watertectonics presentation for linked in regulatory
TRANSCRIPT
![Page 1: WaterTectonics Presentation for Linked In Regulatory](https://reader034.vdocuments.pub/reader034/viewer/2022051006/58eccf971a28abd9268b4721/html5/thumbnails/1.jpg)
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Managing Construction Site Water2015
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Outline
• WT Introduction
• Evaluating Construction Projects• Discharge Locations• Permitting• Design Factors• BMPs (Passive vs. Active)
• Quick Project Checklist
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We Treat Water
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Company Overview
• Permanent and Temporary Water Treatment Systems
• Hundreds of Treatment Projects Completed Since 1999– Permitting, Design, R&D– Manufacture, Integrate, Install– Turnkey Operations & Maintenance – Training Courses, Remote Monitoring & Assistance
• Based in Everett, WA
• 60+ employees
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Team of Experts
Research & Development
Design
Manufacturing Field Operations
Engineering
Project Management
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Pre‐Construction Services
Confidential & Proprietary
COST ANALYSISPrepare project cost
estimates and alternate analyses..
PERMITTING/PLAN PREPDetermine permitting needs, apply for permits, negotiate with AHJ, prepare SWPPPs,
Technical Water Management Plans (EPA)
TREATABILITY STUDIESIn‐house testing & analysisLab & field‐scale programs
QAPP plans
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Construction Services
TRAINING COURSESDOE‐certified courses in
various treatment technologies, both field and classroom training
modules
EQUIPMENT SUPPLIER & FIELD SERVICE
Provide equipment to meet discharge requirements,
Mobilization/DemobilizationMaintenance support, both remote and on‐site
as needed.
MONITORING
CESCL inspections and associated DMR reporting &
compliance, water quality monitoring and
analytical sample collection
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Construction Technologies
Conidential & Proprietary
PHATBOXAutomated pH Adjustment
Mobile: 50‐350gpmFixed: Up to 5,000gpm
WAVEIONICSElectrocoagulation
Mobile: 50‐1,000gpmFixed: Up to 5,000gpm
ROADSIDE ACISTChemical Treatment SystemMobile: 300‐1,000gpmFixed: Up to 5,000gpm
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Evaluating a Construction Project
• Things to Consider: Discharge Location
• Regulations• Permits• Discharge Limits
Site Characteristics• Soil Type• Rainfall Patterns• Schedule
BMPs• Planning• SWPPP
Budget
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Discharge Location
Drives ALL Permitting & Treatment
Surface Water
Dept. of Ecology City/County
Settleable Solids, pHAuthorization, Minor, Major
SS/CSO
KCIW/Local Sewer District City/County
Turbidity, pHAdministrative Order
Detention, pH Adjustment, Mechanical Filtration, Active Treatment, GAC
Detention, pH Adjustment, Mechanical Filtration, GAC
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Discharge to Surface Water
NPDES (aka Construction Stormwater General Permit or CSWGP)• Applicability
• Construction Sites disturbing ≥ 1 acre and will discharge stormwater offsite
• Sites under an acre that are part of a common plan (residential)• Other sites that may discharge to sensitive areas or have contamination
• Requirements• Must comply with permit limits for Turbidity (<25) and pH (6.5‐8.5)• Must have a site‐specific Stormwater Pollution Prevention Plan (SWPPP)• Must have a CESCL perform site inspection weekly and take water quality readings
• Additional sampling/treatment required if site has contaminantsPROPOSED UPDATES for JAN 1st:• More information required for Contaminated sites• Contaminated sites will use AKART – Active Treatment• Drilled shaft water (no drilling fluids) can be infiltrated• SWPPP Elements (preserving topsoil/LID)
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Discharge to Sanitary Sewer/CSO
King County Industrial Waste Discharge Authorization and/or Local Approval• Applicability
• Sites discharging to a Combined Sewer• Construction Sites disturbing < 1 acre and will discharge stormwater offsite• Alternate discharge for sites that may discharge to sensitive areas or have contamination
• Requirements• Must comply with permit limits for Maximum Daily Volume, Settleable Solids(<7mg/L) and pH (5.5‐12)
• Must take Field Measurements (min Flow/Volume, Settleable Solids, pH) every day that discharge occurs
• Additional sampling/treatment required if site has contaminants• Must submit monthly reports and pay per gallon fee.
Current review time for KCIW permit is at least 4 weeks, double if complex or contaminated site.
City of Seattle may hold grading permit until SSPTD is obtained.
