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12 <br /> 5. The samples will be analyzed for VOCs including naphthalene using USEPA Method <br /> TO-15. <br /> 6. All measurements and field conditions will be recorded in the field log. <br /> 4.4.3 Groundwater Sampling <br /> As discussed above, an additional groundwater sample will be collected from Monitoring Well <br /> TW-5. The pump intake for purging and sampling will be placed in the upper 3 feet of the water <br /> table as requested by the DTSC. The groundwater sample will be analyzed for PAHs using EPA <br /> Method 8310; TPH as gasoline, diesel and motor oil using EPA Method 8015; and VOCs using <br /> EPA Method 8260. This sample will be used to assess potential benzene impact in shallow <br /> groundwater, if any. Additionally, a grab groundwater sample will be collected from Boring E3- <br /> 2 and will be analyzed for TPH using EPA Method 8015 Modified and for PAHs using EPA <br /> Method 8310. <br /> 5.0 REPORTING <br /> After this Supplemental Site Investigation is complete, the results will be reported in the RI <br /> Report to be submitted under separate cover. The RI Report will document the previous <br /> investigations conducted at the Site, the activities conducted as part of the RI and this <br /> Supplemental Site Investigation, and finally,recommendations for the path forward at this Site. <br /> 6.0 REFERENCES <br /> CDWR, 1967. San Joaquin County Groundwater Investigation Bulletin No. 146, prepared by the <br /> California Department of Water Resources in 1967. <br /> CDWR, 2003. California's Groundwater Bulletin No. 118, prepared by the California Department of <br /> Water Resources,Updated 2003. <br /> DTSC,2003. Advisory—Active Soil-Gas Investigations,prepared by DTSC,dated January 28,2003. <br /> EDR, 2007. The EDR Radius Map with GeochecO for the Tracy MGP Site,prepared by Environmental <br /> Data Resources,April 27,2007. <br /> Hotchkiss and Balding, 1971. Geology,Hydrology and Water Quality of the Tracy-Dos Palos Area, San <br /> Joaquin Valley,California,USGS Water Resource Open File Report No.72-169. <br /> New York State Department of Health,2006.Guidance for Evaluating Soil Vapor Intrusion in the State of <br /> New York,October 2006. <br /> Parsons, 2008.Remedial Investigation Workplan for the Former Tracy MGP Site in Tracy, CA,prepared <br /> by Parsons,April 21, 2008. <br /> PG&E, 1989. Site Investigation for the Former Manufactured Gas Plant Site at Tracy, California (SQ- <br /> SK-TRA),prepared by PG&E,April, 1989. <br />