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Home My WebLink AboutNavy North Hangar Geosyntec PresentationMaln �•' �i i �y .�� h p * u f LODGE rl Navy Hangar Fire Residential Study Geosyntecl�' Results consultants PRESENTED BY Brian Hitchens, PG, CHG �� e There is no evidence that the Navy Hangar Fire resulted in increased lead or asbestos in the Study Area • There were no exceedances of State or Federal health screening criteria limits for lead or asbestos in Study Area soils. • No asbestos fibers were detected in indoor air above screening criteria in either Control or Study Areas. • No asbestos was detected in dust above State or Federal health screening criteria in either Control or Study Areas. • Out of 150 samples for lead in residential dust, one sample exceeded screening health screening criteria for lead, with no detectable lead in other samples from the same home and no detected fire related by-products. 2 it 2 3. 0 5. C01 7. Study approach and methods Lead and asbestos in California Work plan review Process for selecting homes Study results Conclusions Status of final report .M k On December 28, 2023, public health officials concluded, based on the data collected throughout the fire event, that the risk to individuals in Tustin from the hangar fire is immeasurably low. City nonetheless approved the residential study in January 2024 to go above and beyond. Geosyntec was retained based on prior experience testing homes after disasters and has performed extensive testing and analysis over the last four months. 2 Study Questions: 1. Did the Navy North Hangar fire increase lead or asbestos concentrations in soil in the surrounding residential area? 2. Did the Navy North Hangar fire increase lead or asbestos concentrations in indoor household dust in the surrounding residential area? 3. Did the Navy North Hangar fire increase the concentration of asbestos fibers in indoor air in the surrounding residential area? 4. Do lead or asbestos concentrations in soil, dust, or indoor air samples exceed state or federal health criteria? 5_,I "*- 5 Asbestos and lead are naturally occurring and prevalent in California from historical use. Asbestos: — Mined from many natural rock formations throughout California. — Used as a component in many building materials for homes built from 1930-1977. Lead: — Widespread distribution through vehicle exhaust prior to the ban on leaded gasoline in 1992. — Present in paint within many homes constructed prior to 1978. — Still present in some aviation gasoline and other commercial products. State and Federal health guidelines have been established for both lead and asbestos. 5IM" 6 Reviewed and approved by: • U.S. Environmental Protection Agency • California Department of Toxic Substances Control • South Coast Air Quality Management District • Orange County Health Care Agency • U.S. Navy DTSC health department of Toxic Substances Control .' ■ , ; ■ CARE AGENCY 7 To differentiate between pre-existing "background" and potential fire -related impacts, the study required two groups: Homes adjacent to the fire (Study Area); and • Homes unaffected by the fire (Control Areas in Santa Ana and Irvine). The number of homes included in the study was based on previous experience with how many results would be needed to provide reliable results to identify potential effects from the Hangar Incident. Study Area: A target of 50 homes was selected to provide statistically robust, representative data for the area potentially affected by the fire. Control Areas: A target of 30 representative "baseline" control samples were collected in similar homes far outside the area affected by the fire. 51M" 8 Fliers distributed through the US Postal Service database to all residences within the debris management zones created by the Orange County Fire Authority (OCFA) and to the two control areas in Santa Ana and Irvine. • Study Area: 8,526 fliers distributed • Control Areas: 6,406 fliers distributed Of the14,932 fliers mailed, 216 were returned as undeliverable (less than 1 %) E Study Area Locations ._. _. . . ¢ � ■ �� 2:\- _ . ■ fE- ; . , ■ ■ ! §�}-=E �� .--i?`■. �� .■��l� - .■. 