1000 20180718 Ariana Chong Concrete BMPs at small projects · 7/18/2018 · Microsoft PowerPoint -...
Transcript of 1000 20180718 Ariana Chong Concrete BMPs at small projects · 7/18/2018 · Microsoft PowerPoint -...
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July Construction Stormwater Quality WorkshopJuly 16–19, 2018
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Proper BMPs for Handling Concrete and Other Home Building Materialsat Small Construction Projects(Category 1A, 1B, and 2)Ariana Chong3rd Party Construction Inspector
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Introduction• Welcome• Introduction
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City and County of Honolulu July 2018 | Construction Stormwater Quality Workshops
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Understand why it is important to properly handle concrete washout water and other building materials Understand how to apply Best Management Practices (BMPs) at small construction sites Review Exercise
Learning Objectives
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City and County of Honolulu July 2018 | Construction Stormwater Quality Workshops
The City’s Storm Drain System Storm water runoff containing pollutants or illegal discharges can flow into the City’s storm drainage system, which routes storm water directly to streams and eventually to the ocean. Water in the storm drain system receives no treatment or filtering process and is completely separate from the City’s sewer system.
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City and County of Honolulu July 2018 | Construction Stormwater Quality Workshops
Discharges of pollutants into the storm drains end up in our streams and oceans
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City and County of Honolulu July 2018 | Construction Stormwater Quality Workshops
Concrete Washout Water - Overview
Concrete washout is the receptacle or containment. Concrete washout water is a slurry containing toxic metals. It’s corrosive due to high limestone content.
• pH near 12. In comparison, Drano liquid drain cleaner has a pH of 13.5.
Thin-set or drybond mortar, plaster, stucco, and grout.
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City and County of Honolulu July 2018 | Construction Stormwater Quality Workshops
Concrete Washout Water - Environmental & Human Health Impacts Corrosive washwater can harm fish gills and eyes and interfere with reproduction.
• The safe pH for aquatic life habitats ranges between 6.5 – 9 for freshwater and 6.5 – 8.5 for saltwater.
If dumped on the ground, run off from the site to adjoining roads and enter storm drains discharge to surface waters without any treatment migrate down into groundwater, and possiblyimpact drinking water supplies
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City and County of Honolulu July 2018 | Construction Stormwater Quality Workshops
Bottom line…
DO THE RIGHT THING TO TAKE CARE OF THE ENVIRONMENT
(It’s better for everyone, including yourself, in more ways than one!!!)
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City and County of Honolulu July 2018 | Construction Stormwater Quality Workshops
3rd Party Inspections - Critical Deficiencies August 2017 to May 2018
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13.01%12%
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City and County of Honolulu July 2018 | Construction Stormwater Quality Workshops
Top 10 Issues at Small Construction Projects1) Concrete wastes dumped directly on the ground2) Mortar, plaster, stucco, and grout dumped on the ground3) Uncontained leaks from truck chutes4) Uncontained leaks from pump trucks and extender hoses5) Concrete washout is not leak-proof (holes, cracks, unsealed)6) Unlined concrete washout pits7) Overflow spills (overfilling, missing containment, moving containment, splattering out)8) Uncontained saw-cutting slurry9) Leaving materials unprotected from rain and runoff10) Concrete washout water entering storm drains
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City and County of Honolulu July 2018 | Construction Stormwater Quality Workshops
1. Concrete wastes (washout or solids) dumped directly on the ground
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What’s the Difference?
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City and County of Honolulu July 2018 | Construction Stormwater Quality Workshops
2. Mortar, plaster, stucco, and grout dumped on the ground
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City and County of Honolulu July 2018 | Construction Stormwater Quality Workshops
3. Uncontained leaks from truck chutes
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City and County of Honolulu July 2018 | Construction Stormwater Quality Workshops
4. Uncontained leaks from concrete pumps and extender hoses
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City and County of Honolulu July 2018 | Construction Stormwater Quality Workshops
Who is Responsible for Providing Concrete Washouts? Whoever oversees the construction project
• Homeowner/builder• General Contractor
It is not the ready-mix concrete supplier• Tip: Look at your contract. Concrete washout requirements are
included in contracts with concrete delivery companies. Your ESCP contains specific BMPs for your project
• Install BMPs before project starts
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City and County of Honolulu July 2018 | Construction Stormwater Quality Workshops
Tip: Look at your contract. Concrete washout requirements are included in contracts with concrete delivery companies.
