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<br /> Total offsite stormwater area (impervious plus pervious) = 33,631 SF (0.77 AC); total offsite stormwater area required
<br />to be treated = 1,313 SF; total offsite stormwater area treatment proposed = 1,541 SF.
<br /> As discussed above in items VII(a)(ii) and (a)(iii), Geology and Soils, due to expansive soils onsite, seasonal changes
<br />in moisture content of near-surface soil and other related drainage needs should be considered in the design of at-grade
<br />improvements to avoid potential adverse effects from expansive soil shrink-swell characteristics (i.e., use of subdrain
<br />systems as appropriate to prevent subgrade soil saturation) (Rockridge, pp. 16-17, February 23, 2024).
<br /> All stormwater data and components provided by the project component applicant are subject to review, approval, and
<br />onsite inspection by the City. The project component would be subject to these standard requirements as conditions
<br />of project component approval. As a result of DTPP standards and the City requirements described above, the proposed
<br />project component would have a less than significant impact and not generate additional stormwater drainage impacts
<br />beyond those analyzed in the EIR/SEIR. This project component would be consistent with the analysis in the
<br />EIR/SEIR because it would not create new impacts or increase impacts, and there is no new information of substantial
<br />importance for CEQA purposes.
<br />b. The City of Redwood City does not currently rely on groundwater as a water supply source. Groundwater impacts
<br />were analyzed in the DTPP Final EIR and were determined to be less than significant impacts because Redwood City
<br />did not then have and had no intention of using groundwater as a water supply, so future development within the
<br />DTPP area would not have caused a depletion of groundwater supplies. Additionally, because future developments
<br />would be constructed on previously developed land, there would not be a substantial increase in impervious surfaces.
<br />The DTPP Plan-Wide Amendments SEIR concurred.
<br /> Implementation of the proposed project component would not require substantial amounts of water such that it would
<br />result in substantially depleted groundwater supplies (see item XIX[b] [water supply] of this checklist). Under the
<br />State’s Sustainable Groundwater Management Act (SGMA), medium and high priority groundwater basins are
<br />required to prepare a Groundwater Sustainability Plan (GSP). The project site is located in the San Mateo Plain
<br />Subbasin – Santa Clara Valley Basin, which according to the City of Redwood City 2020 Urban Water Management
<br />Plan has been ranked as a “very low priority” basin and is therefore not subject to the requirements of SGMA. In
<br />addition, the proposed project component would redevelop an existing structure in an already urbanized area; as
<br />discussed in item (a) above, there would be no net increase or decrease in impervious surface area. Therefore, the
<br />proposed project component would not substantially decrease groundwater supplies or interfere substantially with
<br />groundwater recharge such that the project component would impede sustainable groundwater management of the
<br />basin. Furthermore, the DTPP program EIR (p. 10-25) concluded that DTPP-facilitated development would not result
<br />in any significant groundwater impacts. The DTPP Plan-Wide Amendments program SEIR (p. 10-41) concurred with
<br />the DTPP EIR conclusion. Because the proposed project component is in compliance with all applicable DTPP
<br />standards related to water supply, hydrology, and water quality, groundwater impacts would be less than significant.
<br />This project component would be consistent with the analysis in the EIR/SEIR because it would not create new impacts
<br />or increase impacts, and there is no new information of substantial importance for CEQA purposes.
<br />c. As discussed in the DTPP program EIR (pp. 10-16 through 10-17, and 10-23 through 10-25), development facilitated
<br />by the DTPP would occur in areas of the City that are currently developed, and increases in impervious surfaces would
<br />be relatively minimal (i.e., new impervious surfaces would generally replace existing impervious surfaces and either
<br />result in a decrease in impervious surface area due to more extensive use of stormwater control measures or result in
<br />a small net increase in impervious surface area). As discussed in item (a) above and the subparts below, the DTPP,
<br />including the proposed project component, would therefore not substantially alter the existing drainage pattern of
<br />project sites, including the proposed project component site. In addition, the rate or amount of surface runoff would
<br />not be substantially increased by new development because new development would be required to comply with the
<br />City regulations regarding stormwater and stormwater management, the San Mateo Countywide Water Pollution
<br />Prevention Program, and the San Francisco Bay Region Municipal Regional Stormwater NPDES Permit (MRP).
<br /> i) As discussed in item (a), the project component would be subject to Water Board construction requirements (in
<br />particular, see NPDES MRP section “C.6. Construction Site Control”); in addition, because the project component
<br />would disturb one or more acres of land, it would be subject to the Statewide Construction General Permit (Order WQ
<br />2022-0057-DWQ; NPDES No. CAS000002). The San Francisco Bay Regional Water Quality Control Board
<br />(RWQCB, Region 2) administers the NPDES stormwater permitting program in the Bay Area, including the Municipal
<br />Regional Stormwater NPDES Permit and C.3 (stormwater compliance) Permit. Project owners submit a Notice of
<br />Intent (NOI) to the RWQCB to be covered by the General Construction Permit prior to the beginning of construction.
<br />The General Construction Permit requires the preparation and implementation of a Storm Water Pollution Prevention
<br />Plan (SWPPP), which must be prepared before construction begins, usually during the planning and design phases of
<br />a project, and must include specifications for Best Management Practices (BMPs) that would be implemented during
<br />ATTY/RESO.0074/CC RESO 847 WOODSIDE (CEQA) - EXHIBIT 1 - CEQA CONSISTENCY CHECKLIST
<br />REV: 10-23-24 VR
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