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Boeing Company (the) — The Boeing Company — Technical Presentation (May 2019)
25 slides from Boeing Company (the)'s technical presentation, May 9, 2019
Slide 1: Santa Susana Field Laboratory Post-Wildfire Stormwater Update
Santa Susana Field Laboratory Post-Wildfire Stormwater Update STORMWATER EXPERT PANEL LARW QCB MEETING | MAY 9, 2019 With support from
Slide 2: Outline
MS Outline NPDES Permit Stormwater Expert Panel Woolsey Wildfire Overview 2018-19 SSFL Permit Initial Sample Results – Preliminary Review ◦ Water year ◦ Outfall discharges ◦ Exceedances Preliminary Conclusions Looking Ahead 2
Slide 3: Santa Susana Field Laboratory
MS Santa Susana Field Laboratory Former rocket testing and energy research facility Industrial activities have ceased and facilities removal is underway ◦ Energy research operations ceased in 1989 ◦ Rocket engine testing operations ended in 2006 Current activities include environmental monitoring/sa
Slide 4: NPDES Permit
MS NPDES Permit Stormwater discharges at SSFL are regulated by the LARWQCB Individual NPDES permit issued in 2015, which requires: ◦ Composite sampling at 12 stormwater outfalls; and ◦ Compliance with approximately 50 Numeric Effluent Limits (NELs) – protective of both human health and aquatic life.
Slide 5: Stormwater Expert Panel
MS Stormwater Expert Panel Independent panel formed in response to the 2007 Cease and Desist Order from the RWQCB ◦ “…a panel to review site conditions, modeled flow, contaminants of concern, and evaluate the BMPs capable of providing the required treatment to meet the final effluent limits.” Ongoin
Slide 6: Woolsey Wildfire Overview
MS Woolsey Wildfire Overview W IL DFIRE E XT E N T S S F L R E S P ON SE / R E PAIRS / C ON T ROLS WATER SHED R E S P ONSE 6
Slide 7: Woolsey Wildfire Extent
MS Woolsey Wildfire Extent Area IV (Boeing/DOE) 79% of site burned Outfall watersheds most impacted: 8 ◦ Outfall 011/001 18 ◦ Outfall 018/002 11 ◦ Outfall 008 Last wildfire was in 2005 (Topanga) 2 1 7
Slide 8: Woolsey Wildfire Extent
MS Woolsey Wildfire Extent Fire perimeter Structures in Area IV, where DOE facilities are, were not burned 8
Slide 9: Effects of Wildfire
JJ Effects of Wildfire ◦ Lost vegetative cover ◦ Lost plant litter Burned sampling station at Outfall 018 ◦ Increased soil hydrophobicity (water repellent) ◦ Burned material including plastic sampler housing, metal platforms, batteries, HDPE pipelines, PVC fixtures, utility poles, etc. ◦ Temporarily
Slide 10: Hydrologic and Water Quality Response
JJ Hydrologic and Water Quality Response ◦ Increased runoff (frequency and volume) ◦ New pollutant sources (burned materials) ◦ Increased soil exposure and associated constituent mobilization With time these effects will be reversed with vegetative regrowth and as soil infiltration characteristics r
Slide 11: Previous studies of water quality following wildfires show an increase in many constituents
JJ Previous studies of water quality following wildfires in mostly undeveloped areas show an increase in many constituents Multiplicative Increase Constituent References Pre- to Post-Fire Conc. Arsenic* 7 Burton et al., 2016 [2006 Station Fire, CA] Burton et al., 2016 [2006 Station Fire, CA]; Stein
Slide 12: Example SSFL Response, Repairs, and Controls
JJ Example SSFL Response, Repairs, and Controls Hydromulch applied and fiber rolls installed Burned HDPE pipelines replaced to direct runoff to storm water treatment system (SWTS) Debris removed and ash vacuumed from burned areas Repair and maintenance of stormwater BMPs, including SWTS, and samplin
Slide 13: 2018-19 SSFL Permit Initial Sample Results Preliminary Review
BP 2018-19 SSFL Permit Initial Sample Results Preliminary Review WATER YE A R R E V IEW OU T FA LL D IS C H ARGES E XC E E DA NCES 13