General Terms and Conditions of Concrete SalesThe customer agrees to provide an area on the delivery site proximate to
the delivery location that will ensure that no runoff water shall escape onto the City streets and violate the “Drainage, Flood and Pollution Control Ordinance (Chapter 14, Article 12)”, for the cleaning and
washdown. We will not assume liability for any damage trespass or violation of the “Drainage, Flood and Pollution Control Ordinance as a
result of this cleaning and washdown, and the customer agrees to indemnity and hold XYZ Company harmless against all liabilities, loss
and expense incurred as a result of any damage or trespass caused by such cleaning and washdown.
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City and County of Honolulu July 2018 | Construction Stormwater Quality Workshops
5. Concrete washout is not leak-proof (holes, cracks, unsealed)
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City and County of Honolulu July 2018 | Construction Stormwater Quality Workshops
6. Unlined concrete washout pits
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City and County of Honolulu July 2018 | Construction Stormwater Quality Workshops
7. Overflow spills (overfilling, missing containment, moving containment, splattering out)
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City and County of Honolulu July 2018 | Construction Stormwater Quality Workshops
8. Uncontained saw-cutting slurry
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City and County of Honolulu July 2018 | Construction Stormwater Quality Workshops
9. Leaving materials unprotected from rain and runoff
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City and County of Honolulu July 2018 | Construction Stormwater Quality Workshops
10. Concrete washout water entering storm drains
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City and County of Honolulu July 2018 | Construction Stormwater Quality Workshops
Deficient Concrete Waste Management
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City and County of Honolulu July 2018 | Construction Stormwater Quality Workshops
Proper Concrete Waste Management
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City and County of Honolulu July 2018 | Construction Stormwater Quality Workshops
CHECK LIST ITEMS TO CONSIDER STAGING – What is the best place to sit my concrete washout? SUPPLIES – Do I have what I need to contain slurries and solids? INLET PROTECTION – Are there any inlets nearby that need to be protected? WEATHER – If rainy, should I reschedule? Is it worth taking the risk? TRAINING – Is my crew aware of proper concrete washout BMPs?
PRE-PLANNING IS KEY!27
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City and County of Honolulu July 2018 | Construction Stormwater Quality Workshops
Best Management Practices (BMPs)
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City and County of Honolulu July 2018 | Construction Stormwater Quality Workshops
BMP # 1 – Plan out your BMPs Keep supplies on hand
Concrete washout location • Convenient access to concrete trucks, preferably near the area where
concrete is being poured. • DO NOT place near storm drains, open ditches, or waterbodies.• Place on level ground
Having BMPs isn’t enough, but they also need to be PROPERLY placed
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City and County of Honolulu July 2018 | Construction Stormwater Quality Workshops
BMP # 2 – Always Collect Concrete Wastes Collect and retain concrete washout slurry and solids
• Use leak-proof containers• Use a liner under containers to catch/contain spills• Clean up any drops or spills on the ground• Catch drips from pump trucks and hoses• Contain or vacuum saw-cutting slurry• Do not mix concrete next to a storm drain
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City and County of Honolulu July 2018 | Construction Stormwater Quality Workshops
Concrete Washout - Good options1. Kiddie poolsOne kiddie pool per concrete truck
2. Wood box with plastic liner3. 55-gallon drums4. Metal or plastic bins5. Wheel barrow6. Buckets
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City and County of Honolulu July 2018 | Construction Stormwater Quality Workshops
Concrete Washout - Construct your own• Dug into the ground or built above grade • Plastic lining should be free of tears or holes that would allow the
washout water to escape. • Use plastic sheeting as a liner (not Mirafi fabric)• Stop using when filled to 75% capacity.• Inspect and maintain concrete washout• BMP Manual Fact Sheet WM-8
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City and County of Honolulu July 2018 | Construction Stormwater Quality Workshops
BMP #3 – Liquid Waste Handling Allow washwater to evaporate and solids to harden.
• Cover container in case of an unforeseen rain event to prevent overflows
─ Use tarps, plastic sheeting, plywood boards.
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City and County of Honolulu July 2018 | Construction Stormwater Quality Workshops
BMP #4 - Recycle or Reuse Hardened concrete can be crushed and recycled or reused as a construction material.
