Reso PC17-07 0032 PC Reso Approving CEQA - 860 Charter St

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LSA ASSOCIATES, INC. SEPTEMBER 2016 ROCKETSHIP REDWOOD CITY ELEMENTARY SCHOOL PROJECT INITIAL STUDY/ MITIGATED NEGATIVE DECLARATION P:\RWC1401B Rocketship School\PRODUCTS\IS-MND\Public\Rocketship Public Review 09-29-16.docx (09/29/16) PUBLIC REVIEW DRAFT 7 The existing structure was built in the 1950s and consists of tilt-up concrete construction with exterior concrete bearing walls and interior heavy timber columns supporting a primary timber truss roof structure with secondary joists and plywood roofing. The interior floor consists of a concrete slab on- grade foundation. The surface parking lot is entirely fenced and consists of approximately 20 vehicle parking spaces for use by existing site tenants. Vehicular access to the parking area is via two driveways that provide one-way ingress and egress to and from Bay Road. Vehicular access to the site is also provided via Charter Street at the rear of the existing building. The existing driveway consists of a 20-foot-wide access easement that is jointly used by adjacent businesses to the south and west. Parking for six vehicles for use by on-site tenants is also provided in this location. Nearly the entire site is covered in existing impervious surfaces consisting of existing buildings and pavements. Vegetation is limited to a small band of shrubs (approximately 220 square feet) between the Charter Street sidewalk and the northern building façade. No trees are located on the site. The Department of Toxic Substances Control (DTSC) has approved an Indoor Air Sampling Mitigation Work Plan (Work Plan)1, 2 to mitigate vapor intrusion of volatile organic compounds (VOCs) present within groundwater beneath the site. The existing property owner has installed a soil vapor recovery system (also referred to as a passive sub-slab3 depressurization system, further described below) designed to interrupt the potential exposure pathway of volatilization of contami- nants to indoor air. The Work Plan also includes a monitoring and reporting component that will be overseen by DTSC to ensure the effectiveness of the system. The existing property owner, project sponsor, and DTSC recently developed a Work Plan to test the effectiveness of the system. Refer to Section B.7 of this chapter and Section VIII, Hazards and Hazardous Materials of the Initial Study for additional information. 3. Existing General Plan and Zoning As shown in Figure 5, the project site is currently designated Industrial – Light on the Redwood City General Plan Land Use Policy Map. As shown in Figure 6, the southern portion of the project site is zoned IR (Industrial Restricted) on the Redwood City Zoning Map and the northern portion of the site is designated M-1 (Light Industrial) on the San Mateo County Zoning Map. 4. Surrounding Land Uses The project site is located in a developed area and is surrounded primarily by light industrial and commercial uses within unincorporated San Mateo County. As shown in Figure 3, light industrial and commercial uses surround the site on all sides. Specifically, businesses in the area immediately to the east, south, and west of the site generally consist of small to medium-sized auto body and fabrication 1 The Source Group, 2016. Indoor Air Sampling Mitigation Work Plan, Former Commercial Property, 860 Charter Street, Redwood City, California. June 27. 2 Department of Toxic Substances Control, 2016. Approval of the Indoor Air Sampling and Mitigation Work Plan, Rocketship Charter School, KS Mattson Property, 860 Charter Street, Redwood City, San Mateo County (Project Code 204277). June 28. 3 “Sub-slab” refers to the area below the concrete floor of the building. ATTY/RESO.0032/PC RESO APPROVING CEQA - 860 CHARTER ST. EXHIBIT A REV: 06-15-17 PR Page 15 of 124