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City of San Leandro Alvarado Commerce Center Project <br /> 50 <br /> <br />Potentially <br />Significant <br />Impact <br />Less than <br />Significant <br />with <br />Mitigation <br />Incorporated <br />Less than <br />Significant <br />Impact No Impact <br />g. Impair implementation of or physically <br />interfere with an adopted emergency <br />response plan or emergency evacuation <br />plan? □ □ ■ □ <br />h. Expose people or structures to a <br />significant risk of loss, injury, or death <br />involving wildland fires, including where <br />wildlands are adjacent to urbanized areas <br />or where residences are intermixed with <br />wildlands? □ □ □ ■ <br />Existing Setting <br />The hazards and hazardous materials information presented in this section is based on the Phase I <br />and Limited Phase II Environmental Site Assessment (ESA) prepared by WSP dated September 29, <br />2016 (Appendix C to this Initial Study). <br />The project site was originally developed by Sherwin Williams in 1957 on vacant, undeveloped land. <br />Sherwin Williams operated as a metal can manufacturing facility from 1957 to 1983, when the <br />facility was sold to U.S. Can Company, which continued to operate as a metal can manufacturing <br />facility (WSP 2017). Previous operations conducted by Sherwin Williams and U.S. Can Company <br />included lithographing, solvent cleaning, painting, assembly, lead soldering, drum mixing, and <br />storage. Previous chemicals used and stored by Sherwin Williams and U.S. Can Company included <br />lead compounds, chromium compounds, paints, alcohols and ketones (including isopropanol and <br />methyl ethyl ketone), formaldehyde, butanol, isophorene, melamine, methyl chloride, 1, 1, 1- <br />trichloroethane (TCA), xylene, ethylbenzene, tetrachloroethylene (PCE), and petroleum <br />hydrocarbons. <br />Soil and groundwater investigations and remedial activities performed at the project site pursuant <br />to an Order issued by the Department of Toxic Substances Control (DTSC) in 1996 to the former <br />operators and current property owner resulted in the removal and reduction of hazardous <br />constituents at the subject property with the DTSC subsequently concluding that soil contamination <br />at the site was sufficiently addressed (WSP 2017). Additionally, DTSC noted that a review of <br />historical data did not confirm a significant release at the project site and that VOCs migrating onto <br />the project site were from upgradient sources associated with a regional groundwater plume, <br />known as the DWA Plume. In May 2006, DTSC notified the parties under the 1996 Order that their <br />obligations under the Order were terminated and that the existing onsite monitoring wells would <br />need to remain in order to provide DTSC with access to monitor groundwater conditions associated <br />with the regional groundwater plume. On May 16, 2017, DTSC agreed to the proper closure of four <br />of the six monitoring wells onsite (DTSC 2017). The two monitoring wells retained onsite (MW-2 and <br />MW-6) will be used by DTSC for continued monitoring of the regional DWA Plume. <br />Based on the documented groundwater contamination near the project site as a result of the DWA <br />plume, WSP recommended soil gas sampling to evaluate the potential vapor migration risks (WSP <br />347