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• Potentially Significant Potentially Unless Less Than Significant Mitigation Significant Impact Incorporated Impact No Impact Comments: a-d: The proposed project will not result in the routine transport, use, or disposal of hazardous materials. However, . construction activities will require the excavation and grading that will result in the disruption of the onsite soils. Numerous Environmental Site Assessments have been completed for the project sites and no Record of Environmental Contamination (RECs) have been identified. However, because of the location's historical industrial use, the potential exists for the presence of chemicals of potential concern (COPC) in the soils beneath the sites. If found,these materials could present unacceptable risks to construction workers at the site. Phase I and Phase II Environmental Site Assessments have been prepared for the project sites (by Stantec, IRIS Environmental and by SGI Environmental) to identify the potential for onsite or nearby soil or groundwater contamination. Based on a preliminary review of available aerial photographs and topographic maps, the site has been vacant since the Del Monte facility was demolished in 1989. Observations of the adjoining properties provided indications of past usage and activities. The surrounding properties are commercial and light industrial and appear to have been developed since before 1939. No pits, ponds, lagoons or waterways were observed on the adjacent . properties. Based on the observations during the reconnaissance of the property and surrounding areas, no Record of Environmental Contamination (REC) or historic REC's were identified in connection with the property. IRIS Environmental prepared a Phase II proposal subsequent to the Phase I prepared by Stantec. The IRIS Environmental proposal included a soil sample plan and a menu of mitigation measures to be utilized as necessary. The following is an excerpt from that document: °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. Furthermore, the subject site is 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 II subsurface investigation proposed in the Iris Environmental document will be completed prior to any construction activities on the site and will require the applicant 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. The San Leandro Downtown Tech Campus site has the potential presence of COPC beneath the sites that could • present unacceptable risks to construction workers and future residents of the site.IRIS Environmental has developed a soil sample plan and a menu of mitigation measures to be utilized as necessary. The"San Leandro Crossings(now the San Leandro Tech Campus) Potential Mitigation Measures for Proposed Development Projects, November 12, 2008"is attached for reference purposes.The potential Mitigation Measures will apply to all properties included in the San Leandro Tech Campus project. An Updated Remedial Action Plan (°Updated RAP") was prepared by West Environmental Services & Technology, Inc. (WEST),to update the January 2010 Remedial Action Plan(IRIS,2010)for 1333 Martinez Street in San Leandro, California ("the Site' Figure 1-1) to reflect the change in Site use from residential to commercial. Consistent with the January 2010 RAP,this Updated RAP recommends soil excavation with Land Use Covenant(LUC)to address TPH in soil and groundwater. Details of the modifications to the January 2010 RAP are provided in this report. The mitigation measures include Subsurface Investigations, Pre-Development Mitigation Measures, Risk Management Measures for Construction Phases,Pre-Construction Planning and Notification, Site-Specific Health and Safety Worker Requirements, Construction Impact Mitigation Measures, Site Control, Equipment Decontamination, Personal Protective Equipment, Dust Control, Vertical and Horizontal Preferential Pathways, Storm Water Pollution Controls, Excavation De-Watering, Additional Soil Management Protocols During Construction Activities, Procedures of Unknown Areas of Contamination,and Imported Fill. Specifically for 1696 Martinez Street, the Source Group, Inc. (SGI) prepared a Limited Subsurface Investigation Report(LSI Report) dated May 21, 2013, Including the results of the environmental investigation activities conducted on Martinez Street and Thornton Avenue in front of 1696 Martinez Street. The Site consists of an undeveloped, approximately 6,400 square foot triangular-shaped property bounded by Martinez Street to the west,Thornton Street to the south,a railroad easement and the BART tracks beyond to the east. Based on a review of investigation reports prepared for nearby sites, the interpreted groundwater flow direction in the area of the Site is to the west and southwest toward San Francisco Bay. Previous environmental assessment activities have been conducted at the Site to assess potential environmental impacts. The findings of the prior assessment did not identify significant environmental concerns.The findings of the assessment activities are included in the report 12 • •