Slide 14: Recent Exceedance History
BP Recent Exceedance History 2005-06 2010-11 2011-12 2012-13 2013-14 2014-15 2015-16 2016-17 2017-18 2018-19
Slide 15: Water Year Review (Oct 2018 – Present)
BP Water Year Review (Oct 2018 – Present) Exceedances (as compared to Total Rainfall in Number of Number of 2015 Permit effluent limitations) Year/ % of SSFL Year following Flow Discharge Wildfire Benchmark Burned (% of Average) Events Samples Permit Limit (Outfalls 001 (all other outfalls) and 002)
Slide 16: Water Year Review (Oct 2018 – Present)
BP Water Year Review (Oct 2018 – Present) Exceedances (as compared to Total Rainfall in Number of Number of 2015 Permit effluent limitations) Year/ % of SSFL Year following Flow Discharge Wildfire Benchmark Burned (% of Average) Events Samples Permit Limit (Outfalls 001 (all other outfalls) and 002)
Slide 17: Post-Wildfire Runoff Volume Effects Restricted to Small Events in Burned Watersheds
BP Post-Wildfire Runoff Volume Effects Restricted to Small Events in Burned Watersheds in Woolsey Wildfire at SSFL ◦ Statistically significant change in fully and partially burned Storm Size watersheds for storms <2-inches <2-in >2-in ◦ No statistically significant Burned Significant No significant
Slide 18: Where were the 2018-19 exceedances?
BP Where were the 2018-19 exceedances? Outfalls that burned had 55 of the 57 exceedances Outfall 018 burned, but because of storage capacity and advanced treatment, only had one exceedance (pH) Outfall 009 burned much less, and because it had many structural treatment BMPs, only had two exceedances
Slide 19: Outfall Samples/Effluent Limit or Benchmark Exceedances
Outfall Samples/Effluent Limit or Benchmark Exceedances* Event Dates Event Total (in) 001 002 003 004 005 006 007 008 009 010 011 018 Total 10/12-13/2018 0.48 0 11/21-22/2019 0.55 Note: A ‘0’ indicates that an 0 outfall sample was collected, but 11/28-29/2018 1.17 0 that no exceedances were 12/5-6/2
Slide 20: Measured Exceedances by Outfall
MJ Number of Permit Limit and Benchmark Exceedances are Decreasing with Time 10 0 Daily Rainfall Daily rainfall 9 2 Measured Exceedances by Outfall Area14 8 4 7 6 Outfall 001 6 8 Outfall 002 Woolsey Wildfire 5 10 Outfall 004 4 12 Outfall 006 3 14 Outfall 008 2 16 Outfall 009 1 18 0 20 Outfall 011 10
Slide 21: Outfall 008
MJ Example of stormwater concentrations returning to historically-normal levels Outfall 008 Post-Topanga Post-Woolsey 21
Slide 22: What sources most likely explain the 2018-19 NPDES outfall exceedances?
MJ What sources most likely explain the 2018- 19 NPDES outfall exceedances? Potential Sources Lines of Evidence ◦ Fire retardants ◦ Ash ◦ Hydromulch Congeners Particulate (dioxins) or ◦ Pavement solids strength ratios ◦ Treated wood and adjacent soils calculation (metals) ◦ Atmospheric deposition ◦
Slide 23: Preliminary Observations
MJ Preliminary Observations Exceedance Primary Source Most metals Natural background soils Dioxins Pavement solids, soils near treated wood, and burned treated wood and pipes Gross Alpha Only naturally occurring radionuclides detected Nitrates and Sulfates Baseflow from groundwater discharges Cyanid
Slide 24: Preliminary Conclusions
BG Preliminary Conclusions 1) 2018-19 had a large number of discharges and a large number of exceedances ◦ Rainfall was 150% of average ◦ 80% of site burned ◦ More runoff in burned watersheds compared to same size storm in prior years ◦ Higher constituent concentrations in burned watersheds 2) 2018-
Slide 25: Looking Ahead
MS Looking Ahead July 2019 ◦ Public Meeting: Review of 2018-19 NPDES results and source analysis ◦ Public Tour: Site condition/recovery October 31, 2019 ◦ Annual Report submitted to Regional Board 25
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