AgdaPkt 2017-09-11 Closed and Joint SA PFA

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7.A. - Page 80 LSA ASSOCIATES, INC. ROCKETSHIP REDWOOD CITY ELEMENTARY SCHOOL PROJECT SEPTEMBER 2016 INITIAL STUDY/MITIGATED NEGATIVE DECLARATION Mitigation Measure HAZ-1: Prior to the City and County issuance of a building permit,the project sponsor shall provide to the City and County a concurrence letter from the DTSC that indicates the proposed use of the site as a school poses no unacceptable health risks to project users associated with residual subsurface contamination. The project sponsor shall continue to work with the DTSC so that any potential additional health risks to future site users from subsurface contaminants is reduced to less than 1 X 10-6(one in one million) for carcinogens and a hazard index of 1.0 for non-carcinogens,or as otherwise required by the DTSC. The project sponsor shall submit work plans to the regulatory agency for approval,prior to initiating any remedial action(s). Project construction shall not be permitted until the DTSC has determined that subsurface conditions would not likely cause adverse health effects to future users of the project site,including,as required by DTSC,ongoing monitoring of indoor VOC vapor concentrations. Construction at the project site shall be conducted under a project-specific Construction Risk Management Plan (CRMP),or equivalent document as specified by the DTSC,to protect construction workers,the general public,and the environment from subsurface hazardous materials previously identified and to address the possibility of encountering unknown contam- ination or hazards in the subsurface. The CRMP shall summarize soil and groundwater analytical data collected on the project site during past investigations,delineate areas of known soil and groundwater contamination,and identify soil and groundwater management options for excavated soil and groundwater,in compliance with local, State,and federal statutes and regulations. The CRMP shall: 1)provide procedures for evaluating,handling, storing,testing,and disposing of soil and groundwater during project excavation and dewatering activities,respectively; 2) require the preparation of a project-specific Health and Safety Plan that identifies hazardous materials present,describes required health and safety provisions and training for all workers potentially exposed to hazardous materials in accordance with State and federal worker safety regulations,and designates the personnel responsible for Health and Safety Plan implementation; 3)require the preparation of a contingency plan that shall be applied should previously unknown hazardous materials be encountered during construction activities. The contingency plan shall be developed by the contractor(s),with the approval of the DTSC,prior to grading and earthwork activities. The contingency plan shall include provisions that require collection of soil and/or groundwater samples in any newly discovered affected area by a qualified environmental professional prior to further work,as appropriate. The samples shall be submitted for laboratory analysis by a state-certified laboratory under chain-of-custody procedures. The analytical methods shall be selected by the environmental professional. The analytical results of the sampling shall be reviewed by the qualified environmental professional and submitted to the DTSC. Work shall not resume in the area(s)affected until these recommendations have been implemented under the oversight of the City or DTSC,as appropriate; and 4)designate personnel responsible for implementation of the CRMP. The CRMP shall be submitted to the City of Redwood City and County of San Mateo for review and approval prior to construction activities. P:1RWC1401B Rocketship Sch-I\PRODUCrSUS-MND1Public\Ra ketship Public Review 09-29-16.docx(09/29/16)PUBLIC REVIEW DRAFT 56 ATTY/RESO.0084/CC RESO ADOPTING CEQA-ROCKETSHIP CHARTER SCHOOL APPEAL REV:09-05-17 VR Page 64 of 124