damage done to a receivin1
warer by the pollutant wash-off of a 25
year storm (commonly used to size a
drainage system) is inconsequential to the
5 • 1 March, 1993
BMP: STORM ORAJN SYSTEM SIGNS
DESCRIPTION
StcociliDg of tbc storm drain system (inlecs, cau:.b twins. channels. and creeks) witb
prohibitive language/gnptlic icom disa>urages tbe illegal dumping o( unwaiued awcrials .
APPROACH
• Creare a volunteer work force to stencil storm dram inlets, and use municipal staff to
erect signs near drainage cbanncls and creeks.
• For a quick referenc::c oo disposal alcematives for specific wasces. sec Table 4.1, scso;
Illegal Dumpina Cooaol.
REQUIREMENTS
• Cost Coasider.Uiom
Volunteer wort fora: serves to lower pro,ram COSl
SleDCiliD1 Ides requite procurement or dura.blc/dispow)le items.
Need for stora,elmaintenaDCC of sreociliDg kits requires plannins.
Program can aid in tbe cualosinl of me suxm drain sysiem.
• Reaulatioos
Develop and enf0rcc an-ontioanarrtw requires inlets. c:arcb twins. chanoets. md
a=ts to be filled witb aoli-<Sumpio1, pollutioo preventioo sips.
• Adminisnlivc/Staffiog
Primary stat, demand is for program sewp to P"Ovide martetiog and lr.lioiog.
•· Oogoins/foUow-up SWf time is miahnal t,ccause of volunteer services.
• Minimum 2 persoas an: required for bip ttaffac areas. c:ommen:ia1 and iDdusttial
7.00CS.
Slaff rcquirrmeat ll pvpan beadquan.ers tor emcrJenciCS. questioos. CCC.
• Equipment
• Stonn drain sreocilio1 kill.
• Traioinl
TraioiD1 sessions or approUDl&dy I 0-15 minures will cover sac:ilin1 proce-
dures. includiol bow to WU. n=axd tcepin1, problem dram DOCation. '"-IC.
Proper bealtb and safecy proox:ol (buddy sysrem. nffte. beallb cooc:c1m. etc.).
PUBLIC EDUCATION/PARTICIPATION
• Promoce wluoteet services (individual and busiDeu) tbroup radio/tielevisioo ml mail·
Program Elements
T•r~ted Constituents • s.dinwnt • Nutrient•
0 Heavy.,,.,.,.
• Toxic M••ri•J. • F~tab,. ,.._,.,;.ta
• Oxytlfln O.rrwnd-
ing Suo.tllnc:iM
• OIi& G,...•
0 8-:teria & V1ru••
0
lm.,..mentatlon
Requl,.ments
0 C.,,ltal Ccwta
Q OAIICom
0 Regullttoty
0 swnn,
Q Training
0 Admlnlnatlv•
• High O Low
SC30 outcamplips.
• Public reportins or improper Wde disposal by a Hon.INE number slleDCikd onto lbe t---~-----1
SlDIID drain iDlcL
Manicipal Handbook Mardi. 1993
BM p: INFIL TRA TlON
DESCRJYflON
A family or systc:m.S in which tbe majority of tbe nmoff from small sronm is infilcrated into
the ground ratbef' than discharged co a surface wa&cr body. lnfiltraDOG sysrcms iDc:lude:
ponds, vaults, ireocbcs. dry wells, porous pavement. and cooaete grids.
EXPERIENCE IN CALIFORNIA
Infiliralion poods bave been used by many local jurisdictioos and Cal'Trans in the Central
Valley foe about three decades.
SELEC11ON CRITERIA
• Need co achieve b.ig.b level of particulate and dissolved pollutant removal.
• Suilable siic soils and geologic a>oditioDS; low po(CDtial for loog-(Cml erosioo in the
waicrsbcd.
• Multiple management objectives (e.1 .. ground water recbarge or runoff volume
cootrol).
LIMITATIONS
•
•
•
•
Loss of inflliralive C3fadty and bigb maiDtcnaDCC cost in fine soils.
Low removal oC dissolved pollutants in very coarse soils.
Not suilable oo fill sites « steep slopes.
Risk oC ground wacer concarnioatioa in very c:oanc soils. may require pound waler
. rnooitcriag.
•
•
SbouJd not use uolil upscrca:n dnimge ~ is s&abilizicd.
Infilnlioo facilities a>u1c1 fall UDder Cbapca' 1s. Tide 23, ol Cali!onua Code ol
Rt"gnJarioos re1arding waw disposal ID land.
DESIGN A.ND SIZING CONSIDERATIONS
• Volume sized ro capture a paniaalar fraaioo ol annual runoff.
• Pretreatment ill fine soils.
• Emergency overflow « bypau for 1ar&er SIOnDS.
• Obscrvalioa well in IJeDChcs.
CONSTRUCTION/INSPECDON CONSIDERATIONS
• Prou:ct infil1J2DOG surface duriDI coascruaion.
• v esecatioa oC pood sides 10 prevc:nt crosioa..
• Frequent inspcaioa foe clogms duriDJ CX>OStruction.
Manicipal Handbook 5.3
Cons1derat ions
Watar Availability
ANthetica
Hydraulic Head
Targeted Constituents • S«Jiment
Q Nutriflnt.
• H .. vy Metal•
• Toxic MllterillJ.
• Flolltltb,. lat_..J.
• Oxygen O.fNnd.
ing Subatll~
• OIIA G,....•
• s.cte,w A .,.,,,,...
• U=•H.w SI lkant lm,-:t
0 ProlMb• Lotr or
UMnOWnl,npact
Implementation
Requirements
g CaplW Co.u
Q OAMeo.w
Q ,.,ntenance
0 Training
• High O Low
TC1
Marcb, 1993
Top \/rew
Side View
NOTE:
Additional Information -Infiltration
. , ., -----,,,,,,. ,,,,,,
8ac:ll•IIP Underdr.,n
--....._ --
1. Backup underdrain is net used in most appfications because plugging
occurs in soil~ the drain.
2. An infiltration basin can also be excavated (typically 2 to e fNt deep)
--
as bng u the bottom of the basin is 3 feet above high aeuonal water table.
FIGURE IA. INFILTRATION BASIN TC1
Muidpal Baoclbook 5-11 Maru, 1993
Additional Inf onnation -inrJ!tration
T:::,o View Side View
Inflow
I
Sid•• Ltned .,,11 PermeaDle Filler F1onc
Permeable Filter
Fabric One Foot
I.tow Surface.
Tripi 0Hril
Screened Overflow Pipe
'
Clean Was~ StOfte or Gravel
(1.5•l.0 Inell) ,:t2 Inell Sand Filter
o, Perm .. Dle Filter
Clotll Linea lonom
Soun:•: Schueler (1987)
BllLOtNG DRAIN OESk3N
0bMrVa1ion Wei
( Sheet Cover Mart.
FlGURE IB. INFILTRATION TRENCBFS
TC1
Manidpel Handbook 5-12 Mardi. 1'93
3: I l
[
[
"' • -,,.
j -! ~I~
◄ POROUS ASPIIAl T SURF ACE COURSE
112-lo 3/4" Atj!]l"t!ljdlc
c1sphc1llic mix
l .5 lo 4" lhid11,•·.·. I yp1, .d
◄ f ll Tt::R COUHSt
l /l" Ac_J~re I JI ,.
l" lh ickllC'>'>
◄ RESERVOIR BASE COURSl
1-lo 2" Ayyrt!l_)dlt!
Voids volume is tlc~HJ11t!d lo,·
runoff Helenliu11
Thidllc'>~ h lit.1.cd 1111 ':>1111 d•JC
rcqu i n:d
◄ fli. JfR FAORIC ------··----·
◄ EXISrlNG SOil
Hinimol coc11µddlu11 tu 1clt.1i11
poros ily cllld l)t!l"lllt!dhl Ii I y
Source. City ul Auckvdlo. Maryland
FIGORE ID. POROUS ASPlIALT PAVING TYPICAL SECTION
► a. a.
2
0 ::J D> -::J ....
0 -3
O> --· 0
::J
~
ei 8.
Additional Information -Infiltration
?ourtd-tn-?l1ca Sltb Cutal httd Un It
Lattice Unit
Source: State of Florida
FIGURE lE. 1YPES OF GRID AND MODULAR PAVEMENTS
TC1
5. 15
' : Additional Information -wet Ponds I
I I Gs:ocra/ i Toe Olal0r fcacurcs oi a wet pond arc s.bown in Figure :?A. lt 1s essentially a sma.1.1 lalce w1tb rooted wctJa.od vc!1e t.aooc
along the pcnmeter. Toe permancm pool of waler provides a qu,escem volume for conunued sea.I.mg of parucul.a.Le '
contamlllams and uplake of dlssolved coniam.inam.s by aquauc plant.s between stonru. Toe wetland vcgetauoo 1s present I
to improve tbe removal of dlssolved coowninams and ID reduce lbe formaooo of algal aws. However. given the need 10 i minimize the unpact on space. it may be cost-effccuve to use veru~ concrete rewnlllg walls wb1cb would not a.lJow for I emergent vcgctatJon. ' I
Toe average depc.b of the wet pool is generaJly 3 to 9 feel. altbougb greater deptbs arc possible w1tb arufici.a.J auxIDg. The I objccuvc is to avoid thermal stratification that could result in odor problems. Gentle aruf1C1al auxmg may be needed in I small poods because they are effectively sheltered from the wind. I
Toe wet pood oould be allowed to dry during tbc summer monlhs. Allowing the wet pond to dry bas not been tncd
elsewhere but seems feasible siDce the pood need DOt opcraie during the summer mootbs. Toe maJor problem with this
coocep< will likely be aesthetics 1'31bcr than perfcxmance.