30 volunteers were identified in Control Areas: similar homes not downwind from the Navy Hangar fire. 11 (initial) volunteers responded from the Control Areas. A door -knocking effort secured 19 volunteers. SANTA ANA CbfJTIROL AREA • RESIDENT SAMPLE LOCATIONS GONTRDLGROUPAREA OCFA INCIDENT RESPONSE DIVISION UNIT NAVY NORTH HANGAR Prevailing Wind Direction AREA � �A r • 6 samples of the ash were collected from directly within the Navy Hangar to understand potential lead and asbestos levels in ash associated with the fire. • 34 samples of building material were collected to determine what types of material in the structure may have contained asbestos. "Qnr911rnery St X JO. `r ormar MCAS-Tusti • r Ik. North flan ar r,4 Ord Hangar Ash: • No asbestos fibers found in any ash samples. • Of the 34 building -material samples asbestos only detected in roof material and floor tiles in a non -friable form (i.e., material will not crumble and release airborne asbestos fibers). • This is consistent with air monitoring from the fire that showed no respirable asbestos fibers in over 4,000 air samples collected from November 7, 2023 through April, 2024. • Lead was found at concentrations ranging from 59-1100 ppm, consistent with lead -based paint known to have been used on the structure. 13 A total of 960 soil, household dust, and airborne dust samples were collected from Study Area and Control Area residences. Twelve samples collected at each residence: • One outdoor soil sample for lead (mixed from soil from multiple locations at same site) • One outdoor soil sample for asbestos (mixed from soil from multiple locations at same site) • Two indoor air samples • Three indoor dust wipes for lead • Three indoor dust wipes for asbestos • Two indoor dust wipes for ash/soot/char 14 Ppr Lead All samples less than Three samples more than federal/state health federal/state health screening screening level (80 ppm) level (80 ppm) Average = 13 ppm Average = 28 ppm Asbestos None Detected None Detected • No asbestos detected in Study Area soils. • Lead consistent with regional urban background levels, with average concentrations lower in Study Area than Control Areas. No evidence of impacts from Navy Hangar Fire in outdoor soil 15 w Asbestos None detected above federal/state health screening level (70 structures/mm2) None detected above federal/state health screening level (70 structures/mm2) No evidence of impacts from Navy Hangar Fire in indoor air 16 Lead Of 150 lead samples, only 1 (240 samples) sample above federal/state health screening level (100 ug/ft2) Asbestos Of 150 asbestos samples, none (240 samples) detected above health screening criteria (5,000 s/cm2) Ash/Soot/ Of 100 samples, char was Char detected in 13 (13% of (160 samples) samples). Of 90 lead samples, No samples above federal/state health screening level (100 ug/ft2) Of 90 asbestos samples, none detected above health screening criteria (5,000 s/cm2) Of 60 samples, char was detected in 7 samples (12% of samples) 17 • The one Study Area sample out of 150 with lead concentrations above screening criteria was further assessed: • Two other samples from the same house had no detectable lead. • No evidence of fire byproducts in any dust samples from this residence. • No soot or ash detected in any sample. Char was detected at the same frequency in the Study and Control Areas. No evidence of impacts from Navy Hangar Fire in indoor dust W There is no evidence that the Navy Hangar Fire resulted in increased lead or asbestos in the Study Area 1. Did the Navy North Hangar fire increase lead or asbestos concentrations in soil in the surrounding residential area? • None exceeded State or Federal limits in the Study Area. 2. Did the Navy North Hangar fire increase lead or asbestos concentrations in indoor household dust in the surrounding residential area? • No asbestos was detected in dust above screening criteria in either Control or Study Areas. • One sample of 150 exceeded screening criteria for lead, with no detectable lead in other samples from the same home and no detected fire related by-products. 'IIM"M 19 3. Did the Navy North Hangar fire increase the concentration of asbestos fibers in indoor air in the surrounding residential area? • No asbestos fibers were detected in air above screening criteria in either Control or Study Areas. 4. Do lead or asbestos concentrations in soil, dust, or indoor air samples exceed state or federal health criteria? • No asbestos detected above health screening criteria in any residence. • The one dust sample in the Study Area with lead at more than the federal/state health screening level could not be associated with fire. • The three soil samples in the Santa Ana Control Area with lead at more than federal/state health screening level were consistent with regional urban background levels and could not be associated with fire. 5IM"20 1. Report Status: Full report is currently under review by the Environmental Health Unit (DTSC, South Coast AQMD, Orange County Health Care Agency, US Navy). 2. Public Download: Once finalized, report will be available for download from the North Hangar Fire Community Resource Page: www.tustinca.org 3. Individual Volunteer Reports: All 80 volunteers participating in the Study will be provided with individualized result summaries and a full copy of the laboratory analytical results for samples collected at their residence. 51M"21