AgdaPkt 2017-09-11 Closed and Joint SA PFA

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TA. - Page 87 LSA ASSOCIATES, INC. ROCKETSHIP REDWOOD CITY ELEMENTARY SCHOOL PROJECT SEPTEMBER 2016 INITIAL STUDY/MITIGATED NEGATIVE DECLARATION 1. An inventory and accounting of existing and proposed impervious areas. 2. Low Impact Development(LID)design details incorporated into the project. The top tier of LID treatment shall be used,unless shown to be infeasible through the methodology presented in the San Mateo Countywide Water Pollution Prevention Program C.3 Stormwater Technical Guidance Manual. The top tier of LID treatment consists of approaches that retain stormwater on the site by means of evapotranspiration,infiltration, and rainwater harvesting and reuse,instead of releasing treated water to the stormwater drainage system. If the top tier of LID treatment is shown to be infeasible,then the project shall use biotreatment measures,which are considered second tier LID treatment. Biotreatment measures are designed to filter stormwater through soil and then release the treated water to the stormwater drainage system. 3. Measures to address potential stormwater contaminants. These may include measures to cover or control potential sources of stormwater pollutants at the project site. 4. A Stormwater Facility Operation and Maintenance Plan for the project site,which will include periodic inspection and maintenance of the storm drainage system. Persons responsible for performing and funding the requirements of this plan shall be identified. These measures are incorporated into the City's standard conditions of approval and compliance with these measures would ensure that this impact is less than significant. b) Substantially deplete groundwater supplies or interfere substantially with groundwater recharge such that there would be a net deficit in aquifer volume or a lowering of the local groundwater table level(e.g., the production rate of pre-existing nearby wells would drop to a level which would not support existing land uses or planned uses for which permits have been granted)? (Less-Than-Significant Impact) The proposed project would not increase the impervious surface area of the project site and therefore does not have the potential to interfere with groundwater recharge.Furthermore,the project site is located in an urban area where the majority of stormwater runoff drains to culverts rather than infiltrating into the groundwater aquifer.78°79 Consequently,the project site is not located in an area that substantially contributes to the recharge of the underlying groundwater aquifer. Therefore,the proposed project would not interfere with groundwater recharge. The proposed project would connect to the Redwood City Water Department water service system 80 and would not use groundwater at the site.Although no use of groundwater is proposed as part of the project, some dewatering may be required during construction.However,these activities would focus on the uppermost shallow groundwater(less than 20 feet below the ground surface),which is not used as a drinking water source (and,as discussed in Section VIII,Hazards and Hazardous Materials,may 78 Oakland Museum of California,2004.Creek&Watershed Map of Palo Alto&Vicinity.Website:www.museumea.org/ creeks/GIS/index.html. 79 San Mateo,County of,2010.North Fair Oaks Community Plan Update,Appendix A—Existing Conditions; Drawing Number SD-1:Existing Storm Drain System.Website:planning.smegov.org/documents/nfo-plan. 80 San Mateo,County of,2010.North Fair Oaks Community Plan Update,Appendix A—Existing Conditions; Drawing Number W-1: Water Service Areas.Website:planning smc oe v.ore/documents/nfo-plan. P:1RWC1401B Rocketship Sch-I\PRODUCrSUS-MNDT&Iic\R-ketship Public Review 09-29-16.docx(09/29/16)PUBLIC REVIEW DRAFT 63 ATTY/RESO.0084/CC RESO ADOPTING CEQA-ROCKETSHIP CHARTER SCHOOL APPEAL REV:09-05-17 VR Page 71 of 124