|
Hazards & Hazardous Materials (Continued)
<br />sampling strategy will be discussed with a State environmental regulatory agency prior to the initiation of the
<br />sampling activities. Analytical results collected from the suspected source will be compared to the health -based
<br />screening levels and results discussed with a State environmental regulatory agency. If the levels are below the
<br />relevant health -based screening levels and the State environmental regulatory agency concurs, no additional
<br />action may be necessary.
<br />If the soil contains COPCs at levels that exceed the relevant health -based screening levels, or if the State
<br />regulatory agency concludes that an unacceptable risk to construction worker or future residents may be
<br />present, then management measures, such as the following, will be undertaken:
<br />■ Remove the impacted soil and dispose of off -Site;
<br />■ Install a cap to prevent contact with the contamination;
<br />■ Install a physical barrier for vapors such as a vapor barrier or passive venting system, to prevent the
<br />accumulation of vapors in indoor environment;
<br />■ Stockpile soil and aerate on -Site, or in a staging area as may be appropriate, in compliance with all
<br />applicable laws and regulations;
<br />■ Conduct in situ bioremediation measures; or
<br />■ Implement liquid or vapor extraction measures.
<br />The appropriateness of one of the above management measures over another will depend on many factors, such as the
<br />type of constituent detected, the size of the identified impacted area, and the estimated cost of implementing the
<br />remedy. Results of the sampling activities and the proposed course of action, e.g., no action necessary, soil excavation
<br />and off -Site disposal, on -Site treatment and soil reuse, shall be reported to a State environmental regulatory agency
<br />and the contractor shall obtain concurrence before implementing the remedial measures. Construction activities in
<br />the specific area where the unknown conditions were identified will resume following the completion of the additional
<br />sampling activities and the implementation of any required responses.
<br />Any cleanup or remediation shall be required to meet applicable federal, state and local laws, regulations and
<br />requirements.
<br />Imported Fill: To minimize the potential introduction of contaminated fill onto the Sites, all imported fill shall have
<br />adequate documentation so it can be verified that the fill source is appropriate for the Site's intended use.
<br />Documentation shall include detailed information on previous land use of the fill source, any Phase I Environmental
<br />Site Assessments performed and the findings, and the results of any analytical testing performed. If no documentation
<br />is available or the documentation is inadequate or if no analytical testing has been performed, samples of the potential
<br />fill material shall be collected and analyzed. The analyses selected shall be based on the fill source and knowledge of
<br />the previous land use as determined by the developer's environmental consultant. The sample frequency for potential
<br />fill material shall be in accordance with that outlined in the Department of Toxic Substances Control technical
<br />document titled, "Information Advisory on Clean Imported Fill Material". The developer's environmental consultant
<br />shall approve the use of imported fill.
<br />e -f) There are no airports or airstrips in the vicinity of the project site. Oakland International Airport is approximately 2 miles
<br />northwest of the project site and Hayward Executive Airport is approximately 4 miles to the southeast.
<br />g) The project would not alter existing emergency response procedures, nor impose a substantial demand on emergency
<br />response personnel. Accordingly, the proposed project would not impair implementation or interfere with emergency
<br />response in the project vicinity and therefore have no impact.
<br />h) The project site is in an urbanized setting, remote from wildlands. Therefore, safety hazards from wildland fires would
<br />have no impact on the proposed project. There are no new impacts beyond what was analyzed in the Downtown San
<br />Leandro TOD Strategy EIR that was certified in 2007.
<br />Cornerstone at San Leandro Crossings Initial Study 20 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 />sampling strategy will be discussed with a State environmental regulatory agency prior to the initiation of the
<br />sampling activities. Analytical results collected from the suspected source will be compared to the health -based
<br />screening levels and results discussed with a State environmental regulatory agency. If the levels are below the
<br />relevant health -based screening levels and the State environmental regulatory agency concurs, no additional
<br />action may be necessary.
<br />If the soil contains COPCs at levels that exceed the relevant health -based screening levels, or if the State
<br />regulatory agency concludes that an unacceptable risk to construction worker or future residents may be
<br />present, then management measures, such as the following, will be undertaken:
<br />■ Remove the impacted soil and dispose of off -Site;
<br />■ Install a cap to prevent contact with the contamination;
<br />■ Install a physical barrier for vapors such as a vapor barrier or passive venting system, to prevent the
<br />accumulation of vapors in indoor environment;
<br />■ Stockpile soil and aerate on -Site, or in a staging area as may be appropriate, in compliance with all
<br />applicable laws and regulations;
<br />■ Conduct in situ bioremediation measures; or
<br />■ Implement liquid or vapor extraction measures.
<br />The appropriateness of one of the above management measures over another will depend on many factors, such as the
<br />type of constituent detected, the size of the identified impacted area, and the estimated cost of implementing the
<br />remedy. Results of the sampling activities and the proposed course of action, e.g., no action necessary, soil excavation
<br />and off -Site disposal, on -Site treatment and soil reuse, shall be reported to a State environmental regulatory agency
<br />and the contractor shall obtain concurrence before implementing the remedial measures. Construction activities in
<br />the specific area where the unknown conditions were identified will resume following the completion of the additional
<br />sampling activities and the implementation of any required responses.
<br />Any cleanup or remediation shall be required to meet applicable federal, state and local laws, regulations and
<br />requirements.
<br />Imported Fill: To minimize the potential introduction of contaminated fill onto the Sites, all imported fill shall have
<br />adequate documentation so it can be verified that the fill source is appropriate for the Site's intended use.
<br />Documentation shall include detailed information on previous land use of the fill source, any Phase I Environmental
<br />Site Assessments performed and the findings, and the results of any analytical testing performed. If no documentation
<br />is available or the documentation is inadequate or if no analytical testing has been performed, samples of the potential
<br />fill material shall be collected and analyzed. The analyses selected shall be based on the fill source and knowledge of
<br />the previous land use as determined by the developer's environmental consultant. The sample frequency for potential
<br />fill material shall be in accordance with that outlined in the Department of Toxic Substances Control technical
<br />document titled, "Information Advisory on Clean Imported Fill Material". The developer's environmental consultant
<br />shall approve the use of imported fill.
<br />e -f) There are no airports or airstrips in the vicinity of the project site. Oakland International Airport is approximately 2 miles
<br />northwest of the project site and Hayward Executive Airport is approximately 4 miles to the southeast.
<br />g) The project would not alter existing emergency response procedures, nor impose a substantial demand on emergency
<br />response personnel. Accordingly, the proposed project would not impair implementation or interfere with emergency
<br />response in the project vicinity and therefore have no impact.
<br />h) The project site is in an urbanized setting, remote from wildlands. Therefore, safety hazards from wildland fires would
<br />have no impact on the proposed project. There are no new impacts beyond what was analyzed in the Downtown San
<br />Leandro TOD Strategy EIR that was certified in 2007.
<br />Cornerstone at San Leandro Crossings Initial Study 20 March 2009
<br />
|