Wet poods are of intete:St wbere me removal of the dissolved consticuent fractioo is oC cooccm, panicularty nuaimts and .
metals. Dissolved cornarninana are removed by a combinatioo of processes: physical adsorption to bouom sediments
and suspended fine sediments. natural cbcmical Oocculalioo, and upcake by aquatic planes. A wet pood with concrete
sides aod floor would therefore not likely provide any adv11uaae over tbc oon-vcgcwive ircaancnt concrol BMPs. Tbe
relative imponance of cacb mccbanism is DO< well undcfflOod. Very limifl:d dala prevents a defmitive cooclusioa as to
the cffcc1iveoess of wet ponds in removing dissolved cocuam.inaots. Reductioo in lbc dissolved fraction of pbospboNs
and some mecal.s have been observed but Ibis docs DO' occessarily m~ it is removed in tbe pood. It may be iDa>rpo-
ra&cd into algae CK absorbed 0010 fme particuJafe mauer wh.icb exits lbc facility in tbe cfflucoL U tbc primary removal
mecbanism is biololical, wet poods may DOt be particularty cffcc1ive io removing dissolved COPtamioanrs iD Calilom.ia
because most storms occur during wmtcr wbeo plant powm is minimal
Wet pond may be pre!em:d where lbc secoodary objective of acscbcac:s CK passive recn:atioo is imponaat. The rooced
vegeraaoo aloog tbe pood edges will p-ovidc some babiw for wetland animals Wet poods arc aeoc:rally aoc·fcasible io
dense urban areas due to tbe unavailability of land unless a pat CK open space is available and the p:,od can be designed
to ac:h.ievc ~ cw aestbetic objectives. Wet poods may have several side effeas mat may be coosidered unac-
cepcablc in a:nain silUatioos. Placed in residential developments. lbc wet pool may be C00Sidcrcd a safety buard (CK
small children allboug.b me iDcidcDce of drowning is rare where lbese facililies • in place. Fenc:ina the facility for
procccuoo can be acscbeac:ally displc8.1mg and diminishes rbc value oC lbc poad (CK passive recreatioo.
Aoocbcr coocept is tbe extended dcatioo wet pood in which tbe oudet of tbe facility is rcsuia.ed so as to retain a
cn:aaneut design storm oo top of tbe wet pool (CK a specified time. lt is believed Ibis added memure improves pcrf CK•
manc:e. The eCCea of ~g tbe oulftow is 10 reduce lbc overflow me during the s10nD iocreasiog lbc c:apcurc of
settkable solids. However, tbc majority of sealing occurs bel'tllecn ramer man durinC tbe suxms. Tbe extended dcteD-
tioa zone may tberefore provide liale inaancnral benefit. U vcrtical space is available tbe cooc:q,t oould be employed
because lbc added a>st may be nomiDal. See TC5 Extended Deteotioo Basins oo bow ro dercrminc tbc extended dcr.en-
tioa volume.
Dem
Two mecbods have been poposed fCK lbc sizing of wet ponds: oac prcdicar.ed oo tbe removal of particuLale con1aminaD's
ooly (USEPA. 1986) and one predica&cd oo tbe removal of pbospborus • well (Flarida. 1988; Maryland. 1986). Tbe
first method relales tbe removal errJcieocy of suspeDdcd sol.ids 10 pood volume. Tbe secood method provides a dcrentioo
TC2
~ I
Municipal &_~book 5 • 17 Mardi, 1993
BMP: BIOFILTERS
DESCRIPTION
Biofilten arc of two rypes: swale and scrip. A swale is a vegeta&ed dwmel lb.at treats
coocenaaied flow. A scrip treats sbcet Oow and is placed parallel to Cbe coocribucin1
surface.
EXPERIENCE IN CALIFORNIA
No biofil&crs specifically designed to a-ea1 suxm warer bave bceu located. However,
insWICCS of .. biofiltcr by bappeDsf.ance" wst in oonbc:nl commlmities <Davis. Sacnmeoto.
Turlock. Fresno) where storm warer is di.sdwged to a~ area prior tom inlet or an
iDfiluatioo area.
SELEcnON CRrrER.IA
• Comparable performance to wet poods and a>osauaed wetlands.
• Limited to trearinl a few acres.
• Availability of wau::r durinl dry se&SOCl.
LIMIT A TIO NS
• Poor performance bas occumd but Ibis appears to be due to poor dcsip.
• May be limited to area, when-sim,mc:r iniptioo is feasible.
• Can be difficult to maintain sbcct now in saips.
• CID be difficult to avoid c:ballDcliz.atioo iD swaa.
• Cannot be placed Oil Sleep slope.
• ·Area required may mate infeasible Oil iDdusuial sites.
• Proper mainrenance reqand _, maiDcaiD beallb and dc:Dsity of ve1euaon.
OF.SIGN AND SIZING CONSIDERATIONS
• The surface sea is defined by F1pre 4A.
• The minimmn widdl for a swale ls dc1crmiDed by Mannings EqUlbOll.
• Minimum lc:opi of a saip is 10 rcct..
• The IOGgimdiDal slope must DOt ~ 5~.
• Use a flOlr spreader .tDd c:neru dissipe10r at Cbe encnmce of a swale.
• Good soils are impon:IDl '> ac:bic-,e ,ood vqewioD a,vcr.
CONSTJlUcnON/INSPECDON CONSIDERATIONS
• Mm sure soils arc saicable for bcallby ve,ewioa..
• Level aou-scctioa and even loaplUdinal slope for swaJes.
• Achieve sbect flow widl slripl.
Manicipal Handbook 5-32
Considerahons
~
~ ~ ~
Aenh•tic.a
Hydraulic Head
Environmental Sa.
EffflCts
Targeted Constitu•nts • S«Jim«1t
g Nutri«tt•
Q Heavy "-tal•
Q Toxic ltl11t•ri•l6
g Float.bl• Mat.,;.16
Q O;ryt19n O.nwnd-
Ing SubnancN
Q 011.IGl'UH
0 s.:,.,.;. el Virv••
• =•H.w ..,,, lmpet:t
0 ,,,. ... ,.Low.
CMbownl,,,,,.:t
Implementation
A«lufrementa
Q CapllalCom
Q OelMConr
Q .,.,,,,.,.,,nc,e
0 Trelnlng
• High O Low
TC4
Mardi, 1993
BMP: EXTENDED DETENTION BASINS
DESCRIPTION
Extended deteotioo basins arc dry between srorms. During a stonn the ba.siD fills. A
outlet releases the storm waLCr slowly 10 provide time for sediments 10 settle.
EXPERIENCE IN CAL)J'ORNIA
1bcre are no lcoown extended deccolioo *ins in ~on:ua. Hydraulic: dcteotioo basins
may fuoctioo like extended detention basins if tbe former bas been sized 10 c:ooQ"Ol the pre-
development 2-year eveoL More liberal sW>dards do DO( provide sufficient deteolioo time.
SELEcnON CRITERIA
• Objective is ro remove ooly particuwe pollutants.
• Use where lack of waicr prevents the use of wet poods. wellaods or biofilten.
• Use where wet poods or wetlands would cause unacc:epcablc mosqui10 coodilioas.
LIMITATIONS
• May be less reliable lhao od>cr creaancut c:ootroi BMPs.
• IDability 10 vegcwc baok:s and boaom may n:sult in crosioo and resuspensioo.
• LlmiWioo of tbe orifice diameter may preclude use in small war.cnbcds.
• Requires differential elcvatioo between inlet and outleL
• Peodin1 their volume and depth basin dcsips may require approval from Swe
Divisioo or Safety of Dams.
DESlGN AND SIZING CONSIDERATIONS
• Bum volume is sized 10 capcure a paticular fnctioo oC tbe runoff.
• Drawdown time oC 24 10 40 bourl.
• Shallow *in with larJe surface area performs bcacr tbaD deep ba.siD with same
volume.
• P1acc energy dissipMm at lbc entnncc IO roioirnize tJoaom erosion and rcsuspc:nsioo.
• Vegetate side slopes and boaom., lbc maximum exrent p-actical.
• If side c:rosioa is particuJlrty seven:. c:oosider paving or soil s&.lbili.Wioo.
• If 0oatablcs .-c a problem. proccct outlet widl uasb rack or other device.
• Provide bypau or pm through capabilities for 100 year S10r1D.
CONSTRUCTION/INSPEcnON CONSIDERATIONS
• Mm sure the outlet is imcalled as desiped.
Mumcipal B~book 5 • 39
Considerat;o ns
Soil.s
G ru R.,quired----:;::>
s1o,,.
W•t•r Availability
Authetica
~
Environ,,.ntal Sic»
Eff«:ts
Targeted Constttuents • S«iiment
~ Nutrient.
Q Her,y.,,.,.,.
'-Toxic Ma•ri•,.
Q FloatabJ. lut.,•I•
'-Oxygen 0.,,.nd-
ing Subatanc.
'-Oil AG,._•
0 s.:,.,.;.' Vltw• • =•H--wt Imp.ct
0 ,,,.,,,,_,.Lowor
UnmHmlmpa:t
lm.,..,.ntation
~uirementa
• C.,,lulCam
g O&MC:O..
g a,./~
0 Trwlnlng
• High O Low
TCS
Marcia, 1993
Additional Information -Media Filtration
_, ___ Sediment Trap
Insert Box ... ... ... .. .. ... ... ... ... .. .. ... ... ..... ... .. .. ... ...
t ' '.
_________ ,..
I I ,----
Bypaaa OuUlow
Source McPherson ( 1992>
FIGURE m. CATCH BASIN FILTER
TC6
Marcia, 1993
Additional Inf onnation -Meo1a Fittmon
I I
Sediment Trap Ora.iii Pipe ----.I"". _ __j 10
Outlet
Structure
2· Gravel Layer
Over Pipe
Bottom of
Sedimentation
Basin
Section A-A
(Gravel Not Shown}
__ ::::::::-::1-+ To Outlet Structure
Perforated PVC Pipe .
Wrapped in Geotextile Fabric 8. SEDIMENT TRAP
Source City of Austin
FIGURE 6E. EXAMPLE RISER PIPE AND SEDIMENT TRAP DETAILS
TC&
5 -57 M.-dl, 1993
8MP: OIL/WATER SEPARATORS ANO WATER QUALITY INLETS
DESCRIPTION
OiVwaier separau:n are designed to remove ooe specific group of concarninaors: pctt0leum
compounds and grease. However, sepwau,rs will al.so remove Ooarablc debris and scale•
able solids. Two general types ol oil/waler sepamors are used: cooventiooal p-avity
scpanw,r and lbe coalescing plate inu:rcepcar (CPO. ·
EXPERIENCE IN CALIFORNIA
OiVwater separar.ors are in use lhrougbout California u induscrial sites. OUlwau:r sqma•
tors are used u all bulk petroleum sunge and refmery facilities. A few jurisdictions
require new commercial developments to install separaiors under cc:naiD situaliom dW are
eovitorunentally sensitive.
SELECTION CRITERIA
Applicable to siawioos wbcrc lbe a:>OCCDtratioa of oil and grease relar.ed compounds will
be aboormally high and source coocrol c:anoot provide effective cooaol. 1be geoen1 typcS
of bosioesses wbere this situation is likely n cruet. car, and equipment mainr=aoce and
wasbinf bosiocsses u well as,. bosmcv tt:lat performs mainrtmDCe oa its own equipment
and vehicles. Public facilities where sqwa1011 may be required include marine pocu.
airfields, fleet vehicle rnaintenmee and wasbing, facilities. and mass mnsit part-and-ride
Jou. Cooventiooal separators are capable of removin& oil droplets wilb diamela'S equal 10
or ,rearer tbao 150 microm. A CPI scpamror sboldd be used if smaller dropleCs must be
remo'!'ed.
