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 July 25, 2018 SSFL Stormwater Expert Panel
Slide 2: Outline
Outline 2 • Stormwater Expert Panel introduction • NPDES Permit overview • Questions of interest: 1. What has recent water quality been like? 2. What is SSFL doing to improve water quality? 3. How are the BMPs working? 4. How are the BMPs being maintained? 5. What did the Human Health Risk Assessmen
Slide 3: Stormwater Expert Panel Introduction
Stormwater Expert Panel Introduction 3 • Dr. Bob Gearheart, Humboldt State University • Jon Jones, Wright Water Engineers • Dr. Michael Josselyn, WRA Consultants • Dr. Bob Pitt, University of Alabama • Dr. Michael Stenstrom, Univ. California, Los Angeles • Panel consultant: Geosyntec (Brandon Steets
Slide 4: Panel’s On-Going Role and Scope
Panel’s On-Going Role and Scope 4 • Review NPDES compliance and BMP performance monitoring data • Investigate site-wide stormwater pollutant sources • Make recommendations for new BMPs or improvements to existing BMPs • Review Stormwater Human Health Risk Assessment (HHRA) • Public outreach MS July
Slide 5: NPDES Permit Overview
NPDES Permit Overview 5 • Stormwater discharges at SSFL are regulated by the LARWQCB through an individual NPDES permit, which requires: o Composite sampling at outfalls during storms, and o Compliance with Numeric Effluent Limits (NELs) – protective of both human health and aquatic life • NELs for
Slide 6: SSFL NPDES Outfalls
SSFL NPDES Outfalls 6 Outfall Sage Boundary 9 NASA Ranch 10 4 3 14 Boeing/DOE 12 6 7 13 5 Boeing Boeing NASA 8 18 11 2 19 1 MS July 25, 2018| SSFL Stormwater Expert Panel Public Meeting
Slide 7: What has recent water quality been like?
7 What has recent water quality been like? • 32-44 parameters are analyzed at every surface water outfall during every storm that produces runoff. • Over 250 parameters are analyzed at every outfall at least once annually. MJ
Slide 8: 2017-18 Rainfall Summary
2017-18 Rainfall Summary 8 • Four qualifying rain events (>0.10-in in 24-hrs) • Total annual rainfall 9.75-in (vs. 16.8-in average) 2017-18 2015-16 (most near-average recent year) 14 Cumulative Annual Rainfall (in) 12 10 8 1/8-10/18: 2.79-in 6 • 11 BMP samples collected • No outfalls discharged 4 2
Slide 9: 2017-18 Rainfall Summary
2017-18 Rainfall Summary 9 • Four qualifying rain events • Total annual rainfall 9.75-in (vs. 16.8-in average) 2017-18 2015-16 (most near-average recent year) 14 Cumulative Annual Rainfall (in) 12 2/26/18-3/3/18: 1.66-in 10 • 10 BMP samples collected 8 • No outfalls discharged 6 4 2 0 J Jul J J AAug
Slide 10: 2017-18 Rainfall Summary
2017-18 Rainfall Summary 10 • Four qualifying rain events • Total annual rainfall 9.75-in (vs. 16.8-in average) 2017-18 2015-16 (most near-average recent year) 14 Cumulative Annual Rainfall (in) 12 3/10-17/18: 1.93-in • No BMP samples collected 10 • No outfalls discharged 8 6 4 2 0 J Jul J J AAug A
Slide 11: 2017-18 Rainfall Summary
2017-18 Rainfall Summary 11 • Four qualifying rain events • Total annual rainfall 9.75-in (vs. 16.8-in average) 2017-18 2015-16 (most near-average recent year) 14 Cumulative Annual Rainfall (in) 12 3/20-23/18: 3.03-in • 15 BMP samples collected 10 • 2 outfalls discharged 8 6 4 2 0 J Jul J J AAug A A
Slide 12: 2017-18 Monitoring Summary
2017-18 Monitoring Summary 12 • Outfalls 009 and 002 discharged only during the last event • No exceedances at Outfall 009 • One exceedance at Outfall 002 o Iron result = 2.1 mg/L o Benchmark limit = 0.3 mg/L o Potential sources may include: Background soils Metal structures MJ July 25, 2018| SS
Slide 13: Addressing Metal Structures
Addressing Metal Structures 13 Before After Iron structures in the upstream areas have been painted. MJ July 25, 2018| SSFL Stormwater Expert Panel Public Meeting
Slide 14: Historical Overview – NPDES Sampling
Historical Overview – NPDES Sampling All SSFL Outfalls 14 2010-11 2011-12 2012-13 2013-14 2014-15 2015-16 2016-17 2017-18 MJ July 25, 2018| SSFL Stormwater Expert Panel Public Meeting
