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PLN2013-00045;San Leandro Downtown Technology Compus/Westlake Development Partners,LLC.;1333 Martinez Street January 2014 Mitigated Negative Declaration The minimum level of protection for workers coming into direct contact with contaminated materials will be Level D: o Coveralls or similar clothing, o Reflective safety vests, o Work gloves, as necessary, o Steel-toed boots, o Safety glasses, as necessary, o Hard hat, and o Hearing protection, as necessary. • . Dust Control: Construction operations will be conducted to minimize the creation and dispersion of dust, including the following measures: • Application of water while grading, excavating, and loading, as needed; • Limiting vehicle speeds to 15 miles per hour on unpaved portions of the Sites; • Minimizing drop heights while loading/unloading soil; and, • Soil that is suspected of being contaminated will be covered by an impermeable layer. • • Additional dust control measures may be identified and implemented by contractors, as necessary,especially if dry and windy conditions persist during periods of earthwork. • Compliance with all Bay Area Air Quality Management District rules and regulations. • Vertical and Horizontal Preferential Pathways: If development plans include the construction of deep foundations, the foundation of the buildings shall incorporate measures to help reduce the potential for the downward migration of contaminated groundwater. These measures shall be identified in the site-specific geotechnical investigation reports. Appropriate measures shall be implemented to reduce vapor migration through trench backfill and utility conduits. Such measures may include placement of low-permeability backfill "plugs" at intervals on-site and where utilities extend off current parcel boundaries. • Storm Water Pollution Controls: A storm water pollution prevention plan (SWPPP) will be required to be prepared for the site. Storm water • pollution controls shall be based on best management practices(BMPs), such as those described in "Guidelines for Construction Projects"and "Erosion and Sediment Control Field Manual" published by the San Francisco Regional Water Quality Control.Board. • • Excavation De-Watering: Although not anticipated, if excavation de- • watering is required,the water will be sampled and analyzed prior to pumping to evaluate discharge alternatives. The developer's environmental consultant shall collect a sample of the water for •