LIMITATIONS
• Liale da&a oo oil cbatxtcrisac:s ill S1D11D wuet leads to axwdenble uncauiDly about
pcrformaocc.
• Air quality permit (cooditiooal aulbormtioa) permit-by-rule from DTSC may be
required.
DESIGN AND SIZING CONSIDERATIONS
• Sizins rewed 10 mciciplled iDOueot oil coocanra&ioo, wau:r tcmpcralUre and velocity,
Constderahons
Seil•
~
s1o,,.
W•t•r Availltbility
A-th•tica
Hydraulic H.-d
Environ,,.nt11/ Sid9
Eff«t.
Targeted Constituents
~ S«Jiment
~ Nutri.,,t•
g HeevyM.tal•
g Toxic M••ri•'-• Floatab,. l,ut.,.;.I•
'-Oxyg9n r,.,,.nd,
ing Sulwtanca
• Oil.I GrMN
0 Bacterie. v,,., ...
• =-~ ,-,,,,,,.,-:,
0 filrDW•Loww CMA:no.,,lmpcf
Implementation
R~utrementa
g C.,,llal Ca.t.
'-OAJIC:O.C.
g .,,.nt.~
0 Trelnlng
and lbe effluent 1oaL To mamlaiD reasooable scparaux size. it sbouJd be desiped 10 e High O Lo•
b)118S.' nows in excess of first Oasb.
CONSTRUCTION/INSPECTION CONSD>ERA TIONS
• Nooe identified TC7
MAINTENANCE REQUIREMENTS
• Cleam ~uc:ndy of accumula&.ed oil. sreac. and floating debris.
COST CONSIDERATIONS
• Coalacill1 pwe material is c:osdy but requires les.1 si-ce tbaD lbe a,oveutiooal
5 • 59 Mardi, 1993
BMP: MULTIPLE-SYSTEMS
IMFlLTAATlON ..,._\of. TRENCH 5,,.
~-.. .. "'
!
I
8 J
DESCRIPTION
A multiple ireaoneot system uses two or more of tbc prcccdms BMPs iD series. A few
multiple systems have already been desaibed: sealing bain combined wich a sand filrer;
sealing basin or biof1her combined wilh an infiltr.Uioo basin or treDCh; ex&mded dereotioo
iooe oo a wet pood.
EXPERIENCE IN CALIFORNIA
• Tbc rcseardl wetlands al Fmnoot. California are a combination of wet poods.
wetlaDds. and grass biofilters.
SELEcnON CRITERIA
• Need 10 prorea a downstream tn::aanent sysu:m
• Fnbaon::d reliability
• Opcimum use of tbc site
LIMITATIONS
• Available space
DESIGN AND SIZING CONSIDERATIONS
• Refer 10 individual cn:aanent caurol BMPs
CONSTJlUCTION/INSPEcnON CONSIDERATIONS
• Refer ID individual aeaancot 00Daol BMPs
MAINTENANCE REQUIREMENTS
• Refer 10 individual trcaanent 000aol BMPs
COST CONSIDERATIONS
Manklpal Handbook
Consio.rations
Soil•
~
~ ~
Ae.stMtic.s
Targeted Constituents • S«iitn«lt
'-Nutri.nt•
'-H..vylHtlll•
g Toxic "••ri•la • Flo•tab,. Alat.,;.I•
'-Oxygen O.rrand-
ing Su~t•ncu
g 011, G,....
g s,,c,-,., & V1rua ..
• u::,,,::--SI tlmpect
0 ProNble Low tK
Unmownlm,,.:1
lmpMmentation
Requl,.menta
• Capital Con• • O&IIC:O.. • lla/nt•MltCfl
0 Training
• High O Low
TCS
Marcb, 1993
APPENDIX3
Post-Construction Proprietary BMPs
Fossil Filter™ is Now Constructed of Non-corrosive Materials.
Our New and Improved
---
FOSSIL F.11.lER~Product Line .
Now manufactured from
• High Density Polyethylene (HOPE)
(plastic) and Petroleum resistant
fiberglass which meets or exeeds
PS 15-69
• All metal components are made
from stainless steel (Type 304)
Eliminated Galvanized
Steel from its Catch
Basin Filtration
System Product Lines.
(Galvanized steel may
actually add contaminants
to the waterways}
can us!
800-579-8819
For More Information on
These and Upcoming Products
Visit our website!
www.kristar.com
If it doesn't say "F0SSJL RLTERM'~ It lsn.'t!
ROUND OR
SQUARE-TO-ROUND INLETS
Fiberglass or HDPE unils ore available
lo fil various size inlels.
FLAT GRATED INLETS
Easily inslolled in 001 groled drainage
inlels found in mos! parking lols.
Cl 9Q7 KriS.O, E~. Inc:
fOSSl FITER'" ond lhe °""-' c1ooc11<.,,. reg-ed rademcwu d K,iSlo, E-i,rues. Inc:.
KtiSlot E-p,-. Inc:.• 422 LorlJ..ict C-• 5u,,e 271 • Sant, Rooo. CA 95403 • PH: 800579-8819 • FAX. 707-792-46tR • __ 1,,__a,m
CURB OPENING INLETS
FOSSIL FILTER'"' is easily onoched lo
inside face of inlel.
U.S. PATENT NO. 5,720,574
What you should know about the
FOSSIL FILTER™ with Fossil Rock TM,
the approved filter adsorbent.
FOSSIL FILTER™ is a trough apparatus,
which utilizes EPA approved adsorbents,
installed in water drainage inlets lo collect
petroleum hydrocarbons and other harmful
pollutonts while permitting the undisturbed
passage of water. FOSSIL FILTER™ was
designed especially for areas frequented
by motor vehicles and where runoff water
con be channeled .
FOSSIL ROCK™ (amorphous alumina
silicate) is on inert blend of minerals that
does not qualify as a carcinogen or as a
substance causing silicosis (a lung disease)
non-bicx:legrodoble and contains no
hazardous ingredients as defined by the
EPA, OSHA and WHO. It is non-injurious
lo asphalt, cement, soil, animal or plant
life. FOSSIL ROCK™ is totally nooleoching
which facilitates the disposal process.
Grated Inlets
Model No.
FF-160
FF-180
FF-240
FF-24360
Curb Opening Inlets
Model No.
FF-24DCI/FF-30DCI
NOTES:
FLO-GUARD Catch Basin Insert
FLOW RATE CHART
Inlet ID
l 6"Xl 6"
l 8"Xl 8"
24"X24"
24"X36"
Inlet Width
W= 3.50'
W= 4.00'
W= 5.00'
W= 7.00'
W=l 4.00'
W=21.00'
W=28.00'
Flow Rate
GPM/CFS
340/.757
340/ .757
530/1.18
680/1.52
Flow Rate
GPM/CFS
190/.42
314/.70
380/ .85
537/1.20
l 075 /2.39
1646/3.66
2150/4.79
1. Above flow rates are "calculated clean flow rates" based on geotextile
manufacturer published flow rate of 70 gpm /ft2 (Mifafi Filterweave 400).
Factors ranging from .25 to .SO should be applied to above flow rates
depending on anticipated levels of sediment and/or debris.
2. Flo-Guard catch basin inserts are designed to collect sed iment, trash,
and debris during low flows (first flush) while not impeding peak flows.
BERKELEY • DA VIS • IRVINE • LOS ANGELES • RIVERSIDE • SAN DIEGO • SAN FRANCISCO SANTABARBARA • SANI'A CRUZ
July 6, 2001
Mr. Doug Allard
KriStar Enterprises Inc.
P.O. Box 7352
Santa Rosa, CA 95407-0352
Michael K. Stenstrom, Ph.D., P.E., Professor
Department Of Civil And Environmental Engineering
4173 Engineering I, Box 951596
Los Angeles, Ca 90095-1593
Phone: (310) 825-1408
Fax: (3 10) 206-5476
Emai 1: stenstro@seas.ucla.edu
Subject: FloGard Catch Basin Insert Test Results
Dear Mr. Allard
This letter and attached graphs and figures serves as our preliminary report to you for the
testing we performed using your FloGard Catch Basin Insert. This letter reports the
results for oil and grease and sand particles (e.g., suspended solids) removal. We will be
providing a later report that describes the additional testing (using material collected from
the field and other devices). This is the second letter report.
We performed the tests in the same laboratory set up that we used in the earlier studies,
including the original study performed for the City of Santa Monica and the Santa
Monica Bay Restoration Project. The test was performed in a full-scale mock catch
basin. It is constructed of plywood and includes a stilling chamber, a 10-foot long by 24-
inch wide flume (to simulate street surface) and 36-inch wide catch basin. The entire
system is above grade to allow easy access and monitoring. The catch basin has an open
top that allows easy installation of a variety of inserts.
Figure 1 is a schematic of the test configuration. Tap water is metered into the system at
a known and constan.t fl.ow rate. High flow rates were measured using a Doppler effect
velocity meter, which measures the velocity of particles contained in the tap water. We
injected small amounts of compressed air to simulate particles. Lower flow rates were
measured with a paddle wheel meter. From here the flow continues to a stilling basin
that allows the pressure and velocity to decrease and dampen. The water then flows by
gravity through a flume to the catch basin. The contaminants are then released into the
flume where the flowing conditions provide adequate mixing. Water flows down the
flume and into the catch basin. For these experiments, the entire flow entered the catch
basin through the insert; no flow was bypassed.
Oil and Grease Removal Tests
Tests were generally performed for 30 minutes. The corrtaminants were added in the
flume, which provided mixing. Used crankcase lubricating oil (from automobiles) was
used as the oil and grease source. Influent oil and grease samples were collected as the
oil/water combination flowed into the insert. Effluent samples were collected by
capturing flow from the bottom of the insert. Samples were measured using our modified
oil and grease procedure. Efficiencies were calculated by subtracting the measured
effluent concentrations from the average influent concentration. All tests were performed
at constant flow rate.
Three oil and grease removal experiments were performed. The first lasted 30 minutes.
After the test conclusion, the samples were analyzed and the insert and sorbent were
allowed to dry. The second test was performed using the same sorbent, two days later.
Removal efficiencies were high and we decided to run the third experiment for 180
minutes. We allowed the sorbent to dry as before. We call this a sequential test. It is
performed over a sufficiently long period to show declining removal efficiency. We have
performed shorter tests in the past, and these are sometimes done to determine differences
in sorbent types or insert configuration.
