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TA. - Page 31 <br /> LSA ASSOCIATES, INC. ROCKETSHIP REDWOOD CITY ELEMENTARY SCHOOL PROJECT <br /> SEPTEMBER 2016 INITIAL STUDY/MITIGATED NEGATIVE DECLARATION <br /> The existing structure was built in the 1950s and consists of tilt-up concrete construction with exterior <br /> concrete bearing walls and interior heavy timber columns supporting a primary timber truss roof <br /> structure with secondary joists and plywood roofing. The interior floor consists of a concrete slab on- <br /> grade foundation. <br /> The surface parking lot is entirely fenced and consists of approximately 20 vehicle parking spaces for <br /> use by existing site tenants. Vehicular access to the parking area is via two driveways that provide <br /> one-way ingress and egress to and from Bay Road. Vehicular access to the site is also provided via <br /> Charter Street at the rear of the existing building. The existing driveway consists of a 20-foot-wide <br /> access easement that is jointly used by adjacent businesses to the south and west.Parking for six <br /> vehicles for use by on-site tenants is also provided in this location. <br /> Nearly the entire site is covered in existing impervious surfaces consisting of existing buildings and <br /> pavements. Vegetation is limited to a small band of shrubs(approximately 220 square feet)between <br /> the Charter Street sidewalk and the northern building facade.No trees are located on the site. <br /> The Department of Toxic Substances Control(DTSC)has approved an Indoor Air Sampling <br /> Mitigation Work Plan(Work Plan)',2 to mitigate vapor intrusion of volatile organic compounds <br /> (VOCs)present within groundwater beneath the site. The existing property owner has installed a soil <br /> vapor recovery system(also referred to as a passive sub-slab3 depressurization system,further <br /> described below)designed to interrupt the potential exposure pathway of volatilization of contami- <br /> nants to indoor air. The Work Plan also includes a monitoring and reporting component that will be <br /> overseen by DTSC to ensure the effectiveness of the system. The existing property owner,project <br /> sponsor,and DTSC recently developed a Work Plan to test the effectiveness of the system. Refer to <br /> Section B.7 of this chapter and Section VIII,Hazards and Hazardous Materials of the Initial Study for <br /> additional information. <br /> 3. Existing General Plan and Zoning <br /> As shown in Figure 5,the project site is currently designated Industrial—Light on the Redwood City <br /> General Plan Land Use Policy Map. As shown in Figure 6,the southern portion of the project site is <br /> zoned IR(Industrial Restricted)on the Redwood City Zoning Map and the northern portion of the site <br /> is designated M-1 (Light Industrial)on the San Mateo County Zoning Map. <br /> 4. Surrounding Land Uses <br /> The project site is located in a developed area and is surrounded primarily by light industrial and <br /> commercial uses within unincorporated San Mateo County.As shown in Figure 3,light industrial and <br /> commercial uses surround the site on all sides. Specifically,businesses in the area immediately to the <br /> east, south,and west of the site generally consist of small to medium-sized auto body and fabrication <br /> 1 The Source Group,2016.Indoor Air Sampling Mitigation Work Plan,Former Commercial Property, 860 Charter <br /> Street,Redwood City, California.June 27. <br /> 2 Department of Toxic Substances Control,2016.Approval of the Indoor Air Sampling and Mitigation Work Plan, <br /> Rocketship Charter School,KS Mattson Property,860 Charter Street,Redwood City,San Mateo County(Project Code <br /> 204277).June 28. <br /> 3"Sub-slab"refers to the area below the concrete floor of the building. <br /> P:1RWC1401B Rocketship Sch-I\PRODUCrSUS-MND1Public\Ra ketship Public Review 09-29-16.docx(09/29/16)PUBLIC REVIEW DRAFT 7 <br /> ATTY/RESO.0084/CC RESO ADOPTING CEQA-ROCKETSHIP CHARTER SCHOOL APPEAL <br /> REV:09-05-17 VR Page 15 of 124 <br />