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Local Authority
• Local Jurisdictions (City/County)– May require specific plans for work during the wet season
• Review SWPPP, site plans, geotech, may have formal application pkg
– May have more stringent discharge requirements than the State– Allow time for review and approval (4 weeks min)– Administrative fees associated with some approvals
City of Redmond – Wet Weather Plan City of Bellevue – Turbidity Monitoring PlanCity of Seattle – Drainage Side Sewer Permit $, Dry Season Grading ExtensionCity of Tacoma – Special Authorization to Discharge (SAD) $King County – Wet Season PlanSnohomish – Enhanced TESC Review
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• Surface Water– Turbidity
• 25 ntu benchmark• 250 enforcement level
– pH • 6.5 – 8.5
– Other as receiving water or past site activity dictates
• Sanitary Sewer/CSO– Settleable Solids
• <7 mg/L
– pH• 5.0 – 11.0
– Other as receiving water or past site activity dictates
Discharge Limits
2000 1000 500 100 5
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Site Characteristics
• Identify Site Characteristics1. Rainfall – how much runoff should we
plan on?2. Soil Type (i.e. Particle Size!) 3. Schedule – what time of year will the
work take place?4. Contamination Onsite
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Rainfall
• 1” rain on 1 acre of impervious surface = 27,000 gallons• Site Size = 2 acres• 1” Storm = Detention Required = 3 tanks (18,000 gallons each)• 2.5” Storm = Detention Required = 8 tanks (135,000 gallons)
Confidential & Proprietary
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Soil Type
10000 Gravel 0.016 sec2000 0.4 sec1000 1.7 sec600 Coarse Sand 4.6 sec300 Silt Fence, Ponds 19.0 sec200 Bioswales 42.0 sec150 1.25 min100 Fine Sand 2.8 min60 Passive filtration 7.8 min25 Pressurized SF 2.2 hrs15 Bag Filters 6.2 hrs10 Silt 14.0 hrs5 Active Treatment 56.0 hrs3 CESF/EC 155.3 hrs
1.5 26.0 days1 Clay 58.0 days
0.1 16 yrs0.01 Colloidal Particles 1600 yrs
Soil Type Time Required to
Settle 3ft
Particle Diameter (microns)
SS/CSO-Settleable Solids
Surface Water-Turbidity
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BMPs
• Source Control (i.e. Prevention)• Plastic Covering• Mulch• Hydroseeding• Nets & Blankets• Soil Roughening• Terracing• Construction Schedule• Check Dams / Straw Wattles• Outlet Protection• Stabilization Construction Entrances / Exits
GOAL = Cover Soils / Slow Velocity!Performance not dependent on particle size
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BMPs
• Runoff Control (i.e. Treatment)1. Detention Ponds / Vaults / Tanks2. Bioswales3. Silt Fencing4. Filter Bags5. Sand Filters6. Active Treatment
Confidential & Proprietary
GOAL = Remove soil particles from waterPerformance #1‐5 dependent on particle size
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Chitosan Enhanced Sand Filtration (CESF)
Electrocoagulation (EC)
Approval Level GULD GULD
Consumable Liquid Chitosan EC Cells
Labor On‐Site Labor When Operating
Automated Operator with Alerts
Contaminants Turbidity Only Turbidity, Metals, Emulsified Oils
Active pH Range 7 to 8 5 to 12
Active NTU Range 0 to 600 0 to 4,000+
Rental Cost (300 gpm) $195 to 225 / day $250 to 310 / day
Active Treatment BMPs
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SchedulePermitsActivitiesSeasonal
BMPsDischarge Limits
Civil PlansContingencies
BudgetMaterialsEquipment
Labor
SiteSoil Type
TopographyProximity to Sensitive Areas
Stormwater Pollution Prevention
Plan
Construction SWPPP
Confidential & Proprietary
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Case Study: Surface Water 7.7 Acres – Direct Discharge to Lake Washington
“The Geotechnical Engineering Design Study for Southport Hotel prepared by Hart Crowser (April 18, 2014) lists site soils as a combination of sand, silt, and clays at various depths. The depth to, and thickness of, the soil layers vary greatly throughout the site.”
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Case Study
• Initial Action• Site had 140,000 gallons of existing storage
in a detention vault• Site runoff for 1” storm = 208,000 gallons• 208,000 – 140,000 = 68,000• Divide by 8 hr shift = 8,500 gallons• Divide by minutes = ~140gpm
Influent Turbidity(NTU)
Effluent Turbidity(NTU)
Effective Particle Size Removal
125 48 63 microns
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Case Study
• Intermediate Action• Site could not meet turbidity benchmark• Added sand filter – still only reduced
turbidity down to 40 NTU• Submitted sample for particle size
distribution
Influent Turbidity(NTU)
Effluent Turbidity(NTU)
Effective Particle Size Removal
48 45 25 microns
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Case Study
• Final Action• Particle Size Distributions indicated
very small particles• Implemented WaveIonics
electrocoagulation system
Influent Turbidity(NTU)
Effluent Turbidity(NTU)
Effective Particle Size Removal
175 5 0.01 microns
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10000 Gravel 0.016 sec2000 0.4 sec1000 1.7 sec600 Coarse Sand 4.6 sec300 Silt Fence, Ponds 19.0 sec200 Bioswales 42.0 sec150 1.25 min100 Fine Sand 2.8 min60 Passive filtration 7.8 min25 Pressurized SF 2.2 hrs15 Bag Filters 6.2 hrs10 Silt 14.0 hrs5 Active Treatment 56.0 hrs3 CESF/EC 155.3 hrs
1.5 26.0 days1 Clay 58.0 days
0.1 16 yrs0.01 Colloidal Particles 1600 yrs
Soil Type Time Required to
Settle 3ft
Particle Diameter (microns)
Project Planning Quick List• Know the Site
• Discharge Location / Limits• Site Characteristics
• Rainfall• Schedule• Soil Type
• Regulatory Requirements • Get Permits
• Identify BMPs to Treat Turbidity/SS & Contaminants if present
• Implement BMPs
• Work the Plan!• Monitor• Report• Maintain & Adapt
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6300 Merrill Creek ParkwaySuite C‐100Everett, WA 98203
For more information please contact:Liisa Doty,National Construction Accounts [email protected] (206) 371‐1693
www.watertectonics.com
Thank you!