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Geosyntec'' <br /> consultants <br /> (ERS, 2008b);therefore,the potential presence of naphthalene in the soil from 0 to 5 feet <br /> bgs could not be evaluated. Naphthalene will be analyzed to fill the data gap. <br /> To assess the current concentration of TPHd in groundwater, a grab groundwater sample <br /> will be collected at a depth of approximately 6 feet bgs and analyzed for TPHd. <br /> 2. PROPOSED SCOPE <br /> The proposed investigation scope of work will include the following elements (Table 1): <br /> • Subsurface soil samples will be collected adjacent to the historical boring <br /> locations with the highest contaminant detections in the respective UST areas, at <br /> the 0- to 5-foot-bgs depth; <br /> • A grab groundwater sample will be collected adjacent to UST 916B; <br /> • Samples from each location will be submitted for laboratory analyses to <br /> TestAmerica Laboratories, Pleasanton, California, a California-certified <br /> laboratory: <br /> o At UST 517, one soil sample will be analyzed for naphthalene, MTBE, <br /> TPHg, and TPHd; <br /> o At UST 605, one soil sample will be analyzed for naphthalene; <br /> o At UST 81713,two soil samples will be analyzed for benzene,naphthalene, <br /> TPHg, and TPHd, and three soil samples will be analyzed for TPHg, <br /> benzene, toluene, ethylbenzene, and xylenes; and <br /> o At UST 916B, one soil sample will be analyzed for naphthalene, TPHg, <br /> and TPHd and one grab groundwater sample will be analyzed for TPHd. <br /> Target locations, sampling depths, and target analytes are summarized in Table 1. <br /> The remainder of this Work Plan describes the scope of work for implementing the above <br /> activities. <br /> 20190122- FINAL UST Data Gap Work Plan 5 22.01.2019 <br />