16 SP-2026-0048C.CP - W. Martin Luther King Jr. Boulevard & Nueces Street; District 9 - Public Comment 3 — original pdf
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16 SP-2026-0048C.CP - W. Martin Luther King Jr. Boulevard & Nueces Street; District 91 of 9 16 SP-2026-0048C.CP - W. Martin Luther King Jr. Boulevard & Nueces Street; District 92 of 9 Environmental Risks Jack Brown Cleaners Redevelopment Presented by Brad Snow, P.E., P.G. - Snow Environmental Solutions, LLC For Neighbors in Judge’s Hill Neighborhood 1 16 SP-2026-0048C.CP - W. Martin Luther King Jr. Boulevard & Nueces Street; District 93 of 9 Introduction Brad Snow, P.E., P.G. Self-employed environmental consultant with 44 years experience evaluating contaminated soil, groundwater, and surface water sites Working with three interested neighbors Assignment: evaluate potential environmental risks associated with redevelopment of the Jack Brown Cleaners site at 615 W. MLK, Jr., Austin Focus on possible migration of dry cleaning chemical vapors from underlying soil and groundwater into current and future building (Vapor Intrusion) Brad Snow presentation to City of Austin Planning Commission 3/10/2026 2 16 SP-2026-0048C.CP - W. Martin Luther King Jr. Boulevard & Nueces Street; District 94 of 9 Groundwater is Contaminated with Dry Cleaner Chemicals Concentrations Pose Human Health Risk via Inhalation of Indoor Air Brad Snow presentation to City of Austin Planning Commission 3/10/2026 3 Well No.Sample DateConcentration, µg/L (ppb)Resident VISL, µg/LMax. Conc./VISLTetrachloroethene (PCE) MW-109/29/201731,500152,100 timesTrichloroethene (TCE) MW-109/29/20171,69011,690 timesVinyl Chloride (VC)MW-105/4/201759.20∞ timesWell No.Sample DateConcentration, µg/L (ppb)Resident VISL, µg/LMax. Conc./VISLTetrachloroethene (PCE) MW-106/29/20197,26015484 timesTrichloroethene (TCE) MW-106/29/20194061406 timesVinyl Chloride (VC)MW-66/29/2019520∞ timesMAXIMUM CONCENTRATIONSCHEMICALS OF CONCERN (COCs)VAPOR INTRUSION SCREENING LEVELSMAXIMUM GROUNDWATER CONCENTRATIONS vs. VAPOR INTRUSION SCREENING LEVELSRECENT HIGH GROUNDWATER CONCENTRATIONS vs. VAPOR INTRUSION SCREENING LEVELSCHEMICALS OF CONCERN (COCs)MAXIMUM CONCENTRATIONSVAPOR INTRUSION SCREENING LEVELS16 SP-2026-0048C.CP - W. Martin Luther King Jr. Boulevard & Nueces Street; District 95 of 9 Recent Groundwater Data (2019-2020) VISL Exceedances Brad Snow presentation to City of Austin Planning Commission 3/10/2026 4 16 SP-2026-0048C.CP - W. Martin Luther King Jr. Boulevard & Nueces Street; District 96 of 9 Conclusions and Recommendations Dry Cleaner Chemicals (PCE, TCE and VC) groundwater concentrations greatly exceed US EPA Vapor Intrusion Screening Levels by up to 2,100 times Potential human health cancer risk of vapor intrusion into current and future buildings Recommendations 1. Owner/Developer evaluate vapor intrusion risk by collecting site soil gas data, and/or 2. Install vapor barrier to prevent migration into future buildings; and 3. Apply an environmental restrictive covenant (ERC) on the property deed to: a) Inform future owners of site conditions, and b) Require vapor mitigation measures, as needed, to protect human health. 4. Request City to sign ERC to enforce the above provisions Brad Snow presentation to City of Austin Planning Commission 3/10/2026 5 16 SP-2026-0048C.CP - W. Martin Luther King Jr. Boulevard & Nueces Street; District 97 of 9 Questions? Contact Brad Snow, P.E., P.G. Snow Environmental Solutions, LLC Austin, Texas (512) 705-0010 brad@snowenv.com Brad Snow presentation to City of Austin Planning Commission 3/10/2026 6 16 SP-2026-0048C.CP - W. Martin Luther King Jr. Boulevard & Nueces Street; District 98 of 9 16 SP-2026-0048C.CP - W. Martin Luther King Jr. Boulevard & Nueces Street; District 99 of 9