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Hazards & Hazardous Materials (Continued)
<br />One or more VOCs were detected in all of the groundwater samples collected. Chlorinated solvents, including PCE or
<br />trichloroethylene (TCE) and associated breakdown products were detected in all samples, with the highest
<br />concentrations in the eastern and southern portion of the site. None of the chemicals detected in soil gas, soil or
<br />groundwater present restrictions -to using the site for residential development, with adherence to applicable remediation
<br />methods and mitigation measures.
<br />Mitigation Measure #20: The applicant shall utilize appropriate remediation efforts identified in the Phase I
<br />and Phase II Environmental Assessments, including removal of impacted soils and recompaction.
<br />In a document produced subsequent to the Phase 1 prepared by Stantec, Iris Environmental prepared a Phase II
<br />Sampling proposal. The Iris Environmental report stated the following:
<br />Stantec did not identify any recognized environmental conditions (RECs) in connection with either property but did
<br />identify long site use histories involving chemical usage. The 1333 Martinez site was used as a cannery for decades
<br />and the BART Parking Lot has had commercial uses for long periods of time. Furthermore, the two subject sites are
<br />located in an industrial portion of San Leandro where off-site chemical releases have resulted in local groundwater
<br />contamination. Three sites illustrating off-site contamination concerns include:
<br />• The former Caterpillar facility at 800 Davis Street
<br />• Richards Automotive and Gas at 1495 Hayes Street, and
<br />• Liquid Gold Oil Corporation at 1696 Martinez Street.
<br />The Phase II subsurface investigation proposed in the Iris Environmental document is scoped to address the potential of
<br />on-site chemical releases and the potential for the subject sites to have been contaminated from chemical migration from
<br />neighboring sites.
<br />The Cornerstone at San Leandro Crossings site has the potential presence of chemicals of potential concern (COPC)
<br />beneath the Sties which could present unacceptable risks to construction workers and future residents of the site. Iris
<br />Environmental has developed a soil sample plan and a menu of mitigation measures to be utilized as necessary. The
<br />"San Leandro Crossings Potential Mitigation Measures for Proposed Development Projects, November 12, 2008" is
<br />attached for reference purposes.
<br />The mitigation measures include Subsurface Investigations, Pre -Development Mitigation Measures, Risk Management
<br />Measures for Construction Phases, Pre -Construction Planning and Notification, Site -Specific Health and Safety Worker
<br />Requirements, Construction Impact Mitigation Measures, Site Control, Equipment Decontamination, Personal Protective
<br />Equipment, Dust Control, Vertical and Horizontal Preferential Pathways, Storm Water Pollution Controls, Excavation
<br />De -Watering, Additional Soil Management Protocols During Construction Activities, Procedures of Unknown Areas of
<br />Contamination, and Imported Fill.
<br />Mitigation Measure #21: Subsurface Investigations
<br />Subsurface investigations are planned for both the San Leandro Crossings East and San Leandro Crossings West
<br />Sites prior to development. The sampling and analysis programs will be specific to each Site based on the prior
<br />uses of that Site. Additionally, a groundwater sampling and analysis program will be implemented for chemical
<br />constituents that could have migrated onto the sites from off-site upgradient sources, if identified during due
<br />diligence. Detection limits for the analytical program will be sufficiently low to allow assessment of risks to
<br />human health under construction worker and residential exposure scenarios.
<br />Cornerstone at San Leandro Crossings Initial Study 16 March 2009
<br />POTENTIALLY
<br />ISSUES
<br />POTENTIALLY
<br />SIGNIFICANT
<br />LESS THAN
<br />NO
<br />SIGNIFICANT
<br />UNLESS
<br />SIGNIFICANT
<br />IMPACT
<br />SOURCES
<br />ISSUES
<br />MITIGATION
<br />IMPACT
<br />INCORPORATED
<br />Hazards & Hazardous Materials (Continued)
<br />One or more VOCs were detected in all of the groundwater samples collected. Chlorinated solvents, including PCE or
<br />trichloroethylene (TCE) and associated breakdown products were detected in all samples, with the highest
<br />concentrations in the eastern and southern portion of the site. None of the chemicals detected in soil gas, soil or
<br />groundwater present restrictions -to using the site for residential development, with adherence to applicable remediation
<br />methods and mitigation measures.
<br />Mitigation Measure #20: The applicant shall utilize appropriate remediation efforts identified in the Phase I
<br />and Phase II Environmental Assessments, including removal of impacted soils and recompaction.
<br />In a document produced subsequent to the Phase 1 prepared by Stantec, Iris Environmental prepared a Phase II
<br />Sampling proposal. The Iris Environmental report stated the following:
<br />Stantec did not identify any recognized environmental conditions (RECs) in connection with either property but did
<br />identify long site use histories involving chemical usage. The 1333 Martinez site was used as a cannery for decades
<br />and the BART Parking Lot has had commercial uses for long periods of time. Furthermore, the two subject sites are
<br />located in an industrial portion of San Leandro where off-site chemical releases have resulted in local groundwater
<br />contamination. Three sites illustrating off-site contamination concerns include:
<br />• The former Caterpillar facility at 800 Davis Street
<br />• Richards Automotive and Gas at 1495 Hayes Street, and
<br />• Liquid Gold Oil Corporation at 1696 Martinez Street.
<br />The Phase II subsurface investigation proposed in the Iris Environmental document is scoped to address the potential of
<br />on-site chemical releases and the potential for the subject sites to have been contaminated from chemical migration from
<br />neighboring sites.
<br />The Cornerstone at San Leandro Crossings site has the potential presence of chemicals of potential concern (COPC)
<br />beneath the Sties which could present unacceptable risks to construction workers and future residents of the site. Iris
<br />Environmental has developed a soil sample plan and a menu of mitigation measures to be utilized as necessary. The
<br />"San Leandro Crossings Potential Mitigation Measures for Proposed Development Projects, November 12, 2008" is
<br />attached for reference purposes.
<br />The mitigation measures include Subsurface Investigations, Pre -Development Mitigation Measures, Risk Management
<br />Measures for Construction Phases, Pre -Construction Planning and Notification, Site -Specific Health and Safety Worker
<br />Requirements, Construction Impact Mitigation Measures, Site Control, Equipment Decontamination, Personal Protective
<br />Equipment, Dust Control, Vertical and Horizontal Preferential Pathways, Storm Water Pollution Controls, Excavation
<br />De -Watering, Additional Soil Management Protocols During Construction Activities, Procedures of Unknown Areas of
<br />Contamination, and Imported Fill.
<br />Mitigation Measure #21: Subsurface Investigations
<br />Subsurface investigations are planned for both the San Leandro Crossings East and San Leandro Crossings West
<br />Sites prior to development. The sampling and analysis programs will be specific to each Site based on the prior
<br />uses of that Site. Additionally, a groundwater sampling and analysis program will be implemented for chemical
<br />constituents that could have migrated onto the sites from off-site upgradient sources, if identified during due
<br />diligence. Detection limits for the analytical program will be sufficiently low to allow assessment of risks to
<br />human health under construction worker and residential exposure scenarios.
<br />Cornerstone at San Leandro Crossings Initial Study 16 March 2009
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