Figure 2 shows the oil and grease removal rate. The initial efficiency is slightly greater
than 80%. After 240 minutes, the efficiency declined to approximately 60%. The
decline is typical and represents partial saturation of the sorbent material. The removed
oil and grease is easily observed on the sorbent material, as a black film. Figure 3 shows
the performance of the normal and high capacity models in the same graph.
Sand Particle Removal Tests
Sand particles were prepared by sieving sands from various sources, but mostly from
sand used for concrete construction. A series of ASTM standard sieves were used.
?articles were selected to demonstrate removal efficiency, as opposed to simulate
particles found in stormwater. The FloGard contains a woven nylon screen that
resembles a window fly screen. The screen has 8 pairs of filaments per centimeter, and
the openings between :filaments are approximately 400 by 600 microns (µm). Sieve sizes
of 20, 30, 40, 60 and 100 were selected; which produce particles from 149 to 2,000 µm.
Equa~ known masses of each sand particle size were released into the flume over a 30-
minute test. The particles flowed to the insert. Below the insert, a fine screen,
corresponding to 325-mesh, captured the particles not removed by the insert. At the end
of the test, the 325-mesh screen was removed and the retained sand particles were
collected, dried, sieved and weighed. The weight ofrecovered particles in each sieve size
was compared to the amount of sand released into the flume to calculate efficiency. As
2
expected the large particles were removed well. while the smaller particles were removed
poorly. The smallest sand particles are smaller than the mesh openings.
Three sand removal tests were performed. One was performed at 25 gallons per minute
(GPM) and two were performed at 15 GPM. Sand was added to create influent
concentrations equal to 65 to 100 mg/L. Figure 3 shows the results of three sand removal
tests. Figure 3 also shows the sizes corresponding to the sieve sizes. There is a range
because the sand retained on a sieve varies in size between that ret~ed on the lower
screen and the size of the material passed by the upper screen.
The larger particles are completely removed by the screen. The 40 mesh particles are
very close to the size of the screen openings, which may explain the variability in test
results. For this particle size, random effects, such as the shape of the sand particles or the
angle they impinge the screen, may be influence removal rate.
Our tests were all performed without trash and debris. Therefore there was little or n&·
clogging of the liner, which means that virtually all the water flows through the front part
of the filter area No increase in head loss was observed during these tests.
I will transmit these and other findings to you in a report soon after we finish the other
testing. I understand that you will show this letter to your potential customers. I ask that
you show them the entire letter and graphs in order for them to appreciate the results as
well as the limits of the work.
I look forward to working with you on future evaluations.
Very truly yours,
Michael K. Stenstrom, Ph.D., P.E.
Professor
3
Air Injection
Point
3 in. Tap water line .
• I
Control Valve
I 1s.oj •
Paddle Wheel
Flow Meter
@}]
Stilling
Chamber
• Doppler Effect
'--------'Flow Meter
Contaminant Fl Jif\
· Reservoir LJ_J ~etering
. Pump
► Q)
E
::::l
u..
Q)
"'C
3:
.c:
(.)
C:
~ N
Effluent
Sample
Point ·
Kristar Insert . 14--------
lnfluent
Sample
Point
Figure 1. Schematic of the Test System
4
iii > 0 E (I) a:
80
1st 2nd
test test 3rd test
< >< >~----------------~
~OOO O: C
········~ ·O 0
············ ·o················o···················:···················
0 : . O : . .
60 ····················,·•········· .. o ... i ...... 0 ........... \ ................... ~ .. .
40 ·······-·······························:-···················.·····--··-···--·-··:···· ·········-····
Sorbent = Fossil Filter
Flow= 15 GPM .
Influent= 33 -38 mg/L O&G I
20 ················ ...... ·•· ............... ·. . . . . . . . . -. . . . . . -. -. . . ~ ........... -. . . . . . . .. . . . . . . . . . . . .. -. . . -.
: Flo-Gard™ ln~ert with Xsorb
0 -11-'--J__--'---'----+--'---'-----'---'---;-'---'--...,___--'---.---'----'----'----'----r-'--.......__..__~-;
0 50 100 150 200 250
nme (min)
Figure 2. Oil and grease removal efficiency versus time.
5
cu > 0 E Q)
~
~
1st 2nd
test test 3rd test < ►< >~----------------~►
-~ IS) I : •
CS] (SJ --.,_. (SJ . :---; . : -_: •
. . . ~ ISl
60 -. --. --------·-----:---------------& --: --· -· · :sr· --······ -:-·· --· -· · · · · · ·--· ·· ·:· · · · .-:--. -:-:--:-:-. _.,. __ · · ·
40 .....
_......_ High Capacity
-&-Normal Capacity
··················:··············· .... ; ...... ····•·· ..... . . .
. .
20 ········ ...... ··········· ..... . . ... . -:·•· ..... . ; . -.. -... : ........ -. ~ .... -......... -.. .
0 ~--'---'------'----'----"--''--"--..J..._-l,____;1;...._-'--'---'--_,___,___.___,______J___;L__..---...L.--'--'---'----l
0 50 100 150 200 250
Time (min)
6
Figure 3. Oil and Grease Removal Efficiency for High Capacity and Normal Capacity
FloGard Filters versus time.
7
.. ".
...
ca > 0
E
G) a.:
~ 0
100 -r---ttt-,,:~~~~--------:--------------"7 ~-:.~,
\ .
80
60
40
20
............... ················•·· \\ .; .............•...............................
: \' \ : : : \' . : : \ : .
: 1' '. • 15 GPM (65 mg/L SS)
. ' ............................. : . ' .... _\' •.... ·\ '.: .... . : , , . -e-25 GPM (65 mg/L SS)
\ ' \ .
\'-. •:-, !\, · ·0· · 15 GPM (100 mg/L SS)
............ -. --;· ............. -. : .... ' ... -·\ ·'·,·. ·j· .... \ . .-.. -..... : ·. -...... -..... ·[· ......... -.... .
\ I '.
\ I' '\
.-<"' \ \'\ ·:·-.' \\ :
' ' \: '
............... : .............. ;. ....... ' ... ~ ........ ~., .... ~, ............... : ............... .
: '. '.---·-&_ :
: Q, ~~ : : : ' ,., ' :
: : ' '"'"" : ' ' ... '.,, : : ' . ·.,, \ .
0 : -~ -+------,----------,-,----~, ------------
20 30 40 60 100
(833-2000 um) (589-833 um) (420-589 um) (250-420 um) (149-250 um)
Mesh No.
(particles size)
Figure 4. Sand Particle Removal Efficiency versus time
8
BERKELEY• DAVIS• IRVINE• LOS ANGELES• RIVERSIDE • SANDIEOO • SANFRANClSCO SANT A BARBARA • SANT A CRUZ
June 22, 2001
Mr. Doug Allard
KriStar Enterprises Inc.
P.O. Box 7352
Santa Rosa, CA 95407-0352
Michael K. Stenstrom, Ph.D., P.E., Professor
Department Of Civil And Environmental Engineering
4173 Engineering I, Box 951596
Los Angeles, Ca 90095-1593
Phone: (310) 825-1408
Fax: (310) 206-5476
Email: stenstro@seas. ucla. edu
Subject: FloGard High Capacity Catch Basin Insert Test Results
Dear Mr. Allard
This letter and attached graphs and figures serves as our preliminary report to you for the
testing we performed using your FloGard High Capacity Catch Basin Insert. This letter
reports the results for oil and grease and sand particles (e.g., suspended solids) removal.
We will be providing a later report that describes the additional testing (using material
collected from the field and other devices).
We performed the tests in the same laboratory set up that we used in the earlier studies,
including the original study performed for the City of Santa Monica and the Santa
Monica Bay Restoration Project. The test was performed in a full-scale mock catch
basin. It is constructed of plywood and includes a stilling chamber, a 10-foot long by 24-
inch wide flume (to simulate street surface) and 36-inch wide catch basin. The entire
system is above grade to allow easy access and monitoring. The catch basin has an open
top that allows easy installation of a variety of inserts.
Figure 1 is a schematic of the test configuration. Tap water is metered into the system at
a known and constant flow rate. High flow rates were measured using a Doppler effect
velocity meter, which measures the velocity of particles contained in the tap water. We
injected small amounts of compressed air to simulate particles. Lower flow rates were
measured with a paddle wheel meter. From here the flow continues to a stilling basin
that allows the pressure and velocity to decrease and dampen. The water then flows by
gravity through a flume to the catch basin. The contaminants are then released into the
flume where the flowing conditions provide adequate mixing. Water flows down the
flume and into the catch basin. For these experiments, the entire flow entered the catch
basin through the insert; no flow was bypassed.
Oil and Grease Removal Tests
Tests were generally performed for 30 minutes. The contaminants were added in the
flume, which provided mixing. Used crankcase lubricating oil (from auto{llobiles) was
used as the oil and grease source. Influent oil and grease samples were collected as the
oil/water combination flowed into the insert. Effluent samples were collected by
capturing flow from the bottom of the insert. Samples were measured using our modified
oil and grease procedure. Efficiencies were calculated by subtracting the measured
effluent concentrations from the average influent concentration. All tests were performed
at constant flow rate.
Three oil and grease removal experiments were performed. The first lasted 30 minutes.
After the test conclusion, the samples were analyzed and the insert and sorbent were
allowed to dry. The second test was performed using the same sorbent, two days later.
Removal efficiencies were high and we decided to run the third experiment for 180
minutes. We allowed the sorbent to dry as before. We call this a sequential test. It is
performed over a sufficiently long period to show declining removal efficiency. We have
performed shorter tests in the past, and these are sometimes done to determine differences
in sorbent types or insert configuration.
Figure 2 shows the oil and grease removal rate. The initial efficiency is slightly greater
than 80%. After 240 minutes, the efficiency declined to approximately 76%. The
decline is typical and represents partial saturation of the sorbent material. The removed
oil and grease is easily observed on the sorbent material, as a black film.
Sand Particle Removal Tests
Sand particles were prepared by sieving sands from various sources, but mostly from
sand used for concrete construction. A series of ASTM standard sieves were used.
Particles were selected to demonstrate removal efficiency, as opposed to simulate
particles found in stormwater. The FloGard contains a woven nylon screen that
resembles a window fly screen. The screen has 8 pairs of filaments per centimeter, and
the openings between filaments is approximately 400 by 600 microns (µm). Sieve sizes
of 20, 30, 40, 60 and 100 were selected, which produce particles from 149 to 2,000 µm.
