3B Public Hearing 2009 0720 - Laserfiche WebLink

Home

PLN2W8-00030; Cornerstone at San Leandro Crossings March 20, 2009 Mitigated Negative Declaration In a document produced subsequent to the Phase 1 prepared by Stantec, Iris Environmental prepared a Phase II Sampling proposal. The Iris Environmental report stated the following: Stantec did not identify any recognized environmental conditions (RECs) in connection with either property but did identify long site use histories involving chemical usage. The 1333 Martinez site was used as a cannery for decades and the BART Parking Lot has, had commercial uses for long periods of time. Furthermore, the two subject sites are located in an industrial portion of San Leandro where off-site chemical releases have resulted in local groundwater contamination. Three sites illustrating off-site contamination concerns include: • The former Caterpillar facility at 800 Davis Street • Richards Automotive and Gas at 1495 Hayes Street, and • Liquid Gold Oil Corporation at 1696 Martinez Street. The Phase U subsurface investigation proposed in the Iris Environmental document is scoped to address the potential of on-site chemical releases and the potential for the subject sites to have been contaminated from chemical migration from neighboring sites. Mitigation Measure #21 Subsurface Investigations Subsurface investigations are planned for both the San Leandro Crossing East and San. Leandro Crossing West Sites prior to development. The sampling and analysis programs will be specific to each Site based on the prior uses of that Site. Additionally, a groundwater sampling and analysis program will be implemented for chemical constituents that could have migrated onto the Sites from off-site upgradient sources, if identified during due diligence. Detection limits for the analytical program will be sufficiently low to allow assessment of risks to human health under construction worker and residential exposure scenarios. If the subsurface investigation programs yield data suggesting that there could be unacceptable risks to future construction workers or residents, a California state environmental regulatory agency will be consulted to provide its opinion on the findings of the subsurface investigations and the assessment of risk. This opinion would be sought prior to initiating construction on either site. The environmental testing programs have not been completed on either of the Sites. However, there are no chemical source areas known to exist on either Site. The mitigation measures presented below are proposed as means to mitigate potential chemical exposures and associated unacceptable risks to human health should COPCs be found at the Sites at levels of concern in soil, soil gas or groundwater. Mitigation Measure #22 Pre Development Mitigation Measures If the subsurface investigation programs yield data suggesting that there could be unacceptable risks to future construction workers or residents and a California state environmental regulatory agency determines that an active remedial response is 11