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City of San Leandro <br />880 Doolittle Drive Industrial Project <br /> <br />ES-14 <br />Impact Mitigation Measure (s) Residual Impact <br />development plans at that time, the monitoring wells <br />were designated for either: <br />1. Protection in areas where minimal grade changes are <br />anticipated. These monitoring wells shall be marked <br />with paint and/or installation of delineators/snow <br />fencing/bollards. The project applicant and/or <br />General Contractor shall protect these groundwater <br />monitoring wells and maintain access to the wells for <br />routine monitoring to the extent practicable; or <br />2. Destruction in areas within the building footprint and <br />areas with substantial grade changes. <br />The DTSC shall be notified of changes to these <br />designations based on modifications to the development <br />plans and/or input from the project applicant and/or <br />General Contractor with rationale for wells that do not <br />warrant replacement. Prior to removal or installation of <br />any wells, permits shall be acquired from the Alameda <br />County Public Works Agency. <br />HAZ-5 Engineered Vapor Barrier Requirement. An <br />engineered vapor barrier shall be employed to further <br />protect against possible vapor intrusion of chemicals of <br />potential concern into the proposed building. The vapor <br />barrier shall be designed to meet the needs of the <br />building. Vapor barriers are generally constructed using <br />membranes constructed with high-density polyethylene <br />or other polyolefin-based resins. The vapor barrier shall <br />be resistant to volatile organic compounds. The vapor <br />barrier shall meet the American Society for Testing and <br />Materials guideline for a vapor barrier and have a <br />permeance rating of 0.1 perms or less. The thickness and <br />strength of the vapor barrier shall be based on the needs <br />for the building, but the architect and contractor shall use <br />a material strong enough to easily withstand the building <br />construction and other building considerations. The <br />selected vapor barrier shall be approved by the DTSC or <br />Regional Water Quality Control Board prior to installation. <br />Written approval from either the DTSC or Regional Water <br />Quality Control Board shall be provided to the City of San <br />Leandro before building permits are issued. <br />HAZ-6 Bioretention Design Coordination. The project <br />applicant shall consult with the City of San Leandro on <br />location and/or design of the on-site bioretention basins <br />to ensure protection of the groundwater basin, which may <br />include, but is not limited to, locating the basins outside <br />of the restricted areas or use of a liner in the detention <br />basin. The final design and location of the on-site <br />bioretention basins shall demonstrate that groundwater <br />would be protected from contamination. If bioretention <br />basins are proposed in the restricted areas, DTSC and/or <br />the San Francisco Bay RWQCB shall also approve the <br />design of the bioretention basins. <br />Noise and Vibration <br />Impact NOI-1. Construction and <br />operation of the proposed project <br />would generate noise, increasing <br />NOI-1 On-Site Noise Barrier. The applicant shall install a <br />permanent noise barrier along the property boundary <br />that is oriented in a northwest-southeast direction and <br />Less than <br />significant.