Equal, known masses of each sand particle size were released into the flume over a 3 0-
minute test. The particles flowed to the insert. Below the insert, a fine screen,
corresponding to 325-mesh, captured the particles not removed by the insert. At the end
of the test, the 325-mesh screen was removed and the retained sand particles were
collected, dried, sieved and weighed. The weight of recovered particles in each sieve size
was compared to the amount of sand released into the flume to calculate efficiency. As
2
expected the large particles were removed well, while the smaller particles were removed
poorly. The smallest sand particles are smaller than the mesh openings.
Three sand removal tests were performed. One was performed at 25 gallons per minute
(GPM) and two were performed at 15 GPM. Sand was added to create influent
concentrations equal to 65 to 100 mg/L. Figure 3 shows the results of three sand removal
tests. Figure 3 also shows the sizes corresponding to the sieve sizes. There is a range
because the sand retained on a sieve varies in size between that retained on the lower
screen and the size of the material passed by the upper screen.
The larger particles are completely removed by the screen. The 40 mesh particles are
very close to the size of the screen openings, which may explain the variability in test
results. For this particle size, random effects, such as the shape of the sand particles or the
angle they impinge the screen, may be influence removal rate.
Our tests were.all performed without trash and debris. Therefore there was little or no
clogging of the liner, which means that virtually all the water flows through the bottom
20% or so of the liner surface area. No increase in head loss was observed during these
tests.
I will transmit these and other findings to you in a report soon after we finish the other
testing. I understand that you will show this letter to your potential customers. I ask that
you show them the entire letter and graphs in order for them to appreciate the results as
well as the limits of the work.
I look forward to working with you on future evaluations.
Very truly yours,
Michael K. Stenstrom, Ph.D., P.E.
Professor
3
Air Injection
Point ,
I I
3 in. Tap water line. l
i
-I Stilling
Chamber
I !
Control Valve
11s.01 •
(~.' ,,-----c:=:J ( [-----------
(-~ 111.s I
\ ..
/... .
\ ,,' .. __ ,,..
Doppler Effect
Flow Meter
Paddle Wheel
Flow Meter
(,-,,,
Contami~ant 1-----1 itdi
Reservoir _J !!letering
Effluent
Sample
Point
Kristar Insert
I I l _____ ,
Figure 1. Schematic of the Test System
4
Pump
Influent
Sample
Point
► a,
E
:::J -LL
a,
"C ·-3:
..c: u
C:
--=t' N
1st 2nd
test test 3rd test
< ►< ►~---------------~►
. 0 ooo 60 .
0 : 0 0 : : 80 ...... Oo· · i';'.0:0•.<.· · · · · .·~--· ·~· · · · · · · · · · · · · · · · · · · · -· · · · · · · · ·. o. · · · · ..................... .
\;I O ·---·--·--·,-: 0
O 0
0 0
60 ················· .. , ............. ······: ....... ········ ····:················· ··;····•··············
Ii, • ' • • . . . . . . . . . . . . . . . . . . . . . . : : : 40 ························ ................................ ·:········• ........... ; .................. .
Sorbent = Fossil Filter : :
Flow= 15 :GPM : :
2: .... 1nfiu•nt ~ r~ 29 mg~ Q&G .............•................. r ............... · 1
. 0 50 100 150 200 250
Time (min)
Figure 2. Oil and grease removal efficiency versus time.
5
. .
iv > 0 E ~
120 ~------------------------
-e--15 GPM (65 mg/L SS)
100 ········:······~~·~·~~-·········
-ffi-25 GPM (65 mg/L SS)
· -•."> · · 15 GPM (100 mg/L SS)
80 ····························-····:····· ·········•····•······-····•·;·-····· .. ························· . . . . ' . . . ' . . .
I • • ' : I : ,
60 ················•··············· : .... \ ..... , ...............•............... ,.,.. ...... .
: : \\ : : : : : \ : : : : . \ \ : : :
\ \\ : : :
4 : \ : ' : 0 ............... ·'· -.................... -.. -. -.. \. ·'· ............... : ........ -.. -.. -·'· .............. .
: I \ \' I :
: \\ .. : . ' .
: : ·----: ' ,, ' : \ : ·,, :
. ~ .... , ... ,,~. :
20 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · : · : "· ~-· · · ~-•. · · · · · · · · · · · · · · ·: · · · · · · ·, · · · · · -· · '--s:, . ~\., :
'· : '•·, : "-. 0 -4----~---~---~----+----0.----~
20 30 40 60 100
(833-2000 um) (589-833 um) (420-589 um) (250420 um) (149-250 um)
Mesh No.
(particles size)
Figure 3. Sand Particle Removal Efficiency
6
A SUMMARY OF TESTS OF FOSSIL FILTER™ AND OF FOSSIL ROCK™
This document summarizes tests and evaluations that have been conducted on various models of
Fossil Filter™ Hydrocarbon catch basin inserts and Fossil Rock™, its installed adsorbent. The
purpose of this document is to capsulize the pertinent parts of several lengthy documents into one
document. The tests were performed by the cited engineering firms and laboratories.
HYDRAULIC TESTING OF FOSSIL FILTER™
1. Hydraulic Tests By Sandine Engineering: Hydraulic Testing of two types of Fossil Filter™
drain inserts, as observed by David L. Sandine, PE, of Santa Rosa CA. was conducted on May 22,
1995. Filters tested were installed in an asphalt-paved parking lot at the Petaluma (CA) Marina.
Flat Grated Drop Inlet:
The first tests were conducted using a single stage Fossil Filter™ system installed in a flat grated
drain inlet with an inside dimension of 27" x 27". The installed square filter had total filter length
of approximately 96" (8 linear feet). It incorporated an open high-flow bypass in the center of
approximately 16" x 16". The test was conducted using a 450 GPM (1 CFS) flow rate to
determine if the Fossil Filter would reduce the drainage inlet's hydraulic capacity.
Results: A 450 GPM (1 CFS) flow rate showed no apparent restriction in flow. Equipment
was not available to test flows greater than 1 CFS but it was apparent that the Fossil
Filter™ could have bandied a greater flow without overflow.
Curb Inlet:
The second set of tests involved a Fossil Filter™ installed in a curb inlet (City of Petaluma Type
A-1) at the Petaluma Marina. The inlet had a curb opening of 48" (4 linear feet) and an opening
height of 5". The curbs were CAL TRANS standard A2-6. A dual stage Fossil Filter™, 48" in
length (total filter area of 96" or 8 linear feet), was installed across and below the curb opening.
Two tests were performed.
The first test, using a water truck, directed the flow from one side at a low rate and increased until
the flow exceeded the capability of the filter and overflowed the weir of the first (upper) stage.
At that point the depth of flow in the gutter measured about 1 1/8" and, given the depth of flow
and the slope of the gutter, the filtering capacity of a single stage Fossil Filter™was
approximately 46 GPM.
The second test was conducted on the same filter using a metered fire hose attached to a fire
hydrant. The test commenced with low velocity flows similar to those encountered at the
beginning of a rain event (first flush) and then increased until overflow of the upper and then the
lower stages occurred.
Results: The dual stage Fossil Filter™ installed in the curb opening inlet effectively filtered
a flow rate up to 45 GPM.before any bypas., of the upper stage occurred and 92 GPM
before bypass of the lower stage.
Conclusions: These tests confirmed that the Fossil Filter™ system of catch basin filtration i1
an effective method of filtering stormwater runoff during initial and low flows. Further,
because of the bypass area designed into the Fossil Filter™, it will not restrict the inlet's
capacity even under high rates of flow -even if the Fossil FilterTM itself becomes clogged.
1
Page 2 -Summary of Testing
2. Hydraulic Tests by Eagle Engineering: On June 4, 1998, as part of a City of Sacramento
Stormwater Monitoring program, tests were conducted by consulting engineer Robert E. Burke of
Eagle Engineering of Sacramento. The tests involved two Fossil Filter™ drop-in units in a paved
yard ofTenco Tractor in West Sacramento.
Site #1 involved a square 24" x 24" drop inlet with a square steel grate mounting a square Fossil
Filter™ (Model FF2424H) with a net length of filter of 76" (6.3'). The ~nufacturer rated the
Filter at 12 GPM per linear foot of filter.
Site #2 involved a round drop inlet (24" diameter) with a circular cast iron grate and mounts a
round Fossil Filter (model RF24) with a net length of filter of 47" (3.9').
The test methodology was to feed metered water from a fire hydrant through a 1 1/2" fire hose to
the two sites. A flow rate equivalent to the rated capacity of the filters was established and the
performance of the filters observed and then the flow rate was increased to the maximum and,
again, the performance of the filters observed.
Observation disclosed that, at the manufacturer rated capacity of 12 GPM per linear foot, both
filters flowed freely without backup or overflow; however, at the round inlet, some water flowed
along the bars of the grate into the inlet center bypassing the filter. At the maximum available
flow (approximately 100 GPM), the square filter flowed freely without backup; however, the
velocity of the water, as it struck the grate, caused some splashing with localized overflow of the
filter's inner baffle. The round filter also flowed freely without backup; however, an estimated
15% of the water flowed along the bars of the grate to the center and bypassed the filter. With the
grate removed, and the entire flow entering the filter, the flow exceeded the filter's capacity and
the water overflowed the inner baffle.
In summary, both filters performed satisfactorily at their rated capacity of 12 GPM per linear foot
of filter without backup or overflow. At maximum available flow (125% of rated capacity), the
square unit was still operating well below ultimate capacity. The round unit, at a flow rate of 100
GPM (208% of rated capacity), was overwhelmed and water overflowed the inner baffle.
Cooclusiom: The tests demomtrated that Fossil Filters™ could accommodate flows well in
exces., of those claimed by the manufacturer. Wrth proper design and imtallation of the
inlet structure, the filters will accommodate flows well in excess of the manufacturer rating.
LABORATORY TESTING OF FOSSIL ROCK™ ADSORBENT
1. Pmm Laboratory Tests: On November 28, 1995, Prism Laboratories of Charlotte, NC
performed TCLP (Toxicity Characteristic Leaching Procedure) of Fossil Rock™, the adsorbent
installed in Fossil Filters™.
Under laboratory conditions, testing was conducted with two [one] liter containers of water into
which 50 drops of waster oil had been deposited. Liter A was tested for Method SW-846 #9070.
Liter B was filtered through 10 grams of Fossil Rock™ and then used for TCLP testing.
Results: Fossil Rock™ from Liter A retained 98o/o of the waste oil TCLP testing after Liter
B was filtered disclosed trace amoonts of~ selenium, cadmium, chromium lead,
silver, mercury and barium at levels far below the EPA limits.
