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Levand-Bright Property - 3 - 29 July 2016 <br /> 3 East 11`" Street <br /> Tracy, San Joaquin County <br /> 2. Based on historic groundwater monitoring data from the closed Panetta Property <br /> environmental case at 95 West 11'" Street, Tracy, the groundwater flow direction in the <br /> area has been variable, but was predominately towards the northeast and north. Depth <br /> discrete grab groundwater samples should be collected from the proposed borings <br /> located in the assumed down-gradient directions of the source area. The proposed <br /> deeper sample depth of 40 ft bgs for vertical delineation is acceptable. Therefore, <br /> collect a second, deeper grab groundwater sample at approximately 40 ft bgs in the two <br /> (2) borings proposed to the northeast of the former UST, the one (1) proposed boring to <br /> the east-northeast of the former UST, and the one (1) proposed boring to the northwest <br /> of the former UST. <br /> 3. Collection of a deeper sample from the boring in the former UST pit for vertical <br /> delineation is not necessary at this time. Vertical migration of pollution in groundwater is <br /> more likely to be observed in down-gradient samples, if there is a vertical component of <br /> groundwater flow downward migration will occur as the pollution migrates away from the <br /> source area. <br /> 4. Add analysis for lead and naphthalene to the list of parameters. Lead was detected at <br /> 244 milligrams per kilogram (mg/kg) in the stockpile sample collected during tank <br /> removal; this is significantly higher than typical background concentrations. Additional <br /> sampling for lead is needed. In addition, naphthalene is a common gasoline additive <br /> and should be included in the analytical suite. <br /> 5. The former UST was used to store an unknown type of fuel. Therefore, soil samples <br /> collected from the boring in the former UST pit need to also be analyzed for semi-volatile <br /> organic compounds (SVOCs). <br /> 6. Soil samples contained 1,2-dichlorobenzene, 1,2,4-trichlorobenzene, and <br /> 1,2,4-trimethylbenzene, therefore groundwater samples need to be analyzed for volatile <br /> organic compounds by EPA method 8260B. <br /> 7. A review of the State Water Resources Control Board's Geotracker website shows that <br /> the following items have not been submitted: <br /> a. Soil analytical data (EDF file) collected during UST removal. <br /> b. A Site Map (geo_map) showing the locations of all samples, as well as Site <br /> features including buildings, former and current tanks and dispensers, streets, and <br /> other relevant Site features. <br /> In Summary, Central Valley Water Board staff expect the following: <br /> • By 30 August 2016, submit UST removal data and a Site Map to Geotracker. <br /> • By 30 November 2016, submit a Site Assessment Report <br />