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Morita Brothers Service Station 9 July lb, 1992 <br /> ' TH-2 The other two samples which detected the presence of total xylenes, detected <br /> total xylenes at a concentration of less than 002 mg/kg <br /> Total lead was detected at a concentration of 20 mgIkg at a depth of 30 feet in boring <br /> TH-2, and 19 mg/kg at depths of 25 and 35 feet in boring TH-1 and at a depth of 20 feet <br /> in boring TH-2 These samples were also analyzed for soluble lead and none was <br /> detected <br /> Regional Water Quality Control Board recommended guidelines for gasoline, and the <br />' gasoline constituent volatile aromatics, benzene, toluene, ethylbenzene, and total <br /> xylenes have been calculated using the LUFT methodology by multiplying the most <br /> stringent current federal or state water quality standards by a factor of 100 to <br />' account for attenuation due to site-specific parameters including vertical separation <br /> to ground water, soil lithology, fractures in subsurfaces, annual average <br /> precipitation, and any direct conduits to ground water The recommended guidelines <br /> are 10 mg/kg for TPH as gasoline, 0 3 mg/kg for benzene, 0 3 mg/kg for toluene, 10 <br /> mg/kg for ethylbenzene, and 1 0 mg/kg for total xylenes <br />' Laboratory analytical results for the thirty selected soil samples from the seven <br /> borings are summarized to Table 3 - Summary of Analytical Results Copies of the <br /> analytical reports and chain of custody documentation are presented in Appendix B - <br /> Laboratory Analytical Results <br /> 1 <br /> E13-8101-3 9207-EO37 WP <br />