2
2. Entech Lab Tests: In May 1996, Entech Analytical Labs, Inc. of Sunnyvale CA conducted a
lengthy series of tests of Fossil Rock™. An analytical summary of the test results is as follows:
Low Level Contamination High Level Contamination
Constituent A(J_er Treatment %Removal A(J_er Treatment %Removal
Antimony 0.075 25% 9.55 4.5%
Arsenic 0.029 71% 9.57 4.3%
Barium 0.115 None 10.29 None
Beryllium 0.102 None 10.45 None
Cadmium 0.102 None 10.1 None
Chromium 0.094 6.0% 10.65 None
Cobalt 0.101 None 10.16 None
Copper 0.105 None 9.56 4.4%
Lead 0.097 3.0% 9.87 1.3%
Mercury 0.010 0 0.0047 99.5%
Molybdenum 0.061 39.0% 9.2 8.0%
Nickel 0.101 None 9.98 0.2%
Selenium 0.119 None 11 .21 None
Silver 0.088 12.0% 6.21 37.9%
Thallium 0.016 84.0% 10.79 None
Vanadium 0.094 6.0% 9.95 0.5%
Zinc 0.179 None 10.23 None
Oil & Grease 3.6 55 .0% 46.4 53.6%
Motor Oil 0.052 94.8% 0.78 99.2%
Diesel 0.014 98.6% 0.63 99.4%
Gasoline 0.441 55.9% 34.8 65.2%
3. Fossil Rock™ Characterization Project by Entech Labs, Inc. of Sunnyvale CA
Objective: Determine the ability of Fossil Rock TM to remove varying levels of a wide range of
contaminants commonly found in industrial storm water discharges.
Scope: Testing was conducted at High and Low relative concentrations for the following sets of
contaminants: Diesel, Motor Oil, Gasoline, Oil & Greases and Heavy Metals.
Results: (In % removal of contamination) are slllllDl8li7.ed in the table below:
Contlllminants Low Level Concentration High level Concentration
Heavy Metals No Simificant Change No Siimificant Cha.nee
Gasoline 55.9% 65.2%
Diesel 98.6% 99.4%
Motor Oil 94.8% 99.2%
Oil & Grease 55.0% 53.6%
Conclusions: Based on the above testing:
1. Fossil Rock™ absorbs virtually all Diesel and Motor Oil present in water as it flows
through the material..
2. Fossil Rock™ absorbs more than 50o/o of the Gasoline present in water as it flows
through the material.
3. Fossil Rock™ does not absorb significant amounts of Heavy Metals or Non-Petroleum
based OU & Grease as it flows through the material
3
AMBIENT ENGINEERING EVALUATION OF FOSSIL FILTER™
In June and July of 1997, Ambient Engineering of Weymouth MA conducted a limited evaluation
of Fossil Filters™ installed in catch basins on public streets. Influent samples were taken by
diverting a portion of the stormwater entering the Fossil Filter™ to a sample container.
Additional sample containers were attached below the filter to collect stormwater that had passed
through the filter. Both influent and effluent samples were taken from either side of the storm
drain. A total of four influent and four effluent samples were composited to produce an average
influent and effluent for analyses. Each sample was analyzed for oil and gr~e, nitrate, nitrite,
total Kjeldahl nitrogen (TKN), total phosphorous, and total suspended solids (fSS).
Results: The study report indicates that "The oil and grease concentration appears to have
been reduced by the Fossil Filter. Since the Fossil Filter is designed primarily for oil and
grease removal, these results are consistent with expectations." The report also notes that a
determination of stamtical significance of the other pollutants " ... can not be made nsing
two sampling results ... Therefore, no removal of these pollutants by the Fossil Filter can be
confirmed."
SACRAMENTO STORMWATER MONITORING PROGRAM
During a rain event on March 7, 1998, representatives of Larry Walker and Associates, an
engineering firm, took samples from an installed Fossil Filter™ as part of the Sacramento
Stormwater Monitoring Program. The Fossil Filter™ was installed at the Laguna Village/United
Artists Theater site. A total of five samples were taken at the Fossil FilterTM inlet and five at the
outlet. The tests were for total petroleum hydrocarbons, total recoverable metals, dissolved
metals, total suspended solids, diaz.anon/chlorpyrifos. The rainfall intensity and flows at the time
were: Mean flow: 2 GPM, Median Flow: 0.4 GPM and peak flow 4 GPM. The rain
measurements were taken at approximately 20 minute intervals.
Results: According to the Monitoring Program report, the Fossil Filter™ removed the
following contaminants in the indicated percentages:
Total Recoverable Lead 33%
Dissolved Lead 11 %
Total Recoverable Copper 8%
Dissolved Copper -7%
Total Recoverable Zinc 17%
Dissolved Zinc -7%
Total Supended Solids 60%
DiaDnoo -26%
Chlorpyrifos 17%
Total Petroleum Hydrocarbons 46%
(Rev. 03/01)
4
Entech Analytical Labs, Inc. . CAEIAPrn,,
52S Del Rey Avenue, ·suite E • Sunnyvale, CA 94086 • (408) 735-15$0 • Fax (408) 735-15S4
FOSSIL ROCK Cbaracterintion Projcd
OBJECTIVE: Determine the ability ofFOSSIL &oCK to i-emove vuying ~ of a wide rang~ of
COD13ariaaot, OODl'DOA1y fixmd in Jadu,aial !ilonD water di.,charges__
SCOPE: Te$tiag 'WQ oonduotccl ■t Higb m Low relative~ 1ir die foilowinc KU of
coallll'fflDIAU:
• Dicld
• MotarOil
• C.1oliae
• OD & Gffllse
• HeaYy'M~
l'BOCEDUllE: See Attadunent for smmnary of filtration aad ualyticalpreccdures
L <Xdlc 11 melllllelted., ArMaic. Mawry..STbaUbamw qafflcan& chaDpl ( ~)ftllinllaDdardvalGCS\dcre
Pralim. ke.AaacbmcDrfar•-••,pcltwlytiallnAlla
2. Tiu~ ii --liblr due to abccptiou clldolllC Oil by FOSli.l aoctas .-tandatd ~ is 50%Mal&W Oil and SO% VcpeaHeOU .
CONCUJSIONS: .
1. Buecl Gil die above tatma Fonil lloc:k abaod,1 vimwly .U. Dietel aul Mlotor Oil present m. water as it
ilowa duvag1l the m,tc:da) .
2. Basecl oa the above testing Foail lwck ablosba ~ 1hlll 50-/4 of~ (moHae ,~ iD 'Wiler u it
.flows dna,11. tile material. . .
3.. Bad Oil die above tatiag Foail Jlock does not abcc,rtl Fipiftrot UDCJUII orHeavY Mc;tals Ot Non-
pdroleam ba,ed Oil & Grea• u ia flows tluoogh tile matori,l
Environmental Analysis Since 1983
_Entech Analytical Labs, Inc. CA ELAPJ 1369
525 Del Rey Avenue, Suite E • Sunnyvale, CA 94086 • (408) 735.1 SSO • Fax (408) 735• 15S4
SlJMMAllY OF ANALYTICAL l'ROCDnnu:s AND,a:ESULTS
Fonll Rock Tating
4 Oil &·Grease 4.0 ppm. Veptablo Oil+ SO ppm \legotab~ Oil+
4.0 Motor Oil SO 1'.iPl;:.;IOr=-.;Oil;.;,;,;,_ __ -'
1. Suitabkvommn f.or lbe lDllylil of eadl of'the above conlerniamb wen filteffd through
·,ppxouzmtoly 100 ~ of wp FOND llock. .
2. 1ho .tiJuation applJtatus waa tet up lo doaely ruemblc the CADdirioo1 of'ivaier flowing tbJougb. a Fonil
Kock•~ .ill a storm~ C.oatammlDf eoluliaoa ~c filtered id 1ho above order to mininriu
the potmlal for Q'OSS ~amiuti,on.
3. Separate 100 grun pOl1iolls offo,pl B.ock. ~ used for the Low LeveJ and High Level
CulceatntioApioc<· • .;,.,g
4. the SCIDdud soJudoD.s were wDeccect m suitable ~•mere afleJ filb'atiop. md IIDa\Jm for each of the
above oou!•minants was pedinn!NI: miag approvod method.I per EPA puJ,Jicatioa SW-846 u well as
· C-tHfimril·Tllle 22 (F.aviro.Dmemal Hea1dl aud Safi,ty) reqabamnta.
S. &tec;h~-11.abs, Ine. u certmect t,ytlle State of California Depanb:M:m ofHealdl Selviccs
(Ccrtific:ate #1369) to pafosw Ill of the above teltiag.
Environmental AnalySis Since 1981
HYDRAULIC TESTING
Tests were conducted by consulting Civil Engineer and Hydrologist Mr. David Sandine of Sandine &
Associates to determine maximum filtration rates and flow impediment during high flows using the
Fossil FIiter-system. Installations and tests were conducted at the Petaluma Marina in Petaluma,
California.
INSTALLATION 1 (FLAT GRATED DRAIN INLET):
Single stage Fossil Filter-system installed into a flat grated drain inlet with an inside dimension of
21· x 2r. The installed square filter had total filter length of approximately gs• (8 linear feet) and, after
installation, left an open area high-flow bypass in the center of approximately 1s· x 1a·.
INSTALLATION 2 (CURB INLET):
Dual stage Fossil Filter-system installed in a City of Petaluma standard curb opening inlet with a
curb opening width of 48• (4 linear feet). Two 48. (4 linear feet) straight filter rail sections were used,
totaling gs• filter length (8 linear feet).
TEST1
The first tests were conducted using a 450 GPM (1 CFS) flow rate to determine if the Fossil F//ter-
would reduce the drainage inlet's hydraulic capacity in either of the above outlined installations.
Results: A 450 GPM (1 CFS) flow rate showed no apparent restriction in flow. Equipment was not
available to test assumed design hydraulic capacities greater than 1 CFS but it was apparent that the
Fossil Filter-could have handled a greater flow rate without overflow.
TEST2
The second set of tests were conducted on the dual stage curb opening installation (installation 2
above), using a metered fire hydrant to determine the flow rate at which overflow of both stages of the
Fossil Filter-would occur. The tests commenced with low velocity flows similar to those
encountered at the beginning of a rain event and then increased until overflow of the upper and then
the lower stages occurred.
Results: The dual stage Fossil Filter-installed in the curb opening inlet effectively filtered a flow rate
up to 45 GPM before any bypass of the upper stage began at 92 GPM before bypass of the lower stage
be an.
CONCLUSIONS
These tests confirmed that the Fossil F//terTM system is an effective method of filtering stormwater
runoff during initial and low flows. Further, because of the bypass area designed into the Fossil
FifterTM, it will not restrict inlet capacity under high rate of flow -even if the Fossil Filter TM itself
becomes clogged.
