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Quik Stop Station No 079 June 20, 2002 <br /> ` Turlock, California _ Results of Additional Groundwater Assessment <br /> • The 25, 60 and 65-foot soil samples and the hydropunch groundwater samples were analyzed <br /> for TPHg, BTEX, and the five fuel oxygenates MTBE, dusopropyl ether (DIPE), ethyl-t- <br /> butyl ether (ETBE), tert-amyl methyl ether (TAME), and tert-butanol (TBA) by EPA <br /> Method 8260B <br /> RESULTS OF SOIL AND GROUNDWATER INVESTIGATION <br /> Soils encountered to 65 feet bsg consisted primarily of brown to gray silt with variable <br /> fractions of gravel, sand and clay, with minor interbedded, brown to reddish brown silty sand <br /> with variable fractions of gravel as shown on the boring logs Groundwater was encountered <br /> at approximately 64 feet bsg m the soil borings <br /> Soil and hydropunch groundwater analytical results are summarized in Table 1 Analytical <br /> reports and chain-of custody documents are contained in Appendix E <br /> No TPHg, BTEX or oxygenate compounds were reported in the soil samples collected from <br /> the three soil borings /No TPHg, BTEX compounds or MTBE were reported in the <br /> composite soil stockpile sample �'A totaI lead concentration of 5 17 milligrams per kilogram <br /> (parts per million or ppm) was reported in the soil stockpile sample <br /> 9x ��1g1o3 <br /> Concentrations of TPHg ranging from 6 to 660 micrograms per liter (parts per billion or <br /> ppb), ethylbenzene ranging from 5 0 to 20 ppb and total xylenes ranging from 29 to 110 ppb <br /> were reported in the three groundwater samples A concentration of 0 63 ppb MTBE was <br /> reported in the SB-1 groundwater sample — <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> Analytical results of soil samples indicate that soil petroleum hydrocarbon impacts do not <br /> extend out from the dispenser and former UST locations to the soil boring SB-1 through SB- <br /> 079rpt6-02 <br /> Project No 7079 13 HORIZON ENVIRONMENTAL <br />