Slide 15: Historical Overview – NPDES Sampling
Historical Overview – NPDES Sampling All SSFL Outfalls 15 Similar rain years, but substantially fewer discharges and exceedances in 2017-18 2010-11 2011-12 2012-13 2013-14 2014-15 2015-16 2016-17 2017-18 MJ July 25, 2018| SSFL Stormwater Expert Panel Public Meeting
Slide 16: Historical Overview – NPDES Sampling
Historical Overview – NPDES Sampling All SSFL Outfalls 16 Similar rain years, but substantially fewer discharges and exceedances in 2016-17 2010-11 2011-12 2012-13 2013-14 2014-15 2015-16 2016-17 2017-18 MJ July 25, 2018| SSFL Stormwater Expert Panel Public Meeting
Slide 17: What is being done to improve water quality?
17 What is being done to improve water quality? BP
Slide 18: BMP Strategy for 008/009 Watersheds
BMP Strategy for 008/009 Watersheds 18 Unlike other outfalls, “end of pipe” stormwater treatment was not possible here without constructing environmentally-intrusive dams. So instead a distributed, watershed-based approach was implemented. Emphases were: • 008: Source removal, erosion control, and r
Slide 19: 008/009 Multi-Pronged Approach
008/009 Multi-Pronged Approach 19 • Source Controls • Treatment Controls o ISRA soil removal o Flow-through media filters o Pavement and building Culvert modifications removal B1, upper lot media filters Sedimentation basin and • Erosion/Sediment biofilter Controls and Restoration ELV treatm
Slide 20: CTL3 - Before and After
CTL3 - Before and After BP July 25, 2018 | SSFL Stormwater Expert Panel Public Meeting
Slide 21: CTL3 - March 2017
CTL3 - March 2017 BP July 25, 2018 | SSFL Stormwater Expert Panel Public Meeting
Slide 22: Area IV Pre-Demolition, 2003
Area IV Pre-Demolition, 2003 22 BP July 25, 2018| SSFL Stormwater Expert Panel Public Meeting
Slide 23: Area IV Post Demolition, 2016
Area IV Post Demolition, 2016 23 BP July 25, 2018| SSFL Stormwater Expert Panel Public Meeting
Slide 24: Example 009 BMPs
Example 009 BMPs 24 12 Culvert Sedimentation Basin Modifications and Biofilter Expendable Launch Vehicle (ELV) Treatment BMP BP July 25, 2018| SSFL Stormwater Expert Panel Public Meeting
Slide 25: Most Recently Installed BMPs
Most Recently Installed BMPs 25 Sandbag raised CM-3 road at end of Well runoff diversion 13 road constructed Erosion/sediment controls installed CM-1 road runoff in former shooting diversion constructed range area and media filter to be rebuilt this summer Upper lot media filter completed Admin area
Slide 26: Administration Area Inlet Filters
Administration Area Inlet Filters 26 Drop Inlet Filters filled with Site Media (Sand, GAC, Zeolite) Weighted Wattle filled with media (Perlite, GAC, Zeolite) BP July 25, 2018| SSFL Stormwater Expert Panel Public Meeting
Slide 27: Upper Parking Lot Media Filter
Upper Parking Lot Media Filter 27 During Construction After Construction 27 BP July 25, 2018| SSFL Stormwater Expert Panel Public Meeting
Slide 28: New Road Runoff Inlets to CM-3 and CM-1
New Road Runoff Inlets to CM-3 and CM-1 28 New Curb 28 New Trench Treated runoff flows under road Runoff to CM-3 CM-3 BP July 25, 2018| SSFL Stormwater Expert Panel Public Meeting
Slide 29: Well 13 Road BMPs
Well 13 Road BMPs 29 Before After Sandbag berms extended and raised BP July 25, 2018| SSFL Stormwater Expert Panel Public Meeting
Slide 30: Former Shooting Range BMPs
Former Shooting Range BMPs 30 Sandbag berms Fiber rolls Bank stabilization Silt fencing BP July 25, 2018| SSFL Stormwater Expert Panel Public Meeting
Slide 31: Special Study Preliminary Results
Special Study Preliminary Results 31 • Study Objectives o Where (spatially) are dioxins and lead in stormwater predominantly coming from within 009 watershed? o What are the predominant pollutant sources to the paved subareas? • Initial results indicate potential contributors to past OF009 stormwate
Slide 32: How are the BMPs Working?
