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Boeing Company (the) — Technical Presentation (August 2020)
50 slides from Boeing Company (the)'s technical presentation, Aug 11, 2020
Slide 1: Santa Susana Field Laboratory Public Meeting: Site-Wide Summary of Activities
SANTA SUSANA FIELD LABORATORY PUBLIC MEETING SITE-WIDE SUMMARY OF ACTIVITIES With support from August 11, 2020 SSFL Stormwater Expert Panel
Slide 2: Meeting Orientation: Objectives and Agenda
Meeting Orientation 2 Meeting Objectives • Provide opportunity for the Stormwater Expert Panel to provide an update on stormwater sampling results and management activities at SSFL, and respond to questions raised in a recent public survey • Provide interested members of the public an opportunity to
Slide 3: Meeting Orientation: Proposed Ground Rules
Meeting Orientation 3 Proposed Ground Rules • Please submit your questions using the Q&A feature on Zoom o If unable to use Q&A feature please call 818-466-8800 to submit your questions for the expert panel • We will answer your questions after the presentation • Focus your questions on topics addre
Slide 4: Outline
Outline 4 • Background and Panel Introduction • Public Survey Responses • SSFL Stormwater Overview • Key Findings this Year • Previously-Submitted Questions from the Public • Summary MS August July 25, 11,2018| 2020|SSFL SSFLStormwater StormwaterExpert ExpertPanel PanelPublic PublicMeeting Meeting
Slide 5: Background
5 Background
Slide 6: Stormwater Expert Panel Introduction
Stormwater Expert Panel Introduction 6 • Dr. Bob Gearheart, PE, Humboldt State University • Jon Jones, PE, Wright Water Engineers • Dr. Michael Josselyn, WRA Consultants • Dr. Bob Pitt, PE, University of Alabama • Dr. Michael Stenstrom, PE, University of California, Los Angeles • Panel consultant: G
Slide 7: Panel's Ongoing Role and Scope
Panel’s Ongoing Role and Scope 7 • Independent panel formed in response to the 2007 Cease and Desist Order from the RWQCB o “…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.
Slide 8: SSFL Overview
SSFL Overview 8 • Former rocket testing and energy research facility • Industrial activities have ceased and facilities removal is underway o Nuclear energy research operations ceased in 1989 o Rocket engine testing operations ended in 2006 • Current activities include environmental monitoring/sampl
Slide 9: NPDES Permit Overview
NPDES Permit Overview 9 • Stormwater discharges at SSFL are regulated by the LARWQCB through an individual NPDES permit, which requires: o Composite sampling at 12 stormwater outfalls; and o Compliance with approximately 50 Numeric Effluent Limits (NELs) – protective of both human health and aquatic
Slide 10: Public Survey Responses
10 Public Survey Responses MJ
Slide 11: Public Survey Responses
Public Survey Responses: Please rank your level of interest in the following stormwater-related subjects. 11 1. Stormwater pollutant source assessment of 2019/2020 rainy season NPDES exceedances o 5 of 12 respondents identified this as their #1 interest 2. Post-wildfire watershed recovery assessment
Slide 12: Public Survey Responses
Public Survey Responses: Please rank your level of interest in the following areas. 12 7. Southern buffer zone (Outfall 001 and 002 watersheds) o 8 of 12 respondents identified this as their #1 interest 8. Silvernale stormwater treatment system (Outfall 018) 9. Northern Drainage (Outfall 009 watersh
Slide 13: SSFL Stormwater Overview
13 SSFL Stormwater Overview MJ
Slide 14: SSFL NPDES Outfalls
SSFL NPDES Outfalls 14 Outfall Boundary MJ August July 25, 11,2018| 2020|SSFL SSFLStormwater StormwaterExpert ExpertPanel PanelPublic PublicMeeting Meeting
Slide 15: Simi Valley, Calleguas Creek Tributaries, Dayton Creek
Simi Valley 15 Calleguas Creek Tributaries Dayton Creek West Hills neighborhood Bell Creek Tributaries MJ August July 25, 11,2018| 2020|SSFL SSFLStormwater StormwaterExpert ExpertPanel PanelPublic PublicMeeting Meeting
Slide 16: 2019-20 was a wetter than average year
2019-20 was a wetter than average year 16 • Nine qualifying rain events (>0.10 inch in 24-hrs) o 21 discharge samples and 5 seven-day follow up samples o Only one storm was larger than the 24-hr 1-year recurrence interval storm (2.5-in) and had a 24-hr storm depth of 2.65 inches (1-yr event) • Total
Slide 17: Historical Overview – NPDES Sampling All SSFL Outfalls
Historical Overview – NPDES Sampling All SSFL Outfalls 17 BG MJ August July 25, 11,2018| 2020|SSFL SSFLStormwater StormwaterExpert ExpertPanel PanelPublic PublicMeeting Meeting
Slide 18: Historical Overview – NPDES Sampling All SSFL Outfalls
Historical Overview – NPDES Sampling All SSFL Outfalls 18 Similar post-wildfire rain years, but substantially fewer discharges and exceedances in 2018-19 BG August July 25, 11,2018| 2020|SSFL SSFLStormwater StormwaterExpert ExpertPanel PanelPublic PublicMeeting Meeting