(Rev. 10/00)
04-14-98
HYDRAULIC TESTING
On June 4, 1998, tests were conducted by consulting civil engineer Robert E. Burke of Eagle
Engineering of Sacramento to demonstrate the actual hydraulic capacity of operating filters. The
tests were conducted as a follow-on to the test program of the City of Sacramento entitled
"Sacramento Stormwater Monitoring Program; NDMP Stormwater Control Measure Study".
The tests were conducted on two Fossil Filter drop-in units in the paved yard ofTenco Tractor in
West Sacramento.
Site #1:A square (24" x 24") drop inlet with a square welded steel grate mounting a square Fossil
Filter (Model FF2424H) with a net length of the filter elements of 76" (6.3'). The manufacturer
rates the capacity of Fossil Filters as 12 GPM per linear foot of filter element. The
manufacturer's rated capacity of the FF2424H filter is given by the formula 12 GPM x 6.3 LF =
76GPM.
Site #2: A round drop inlet (24" diameter) with a circular cast iron grate and mounts a round
Fossil Filter (Model RF24) with a net length of filter element of 47" (3.9'). The manufacturer's
rated capacity of the RF24 filter is given by the formula 12 GPM x 3.9 LF = 47 GPM.
TEST METHODOLOGY: Water from a fire hydrant was metered and fed to the sites through a
l ½" fire hose. A flow rate equivalent to the rated capacity of the filters was established and the
performance of the filters observed. The flow rate was then increased to the maximum flow of
the hydrant and the performance of the filters observed.
OBSERVATIONS: At the manufacturer's rated capacity of 12 GPM/LF of filter, both filters
flowed freely without backup or overflow; however, at the round inlet (Site #2), some water
flowed along the bars of the grate into the inlet center and bypassed the filter.
At the maximum available flow (approximately 100 GPM), the square filter flowed freely without
backup; however, the velocity of the water as it struck the grate caused some splashing with
localized overflow of the filter's inner baffle. The round filter also flowed freely without backup;
however, an estimated 15% of the water flowed along the bars of the grate to the center and
bypassed the filter. With the grate removed and the entire flow entering the filter, the flow
exceeded the filter's capacity and the water overflowed the inner baffle.
To recap, both Fossil Filters performed satisfactorily at their rated capacity of 12 GPM/LF
without backup or overflow. At maximum available flow (125% of rated capacity), the square
unit was still operating well below ultimate capacity. The round unit, at a flow rate of 100 GPM
(208% of capacity), was overwhelmed and the water overflowed the inner baffle.
CONCLUSIONS: The tests demonstrated that Fossil Filters can accommodate flows claimed by
the manufacturer. With proper design and installation of the inlet structure, the filters will
accommodate flows well in.excess of the manufacturer's rating.
FILTRATION CAPACITY
Charts shown below reflect the effectively filtered hydraulic flow capacity of both rectangular grated inlets and
curb inlets of various sizes.
The data shown on the charts is based on the hydraulic testing performed by Sandine & Associates (see
attached letters). Testing ~ shown that a flow rate of 12 GPM per linear foot of Fossil Filte,,,,. is effectively
filtered by the installed Fossil Rock"" filter media.
HYDRAULIC CAPACITY CHART
Rectangular Grated Inlet Application
200 ································ .. 1 ................................... T .................................... , ................................. ,. ................................... T' ................................... r ··································!,····································. ; ; } . . .
180 ······ ··· ······ · · ······ ... t,,. ·· ··· ····· ··· ···· ······+······ ·· ······· ·· · ··············· ········· l j : \ ; .
160 ·········· .... ····················;···································t························· ·······r-· ···•·····i••···································i····································;······
140 ...... .. ........... ········+············· ........ ··········t·· ········· ................ ·t········ . ····· ....... ·········r ......... ................. ··i. ··············· .......... ·r···· .. ········ ···············( ... ········ ............ :
120 ·································l····································t.································ ! : ' , G l ~ 1 :
P 100 ·································· '...... . .................... .; ................................... ~ ................................... ; ..................................... ; ............................. ·····•·····································:···································'
M 80 ............................. ····l············· .. ......... j... ................. \····································i·································•i••··································'····································l ······················"········-
60 ····················· ; ; , : l ........... ·······················;··························
40 ············ ............... ; ............................... ····· : .............. .. . ........................ •··•· ...... ... ... . ........... ~--.......................... . .·········· ............................... ·····•··················
······'.·············· ... ·················••: .. , ............ .
24"x24" 24"x30" 24"x36" 30"x30" 24"x48" 36"x36" 36"x48"
INLET DIMENSION
HYDRAULIC CAPACITY CHART
Curb Inlet Application
250 i . ~ ~ ~ ~ [ .
200 ·····················l························•·······················1···············l···················· I·······················'· ............. : ...................... !
! ::: ·•••••••••••••••••••••I••••••••••••••••••••••···••••••••••••••••••:•••••••••••••••••i•••·····•••••••••••••••r•••••••••••••••••••••1••••••••••••••••••••••r••••••••••••••••••••••1
so ··············· ·····t····················r······················L·················· l·······················l·······················r··················l······················l
0
0 KriStar Enterprises 419196
: : : : : : : :
36" 48" 60" 72" 84" 96" 108" 120"
CURB INLET SIZE
48"x48"
SANDINE & ASSOCIATES, INC.
March 29, 1996
CONSULTINGCIVILENGINF.ER.S
1100 SONOMA AVENUE, surm Al,
SANTA llOSA, CALlfORNIA, 95405
(707) 578-8383 PAX No. (707) 578-0209
Krista: Bnterpd.a ..
.&22 Larld1eld Center Ste. 271
Senta 1t0aa, CA 95.03-1'08
Re: Fo .. il Fil te.r
Fia.ld Testing
near Debra:
on May 22, 1995 I obMrved f:ield tasting of i.nstalled Foaaii
Filter• l.ocated at the Petaluaa MarJ.na i.n Petaluma, CA.
'J'eati.ng was conducted to detemine if the Foeai.l Fil'ter
reatx'1ot• flow fraa enter~ the draift89• inl•te.
(CU. 1)
The Fo••il Fil tar vu inataUed in • :tlat gra~ drop
inl.et with a grate cUwenaion of 27"&27". The J.na~led
t1l. ter left an unobatxueted ovarfl.ow ( bypa••) area o~
app~,·•i'aly 12•x12• in the center of the .inl.et
( Re:f. Dwg. l ) •
'feat were taken uiid•1· "F l.t&l.4 eoodi tJ.ona" in a paTIICI
perking lot with aoae •ilt, clirt and debris but I would
COll9i4er thia a clean teat.
The subject inlet vaa l.Oeat.4 in • nap COIM'liticn
all.owing all water to flow d.lreCtl.7 m tM ;rat..
UtJ.lizing a water truck, tbe inlet vu teated by aprarillO
water at full flow into ~ parking 101: ■urfaoa
aurrounding the inlet.
At a flov rate of 450 gal.loca per ld.mlta ( GPM) or 1 cubic
foot per-•eoond (Cl'S). tba Fo-il Filter clid not
~trict flow f1;oa en~inO 'the inlet. . .
. l would U8\IINI tha 4-1.gn capacity of tM ~ 27 .lncb
9qUare inlet to be o. 56 era using a deeign depth of 0.12
feet and assuaing only 'two sidu of the inlet •~fectJ.ft.
/ ltri•tar
March 29, 1996
Paga 2
'1"ha Fossi.l Fil tar did not r .. trict the inl.at fraa ... ting
.i.ta design hydraulic capacity.
C~•• 2)
A curb opening type oatch bu.in with e· "Dual Stage•
Fossil F1..l ter installed below al\d across tha curb opening
(Rat. owg. 2) was alao wste4.
·The curb inlet vaa a City of Petaluaa Standard A-1 inlet
wJ.th a curb opening w1.dth of ,a• and openf.ng h•ight of
approximately 5".
The curb i.nlet was located in a swap cond~ ti.on assuring
that all water reaohed the inl.et.
The curb inlet ns al•o teated utilizing a water tr\ldc
a-praying ot • full flow onto the parking lot eur~aca.
At a flow rate 650 GPM ( l CFS) the 1'08811 Ft.l ter di.d not
r .. n-ic;t f ).ow f"m entRr1 no 1".hA 1 nlet. *Though testing
eQUipaent did not allow for flows of 3 CSF, wtueh is the
aaaua&d design hydraulic capacity, it was apparent that
flows in excess of the l CS1' ~ted would not be iapeded
by the Fossil Filter.
Please do not hui tate to call 11e if you have any quastione.
-...
Davj,d X,.
SANDINE & ASSOCIATES,INC.
CONSUL TING CIVIl., ENGINEERS
1100 SONOMA A VENUE , SUITE A3 SANTA ROSA. CA 95405
(707) 578-8383 FAX No. (707) 578-0209
April 9, 1996
Debra Allard, President
KriStar Enterprises, Inc.
422 Lark.field Center, Suite 271
Santa Rosa, CA 95403-1408
Subject: Fossil Filter, Field Testing
On May 22, 1995, I observed field testing of a Fossil Filter Drain Insert installed in a
catch basin located at the Petaluma Marina, Petaluma, California. Hydraulic tests were
conducted to detennine the filtering capacity of the installed filter.
Testing was conducted on a curb inlet type inlet (City of Petaluma Type A-1). The curb
inlet had a curb opening of 4 '-0" and an opening height of approximately 5". The curbs
were CALTRANS standard A2-6. A dual stage Fossil Filter was installed across and
below the curb opening. (Ref. Fig. 1.)
The tested inlet was located in a sump condition assuring that all water reached the inlet.
The approach gutter slope was approximately one percent in both directions.
The first test was performed utilizing a water truck. Flow was introduced to the inlet
from one side at a low rate and increased until the water overflowed the weir of the filter
rail when filter capacity of the first stage was exceeded. At this point the depth of flow in
the gutter was measured at 1-1/8". Given the depth of flow and the slope of the gutter,
the filtering capacity of the single stage Fossil Filter was apprmdmately 46 GPM.
A second test was conducted on the same installed filter using a metered fire hose
attached to a fire hydrant. A flow rate of 45 GPM was observed prior to overflow of the
first stage filter and a rate of flow of 92 GPM was observed prior to overflow of the
second stage filter.
The results of these tests indicate a filter capacity of the dual stage Fossil Filter of 92
GPM. Given the total length of filter rail of the tested inlet as 8'0", the Fossil Filter
capacity can be expressed as 12 GPM per linear foot of filter rail. The filter rail did not
impede flow into the irilet when the flow exceeded the capacity of the filter.
The above testing was done under field conditions in a paved parking lot with some silt,
dirt and debris but I would consider this a clean test.