32 How are the BMPs Working? BP
Slide 33: Historical BMP Performance: Lead
Historical BMP Performance: Lead 33 Historically, lead concentrations are being significantly reduced for most BMP types 100 10 1 0.1 The figure above summarizes all available data, but in the most recent dataset (2017-18): • Nearly all BMP influent results were below the lead Permit limit • No meas
Slide 34: Historical BMP Performance: Dioxin
Historical BMP Performance: Dioxin 34 Dioxin concentrations are being significantly reduced for all BMP types 0.001 0.0001 >Q3+1.5*IQR Q3+1.5*IQR 0.00001 75th percentile (Q3) Interquartile Range 0.000001 (IQR) Median 0.0000001 25th percentile (Q1) 0.00000001 Q1-1.5*IQR 0.000000001 Half of the storms
Slide 35: How are the BMPs being maintained?
35 35 How are the BMPs being maintained? BG
Slide 36: BMP Maintenance Summary
BMP Maintenance Summary 36 Quantity Routine Repair/ BMPs Implemented Implemented Maintenance Upgrade Mechanical/Chemical 2 After major storm events Annually as needed Treatment Systems Structural BMPs 5 After major storm events Annually as needed Structural BMPs with 16 After major storm events Annu
Slide 37: Northern Drainage Inspections
Northern Drainage Inspections 37 • Inspection conducted May 30, 2018 • 1 recommendation for repairs and 2 watch areas BG July 25, 2018| SSFL Stormwater Expert Panel Public Meeting
Slide 38: Media Filter Maintenance Needs
Media Filter Maintenance Needs 38 • Expected years to needed media replacement (based on total suspended solids loading) is evaluated annually for each media filter • Inspections are also conducted 72-hours after each rain event to make note of extended ponding • CM-1 media replacement is currently
Slide 39: What did the Human Health Risk Assessment Evaluate and Conclude?
What did the Human Health Risk 39 Assessment Evaluate and Conclude? BS
Slide 40: HHRA Scope
HHRA Scope 40 • Regional Board issued Order to Boeing to conduct stormwater HHRA in response to public comment • Quantitative assessment of potential risks and hazards associated with human contact with stormwater and treated groundwater discharges from the SSFL o Other media (e.g., soil, sediment,
Slide 41: HHRA Analyzed NPDES Outfalls
HHRA Analyzed NPDES Outfalls 41 Outfall Sage Boundary 9 NASA Ranch 10 4 3 14 Boeing/DOE 12 6 7 13 5 Boeing Boeing NASA 8 18 11 2 19 1 BS July 25, 2018| SSFL Stormwater Expert Panel Public Meeting
Slide 42: HHRA Timeline Review
HHRA Timeline Review 42 • Order issued to perform HHRA • Draft Work Plan submitted for RWQCB and Office of 2015 Environmental Health Hazard Assessment (OEHHA) review • Revised Draft Work Plan submitted and released for public comment 2016 • Public comments received • Work Plan revised and approved 2
Slide 43: HHRA Approach
HHRA Approach 43 • Recreators (child/adult) were evaluated • Exposure was assumed to occur at each outfall separately • Exposure frequency – days per year of exposure connected to the flow days (1-2 days per week) • Exposure pathways o Incidental ingestion and dermal contact evaluated as primary pat
Slide 44: HHRA Findings
HHRA Findings 44 • Potential recreational exposure via incidental ingestion and dermal contact in surface water runoff exiting the SSFL via Outfalls 001, 002, 008, 009, 011, 018, and 019 are below levels of concern as established by CalEPA and USEPA (see chart on next slide). • Volatilization/inhala