Slide 19: Historical Overview – NPDES Sampling All SSFL Outfalls
Historical Overview – NPDES Sampling All SSFL Outfalls 19 Similar wet, non-fire years; fewer discharges but slightly more exceedances this year MJ August July 25, 11,2018| 2020|SSFL SSFLStormwater StormwaterExpert ExpertPanel PanelPublic PublicMeeting Meeting
Slide 20: 2019/2020 NPDES Benchmark Exceedances
2019/2020 NPDES Benchmark Exceedances (No Limit Exceedances) 20 Outfall Outfall Outfall Outfall Outfall Parameter 001 002 008 009 018 Total Gross Alpha 1* 0 0 0 0 1 Iron 3 3 NR NR 0 6 Lead 1 0 0 0 0 1 Manganese 1 0 NR NR 0 1 TCDD TEQ (no DNQ) 2 1 0 0 0 3 Total Exceedances 8 4 0 0 0 12 Total Sampling
Slide 21: Key Findings This Year #1
21 Key Findings This Year #1: Exceedance counts and concentrations have fallen markedly since last year’s post-fire conditions, and we're now back to near normal (pre-fire) water quality conditions BP
Slide 22: Woolsey Wildfire Extent
Woolsey Wildfire Extent 22 • 79% of site burned MS in November 2018 • Outfall watersheds most impacted: o Outfall 011/001 o Outfall 018/002 o Outfall 008 8 18 • Last wildfire was 11 in 2005 (Topanga) 2 1 BP August July 25, 11,2018| 2020 SSFL | SSFL Stormwater Stormwater Expert Expert Panel Panel Pub
Slide 23: Number of Exceedances Decreasing with Time
Number of Permit Limit and Benchmark Exceedances are Decreasing with Time 23 10 0 No. of Measured Exceedances by 8 2 Daily Rainfall (in) 6 4 Outfall 4 6 2 8 0 10 BP August July 25, 11,2018| 2020|SSFL SSFLStormwater StormwaterExpert ExpertPanel PanelPublic PublicMeeting Meeting
Slide 24: Concentrations are Decreasing With Time (Lead Example)
Concentrations are Decreasing With Time (Lead Example) 24 BP August July 25, 11,2018| 2020 SSFL Stormwater | SSFL Expert Stormwater Panel Expert Public Panel Meeting Public Meeting
Slide 25: Key Findings This Year #2
25 Key Findings This Year #2: The BMPs and Storm Water Treatment Systems (SWTS) generally continue to be very effective BG
Slide 26: Structural treatment controls target RFI and critical source areas
Structural treatment controls target RFI and other critical source areas 26 BG August July 25, 11,2018| 2020|SSFL SSFLStormwater StormwaterExpert ExpertPanel PanelPublic PublicMeeting Meeting
Slide 27: 009 Watershed BMP Performance Results (Lead Example)
009 Watershed BMP Performance Results (Lead Example) 27 Lead concentrations are significantly reduced for most BMP types with performance monitoring 100 10 1 0.1 * * (2009-present) (2013-present) (2013-present) (2015-present) (2019-present) Most of the storms less than 1-inch are contained in the lo
Slide 28: 009 Watershed BMP Performance Results (Dioxins Example)
009 Watershed BMP Performance Results (Dioxins Example) 28 Uncharacteristically high concentrations at ELV BMP this year; cause is being investigated 0.0001 0.000001 0.00000001 0.0000000001 * * (2009-present) (2013-present) (2013-present) (2015-present) (2019-present) * Effluent flows to Lower Lot B
Slide 29: Key Findings This Year #3
29 Key Findings This Year #3: Boeing and NASA continue to implement expert panel recommendations BG
Slide 30: Review of 2019 BMP Recommendations
Review of 2019 BMP Recommendations 30 Watershed Recommendation Status 001 & 002 New subarea monitoring in buffer zone to evaluate sources of recent exceedances 008 Condition assessment of post-fire erosion and sediment controls and vegetation reestablishment, and repairing or supplementing where
Slide 31: Review of 2019 BMP Recommendations
Review of 2019 BMP Recommendations 31 Watershed Recommendation Status 011 Make Stormwater Treatment System (SWTS) operational (including repair of fire‐damaged electrical system) 018 Assess feasibility of increasing pond capacity to allow more Permitting stormwater to be treated by SWTS feasibilit
Slide 32: Key Findings This Year #4
32 Key Findings This Year #4: Expert panel continues to evaluate stormwater runoff from potentially impacted areas and recommends treatment as appropriate BP
Slide 33: Southern Buffer Zone Subarea Monitoring Study
Southern Buffer Zone Subarea Monitoring Study 33 BP August July 25, 11,2018| 2020|SSFL SSFLStormwater StormwaterExpert ExpertPanel PanelPublic PublicMeeting Meeting
Slide 34: Southern Buffer Zone Sources and Conditions
Southern Buffer Zone 34 Sources and Conditions Utility Poles (dioxin source) Metal Stakes (iron source) Vegetation Recovery Looking Southeast toward OF001 Wattles later added (taken ~20 months post-fire) BP August July 25, 11,2018| 2020|SSFL SSFLStormwater StormwaterExpert ExpertPanel PanelPublic Pu
Slide 35: Buffer Zone Subarea Sampling Results: Lead Example
