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Levand-Bright Property - 3 - 29 July 2016 3 East 11th Street Tracy, San Joaquin County Based on historic groundwater monitoring data from the closed Panetta Property environmental case at 95 West 11th Street, Tracy, the groundwater flow direction in the area has been variable, but was predominately towards the northeast and north, Depth discrete grab groundwater samples should be collected from the proposed borings located in the assumed down-gradient directions of the source area. The proposed deeper sample depth of 40 ft bgs for vertical delineation is acceptable. Therefore, collect a second, deeper grab groundwater sample at approximately 40 ft bgs in the two (2) borings proposed to the northeast of the former UST, the one (1) proposed boring to the east-northeast of the former UST, and the one (1) proposed boring to the northwest of the former UST. Collection of a deeper sample from the boring in the former UST pit for vertical delineation is not necessary at this time. Vertical migration of pollution in groundwater is more likely to be observed in down-gradient samples, if there is a vertical component of groundwater flow downward migration will occur as the pollution migrates away from the source area. Add analysis for lead and naphthalene to the list of parameters. Lead was detected at 244 milligrams per kilogram (mg/kg) in the stockpile sample collected during tank removal; this is significantly higher than typical background concentrations. Additional sampling for lead is needed. In addition, naphthalene is a common gasoline additive and should be included in the analytical suite. The former UST was used to store an unknown type of fuel. Therefore, soil samples collected from the boring in the former UST pit need to also be analyzed for semi-volatile organic compounds (SVOCs). Soil samples contained 1,2-dichlorobenzene, 1,2,4-trichlorobenzene, and 1,2,4-trimethylbenzene, therefore groundwater samples need to be analyzed for volatile organic compounds by EPA method 8260B. A review of the State Water Resources Control Board's Geotracker website shows that the following items have not been submitted: Soil analytical data (EDF file) collected during UST removal. A Site Map (geo_map) showing the locations of all samples, as well as Site features including buildings, former and current tanks and dispensers, streets, and other relevant Site features. In Summary, Central Valley Water Board staff expect the following: By 30 August 2016, submit UST removal data and a Site Map to Geotracker. By 30 November 2016, submit a Site Assessment Report