Slide 45: Incremental Cancer Risk
Comparison of Lower and Upperbound Cumulative Incremental Cancer Risk Estimates by Outfall 45 1:1,000,000 8:10,000,000 Incremental Cancer Risk 6:10,000,000 4:10,000,000 2:10,000,000 1:10,000,000 * *Outfall 019 is not planned to be used for surface water discharge BS July 25, 2018| SSFL Stormwater Ex
Slide 46: Documents Available Online
Documents Available Online 46 Revised HHRA Work Plan http://www.boeing.com/resources/boeingdotcom/principles/en vironment/pdf/Revised_Human_Health_Assessment_Work_Pla n_SSFL.pdf Final HHRA Submitted to RWQCB https://www.waterboards.ca.gov/losangeles/public_notices/Bo eing/2017/16.FinalHHRAforSurface
Slide 47: Summary
Summary 47 Q1: What has recent water quality been like? A: There were no Permit Limit exceedances at any NPDES Outfalls this season. There was one benchmark limit exceedance at Outfall 002, for iron. Additionally, both discharges and exceedances have been reduced over time. MS July 25, 2018| SSFL St
Slide 48: Summary (cont’d)
Summary (cont’d) 48 Q2: What is SSFL doing to improve water quality? A: Recent BMP efforts, rooted in monitoring data, have been significant and reflect the best available technology. Special studies to identify potential sources of historical exceedances are also ongoing. Q3: How are the BMPs worki
Slide 49: Summary (cont’d)
Summary (cont’d) 49 Q4: How are the BMPs being maintained? A: Maintenance needs are reviewed after each storm event and on an annual basis, with repairs made as needed. Q5: What did the HHRA conclude? A: Potential recreational exposure via incidental ingestion and dermal contact in surface water run
Slide 50: Questions – Thank You
Questions 50 THANK YOU Additional Information (e.g., NPDES Permit, Panel Presentations, and Technical Reports): www.boeing.com/principles/environment/santa_susana MS July 25, 2018| SSFL Stormwater Expert Panel Public Meeting
Slide 51: Tour Overview
51 Tour Overview JJ
Slide 52: Stop 1 (on foot)
Stop 1 (on foot) 52 • Administration area inlet filters • Detention bioswales JJ July 25, 2018| SSFL Stormwater Expert Panel Public Meeting
Slide 53: Stop 1 (on foot)
Stop 1 (on foot) 53 • Administration area inlet filters • Detention bioswales JJ July 25, 2018| SSFL Stormwater Expert Panel Public Meeting
Slide 54: Stop 2 (from bus)
Stop 2 (from bus) 54 • Upper lot media filter • Lower lot sedimentation basin and biofilter JJ July 25, 2018| SSFL Stormwater Expert Panel Public Meeting
Slide 55: Stop 2 (from bus)
Stop 2 (from bus) 55 • Upper lot media filter • Lower lot sedimentation basin and biofilter JJ July 25, 2018| SSFL Stormwater Expert Panel Public Meeting
Slide 56: Stop 3 (exit bus)
Stop 3 (exit bus) 56 • CM-3 storm drain diversion • CM-1 storm drain diversion JJ July 25, 2018| SSFL Stormwater Expert Panel Public Meeting
Slide 57: Stop 4 (exit bus)
Stop 4 (exit bus) 57 • Outfall 018 stormwater treatment system Silvernale pond on 3/26/18 JJ July 25, 2018| SSFL Stormwater Expert Panel Public Meeting
Slide 58: Handouts for each tour stop
Handouts for each tour stop 58 JJ July 25, 2018| SSFL Stormwater Expert Panel Public Meeting