BUFFER ZONE SUBAREA SAMPLING RESULTS: Lead Example (2019/2020 Season) 35 Potentially impacted soils do not appear to be contributing to exceedance at downstream outfall (001). 10 1 0.1 Natural Potentially Natural Potentially Background Impacted Background Impacted Area Soil Area Area Soil Area BP Au
Slide 36: Buffer Zone Subarea Sampling Results: Dioxin Example
BUFFER ZONE SUBAREA SAMPLING RESULTS: Dioxin Example (2019/2020 Season) 36 Potentially impacted soils do not appear to be contributing to exceedance Natural Potentially Natural Potentially at downstream outfalls Background Impacted Area Soil Area Background Area Impacted Soil Area (001, 002). Highes
Slide 37: Treated Wood Pole BMPs
Treated Wood Pole BMPs 37 Cleared bases at 88 Poles Wattles added to approximately 115 Poles BP August July 25, 11,2018| 2020 SSFL Stormwater | SSFL Expert Stormwater Panel Expert Public Panel Meeting Public Meeting
Slide 38: Key Findings This Year #5
38 Key Findings This Year #5: The recent benchmark exceedances are believed to be due to background soil, soil near treated wood, atmospheric deposition, pavement solids, metal pipe supports, and potentially impacted soils BP
Slide 39: Constituent Source Evaluation
Constituent Source Evaluation 39 • Potential Sources Evaluated o Soils from former operational and contaminated areas o Pavement solids Lines of Evidence o Treated wood and adjacent soils o Atmospheric deposition Congeners Particulate (dioxins) o Natural background soils and Ratios strength (metals)
Slide 40: Key Findings: Preliminary Constituent Source Analysis
Key Findings: Preliminary Constituent Source Analysis 40 Exceeding Constituent Potential Sources Determined Through Forensic (Outfall Exceeding in Evaluation 2019/2020) Iron (OF001 and OF002) Natural background soils, metal pipe supports (001) Lead (OF001) Natural background soils, pavement solids,
Slide 41: Example Source Analysis Technique: Iron Ratios
Example Source Analysis Technique: 41 Iron Ratios Iron Ratios Analysis of 2012-2020 Stormwater Samples Linear background soil data show soils have a consistent Mn:Fe ratio, thereby supporting the basis of using other constituent ratios to Mn or Fe as a tool to assess whether background soils are a p
Slide 42: Example Source Analysis: Dioxins
Example Source Analysis: Dioxins 42 These data, along with iron ratios and congener fingerprinting, give us a weight of evidence of the sources BP August July 25, 11,2018| 2020 SSFL | SSFL Stormwater StormwaterExpert Expert Panel Panel Public Public Meeting Meeting
Slide 43: Example Source Analysis: Dioxins
Example Source Analysis: Dioxins 43 Iron Ratios Analysis of 2019/2020 Stormwater Samples Dioxin:Iron ratios confirm background soils as primary source of recent exceedances at OF001, 002 Red marker border = exceedance, Black marker border = detected BP August July 25, 11,2018| 2020 SSFL | SSFL Storm
Slide 44: Key Findings This Year #6
44 Key Findings This Year #6: The Annual Report will again make new BMP and monitoring recommendations JJ
Slide 45: Preliminary Recommendations (Examples)
Preliminary Recommendations 45 (Examples) • Evaluate removal of pipe support stakes (iron source) • Add wattles around additional treated wood poles (dioxin source) • Continue to evaluate subarea sample results from Southern Buffer Zone (to further hone in on sources) • Continue to monitor CM-9 clog
Slide 46: Questions from the Public
46 Questions from the Public JJ
Slide 47: Questions from Public
Questions from Public 47 • Relationship between "exceedances" and any human or ecological health impacts. For example, are current permit standard levels unnecessarily low or not low enough (possibly compared with natural waters) to protect both? o EP Response: All permit limits and benchmarks are b
Slide 48: Questions from Public
Questions from Public 48 • Stormwater quality in Coca Drainage and performance of outfall 18 o EP Response: Stormwater runoff from Coca flows to the Silvernale SWTS which has the highest level of treatment onsite. OF018 had three treated stormwater discharges this year from the SWTS and had no excee
Slide 49: Summary
Summary 49 1. Exceedance counts and 4. Expert panel continues to evaluate concentrations have fallen markedly stormwater runoff from potentially since last year’s post-fire impacted areas and recommends conditions, and we're now back to treatment as appropriate near normal (pre-fire) water quality 5
Slide 50: Questions THANK YOU
Questions 50 THANK YOU Additional Information (e.g., Annual Report, Panel Presentations, NPDES Permit, and Technical Reports): www.boeing.com/principles/environment/santa-susana MS August July 25, 11,2018| 2020|SSFL SSFLStormwater StormwaterExpert ExpertPanel PanelPublic PublicMeeting Meeting
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