Please do not hesitate to ~all if you have any questions.
U.C.L.A. TESTS OF FOSSIL FILTER FLO-OARD IIlGH CAPACITY
CATCH BASIN INSERT, CONDUCTED IN OCTOBER 2000
TESTING PROTOCOL:
Tap water from a three inch water line wu mc:t«cd into the system at a constant rate of 15 gallons per
minute. The flow was regulated by a Doppler effect velocity meter, which measured the velocity of
particles contained in the tap water. Small amounts of compressed air were injected into the flow to
simulate particles. The water then flowed through a stilling basin which allowed the pressure and velocity
to decrease and dampen. The water then flowed by gravity through a 24 inch wide flume to the catch
basin. The contaminants (oil and grease) wa-c thm, by metering pump, released at a rate of 15 to 28 MG
per litu of w8tt'r into the flmne where the flowing conditioos provided adequate mixing. The water flowed
down the flume into the catch basin. The entire flow entered the catch basin through the insert: no flow
was bypassed. Influent samples "Mre collected in the water fiill from the flume into the insert. Effluent
samples were collected by passing a sample container below the tilter insert.
The testing process involved two tests, the first for Percent Ranoval of Oil and Grease and the sccmd for
Total Oil and Grease Absorbed.. Each of the two tests involved three sequmcc tests: The first wu 30
minutes in duratioo, the second was also 30 minuta in duration and the third was three hours in duration
for a total test-time of four hours.
TEST RESULTS:
PERCENT REMOVAL OF OIL AND GREASE IN THREE SEQUENCE TESTS
Fint ,eqaeace ol 31 ..... : The filta' ranoval beMeen 799/4 and 8..,./4 of the oil and grease with the
higher rate occurring in the first 15 minulm of the tat.
Secoad teqwe of 30 ala.._: The filter removed between 69-/4 and 89% of the oil and grease with the
higher rate occurring during the second half of the paiod.
nlrd teqaeace of~ lloan: The filter removed between 700/4 and 90'/4 of the oil and grease at a
uniform rate throughout the testing period.
TOTAL OIL AND GREASE ABSORBED IN THREE SEQUENCE TESTS: At the end of the:
Pint ,eqanee of 30 mballCel~ The amount of oil and grease absorbed totaled approximately 20,000 mg;
Secoad teq•■ce of 30 mi■IICel: The amount of oil and grease absorbed totaled approximately 65,000 mg;
nlrd Mqae■ce or tllree ltous: The amount of oil and grease absorbed totaled approximately 300,000 mg-
of oil and grease.
Note:
The above testing protocol for tests of the Fossil Filter Flo-Gard High Capacity catch basin insa1s was
developed, and the October 2000 tests performed, by Professor Michael Stenstrom of the University of
California at Los Angeles
Product Identification: Fossil Rock
Product Description: Selective Hydrophobic filter pack absorbent
L Manufacturer ldenti(icationl .. V._._R_e_a_c_ti_v,_·ty_D_a_ta _________ _
Manufacmrer~Name: Abzorbit Technology
Distributed By: Kri Star Enterprise.•. Inc.
Address: P.O. Box 7352 Santa Rosa, CA 95407
Emergency Telephone Number: 800-579-8819
Stability: Stable
Conditions to avoid: Hydrofluoric Acid
'lncompatability (Materials to A void): Hydrofluoric Acid
Hazardous Decomposition or By-Products: None
Hazardous Polymerization: Will not occur Telephone Number for Information: 'S.O 0.-5 7 9 -8 8 19
(above numbers active 8 am through 5 pm PSI) ----------------I VL Health Hazard Data I III. Ingredients/Identity Information I ... _ _.. _____________________ _. Route(s) ofF:ntry: Inhalation: Yes Skin: No. Ingestion: Yes
Date Prepared: 09-15-9S Health Hazards (Acute and Chronic}: None
Hazardous Components: None Signs and Symptoms of Exposure: lnnocuow do~
OS/I.A.: NA PEL: Smg/m3 ACGDI: NA Overexposure may cause coughing & sneezing
11..V: 1Smg/m3 om ER: NA Medical Conditions Generally Aggravated by Exposure:
Ill Physical I Chemical Characteristics
Boiling Point: SOLID
Vapor Pressure: (mm Hg): SOLID
Vapor Density: (AIR =/): SOLID
Solubility in Water: Insoluble in water & most acids
SpecificGravity: (H2O=/): .08-.20
Melting Point: 2400 degrees F
EvaporationRate: (ButylAcetate=l): NIL
Appearance and Odor: White powder, no odor
IV. Fire and Explosion Hazard Data
Flash Point: None
Flammable linits: Non-flammable LEL: None
UEL: None
Extinguishing Media: None if product unmed. If wed to
collect flammable liquids, then consult MSDS(s) of flam
mable liquid collected.
Specific Fire Fighting Procedures: None if product unwed.
If used to collect flammable liquid, then consult MSDS(s)
of flammable liquid collected. ·
Unusual Fire and Explosion Hazards: None if product
unused. If used to collect flammable liquid, then comult
MSDS(s) of flammable liquid collected.
Note: N/A = Not Applicable
Persons sensitive to inert dost may experience coughing
when exposed to heavy concentrations of airborne material
Emergency and First Aid Procedures: Breathe fresh air. If
dust lodges in eyes, use standard eye wash solutions or water
and allow eyes to clear. Consult with a physician.
I VIL Precautions for Safe Handling and Use I
Steps to be Taken inCase Material is Released or Spilled:
Sweep or vacuum and dispose of as for any inert.
non-carcinogenic solid waste.
Waste Disposal Method: If product unused, then llo
special disposal procedure necessary. After product
bas been used to collect liquid materials, dispose in
compliance with MSDS(s) of the liquid collected.
Precautions to be Taken in Handling and Storing: Avoid
emptying bags in windy areas
Other Precautions: None in unwed form. After prod-
uct has been used to collect liquid materials, consult
MSDS(s) of the liquid collected.
I VIIL Control Measures I
Respiratory Protection: Suitable for inert. Non-
Carcinogenic dusts: MSA Dostfoe 77 or equivalent.
Ventilation: Local Exhaust: Apply negative pressure air
at dump stations to entrain airborne dust.
Mechanical: Easily transported pneumatically
Special: NA Other: NA
Protective Gloves: Not Necessary
Eye Protection: Safety glasses/goggles
Other Protective Clothing or Equipment: Not necessary
Work/Hygienic Practices: Normal good housekeeping
The information on this Data Sheet represents our current data and best opinion as to the proper use in handling of this
material under normal conditions. Any use of the material which is not in conformance with this Data Sheet or which
involves using the material in combination with any other process is the responsibility of the user.
C KriStar Enterprises 1/1/96
r-IDSTAR ENTERPRISES, INC .
. TCLP Testing Results (Toxicity Characteristic Leaclung Procedure)
Lab Name: Prism Laboratories, Inc.
Charlotte, North Carolina
NC Certification No. 402
SC Certification No. 99012
NC Drinking Water Cert. No. 37735
Sample I.D.: AA40467
Customer Sample I.D.: FOSSIL ROCK
Sample Collection Date: 11-28-95
Lab Submittal Date: 11-06-95
Laboratory Director: Angela Overcash
Sample Contents: Waste Oil
Test Parameter Units"
TCl..P Extraction (Metals Only)
Metals Digestion Method 3010
Metals Digestion Method 3020
Multicomponent analysis: TCLP Metals
ARSENIC, Lcachable mg.IL
SELENIUM. Lcachable mg.IL
CADMIUM, Leachable mg.IL
CHROMIUM. Lcachable mg.IL
LEAD, v.acbabl~ mg.IL
SILVER, Lcacbable mg.IL
MERCURY, Lcachable mg.IL
BARIUM, Lcacbable mg.IL
• Unit of mc:uure: peiu per million
Test Result Det. Limit• E.P.A. Limit . N.C. Limit
Completed
Completed
Completed
Less than 0.50 5.0 0.50
.026 0.010 1.0 0.1
Less than 0.01 1.0 0.10
Less than 0.01 5.0 0.50
Less than 0.01 5.0 0.50
Less than 0.01 5.0 0.50
Less than 0.02 0.2 0.02
.91 .01 100.0 10.00
• Actual dc:tcc:tioo limit, tc:st results bucd upon
Explanation:. Testing was conducted with 2 liters of water both with 50 drops of waste
oil. LiterB was.filtered through 10 grams of FOSSIL ROCK Then LiterA was tested/or
method reference SW-846 #9070 (results below). FOSSIL ROCK after Liter B was
filtered was then used for TCLP testing (results above).
Sample LD.: AA40465
Customer LD.: Spiked Water
Sample CoUection Date: 11-28-95
Lab Submittal Date: 11-06-95
Method reference: SW-846 #9070
Detection Limit: 10
Be/ore Filtering (Liter A)
Result: 550 mg/I
Sample LD.: AA40466
Customer LD.: Filtered Spike
Sample Collection Date: 11-28-95
Lab Submittal Date: 11-06-95
Method Reference: SW-846 #9070
Detection Limit: 10
After Filtering (Liter BJ
Result: Less than
FOSSIL ROCK retained 98% of waste oil (50 drops of waste oil to 10 grams of FOSSIL ROCK.)
FILTER
BODY
FOSSIL ROCK
FILTER MEDIUM
FLOATS TO ALLOW
FOR MIGRATION
OF FINES (SILTS)
FLOWS
~
./??: ~ . ·'I'.,
. . . . . 41 . ., . . .
.. :r;2):A_• .. ·
.. . . . ... . . ...
TOP
SCREEN
BOTTOM
SCREEN
FILTRATION PROCESS DETAIL
NOTTO SCALE
APPENDIX4
Addendum to Preliminary Drainage S~udy
for
Lincoln Northpointe and Northpointe West
(50Acre Project Site)
I
ADDENDUM NO. 1
TO
PRELIMINARY DRAINAGE STUDY
FOR
LINCOLN NORTHPOINTE
· CT 98-07
June 10, 1998
J.N.: 97-1041
Prepared for: Lincoln Property Company
-30 Executive Park
Suite 100
Irvine, California 92613-9693
(714) 261-2100
Prepared by: O'Day Consultants. Inc .
2320 Camino Vida Roble
Suite B
Carlsbad, California 92009
(760) 931-7700
Purpose
The purpose of this addendum is as follows:
1) Respond to Engineering Department questions concerning pre.:.<Ievelopment and post-
development flows leaving the site at Corte de la Pina.
2) Respond to Engineering Department plan check comment concerning outlet conditions for
the existing 24" r.c.p. storm drain at El Camino Real Station 309+09.
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