• Deliver to a licensed recycling facility• Crush and reuse onsite (fill, rock walls, etc)
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City and County of Honolulu July 2018 | Construction Stormwater Quality Workshops
BMP #5 - Handling of thin-set or drybondmortar, plaster, stucco, and grout.• Do not dump excess materials on the ground• Contain materials, allow to harden, and dispose as a solid mass• Avoid mixing excess amounts of materials
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City and County of Honolulu July 2018 | Construction Stormwater Quality Workshops
BMP #6 – Protect dry materials from rain and runoff
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City and County of Honolulu July 2018 | Construction Stormwater Quality Workshops
BMP #7 – Protect storm drain inlets
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City and County of Honolulu July 2018 | Construction Stormwater Quality Workshops
BMP #8 – Use less water Use less water to wash down chute and tools NEVER wash concrete slurry - or anything - into storm drain inlets
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City and County of Honolulu July 2018 | Construction Stormwater Quality Workshops
BMP #9 – Clean up spills and overspills Maintain good housekeeping Keep public sidewalks and roadways clean
• Do not cover up concrete drips with spray paint! Preventive is better than reactive
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City and County of Honolulu July 2018 | Construction Stormwater Quality Workshops
BMP #10 – Educate employees and subcontractors• Educate concrete-handling workers on how to properly handle
concrete and other building materials ─ Masons─ Drywall, plaster, and stucco contractors
• Projects involving concrete:─ Pouring of foundations, sidewalks, and driveways─ Rock walls, CMU walls, and retaining walls─ Drywall, plaster, stucco work
• Tip: Arrange for contractor’s superintendent or representative to oversee and enforce concrete waste management procedures.
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City and County of Honolulu July 2018 | Construction Stormwater Quality Workshops
Enforcement - Potential Penalties
It doesn’t need to enter the storm drain to be a violation. If the concrete slurry hits the road or curb it is considered a violation.
The City may issue warnings or fines depending on the severity of the violation, which could range from $1,000 to $25,000 per violation per day. State and federal enforcement could add up to $50,000 per violation per day, and may include criminal prosecution
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City and County of Honolulu July 2018 | Construction Stormwater Quality Workshops
These public resources provide guidance: www.cleanwaterhonolulu.com EPA’s Concrete Washout Fact Sheet City & County BMP Manual for Construction
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City and County of Honolulu July 2018 | Construction Stormwater Quality Workshops
BMPs Quick Reference Booklet http://www.honolulu.gov/rep/site/dfmswq/library/QuickRefBook_July2013.pdf
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Review Exercise
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Please log into the following website:
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We will now review the answers
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Poll Question #1
Who is responsible for properly handling concrete and other home building materials at the jobsite?A. Main Contractor or Homeowner/BuilderB. Concrete delivery companyC. Pump truck company
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Poll Question #2
Which ones are good options for concrete washout?A. B.
C. D. All of the above
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Poll Question #3
How could this be prevented?A. Provide more washout containers or larger capacityB. Train workersC. A and BD. Cannot be prevented
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Poll Question #4
How could this be prevented?A. Vacuum slurry as it is generatedB. Protect storm drain inlet before saw-cuttingC. Train workersD. A, B, and CE. Cannot be prevented
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Poll Question #5
Which BMP is missing?A. Containment bermsB. Nothing
5050
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Poll Question #6
How could this be prevented?A. Keep washout containers on handB. Train workersC. A and BD. Cannot be prevented
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Poll Question #7
Which one is a proper concrete washout?A. B.
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Poll Question #8
Is this deficiency subject to fines?A. Yes, it is an illicit discharge hitting the curb and then entering the storm drainB. No, there’s nothing wrong with this picture
5353
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Poll Question #9
Which one is the correct use of concrete?A. B.
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Poll Question #10
How do you feel about concrete washout BMPs?A. I’m on board with it!B. I want to comply, but it’s impracticalC. I want to comply but it’s expensiveD. I don’t see the point
5555
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Take Our Online Survey!Please log into the following website:https://www.surveymonkey.com/r/concrete-washout2018
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City and County of Honolulu July 2018 | Construction Stormwater Quality Workshops
Thank you for participating in this exercise
Thank you for completing the survey
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Thank you!
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