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Best Management Practices for Chemical Treatment Systems for Construction Stormwater and Dewatering

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FHWA-WFL/TD-09-001
January 2009

Front Materials

report cover

 

Technical Report Documentation Page

1. Report No.
FHWA-WFL/TD-09-001
2. Government Accession No. 3. Recipient's Catalog No.
4. Title and Subtitle
Best Management Practices for Chemical Treatment Systems for Construction Stormwater and Dewatering
5. Report Date
January 2009
6. Performing Organization Code
7. Author(s)
Richard A. McLaughlin, Ph.D. and
Alex Zimmerman, CPESC
8. Performing Organization Report No.
9. Performing Organization Name and Address
North Carolina State University
101 Derieux Street, 2232 Williams Hall
Raleigh, NC 27695
10. Work Unit No. (TRAIS)
11. Contract or Grant No.
12. Sponsoring Agency Name and Address
Federal Highway Administration
Western Federal Lands Highway Division
610 East 5th St.
Vancouver, WA 98661
13. Type of Report and Period Covered
Final Report 2009
14. Sponsoring Agency Code
HFL-17
15. Supplementary Notes
COTR: Amit Armstrong, Ph.D., P.E.
This project was funded under the FHWA Federal Lands Highway Technology Deployment Initiatives and Partnership
Program (TDIPP) and Coordinated Technology Implementation Program (CTIP).
16. Abstract
Chemical treatment systems (CTS) are implemented in areas where traditional, physical erosion and sediment control practices will not meet water quality goals for construction site runoff. The purpose of CTS is to reduce the amount of suspended sediment which would be released using conventional erosion control systems. The primary mechanism is the introduction of chemical flocculants into runoff, resulting in a binding of the suspended clays and silts together into larger particles which settle more quickly or can be filtered from the stormwater. Flow control through CTS is of vital importance for the proper dosing of stormwater runoff. All normal hydrologic analyses must be done to insure that reasonable peak flows are accounted for along with typical flows from designed storm events. Once analysis is adequately addressed, then the project can deal with the complexities of design and dose rate requirements.
The overall objectives of this book are twofold. First, it is designed to provide a technically credible basis for best management practices for the use of CTS for turbidity reduction on road construction projects. Secondly, it is designed to identify the most important variables to address when selecting chemical treatment best management practices for a particular site.
17. Key Words
BEST MANAGEMENT PRACTICES, CHEMICAL
TREATMENT SYSTEMS, STORMWATER,
DEWATERING, WATER QUALITY, TURBIDITY
18. Distribution Statement
No restriction. This document is available to the public from the sponsoring agency at the website http://www.wfl.fhwa.dot.gov/td/.
19. Security Classif. (of this report)
Unclassified
20. Security Classif. (of this page)
Unclassified
21. No. of Pages
12
22. Price
$0.00

Form DOT F 1700.7 (8-72) Reproduction of completed page authorized

Table of Contents

SI* (MODERN METRIC) CONVERSION FACTORS
APPROXIMATE CONVERSIONS TO SI UNITS
Symbol When You Know Multiply By To Find Symbol
LENGTH
in inches 25.4 Millimeters mm
ft feet 0.305 Meters m
yd yards 0.914 Meters m
mi miles 1.61 Kilometers Km
AREA
in2 square inches 645.2 Square millimeters mm2
ft2 square feet 0.093 Square meters m2
yd2 square yard 0.836 Square meters m2
ac acres 0.405 Hectares ha
mi2 square miles 2.59 Square kilometers km2
VOLUME
fl oz fluid ounces 29.57 Milliliters mL
gal gallons 3.785 Liters L
ft3 cubic feet 0.028 cubic meters m3
yd3 cubic yards 0.765 cubic meters m3
NOTE: volumes greater than 1000 L shall be shown in m3
MASS
oz ounces 28.35 Grams g
lb pounds 0.454 Kilograms kg
T short tons (2000 lb) 0.907 megagrams (or "metric ton") Mg (or "t")
TEMPERATURE (exact degrees)
°F Fahrenheit 5 (F-32)/9
or (F-32)/1.8
Celsius °C
ILLUMINATION
fc foot-candles 10.76 Lux
lx
fl foot-Lamberts 3.426 candela/m2 cd/m2
FORCE and PRESSURE or STRESS
lbf poundforce 4.45 Newtons
N
lbf/in2 poundforce per square inch 6.89 Kilopascals kPa
APPROXIMATE CONVERSIONS FROM SI UNITS
Symbol When You Know Multiply By To Find Symbol
LENGTH
mm millimeters 0.039 Inches in
m meters 3.28 Feet ft
m meters 1.09 Yards yd
km kilometers 0.621 Miles mi
AREA
mm2 square millimeters 0.0016 square inches in2
m2 square meters 10.764 square feet ft2
m2 square meters 1.195 square yards yd2
ha Hectares 2.47 Acres ac
km2 square kilometers 0.386 square miles mi2
VOLUME
mL Milliliters 0.034 fluid ounces fl oz
L liters 0.264 Gallons gal
m3 cubic meters 35.314 cubic feet ft3
m3 cubic meters 1.307 cubic yards yd3
MASS
g grams 0.035 Ounces oz
kg kilograms 2.202 Pounds lb
Mg (or "t") megagrams (or "metric ton") 1.103 short tons (2000 lb) T
TEMPERATURE (exact degrees)
°C Celsius 1.8C+32 Fahrenheit °F
ILLUMINATION
lx lux 0.0929 foot-candles fc
cd/m2 candela/m2 0.2919 foot-Lamberts fl
FORCE and PRESSURE or STRESS
N newtons 0.225 Poundforce lbf

kPa
kilopascals 0.145 poundforce per square inch lbf/in2

Figures

Tables

List of Acronyms

BMPs - Best management practices

CTS - Chemical treatment systems

DADMAC - Diallyldimethyl ammonium chloride

EPA - Environmental Protection Agency

ESC - Erosion and sediment control

NPDES - National Pollutant Discharge Elimination System

NTU - Nephelometric Turbidity Unit

PAM - Polyacrylamide

SWPPP - Stormwater Pollution Prevention Plan

TSS - Total Suspended Solids

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