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Wells Fargo Bank Property PRIVILEGED & CONFIDENTIAL <br /> 49 South Wilson Way <br /> Stockton, California <br /> October 9, 1998 <br /> Page 2 <br /> • TPH-g and benzene, toluene, ethylbenzene and xylenes (BTEX) were not reported <br /> in groundwater samples collected from monitoring wells MW-I or MW-3; <br /> • TPH-g was reported in the groundwater samples collected from MW-2 and MW-4 <br />' at concentrations of up to 3.4 parts per million (ppm); <br /> • TPH (Carbon Range CS-C44+) was also reported in the groundwater sample <br /> collected from MW-2,at a concentration of 2.3 ppm; <br /> 0 Benzene was reported in the groundwater samples collected from MW-2 and MW- <br /> 4, at concentrations of 1.2 ppm and 1 I ppm, respectively; <br /> 0 Methyl-tert-butyl ether(MTBE) and other fuel oxygenates were not reported in the <br /> soil or groundwater samples collected; and <br /> • A review of a historical photograph of the site, historical Sanborn Fire Insurance <br /> Maps, and the current concentrations of TPH-g and benzene indicates that the most <br /> probable locations of the former underground storage tanks (USTs) were east of the <br /> former pump island, near the corner of East Market Street and South Wilson Way, <br /> which is beneath the current bank building. <br /> Building Analytics recommends that this report be submitted to the San Joaquin County <br /> Public Health Services, Environmental Health Division for their review and response, and <br /> that quarterly groundwater monitoring be continued to assess changes in groundwater <br /> conditions (i.e., flow direction, gradient and contaminant concentrations) and plume <br /> stability. <br /> If you have any questions regarding this report, please contact us at (S 18) 544-1898. <br /> 1 Respectfully submitted, <br /> BUILDING ANAL TI <br /> rJop ontoya, R.G., C.E.G. <br /> Mana or, Environmental Services <br /> r <br />