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Draft Addendum to Draft UST Data Gap Investigation Work Plan <br /> November 9, 2018 <br /> Page 4 <br /> GEOSYNTEC'S RESPONSE <br /> To assess the current concentration of TPH-d in the groundwater at the historical investigation <br /> location C-5, a boring will be drilled adjacent to this location. A grab groundwater sample will <br /> be collected at a depth of approximately 5 feet bgs. This grab groundwater sample will be <br /> analyzed for TPH-d by USEPA Method 8015B. <br /> The investigation activities described above will be conducted in accordance with protocols as <br /> described in Section 3.0 of the Draft Work Plan dated July 30, 2018 and in Section 6.3.1 of the <br /> RRI Groundwater Monitoring Work Plan dated June 1, 2018. These documents have been <br /> previously submitted to the CVRWQCB. <br /> If the additional investigation activities described above are acceptable to the CVRWQCB, <br /> please provide documentation indicating your concurrence. Once this documentation has been <br /> received,we will initiate the field investigation activities. <br /> engineers I scientists I innovators <br />