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City of San Leandro Alvarado Commerce Center Project <br /> 38 <br />b. Would the project result in substantial soil erosion or the loss of topsoil? <br />Construction of the project would require earthwork activities during the demolition of existing <br />onsite buildings and the construction of the development. As the project would disturb over one <br />acre of land, the applicant would be required to obtain coverage under the General Permit for <br />Discharges of Storm Water Associated with Construction Activity (Construction General Permit <br />Order 2009-0009-DWQ or 2009-0009-DWQ General Permit) to comply with CWA National Pollutant <br />Discharge Elimination System (NPDES) requirements. Compliance with these requirements would <br />include preparation of a Storm Water Pollution Prevention Plan (SWPPP), which would specify Best <br />Management Practices (BMP) to quickly contain and clean up any accidental spills or leaks. In <br />accordance with SLMC Section 7-12-230, the project applicant is required to prepare and implement <br />an erosion and sedimentation control plan and a drainage plan. The plans would be required to <br />include interim erosion and sedimentation control measures (such as containment structures or <br />control devices) to be taken during wet seasons until permanent erosion and sedimentation control <br />measures can adequately minimize erosion, excessive stormwater runoff, and sedimentation <br />(containment structures, overhead coverage, control devices). With required implementation of <br />these plans and BMPs, substantial erosion or the loss of top soil would not occur at the project site. <br />Impacts would be less than significant. <br />LESS THAN SIGNIFICANT IMPACT <br />d. Would the project be located on expansive soil, as defined in Table 1-B of the Uniform Building <br />Code (1994), creating substantial risks to life or property? <br />The Geotechnical Report found the project site to have moderately expansive soil in the surficial <br />soils that blanket the site (Cornerstone 2016). Expansive soils can undergo significant volume <br />change with changes in moisture content. They shrink and harden when dried and expand and <br />soften when wetted. Therefore, the onsite expansive soils may create a risk to life or property. This <br />impact is potentially significant. However, Mitigation Measure GEO-1 includes geotechnical <br />considerations that would reduce risks associated with expansive soils. Therefore, implementation <br />of Mitigation Measure GEO-1 would reduce the potentially significant impact associated with <br />expansive soils to a less than significant level. <br />LESS THAN SIGNIFICANT WITH MITIGATION INCORPORATED <br />e. Would the project have soils incapable of adequately supporting the use of septic tanks or <br />alternative wastewater disposal systems where sewers are not available for the disposal of <br />wastewater? <br />The project would not include components that would require the use of septic tanks. The project <br />site and facilities are already connected to the City of San Leandro’s municipal sewer system, as <br />would be the project. There would be no impact. <br />NO IMPACT <br />335